kopia lustrzana https://github.com/pimoroni/pimoroni-pico
3385 wiersze
129 KiB
C++
3385 wiersze
129 KiB
C++
//
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// JPEG Decoder
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//
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// written by Larry Bank
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// bitbank@pobox.com
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// Arduino port started 8/2/2020
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// Original JPEG code written 26+ years ago :)
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// The goal of this code is to decode baseline JPEG images
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// using no more than 18K of RAM (if sent directly to an LCD display)
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//
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// Copyright 2020 BitBank Software, Inc. All Rights Reserved.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===========================================================================
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//
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#include "JPEGDEC.h"
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#if defined(ARM_MATH_CM4) || defined(ARM_MATH_CM7)
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#define HAS_SIMD
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#endif
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// forward references
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static int JPEGInit(JPEGIMAGE *pJPEG);
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static int JPEGParseInfo(JPEGIMAGE *pPage, int bExtractThumb);
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static void JPEGGetMoreData(JPEGIMAGE *pPage);
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static int DecodeJPEG(JPEGIMAGE *pImage);
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static int32_t readRAM(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen);
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static int32_t seekMem(JPEGFILE *pFile, int32_t iPosition);
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#if defined (__MACH__) || defined( __LINUX__ ) || defined( __MCUXPRESSO )
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static int32_t readFile(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen);
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static int32_t seekFile(JPEGFILE *pFile, int32_t iPosition);
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static void closeFile(void *handle);
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#endif
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static void JPEGDither(JPEGIMAGE *pJPEG, int iWidth, int iHeight);
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/* JPEG tables */
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// zigzag ordering of DCT coefficients
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static const unsigned char cZigZag[64] = {0,1,5,6,14,15,27,28,
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2,4,7,13,16,26,29,42,
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3,8,12,17,25,30,41,43,
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9,11,18,24,31,40,44,53,
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10,19,23,32,39,45,52,54,
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20,22,33,38,46,51,55,60,
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21,34,37,47,50,56,59,61,
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35,36,48,49,57,58,62,63};
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// un-zigzag ordering
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static const unsigned char cZigZag2[64] = {0,1,8,16,9,2,3,10,
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17,24,32,25,18,11,4,5,
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12,19,26,33,40,48,41,34,
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27,20,13,6,7,14,21,28,
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35,42,49,56,57,50,43,36,
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29,22,15,23,30,37,44,51,
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58,59,52,45,38,31,39,46,
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53,60,61,54,47,55,62,63};
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// For AA&N IDCT method, multipliers are equal to quantization
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// coefficients scaled by scalefactor[row]*scalefactor[col], where
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// scalefactor[0] = 1
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// scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
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// For integer operation, the multiplier table is to be scaled by
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// IFAST_SCALE_BITS.
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static const int iScaleBits[64] = {16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
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22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
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21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
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19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
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16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
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12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
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8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
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4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247};
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//
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// Range clip and shift for RGB565 output
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// input value is 0 to 255, then another 256 for overflow to FF, then 512 more for negative values wrapping around
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// Trims a few instructions off the final output stage
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//
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static const uint8_t ucRangeTable[] = {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
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0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
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0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
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0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,
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0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,
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0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,
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0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
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0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
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0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
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0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
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0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
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0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
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0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
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0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
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0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f};
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//
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// Convert 8-bit grayscale into RGB565
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//
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static const uint16_t usGrayTo565[] = {0x0000,0x0000,0x0000,0x0000,0x0020,0x0020,0x0020,0x0020, // 0
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0x0841,0x0841,0x0841,0x0841,0x0861,0x0861,0x0861,0x0861,
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0x1082,0x1082,0x1082,0x1082,0x10a2,0x10a2,0x10a2,0x10a2,
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0x18c3,0x18c3,0x18c3,0x18c3,0x18e3,0x18e3,0x18e3,0x18e3,
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0x2104,0x2104,0x2104,0x2104,0x2124,0x2124,0x2124,0x2124,
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0x2945,0x2945,0x2945,0x2945,0x2965,0x2965,0x2965,0x2965,
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0x3186,0x3186,0x3186,0x3186,0x31a6,0x31a6,0x31a6,0x31a6,
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0x39c7,0x39c7,0x39c7,0x39c7,0x39e7,0x39e7,0x39e7,0x39e7,
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0x4208,0x4208,0x4208,0x4208,0x4228,0x4228,0x4228,0x4228,
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0x4a49,0x4a49,0x4a49,0x4a49,0x4a69,0x4a69,0x4a69,0x4a69,
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0x528a,0x528a,0x528a,0x528a,0x52aa,0x52aa,0x52aa,0x52aa,
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0x5acb,0x5acb,0x5acb,0x5acb,0x5aeb,0x5aeb,0x5aeb,0x5aeb,
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0x630c,0x630c,0x630c,0x630c,0x632c,0x632c,0x632c,0x632c,
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0x6b4d,0x6b4d,0x6b4d,0x6b4d,0x6b6d,0x6b6d,0x6b6d,0x6b6d,
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0x738e,0x738e,0x738e,0x738e,0x73ae,0x73ae,0x73ae,0x73ae,
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0x7bcf,0x7bcf,0x7bcf,0x7bcf,0x7bef,0x7bef,0x7bef,0x7bef,
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0x8410,0x8410,0x8410,0x8410,0x8430,0x8430,0x8430,0x8430,
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0x8c51,0x8c51,0x8c51,0x8c51,0x8c71,0x8c71,0x8c71,0x8c71,
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0x9492,0x9492,0x9492,0x9492,0x94b2,0x94b2,0x94b2,0x94b2,
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0x9cd3,0x9cd3,0x9cd3,0x9cd3,0x9cf3,0x9cf3,0x9cf3,0x9cf3,
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0xa514,0xa514,0xa514,0xa514,0xa534,0xa534,0xa534,0xa534,
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0xad55,0xad55,0xad55,0xad55,0xad75,0xad75,0xad75,0xad75,
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0xb596,0xb596,0xb596,0xb596,0xb5b6,0xb5b6,0xb5b6,0xb5b6,
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0xbdd7,0xbdd7,0xbdd7,0xbdd7,0xbdf7,0xbdf7,0xbdf7,0xbdf7,
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0xc618,0xc618,0xc618,0xc618,0xc638,0xc638,0xc638,0xc638,
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0xce59,0xce59,0xce59,0xce59,0xce79,0xce79,0xce79,0xce79,
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0xd69a,0xd69a,0xd69a,0xd69a,0xd6ba,0xd6ba,0xd6ba,0xd6ba,
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0xdedb,0xdedb,0xdedb,0xdedb,0xdefb,0xdefb,0xdefb,0xdefb,
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0xe71c,0xe71c,0xe71c,0xe71c,0xe73c,0xe73c,0xe73c,0xe73c,
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0xef5d,0xef5d,0xef5d,0xef5d,0xef7d,0xef7d,0xef7d,0xef7d,
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0xf79e,0xf79e,0xf79e,0xf79e,0xf7be,0xf7be,0xf7be,0xf7be,
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0xffdf,0xffdf,0xffdf,0xffdf,0xffff,0xffff,0xffff,0xffff};
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//
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// Clip and convert red value into 5-bits for RGB565
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//
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static const uint16_t usRangeTableR[] = {0x0000, // 0
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0x0800,
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0x1000,
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0x1800,
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0x2000,
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0x2800,
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0x3000,
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0x3800,
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0x4000,
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0x4800,
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0x5000,
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0x5800,
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0x6000,
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0x6800,
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0x7000,
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0x7800,
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0x8000,
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0x8800,
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0x9000,
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0x9800,
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0xa000,
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0xa800,
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0xb000,
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0xb800,
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0xc000,
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0xc800,
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0xd000,
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0xd800,
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0xe000,
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|
0xe800,
|
|
0xf000,
|
|
0xf800,
|
|
0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800, // 32
|
|
0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,
|
|
0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,
|
|
0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,0xf800,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 64
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 96
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
|
|
//
|
|
// Clip and convert green value into 6-bits for RGB565
|
|
//
|
|
static const uint16_t usRangeTableG[] = {0x0000,0x0020, // 0
|
|
0x0040,0x0060,
|
|
0x0080,0x00a0,
|
|
0x00c0,0x00e0,
|
|
0x0100,0x0120,
|
|
0x0140,0x0160,
|
|
0x0180,0x01a0,
|
|
0x01c0,0x01e0,
|
|
0x0200,0x0220,
|
|
0x0240,0x0260,
|
|
0x0280,0x02a0,
|
|
0x02c0,0x02e0,
|
|
0x0300,0x0320,
|
|
0x0340,0x0360,
|
|
0x0380,0x03a0,
|
|
0x03c0,0x03e0,
|
|
0x0400,0x0420,
|
|
0x0440,0x0460,
|
|
0x0480,0x04a0,
|
|
0x04c0,0x04e0,
|
|
0x0500,0x0520,
|
|
0x0540,0x0560,
|
|
0x0580,0x05a0,
|
|
0x05c0,0x05e0,
|
|
0x0600,0x0620,
|
|
0x0640,0x0660,
|
|
0x0680,0x06a0,
|
|
0x06c0,0x06e0,
|
|
0x0700,0x0720,
|
|
0x0740,0x0760,
|
|
0x0780,0x07a0,
|
|
0x07c0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0, // 64
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,0x07e0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 128
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 196
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
|
|
//
|
|
// Clip and convert blue value into 5-bits for RGB565
|
|
//
|
|
static const uint16_t usRangeTableB[] = {0x0000, // 0
|
|
0x0001,
|
|
0x0002,
|
|
0x0003,
|
|
0x0004,
|
|
0x0005,
|
|
0x0006,
|
|
0x0007,
|
|
0x0008,
|
|
0x0009,
|
|
0x000a,
|
|
0x000b,
|
|
0x000c,
|
|
0x000d,
|
|
0x000e,
|
|
0x000f,
|
|
0x0010,
|
|
0x0011,
|
|
0x0012,
|
|
0x0013,
|
|
0x0014,
|
|
0x0015,
|
|
0x0016,
|
|
0x0017,
|
|
0x0018,
|
|
0x0019,
|
|
0x001a,
|
|
0x001b,
|
|
0x001c,
|
|
0x001d,
|
|
0x001e,
|
|
0x001f,
|
|
0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f, // 32
|
|
0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,
|
|
0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,
|
|
0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,0x001f,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 64
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 96
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
|
|
#if defined (__MACH__) || defined( __LINUX__ ) || defined( __MCUXPRESSO )
|
|
//
|
|
// API for C
|
|
//
|
|
|
|
//
|
|
// Memory initialization
|
|
//
|
|
int JPEG_openRAM(JPEGIMAGE *pJPEG, uint8_t *pData, int iDataSize, JPEG_DRAW_CALLBACK *pfnDraw)
|
|
{
|
|
memset(pJPEG, 0, sizeof(JPEGIMAGE));
|
|
pJPEG->ucMemType = JPEG_MEM_RAM;
|
|
pJPEG->pfnRead = readRAM;
|
|
pJPEG->pfnSeek = seekMem;
|
|
pJPEG->pfnDraw = pfnDraw;
|
|
pJPEG->pfnOpen = NULL;
|
|
pJPEG->pfnClose = NULL;
|
|
pJPEG->JPEGFile.iSize = iDataSize;
|
|
pJPEG->JPEGFile.pData = pData;
|
|
pJPEG->iMaxMCUs = 1000; // set to an unnaturally high value to start
|
|
return JPEGInit(pJPEG);
|
|
} /* JPEG_openRAM() */
|
|
//
|
|
// File initialization
|
|
//
|
|
int JPEG_openFile(JPEGIMAGE *pJPEG, const char *szFilename, JPEG_DRAW_CALLBACK *pfnDraw)
|
|
{
|
|
memset(pJPEG, 0, sizeof(JPEGIMAGE));
|
|
pJPEG->ucMemType = JPEG_MEM_RAM;
|
|
pJPEG->pfnRead = readFile;
|
|
pJPEG->pfnSeek = seekFile;
|
|
pJPEG->pfnDraw = pfnDraw;
|
|
pJPEG->pfnOpen = NULL;
|
|
pJPEG->pfnClose = closeFile;
|
|
pJPEG->iMaxMCUs = 1000; // set to an unnaturally high value to start
|
|
pJPEG->JPEGFile.fHandle = fopen(szFilename, "r+b");
|
|
if (pJPEG->JPEGFile.fHandle == NULL)
|
|
return 0;
|
|
fseek((FILE *)pJPEG->JPEGFile.fHandle, 0, SEEK_END);
|
|
pJPEG->JPEGFile.iSize = (int)ftell((FILE *)pJPEG->JPEGFile.fHandle);
|
|
fseek((FILE *)pJPEG->JPEGFile.fHandle, 0, SEEK_SET);
|
|
return JPEGInit(pJPEG);
|
|
} /* JPEG_openFile() */
|
|
|
|
int JPEG_getLastError(JPEGIMAGE *pJPEG)
|
|
{
|
|
return pJPEG->iError;
|
|
} /* JPEG_getLastError() */
|
|
|
|
int JPEG_getWidth(JPEGIMAGE *pJPEG)
|
|
{
|
|
return pJPEG->iWidth;
|
|
} /* JPEG_getWidth() */
|
|
|
|
int JPEG_getHeight(JPEGIMAGE *pJPEG)
|
|
{
|
|
return pJPEG->iHeight;
|
|
} /* JPEG_getHeight() */
|
|
|
|
int JPEG_getOrientation(JPEGIMAGE *pJPEG)
|
|
{
|
|
return (int)pJPEG->ucOrientation;
|
|
} /* JPEG_getOrientation() */
|
|
|
|
int JPEG_getBpp(JPEGIMAGE *pJPEG)
|
|
{
|
|
return (int)pJPEG->ucBpp;
|
|
} /* JPEG_getBpp() */
|
|
int JPEG_getSubSample(JPEGIMAGE *pJPEG)
|
|
{
|
|
return (int)pJPEG->ucSubSample;
|
|
} /* JPEG_getSubSample() */
|
|
int JPEG_hasThumb(JPEGIMAGE *pJPEG)
|
|
{
|
|
return (int)pJPEG->ucHasThumb;
|
|
} /* JPEG_hasThumb() */
|
|
int JPEG_getThumbWidth(JPEGIMAGE *pJPEG)
|
|
{
|
|
return pJPEG->iThumbWidth;
|
|
} /* JPEG_getThumbWidth() */
|
|
int JPEG_getThumbHeight(JPEGIMAGE *pJPEG)
|
|
{
|
|
return pJPEG->iThumbHeight;
|
|
} /* JPEG_getThumbHeight() */
|
|
void JPEG_setPixelType(JPEGIMAGE *pJPEG, int iType)
|
|
{
|
|
pJPEG->ucPixelType = (uint8_t)iType;
|
|
} /* JPEG_setPixelType() */
|
|
void JPEG_setMaxOutputSize(JPEGIMAGE *pJPEG, int iMaxMCUs)
|
|
{
|
|
if (iMaxMCUs < 1)
|
|
iMaxMCUs = 1; // don't allow invalid value
|
|
pJPEG->iMaxMCUs = iMaxMCUs;
|
|
} /* JPEG_setMaxOutputSize() */
|
|
|
|
int JPEG_decode(JPEGIMAGE *pJPEG, int x, int y, int iOptions)
|
|
{
|
|
pJPEG->iXOffset = x;
|
|
pJPEG->iYOffset = y;
|
|
pJPEG->iOptions = iOptions;
|
|
return DecodeJPEG(pJPEG);
|
|
} /* JPEG_decode() */
|
|
|
|
int JPEG_decodeDither(JPEGIMAGE *pJPEG, uint8_t *pDither, int iOptions)
|
|
{
|
|
pJPEG->iOptions = iOptions;
|
|
pJPEG->pDitherBuffer = pDither;
|
|
return DecodeJPEG(pJPEG);
|
|
} /* JPEG_decodeDither() */
|
|
|
|
void JPEG_close(JPEGIMAGE *pJPEG)
|
|
{
|
|
if (pJPEG->pfnClose)
|
|
(*pJPEG->pfnClose)(pJPEG->JPEGFile.fHandle);
|
|
} /* JPEG_close() */
|
|
|
|
#endif // !__cplusplus
|
|
//
|
|
// Helper functions for memory based images
|
|
//
|
|
static int32_t readRAM(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen)
|
|
{
|
|
int32_t iBytesRead;
|
|
|
|
iBytesRead = iLen;
|
|
if ((pFile->iSize - pFile->iPos) < iLen)
|
|
iBytesRead = pFile->iSize - pFile->iPos;
|
|
if (iBytesRead <= 0)
|
|
return 0;
|
|
memcpy(pBuf, &pFile->pData[pFile->iPos], iBytesRead);
|
|
pFile->iPos += iBytesRead;
|
|
return iBytesRead;
|
|
} /* readRAM() */
|
|
|
|
static int32_t readFLASH(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen)
|
|
{
|
|
int32_t iBytesRead;
|
|
|
|
iBytesRead = iLen;
|
|
if ((pFile->iSize - pFile->iPos) < iLen)
|
|
iBytesRead = pFile->iSize - pFile->iPos;
|
|
if (iBytesRead <= 0)
|
|
return 0;
|
|
memcpy_P(pBuf, &pFile->pData[pFile->iPos], iBytesRead);
|
|
pFile->iPos += iBytesRead;
|
|
return iBytesRead;
|
|
} /* readFLASH() */
|
|
|
|
static int32_t seekMem(JPEGFILE *pFile, int32_t iPosition)
|
|
{
|
|
if (iPosition < 0) iPosition = 0;
|
|
else if (iPosition >= pFile->iSize) iPosition = pFile->iSize-1;
|
|
pFile->iPos = iPosition;
|
|
return iPosition;
|
|
} /* seekMem() */
|
|
|
|
#if defined (__MACH__) || defined( __LINUX__ ) || defined( __MCUXPRESSO )
|
|
|
|
static void closeFile(void *handle)
|
|
{
|
|
fclose((FILE *)handle);
|
|
} /* closeFile() */
|
|
|
|
static int32_t seekFile(JPEGFILE *pFile, int32_t iPosition)
|
|
{
|
|
if (iPosition < 0) iPosition = 0;
|
|
else if (iPosition >= pFile->iSize) iPosition = pFile->iSize-1;
|
|
pFile->iPos = iPosition;
|
|
fseek((FILE *)pFile->fHandle, iPosition, SEEK_SET);
|
|
return iPosition;
|
|
} /* seekFile() */
|
|
|
|
static int32_t readFile(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen)
|
|
{
|
|
int32_t iBytesRead;
|
|
|
|
iBytesRead = iLen;
|
|
if ((pFile->iSize - pFile->iPos) < iLen)
|
|
iBytesRead = pFile->iSize - pFile->iPos;
|
|
if (iBytesRead <= 0)
|
|
return 0;
|
|
iBytesRead = (int)fread(pBuf, 1, iBytesRead, (FILE *)pFile->fHandle);
|
|
pFile->iPos += iBytesRead;
|
|
return iBytesRead;
|
|
} /* readFile() */
|
|
|
|
#endif // __LINUX__
|
|
//
|
|
// The following functions are written in plain C and have no
|
|
// 3rd party dependencies, not even the C runtime library
|
|
//
|
|
//
|
|
// Initialize a JPEG file and callback access from a file on SD or memory
|
|
// returns 1 for success, 0 for failure
|
|
// Fills in the basic image info fields of the JPEGIMAGE structure
|
|
//
|
|
static int JPEGInit(JPEGIMAGE *pJPEG)
|
|
{
|
|
return JPEGParseInfo(pJPEG, 0); // gather info for image
|
|
} /* JPEGInit() */
|
|
//
|
|
// Unpack the Huffman tables
|
|
//
|
|
static int JPEGGetHuffTables(uint8_t *pBuf, int iLen, JPEGIMAGE *pJPEG)
|
|
{
|
|
int i, j, iOffset, iTableOffset;
|
|
uint8_t ucTable, *pHuffVals;
|
|
|
|
iOffset = 0;
|
|
pHuffVals = (uint8_t *)pJPEG->usPixels; // temp holding area to save RAM
|
|
while (iLen > 17) // while there are tables to copy (we may have combined more than 1 table together)
|
|
{
|
|
ucTable = pBuf[iOffset++]; // get table index
|
|
if (ucTable & 0x10) // convert AC offset of 0x10 into offset of 4
|
|
ucTable ^= 0x14;
|
|
pJPEG->ucHuffTableUsed |= (1 << ucTable); // mark this table as being defined
|
|
if (ucTable <= 7) // tables are 0-3, AC+DC
|
|
{
|
|
iTableOffset = ucTable * HUFF_TABLEN;
|
|
j = 0; // total bits
|
|
for (i=0; i<16; i++)
|
|
{
|
|
j += pBuf[iOffset];
|
|
pHuffVals[iTableOffset+i] = pBuf[iOffset++];
|
|
}
|
|
iLen -= 17; // subtract length of bit lengths
|
|
if (j == 0 || j > 256 || j > iLen) // bogus bit lengths
|
|
{
|
|
return -1;
|
|
}
|
|
iTableOffset += 16;
|
|
for (i=0; i<j; i++)
|
|
{ // copy huffman table
|
|
pHuffVals[iTableOffset+i] = pBuf[iOffset++];
|
|
}
|
|
iLen -= j;
|
|
}
|
|
}
|
|
return 0;
|
|
} /* JPEGGetHuffTables() */
|
|
#ifdef FUTURE
|
|
//
|
|
// Create 11-bit lookup tables for some images where it doesn't work
|
|
// for 10-bit tables
|
|
//
|
|
static int JPEGMakeHuffTables_Slow(JPEGIMAGE *pJPEG, int bThumbnail)
|
|
{
|
|
int code, repeat, count, codestart;
|
|
int j;
|
|
int iLen, iTable;
|
|
unsigned short *pTable, *pShort, *pLong;
|
|
unsigned char *pucTable, *pucShort, *pucLong;
|
|
uint32_t ul, *pLongTable;
|
|
int iBitNum; // current code bit length
|
|
int cc; // code
|
|
unsigned char *p, *pBits, ucCode;
|
|
int iMaxLength, iMaxMask;
|
|
|
|
pJPEG->b11Bit = 1; // indicate we're using the bigger A/C decode tables
|
|
// first do DC components (up to 4 tables of 12-bit codes)
|
|
// we can save time and memory for the DC codes by knowing that there exist short codes (<= 6 bits)
|
|
// and long codes (>6 bits, but the first 5 bits are 1's). This allows us to create 2 tables: a 6-bit and 7 or 8-bit
|
|
// to handle any DC codes
|
|
iMaxLength = 12; // assume DC codes can be 12-bits
|
|
iMaxMask = 0x7f; // lower 7 bits after truncate 5 leading 1's
|
|
if (pJPEG->ucMode == 0xc3) // create 13-bit tables for lossless mode
|
|
{
|
|
iMaxLength = 13;
|
|
iMaxMask = 0xff;
|
|
}
|
|
for (iTable = 0; iTable < 2; iTable++)
|
|
{
|
|
if (pJPEG->ucHuffTableUsed & (1<<iTable))
|
|
{
|
|
// pJPEG->huffdcFast[iTable] = (int *)PILIOAlloc(0x180); // short table = 128 bytes, long table = 256 bytes
|
|
pucShort = (unsigned char *)&pJPEG->ucHuffDC[iTable*DC_TABLE_SIZE];
|
|
// pJPEG->huffdc[iTable] = pJPEG->huffdcFast[iTable] + 0x20; // 0x20 longs = 128 bytes
|
|
pucLong = (unsigned char *)&pJPEG->ucHuffDC[iTable*DC_TABLE_SIZE + 128];
|
|
pBits = &pJPEG->ucHuffVals[iTable * HUFF_TABLEN];
|
|
p = pBits;
|
|
p += 16; // point to bit data
|
|
cc = 0; // start with a code of 0
|
|
for (iBitNum = 1; iBitNum <= 16; iBitNum++)
|
|
{
|
|
iLen = *pBits++; // get number of codes for this bit length
|
|
if (iBitNum > iMaxLength && iLen > 0) // we can't handle codes longer a certain length
|
|
{
|
|
return -1;
|
|
}
|
|
while (iLen)
|
|
{
|
|
// if (iBitNum > 6) // do long table
|
|
if ((cc >> (iBitNum-5)) == 0x1f) // first 5 bits are 1 - use long table
|
|
{
|
|
count = iMaxLength - iBitNum;
|
|
codestart = cc << count;
|
|
pucTable = &pucLong[codestart & iMaxMask]; // use lower 7/8 bits of code
|
|
}
|
|
else // do short table
|
|
{
|
|
count = 6 - iBitNum;
|
|
if (count < 0)
|
|
return -1; // DEBUG - something went wrong
|
|
codestart = cc << count;
|
|
pucTable = &pucShort[codestart];
|
|
}
|
|
ucCode = *p++; // get actual huffman code
|
|
if (ucCode == 16 && pJPEG->ucMode == 0xc3) // lossless mode
|
|
{
|
|
// in lossless mode, this code won't fit in 4 bits, so save it's length in the next slot
|
|
ucCode = 255;
|
|
pucLong[256] = (unsigned char)iBitNum;
|
|
}
|
|
// does precalculating the DC value save time on ARM?
|
|
#ifndef USE_ARM_ASM
|
|
if (ucCode != 0 && (ucCode + iBitNum) <= 6 && pJPEG->ucMode != 0xc2) // we can fit the magnitude value in the code lookup (not for progressive)
|
|
{
|
|
int k, iLoop;
|
|
unsigned char ucCoeff;
|
|
unsigned char *d = &pucTable[512];
|
|
unsigned char ucMag = ucCode;
|
|
ucCode |= ((iBitNum+ucCode) << 4); // add magnitude bits to length
|
|
repeat = 1<<ucMag;
|
|
iLoop = 1<<(count-ucMag);
|
|
for (j=0; j<repeat; j++)
|
|
{ // calcuate the magnitude coeff already
|
|
if (j & 1<<(ucMag-1)) // positive number
|
|
ucCoeff = (unsigned char)j;
|
|
else // negative number
|
|
ucCoeff = (unsigned char)(j - ((1<<ucMag)-1));
|
|
for (k=0; k<iLoop; k++)
|
|
{
|
|
*d++ = ucCoeff;
|
|
} // for k
|
|
} // for j
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
ucCode |= (iBitNum << 4);
|
|
}
|
|
if (count) // do it as dwords to save time
|
|
{
|
|
repeat = (1<<count);
|
|
memset(pucTable, ucCode, repeat);
|
|
// pLongTable = (uint32_t *)pTable;
|
|
// repeat = 1 << (count-2); // store as dwords (/4)
|
|
// ul = code | (code << 16);
|
|
// for (j=0; j<repeat; j++)
|
|
// *pLongTable++ = ul;
|
|
}
|
|
else
|
|
{
|
|
pucTable[0] = ucCode;
|
|
}
|
|
cc++;
|
|
iLen--;
|
|
}
|
|
cc <<= 1;
|
|
}
|
|
} // if table defined
|
|
}
|
|
// now do AC components (up to 2 tables of 16-bit codes)
|
|
// We split the codes into a short table (9 bits or less) and a long table (first 5 bits are 1)
|
|
for (iTable = 0; iTable < 2; iTable++)
|
|
{
|
|
if (pJPEG->ucHuffTableUsed & (1<<(iTable+4))) // if this table is defined
|
|
{
|
|
pBits = &pJPEG->ucHuffVals[(iTable+4) * HUFF_TABLEN];
|
|
p = pBits;
|
|
p += 16; // point to bit data
|
|
pShort = &pJPEG->usHuffAC[iTable*HUFF11SIZE];
|
|
pLong = &pJPEG->usHuffAC[iTable*HUFF11SIZE + 1024]; // long codes start here
|
|
cc = 0; // start with a code of 0
|
|
// construct the decode table
|
|
for (iBitNum = 1; iBitNum <= 16; iBitNum++)
|
|
{
|
|
iLen = *pBits++; // get number of codes for this bit length
|
|
while (iLen)
|
|
{
|
|
if ((cc >> (iBitNum-4)) == 0xf) // first 4 bits are 1 - use long table
|
|
{
|
|
count = 16 - iBitNum;
|
|
codestart = cc << count;
|
|
pTable = &pLong[codestart & 0xfff]; // use lower 12 bits of code
|
|
}
|
|
else
|
|
{
|
|
count = 12 - iBitNum;
|
|
if (count < 0) // a 13-bit? code - that doesn't fit our optimized scheme, see if we can do a bigger table version
|
|
{
|
|
return -1; // DEBUG - fatal error, we currently don't support it
|
|
}
|
|
codestart = cc << count;
|
|
pTable = &pShort[codestart]; // 11 bits or shorter
|
|
}
|
|
code = *p++; // get actual huffman code
|
|
if (bThumbnail && code != 0) // add "extra" bits to code length since we skip these codes
|
|
{
|
|
// get rid of extra bits in code and add increment (1) for AC index
|
|
code = ((iBitNum+(code & 0xf)) << 8) | ((code >> 4)+1);
|
|
}
|
|
else
|
|
{
|
|
code |= (iBitNum << 8);
|
|
}
|
|
if (count) // do it as dwords to save time
|
|
{
|
|
repeat = 1 << (count-1); // store as dwords (/2)
|
|
ul = code | (code << 16);
|
|
pLongTable = (uint32_t *)pTable;
|
|
for (j=0; j<repeat; j++)
|
|
*pLongTable++ = ul;
|
|
}
|
|
else
|
|
{
|
|
pTable[0] = (unsigned short)code;
|
|
}
|
|
cc++;
|
|
iLen--;
|
|
}
|
|
cc <<= 1;
|
|
} // for each bit length
|
|
} // if table defined
|
|
}
|
|
return 0;
|
|
} /* JPEGMakeHuffTables_Slow() */
|
|
#endif // FUTURE
|
|
//
|
|
// Expand the Huffman tables for fast decoding
|
|
// returns 1 for success, 0 for failure
|
|
//
|
|
static int JPEGMakeHuffTables(JPEGIMAGE *pJPEG, int bThumbnail)
|
|
{
|
|
int code, repeat, count, codestart;
|
|
int j;
|
|
int iLen, iTable;
|
|
uint16_t *pTable, *pShort, *pLong;
|
|
uint8_t *pHuffVals, *pucTable, *pucShort, *pucLong;
|
|
uint32_t ul, *pLongTable;
|
|
int iBitNum; // current code bit length
|
|
int cc; // code
|
|
uint8_t *p, *pBits, ucCode;
|
|
int iMaxLength, iMaxMask;
|
|
int iTablesUsed;
|
|
|
|
iTablesUsed = 0;
|
|
pHuffVals = (uint8_t *)pJPEG->usPixels;
|
|
for (j=0; j<4; j++)
|
|
{
|
|
if (pJPEG->ucHuffTableUsed & (1 << j))
|
|
iTablesUsed++;
|
|
}
|
|
// first do DC components (up to 4 tables of 12-bit codes)
|
|
// we can save time and memory for the DC codes by knowing that there exist short codes (<= 6 bits)
|
|
// and long codes (>6 bits, but the first 5 bits are 1's). This allows us to create 2 tables: a 6-bit and 7 or 8-bit
|
|
// to handle any DC codes
|
|
iMaxLength = 12; // assume DC codes can be 12-bits
|
|
iMaxMask = 0x7f; // lower 7 bits after truncate 5 leading 1's
|
|
for (iTable = 0; iTable < 4; iTable++)
|
|
{
|
|
if (pJPEG->ucHuffTableUsed & (1 << iTable))
|
|
{
|
|
// pJPEG->huffdcFast[iTable] = (int *)PILIOAlloc(0x180); // short table = 128 bytes, long table = 256 bytes
|
|
pucShort = &pJPEG->ucHuffDC[iTable*DC_TABLE_SIZE];
|
|
// pJPEG->huffdc[iTable] = pJPEG->huffdcFast[iTable] + 0x20; // 0x20 longs = 128 bytes
|
|
pucLong = &pJPEG->ucHuffDC[iTable*DC_TABLE_SIZE + 128];
|
|
pBits = &pHuffVals[iTable * HUFF_TABLEN];
|
|
p = pBits;
|
|
p += 16; // point to bit data
|
|
cc = 0; // start with a code of 0
|
|
for (iBitNum = 1; iBitNum <= 16; iBitNum++)
|
|
{
|
|
iLen = *pBits++; // get number of codes for this bit length
|
|
if (iBitNum > iMaxLength && iLen > 0) // we can't handle codes longer a certain length
|
|
{
|
|
return 0;
|
|
}
|
|
while (iLen)
|
|
{
|
|
// if (iBitNum > 6) // do long table
|
|
if ((cc >> (iBitNum-5)) == 0x1f) // first 5 bits are 1 - use long table
|
|
{
|
|
count = iMaxLength - iBitNum;
|
|
codestart = cc << count;
|
|
pucTable = &pucLong[codestart & iMaxMask]; // use lower 7/8 bits of code
|
|
}
|
|
else // do short table
|
|
{
|
|
count = 6 - iBitNum;
|
|
if (count < 0)
|
|
return 0; // DEBUG - something went wrong
|
|
codestart = cc << count;
|
|
pucTable = &pucShort[codestart];
|
|
}
|
|
ucCode = *p++; // get actual huffman code
|
|
// does precalculating the DC value save time on ARM?
|
|
#ifndef USE_ARM_ASM
|
|
if (ucCode != 0 && (ucCode + iBitNum) <= 6 && pJPEG->ucMode != 0xc2) // we can fit the magnitude value in the code lookup (not for progressive)
|
|
{
|
|
int k, iLoop;
|
|
unsigned char ucCoeff;
|
|
unsigned char *d = &pucTable[512];
|
|
unsigned char ucMag = ucCode;
|
|
ucCode |= ((iBitNum+ucCode) << 4); // add magnitude bits to length
|
|
repeat = 1<<ucMag;
|
|
iLoop = 1<<(count-ucMag);
|
|
for (j=0; j<repeat; j++)
|
|
{ // calcuate the magnitude coeff already
|
|
if (j & 1<<(ucMag-1)) // positive number
|
|
ucCoeff = (unsigned char)j;
|
|
else // negative number
|
|
ucCoeff = (unsigned char)(j - ((1<<ucMag)-1));
|
|
for (k=0; k<iLoop; k++)
|
|
{
|
|
*d++ = ucCoeff;
|
|
} // for k
|
|
} // for j
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
ucCode |= (iBitNum << 4);
|
|
}
|
|
if (count) // do it as dwords to save time
|
|
{
|
|
repeat = (1<<count);
|
|
memset(pucTable, ucCode, repeat);
|
|
// pLongTable = (uint32_t *)pTable;
|
|
// repeat = 1 << (count-2); // store as dwords (/4)
|
|
// ul = code | (code << 16);
|
|
// for (j=0; j<repeat; j++)
|
|
// *pLongTable++ = ul;
|
|
}
|
|
else
|
|
{
|
|
pucTable[0] = ucCode;
|
|
}
|
|
cc++;
|
|
iLen--;
|
|
}
|
|
cc <<= 1;
|
|
}
|
|
} // if table defined
|
|
}
|
|
// now do AC components (up to 4 tables of 16-bit codes)
|
|
// We split the codes into a short table (9 bits or less) and a long table (first 5 bits are 1)
|
|
for (iTable = 0; iTable < 4; iTable++)
|
|
{
|
|
if (pJPEG->ucHuffTableUsed & (1 << (iTable+4))) // if this table is defined
|
|
{
|
|
pBits = &pHuffVals[(iTable+4) * HUFF_TABLEN];
|
|
p = pBits;
|
|
p += 16; // point to bit data
|
|
pShort = &pJPEG->usHuffAC[iTable*HUFF11SIZE];
|
|
pLong = &pJPEG->usHuffAC[iTable*HUFF11SIZE + 1024];
|
|
cc = 0; // start with a code of 0
|
|
// construct the decode table
|
|
for (iBitNum = 1; iBitNum <= 16; iBitNum++)
|
|
{
|
|
iLen = *pBits++; // get number of codes for this bit length
|
|
while (iLen)
|
|
{
|
|
if ((cc >> (iBitNum-6)) == 0x3f) // first 6 bits are 1 - use long table
|
|
{
|
|
count = 16 - iBitNum;
|
|
codestart = cc << count;
|
|
pTable = &pLong[codestart & 0x3ff]; // use lower 10 bits of code
|
|
}
|
|
else
|
|
{
|
|
count = 10 - iBitNum;
|
|
if (count < 0) // an 11/12-bit? code - that doesn't fit our optimized scheme, see if we can do a bigger table version
|
|
{
|
|
if (count == -1 && iTablesUsed <= 4) // we need to create "slow" tables
|
|
{ // DEBUG
|
|
// j = JPEGMakeHuffTables_Slow(pJPEG, bThumbnail);
|
|
return 0;
|
|
}
|
|
else
|
|
return 0; // DEBUG - fatal error, more than 2 big tables we currently don't support
|
|
}
|
|
codestart = cc << count;
|
|
pTable = &pShort[codestart]; // 10 bits or shorter
|
|
}
|
|
code = *p++; // get actual huffman code
|
|
if (bThumbnail && code != 0) // add "extra" bits to code length since we skip these codes
|
|
{
|
|
// get rid of extra bits in code and add increment (1) for AC index
|
|
code = ((iBitNum+(code & 0xf)) << 8) | ((code >> 4)+1);
|
|
}
|
|
#ifdef BOGUS // precalculating the AC coeff makes it run slightly slower
|
|
else if ((code & 0xf) != 0 && (code + iBitNum) <= 10) // we can fit the magnitude value + huffman code in a single read
|
|
{
|
|
int k, iLoop;
|
|
unsigned short usCoeff;
|
|
unsigned short *d = &pTable[4096]; // use unused table slots 2+3 for extra coeff data
|
|
unsigned char ucMag = (unsigned char)(code & 0xf);
|
|
code |= ((iBitNum + (code & 0xf)) << 8); // add magnitude bits to length
|
|
repeat = 1<<ucMag;
|
|
iLoop = 1<<(count-ucMag);
|
|
for (j=0; j<repeat; j++)
|
|
{ // calcuate the magnitude coeff already
|
|
if (j & 1<<(ucMag-1)) // positive number
|
|
usCoeff = (unsigned short)j;
|
|
else // negative number
|
|
usCoeff = (unsigned short)(j - ((1<<ucMag)-1));
|
|
for (k=0; k<iLoop; k++)
|
|
{
|
|
*d++ = usCoeff;
|
|
} // for k
|
|
} // for j
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
code |= (iBitNum << 8);
|
|
}
|
|
if (count) // do it as dwords to save time
|
|
{
|
|
repeat = 1 << (count-1); // store as dwords (/2)
|
|
ul = code | (code << 16);
|
|
pLongTable = (uint32_t *)pTable;
|
|
for (j=0; j<repeat; j++)
|
|
*pLongTable++ = ul;
|
|
}
|
|
else
|
|
{
|
|
pTable[0] = (unsigned short)code;
|
|
}
|
|
cc++;
|
|
iLen--;
|
|
}
|
|
cc <<= 1;
|
|
} // for each bit length
|
|
} // if table defined
|
|
}
|
|
return 1;
|
|
} /* JPEGMakeHuffTables() */
|
|
|
|
//
|
|
// TIFFSHORT
|
|
// read a 16-bit unsigned integer from the given pointer
|
|
// and interpret the data as big endian (Motorola) or little endian (Intel)
|
|
//
|
|
static uint16_t TIFFSHORT(unsigned char *p, int bMotorola)
|
|
{
|
|
unsigned short s;
|
|
|
|
if (bMotorola)
|
|
s = *p * 0x100 + *(p+1); // big endian (AKA Motorola byte order)
|
|
else
|
|
s = *p + *(p+1)*0x100; // little endian (AKA Intel byte order)
|
|
return s;
|
|
} /* TIFFSHORT() */
|
|
//
|
|
// TIFFLONG
|
|
// read a 32-bit unsigned integer from the given pointer
|
|
// and interpret the data as big endian (Motorola) or little endian (Intel)
|
|
//
|
|
static uint32_t TIFFLONG(unsigned char *p, int bMotorola)
|
|
{
|
|
uint32_t l;
|
|
|
|
if (bMotorola)
|
|
l = *p * 0x1000000 + *(p+1) * 0x10000 + *(p+2) * 0x100 + *(p+3); // big endian
|
|
else
|
|
l = *p + *(p+1) * 0x100 + *(p+2) * 0x10000 + *(p+3) * 0x1000000; // little endian
|
|
return l;
|
|
} /* TIFFLONG() */
|
|
//
|
|
// TIFFVALUE
|
|
// read an integer value encoded in a TIFF TAG (12-byte structure)
|
|
// and interpret the data as big endian (Motorola) or little endian (Intel)
|
|
//
|
|
static int TIFFVALUE(unsigned char *p, int bMotorola)
|
|
{
|
|
int i, iType;
|
|
|
|
iType = TIFFSHORT(p+2, bMotorola);
|
|
/* If pointer to a list of items, must be a long */
|
|
if (TIFFSHORT(p+4, bMotorola) > 1)
|
|
{
|
|
iType = 4;
|
|
}
|
|
switch (iType)
|
|
{
|
|
case 3: /* Short */
|
|
i = TIFFSHORT(p+8, bMotorola);
|
|
break;
|
|
case 4: /* Long */
|
|
case 7: // undefined (treat it as a long since it's usually a multibyte buffer)
|
|
i = TIFFLONG(p+8, bMotorola);
|
|
break;
|
|
case 6: // signed byte
|
|
i = (signed char)p[8];
|
|
break;
|
|
case 2: /* ASCII */
|
|
case 5: /* Unsigned Rational */
|
|
case 10: /* Signed Rational */
|
|
i = TIFFLONG(p+8, bMotorola);
|
|
break;
|
|
default: /* to suppress compiler warning */
|
|
i = 0;
|
|
break;
|
|
}
|
|
return i;
|
|
|
|
} /* TIFFVALUE() */
|
|
static void GetTIFFInfo(JPEGIMAGE *pPage, int bMotorola, int iOffset)
|
|
{
|
|
int iTag, iTagCount, i;
|
|
uint8_t *cBuf = pPage->ucFileBuf;
|
|
|
|
iTagCount = TIFFSHORT(&cBuf[iOffset], bMotorola); /* Number of tags in this dir */
|
|
if (iTagCount < 1 || iTagCount > 256) // invalid tag count
|
|
return; /* Bad header info */
|
|
/*--- Search the TIFF tags ---*/
|
|
for (i=0; i<iTagCount; i++)
|
|
{
|
|
unsigned char *p = &cBuf[iOffset + (i*12) +2];
|
|
iTag = TIFFSHORT(p, bMotorola); /* current tag value */
|
|
if (iTag == 274) // orientation tag
|
|
{
|
|
pPage->ucOrientation = TIFFVALUE(p, bMotorola);
|
|
}
|
|
else if (iTag == 256) // width of thumbnail
|
|
{
|
|
pPage->iThumbWidth = TIFFVALUE(p, bMotorola);
|
|
}
|
|
else if (iTag == 257) // height of thumbnail
|
|
{
|
|
pPage->iThumbHeight = TIFFVALUE(p, bMotorola);
|
|
}
|
|
else if (iTag == 513) // offset to JPEG data
|
|
{
|
|
pPage->iThumbData = TIFFVALUE(p, bMotorola);
|
|
}
|
|
}
|
|
} /* GetTIFFInfo() */
|
|
|
|
static int JPEGGetSOS(JPEGIMAGE *pJPEG, int *iOff)
|
|
{
|
|
int16_t sLen;
|
|
int iOffset = *iOff;
|
|
int i, j;
|
|
uint8_t uc,c,cc;
|
|
uint8_t *buf = pJPEG->ucFileBuf;
|
|
|
|
sLen = MOTOSHORT(&buf[iOffset]);
|
|
iOffset += 2;
|
|
|
|
// Assume no components in this scan
|
|
for (i=0; i<4; i++)
|
|
pJPEG->JPCI[i].component_needed = 0;
|
|
|
|
uc = buf[iOffset++]; // get number of components
|
|
pJPEG->ucComponentsInScan = uc;
|
|
sLen -= 3;
|
|
if (uc < 1 || uc > MAX_COMPS_IN_SCAN || sLen != (uc*2+3)) // check length of data packet
|
|
return 1; // error
|
|
for (i=0; i<uc; i++)
|
|
{
|
|
cc = buf[iOffset++];
|
|
c = buf[iOffset++];
|
|
sLen -= 2;
|
|
for (j=0; j<4; j++) // search for component id
|
|
{
|
|
if (pJPEG->JPCI[j].component_id == cc)
|
|
break;
|
|
}
|
|
if (j == 4) // error, not found
|
|
return 1;
|
|
if ((c & 0xf) > 3 || (c & 0xf0) > 0x30)
|
|
return 1; // bogus table numbers
|
|
pJPEG->JPCI[j].dc_tbl_no = c >> 4;
|
|
pJPEG->JPCI[j].ac_tbl_no = c & 0xf;
|
|
pJPEG->JPCI[j].component_needed = 1; // mark this component as being included in the scan
|
|
}
|
|
pJPEG->iScanStart = buf[iOffset++]; // Get the scan start (or lossless predictor) for this scan
|
|
pJPEG->iScanEnd = buf[iOffset++]; // Get the scan end for this scan
|
|
c = buf[iOffset++]; // successive approximation bits
|
|
pJPEG->cApproxBitsLow = c & 0xf; // also point transform in lossless mode
|
|
pJPEG->cApproxBitsHigh = c >> 4;
|
|
|
|
*iOff = iOffset;
|
|
return 0;
|
|
|
|
} /* JPEGGetSOS() */
|
|
//
|
|
// Remove markers from the data stream to allow faster decode
|
|
// Stuffed zeros and restart interval markers aren't needed to properly decode
|
|
// the data, but they make reading VLC data slower, so I pull them out first
|
|
//
|
|
static int JPEGFilter(uint8_t *pBuf, uint8_t *d, int iLen, uint8_t *bFF)
|
|
{
|
|
// since we have the entire jpeg buffer in memory already, we can just change it in place
|
|
unsigned char c, *s, *pEnd, *pStart;
|
|
|
|
pStart = d;
|
|
s = pBuf;
|
|
pEnd = &s[iLen-1]; // stop just shy of the end to not miss a final marker/stuffed 0
|
|
if (*bFF) // last byte was a FF, check the next one
|
|
{
|
|
if (s[0] == 0) // stuffed 0, keep the FF
|
|
*d++ = 0xff;
|
|
s++;
|
|
*bFF = 0;
|
|
}
|
|
while (s < pEnd)
|
|
{
|
|
c = *d++ = *s++;
|
|
if (c == 0xff) // marker or stuffed zeros?
|
|
{
|
|
if (s[0] != 0) // it's a marker, skip both
|
|
{
|
|
d--;
|
|
}
|
|
s++; // for stuffed 0's, store the FF, skip the 00
|
|
}
|
|
}
|
|
if (s == pEnd) // need to test the last byte
|
|
{
|
|
c = s[0];
|
|
if (c == 0xff) // last byte is FF, take care of it next time through
|
|
*bFF = 1; // take care of it next time through
|
|
else
|
|
*d++ = c; // nope, just store it
|
|
}
|
|
return (int)(d-pStart); // filtered output length
|
|
} /* JPEGFilter() */
|
|
//
|
|
// Read and filter more VLC data for decoding
|
|
//
|
|
static void JPEGGetMoreData(JPEGIMAGE *pPage)
|
|
{
|
|
int iDelta = pPage->iVLCSize - pPage->iVLCOff;
|
|
// printf("Getting more data...size=%d, off=%d\n", pPage->iVLCSize, pPage->iVLCOff);
|
|
// move any existing data down
|
|
if (iDelta >= (JPEG_FILE_BUF_SIZE-64) || iDelta < 0)
|
|
return; // buffer is already full; no need to read more data
|
|
if (pPage->iVLCOff != 0)
|
|
{
|
|
memcpy(pPage->ucFileBuf, &pPage->ucFileBuf[pPage->iVLCOff], pPage->iVLCSize - pPage->iVLCOff);
|
|
pPage->iVLCSize -= pPage->iVLCOff;
|
|
pPage->iVLCOff = 0;
|
|
pPage->bb.pBuf = pPage->ucFileBuf; // reset VLC source pointer too
|
|
}
|
|
if (pPage->JPEGFile.iPos < pPage->JPEGFile.iSize && pPage->iVLCSize < JPEG_FILE_BUF_SIZE-64)
|
|
{
|
|
int i;
|
|
// Try to read enough to fill the buffer
|
|
i = (*pPage->pfnRead)(&pPage->JPEGFile, &pPage->ucFileBuf[pPage->iVLCSize], JPEG_FILE_BUF_SIZE - pPage->iVLCSize); // max length we can read
|
|
// Filter out the markers
|
|
pPage->iVLCSize += JPEGFilter(&pPage->ucFileBuf[pPage->iVLCSize], &pPage->ucFileBuf[pPage->iVLCSize], i, &pPage->ucFF);
|
|
}
|
|
} /* JPEGGetMoreData() */
|
|
|
|
//
|
|
// Parse the JPEG header, gather necessary info to decode the image
|
|
// Returns 1 for success, 0 for failure
|
|
//
|
|
static int JPEGParseInfo(JPEGIMAGE *pPage, int bExtractThumb)
|
|
{
|
|
int iBytesRead;
|
|
int i, iOffset, iTableOffset;
|
|
uint8_t ucTable, *s = pPage->ucFileBuf;
|
|
uint16_t usMarker, usLen = 0;
|
|
int iFilePos = 0;
|
|
|
|
if (bExtractThumb) // seek to the start of the thumbnail image
|
|
{
|
|
iFilePos = pPage->iThumbData;
|
|
(*pPage->pfnSeek)(&pPage->JPEGFile, iFilePos);
|
|
}
|
|
iBytesRead = (*pPage->pfnRead)(&pPage->JPEGFile, s, JPEG_FILE_BUF_SIZE);
|
|
if (iBytesRead < 256) // a JPEG file this tiny? probably bad
|
|
{
|
|
pPage->iError = JPEG_INVALID_FILE;
|
|
return 0;
|
|
}
|
|
iFilePos += iBytesRead;
|
|
if (MOTOSHORT(pPage->ucFileBuf) != 0xffd8)
|
|
{
|
|
pPage->iError = JPEG_INVALID_FILE;
|
|
return 0; // not a JPEG file
|
|
}
|
|
iOffset = 2; /* Start at offset of first marker */
|
|
usMarker = 0; /* Search for SOFx (start of frame) marker */
|
|
while (usMarker != 0xffda && iOffset < pPage->JPEGFile.iSize)
|
|
{
|
|
if (iOffset >= JPEG_FILE_BUF_SIZE/2) // too close to the end, read more data
|
|
{
|
|
// Do we need to seek first?
|
|
if (iOffset >= JPEG_FILE_BUF_SIZE)
|
|
{
|
|
iFilePos += (iOffset - iBytesRead);
|
|
iOffset = 0;
|
|
(*pPage->pfnSeek)(&pPage->JPEGFile, iFilePos);
|
|
iBytesRead = 0; // throw away any old data
|
|
}
|
|
// move existing bytes down
|
|
if (iOffset)
|
|
{
|
|
memcpy(pPage->ucFileBuf, &pPage->ucFileBuf[iOffset], iBytesRead - iOffset);
|
|
iBytesRead -= iOffset;
|
|
iOffset = 0;
|
|
}
|
|
i = (*pPage->pfnRead)(&pPage->JPEGFile, &pPage->ucFileBuf[iBytesRead], JPEG_FILE_BUF_SIZE-iBytesRead);
|
|
iFilePos += i;
|
|
iBytesRead += i;
|
|
}
|
|
usMarker = MOTOSHORT(&s[iOffset]);
|
|
iOffset += 2;
|
|
usLen = MOTOSHORT(&s[iOffset]); // marker length
|
|
|
|
if (usMarker < 0xffc0 || usMarker == 0xffff) // invalid marker, could be generated by "Arles Image Web Page Creator" or Accusoft
|
|
{
|
|
iOffset++;
|
|
continue; // skip 1 byte and try to resync
|
|
}
|
|
switch (usMarker)
|
|
{
|
|
case 0xffc1:
|
|
case 0xffc2:
|
|
case 0xffc3:
|
|
pPage->iError = JPEG_UNSUPPORTED_FEATURE;
|
|
return 0; // currently unsupported modes
|
|
|
|
case 0xffe1: // App1 (EXIF?)
|
|
if (s[iOffset+2] == 'E' && s[iOffset+3] == 'x' && (s[iOffset+8] == 'M' || s[iOffset+8] == 'I')) // the EXIF data we want
|
|
{
|
|
int bMotorola, IFD, iTagCount;
|
|
pPage->iEXIF = iFilePos - iBytesRead + iOffset + 8; // start of TIFF file
|
|
// Get the orientation value (if present)
|
|
bMotorola = (s[iOffset+8] == 'M');
|
|
IFD = TIFFLONG(&s[iOffset+12], bMotorola);
|
|
iTagCount = TIFFSHORT(&s[iOffset+16], bMotorola);
|
|
GetTIFFInfo(pPage, bMotorola, IFD+iOffset+8);
|
|
// The second IFD defines the thumbnail (if present)
|
|
if (iTagCount >= 1 && iTagCount < 32) // valid number of tags for EXIF data 'page'
|
|
{
|
|
// point to next IFD
|
|
IFD += (12 * iTagCount) + 2;
|
|
IFD = TIFFLONG(&s[IFD + iOffset + 8], bMotorola);
|
|
if (IFD != 0) // Thumbnail present?
|
|
{
|
|
pPage->ucHasThumb = 1;
|
|
GetTIFFInfo(pPage, bMotorola, IFD+iOffset+8); // info for second 'page' of TIFF
|
|
pPage->iThumbData += iOffset + 8; // absolute offset in the file
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case 0xffc0: // SOFx - start of frame
|
|
pPage->ucMode = (uint8_t)usMarker;
|
|
pPage->ucBpp = s[iOffset+2]; // bits per sample
|
|
pPage->iHeight = MOTOSHORT(&s[iOffset+3]);
|
|
pPage->iWidth = MOTOSHORT(&s[iOffset+5]);
|
|
pPage->ucNumComponents = s[iOffset+7];
|
|
pPage->ucBpp = pPage->ucBpp * pPage->ucNumComponents; /* Bpp = number of components * bits per sample */
|
|
if (pPage->ucNumComponents == 1)
|
|
pPage->ucSubSample = 0; // use this to differentiate from color 1:1
|
|
else
|
|
{
|
|
usLen -= 8;
|
|
iOffset += 8;
|
|
// pPage->ucSubSample = s[iOffset+9]; // subsampling option for the second color component
|
|
for (i=0; i<pPage->ucNumComponents; i++)
|
|
{
|
|
uint8_t ucSamp;
|
|
pPage->JPCI[i].component_id = s[iOffset++];
|
|
pPage->JPCI[i].component_index = (unsigned char)i;
|
|
ucSamp = s[iOffset++]; // get the h+v sampling factor
|
|
if (i == 0) // Y component?
|
|
pPage->ucSubSample = ucSamp;
|
|
// pPage->JPCI[i].h_samp_factor = ucSamp >> 4;
|
|
// pPage->JPCI[i].v_samp_factor = ucSamp & 0xf;
|
|
pPage->JPCI[i].quant_tbl_no = s[iOffset++]; // quantization table number
|
|
usLen -= 3;
|
|
}
|
|
}
|
|
break;
|
|
case 0xffdd: // Restart Interval
|
|
if (usLen == 4)
|
|
pPage->iResInterval = MOTOSHORT(&s[iOffset+2]);
|
|
break;
|
|
case 0xffc4: /* M_DHT */ // get Huffman tables
|
|
iOffset += 2; // skip length
|
|
usLen -= 2; // subtract length length
|
|
if (JPEGGetHuffTables(&s[iOffset], usLen, pPage) != 0) // bad tables?
|
|
{
|
|
pPage->iError = JPEG_DECODE_ERROR;
|
|
return 0; // error
|
|
}
|
|
break;
|
|
case 0xffdb: /* M_DQT */
|
|
/* Get the quantization tables */
|
|
/* first byte has PPPPNNNN where P = precision and N = table number 0-3 */
|
|
iOffset += 2; // skip length
|
|
usLen -= 2; // subtract length length
|
|
while (usLen > 0)
|
|
{
|
|
ucTable = s[iOffset++]; // table number
|
|
if ((ucTable & 0xf) > 3) // invalid table number
|
|
{
|
|
pPage->iError = JPEG_DECODE_ERROR;
|
|
return 0;
|
|
}
|
|
iTableOffset = (ucTable & 0xf) * DCTSIZE;
|
|
if (ucTable & 0xf0) // if word precision
|
|
{
|
|
for (i=0; i<DCTSIZE; i++)
|
|
{
|
|
pPage->sQuantTable[i+iTableOffset] = MOTOSHORT(&s[iOffset]);
|
|
iOffset += 2;
|
|
}
|
|
usLen -= (DCTSIZE*2 + 1);
|
|
}
|
|
else // byte precision
|
|
{
|
|
for (i=0; i<DCTSIZE; i++)
|
|
{
|
|
pPage->sQuantTable[i+iTableOffset] = (unsigned short)s[iOffset++];
|
|
}
|
|
usLen -= (DCTSIZE + 1);
|
|
}
|
|
}
|
|
break;
|
|
} // switch on JPEG marker
|
|
iOffset += usLen;
|
|
} // while
|
|
if (usMarker == 0xffda) // start of image
|
|
{
|
|
if (pPage->ucBpp != 8) // need to match up table IDs
|
|
{
|
|
iOffset -= usLen;
|
|
JPEGGetSOS(pPage, &iOffset); // get Start-Of-Scan info for decoding
|
|
}
|
|
if (!JPEGMakeHuffTables(pPage, 0)) //int bThumbnail) DEBUG
|
|
{
|
|
pPage->iError = JPEG_UNSUPPORTED_FEATURE;
|
|
return 0;
|
|
}
|
|
// Now the offset points to the start of compressed data
|
|
i = JPEGFilter(&pPage->ucFileBuf[iOffset], pPage->ucFileBuf, iBytesRead-iOffset, &pPage->ucFF);
|
|
pPage->iVLCOff = 0;
|
|
pPage->iVLCSize = i;
|
|
JPEGGetMoreData(pPage); // read more VLC data
|
|
return 1;
|
|
}
|
|
pPage->iError = JPEG_DECODE_ERROR;
|
|
return 0;
|
|
} /* JPEGParseInfo() */
|
|
//
|
|
// Fix and reorder the quantization table for faster decoding.*
|
|
//
|
|
static void JPEGFixQuantD(JPEGIMAGE *pJPEG)
|
|
{
|
|
int iTable, iTableOffset;
|
|
signed short sTemp[DCTSIZE];
|
|
int i;
|
|
uint16_t *p;
|
|
|
|
for (iTable=0; iTable<pJPEG->ucNumComponents; iTable++)
|
|
{
|
|
iTableOffset = iTable * DCTSIZE;
|
|
p = (uint16_t *)&pJPEG->sQuantTable[iTableOffset];
|
|
for (i=0; i<DCTSIZE; i++)
|
|
sTemp[i] = p[cZigZag[i]];
|
|
memcpy(&pJPEG->sQuantTable[iTableOffset], sTemp, DCTSIZE*sizeof(short)); // copy back to original spot
|
|
|
|
// Prescale for DCT multiplication
|
|
p = (uint16_t *)&pJPEG->sQuantTable[iTableOffset];
|
|
for (i=0; i<DCTSIZE; i++)
|
|
{
|
|
p[i] = (uint16_t)((p[i] * iScaleBits[i]) >> 12);
|
|
}
|
|
}
|
|
} /* JPEGFixQuantD() */
|
|
//
|
|
// Decode the 64 coefficients of the current DCT block
|
|
//
|
|
static int JPEGDecodeMCU(JPEGIMAGE *pJPEG, int iMCU, int *iDCPredictor)
|
|
{
|
|
uint32_t ulCode, ulTemp;
|
|
uint8_t *pZig;
|
|
signed char cCoeff;
|
|
unsigned short *pFast;
|
|
unsigned char ucHuff, *pucFast;
|
|
uint32_t usHuff; // this prevents an unnecessary & 65535 for shorts
|
|
uint32_t ulBitOff, ulBits; // local copies to allow compiler to use register vars
|
|
uint8_t *pBuf, *pEnd, *pEnd2;
|
|
signed short *pMCU = &pJPEG->sMCUs[iMCU];
|
|
uint8_t ucMaxACCol, ucMaxACRow;
|
|
|
|
#define MIN_DCT_THRESHOLD 8
|
|
|
|
ulBitOff = pJPEG->bb.ulBitOff;
|
|
ulBits = pJPEG->bb.ulBits;
|
|
pBuf = pJPEG->bb.pBuf;
|
|
|
|
pZig = (unsigned char *)&cZigZag2[1];
|
|
pEnd = (unsigned char *)&cZigZag2[64];
|
|
|
|
if (ulBitOff > (REGISTER_WIDTH-17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
if (pJPEG->iOptions & (JPEG_SCALE_QUARTER | JPEG_SCALE_EIGHTH)) // reduced size DCT
|
|
{
|
|
pMCU[1] = pMCU[8] = pMCU[9] = 0;
|
|
pEnd2 = (uint8_t *)&cZigZag2[5]; // we only need to store the 4 elements we care about
|
|
}
|
|
else
|
|
{
|
|
memset(pMCU, 0, 64*sizeof(short)); // pre-fill with zero since we may skip coefficients
|
|
pEnd2 = (uint8_t *)&cZigZag2[64];
|
|
}
|
|
ucMaxACCol = ucMaxACRow = 0;
|
|
pZig = (unsigned char *)&cZigZag2[1];
|
|
pEnd = (unsigned char *)&cZigZag2[64];
|
|
|
|
// get the DC component
|
|
pucFast = &pJPEG->ucHuffDC[pJPEG->ucDCTable * DC_TABLE_SIZE];
|
|
ulCode = (ulBits >> (REGISTER_WIDTH - 12 - ulBitOff)) & 0xfff; // get as lower 12 bits
|
|
if (ulCode >= 0xf80) // it's a long code
|
|
ulCode = (ulCode & 0xff); // point to long table and trim to 7-bits + 0x80 offset into long table
|
|
else
|
|
ulCode >>= 6; // it's a short code, use first 6 bits only
|
|
ucHuff = pucFast[ulCode];
|
|
cCoeff = (signed char)pucFast[ulCode+512]; // get pre-calculated extra bits for "small" values
|
|
if (ucHuff == 0) // invalid code
|
|
return -1;
|
|
ulBitOff += (ucHuff >> 4); // add the Huffman length
|
|
ucHuff &= 0xf; // get the actual code (SSSS)
|
|
if (ucHuff) // if there is a change to the DC value
|
|
{ // get the 'extra' bits
|
|
if (cCoeff)
|
|
{
|
|
(*iDCPredictor) += cCoeff;
|
|
}
|
|
else
|
|
{
|
|
if (ulBitOff > (REGISTER_WIDTH - 17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
ulCode = ulBits << ulBitOff;
|
|
ulTemp = ~(uint32_t)(((int32_t)ulCode)>>31); // slide sign bit across other 31 bits
|
|
ulCode >>= (REGISTER_WIDTH - ucHuff);
|
|
ulCode -= ulTemp>>(REGISTER_WIDTH-ucHuff);
|
|
ulBitOff += ucHuff; // add bit length
|
|
(*iDCPredictor) += (int)ulCode;
|
|
}
|
|
}
|
|
pMCU[0] = (short)*iDCPredictor; // store in MCU[0]
|
|
// Now get the other 63 AC coefficients
|
|
pFast = &pJPEG->usHuffAC[pJPEG->ucACTable * HUFF11SIZE];
|
|
if (pJPEG->b11Bit) // 11-bit "slow" tables used
|
|
{
|
|
// if (pJPEG->pHuffACFast == pJPEG->huffacFast[1]) // second table
|
|
// pFast = &pJPEG->ucAltHuff[0];
|
|
while (pZig < pEnd)
|
|
{
|
|
if (ulBitOff >(REGISTER_WIDTH - 17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
ulCode = (ulBits >> (REGISTER_WIDTH - 16 - ulBitOff)) & 0xffff; // get as lower 16 bits
|
|
if (ulCode >= 0xf000) // first 4 bits = 1, use long table
|
|
ulCode = (ulCode & 0x1fff);
|
|
else
|
|
ulCode >>= 4; // use lower 12 bits (short table)
|
|
usHuff = pFast[ulCode];
|
|
if (usHuff == 0) // invalid code
|
|
return -1;
|
|
ulBitOff += (usHuff >> 8); // add length
|
|
usHuff &= 0xff; // get code (RRRR/SSSS)
|
|
if (usHuff == 0) // no more AC components
|
|
{
|
|
goto mcu_done;
|
|
}
|
|
if (ulBitOff > (REGISTER_WIDTH - 17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
pZig += (usHuff >> 4); // get the skip amount (RRRR)
|
|
usHuff &= 0xf; // get (SSSS) - extra length
|
|
if (pZig < pEnd && usHuff) // && piHisto)
|
|
{
|
|
ulCode = ulBits << ulBitOff;
|
|
ulTemp = ~(uint32_t) (((int32_t) ulCode) >> (REGISTER_WIDTH-1)); // slide sign bit across other 63 bits
|
|
ulCode >>= (REGISTER_WIDTH - usHuff);
|
|
ulCode -= ulTemp >> (REGISTER_WIDTH - usHuff);
|
|
ucMaxACCol |= 1<<(*pZig & 7); // keep track of occupied columns
|
|
if (*pZig >= 0x20) // if more than 4 rows used in a col, mark it
|
|
ucMaxACRow |= 1<<(*pZig & 7); // keep track of the max AC term row
|
|
pMCU[*pZig] = (signed short)ulCode; // store AC coefficient (already reordered)
|
|
}
|
|
ulBitOff += usHuff; // add (SSSS) extra length
|
|
pZig++;
|
|
} // while
|
|
}
|
|
else // 10-bit "fast" tables used
|
|
{
|
|
while (pZig < pEnd)
|
|
{
|
|
if (ulBitOff >(REGISTER_WIDTH - 17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
ulCode = (ulBits >> (REGISTER_WIDTH - 16 - ulBitOff)) & 0xffff; // get as lower 16 bits
|
|
if (ulCode >= 0xfc00) // first 6 bits = 1, use long table
|
|
ulCode = (ulCode & 0x7ff); // (ulCode & 0x3ff) + 0x400;
|
|
else
|
|
ulCode >>= 6; // use lower 10 bits (short table)
|
|
usHuff = pFast[ulCode];
|
|
if (usHuff == 0) // invalid code
|
|
return -1;
|
|
ulBitOff += (usHuff >> 8); // add length
|
|
usHuff &= 0xff; // get code (RRRR/SSSS)
|
|
if (usHuff == 0) // no more AC components
|
|
{
|
|
goto mcu_done;
|
|
}
|
|
if (ulBitOff >(REGISTER_WIDTH - 17)) // need to get more data
|
|
{
|
|
pBuf += (ulBitOff >> 3);
|
|
ulBitOff &= 7;
|
|
ulBits = MOTOLONG(pBuf);
|
|
}
|
|
pZig += (usHuff >> 4); // get the skip amount (RRRR)
|
|
usHuff &= 0xf; // get (SSSS) - extra length
|
|
if (pZig < pEnd2 && usHuff)
|
|
{
|
|
ulCode = ulBits << ulBitOff;
|
|
ulTemp = ~(uint32_t) (((int32_t) ulCode) >> (REGISTER_WIDTH-1)); // slide sign bit across other 63 bits
|
|
ulCode >>= (REGISTER_WIDTH - usHuff);
|
|
ulCode -= ulTemp >> (REGISTER_WIDTH - usHuff);
|
|
ucMaxACCol |= 1<<(*pZig & 7); // keep track of occupied columns
|
|
if (*pZig >= 0x20) // if more than 4 rows used in a col, mark it
|
|
ucMaxACRow |= 1<<(*pZig & 7); // keep track of the max AC term row
|
|
pMCU[*pZig] = (signed short)ulCode; // store AC coefficient (already reordered)
|
|
}
|
|
ulBitOff += usHuff; // add (SSSS) extra length
|
|
pZig++;
|
|
} // while
|
|
} // 10-bit tables
|
|
mcu_done:
|
|
pJPEG->bb.pBuf = pBuf;
|
|
pJPEG->iVLCOff = (int)(pBuf - pJPEG->ucFileBuf);
|
|
pJPEG->bb.ulBitOff = ulBitOff;
|
|
pJPEG->bb.ulBits = ulBits;
|
|
pJPEG->ucMaxACCol = ucMaxACCol;
|
|
pJPEG->ucMaxACRow = ucMaxACRow; // DEBUG
|
|
return 0;
|
|
} /* JPEGDecodeMCU() */
|
|
//
|
|
// Inverse DCT
|
|
//
|
|
static void JPEGIDCT(JPEGIMAGE *pJPEG, int iMCUOffset, int iQuantTable, int iACFlags)
|
|
{
|
|
int iRow;
|
|
unsigned char ucColMask;
|
|
int iCol;
|
|
signed int tmp6,tmp7,tmp10,tmp11,tmp12,tmp13;
|
|
signed int z5,z10,z11,z12,z13;
|
|
signed int tmp0,tmp1,tmp2,tmp3,tmp4,tmp5;
|
|
signed short *pQuant;
|
|
unsigned char *pOutput;
|
|
unsigned char ucMaxACRow, ucMaxACCol;
|
|
int16_t *pMCUSrc = &pJPEG->sMCUs[iMCUOffset];
|
|
|
|
ucMaxACRow = (unsigned char)(iACFlags >> 8);
|
|
ucMaxACCol = iACFlags & 0xff;
|
|
|
|
// my shortcut method appears to violate patent 20020080052
|
|
// but the patent is invalidated by prior art:
|
|
// http://netilium.org/~mad/dtj/DTJ/DTJK04/
|
|
pQuant = &pJPEG->sQuantTable[iQuantTable * DCTSIZE];
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER) // special case
|
|
{
|
|
/* Column 0 */
|
|
tmp4 = pMCUSrc[0] * pQuant[0];
|
|
tmp5 = pMCUSrc[8] * pQuant[8];
|
|
tmp0 = tmp4 + tmp5;
|
|
tmp2 = tmp4 - tmp5;
|
|
/* Column 1 */
|
|
tmp4 = pMCUSrc[1] * pQuant[1];
|
|
tmp5 = pMCUSrc[9] * pQuant[9];
|
|
tmp1 = tmp4 + tmp5;
|
|
tmp3 = tmp4 - tmp5;
|
|
/* Pass 2: process 2 rows, store into output array. */
|
|
/* Row 0 */
|
|
pOutput = (unsigned char *)pMCUSrc; // store output pixels back into MCU
|
|
pOutput[0] = ucRangeTable[(((tmp0 + tmp1)>>5) & 0x3ff)];
|
|
pOutput[1] = ucRangeTable[(((tmp0 - tmp1)>>5) & 0x3ff)];
|
|
/* Row 1 */
|
|
pOutput[2] = ucRangeTable[(((tmp2 + tmp3)>>5) & 0x3ff)];
|
|
pOutput[3] = ucRangeTable[(((tmp2 - tmp3)>>5) & 0x3ff)];
|
|
return;
|
|
}
|
|
// do columns first
|
|
ucColMask = ucMaxACCol | 1; // column 0 must always be calculated
|
|
for (iCol = 0; iCol < 8 && ucColMask; iCol++)
|
|
{
|
|
if (ucColMask & (1<<iCol)) // column has data in it
|
|
{
|
|
ucColMask &= ~(1<<iCol); // unmark this col after use
|
|
if (!(ucMaxACRow & (1<<iCol))) // simpler calculations if only half populated
|
|
{
|
|
// even part
|
|
tmp10 = pMCUSrc[iCol] * pQuant[iCol];
|
|
tmp1 = pMCUSrc[iCol+16] * pQuant[iCol+16]; // get 2nd row
|
|
tmp12 = ((tmp1*106)>>8); // used to be 362 - 1 (256)
|
|
tmp0 = tmp10 + tmp1;
|
|
tmp3 = tmp10 - tmp1;
|
|
tmp1 = tmp10 + tmp12;
|
|
tmp2 = tmp10 - tmp12;
|
|
// odd part
|
|
tmp4 = pMCUSrc[iCol+8] * pQuant[iCol+8]; // get 1st row
|
|
tmp5 = pMCUSrc[iCol+24];
|
|
if (tmp5) // this value is usually 0
|
|
{
|
|
tmp5 *= pQuant[iCol+24]; // get 3rd row
|
|
tmp7 = tmp4 + tmp5;
|
|
tmp11 = (((tmp4 - tmp5) * 362) >> 8); // 362>>8 = 1.414213562
|
|
z5 = (((tmp4-tmp5) * 473) >> 8); // 473>>8 = 1.8477
|
|
tmp12 = ((-tmp5 * -669)>>8) + z5; // -669>>8 = -2.6131259
|
|
tmp6 = tmp12 - tmp7;
|
|
tmp5 = tmp11 - tmp6;
|
|
tmp10 = ((tmp4 * 277)>>8) - z5; // 277>>8 = 1.08239
|
|
tmp4 = tmp10 + tmp5;
|
|
}
|
|
else // simpler case when we only have 1 odd row to calculate
|
|
{
|
|
tmp7 = tmp4;
|
|
tmp5 = (145*tmp4) >> 8;
|
|
tmp6 = (217*tmp4) >> 8;
|
|
tmp4 = (-51*tmp4) >> 8;
|
|
}
|
|
pMCUSrc[iCol] = (short)(tmp0 + tmp7); // row0
|
|
pMCUSrc[iCol+8] = (short)(tmp1 + tmp6); // row 1
|
|
pMCUSrc[iCol+16] = (short)(tmp2 + tmp5); // row 2
|
|
pMCUSrc[iCol+24] = (short)(tmp3 - tmp4); // row 3
|
|
pMCUSrc[iCol+32] = (short)(tmp3 + tmp4); // row 4
|
|
pMCUSrc[iCol+40] = (short)(tmp2 - tmp5); // row 5
|
|
pMCUSrc[iCol+48] = (short)(tmp1 - tmp6); // row 6
|
|
pMCUSrc[iCol+56] = (short)(tmp0 - tmp7); // row 7
|
|
}
|
|
else // need to do full column calculation
|
|
{
|
|
// even part
|
|
tmp0 = pMCUSrc[iCol] * pQuant[iCol];
|
|
tmp2 = pMCUSrc[iCol+32]; // get 4th row
|
|
if (tmp2) // 4th row is most likely 0
|
|
{
|
|
tmp2 = tmp2 * pQuant[iCol+32];
|
|
tmp10 = tmp0 + tmp2;
|
|
tmp11 = tmp0 - tmp2;
|
|
}
|
|
else
|
|
{
|
|
tmp10 = tmp11 = tmp0;
|
|
}
|
|
tmp1 = pMCUSrc[iCol+16] * pQuant[iCol+16]; // get 2nd row
|
|
tmp3 = pMCUSrc[iCol+48]; // get 6th row
|
|
if (tmp3) // 6th row is most likely 0
|
|
{
|
|
tmp3 = tmp3 * pQuant[iCol+48];
|
|
tmp13 = tmp1 + tmp3;
|
|
tmp12 = (((tmp1 - tmp3) * 362) >> 8) - tmp13; // 362>>8 = 1.414213562
|
|
}
|
|
else
|
|
{
|
|
tmp13 = tmp1;
|
|
tmp12 = ((tmp1*362)>>8) - tmp1;
|
|
}
|
|
tmp0 = tmp10 + tmp13;
|
|
tmp3 = tmp10 - tmp13;
|
|
tmp1 = tmp11 + tmp12;
|
|
tmp2 = tmp11 - tmp12;
|
|
// odd part
|
|
tmp5 = pMCUSrc[iCol+24] * pQuant[iCol+24]; // get 3rd row
|
|
tmp6 = pMCUSrc[iCol+40]; // get 5th row
|
|
if (tmp6) // very likely that row 5 = 0
|
|
{
|
|
tmp6 = tmp6 * pQuant[iCol+40];
|
|
z13 = tmp6 + tmp5;
|
|
z10 = tmp6 - tmp5;
|
|
}
|
|
else
|
|
{
|
|
z13 = tmp5;
|
|
z10 = -tmp5;
|
|
}
|
|
tmp4 = pMCUSrc[iCol+8] * pQuant[iCol+8]; // get 1st row
|
|
tmp7 = pMCUSrc[iCol+56]; // get 7th row
|
|
if (tmp7) // very likely that row 7 = 0
|
|
{
|
|
tmp7 = tmp7 * pQuant[iCol+56];
|
|
z11 = tmp4 + tmp7;
|
|
z12 = tmp4 - tmp7;
|
|
}
|
|
else
|
|
{
|
|
z11 = z12 = tmp4;
|
|
}
|
|
tmp7 = z11 + z13;
|
|
tmp11 = (((z11 - z13) * 362) >> 8); // 362>>8 = 1.414213562
|
|
z5 = (((z10 + z12) * 473) >> 8); // 473>>8 = 1.8477
|
|
tmp12 = ((z10 * -669)>>8) + z5; // -669>>8 = -2.6131259
|
|
tmp6 = tmp12 - tmp7;
|
|
tmp5 = tmp11 - tmp6;
|
|
tmp10 = ((z12 * 277)>>8) - z5; // 277>>8 = 1.08239
|
|
tmp4 = tmp10 + tmp5;
|
|
pMCUSrc[iCol] = (short)(tmp0 + tmp7); // row0
|
|
pMCUSrc[iCol+8] = (short)(tmp1 + tmp6); // row 1
|
|
pMCUSrc[iCol+16] = (short)(tmp2 + tmp5); // row 2
|
|
pMCUSrc[iCol+24] = (short)(tmp3 - tmp4); // row 3
|
|
pMCUSrc[iCol+32] = (short)(tmp3 + tmp4); // row 4
|
|
pMCUSrc[iCol+40] = (short)(tmp2 - tmp5); // row 5
|
|
pMCUSrc[iCol+48] = (short)(tmp1 - tmp6); // row 6
|
|
pMCUSrc[iCol+56] = (short)(tmp0 - tmp7); // row 7
|
|
} // full calculation needed
|
|
} // if column has data in it
|
|
} // for each column
|
|
// now do rows
|
|
pOutput = (unsigned char *)pMCUSrc; // store output pixels back into MCU
|
|
for (iRow=0; iRow<64; iRow+=8) // all rows must be calculated
|
|
{
|
|
// even part
|
|
if (ucMaxACCol < 0x10) // quick and dirty calculation (right 4 columns are all 0's)
|
|
{
|
|
if (ucMaxACCol < 0x04) // very likely case (1 or 2 columns occupied)
|
|
{
|
|
// even part
|
|
tmp0 = tmp1 = tmp2 = tmp3 = pMCUSrc[iRow+0];
|
|
// odd part
|
|
tmp7 = pMCUSrc[iRow+1];
|
|
tmp6 = (tmp7 * 217)>>8; // * 0.8477
|
|
tmp5 = (tmp7 * 145)>>8; // * 0.5663
|
|
tmp4 = -((tmp7 * 51)>>8); // * -0.199
|
|
}
|
|
else
|
|
{
|
|
tmp10 = pMCUSrc[iRow+0];
|
|
tmp13 = pMCUSrc[iRow+2];
|
|
tmp12 = ((tmp13 * 106)>>8); // 2-6 * 1.414
|
|
tmp0 = tmp10 + tmp13;
|
|
tmp3 = tmp10 - tmp13;
|
|
tmp1 = tmp10 + tmp12;
|
|
tmp2 = tmp10 - tmp12;
|
|
// odd part
|
|
z13 = pMCUSrc[iRow+3];
|
|
z11 = pMCUSrc[iRow+1];
|
|
tmp7 = z11 + z13;
|
|
tmp11 = ((z11 - z13)*362)>>8; // * 1.414
|
|
z5 = ((z11 - z13)*473)>>8; // * 1.8477
|
|
tmp10 = ((z11*277)>>8) - z5; // * 1.08239
|
|
tmp12 = ((z13*669)>>8) + z5; // * 2.61312
|
|
tmp6 = tmp12 - tmp7;
|
|
tmp5 = tmp11 - tmp6;
|
|
tmp4 = tmp10 + tmp5;
|
|
}
|
|
}
|
|
else // need to do the full calculation
|
|
{
|
|
tmp10 = pMCUSrc[iRow+0] + pMCUSrc[iRow+4];
|
|
tmp11 = pMCUSrc[iRow+0] - pMCUSrc[iRow+4];
|
|
tmp13 = pMCUSrc[iRow+2] + pMCUSrc[iRow+6];
|
|
tmp12 = (((pMCUSrc[iRow+2] - pMCUSrc[iRow+6]) * 362)>>8) - tmp13; // 2-6 * 1.414
|
|
tmp0 = tmp10 + tmp13;
|
|
tmp3 = tmp10 - tmp13;
|
|
tmp1 = tmp11 + tmp12;
|
|
tmp2 = tmp11 - tmp12;
|
|
// odd part
|
|
z13 = pMCUSrc[iRow+5] + pMCUSrc[iRow+3];
|
|
z10 = pMCUSrc[iRow+5] - pMCUSrc[iRow+3];
|
|
z11 = pMCUSrc[iRow+1] + pMCUSrc[iRow+7];
|
|
z12 = pMCUSrc[iRow+1] - pMCUSrc[iRow+7];
|
|
tmp7 = z11 + z13;
|
|
tmp11 = ((z11 - z13)*362)>>8; // * 1.414
|
|
z5 = ((z10 + z12)*473)>>8; // * 1.8477
|
|
tmp10 = ((z12*277)>>8) - z5; // * 1.08239
|
|
tmp12 = ((z10*-669)>>8) + z5; // * 2.61312
|
|
tmp6 = tmp12 - tmp7;
|
|
tmp5 = tmp11 - tmp6;
|
|
tmp4 = tmp10 + tmp5;
|
|
}
|
|
// final output stage - scale down and range limit
|
|
pOutput[0] = ucRangeTable[(((tmp0 + tmp7)>>5) & 0x3ff)];
|
|
pOutput[1] = ucRangeTable[(((tmp1 + tmp6)>>5) & 0x3ff)];
|
|
pOutput[2] = ucRangeTable[(((tmp2 + tmp5)>>5) & 0x3ff)];
|
|
pOutput[3] = ucRangeTable[(((tmp3 - tmp4)>>5) & 0x3ff)];
|
|
pOutput[4] = ucRangeTable[(((tmp3 + tmp4)>>5) & 0x3ff)];
|
|
pOutput[5] = ucRangeTable[(((tmp2 - tmp5)>>5) & 0x3ff)];
|
|
pOutput[6] = ucRangeTable[(((tmp1 - tmp6)>>5) & 0x3ff)];
|
|
pOutput[7] = ucRangeTable[(((tmp0 - tmp7)>>5) & 0x3ff)];
|
|
pOutput += 8;
|
|
} // for each row
|
|
} /* JPEGIDCT() */
|
|
static void JPEGPutMCU8BitGray(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
int i, j, xcount, ycount;
|
|
uint8_t *pDest, *pSrc = (uint8_t *)&pJPEG->sMCUs[0];
|
|
|
|
if (pJPEG->pDitherBuffer)
|
|
pDest = &pJPEG->pDitherBuffer[x];
|
|
else
|
|
pDest = (uint8_t *)&pJPEG->usPixels[x/2];
|
|
|
|
if (pJPEG->ucSubSample <= 0x11) // single Y
|
|
{
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF) // special handling of 1/2 size (pixel averaging)
|
|
{
|
|
int pix;
|
|
for (i=0; i<4; i++)
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
pix = (pSrc[0] + pSrc[1] + pSrc[8] + pSrc[9] + 2) >> 2; // average 2x2 block
|
|
pDest[j] = (uint8_t)pix;
|
|
pSrc += 2;
|
|
}
|
|
pSrc += 8; // skip extra line
|
|
pDest += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
xcount = ycount = 8; // debug
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
xcount = ycount = 2;
|
|
else if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
xcount = ycount = 1;
|
|
for (i=0; i<ycount; i++) // do up to 8 rows
|
|
{
|
|
for (j=0; j<xcount; j++)
|
|
*pDest++ = *pSrc++;
|
|
pDest -= xcount;
|
|
pDest += iPitch; // next line
|
|
}
|
|
return;
|
|
} // single Y source
|
|
if (pJPEG->ucSubSample == 0x21) // stacked horizontally
|
|
{
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
// only 2 pixels emitted
|
|
pDest[0] = pSrc[0];
|
|
pDest[1] = pSrc[128];
|
|
return;
|
|
} /* 1/8 */
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (i=0; i<4; i++)
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
int pix;
|
|
pix = (pSrc[j*2] + pSrc[j*2+1] + pSrc[j*2 + 8] + pSrc[j*2 + 9] + 2) >> 2;
|
|
pDest[j] = (uint8_t)pix;
|
|
pix = (pSrc[j*2 + 128] + pSrc[j*2+129] + pSrc[j*2 + 136] + pSrc[j*2 + 137] + 2) >> 2;
|
|
pDest[j+4] = (uint8_t)pix;
|
|
}
|
|
pSrc += 16;
|
|
pDest += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{
|
|
// each MCU contributes a 2x2 block
|
|
pDest[0] = pSrc[0]; // Y0
|
|
pDest[1] = pSrc[1];
|
|
pDest[iPitch] = pSrc[2];
|
|
pDest[iPitch+1] = pSrc[3];
|
|
|
|
pDest[2] = pSrc[128]; // Y`
|
|
pDest[3] = pSrc[129];
|
|
pDest[iPitch+2] = pSrc[130];
|
|
pDest[iPitch+3] = pSrc[131];
|
|
return;
|
|
}
|
|
for (i=0; i<8; i++)
|
|
{
|
|
for (j=0; j<8; j++)
|
|
{
|
|
pDest[j] = pSrc[j];
|
|
pDest[j+8] = pSrc[128 + j];
|
|
}
|
|
pSrc += 8;
|
|
pDest += iPitch;
|
|
}
|
|
} // 0x21
|
|
if (pJPEG->ucSubSample == 0x12) // stacked vertically
|
|
{
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
// only 2 pixels emitted
|
|
pDest[0] = pSrc[0];
|
|
pDest[iPitch] = pSrc[128];
|
|
return;
|
|
} /* 1/8 */
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (i=0; i<4; i++)
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
int pix;
|
|
pix = (pSrc[j*2] + pSrc[j*2+1] + pSrc[j*2 + 8] + pSrc[j*2 + 9] + 2) >> 2;
|
|
pDest[j] = (uint8_t)pix;
|
|
pix = (pSrc[j*2 + 128] + pSrc[j*2+129] + pSrc[j*2 + 136] + pSrc[j*2 + 137] + 2) >> 2;
|
|
pDest[4*iPitch+j] = (uint8_t)pix;
|
|
}
|
|
pSrc += 16;
|
|
pDest += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{
|
|
// each MCU contributes a 2x2 block
|
|
pDest[0] = pSrc[0]; // Y0
|
|
pDest[1] = pSrc[1];
|
|
pDest[iPitch] = pSrc[2];
|
|
pDest[iPitch+1] = pSrc[3];
|
|
|
|
pDest[iPitch*2] = pSrc[128]; // Y`
|
|
pDest[iPitch*2+1] = pSrc[129];
|
|
pDest[iPitch*3] = pSrc[130];
|
|
pDest[iPitch*3+1] = pSrc[131];
|
|
return;
|
|
}
|
|
for (i=0; i<8; i++)
|
|
{
|
|
for (j=0; j<8; j++)
|
|
{
|
|
pDest[j] = pSrc[j];
|
|
pDest[8*iPitch + j] = pSrc[128 + j];
|
|
}
|
|
pSrc += 8;
|
|
pDest += iPitch;
|
|
}
|
|
} // 0x12
|
|
if (pJPEG->ucSubSample == 0x22)
|
|
{
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
// each MCU contributes 1 pixel
|
|
pDest[0] = pSrc[0]; // Y0
|
|
pDest[1] = pSrc[128]; // Y1
|
|
pDest[iPitch] = pSrc[256]; // Y2
|
|
pDest[iPitch + 1] = pSrc[384]; // Y3
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{
|
|
// each MCU contributes 2x2 pixels
|
|
pDest[0] = pSrc[0]; // Y0
|
|
pDest[1] = pSrc[1];
|
|
pDest[iPitch] = pSrc[2];
|
|
pDest[iPitch+1] = pSrc[3];
|
|
|
|
pDest[2] = pSrc[128]; // Y1
|
|
pDest[3] = pSrc[129];
|
|
pDest[iPitch+2] = pSrc[130];
|
|
pDest[iPitch+3] = pSrc[131];
|
|
|
|
pDest[iPitch*2] = pSrc[256]; // Y2
|
|
pDest[iPitch*2+1] = pSrc[257];
|
|
pDest[iPitch*3] = pSrc[258];
|
|
pDest[iPitch*3+1] = pSrc[259];
|
|
|
|
pDest[iPitch*2+2] = pSrc[384]; // Y3
|
|
pDest[iPitch*2+3] = pSrc[385];
|
|
pDest[iPitch*3+2] = pSrc[386];
|
|
pDest[iPitch*3+3] = pSrc[387];
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (i=0; i<4; i++)
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
int pix;
|
|
pix = (pSrc[j*2] + pSrc[j*2+1] + pSrc[j*2 + 8] + pSrc[j*2 + 9] + 2) >> 2;
|
|
pDest[j] = (uint8_t)pix; // Y0
|
|
pix = (pSrc[j*2+128] + pSrc[j*2+129] + pSrc[j*2 + 136] + pSrc[j*2 + 137] + 2) >> 2;
|
|
pDest[j+4] = (uint8_t)pix; // Y1
|
|
pix = (pSrc[j*2+256] + pSrc[j*2+257] + pSrc[j*2 + 264] + pSrc[j*2 + 265] + 2) >> 2;
|
|
pDest[iPitch*4 + j] = (uint8_t)pix; // Y2
|
|
pix = (pSrc[j*2+384] + pSrc[j*2+385] + pSrc[j*2 + 392] + pSrc[j*2 + 393] + 2) >> 2;
|
|
pDest[iPitch*4 + j + 4] = (uint8_t)pix; // Y3
|
|
}
|
|
pSrc += 16;
|
|
pDest += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
for (i=0; i<8; i++)
|
|
{
|
|
for (j=0; j<8; j++)
|
|
{
|
|
pDest[j] = pSrc[j]; // Y0
|
|
pDest[j+8] = pSrc[j+128]; // Y1
|
|
pDest[iPitch*8 + j] = pSrc[j+256]; // Y2
|
|
pDest[iPitch*8 + j + 8] = pSrc[j + 384]; // Y3
|
|
}
|
|
pSrc += 8;
|
|
pDest += iPitch;
|
|
}
|
|
} // 0x22
|
|
} /* JPEGMPutMCU8BitGray() */
|
|
|
|
static void JPEGPutMCUGray(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
uint16_t *usDest = (uint16_t *)&pJPEG->usPixels[x];
|
|
int i, j, xcount, ycount;
|
|
uint8_t *pSrc = (uint8_t *)&pJPEG->sMCUs[0];
|
|
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF) // special handling of 1/2 size (pixel averaging)
|
|
{
|
|
int pix;
|
|
for (i=0; i<4; i++)
|
|
{
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
pix = (pSrc[0] + pSrc[1] + pSrc[8] + pSrc[9] + 2) >> 2; // average 2x2 block
|
|
usDest[j] = usGrayTo565[pix];
|
|
pSrc += 2;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (j=0; j<4; j++)
|
|
{
|
|
pix = (pSrc[0] + pSrc[1] + pSrc[8] + pSrc[9] + 2) >> 2; // average 2x2 block
|
|
usDest[j] = __builtin_bswap16(usGrayTo565[pix]);
|
|
pSrc += 2;
|
|
}
|
|
}
|
|
pSrc += 8; // skip extra line
|
|
usDest += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
xcount = ycount = 8; // debug
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
xcount = ycount = 2;
|
|
else if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
xcount = ycount = 1;
|
|
for (i=0; i<ycount; i++) // do up to 8 rows
|
|
{
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
for (j=0; j<xcount; j++)
|
|
*usDest++ = usGrayTo565[*pSrc++];
|
|
}
|
|
else
|
|
{
|
|
for (j=0; j<xcount; j++)
|
|
*usDest++ = __builtin_bswap16(usGrayTo565[*pSrc++]);
|
|
}
|
|
usDest -= xcount;
|
|
usDest += iPitch; // next line
|
|
}
|
|
} /* JPEGPutMCUGray() */
|
|
|
|
static void JPEGPixelLE(uint16_t *pDest, int iY, int iCb, int iCr)
|
|
{
|
|
//
|
|
// Cortex-M4/M7 has some SIMD instructions which can shave a few cycles
|
|
// off of this function (e.g. Teensy, Arduino Nano 33 BLE, Portenta, etc)
|
|
//
|
|
#ifdef HAS_SIMD
|
|
uint32_t ulPixel;
|
|
uint32_t ulCbCr = (iCb | (iCr << 16));
|
|
uint32_t ulTmp = -1409 | (-2925 << 16); // for green calc
|
|
ulCbCr = __SSUB16(ulCbCr, 0x00800080); // dual 16-bit subtraction
|
|
ulPixel = __SMLAD(ulCbCr, ulTmp, iY) >> 14; // G
|
|
ulPixel = __USAT16(ulPixel, 6) << 5; // range limit to 6 bits
|
|
ulTmp = __SMLAD(7258, ulCbCr, iY) >> 15; // Blue
|
|
ulTmp = __USAT16(ulTmp, 5); // range limit to 5 bits
|
|
ulPixel |= ulTmp; // now we have G + B
|
|
ulTmp = __SMLAD(5742, ulCbCr >> 16, iY) >> 15; // Red
|
|
ulTmp = __USAT16(ulTmp, 5); // range limit to 5 bits
|
|
ulPixel |= (ulTmp << 11); // now we have R + G + B
|
|
pDest[0] = (uint16_t)ulPixel;
|
|
#else
|
|
int iCBB, iCBG, iCRG, iCRR;
|
|
unsigned short usPixel;
|
|
|
|
iCBB = 7258 * (iCb-0x80);
|
|
iCBG = -1409 * (iCb-0x80);
|
|
iCRG = -2925 * (iCr-0x80);
|
|
iCRR = 5742 * (iCr-0x80);
|
|
usPixel = usRangeTableB[((iCBB + iY) >> 15) & 0x7f]; // blue pixel
|
|
usPixel |= usRangeTableG[((iCBG + iCRG + iY) >> 14) & 0xff]; // green pixel
|
|
usPixel |= usRangeTableR[((iCRR + iY) >> 15) & 0x7f]; // red pixel
|
|
pDest[0] = usPixel;
|
|
#endif
|
|
} /* JPEGPixelLE() */
|
|
|
|
static void JPEGPixelBE(uint16_t *pDest, int iY, int iCb, int iCr)
|
|
{
|
|
int iCBB, iCBG, iCRG, iCRR;
|
|
unsigned short usPixel;
|
|
|
|
iCBB = 7258 * (iCb-0x80);
|
|
iCBG = -1409 * (iCb-0x80);
|
|
iCRG = -2925 * (iCr-0x80);
|
|
iCRR = 5742 * (iCr-0x80);
|
|
usPixel = usRangeTableB[((iCBB + iY) >> 15) & 0x7f]; // blue pixel
|
|
usPixel |= usRangeTableG[((iCBG + iCRG + iY) >> 14) & 0xff]; // green pixel
|
|
usPixel |= usRangeTableR[((iCRR + iY) >> 15) & 0x7f]; // red pixel
|
|
pDest[0] = __builtin_bswap16(usPixel);
|
|
} /* JPEGPixelBE() */
|
|
|
|
static void JPEGPixel2LE(uint16_t *pDest, int iY1, int iY2, int iCb, int iCr)
|
|
{
|
|
uint32_t ulPixel1, ulPixel2;
|
|
//
|
|
// Cortex-M4/M7 has some SIMD instructions which can shave a few cycles
|
|
// off of this function (e.g. Teensy, Arduino Nano 33 BLE, Portenta, etc)
|
|
//
|
|
#ifdef HAS_SIMD
|
|
uint32_t ulCbCr = (iCb | (iCr << 16));
|
|
uint32_t ulTmp2, ulTmp = -1409 | (-2925 << 16); // for green calc
|
|
ulCbCr = __SSUB16(ulCbCr, 0x00800080); // dual 16-bit subtraction
|
|
ulPixel1 = __SMLAD(ulCbCr, ulTmp, iY1) >> 14; // G for pixel 1
|
|
ulPixel2 = __SMLAD(ulCbCr, ulTmp, iY2) >> 14; // G for pixel 2
|
|
ulPixel1 |= (ulPixel2 << 16);
|
|
ulPixel1 = __USAT16(ulPixel1, 6) << 5; // range limit both to 6 bits
|
|
ulTmp = __SMLAD(7258, ulCbCr, iY1) >> 15; // Blue 1
|
|
ulTmp2 = __SMLAD(7258, ulCbCr, iY2) >> 15; // Blue 2
|
|
ulTmp = __USAT16(ulTmp | (ulTmp2 << 16), 5); // range limit both to 5 bits
|
|
ulPixel1 |= ulTmp; // now we have G + B
|
|
ulTmp = __SMLAD(5742, ulCbCr >> 16, iY1) >> 15; // Red 1
|
|
ulTmp2 = __SMLAD(5742, ulCbCr >> 16, iY2) >> 15; // Red 2
|
|
ulTmp = __USAT16(ulTmp | (ulTmp2 << 16), 5); // range limit both to 5 bits
|
|
ulPixel1 |= (ulTmp << 11); // now we have R + G + B
|
|
*(uint32_t *)&pDest[0] = ulPixel1;
|
|
#else
|
|
int iCBB, iCBG, iCRG, iCRR;
|
|
iCBB = 7258 * (iCb-0x80);
|
|
iCBG = -1409 * (iCb-0x80);
|
|
iCRG = -2925 * (iCr-0x80);
|
|
iCRR = 5742 * (iCr-0x80);
|
|
ulPixel1 = usRangeTableB[((iCBB + iY1) >> 15) & 0x7f]; // blue pixel
|
|
ulPixel1 |= usRangeTableG[((iCBG + iCRG + iY1) >> 14) & 0xff]; // green pixel
|
|
ulPixel1 |= usRangeTableR[((iCRR + iY1) >> 15) & 0x7f]; // red pixel
|
|
|
|
ulPixel2 = usRangeTableB[((iCBB + iY2) >> 15) & 0x7f]; // blue pixel
|
|
ulPixel2 |= usRangeTableG[((iCBG + iCRG + iY2) >> 14) & 0xff]; // green pixel
|
|
ulPixel2 |= usRangeTableR[((iCRR + iY2) >> 15) & 0x7f]; // red pixel
|
|
*(uint32_t *)&pDest[0] = (ulPixel1 | (ulPixel2<<16));
|
|
#endif
|
|
} /* JPEGPixel2LE() */
|
|
|
|
static void JPEGPixel2BE(uint16_t *pDest, int32_t iY1, int32_t iY2, int32_t iCb, int32_t iCr)
|
|
{
|
|
int32_t iCBB, iCBG, iCRG, iCRR;
|
|
uint32_t ulPixel1, ulPixel2;
|
|
|
|
iCBB = 7258L * (iCb-0x80);
|
|
iCBG = -1409L * (iCb-0x80);
|
|
iCRG = -2925L * (iCr-0x80);
|
|
iCRR = 5742L * (iCr-0x80);
|
|
ulPixel1 = usRangeTableB[((iCBB + iY1) >> 15) & 0x7f]; // blue pixel
|
|
ulPixel1 |= usRangeTableG[((iCBG + iCRG + iY1) >> 14) & 0xff]; // green pixel
|
|
ulPixel1 |= usRangeTableR[((iCRR + iY1) >> 15) & 0x7f]; // red pixel
|
|
|
|
ulPixel2 = usRangeTableB[((iCBB + iY2) >> 15) & 0x7f]; // blue pixel
|
|
ulPixel2 |= usRangeTableG[((iCBG + iCRG + iY2) >> 14) & 0xff]; // green pixel
|
|
ulPixel2 |= usRangeTableR[((iCRR + iY2) >> 15) & 0x7f]; // red pixel
|
|
*(uint32_t *)&pDest[0] = __builtin_bswap16(ulPixel1) | ((uint32_t)__builtin_bswap16(ulPixel2)<<16);
|
|
} /* JPEGPixel2BE() */
|
|
|
|
static void JPEGPixelLE888(uint8_t *pDest, int iY, int iCb, int iCr)
|
|
{
|
|
int32_t iCBB, iCBG, iCRG, iCRR;
|
|
uint32_t uVal;
|
|
|
|
iCBB = 7258 * (iCb-0x80);
|
|
iCBG = -1409 * (iCb-0x80);
|
|
iCRG = -2925 * (iCr-0x80);
|
|
iCRR = 5742 * (iCr-0x80);
|
|
|
|
// Red
|
|
uVal = ((iCRR + iY) >> 13) & 0x1FF;
|
|
if (uVal & 0x100) uVal = 0;
|
|
*pDest++ = uVal;
|
|
|
|
// Green
|
|
uVal = ((iCBG + iCRG + iY) >> 13) & 0x1FF;
|
|
if (uVal & 0x100) uVal = 0;
|
|
*pDest++ = uVal;
|
|
|
|
// Blue
|
|
uVal = ((iCBB + iY) >> 13) & 0x1FF;
|
|
if (uVal & 0x100) uVal = 0;
|
|
*pDest++ = uVal;
|
|
}
|
|
|
|
static void JPEGPutMCU11(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
int iCr, iCb;
|
|
signed int Y;
|
|
int iCol;
|
|
int iRow;
|
|
uint8_t *pY, *pCr, *pCb;
|
|
uint16_t *pOutput = &pJPEG->usPixels[x];
|
|
uint8_t *pOutput8 = ((uint8_t*)pJPEG->usPixels) + x * 3;
|
|
|
|
pY = (unsigned char *)&pJPEG->sMCUs[0*DCTSIZE];
|
|
pCb = (unsigned char *)&pJPEG->sMCUs[1*DCTSIZE];
|
|
pCr = (unsigned char *)&pJPEG->sMCUs[2*DCTSIZE];
|
|
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (iRow=0; iRow<4; iRow++) // up to 8 rows to do
|
|
{
|
|
for (iCol=0; iCol<4; iCol++) // up to 4x2 cols to do
|
|
{
|
|
iCr = (pCr[0] + pCr[1] + pCr[8] + pCr[9] + 2) >> 2;
|
|
iCb = (pCb[0] + pCb[1] + pCb[8] + pCb[9] + 2) >> 2;
|
|
Y = (pY[0] + pY[1] + pY[8] + pY[9]) << 10;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol, Y, iCb, iCr);
|
|
else
|
|
JPEGPixelBE(pOutput+iCol, Y, iCb, iCr);
|
|
pCr += 2;
|
|
pCb += 2;
|
|
pY += 2;
|
|
} // for col
|
|
pCr += 8;
|
|
pCb += 8;
|
|
pY += 8;
|
|
pOutput += iPitch;
|
|
} // for row
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH) // special case for 1/8 scaling
|
|
{
|
|
// only 4 pixels to draw, so no looping needed
|
|
iCr = pCr[0];
|
|
iCb = pCb[0];
|
|
Y = (int)(pY[0]) << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput, Y, iCb, iCr);
|
|
else
|
|
JPEGPixelBE(pOutput, Y, iCb, iCr);
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER) // special case for 1/4 scaling
|
|
{
|
|
// only 4 pixels to draw, so no looping needed
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE(pOutput, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE(pOutput+1, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE(pOutput+iPitch, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE(pOutput+1+iPitch, Y, iCb, iCr);
|
|
}
|
|
else
|
|
{
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelBE(pOutput, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelBE(pOutput+1, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelBE(pOutput+iPitch, Y, iCb, iCr);
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelBE(pOutput+1+iPitch, Y, iCb, iCr);
|
|
}
|
|
return;
|
|
}
|
|
for (iRow=0; iRow<8; iRow++) // up to 8 rows to do
|
|
{
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
for (iCol=0; iCol<8; iCol++) // up to 4x2 cols to do
|
|
{
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE(pOutput+iCol, Y, iCb, iCr);
|
|
} // for col
|
|
}
|
|
else if (pJPEG->ucPixelType == RGB888_LITTLE_ENDIAN)
|
|
{
|
|
for (iCol=0; iCol<8; iCol++) // up to 4x2 cols to do
|
|
{
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelLE888(pOutput8+iCol*3, Y, iCb, iCr);
|
|
} // for col
|
|
pOutput8 += iPitch * 3;
|
|
}
|
|
else
|
|
{
|
|
for (iCol=0; iCol<8; iCol++) // up to 4x2 cols to do
|
|
{
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y = (int)(*pY++) << 12;
|
|
JPEGPixelBE(pOutput+iCol, Y, iCb, iCr);
|
|
} // for col
|
|
}
|
|
pOutput += iPitch;
|
|
} // for row
|
|
} /* JPEGPutMCU11() */
|
|
|
|
static void JPEGPutMCU22(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
uint32_t Cr,Cb;
|
|
signed int Y1, Y2, Y3, Y4;
|
|
int iRow, iCol, iXCount1, iXCount2, iYCount;
|
|
unsigned char *pY, *pCr, *pCb;
|
|
int bUseOdd1, bUseOdd2; // special case where 24bpp odd sized image can clobber first column
|
|
uint16_t *pOutput = &pJPEG->usPixels[x];
|
|
|
|
pY = (unsigned char *)&pJPEG->sMCUs[0*DCTSIZE];
|
|
pCb = (unsigned char *)&pJPEG->sMCUs[4*DCTSIZE];
|
|
pCr = (unsigned char *)&pJPEG->sMCUs[5*DCTSIZE];
|
|
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF) // special handling of 1/2 size (pixel averaging)
|
|
{
|
|
for (iRow=0; iRow<4; iRow++) // 16x16 becomes 8x8 of 2x2 pixels
|
|
{
|
|
for (iCol=0; iCol<4; iCol++)
|
|
{
|
|
Y1 = (pY[iCol*2] + pY[iCol*2+1] + pY[iCol*2+8] + pY[iCol*2+9]) << 10;
|
|
Cb = pCb[iCol];
|
|
Cr = pCr[iCol];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol, Y1, Cb, Cr); // top left
|
|
else
|
|
JPEGPixelBE(pOutput+iCol, Y1, Cb, Cr);
|
|
Y1 = (pY[iCol*2+(DCTSIZE*2)] + pY[iCol*2+1+(DCTSIZE*2)] + pY[iCol*2+8+(DCTSIZE*2)] + pY[iCol*2+9+(DCTSIZE*2)]) << 10;
|
|
Cb = pCb[iCol+4];
|
|
Cr = pCr[iCol+4];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol+4, Y1, Cb, Cr); // top right
|
|
else
|
|
JPEGPixelBE(pOutput+iCol+4, Y1, Cb, Cr);
|
|
Y1 = (pY[iCol*2+(DCTSIZE*4)] + pY[iCol*2+1+(DCTSIZE*4)] + pY[iCol*2+8+(DCTSIZE*4)] + pY[iCol*2+9+(DCTSIZE*4)]) << 10;
|
|
Cb = pCb[iCol+32];
|
|
Cr = pCr[iCol+32];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol+iPitch*4, Y1, Cb, Cr); // bottom left
|
|
else
|
|
JPEGPixelBE(pOutput+iCol+iPitch*4, Y1, Cb, Cr);
|
|
Y1 = (pY[iCol*2+(DCTSIZE*6)] + pY[iCol*2+1+(DCTSIZE*6)] + pY[iCol*2+8+(DCTSIZE*6)] + pY[iCol*2+9+(DCTSIZE*6)]) << 10;
|
|
Cb = pCb[iCol+32+4];
|
|
Cr = pCr[iCol+32+4];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol+4+iPitch*4, Y1, Cb, Cr); // bottom right
|
|
else
|
|
JPEGPixelBE(pOutput+iCol+4+iPitch*4, Y1, Cb, Cr);
|
|
}
|
|
pY += 16;
|
|
pCb += 8;
|
|
pCr += 8;
|
|
pOutput += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
Y1 = pY[0] << 12; // scale to level of conversion table
|
|
Cb = pCb[0];
|
|
Cr = pCr[0];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput, Y1, Cb, Cr);
|
|
// top right block
|
|
Y1 = pY[DCTSIZE*2] << 12; // scale to level of conversion table
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput + 1, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput + 1, Y1, Cb, Cr);
|
|
// bottom left block
|
|
Y1 = pY[DCTSIZE*4] << 12; // scale to level of conversion table
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iPitch, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput+iPitch, Y1, Cb, Cr);
|
|
// bottom right block
|
|
Y1 = pY[DCTSIZE*6] << 12; // scale to level of conversion table
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+ 1 + iPitch, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput+ 1 + iPitch, Y1, Cb, Cr);
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER) // special case of 1/4
|
|
{
|
|
for (iRow=0; iRow<2; iRow++)
|
|
{
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
for (iCol=0; iCol<2; iCol++)
|
|
{
|
|
// top left block
|
|
Y1 = pY[iCol] << 12; // scale to level of conversion table
|
|
Cb = pCb[0];
|
|
Cr = pCr[0];
|
|
JPEGPixelLE(pOutput + iCol, Y1, Cb, Cr);
|
|
// top right block
|
|
Y1 = pY[iCol+(DCTSIZE*2)] << 12; // scale to level of conversion table
|
|
Cb = pCb[1];
|
|
Cr = pCr[1];
|
|
JPEGPixelLE(pOutput + 2+iCol, Y1, Cb, Cr);
|
|
// bottom left block
|
|
Y1 = pY[iCol+DCTSIZE*4] << 12; // scale to level of conversion table
|
|
Cb = pCb[2];
|
|
Cr = pCr[2];
|
|
JPEGPixelLE(pOutput+iPitch*2 + iCol, Y1, Cb, Cr);
|
|
// bottom right block
|
|
Y1 = pY[iCol+DCTSIZE*6] << 12; // scale to level of conversion table
|
|
Cb = pCb[3];
|
|
Cr = pCr[3];
|
|
JPEGPixelLE(pOutput+iPitch*2 + 2+iCol, Y1, Cb, Cr);
|
|
} // for each column
|
|
}
|
|
else
|
|
{
|
|
for (iCol=0; iCol<2; iCol++)
|
|
{
|
|
// top left block
|
|
Y1 = pY[iCol] << 12; // scale to level of conversion table
|
|
Cb = pCb[0];
|
|
Cr = pCr[0];
|
|
JPEGPixelBE(pOutput + iCol, Y1, Cb, Cr);
|
|
// top right block
|
|
Y1 = pY[iCol+(DCTSIZE*2)] << 12; // scale to level of conversion table
|
|
Cb = pCb[1];
|
|
Cr = pCr[1];
|
|
JPEGPixelBE(pOutput + 2+iCol, Y1, Cb, Cr);
|
|
// bottom left block
|
|
Y1 = pY[iCol+DCTSIZE*4] << 12; // scale to level of conversion table
|
|
Cb = pCb[2];
|
|
Cr = pCr[2];
|
|
JPEGPixelBE(pOutput+iPitch*2 + iCol, Y1, Cb, Cr);
|
|
// bottom right block
|
|
Y1 = pY[iCol+DCTSIZE*6] << 12; // scale to level of conversion table
|
|
Cb = pCb[3];
|
|
Cr = pCr[3];
|
|
JPEGPixelBE(pOutput+iPitch*2 + 2+iCol, Y1, Cb, Cr);
|
|
} // for each column
|
|
}
|
|
pY += 2; // skip 1 line of source pixels
|
|
pOutput += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
/* Convert YCC pixels into RGB pixels and store in output image */
|
|
iYCount = 4;
|
|
bUseOdd1 = bUseOdd2 = 1; // assume odd column can be used
|
|
if ((x+15) >= pJPEG->iWidth)
|
|
{
|
|
iCol = (((pJPEG->iWidth & 15)+1) >> 1);
|
|
if (iCol >= 4)
|
|
{
|
|
iXCount1 = 4;
|
|
iXCount2 = iCol-4;
|
|
if (pJPEG->iWidth & 1 && (iXCount2 * 2) + 8 + (x * 16) > pJPEG->iWidth)
|
|
bUseOdd2 = 0;
|
|
}
|
|
else
|
|
{
|
|
iXCount1 = iCol;
|
|
iXCount2 = 0;
|
|
if (pJPEG->iWidth & 1 && (iXCount1 * 2) + (x * 16) > pJPEG->iWidth)
|
|
bUseOdd1 = 0;
|
|
}
|
|
}
|
|
else
|
|
iXCount1 = iXCount2 = 4;
|
|
for (iRow=0; iRow<iYCount; iRow++) // up to 4 rows to do
|
|
{
|
|
for (iCol=0; iCol<iXCount1; iCol++) // up to 4 cols to do
|
|
{
|
|
// for top left block
|
|
Y1 = pY[iCol*2];
|
|
Y2 = pY[iCol*2+1];
|
|
Y3 = pY[iCol*2+8];
|
|
Y4 = pY[iCol*2+9];
|
|
Y1 <<= 12; // scale to level of conversion table
|
|
Y2 <<= 12;
|
|
Y3 <<= 12;
|
|
Y4 <<= 12;
|
|
Cb = pCb[iCol];
|
|
Cr = pCr[iCol];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
if (bUseOdd1 || iCol != (iXCount1-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2LE(pOutput + (iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2LE(pOutput+iPitch + (iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelLE(pOutput + (iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput+iPitch + (iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bUseOdd1 || iCol != (iXCount1-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2BE(pOutput + (iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2BE(pOutput+iPitch + (iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput + (iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput+iPitch + (iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
// for top right block
|
|
if (iCol < iXCount2)
|
|
{
|
|
Y1 = pY[iCol*2+DCTSIZE*2];
|
|
Y2 = pY[iCol*2+1+DCTSIZE*2];
|
|
Y3 = pY[iCol*2+8+DCTSIZE*2];
|
|
Y4 = pY[iCol*2+9+DCTSIZE*2];
|
|
Y1 <<= 12; // scale to level of conversion table
|
|
Y2 <<= 12;
|
|
Y3 <<= 12;
|
|
Y4 <<= 12;
|
|
Cb = pCb[iCol+4];
|
|
Cr = pCr[iCol+4];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
if (bUseOdd2 || iCol != (iXCount2-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2LE(pOutput + 8+(iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2LE(pOutput+iPitch + 8+(iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelLE(pOutput+ 8+(iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput+iPitch+ 8+(iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bUseOdd2 || iCol != (iXCount2-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2BE(pOutput + 8+(iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2BE(pOutput+iPitch + 8+(iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput+ 8+(iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput+iPitch+ 8+(iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
}
|
|
// for bottom left block
|
|
Y1 = pY[iCol*2+DCTSIZE*4];
|
|
Y2 = pY[iCol*2+1+DCTSIZE*4];
|
|
Y3 = pY[iCol*2+8+DCTSIZE*4];
|
|
Y4 = pY[iCol*2+9+DCTSIZE*4];
|
|
Y1 <<= 12; // scale to level of conversion table
|
|
Y2 <<= 12;
|
|
Y3 <<= 12;
|
|
Y4 <<= 12;
|
|
Cb = pCb[iCol+32];
|
|
Cr = pCr[iCol+32];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
if (bUseOdd1 || iCol != (iXCount1-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2LE(pOutput+iPitch*8+ (iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2LE(pOutput+iPitch*9+ (iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelLE(pOutput+iPitch*8+ (iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput+iPitch*9+ (iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bUseOdd1 || iCol != (iXCount1-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2BE(pOutput+iPitch*8+ (iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2BE(pOutput+iPitch*9+ (iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput+iPitch*8+ (iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput+iPitch*9+ (iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
// for bottom right block
|
|
if (iCol < iXCount2)
|
|
{
|
|
Y1 = pY[iCol*2+DCTSIZE*6];
|
|
Y2 = pY[iCol*2+1+DCTSIZE*6];
|
|
Y3 = pY[iCol*2+8+DCTSIZE*6];
|
|
Y4 = pY[iCol*2+9+DCTSIZE*6];
|
|
Y1 <<= 12; // scale to level of conversion table
|
|
Y2 <<= 12;
|
|
Y3 <<= 12;
|
|
Y4 <<= 12;
|
|
Cb = pCb[iCol+36];
|
|
Cr = pCr[iCol+36];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
if (bUseOdd2 || iCol != (iXCount2-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2LE(pOutput+iPitch*8+ 8+(iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2LE(pOutput+iPitch*9+ 8+(iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelLE(pOutput+iPitch*8+ 8+(iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput+iPitch*9+ 8+(iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bUseOdd2 || iCol != (iXCount2-1)) // only render if it won't go off the right edge
|
|
{
|
|
JPEGPixel2BE(pOutput+iPitch*8+ 8+(iCol<<1), Y1, Y2, Cb, Cr);
|
|
JPEGPixel2BE(pOutput+iPitch*9+ 8+(iCol<<1), Y3, Y4, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput+iPitch*8+ 8+(iCol<<1), Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput+iPitch*9+ 8+(iCol<<1), Y3, Cb, Cr);
|
|
}
|
|
}
|
|
}
|
|
} // for each column
|
|
pY += 16; // skip to next line of source pixels
|
|
pCb += 8;
|
|
pCr += 8;
|
|
pOutput += iPitch*2;
|
|
}
|
|
} /* JPEGPutMCU22() */
|
|
|
|
static void JPEGPutMCU12(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
uint32_t Cr,Cb;
|
|
signed int Y1, Y2;
|
|
int iRow, iCol, iXCount, iYCount;
|
|
uint8_t *pY, *pCr, *pCb;
|
|
uint16_t *pOutput = &pJPEG->usPixels[x];
|
|
uint8_t *pOutput8 = ((uint8_t*)pJPEG->usPixels) + x * 3;
|
|
|
|
pY = (uint8_t *)&pJPEG->sMCUs[0*DCTSIZE];
|
|
pCb = (uint8_t *)&pJPEG->sMCUs[2*DCTSIZE];
|
|
pCr = (uint8_t *)&pJPEG->sMCUs[3*DCTSIZE];
|
|
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (iRow=0; iRow<4; iRow++)
|
|
{
|
|
for (iCol=0; iCol<4; iCol++)
|
|
{
|
|
Y1 = (pY[0] + pY[1] + pY[8] + pY[9]) << 10;
|
|
Cb = (pCb[0] + pCb[1] + 1) >> 1;
|
|
Cr = (pCr[0] + pCr[1] + 1) >> 1;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput+iCol, Y1, Cb, Cr);
|
|
Y1 = (pY[DCTSIZE*2] + pY[DCTSIZE*2+1] + pY[DCTSIZE*2+8] + pY[DCTSIZE*2+9]) << 10;
|
|
Cb = (pCb[32] + pCb[33] + 1) >> 1;
|
|
Cr = (pCr[32] + pCr[33] + 1) >> 1;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol+iPitch, Y1, Cb, Cr);
|
|
else
|
|
JPEGPixelBE(pOutput+iCol+iPitch, Y1, Cb, Cr);
|
|
pCb += 2;
|
|
pCr += 2;
|
|
pY += 2;
|
|
}
|
|
pY += 8;
|
|
pOutput += iPitch*2;
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
Y1 = pY[0] << 12;
|
|
Y2 = pY[DCTSIZE*2] << 12;
|
|
Cb = pCb[0];
|
|
Cr = pCr[0];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + iPitch, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + iPitch, Y2, Cb, Cr);
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{ // draw a 2x4 block
|
|
Y1 = pY[0] << 12;
|
|
Y2 = pY[2] << 12;
|
|
Cb = pCb[0];
|
|
Cr = pCr[0];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + iPitch, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + iPitch, Y2, Cb, Cr);
|
|
}
|
|
Y1 = pY[1] << 12;
|
|
Y2 = pY[3] << 12;
|
|
Cb = pCb[1];
|
|
Cr = pCr[1];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput + 1, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + 1 + iPitch, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput + 1, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + 1 + iPitch, Y2, Cb, Cr);
|
|
}
|
|
pY += DCTSIZE*2; // next Y block below
|
|
Y1 = pY[0] << 12;
|
|
Y2 = pY[2] << 12;
|
|
Cb = pCb[2];
|
|
Cr = pCr[2];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput + iPitch*2, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + iPitch*3, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput + iPitch*2, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + iPitch*3, Y2, Cb, Cr);
|
|
}
|
|
Y1 = pY[1] << 12;
|
|
Y2 = pY[3] << 12;
|
|
Cb = pCb[3];
|
|
Cr = pCr[3];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput + 1 + iPitch*2, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + 1 + iPitch*3, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput + 1 + iPitch*2, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + 1 + iPitch*3, Y2, Cb, Cr);
|
|
}
|
|
return;
|
|
}
|
|
/* Convert YCC pixels into RGB pixels and store in output image */
|
|
iYCount = 16;
|
|
iXCount = 8;
|
|
for (iRow=0; iRow<iYCount; iRow+=2) // up to 16 rows to do
|
|
{
|
|
for (iCol=0; iCol<iXCount; iCol++) // up to 8 cols to do
|
|
{
|
|
Y1 = pY[iCol];
|
|
Y2 = pY[iCol+8];
|
|
Y1 <<= 12; // scale to level of conversion table
|
|
Y2 <<= 12;
|
|
Cb = pCb[iCol];
|
|
Cr = pCr[iCol];
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE(pOutput + iCol, Y1, Cb, Cr);
|
|
JPEGPixelLE(pOutput + iPitch + iCol, Y2, Cb, Cr);
|
|
}
|
|
else if (pJPEG->ucPixelType == RGB888_LITTLE_ENDIAN)
|
|
{
|
|
JPEGPixelLE888(pOutput8 + iCol*3, Y1, Cb, Cr);
|
|
JPEGPixelLE888(pOutput8 + (iPitch + iCol)*3, Y2, Cb, Cr);
|
|
}
|
|
else
|
|
{
|
|
JPEGPixelBE(pOutput + iCol, Y1, Cb, Cr);
|
|
JPEGPixelBE(pOutput + iPitch + iCol, Y2, Cb, Cr);
|
|
}
|
|
}
|
|
pY += 16; // skip to next 2 lines of source pixels
|
|
if (iRow == 6) // next MCU block, skip ahead to correct spot
|
|
pY += (128-64);
|
|
pCb += 8;
|
|
pCr += 8;
|
|
pOutput += iPitch*2; // next 2 lines of dest pixels
|
|
pOutput8 += iPitch*6;
|
|
}
|
|
} /* JPEGPutMCU12() */
|
|
static void JPEGPutMCU21(JPEGIMAGE *pJPEG, int x, int iPitch)
|
|
{
|
|
int iCr, iCb;
|
|
signed int Y1, Y2;
|
|
int iCol;
|
|
int iRow;
|
|
uint8_t *pY, *pCr, *pCb;
|
|
uint16_t *pOutput = &pJPEG->usPixels[x];
|
|
|
|
pY = (uint8_t *)&pJPEG->sMCUs[0*DCTSIZE];
|
|
pCb = (uint8_t *)&pJPEG->sMCUs[2*DCTSIZE];
|
|
pCr = (uint8_t *)&pJPEG->sMCUs[3*DCTSIZE];
|
|
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
{
|
|
for (iRow=0; iRow<4; iRow++)
|
|
{
|
|
for (iCol=0; iCol<4; iCol++)
|
|
{ // left block
|
|
iCr = (pCr[0] + pCr[8] + 1) >> 1;
|
|
iCb = (pCb[0] + pCb[8] + 1) >> 1;
|
|
Y1 = (signed int)(pY[0] + pY[1] + pY[8] + pY[9]) << 10;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol, Y1, iCb, iCr);
|
|
else
|
|
JPEGPixelBE(pOutput+iCol, Y1, iCb, iCr);
|
|
// right block
|
|
iCr = (pCr[4] + pCr[12] + 1) >> 1;
|
|
iCb = (pCb[4] + pCb[12] + 1) >> 1;
|
|
Y1 = (signed int)(pY[128] + pY[129] + pY[136] + pY[137]) << 10;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixelLE(pOutput+iCol+4, Y1, iCb, iCr);
|
|
else
|
|
JPEGPixelBE(pOutput+iCol+4, Y1, iCb, iCr);
|
|
pCb++;
|
|
pCr++;
|
|
pY += 2;
|
|
}
|
|
pCb += 12;
|
|
pCr += 12;
|
|
pY += 8;
|
|
pOutput += iPitch;
|
|
}
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{ // draw 2 pixels
|
|
iCr = pCr[0];
|
|
iCb = pCb[0];
|
|
Y1 = (signed int)(pY[0]) << 12;
|
|
Y2 = (signed int)(pY[DCTSIZE*2]) << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput, Y1, Y2, iCb, iCr);
|
|
return;
|
|
}
|
|
if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{ // draw 4x2 pixels
|
|
// top left
|
|
iCr = pCr[0];
|
|
iCb = pCb[0];
|
|
Y1 = (signed int)(pY[0]) << 12;
|
|
Y2 = (signed int)(pY[1]) << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput, Y1, Y2, iCb, iCr);
|
|
// top right
|
|
iCr = pCr[1];
|
|
iCb = pCb[1];
|
|
Y1 = (signed int)pY[DCTSIZE*2] << 12;
|
|
Y2 = (signed int)pY[DCTSIZE*2+1] << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput + 2, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput + 2, Y1, Y2, iCb, iCr);
|
|
// bottom left
|
|
iCr = pCr[2];
|
|
iCb = pCb[2];
|
|
Y1 = (signed int)(pY[2]) << 12;
|
|
Y2 = (signed int)(pY[3]) << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput + iPitch, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput + iPitch, Y1, Y2, iCb, iCr);
|
|
// bottom right
|
|
iCr = pCr[3];
|
|
iCb = pCb[3];
|
|
Y1 = (signed int)pY[DCTSIZE*2+2] << 12;
|
|
Y2 = (signed int)pY[DCTSIZE*2+3] << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput + iPitch + 2, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput + iPitch + 2, Y1, Y2, iCb, iCr);
|
|
return;
|
|
}
|
|
/* Convert YCC pixels into RGB pixels and store in output image */
|
|
for (iRow=0; iRow<8; iRow++) // up to 8 rows to do
|
|
{
|
|
for (iCol=0; iCol<4; iCol++) // up to 4x2 cols to do
|
|
{ // left block
|
|
iCr = *pCr++;
|
|
iCb = *pCb++;
|
|
Y1 = (signed int)(*pY++) << 12;
|
|
Y2 = (signed int)(*pY++) << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput + iCol*2, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput + iCol*2, Y1, Y2, iCb, iCr);
|
|
// right block
|
|
iCr = pCr[3];
|
|
iCb = pCb[3];
|
|
Y1 = (signed int)pY[126] << 12;
|
|
Y2 = (signed int)pY[127] << 12;
|
|
if (pJPEG->ucPixelType == RGB565_LITTLE_ENDIAN)
|
|
JPEGPixel2LE(pOutput + 8 + iCol*2, Y1, Y2, iCb, iCr);
|
|
else
|
|
JPEGPixel2BE(pOutput + 8 + iCol*2, Y1, Y2, iCb, iCr);
|
|
} // for col
|
|
pCb += 4;
|
|
pCr += 4;
|
|
pOutput += iPitch;
|
|
} // for row
|
|
} /* JPEGPutMCU21() */
|
|
|
|
// Dither the 8-bit gray pixels into 1, 2, or 4-bit gray
|
|
static void JPEGDither(JPEGIMAGE *pJPEG, int iWidth, int iHeight)
|
|
{
|
|
int x, y, xmask=0, iDestPitch=0;
|
|
int32_t cNew, lFErr, v=0, h;
|
|
int32_t e1,e2,e3,e4;
|
|
uint8_t cOut, ucPixelType; // forward errors for gray
|
|
uint8_t *pSrc, *pDest, *errors, *pErrors=NULL, *d, *pPixels; // destination 8bpp image
|
|
uint8_t pixelmask=0, shift=0;
|
|
|
|
ucPixelType = pJPEG->ucPixelType;
|
|
errors = (uint8_t *)pJPEG->usPixels; // plenty of space here
|
|
errors[0] = errors[1] = errors[2] = 0;
|
|
pDest = pSrc = pJPEG->pDitherBuffer; // write the new pixels over the original
|
|
switch (ucPixelType)
|
|
{
|
|
case FOUR_BIT_DITHERED:
|
|
iDestPitch = (iWidth+1)/2;
|
|
pixelmask = 0xf0;
|
|
shift = 4;
|
|
xmask = 1;
|
|
break;
|
|
case TWO_BIT_DITHERED:
|
|
iDestPitch = (iWidth+3)/4;
|
|
pixelmask = 0xc0;
|
|
shift = 2;
|
|
xmask = 3;
|
|
break;
|
|
case ONE_BIT_DITHERED:
|
|
iDestPitch = (iWidth+7)/8;
|
|
pixelmask = 0x80;
|
|
shift = 1;
|
|
xmask = 7;
|
|
break;
|
|
}
|
|
for (y=0; y<iHeight; y++)
|
|
{
|
|
pPixels = &pSrc[y * iWidth];
|
|
d = &pDest[y * iDestPitch];
|
|
pErrors = &errors[1]; // point to second pixel to avoid boundary check
|
|
lFErr = 0;
|
|
cOut = 0;
|
|
for (x=0; x<iWidth; x++)
|
|
{
|
|
cNew = *pPixels++; // get grayscale uint8_t pixel
|
|
// add forward error
|
|
cNew += lFErr;
|
|
if (cNew > 255) cNew = 255; // clip to uint8_t
|
|
cOut <<= shift; // pack new pixels into a byte
|
|
cOut |= (cNew >> (8-shift)); // keep top N bits
|
|
if ((x & xmask) == xmask) // store it when the byte is full
|
|
{
|
|
*d++ = cOut;
|
|
cOut = 0;
|
|
}
|
|
// calculate the Floyd-Steinberg error for this pixel
|
|
v = cNew - (cNew & pixelmask); // new error for N-bit gray output (always positive)
|
|
h = v >> 1;
|
|
e1 = (7*h)>>3; // 7/16
|
|
e2 = h - e1; // 1/16
|
|
e3 = (5*h) >> 3; // 5/16
|
|
e4 = h - e3; // 3/16
|
|
// distribute error to neighbors
|
|
lFErr = e1 + pErrors[1];
|
|
pErrors[1] = (uint8_t)e2;
|
|
pErrors[0] += e3;
|
|
pErrors[-1] += e4;
|
|
pErrors++;
|
|
} // for x
|
|
} // for y
|
|
} /* JPEGDither() */
|
|
|
|
//
|
|
// Decode the image
|
|
// returns 0 for error, 1 for success
|
|
//
|
|
static int DecodeJPEG(JPEGIMAGE *pJPEG)
|
|
{
|
|
int cx, cy, x, y, mcuCX, mcuCY;
|
|
int iLum0, iLum1, iLum2, iLum3, iCr, iCb;
|
|
signed int iDCPred0, iDCPred1, iDCPred2;
|
|
int i, iQuant1, iQuant2, iQuant3, iErr;
|
|
uint8_t c;
|
|
int iMCUCount, xoff, iPitch, bThumbnail = 0;
|
|
int bContinue = 1; // early exit if the DRAW callback wants to stop
|
|
uint32_t l, *pl;
|
|
unsigned char cDCTable0, cACTable0, cDCTable1, cACTable1, cDCTable2, cACTable2;
|
|
JPEGDRAW jd;
|
|
int iMaxFill = 16, iScaleShift = 0;
|
|
|
|
// Requested the Exif thumbnail
|
|
if (pJPEG->iOptions & JPEG_EXIF_THUMBNAIL)
|
|
{
|
|
if (pJPEG->iThumbData == 0 || pJPEG->iThumbWidth == 0) // doesn't exist
|
|
{
|
|
pJPEG->iError = JPEG_INVALID_PARAMETER;
|
|
return 0;
|
|
}
|
|
if (!JPEGParseInfo(pJPEG, 1)) // parse the embedded thumbnail file header
|
|
return 0; // something went wrong
|
|
}
|
|
// Fast downscaling options
|
|
if (pJPEG->iOptions & JPEG_SCALE_HALF)
|
|
iScaleShift = 1;
|
|
else if (pJPEG->iOptions & JPEG_SCALE_QUARTER)
|
|
{
|
|
iScaleShift = 2;
|
|
iMaxFill = 1;
|
|
}
|
|
else if (pJPEG->iOptions & JPEG_SCALE_EIGHTH)
|
|
{
|
|
iScaleShift = 3;
|
|
iMaxFill = 1;
|
|
bThumbnail = 1;
|
|
}
|
|
|
|
// reorder and fix the quantization table for decoding
|
|
JPEGFixQuantD(pJPEG);
|
|
pJPEG->bb.ulBits = MOTOLONG(&pJPEG->ucFileBuf[0]); // preload first 4 bytes
|
|
pJPEG->bb.pBuf = pJPEG->ucFileBuf;
|
|
pJPEG->bb.ulBitOff = 0;
|
|
|
|
cDCTable0 = pJPEG->JPCI[0].dc_tbl_no;
|
|
cACTable0 = pJPEG->JPCI[0].ac_tbl_no;
|
|
cDCTable1 = pJPEG->JPCI[1].dc_tbl_no;
|
|
cACTable1 = pJPEG->JPCI[1].ac_tbl_no;
|
|
cDCTable2 = pJPEG->JPCI[2].dc_tbl_no;
|
|
cACTable2 = pJPEG->JPCI[2].ac_tbl_no;
|
|
iDCPred0 = iDCPred1 = iDCPred2 = mcuCX = mcuCY = 0;
|
|
|
|
printf("SubSample mode: 0x%x\n", pJPEG->ucSubSample);
|
|
|
|
switch (pJPEG->ucSubSample) // set up the parameters for the different subsampling options
|
|
{
|
|
case 0x00: // fake value to handle grayscale
|
|
case 0x01: // fake value to handle sRGB/CMYK
|
|
case 0x11:
|
|
cx = (pJPEG->iWidth + 7) >> 3; // number of MCU blocks
|
|
cy = (pJPEG->iHeight + 7) >> 3;
|
|
iCr = MCU1;
|
|
iCb = MCU2;
|
|
mcuCX = mcuCY = 8;
|
|
break;
|
|
case 0x12:
|
|
cx = (pJPEG->iWidth + 7) >> 3; // number of MCU blocks
|
|
cy = (pJPEG->iHeight + 15) >> 4;
|
|
iCr = MCU2;
|
|
iCb = MCU3;
|
|
mcuCX = 8;
|
|
mcuCY = 16;
|
|
break;
|
|
case 0x21:
|
|
cx = (pJPEG->iWidth + 15) >> 4; // number of MCU blocks
|
|
cy = (pJPEG->iHeight + 7) >> 3;
|
|
iCr = MCU2;
|
|
iCb = MCU3;
|
|
mcuCX = 16;
|
|
mcuCY = 8;
|
|
break;
|
|
case 0x22:
|
|
cx = (pJPEG->iWidth + 15) >> 4; // number of MCU blocks
|
|
cy = (pJPEG->iHeight + 15) >> 4;
|
|
iCr = MCU4;
|
|
iCb = MCU5;
|
|
mcuCX = mcuCY = 16;
|
|
break;
|
|
default: // to suppress compiler warning
|
|
cx = cy = 0;
|
|
iCr = iCb = 0;
|
|
break;
|
|
}
|
|
// Scale down the MCUs by the requested amount
|
|
mcuCX >>= iScaleShift;
|
|
mcuCY >>= iScaleShift;
|
|
|
|
iQuant1 = pJPEG->sQuantTable[pJPEG->JPCI[0].quant_tbl_no*DCTSIZE]; // DC quant values
|
|
iQuant2 = pJPEG->sQuantTable[pJPEG->JPCI[1].quant_tbl_no*DCTSIZE];
|
|
iQuant3 = pJPEG->sQuantTable[pJPEG->JPCI[2].quant_tbl_no*DCTSIZE];
|
|
// luminance values are always in these positions
|
|
iLum0 = MCU0;
|
|
iLum1 = MCU1;
|
|
iLum2 = MCU2;
|
|
iLum3 = MCU3;
|
|
iErr = 0;
|
|
pJPEG->iResCount = pJPEG->iResInterval;
|
|
// Calculate how many MCUs we can fit in the pixel buffer to maximize LCD drawing speed
|
|
iMCUCount = MAX_BUFFERED_PIXELS / (mcuCX * mcuCY);
|
|
if (pJPEG->ucPixelType == EIGHT_BIT_GRAYSCALE)
|
|
iMCUCount *= 2; // each pixel is only 1 byte
|
|
else if (pJPEG->ucPixelType == RGB888_LITTLE_ENDIAN)
|
|
iMCUCount = (iMCUCount >> 1) + (iMCUCount >> 3); // each picel is 3 bytes
|
|
if (iMCUCount > cx)
|
|
iMCUCount = cx; // don't go wider than the image
|
|
if (iMCUCount > pJPEG->iMaxMCUs) // did the user set an upper bound on how many pixels per JPEGDraw callback?
|
|
iMCUCount = pJPEG->iMaxMCUs;
|
|
if (pJPEG->ucPixelType > EIGHT_BIT_GRAYSCALE) // dithered, override the max MCU count
|
|
iMCUCount = cx; // do the whole row
|
|
jd.iBpp = 16;
|
|
switch (pJPEG->ucPixelType)
|
|
{
|
|
case RGB888_LITTLE_ENDIAN:
|
|
jd.iBpp = 24;
|
|
break;
|
|
case EIGHT_BIT_GRAYSCALE:
|
|
jd.iBpp = 8;
|
|
break;
|
|
case FOUR_BIT_DITHERED:
|
|
jd.iBpp = 4;
|
|
break;
|
|
case TWO_BIT_DITHERED:
|
|
jd.iBpp = 2;
|
|
break;
|
|
case ONE_BIT_DITHERED:
|
|
jd.iBpp = 1;
|
|
break;
|
|
}
|
|
if (pJPEG->ucPixelType > EIGHT_BIT_GRAYSCALE)
|
|
jd.pPixels = (uint16_t *)pJPEG->pDitherBuffer;
|
|
else
|
|
jd.pPixels = pJPEG->usPixels;
|
|
jd.iHeight = mcuCY;
|
|
jd.y = pJPEG->iYOffset;
|
|
for (y = 0; y < cy && bContinue && iErr == 0; y++, jd.y += mcuCY)
|
|
{
|
|
jd.x = pJPEG->iXOffset;
|
|
xoff = 0; // start of new LCD output group
|
|
iPitch = iMCUCount * mcuCX; // pixels per line of LCD buffer
|
|
for (x = 0; x < cx && bContinue && iErr == 0; x++)
|
|
{
|
|
pJPEG->ucACTable = cACTable0;
|
|
pJPEG->ucDCTable = cDCTable0;
|
|
// do the first luminance component
|
|
iErr = JPEGDecodeMCU(pJPEG, iLum0, &iDCPred0);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iLum0];
|
|
c = ucRangeTable[((iDCPred0 * iQuant1) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iLum0, pJPEG->JPCI[0].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8))); // first quantization table
|
|
}
|
|
// do the second luminance component
|
|
if (pJPEG->ucSubSample > 0x11) // subsampling
|
|
{
|
|
iErr |= JPEGDecodeMCU(pJPEG, iLum1, &iDCPred0);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
c = ucRangeTable[((iDCPred0 * iQuant1) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iLum1];
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iLum1, pJPEG->JPCI[0].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8))); // first quantization table
|
|
}
|
|
if (pJPEG->ucSubSample == 0x22)
|
|
{
|
|
iErr |= JPEGDecodeMCU(pJPEG, iLum2, &iDCPred0);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
c = ucRangeTable[((iDCPred0 * iQuant1) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iLum2];
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iLum2, pJPEG->JPCI[0].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8))); // first quantization table
|
|
}
|
|
iErr |= JPEGDecodeMCU(pJPEG, iLum3, &iDCPred0);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
c = ucRangeTable[((iDCPred0 * iQuant1) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iLum3];
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iLum3, pJPEG->JPCI[0].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8))); // first quantization table
|
|
}
|
|
} // if 2:2 subsampling
|
|
} // if subsampling used
|
|
if (pJPEG->ucSubSample && pJPEG->ucNumComponents == 3) // if color (not CMYK)
|
|
{
|
|
// first chroma
|
|
pJPEG->ucACTable = cACTable1;
|
|
pJPEG->ucDCTable = cDCTable1;
|
|
iErr |= JPEGDecodeMCU(pJPEG, iCr, &iDCPred1);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
c = ucRangeTable[((iDCPred1 * iQuant2) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iCr];
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iCr, pJPEG->JPCI[1].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8))); // second quantization table
|
|
}
|
|
// second chroma
|
|
pJPEG->ucACTable = cACTable2;
|
|
pJPEG->ucDCTable = cDCTable2;
|
|
iErr |= JPEGDecodeMCU(pJPEG, iCb, &iDCPred2);
|
|
if (pJPEG->ucMaxACCol == 0 || bThumbnail) // no AC components, save some time
|
|
{
|
|
c = ucRangeTable[((iDCPred2 * iQuant3) >> 5) & 0x3ff];
|
|
l = c | ((uint32_t) c << 8) | ((uint32_t) c << 16) | ((uint32_t) c << 24);
|
|
// dct stores byte values
|
|
pl = (uint32_t *)&pJPEG->sMCUs[iCb];
|
|
for (i = 0; i<iMaxFill; i++) // 8x8 bytes = 16 longs
|
|
pl[i] = l;
|
|
}
|
|
else
|
|
{
|
|
JPEGIDCT(pJPEG, iCb, pJPEG->JPCI[2].quant_tbl_no, (pJPEG->ucMaxACCol | (pJPEG->ucMaxACRow << 8)));
|
|
}
|
|
} // if color components present
|
|
if (pJPEG->ucPixelType >= EIGHT_BIT_GRAYSCALE)
|
|
{
|
|
JPEGPutMCU8BitGray(pJPEG, xoff, iPitch);
|
|
}
|
|
else
|
|
{
|
|
switch (pJPEG->ucSubSample)
|
|
{
|
|
case 0x00: // grayscale
|
|
JPEGPutMCUGray(pJPEG, xoff, iPitch);
|
|
break;
|
|
case 0x11:
|
|
JPEGPutMCU11(pJPEG, xoff, iPitch);
|
|
break;
|
|
case 0x12:
|
|
JPEGPutMCU12(pJPEG, xoff, iPitch);
|
|
break;
|
|
case 0x21:
|
|
JPEGPutMCU21(pJPEG, xoff, iPitch);
|
|
break;
|
|
case 0x22:
|
|
JPEGPutMCU22(pJPEG, xoff, iPitch);
|
|
break;
|
|
} // switch on color option
|
|
}
|
|
xoff += mcuCX;
|
|
if (xoff == iPitch || x == cx-1) // time to draw
|
|
{
|
|
xoff = 0;
|
|
jd.iWidth = jd.iWidthUsed = iPitch; // width of each LCD block group
|
|
jd.pUser = pJPEG->pUser;
|
|
if (pJPEG->ucPixelType > EIGHT_BIT_GRAYSCALE) // dither to 4/2/1 bits
|
|
JPEGDither(pJPEG, cx * mcuCX, mcuCY);
|
|
if ((x+1)*mcuCX > pJPEG->iWidth) { // right edge has clipped pixels
|
|
jd.iWidthUsed = iPitch - (cx*mcuCX - pJPEG->iWidth);
|
|
}
|
|
if ((jd.y - pJPEG->iYOffset + mcuCY) > (pJPEG->iHeight>>iScaleShift)) { // last row needs to be trimmed
|
|
jd.iHeight = (pJPEG->iHeight>>iScaleShift) - (jd.y - pJPEG->iYOffset);
|
|
}
|
|
bContinue = (*pJPEG->pfnDraw)(&jd);
|
|
jd.x += iPitch;
|
|
if ((cx - 1 - x) < iMCUCount) // change pitch for the last set of MCUs on this row
|
|
iPitch = (cx - 1 - x) * mcuCX;
|
|
}
|
|
if (pJPEG->iResInterval)
|
|
{
|
|
if (--pJPEG->iResCount == 0)
|
|
{
|
|
pJPEG->iResCount = pJPEG->iResInterval;
|
|
iDCPred0 = iDCPred1 = iDCPred2 = 0; // reset DC predictors
|
|
if (pJPEG->bb.ulBitOff & 7) // need to start at the next even byte
|
|
{
|
|
pJPEG->bb.ulBitOff += (8 - (pJPEG->bb.ulBitOff & 7)); // new restart interval starts on byte boundary
|
|
}
|
|
} // if restart interval needs to reset
|
|
} // if there is a restart interval
|
|
// See if we need to feed it more data
|
|
if (pJPEG->iVLCOff >= FILE_HIGHWATER)
|
|
JPEGGetMoreData(pJPEG); // need more 'filtered' VLC data
|
|
} // for x
|
|
} // for y
|
|
if (iErr != 0)
|
|
pJPEG->iError = JPEG_DECODE_ERROR;
|
|
return (iErr == 0);
|
|
} /* DecodeJPEG() */
|