kopia lustrzana https://github.com/raspberrypi/pico-playground
63 wiersze
2.1 KiB
C
63 wiersze
2.1 KiB
C
/*
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef _RENDER_SPANS_H
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#define _RENDER_SPANS_H
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#include "image.h"
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// ----------------------------------------------------------------------------
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// 4bit1 encoding (vogon) - data is paletted and as such may contain alpha
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//
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// note changing this affects decoder since it is subtracted from length
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#define MIN_COLOR_SPAN_4BIT 5
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#define MIN_RAW_SPAN_4BIT 4
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enum vogon_commands {
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END_OF_LINE = 0,
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RAW_PIXELS_SHORT = 0x40,
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COLOR_PIXELS_SHORT = 0x80,
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SINGLE_PIXEL = 0xc0,
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RAW_PIXELS_LONG = 0xd0,
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COLOR_PIXELS_LONG = 0xd1
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};
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enum {
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SPAN_SOLID,
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SPAN_4BIT_VOGON_OPAQUE, // vogon data but using a solid color palette
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SPAN_4BIT_RAW,
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SPAN_8BIT_RAW
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};
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struct span {
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struct span *next;
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short_flags flags;
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uint16_t width; // count of displayed pixels
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uint8_t type;
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union {
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struct {
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uint16_t color16;
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} solid;
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struct {
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uint16_t clip_left; // > 0 to clip pixels off the left
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uint16_t content_width; // pixel width of the original content
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struct palette16 *palette;
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const uint8_t *data;
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uint16_t data_length;
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} vogon, raw_4bit, raw_8bit;
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};
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};
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extern int32_t render_spans(uint32_t *render_spans_buffer, size_t max_words, struct span *head, int width);
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extern int32_t single_color_scanline(uint32_t *buf, size_t buf_length, int width, uint32_t color16);
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extern void init_solid_color_span(struct span *span, uint16_t width, uint16_t color16, struct span *prev);
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extern void init_vogon_4bit_span(struct span *span, uint16_t width, const uint8_t *encoding, uint16_t encoded_size,
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struct palette16 *palette, struct span *prev);
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extern void set_solid_color_span_color(struct span *span, uint16_t color16);
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extern void set_vogon_4bit_span_encoding(struct span *span, const uint8_t *data, uint16_t data_length);
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extern void set_vogon_4bit_clipping(struct span *span, int clip_left, int display_width);
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#endif //CONVERT_SPANS_H
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