sdrangel/sdrbase/util/png.h

97 wiersze
3.4 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Jon Beniston, M7RCE <jon@beniston.com> //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef INCLUDE_PNG_H
#define INCLUDE_PNG_H
#include <QByteArray>
#include <QImage>
#include "export.h"
#include "util/crc.h"
// PNG (Portable Network Graphics) utility code
// Contains just enough functionality to support assembling APNG files (Animated PNGs)
// from multiple PNGs (which can be created using Qt)
class SDRBASE_API PNG {
public:
PNG();
PNG(QByteArray data);
void appendSignature();
void appendEnd();
void appendChunk(const char *type, QByteArray chunk);
void append(QByteArray data);
void appendInt(QByteArray& ba, quint32 value);
void appendShort(QByteArray& ba, quint16 value);
void appendInt(quint32 value);
qint32 getInt(int index);
qint32 crc(const char *type, const QByteArray data);
qint32 typeStringToInt(const char *header);
QString intToTypeString(quint32 type);
void appendacTL(int frames, quint32 loops=0);
void appendfcTL(quint32 seqNo, quint32 width, quint32 height, int fps, quint32 xOffset=0, quint32 yOffset=0);
void appendfdAT(quint32 seqNo, const QByteArray& data);
QByteArray data();
bool checkSignature();
int findChunk(const char *type, int startIndex=0);
QByteArray getChunk(const char *type);
QByteArray getChunks(const char *type);
QList<QByteArray> getChunkData(const char *type);
quint32 getWidth() const;
quint32 getHeight() const;
private:
QByteArray m_signature = QByteArrayLiteral("\x89\x50\x4e\x47\x0d\x0a\x1a\x0a");
QByteArray m_bytes;
crc32 m_crc;
quint32 m_width;
quint32 m_height;
};
// Animated PNG
class SDRBASE_API APNG {
public:
APNG(int frames) :
m_frames(frames),
m_frame(0),
m_seqNo(0),
m_ended(false)
{
m_png.appendSignature();
}
bool addImage(const QImage& image, int fps=5);
bool save(const QString& fileName);
private:
PNG m_png;
int m_frames; //!< Total number of frames in animation
int m_frame; //!< Current frame number
int m_seqNo; //!< Chunk sequence number
bool m_ended; //!< IEND chunk has added
};
#endif // INCLUDE_PNG_H