blob: 95fd61316342f5f46dd875f724e3df755b34b6ca [file] [log] [blame]
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCodec.h"
#include "SkColorTable.h"
#include "SkPngChunkReader.h"
#include "SkEncodedFormat.h"
#include "SkImageInfo.h"
#include "SkRefCnt.h"
#include "SkSwizzler.h"
#include "png.h"
class SkStream;
class SkPngCodec : public SkCodec {
public:
static bool IsPng(const char*, size_t);
// Assume IsPng was called and returned true.
static SkCodec* NewFromStream(SkStream*, SkPngChunkReader* = NULL);
virtual ~SkPngCodec();
protected:
Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
override;
SkEncodedFormat onGetEncodedFormat() const override { return kPNG_SkEncodedFormat; }
bool onRewind() override;
uint32_t onGetFillValue(SkColorType) const override;
// Helper to set up swizzler and color table. Also calls png_read_update_info.
Result initializeSwizzler(const SkImageInfo& requestedInfo, const Options&,
SkPMColor*, int* ctableCount);
SkSampler* getSampler(bool createIfNecessary) override {
SkASSERT(fSwizzler);
return fSwizzler;
}
SkPngCodec(const SkImageInfo&, SkStream*, SkPngChunkReader*, png_structp, png_infop, int, int);
png_structp png_ptr() { return fPng_ptr; }
SkSwizzler* swizzler() { return fSwizzler; }
SkSwizzler::SrcConfig srcConfig() const { return fSrcConfig; }
int numberPasses() const { return fNumberPasses; }
private:
SkAutoTUnref<SkPngChunkReader> fPngChunkReader;
png_structp fPng_ptr;
png_infop fInfo_ptr;
// These are stored here so they can be used both by normal decoding and scanline decoding.
SkAutoTUnref<SkColorTable> fColorTable; // May be unpremul.
SkAutoTDelete<SkSwizzler> fSwizzler;
SkSwizzler::SrcConfig fSrcConfig;
const int fNumberPasses;
int fBitDepth;
bool decodePalette(bool premultiply, int* ctableCount);
void destroyReadStruct();
typedef SkCodec INHERITED;
};