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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageDecoder.h"
#include "SkBitmap.h"
#include "SkImagePriv.h"
#include "SkPixelRef.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkCanvas.h"
SkImageDecoder::SkImageDecoder()
: fPeeker(nullptr)
, fAllocator(nullptr)
, fSampleSize(1)
, fDefaultPref(kUnknown_SkColorType)
, fPreserveSrcDepth(false)
, fDitherImage(true)
, fSkipWritingZeroes(false)
, fPreferQualityOverSpeed(false)
, fRequireUnpremultipliedColors(false) {
}
SkImageDecoder::~SkImageDecoder() {
SkSafeUnref(fPeeker);
SkSafeUnref(fAllocator);
}
void SkImageDecoder::copyFieldsToOther(SkImageDecoder* other) {
if (nullptr == other) {
return;
}
other->setPeeker(fPeeker);
other->setAllocator(fAllocator);
other->setSampleSize(fSampleSize);
other->setPreserveSrcDepth(fPreserveSrcDepth);
other->setDitherImage(fDitherImage);
other->setSkipWritingZeroes(fSkipWritingZeroes);
other->setPreferQualityOverSpeed(fPreferQualityOverSpeed);
other->setRequireUnpremultipliedColors(fRequireUnpremultipliedColors);
}
SkImageDecoder::Format SkImageDecoder::getFormat() const {
return kUnknown_Format;
}
const char* SkImageDecoder::getFormatName() const {
return GetFormatName(this->getFormat());
}
const char* SkImageDecoder::GetFormatName(Format format) {
switch (format) {
case kUnknown_Format:
return "Unknown Format";
case kBMP_Format:
return "BMP";
case kGIF_Format:
return "GIF";
case kICO_Format:
return "ICO";
case kPKM_Format:
return "PKM";
case kKTX_Format:
return "KTX";
case kASTC_Format:
return "ASTC";
case kJPEG_Format:
return "JPEG";
case kPNG_Format:
return "PNG";
case kWBMP_Format:
return "WBMP";
case kWEBP_Format:
return "WEBP";
default:
SkDEBUGFAIL("Invalid format type!");
}
return "Unknown Format";
}
SkPngChunkReader* SkImageDecoder::setPeeker(SkPngChunkReader* peeker) {
SkRefCnt_SafeAssign(fPeeker, peeker);
return peeker;
}
SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) {
SkRefCnt_SafeAssign(fAllocator, alloc);
return alloc;
}
void SkImageDecoder::setSampleSize(int size) {
if (size < 1) {
size = 1;
}
fSampleSize = size;
}
bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap,
SkColorTable* ctable) const {
return bitmap->tryAllocPixels(fAllocator, ctable);
}
///////////////////////////////////////////////////////////////////////////////
SkColorType SkImageDecoder::getPrefColorType(SrcDepth srcDepth, bool srcHasAlpha) const {
SkColorType ct = fDefaultPref;
if (fPreserveSrcDepth) {
switch (srcDepth) {
case kIndex_SrcDepth:
ct = kIndex_8_SkColorType;
break;
case k8BitGray_SrcDepth:
ct = kN32_SkColorType;
break;
case k32Bit_SrcDepth:
ct = kN32_SkColorType;
break;
}
}
return ct;
}
SkImageDecoder::Result SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, SkColorType pref,
Mode mode) {
// we reset this to false before calling onDecode
fShouldCancelDecode = false;
// assign this, for use by getPrefColorType(), in case fUsePrefTable is false
fDefaultPref = pref;
// pass a temporary bitmap, so that if we return false, we are assured of
// leaving the caller's bitmap untouched.
SkBitmap tmp;
const Result result = this->onDecode(stream, &tmp, mode);
if (kFailure != result) {
bm->swap(tmp);
}
return result;
}
///////////////////////////////////////////////////////////////////////////////
bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, SkColorType pref, Mode mode,
Format* format) {
SkASSERT(file);
SkASSERT(bm);
SkAutoTDelete<SkStreamRewindable> stream(SkStream::NewFromFile(file));
if (stream.get()) {
if (SkImageDecoder::DecodeStream(stream, bm, pref, mode, format)) {
if (SkPixelRef* pr = bm->pixelRef()) {
pr->setURI(file);
}
return true;
}
}
return false;
}
bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, SkColorType pref,
Mode mode, Format* format) {
if (0 == size) {
return false;
}
SkASSERT(buffer);
SkMemoryStream stream(buffer, size);
return SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format);
}
bool SkImageDecoder::DecodeStream(SkStreamRewindable* stream, SkBitmap* bm, SkColorType pref,
Mode mode, Format* format) {
SkASSERT(stream);
SkASSERT(bm);
bool success = false;
SkImageDecoder* codec = SkImageDecoder::Factory(stream);
if (codec) {
success = codec->decode(stream, bm, pref, mode) != kFailure;
if (success && format) {
*format = codec->getFormat();
if (kUnknown_Format == *format) {
if (stream->rewind()) {
*format = GetStreamFormat(stream);
}
}
}
delete codec;
}
return success;
}
bool SkImageDecoder::decodeYUV8Planes(SkStream* stream, SkISize componentSizes[3], void* planes[3],
size_t rowBytes[3], SkYUVColorSpace* colorSpace) {
// we reset this to false before calling onDecodeYUV8Planes
fShouldCancelDecode = false;
return this->onDecodeYUV8Planes(stream, componentSizes, planes, rowBytes, colorSpace);
}
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