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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDecodingImageGenerator.h"
#include "SkData.h"
#include "SkImageDecoder.h"
#include "SkImageGenerator.h"
#include "SkImagePriv.h"
#include "SkStream.h"
namespace {
/**
* Special allocator used by getPixels(). Uses preallocated memory
* provided.
*/
class TargetAllocator : public SkBitmap::Allocator {
public:
TargetAllocator(void* target, size_t rowBytes, const SkImageInfo& info)
: fTarget(target)
, fRowBytes(rowBytes)
, fInfo(info) { }
virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) SK_OVERRIDE {
if ((SkImageInfoToBitmapConfig(fInfo) != bm->config())
|| (bm->width() != fInfo.fWidth)
|| (bm->height() != fInfo.fHeight)) {
return false;
}
bm->setConfig(bm->config(), bm->width(), bm->height(),
fRowBytes, bm->alphaType());
bm->setPixels(fTarget, ct);
return true;
}
private:
void* fTarget;
size_t fRowBytes;
SkImageInfo fInfo;
typedef SkBitmap::Allocator INHERITED;
};
} // namespace
////////////////////////////////////////////////////////////////////////////////
SkDecodingImageGenerator::SkDecodingImageGenerator(SkData* data)
: fData(data)
, fHasInfo(false)
, fDoCopyTo(false) {
SkASSERT(fData != NULL);
fStream = SkNEW_ARGS(SkMemoryStream, (fData));
SkASSERT(fStream != NULL);
SkASSERT(fStream->unique());
fData->ref();
}
SkDecodingImageGenerator::SkDecodingImageGenerator(SkStreamRewindable* stream)
: fData(NULL)
, fStream(stream)
, fHasInfo(false)
, fDoCopyTo(false) {
SkASSERT(fStream != NULL);
SkASSERT(fStream->unique());
}
SkDecodingImageGenerator::~SkDecodingImageGenerator() {
SkSafeUnref(fData);
fStream->unref();
}
// TODO(halcanary): Give this macro a better name and move it into SkTypes.h
#ifdef SK_DEBUG
#define SkCheckResult(expr, value) SkASSERT((value) == (expr))
#else
#define SkCheckResult(expr, value) (void)(expr)
#endif
SkData* SkDecodingImageGenerator::refEncodedData() {
// This functionality is used in `gm --serialize`
if (fData != NULL) {
return SkSafeRef(fData);
}
// TODO(halcanary): SkStreamRewindable needs a refData() function
// which returns a cheap copy of the underlying data.
if (!fStream->rewind()) {
return NULL;
}
size_t length = fStream->getLength();
if (0 == length) {
return NULL;
}
void* buffer = sk_malloc_flags(length, 0);
SkCheckResult(fStream->read(buffer, length), length);
fData = SkData::NewFromMalloc(buffer, length);
return SkSafeRef(fData);
}
bool SkDecodingImageGenerator::getInfo(SkImageInfo* info) {
// info can be NULL. If so, will update fInfo, fDoCopyTo, and fHasInfo.
if (fHasInfo) {
if (info != NULL) {
*info = fInfo;
}
return true;
}
SkAssertResult(fStream->rewind());
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream));
if (NULL == decoder.get()) {
return false;
}
SkBitmap bitmap;
if (!decoder->decode(fStream, &bitmap,
SkImageDecoder::kDecodeBounds_Mode)) {
return false;
}
if (bitmap.config() == SkBitmap::kNo_Config) {
return false;
}
if (!bitmap.asImageInfo(&fInfo)) {
// We can't use bitmap.config() as is.
if (!bitmap.canCopyTo(SkBitmap::kARGB_8888_Config)) {
SkDEBUGFAIL("!bitmap->canCopyTo(SkBitmap::kARGB_8888_Config)");
return false;
}
fDoCopyTo = true;
fInfo.fWidth = bitmap.width();
fInfo.fHeight = bitmap.height();
fInfo.fColorType = kPMColor_SkColorType;
fInfo.fAlphaType = bitmap.alphaType();
}
if (info != NULL) {
*info = fInfo;
}
fHasInfo = true;
return true;
}
bool SkDecodingImageGenerator::getPixels(const SkImageInfo& info,
void* pixels,
size_t rowBytes) {
if (NULL == pixels) {
return false;
}
if (!this->getInfo(NULL)) {
return false;
}
if (SkImageInfoToBitmapConfig(info) == SkBitmap::kNo_Config) {
return false; // Unsupported SkColorType.
}
SkAssertResult(fStream->rewind());
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream));
if (NULL == decoder.get()) {
return false;
}
if (fInfo != info) {
// The caller has specified a different info. For now, this
// is an error. In the future, we will check to see if we can
// convert.
return false;
}
int bpp = SkBitmap::ComputeBytesPerPixel(SkImageInfoToBitmapConfig(info));
if (static_cast<size_t>(bpp * info.fWidth) > rowBytes) {
return false;
}
SkBitmap bitmap;
if (!bitmap.setConfig(info, rowBytes)) {
return false;
}
TargetAllocator allocator(pixels, rowBytes, info);
if (!fDoCopyTo) {
decoder->setAllocator(&allocator);
}
bool success = decoder->decode(fStream, &bitmap,
SkImageDecoder::kDecodePixels_Mode);
decoder->setAllocator(NULL);
if (!success) {
return false;
}
if (fDoCopyTo) {
SkBitmap bm8888;
bitmap.copyTo(&bm8888, SkBitmap::kARGB_8888_Config, &allocator);
}
return true;
}
bool SkDecodingImageGenerator::Install(SkData* data, SkBitmap* dst,
SkDiscardableMemory::Factory* factory) {
SkASSERT(data != NULL);
SkASSERT(dst != NULL);
SkImageGenerator* gen(SkNEW_ARGS(SkDecodingImageGenerator, (data)));
return SkInstallDiscardablePixelRef(gen, dst, factory);
}
bool SkDecodingImageGenerator::Install(SkStreamRewindable* stream,
SkBitmap* dst,
SkDiscardableMemory::Factory* factory) {
SkASSERT(stream != NULL);
SkASSERT(dst != NULL);
if ((stream == NULL) || !stream->unique()) {
SkSafeUnref(stream);
return false;
}
SkImageGenerator* gen(SkNEW_ARGS(SkDecodingImageGenerator, (stream)));
return SkInstallDiscardablePixelRef(gen, dst, factory);
}
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