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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImage.h"
#include "SkImageGenerator.h"
#include "SkNextID.h"
SkImageGenerator::SkImageGenerator(const SkImageInfo& info, uint32_t uniqueID)
: fInfo(info)
, fUniqueID(kNeedNewImageUniqueID == uniqueID ? SkNextID::ImageID() : uniqueID)
{}
bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount) {
if (kUnknown_SkColorType == info.colorType()) {
return false;
}
if (nullptr == pixels) {
return false;
}
if (rowBytes < info.minRowBytes()) {
return false;
}
if (kIndex_8_SkColorType == info.colorType()) {
if (nullptr == ctable || nullptr == ctableCount) {
return false;
}
} else {
if (ctableCount) {
*ctableCount = 0;
}
ctableCount = nullptr;
ctable = nullptr;
}
const bool success = this->onGetPixels(info, pixels, rowBytes, ctable, ctableCount);
if (success && ctableCount) {
SkASSERT(*ctableCount >= 0 && *ctableCount <= 256);
}
return success;
}
bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
SkASSERT(kIndex_8_SkColorType != info.colorType());
if (kIndex_8_SkColorType == info.colorType()) {
return false;
}
return this->getPixels(info, pixels, rowBytes, nullptr, nullptr);
}
bool SkImageGenerator::queryYUV8(SkYUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const {
SkASSERT(sizeInfo);
return this->onQueryYUV8(sizeInfo, colorSpace);
}
bool SkImageGenerator::getYUV8Planes(const SkYUVSizeInfo& sizeInfo, void* planes[3]) {
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kY].fWidth >= 0);
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kY].fHeight >= 0);
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kU].fWidth >= 0);
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kU].fHeight >= 0);
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kV].fWidth >= 0);
SkASSERT(sizeInfo.fSizes[SkYUVSizeInfo::kV].fHeight >= 0);
SkASSERT(sizeInfo.fWidthBytes[SkYUVSizeInfo::kY] >=
(size_t) sizeInfo.fSizes[SkYUVSizeInfo::kY].fWidth);
SkASSERT(sizeInfo.fWidthBytes[SkYUVSizeInfo::kU] >=
(size_t) sizeInfo.fSizes[SkYUVSizeInfo::kU].fWidth);
SkASSERT(sizeInfo.fWidthBytes[SkYUVSizeInfo::kV] >=
(size_t) sizeInfo.fSizes[SkYUVSizeInfo::kV].fWidth);
SkASSERT(planes && planes[0] && planes[1] && planes[2]);
return this->onGetYUV8Planes(sizeInfo, planes);
}
#if SK_SUPPORT_GPU
#include "GrTextureProxy.h"
sk_sp<GrTextureProxy> SkImageGenerator::generateTexture(GrContext* ctx, const SkImageInfo& info,
const SkIPoint& origin) {
SkIRect srcRect = SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height());
if (!SkIRect::MakeWH(fInfo.width(), fInfo.height()).contains(srcRect)) {
return nullptr;
}
return this->onGenerateTexture(ctx, info, origin);
}
sk_sp<GrTextureProxy> SkImageGenerator::onGenerateTexture(GrContext*, const SkImageInfo&,
const SkIPoint&) {
return nullptr;
}
#endif
/////////////////////////////////////////////////////////////////////////////////////////////
SkData* SkImageGenerator::onRefEncodedData(GrContext* ctx) {
return nullptr;
}
bool SkImageGenerator::onGetPixels(const SkImageInfo& info, void* dst, size_t rb,
SkPMColor* colors, int* colorCount) {
return false;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkBitmap.h"
#include "SkColorTable.h"
static bool reset_and_return_false(SkBitmap* bitmap) {
bitmap->reset();
return false;
}
bool SkImageGenerator::tryGenerateBitmap(SkBitmap* bitmap, const SkImageInfo& info,
SkBitmap::Allocator* allocator) {
if (0 == info.getSafeSize(info.minRowBytes())) {
return false;
}
if (!bitmap->setInfo(info)) {
return reset_and_return_false(bitmap);
}
SkPMColor ctStorage[256];
memset(ctStorage, 0xFF, sizeof(ctStorage)); // init with opaque-white for the moment
sk_sp<SkColorTable> ctable(new SkColorTable(ctStorage, 256));
if (!bitmap->tryAllocPixels(allocator, ctable.get())) {
// SkResourceCache's custom allcator can'thandle ctables, so it may fail on
// kIndex_8_SkColorTable.
// https://bug.skia.org/4355
#if 1
// ignore the allocator, and see if we can succeed without it
if (!bitmap->tryAllocPixels(nullptr, ctable.get())) {
return reset_and_return_false(bitmap);
}
#else
// this is the up-scale technique, not fully debugged, but we keep it here at the moment
// to remind ourselves that this might be better than ignoring the allocator.
info = SkImageInfo::MakeN32(info.width(), info.height(), info.alphaType());
if (!bitmap->setInfo(info)) {
return reset_and_return_false(bitmap);
}
// we pass nullptr for the ctable arg, since we are now explicitly N32
if (!bitmap->tryAllocPixels(allocator, nullptr)) {
return reset_and_return_false(bitmap);
}
#endif
}
bitmap->lockPixels();
if (!bitmap->getPixels()) {
return reset_and_return_false(bitmap);
}
int ctCount = 0;
if (!this->getPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(),
ctStorage, &ctCount)) {
return reset_and_return_false(bitmap);
}
if (ctCount > 0) {
SkASSERT(kIndex_8_SkColorType == bitmap->colorType());
// we and bitmap should be owners
SkASSERT(!ctable->unique());
// Now we need to overwrite the ctable we built earlier, with the correct colors.
// This does mean that we may have made the table too big, but that cannot be avoided
// until we can change SkImageGenerator's API to return us the ctable *before* we have to
// allocate space for all the pixels.
ctable->dangerous_overwriteColors(ctStorage, ctCount);
} else {
SkASSERT(kIndex_8_SkColorType != bitmap->colorType());
// we should be the only owner
SkASSERT(ctable->unique());
}
return true;
}
#include "SkGraphics.h"
static SkGraphics::ImageGeneratorFromEncodedDataFactory gFactory;
SkGraphics::ImageGeneratorFromEncodedDataFactory
SkGraphics::SetImageGeneratorFromEncodedDataFactory(ImageGeneratorFromEncodedDataFactory factory)
{
ImageGeneratorFromEncodedDataFactory prev = gFactory;
gFactory = factory;
return prev;
}
std::unique_ptr<SkImageGenerator> SkImageGenerator::MakeFromEncoded(sk_sp<SkData> data) {
if (!data) {
return nullptr;
}
if (gFactory) {
if (std::unique_ptr<SkImageGenerator> generator = gFactory(data)) {
return generator;
}
}
return SkImageGenerator::MakeFromEncodedImpl(std::move(data));
}
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