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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 "SkImageGenerator.h"
#include "SkNextID.h"
SkImageGenerator::SkImageGenerator(const SkImageInfo& info)
: fInfo(info)
, fUniqueID(SkNextID::ImageID())
{}
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::getYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
SkYUVColorSpace* colorSpace) {
#ifdef SK_DEBUG
// In all cases, we need the sizes array
SkASSERT(sizes);
bool isValidWithPlanes = (planes) && (rowBytes) &&
((planes[0]) && (planes[1]) && (planes[2]) &&
(0 != rowBytes[0]) && (0 != rowBytes[1]) && (0 != rowBytes[2]));
bool isValidWithoutPlanes =
((nullptr == planes) ||
((nullptr == planes[0]) && (nullptr == planes[1]) && (nullptr == planes[2]))) &&
((nullptr == rowBytes) ||
((0 == rowBytes[0]) && (0 == rowBytes[1]) && (0 == rowBytes[2])));
// Either we have all planes and rowBytes information or we have none of it
// Having only partial information is not supported
SkASSERT(isValidWithPlanes || isValidWithoutPlanes);
// If we do have planes information, make sure all sizes are non 0
// and all rowBytes are valid
SkASSERT(!isValidWithPlanes ||
((sizes[0].fWidth >= 0) &&
(sizes[0].fHeight >= 0) &&
(sizes[1].fWidth >= 0) &&
(sizes[1].fHeight >= 0) &&
(sizes[2].fWidth >= 0) &&
(sizes[2].fHeight >= 0) &&
(rowBytes[0] >= (size_t)sizes[0].fWidth) &&
(rowBytes[1] >= (size_t)sizes[1].fWidth) &&
(rowBytes[2] >= (size_t)sizes[2].fWidth)));
#endif
return this->onGetYUV8Planes(sizes, planes, rowBytes, colorSpace);
}
bool SkImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]) {
return false;
}
bool SkImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
SkYUVColorSpace* colorSpace) {
// In order to maintain compatibility with clients that implemented the original
// onGetYUV8Planes interface, we assume that the color space is JPEG.
// TODO(rileya): remove this and the old onGetYUV8Planes once clients switch over to
// the new interface.
if (colorSpace) {
*colorSpace = kJPEG_SkYUVColorSpace;
}
return this->onGetYUV8Planes(sizes, planes, rowBytes);
}
GrTexture* SkImageGenerator::generateTexture(GrContext* ctx, const SkIRect* subset) {
if (subset && !SkIRect::MakeWH(fInfo.width(), fInfo.height()).contains(*subset)) {
return nullptr;
}
return this->onGenerateTexture(ctx, subset);
}
bool SkImageGenerator::computeScaledDimensions(SkScalar scale, SupportedSizes* sizes) {
if (scale > 0 && scale <= 1) {
return this->onComputeScaledDimensions(scale, sizes);
}
return false;
}
bool SkImageGenerator::generateScaledPixels(const SkISize& scaledSize,
const SkIPoint& subsetOrigin,
const SkPixmap& subsetPixels) {
if (scaledSize.width() <= 0 || scaledSize.height() <= 0) {
return false;
}
if (subsetPixels.width() <= 0 || subsetPixels.height() <= 0) {
return false;
}
const SkIRect subset = SkIRect::MakeXYWH(subsetOrigin.x(), subsetOrigin.y(),
subsetPixels.width(), subsetPixels.height());
if (!SkIRect::MakeWH(scaledSize.width(), scaledSize.height()).contains(subset)) {
return false;
}
return this->onGenerateScaledPixels(scaledSize, subsetOrigin, subsetPixels);
}
/////////////////////////////////////////////////////////////////////////////////////////////
SkData* SkImageGenerator::onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) {
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* infoPtr,
SkBitmap::Allocator* allocator) {
SkImageInfo info = infoPtr ? *infoPtr : this->getInfo();
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
SkAutoTUnref<SkColorTable> ctable(new SkColorTable(ctStorage, 256));
if (!bitmap->tryAllocPixels(allocator, ctable)) {
// SkResourceCache's custom allcator can'thandle ctables, so it may fail on
// kIndex_8_SkColorTable.
// https://bug.skia.org/4355
#if 1
// ignroe the allocator, and see if we can succeed without it
if (!bitmap->tryAllocPixels(nullptr, ctable)) {
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::ImageGeneratorFromEncodedFactory gFactory;
SkGraphics::ImageGeneratorFromEncodedFactory
SkGraphics::SetImageGeneratorFromEncodedFactory(ImageGeneratorFromEncodedFactory factory)
{
ImageGeneratorFromEncodedFactory prev = gFactory;
gFactory = factory;
return prev;
}
SkImageGenerator* SkImageGenerator::NewFromEncoded(SkData* data) {
if (nullptr == data) {
return nullptr;
}
if (gFactory) {
if (SkImageGenerator* generator = gFactory(data)) {
return generator;
}
}
return SkImageGenerator::NewFromEncodedImpl(data);
}
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