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/*
* 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 "GrContext.h"
#include "GrDrawContext.h"
#include "GrYUVProvider.h"
#include "effects/GrYUVtoRGBEffect.h"
#include "SkCachedData.h"
#include "SkRefCnt.h"
#include "SkResourceCache.h"
#include "SkYUVPlanesCache.h"
namespace {
/**
* Helper class to manage the resources used for storing the YUV planar data. Depending on the
* useCache option, we may find (and lock) the data in our ResourceCache, or we may have allocated
* it in scratch storage.
*/
class YUVScoper {
public:
bool init(GrYUVProvider*, SkYUVPlanesCache::Info*, void* planes[3], bool useCache);
private:
// we only use one or the other of these
SkAutoTUnref<SkCachedData> fCachedData;
SkAutoMalloc fStorage;
};
}
bool YUVScoper::init(GrYUVProvider* provider, SkYUVPlanesCache::Info* yuvInfo, void* planes[3],
bool useCache) {
if (useCache) {
fCachedData.reset(SkYUVPlanesCache::FindAndRef(provider->onGetID(), yuvInfo));
}
if (fCachedData.get()) {
planes[0] = (void*)fCachedData->data();
planes[1] = (uint8_t*)planes[0] + yuvInfo->fSizeInMemory[0];
planes[2] = (uint8_t*)planes[1] + yuvInfo->fSizeInMemory[1];
} else {
// Fetch yuv plane sizes for memory allocation. Here, width and height can be
// rounded up to JPEG block size and be larger than the image's width and height.
if (!provider->onGetYUVSizes(yuvInfo->fSize)) {
return false;
}
// Allocate the memory for YUV
size_t totalSize(0);
for (int i = 0; i < GrYUVProvider::kPlaneCount; ++i) {
yuvInfo->fRowBytes[i] = yuvInfo->fSize[i].fWidth; // we assume snug fit: rb == width
yuvInfo->fSizeInMemory[i] = yuvInfo->fRowBytes[i] * yuvInfo->fSize[i].fHeight;
totalSize += yuvInfo->fSizeInMemory[i];
}
if (useCache) {
fCachedData.reset(SkResourceCache::NewCachedData(totalSize));
planes[0] = fCachedData->writable_data();
} else {
fStorage.reset(totalSize);
planes[0] = fStorage.get();
}
planes[1] = (uint8_t*)planes[0] + yuvInfo->fSizeInMemory[0];
planes[2] = (uint8_t*)planes[1] + yuvInfo->fSizeInMemory[1];
// Get the YUV planes and update plane sizes to actual image size
if (!provider->onGetYUVPlanes(yuvInfo->fSize, planes, yuvInfo->fRowBytes,
&yuvInfo->fColorSpace)) {
return false;
}
if (useCache) {
// Decoding is done, cache the resulting YUV planes
SkYUVPlanesCache::Add(provider->onGetID(), fCachedData, yuvInfo);
}
}
return true;
}
GrTexture* GrYUVProvider::refAsTexture(GrContext* ctx, const GrSurfaceDesc& desc, bool useCache) {
SkYUVPlanesCache::Info yuvInfo;
void* planes[3];
YUVScoper scoper;
if (!scoper.init(this, &yuvInfo, planes, useCache)) {
return nullptr;
}
GrSurfaceDesc yuvDesc;
yuvDesc.fConfig = kAlpha_8_GrPixelConfig;
SkAutoTUnref<GrTexture> yuvTextures[3];
for (int i = 0; i < 3; ++i) {
yuvDesc.fWidth = yuvInfo.fSize[i].fWidth;
yuvDesc.fHeight = yuvInfo.fSize[i].fHeight;
// TODO: why do we need this check?
bool needsExactTexture = (yuvDesc.fWidth != yuvInfo.fSize[0].fWidth) ||
(yuvDesc.fHeight != yuvInfo.fSize[0].fHeight);
if (needsExactTexture) {
yuvTextures[i].reset(ctx->textureProvider()->createTexture(yuvDesc, true));
} else {
yuvTextures[i].reset(ctx->textureProvider()->createApproxTexture(yuvDesc));
}
if (!yuvTextures[i] ||
!yuvTextures[i]->writePixels(0, 0, yuvDesc.fWidth, yuvDesc.fHeight,
yuvDesc.fConfig, planes[i], yuvInfo.fRowBytes[i])) {
return nullptr;
}
}
GrSurfaceDesc rtDesc = desc;
rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
SkAutoTUnref<GrTexture> result(ctx->textureProvider()->createTexture(rtDesc, true, nullptr, 0));
if (!result) {
return nullptr;
}
GrRenderTarget* renderTarget = result->asRenderTarget();
SkASSERT(renderTarget);
GrPaint paint;
SkAutoTUnref<GrFragmentProcessor> yuvToRgbProcessor(
GrYUVtoRGBEffect::Create(yuvTextures[0],
yuvTextures[1],
yuvTextures[2],
yuvInfo.fSize,
yuvInfo.fColorSpace));
paint.addColorFragmentProcessor(yuvToRgbProcessor);
const SkRect r = SkRect::MakeIWH(yuvInfo.fSize[0].fWidth, yuvInfo.fSize[0].fHeight);
SkAutoTUnref<GrDrawContext> drawContext(ctx->drawContext(renderTarget));
if (!drawContext) {
return nullptr;
}
drawContext->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), r);
return result.detach();
}
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