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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGrTexturePixelRef.h"
#include "GrContext.h"
#include "GrTexture.h"
#include "SkGr.h"
#include "SkRect.h"
// since we call lockPixels recursively on fBitmap, we need a distinct mutex,
// to avoid deadlock with the default one provided by SkPixelRef.
static SkMutex gROLockPixelsPixelRefMutex;
SkROLockPixelsPixelRef::SkROLockPixelsPixelRef() : INHERITED(&gROLockPixelsPixelRefMutex) {
}
SkROLockPixelsPixelRef::~SkROLockPixelsPixelRef() {
}
void* SkROLockPixelsPixelRef::onLockPixels(SkColorTable** ctable) {
if (ctable) {
*ctable = NULL;
}
fBitmap.reset();
// SkDebugf("---------- calling readpixels in support of lockpixels\n");
if (!this->onReadPixels(&fBitmap, NULL)) {
SkDebugf("SkROLockPixelsPixelRef::onLockPixels failed!\n");
return NULL;
}
fBitmap.lockPixels();
return fBitmap.getPixels();
}
void SkROLockPixelsPixelRef::onUnlockPixels() {
fBitmap.unlockPixels();
}
bool SkROLockPixelsPixelRef::onLockPixelsAreWritable() const {
return false;
}
///////////////////////////////////////////////////////////////////////////////
static SkGrTexturePixelRef* copyToTexturePixelRef(GrTexture* texture,
SkBitmap::Config dstConfig) {
if (NULL == texture) {
return NULL;
}
GrContext* context = texture->getContext();
if (NULL == context) {
return NULL;
}
GrTextureDesc desc;
desc.fWidth = texture->width();
desc.fHeight = texture->height();
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fConfig = SkGr::BitmapConfig2PixelConfig(dstConfig, false);
desc.fAALevel = kNone_GrAALevel;
GrTexture* dst = context->createUncachedTexture(desc, NULL, 0);
if (NULL == dst) {
return NULL;
}
context->copyTexture(texture, dst->asRenderTarget());
SkGrTexturePixelRef* pixelRef = new SkGrTexturePixelRef(dst);
GrSafeUnref(dst);
return pixelRef;
}
///////////////////////////////////////////////////////////////////////////////
SkGrTexturePixelRef::SkGrTexturePixelRef(GrTexture* tex) {
fTexture = tex;
GrSafeRef(tex);
}
SkGrTexturePixelRef::~SkGrTexturePixelRef() {
GrSafeUnref(fTexture);
}
SkGpuTexture* SkGrTexturePixelRef::getTexture() {
return (SkGpuTexture*)fTexture;
}
SkPixelRef* SkGrTexturePixelRef::deepCopy(SkBitmap::Config dstConfig) {
return copyToTexturePixelRef(fTexture, dstConfig);
}
bool SkGrTexturePixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
if (NULL != fTexture && fTexture->isValid()) {
int left, top, width, height;
if (NULL != subset) {
left = subset->fLeft;
width = subset->width();
top = subset->fTop;
height = subset->height();
} else {
left = 0;
width = fTexture->width();
top = 0;
height = fTexture->height();
}
dst->setConfig(SkBitmap::kARGB_8888_Config, width, height);
dst->allocPixels();
SkAutoLockPixels al(*dst);
void* buffer = dst->getPixels();
return fTexture->readPixels(left, top, width, height,
kSkia8888_PM_GrPixelConfig,
buffer, dst->rowBytes());
} else {
return false;
}
}
///////////////////////////////////////////////////////////////////////////////
SkGrRenderTargetPixelRef::SkGrRenderTargetPixelRef(GrRenderTarget* rt) {
fRenderTarget = rt;
GrSafeRef(fRenderTarget);
}
SkGrRenderTargetPixelRef::~SkGrRenderTargetPixelRef() {
GrSafeUnref(fRenderTarget);
}
SkGpuTexture* SkGrRenderTargetPixelRef::getTexture() {
if (NULL != fRenderTarget) {
return (SkGpuTexture*) fRenderTarget->asTexture();
}
return NULL;
}
SkPixelRef* SkGrRenderTargetPixelRef::deepCopy(SkBitmap::Config dstConfig) {
if (NULL == fRenderTarget) {
return NULL;
}
// Note that when copying an SkGrRenderTargetPixelRef, we actually
// return an SkGrTexturePixelRef instead. This is because
// SkGrRenderTargetPixelRef is usually created in conjunction with
// GrTexture owned elsewhere (e.g., SkGpuDevice), and cannot live
// independently of that texture. SkGrTexturePixelRef, on the other
// hand, owns its own GrTexture, and is thus self-contained.
return copyToTexturePixelRef(fRenderTarget->asTexture(), dstConfig);
}
bool SkGrRenderTargetPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
if (NULL != fRenderTarget && fRenderTarget->isValid()) {
int left, top, width, height;
if (NULL != subset) {
left = subset->fLeft;
width = subset->width();
top = subset->fTop;
height = subset->height();
} else {
left = 0;
width = fRenderTarget->width();
top = 0;
height = fRenderTarget->height();
}
dst->setConfig(SkBitmap::kARGB_8888_Config, width, height);
dst->allocPixels();
SkAutoLockPixels al(*dst);
void* buffer = dst->getPixels();
return fRenderTarget->readPixels(left, top, width, height,
kSkia8888_PM_GrPixelConfig,
buffer, dst->rowBytes());
} else {
return false;
}
}
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