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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 "SkGrPixelRef.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.
SK_DECLARE_STATIC_MUTEX(gROLockPixelsPixelRefMutex);
SkROLockPixelsPixelRef::SkROLockPixelsPixelRef(const SkImageInfo& info)
: INHERITED(info, &gROLockPixelsPixelRefMutex) {}
SkROLockPixelsPixelRef::~SkROLockPixelsPixelRef() {}
bool SkROLockPixelsPixelRef::onNewLockPixels(LockRec* rec) {
fBitmap.reset();
// SkDebugf("---------- calling readpixels in support of lockpixels\n");
if (!this->onReadPixels(&fBitmap, NULL)) {
SkDebugf("SkROLockPixelsPixelRef::onLockPixels failed!\n");
return false;
}
fBitmap.lockPixels();
if (NULL == fBitmap.getPixels()) {
return false;
}
rec->fPixels = fBitmap.getPixels();
rec->fColorTable = NULL;
rec->fRowBytes = fBitmap.rowBytes();
return true;
}
void SkROLockPixelsPixelRef::onUnlockPixels() {
fBitmap.unlockPixels();
}
bool SkROLockPixelsPixelRef::onLockPixelsAreWritable() const {
return false;
}
///////////////////////////////////////////////////////////////////////////////
static SkGrPixelRef* copyToTexturePixelRef(GrTexture* texture, SkBitmap::Config dstConfig,
const SkIRect* subset) {
if (NULL == texture) {
return NULL;
}
GrContext* context = texture->getContext();
if (NULL == context) {
return NULL;
}
GrTextureDesc desc;
SkIPoint pointStorage;
SkIPoint* topLeft;
if (subset != NULL) {
SkASSERT(SkIRect::MakeWH(texture->width(), texture->height()).contains(*subset));
// Create a new texture that is the size of subset.
desc.fWidth = subset->width();
desc.fHeight = subset->height();
pointStorage.set(subset->x(), subset->y());
topLeft = &pointStorage;
} else {
desc.fWidth = texture->width();
desc.fHeight = texture->height();
topLeft = NULL;
}
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fConfig = SkBitmapConfig2GrPixelConfig(dstConfig);
SkImageInfo info;
if (!GrPixelConfig2ColorType(desc.fConfig, &info.fColorType)) {
return NULL;
}
info.fWidth = desc.fWidth;
info.fHeight = desc.fHeight;
info.fAlphaType = kPremul_SkAlphaType;
GrTexture* dst = context->createUncachedTexture(desc, NULL, 0);
if (NULL == dst) {
return NULL;
}
context->copyTexture(texture, dst->asRenderTarget(), topLeft);
// TODO: figure out if this is responsible for Chrome canvas errors
#if 0
// The render texture we have created (to perform the copy) isn't fully
// functional (since it doesn't have a stencil buffer). Release it here
// so the caller doesn't try to render to it.
// TODO: we can undo this release when dynamic stencil buffer attach/
// detach has been implemented
dst->releaseRenderTarget();
#endif
SkGrPixelRef* pixelRef = SkNEW_ARGS(SkGrPixelRef, (info, dst));
SkSafeUnref(dst);
return pixelRef;
}
///////////////////////////////////////////////////////////////////////////////
SkGrPixelRef::SkGrPixelRef(const SkImageInfo& info, GrSurface* surface,
bool transferCacheLock) : INHERITED(info) {
// TODO: figure out if this is responsible for Chrome canvas errors
#if 0
// The GrTexture has a ref to the GrRenderTarget but not vice versa.
// If the GrTexture exists take a ref to that (rather than the render
// target)
fSurface = surface->asTexture();
#else
fSurface = NULL;
#endif
if (NULL == fSurface) {
fSurface = surface;
}
fUnlock = transferCacheLock;
SkSafeRef(surface);
if (fSurface) {
SkASSERT(info.fWidth <= fSurface->width());
SkASSERT(info.fHeight <= fSurface->height());
}
}
SkGrPixelRef::~SkGrPixelRef() {
if (fUnlock) {
GrContext* context = fSurface->getContext();
GrTexture* texture = fSurface->asTexture();
if (NULL != context && NULL != texture) {
context->unlockScratchTexture(texture);
}
}
SkSafeUnref(fSurface);
}
GrTexture* SkGrPixelRef::getTexture() {
if (NULL != fSurface) {
return fSurface->asTexture();
}
return NULL;
}
SkPixelRef* SkGrPixelRef::deepCopy(SkBitmap::Config dstConfig, const SkIRect* subset) {
if (NULL == fSurface) {
return NULL;
}
// Note that when copying a render-target-backed pixel ref, we
// return a texture-backed pixel ref instead. This is because
// render-target pixel refs are usually created in conjunction with
// a GrTexture owned elsewhere (e.g., SkGpuDevice), and cannot live
// independently of that texture. Texture-backed pixel refs, on the other
// hand, own their GrTextures, and are thus self-contained.
return copyToTexturePixelRef(fSurface->asTexture(), dstConfig, subset);
}
bool SkGrPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
if (NULL == fSurface || !fSurface->isValid()) {
return false;
}
int left, top, width, height;
if (NULL != subset) {
left = subset->fLeft;
width = subset->width();
top = subset->fTop;
height = subset->height();
} else {
left = 0;
width = this->info().fWidth;
top = 0;
height = this->info().fHeight;
}
if (!dst->allocPixels(SkImageInfo::MakeN32Premul(width, height))) {
SkDebugf("SkGrPixelRef::onReadPixels failed to alloc bitmap for result!\n");
return false;
}
SkAutoLockPixels al(*dst);
void* buffer = dst->getPixels();
return fSurface->readPixels(left, top, width, height,
kSkia8888_GrPixelConfig,
buffer, dst->rowBytes());
}
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