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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 "SkBitmapCache.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* copy_to_new_texture_pixelref(GrTexture* texture, SkColorType dstCT,
SkColorProfileType dstPT, const SkIRect* subset) {
if (NULL == texture || kUnknown_SkColorType == dstCT) {
return NULL;
}
GrContext* context = texture->getContext();
if (NULL == context) {
return NULL;
}
GrSurfaceDesc desc;
SkIRect srcRect;
if (!subset) {
desc.fWidth = texture->width();
desc.fHeight = texture->height();
srcRect = SkIRect::MakeWH(texture->width(), texture->height());
} else {
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();
srcRect = *subset;
}
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fConfig = SkImageInfo2GrPixelConfig(dstCT, kPremul_SkAlphaType, dstPT);
GrTexture* dst = context->createTexture(desc, false, NULL, 0);
if (NULL == dst) {
return NULL;
}
// Blink is relying on the above copy being sent to GL immediately in the case when the source
// is a WebGL canvas backing store. We could have a TODO to remove this flush flag, but we have
// a larger TODO to remove SkGrPixelRef entirely.
context->copySurface(dst->asRenderTarget(), texture, srcRect, SkIPoint::Make(0,0),
GrContext::kFlushWrites_PixelOp);
SkImageInfo info = SkImageInfo::Make(desc.fWidth, desc.fHeight, dstCT, kPremul_SkAlphaType,
dstPT);
SkGrPixelRef* pixelRef = SkNEW_ARGS(SkGrPixelRef, (info, dst));
SkSafeUnref(dst);
return pixelRef;
}
///////////////////////////////////////////////////////////////////////////////
SkGrPixelRef::SkGrPixelRef(const SkImageInfo& info, GrSurface* surface) : INHERITED(info) {
// For surfaces that are both textures and render targets, the texture owns the
// render target but not vice versa. So we ref the texture to keep both alive for
// the lifetime of this pixel ref.
fSurface = SkSafeRef(surface->asTexture());
if (NULL == fSurface) {
fSurface = SkSafeRef(surface);
}
if (fSurface) {
SkASSERT(info.width() <= fSurface->width());
SkASSERT(info.height() <= fSurface->height());
}
}
SkGrPixelRef::~SkGrPixelRef() {
SkSafeUnref(fSurface);
}
GrTexture* SkGrPixelRef::getTexture() {
if (fSurface) {
return fSurface->asTexture();
}
return NULL;
}
SkPixelRef* SkGrPixelRef::deepCopy(SkColorType dstCT, SkColorProfileType dstPT,
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 copy_to_new_texture_pixelref(fSurface->asTexture(), dstCT, dstPT, subset);
}
static bool tryAllocBitmapPixels(SkBitmap* bitmap) {
SkBitmap::Allocator* allocator = SkBitmapCache::GetAllocator();
if (NULL != allocator) {
return allocator->allocPixelRef(bitmap, 0);
} else {
// DiscardableMemory is not available, fallback to default allocator
return bitmap->tryAllocPixels();
}
}
bool SkGrPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
if (NULL == fSurface || fSurface->wasDestroyed()) {
return false;
}
SkIRect bounds;
if (subset) {
bounds = *subset;
} else {
bounds = SkIRect::MakeWH(this->info().width(), this->info().height());
}
//Check the cache
if(!SkBitmapCache::Find(this->getGenerationID(), bounds, dst)) {
//Cache miss
SkBitmap cachedBitmap;
cachedBitmap.setInfo(this->info().makeWH(bounds.width(), bounds.height()));
// If we can't alloc the pixels, then fail
if (!tryAllocBitmapPixels(&cachedBitmap)) {
return false;
}
// Try to read the pixels from the surface
void* buffer = cachedBitmap.getPixels();
bool readPixelsOk = fSurface->readPixels(bounds.fLeft, bounds.fTop,
bounds.width(), bounds.height(),
kSkia8888_GrPixelConfig,
buffer, cachedBitmap.rowBytes());
if (!readPixelsOk) {
return false;
}
// If we are here, pixels were read correctly from the surface.
cachedBitmap.setImmutable();
//Add to the cache
SkBitmapCache::Add(this->getGenerationID(), bounds, cachedBitmap);
dst->swap(cachedBitmap);
}
return true;
}
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