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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSurface_Base.h"
#include "SkImagePriv.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkMallocPixelRef.h"
class SkSurface_Raster : public SkSurface_Base {
public:
SkSurface_Raster(const SkImageInfo&, void*, size_t rb,
void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps*);
SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef>, const SkSurfaceProps*);
SkCanvas* onNewCanvas() override;
sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override;
sk_sp<SkImage> onNewImageSnapshot() override;
void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override;
void onCopyOnWrite(ContentChangeMode) override;
void onRestoreBackingMutability() override;
private:
SkBitmap fBitmap;
size_t fRowBytes;
bool fWeOwnThePixels;
typedef SkSurface_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
bool SkSurfaceValidateRasterInfo(const SkImageInfo& info, size_t rowBytes) {
if (info.isEmpty()) {
return false;
}
static const size_t kMaxTotalSize = SK_MaxS32;
int shift = 0;
switch (info.colorType()) {
case kAlpha_8_SkColorType:
if (info.colorSpace()) {
return false;
}
shift = 0;
break;
case kRGB_565_SkColorType:
if (info.colorSpace()) {
return false;
}
shift = 1;
break;
case kN32_SkColorType:
if (info.colorSpace() && !info.colorSpace()->gammaCloseToSRGB()) {
return false;
}
shift = 2;
break;
case kRGBA_F16_SkColorType:
if (info.colorSpace() && (!info.colorSpace()->gammaIsLinear())) {
return false;
}
shift = 3;
break;
default:
return false;
}
if (kIgnoreRowBytesValue == rowBytes) {
return true;
}
uint64_t minRB = (uint64_t)info.width() << shift;
if (minRB > rowBytes) {
return false;
}
size_t alignedRowBytes = rowBytes >> shift << shift;
if (alignedRowBytes != rowBytes) {
return false;
}
uint64_t size = sk_64_mul(info.height(), rowBytes);
if (size > kMaxTotalSize) {
return false;
}
return true;
}
SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, void* pixels, size_t rb,
void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps* props)
: INHERITED(info, props)
{
fBitmap.installPixels(info, pixels, rb, releaseProc, context);
fRowBytes = 0; // don't need to track the rowbytes
fWeOwnThePixels = false; // We are "Direct"
}
SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef> pr,
const SkSurfaceProps* props)
: INHERITED(pr->width(), pr->height(), props)
{
fBitmap.setInfo(info, pr->rowBytes());
fRowBytes = pr->rowBytes(); // we track this, so that subsequent re-allocs will match
fBitmap.setPixelRef(std::move(pr), 0, 0);
fWeOwnThePixels = true;
}
SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); }
sk_sp<SkSurface> SkSurface_Raster::onNewSurface(const SkImageInfo& info) {
return SkSurface::MakeRaster(info, &this->props());
}
void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
canvas->drawBitmap(fBitmap, x, y, paint);
}
sk_sp<SkImage> SkSurface_Raster::onNewImageSnapshot() {
SkCopyPixelsMode cpm = kIfMutable_SkCopyPixelsMode;
if (fWeOwnThePixels) {
// SkImage_raster requires these pixels are immutable for its full lifetime.
// We'll undo this via onRestoreBackingMutability() if we can avoid the COW.
if (SkPixelRef* pr = fBitmap.pixelRef()) {
pr->setTemporarilyImmutable();
}
} else {
cpm = kAlways_SkCopyPixelsMode;
}
// Our pixels are in memory, so read access on the snapshot SkImage could be cheap.
// Lock the shared pixel ref to ensure peekPixels() is usable.
return SkMakeImageFromRasterBitmap(fBitmap, cpm);
}
void SkSurface_Raster::onRestoreBackingMutability() {
SkASSERT(!this->hasCachedImage()); // Shouldn't be any snapshots out there.
if (SkPixelRef* pr = fBitmap.pixelRef()) {
pr->restoreMutability();
}
}
void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
// are we sharing pixelrefs with the image?
sk_sp<SkImage> cached(this->refCachedImage());
SkASSERT(cached);
if (SkBitmapImageGetPixelRef(cached.get()) == fBitmap.pixelRef()) {
SkASSERT(fWeOwnThePixels);
if (kDiscard_ContentChangeMode == mode) {
fBitmap.allocPixels();
} else {
SkBitmap prev(fBitmap);
fBitmap.allocPixels();
SkASSERT(prev.info() == fBitmap.info());
SkASSERT(prev.rowBytes() == fBitmap.rowBytes());
memcpy(fBitmap.getPixels(), prev.getPixels(), fBitmap.computeByteSize());
}
SkASSERT(fBitmap.rowBytes() == fRowBytes); // be sure we always use the same value
// Now fBitmap is a deep copy of itself (and therefore different from
// what is being used by the image. Next we update the canvas to use
// this as its backend, so we can't modify the image's pixels anymore.
SkASSERT(this->getCachedCanvas());
this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap);
}
}
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkSurface> SkSurface::MakeRasterDirectReleaseProc(const SkImageInfo& info, void* pixels,
size_t rb, void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps* props) {
if (nullptr == releaseProc) {
context = nullptr;
}
if (!SkSurfaceValidateRasterInfo(info, rb)) {
return nullptr;
}
if (nullptr == pixels) {
return nullptr;
}
return sk_make_sp<SkSurface_Raster>(info, pixels, rb, releaseProc, context, props);
}
sk_sp<SkSurface> SkSurface::MakeRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes,
const SkSurfaceProps* props) {
return MakeRasterDirectReleaseProc(info, pixels, rowBytes, nullptr, nullptr, props);
}
sk_sp<SkSurface> SkSurface::MakeRaster(const SkImageInfo& info, size_t rowBytes,
const SkSurfaceProps* props) {
if (!SkSurfaceValidateRasterInfo(info)) {
return nullptr;
}
sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeZeroed(info, rowBytes);
if (!pr) {
return nullptr;
}
if (rowBytes) {
SkASSERT(pr->rowBytes() == rowBytes);
}
return sk_make_sp<SkSurface_Raster>(info, std::move(pr), props);
}
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