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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 "GrBackendSurface.h"
#include "SkCanvas.h"
#include "SkFontLCDConfig.h"
#include "SkImagePriv.h"
#include "SkSurface_Base.h"
#include <atomic>
static SkPixelGeometry compute_default_geometry() {
SkFontLCDConfig::LCDOrder order = SkFontLCDConfig::GetSubpixelOrder();
if (SkFontLCDConfig::kNONE_LCDOrder == order) {
return kUnknown_SkPixelGeometry;
} else {
// Bit0 is RGB(0), BGR(1)
// Bit1 is H(0), V(1)
const SkPixelGeometry gGeo[] = {
kRGB_H_SkPixelGeometry,
kBGR_H_SkPixelGeometry,
kRGB_V_SkPixelGeometry,
kBGR_V_SkPixelGeometry,
};
int index = 0;
if (SkFontLCDConfig::kBGR_LCDOrder == order) {
index |= 1;
}
if (SkFontLCDConfig::kVertical_LCDOrientation == SkFontLCDConfig::GetSubpixelOrientation()){
index |= 2;
}
return gGeo[index];
}
}
SkSurfaceProps::SkSurfaceProps() : fFlags(0), fPixelGeometry(kUnknown_SkPixelGeometry) {}
SkSurfaceProps::SkSurfaceProps(InitType) : fFlags(0), fPixelGeometry(compute_default_geometry()) {}
SkSurfaceProps::SkSurfaceProps(uint32_t flags, InitType)
: fFlags(flags)
, fPixelGeometry(compute_default_geometry())
{}
SkSurfaceProps::SkSurfaceProps(uint32_t flags, SkPixelGeometry pg)
: fFlags(flags), fPixelGeometry(pg)
{}
SkSurfaceProps::SkSurfaceProps(const SkSurfaceProps& other)
: fFlags(other.fFlags)
, fPixelGeometry(other.fPixelGeometry)
{}
///////////////////////////////////////////////////////////////////////////////
SkSurface_Base::SkSurface_Base(int width, int height, const SkSurfaceProps* props)
: INHERITED(width, height, props) {
}
SkSurface_Base::SkSurface_Base(const SkImageInfo& info, const SkSurfaceProps* props)
: INHERITED(info, props) {
}
SkSurface_Base::~SkSurface_Base() {
// in case the canvas outsurvives us, we null the callback
if (fCachedCanvas) {
fCachedCanvas->setSurfaceBase(nullptr);
}
}
GrBackendTexture SkSurface_Base::onGetBackendTexture(BackendHandleAccess) {
return GrBackendTexture(); // invalid
}
GrBackendRenderTarget SkSurface_Base::onGetBackendRenderTarget(BackendHandleAccess) {
return GrBackendRenderTarget(); // invalid
}
void SkSurface_Base::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
auto image = this->makeImageSnapshot();
if (image) {
canvas->drawImage(image, x, y, paint);
}
}
bool SkSurface_Base::outstandingImageSnapshot() const {
return fCachedImage && !fCachedImage->unique();
}
void SkSurface_Base::aboutToDraw(ContentChangeMode mode) {
this->dirtyGenerationID();
SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this);
if (fCachedImage) {
// the surface may need to fork its backend, if its sharing it with
// the cached image. Note: we only call if there is an outstanding owner
// on the image (besides us).
bool unique = fCachedImage->unique();
if (!unique) {
this->onCopyOnWrite(mode);
}
// regardless of copy-on-write, we must drop our cached image now, so
// that the next request will get our new contents.
fCachedImage.reset();
if (unique) {
// Our content isn't held by any image now, so we can consider that content mutable.
// Raster surfaces need to be told it's safe to consider its pixels mutable again.
// We make this call after the ->unref() so the subclass can assert there are no images.
this->onRestoreBackingMutability();
}
} else if (kDiscard_ContentChangeMode == mode) {
this->onDiscard();
}
}
uint32_t SkSurface_Base::newGenerationID() {
SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this);
static std::atomic<uint32_t> nextID{1};
return nextID++;
}
static SkSurface_Base* asSB(SkSurface* surface) {
return static_cast<SkSurface_Base*>(surface);
}
///////////////////////////////////////////////////////////////////////////////
SkSurface::SkSurface(int width, int height, const SkSurfaceProps* props)
: fProps(SkSurfacePropsCopyOrDefault(props)), fWidth(width), fHeight(height)
{
SkASSERT(fWidth > 0);
SkASSERT(fHeight > 0);
fGenerationID = 0;
}
SkSurface::SkSurface(const SkImageInfo& info, const SkSurfaceProps* props)
: fProps(SkSurfacePropsCopyOrDefault(props)), fWidth(info.width()), fHeight(info.height())
{
SkASSERT(fWidth > 0);
SkASSERT(fHeight > 0);
fGenerationID = 0;
}
uint32_t SkSurface::generationID() {
if (0 == fGenerationID) {
fGenerationID = asSB(this)->newGenerationID();
}
return fGenerationID;
}
void SkSurface::notifyContentWillChange(ContentChangeMode mode) {
asSB(this)->aboutToDraw(mode);
}
SkCanvas* SkSurface::getCanvas() {
return asSB(this)->getCachedCanvas();
}
sk_sp<SkImage> SkSurface::makeImageSnapshot() {
return asSB(this)->refCachedImage();
}
sk_sp<SkImage> SkSurface::makeImageSnapshot(const SkIRect& srcBounds) {
const SkIRect surfBounds = { 0, 0, fWidth, fHeight };
SkIRect bounds = srcBounds;
if (!bounds.intersect(surfBounds)) {
return nullptr;
}
SkASSERT(!bounds.isEmpty());
if (bounds == surfBounds) {
return this->makeImageSnapshot();
} else {
return asSB(this)->onNewImageSnapshot(&bounds);
}
}
sk_sp<SkSurface> SkSurface::makeSurface(const SkImageInfo& info) {
return asSB(this)->onNewSurface(info);
}
void SkSurface::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
return asSB(this)->onDraw(canvas, x, y, paint);
}
bool SkSurface::peekPixels(SkPixmap* pmap) {
return this->getCanvas()->peekPixels(pmap);
}
bool SkSurface::readPixels(const SkPixmap& pm, int srcX, int srcY) {
return this->getCanvas()->readPixels(pm, srcX, srcY);
}
bool SkSurface::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) {
return this->readPixels({dstInfo, dstPixels, dstRowBytes}, srcX, srcY);
}
bool SkSurface::readPixels(const SkBitmap& bitmap, int srcX, int srcY) {
SkPixmap pm;
return bitmap.peekPixels(&pm) && this->readPixels(pm, srcX, srcY);
}
void SkSurface::writePixels(const SkPixmap& pmap, int x, int y) {
if (pmap.addr() == nullptr || pmap.width() <= 0 || pmap.height() <= 0) {
return;
}
const SkIRect srcR = SkIRect::MakeXYWH(x, y, pmap.width(), pmap.height());
const SkIRect dstR = SkIRect::MakeWH(this->width(), this->height());
if (SkIRect::Intersects(srcR, dstR)) {
ContentChangeMode mode = kRetain_ContentChangeMode;
if (srcR.contains(dstR)) {
mode = kDiscard_ContentChangeMode;
}
asSB(this)->aboutToDraw(mode);
asSB(this)->onWritePixels(pmap, x, y);
}
}
void SkSurface::writePixels(const SkBitmap& src, int x, int y) {
SkPixmap pm;
if (src.peekPixels(&pm)) {
this->writePixels(pm, x, y);
}
}
GrBackendTexture SkSurface::getBackendTexture(BackendHandleAccess access) {
return asSB(this)->onGetBackendTexture(access);
}
GrBackendRenderTarget SkSurface::getBackendRenderTarget(BackendHandleAccess access) {
return asSB(this)->onGetBackendRenderTarget(access);
}
void SkSurface::prepareForExternalIO() {
this->flush();
}
void SkSurface::flush() {
asSB(this)->onFlush(0, nullptr);
}
GrSemaphoresSubmitted SkSurface::flushAndSignalSemaphores(int numSemaphores,
GrBackendSemaphore signalSemaphores[]) {
return asSB(this)->onFlush(numSemaphores, signalSemaphores);
}
bool SkSurface::wait(int numSemaphores, const GrBackendSemaphore* waitSemaphores) {
return asSB(this)->onWait(numSemaphores, waitSemaphores);
}
bool SkSurface::characterize(SkSurfaceCharacterization* characterization) const {
return asSB(const_cast<SkSurface*>(this))->onCharacterize(characterization);
}
bool SkSurface::draw(SkDeferredDisplayList* ddl) {
return asSB(this)->onDraw(ddl);
}
//////////////////////////////////////////////////////////////////////////////////////
#include "SkNoDrawCanvas.h"
class SkNullSurface : public SkSurface_Base {
public:
SkNullSurface(int width, int height) : SkSurface_Base(width, height, nullptr) {}
protected:
SkCanvas* onNewCanvas() override {
return new SkNoDrawCanvas(this->width(), this->height());
}
sk_sp<SkSurface> onNewSurface(const SkImageInfo& info) override {
return MakeNull(info.width(), info.height());
}
sk_sp<SkImage> onNewImageSnapshot(const SkIRect* subsetOrNull) override { return nullptr; }
void onWritePixels(const SkPixmap&, int x, int y) override {}
void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override {}
void onCopyOnWrite(ContentChangeMode) override {}
};
sk_sp<SkSurface> SkSurface::MakeNull(int width, int height) {
if (width < 1 || height < 1) {
return nullptr;
}
return sk_sp<SkSurface>(new SkNullSurface(width, height));
}
//////////////////////////////////////////////////////////////////////////////////////
#if !SK_SUPPORT_GPU
sk_sp<SkSurface> SkSurface::MakeRenderTarget(GrContext*, SkBudgeted, const SkImageInfo&, int,
GrSurfaceOrigin, const SkSurfaceProps*, bool) {
return nullptr;
}
sk_sp<SkSurface> SkSurface::MakeRenderTarget(GrContext*, const SkSurfaceCharacterization&,
SkBudgeted) {
return nullptr;
}
sk_sp<SkSurface> SkSurface::MakeFromBackendTexture(GrContext*, const GrBackendTexture&,
GrSurfaceOrigin origin, int sampleCnt,
SkColorType, sk_sp<SkColorSpace>,
const SkSurfaceProps*) {
return nullptr;
}
sk_sp<SkSurface> SkSurface::MakeFromBackendRenderTarget(GrContext*,
const GrBackendRenderTarget&,
GrSurfaceOrigin origin,
SkColorType,
sk_sp<SkColorSpace>,
const SkSurfaceProps*) {
return nullptr;
}
sk_sp<SkSurface> SkSurface::MakeFromBackendTextureAsRenderTarget(GrContext*,
const GrBackendTexture&,
GrSurfaceOrigin origin,
int sampleCnt,
SkColorType,
sk_sp<SkColorSpace>,
const SkSurfaceProps*) {
return nullptr;
}
#endif