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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 "SkFontLCDConfig.h"
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)
{
fCachedCanvas = NULL;
fCachedImage = NULL;
}
SkSurface_Base::SkSurface_Base(const SkImageInfo& info, const SkSurfaceProps* props)
: INHERITED(info, props)
{
fCachedCanvas = NULL;
fCachedImage = NULL;
}
SkSurface_Base::~SkSurface_Base() {
// in case the canvas outsurvives us, we null the callback
if (fCachedCanvas) {
fCachedCanvas->setSurfaceBase(NULL);
}
SkSafeUnref(fCachedImage);
SkSafeUnref(fCachedCanvas);
}
void SkSurface_Base::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
SkImage* image = this->newImageSnapshot(kYes_Budgeted);
if (image) {
canvas->drawImage(image, x, y, paint);
image->unref();
}
}
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->unref();
fCachedImage = NULL;
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 int32_t gID;
return sk_atomic_inc(&gID) + 1;
}
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();
}
SkImage* SkSurface::newImageSnapshot(Budgeted budgeted) {
SkImage* image = asSB(this)->getCachedImage(budgeted);
SkSafeRef(image); // the caller will call unref() to balance this
return image;
}
SkSurface* SkSurface::newSurface(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);
}
const void* SkSurface::peekPixels(SkImageInfo* info, size_t* rowBytes) {
return this->getCanvas()->peekPixels(info, rowBytes);
}
bool SkSurface::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) {
return this->getCanvas()->readPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY);
}
GrBackendObject SkSurface::getTextureHandle(BackendHandleAccess access) {
return asSB(this)->onGetTextureHandle(access);
}
bool SkSurface::getRenderTargetHandle(GrBackendObject* obj, BackendHandleAccess access) {
return asSB(this)->onGetRenderTargetHandle(obj, access);
}
//////////////////////////////////////////////////////////////////////////////////////
#if !SK_SUPPORT_GPU
SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget*, const SkSurfaceProps*) {
return NULL;
}
SkSurface* SkSurface::NewRenderTarget(GrContext*, Budgeted, const SkImageInfo&, int,
const SkSurfaceProps*) {
return NULL;
}
SkSurface* SkSurface::NewFromBackendTexture(GrContext*, const GrBackendTextureDesc&,
const SkSurfaceProps*) {
return NULL;
}
SkSurface* SkSurface::NewFromBackendRenderTarget(GrContext*, const GrBackendRenderTargetDesc&,
const SkSurfaceProps*) {
return NULL;
}
#endif
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