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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"
///////////////////////////////////////////////////////////////////////////////
SkSurface_Base::SkSurface_Base(int width, int height) : INHERITED(width, height) {
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();
if (image) {
image->draw(canvas, x, y, paint);
image->unref();
}
}
void SkSurface_Base::aboutToDraw(ContentChangeMode mode) {
this->dirtyGenerationID();
if (NULL != fCachedCanvas) {
SkASSERT(fCachedCanvas->getSurfaceBase() == this || \
NULL == fCachedCanvas->getSurfaceBase());
fCachedCanvas->setSurfaceBase(NULL);
}
if (NULL != 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).
if (!fCachedImage->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;
}
}
uint32_t SkSurface_Base::newGenerationID() {
this->installIntoCanvasForDirtyNotification();
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) : fWidth(width), fHeight(height) {
SkASSERT(width >= 0);
SkASSERT(height >= 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() {
SkImage* image = asSB(this)->getCachedImage();
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);
}
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