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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"
static const size_t kIgnoreRowBytesValue = (size_t)~0;
class SkSurface_Raster : public SkSurface_Base {
public:
static bool Valid(const SkImageInfo&, size_t rb = kIgnoreRowBytesValue);
SkSurface_Raster(const SkImageInfo&, void*, size_t rb,
void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps*);
SkSurface_Raster(SkPixelRef*, const SkSurfaceProps*);
SkCanvas* onNewCanvas() override;
SkSurface* onNewSurface(const SkImageInfo&) override;
SkImage* onNewImageSnapshot(Budgeted) override;
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
const SkPaint*) override;
void onCopyOnWrite(ContentChangeMode) override;
private:
SkBitmap fBitmap;
bool fWeOwnThePixels;
typedef SkSurface_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
bool SkSurface_Raster::Valid(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:
shift = 0;
break;
case kRGB_565_SkColorType:
shift = 1;
break;
case kN32_SkColorType:
shift = 2;
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, NULL, releaseProc, context);
fWeOwnThePixels = false; // We are "Direct"
}
SkSurface_Raster::SkSurface_Raster(SkPixelRef* pr, const SkSurfaceProps* props)
: INHERITED(pr->info().width(), pr->info().height(), props)
{
const SkImageInfo& info = pr->info();
fBitmap.setInfo(info, info.minRowBytes());
fBitmap.setPixelRef(pr);
fWeOwnThePixels = true;
if (!info.isOpaque()) {
fBitmap.eraseColor(SK_ColorTRANSPARENT);
}
}
SkCanvas* SkSurface_Raster::onNewCanvas() {
return SkNEW_ARGS(SkCanvas, (fBitmap, this->props()));
}
SkSurface* SkSurface_Raster::onNewSurface(const SkImageInfo& info) {
return SkSurface::NewRaster(info);
}
void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
canvas->drawBitmap(fBitmap, x, y, paint);
}
SkImage* SkSurface_Raster::onNewImageSnapshot(Budgeted) {
return SkNewImageFromBitmap(fBitmap, fWeOwnThePixels, &this->props());
}
void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
// are we sharing pixelrefs with the image?
SkASSERT(this->getCachedImage(kNo_Budgeted));
if (SkBitmapImageGetPixelRef(this->getCachedImage(kNo_Budgeted)) == fBitmap.pixelRef()) {
SkASSERT(fWeOwnThePixels);
if (kDiscard_ContentChangeMode == mode) {
fBitmap.setPixelRef(NULL);
fBitmap.allocPixels();
} else {
SkBitmap prev(fBitmap);
prev.deepCopyTo(&fBitmap);
}
// 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);
}
}
///////////////////////////////////////////////////////////////////////////////
SkSurface* SkSurface::NewRasterDirectReleaseProc(const SkImageInfo& info, void* pixels, size_t rb,
void (*releaseProc)(void* pixels, void* context),
void* context, const SkSurfaceProps* props) {
if (NULL == releaseProc) {
context = NULL;
}
if (!SkSurface_Raster::Valid(info, rb)) {
return NULL;
}
if (NULL == pixels) {
return NULL;
}
return SkNEW_ARGS(SkSurface_Raster, (info, pixels, rb, releaseProc, context, props));
}
SkSurface* SkSurface::NewRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes,
const SkSurfaceProps* props) {
return NewRasterDirectReleaseProc(info, pixels, rowBytes, NULL, NULL, props);
}
SkSurface* SkSurface::NewRaster(const SkImageInfo& info, const SkSurfaceProps* props) {
if (!SkSurface_Raster::Valid(info)) {
return NULL;
}
SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewAllocate(info, 0, NULL));
if (NULL == pr.get()) {
return NULL;
}
return SkNEW_ARGS(SkSurface_Raster, (pr, props));
}
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