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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);
SkSurface_Raster(const SkImageInfo&, SkPixelRef*, size_t rb);
virtual SkCanvas* onNewCanvas() SK_OVERRIDE;
virtual SkSurface* onNewSurface(const SkImageInfo&) SK_OVERRIDE;
virtual SkImage* onNewImageSnapshot() SK_OVERRIDE;
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
const SkPaint*) SK_OVERRIDE;
virtual void onCopyOnWrite(ContentChangeMode) SK_OVERRIDE;
private:
SkBitmap fBitmap;
bool fWeOwnThePixels;
typedef SkSurface_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
bool SkSurface_Raster::Valid(const SkImageInfo& info, size_t rowBytes) {
static const size_t kMaxTotalSize = SK_MaxS32;
SkBitmap::Config config = SkImageInfoToBitmapConfig(info);
int shift = 0;
switch (config) {
case SkBitmap::kA8_Config:
shift = 0;
break;
case SkBitmap::kRGB_565_Config:
shift = 1;
break;
case SkBitmap::kARGB_8888_Config:
shift = 2;
break;
default:
return false;
}
// TODO: examine colorspace
if (kIgnoreRowBytesValue == rowBytes) {
return true;
}
uint64_t minRB = (uint64_t)info.fWidth << shift;
if (minRB > rowBytes) {
return false;
}
size_t alignedRowBytes = rowBytes >> shift << shift;
if (alignedRowBytes != rowBytes) {
return false;
}
uint64_t size = (uint64_t)info.fHeight * rowBytes;
if (size > kMaxTotalSize) {
return false;
}
return true;
}
SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, void* pixels, size_t rb)
: INHERITED(info.fWidth, info.fHeight) {
SkBitmap::Config config = SkImageInfoToBitmapConfig(info);
fBitmap.setConfig(config, info.fWidth, info.fHeight, rb, info.fAlphaType);
fBitmap.setPixels(pixels);
fWeOwnThePixels = false; // We are "Direct"
}
SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, SkPixelRef* pr, size_t rb)
: INHERITED(info.fWidth, info.fHeight) {
SkBitmap::Config config = SkImageInfoToBitmapConfig(info);
fBitmap.setConfig(config, info.fWidth, info.fHeight, rb, info.fAlphaType);
fBitmap.setPixelRef(pr);
fWeOwnThePixels = true;
if (!SkAlphaTypeIsOpaque(info.fAlphaType)) {
fBitmap.eraseColor(SK_ColorTRANSPARENT);
}
}
SkCanvas* SkSurface_Raster::onNewCanvas() {
return SkNEW_ARGS(SkCanvas, (fBitmap));
}
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() {
return SkNewImageFromBitmap(fBitmap, fWeOwnThePixels);
}
void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
// are we sharing pixelrefs with the image?
SkASSERT(NULL != this->getCachedImage());
if (SkBitmapImageGetPixelRef(this->getCachedImage()) == fBitmap.pixelRef()) {
SkASSERT(fWeOwnThePixels);
if (kDiscard_ContentChangeMode == mode) {
fBitmap.setPixelRef(NULL, 0);
fBitmap.allocPixels();
} else {
SkBitmap prev(fBitmap);
prev.deepCopyTo(&fBitmap, prev.config());
}
// 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(NULL != this->getCachedCanvas());
this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap);
}
}
///////////////////////////////////////////////////////////////////////////////
SkSurface* SkSurface::NewRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes) {
if (!SkSurface_Raster::Valid(info, rowBytes)) {
return NULL;
}
if (NULL == pixels) {
return NULL;
}
return SkNEW_ARGS(SkSurface_Raster, (info, pixels, rowBytes));
}
SkSurface* SkSurface::NewRaster(const SkImageInfo& info) {
if (!SkSurface_Raster::Valid(info)) {
return NULL;
}
static const size_t kMaxTotalSize = SK_MaxS32;
size_t rowBytes = SkImageMinRowBytes(info);
uint64_t size64 = (uint64_t)info.fHeight * rowBytes;
if (size64 > kMaxTotalSize) {
return NULL;
}
size_t size = (size_t)size64;
void* pixels = sk_malloc_throw(size);
if (NULL == pixels) {
return NULL;
}
SkAutoTUnref<SkPixelRef> pr(SkNEW_ARGS(SkMallocPixelRef, (pixels, size, NULL, true)));
return SkNEW_ARGS(SkSurface_Raster, (info, pr, rowBytes));
}
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