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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 "SkImage_Base.h"
#include "SkImagePriv.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkDataPixelRef.h"
class SkImage_Raster : public SkImage_Base {
public:
static bool ValidArgs(const Info& info, size_t rowBytes) {
const int maxDimension = SK_MaxS32 >> 2;
const size_t kMaxPixelByteSize = SK_MaxS32;
if (info.fWidth < 0 || info.fHeight < 0) {
return false;
}
if (info.fWidth > maxDimension || info.fHeight > maxDimension) {
return false;
}
if ((unsigned)info.fColorType > (unsigned)kLastEnum_ColorType) {
return false;
}
if ((unsigned)info.fAlphaType > (unsigned)kLastEnum_AlphaType) {
return false;
}
bool isOpaque;
if (SkImageInfoToBitmapConfig(info, &isOpaque) == SkBitmap::kNo_Config) {
return false;
}
// TODO: check colorspace
if (rowBytes < SkImageMinRowBytes(info)) {
return false;
}
int64_t size = (int64_t)info.fHeight * rowBytes;
if (size > (int64_t)kMaxPixelByteSize) {
return false;
}
return true;
}
static SkImage* NewEmpty();
SkImage_Raster(const SkImage::Info&, SkData*, size_t rb);
virtual ~SkImage_Raster();
virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
// exposed for SkSurface_Raster via SkNewImageFromPixelRef
SkImage_Raster(const SkImage::Info&, SkPixelRef*, size_t rowBytes);
SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
private:
SkImage_Raster() : INHERITED(0, 0) {}
SkBitmap fBitmap;
typedef SkImage_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
SkImage* SkImage_Raster::NewEmpty() {
// Returns lazily created singleton
static SkImage* gEmpty;
if (NULL == gEmpty) {
gEmpty = SkNEW(SkImage_Raster);
}
gEmpty->ref();
return gEmpty;
}
SkImage_Raster::SkImage_Raster(const Info& info, SkData* data, size_t rowBytes)
: INHERITED(info.fWidth, info.fHeight) {
bool isOpaque;
SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque);
fBitmap.setConfig(config, info.fWidth, info.fHeight, rowBytes);
fBitmap.setPixelRef(SkNEW_ARGS(SkDataPixelRef, (data)))->unref();
fBitmap.setIsOpaque(isOpaque);
fBitmap.setImmutable();
}
SkImage_Raster::SkImage_Raster(const Info& info, SkPixelRef* pr, size_t rowBytes)
: INHERITED(info.fWidth, info.fHeight) {
bool isOpaque;
SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque);
fBitmap.setConfig(config, info.fWidth, info.fHeight, rowBytes);
fBitmap.setPixelRef(pr);
fBitmap.setIsOpaque(isOpaque);
fBitmap.setImmutable();
}
SkImage_Raster::~SkImage_Raster() {}
void SkImage_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
canvas->drawBitmap(fBitmap, x, y, paint);
}
///////////////////////////////////////////////////////////////////////////////
SkImage* SkImage::NewRasterCopy(const SkImage::Info& info, const void* pixels, size_t rowBytes) {
if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
return NULL;
}
if (0 == info.fWidth && 0 == info.fHeight) {
return SkImage_Raster::NewEmpty();
}
// check this after empty-check
if (NULL == pixels) {
return NULL;
}
// Here we actually make a copy of the caller's pixel data
SkAutoDataUnref data(SkData::NewWithCopy(pixels, info.fHeight * rowBytes));
return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
}
SkImage* SkImage::NewRasterData(const SkImage::Info& info, SkData* pixelData, size_t rowBytes) {
if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
return NULL;
}
if (0 == info.fWidth && 0 == info.fHeight) {
return SkImage_Raster::NewEmpty();
}
// check this after empty-check
if (NULL == pixelData) {
return NULL;
}
// did they give us enough data?
size_t size = info.fHeight * rowBytes;
if (pixelData->size() < size) {
return NULL;
}
SkAutoDataUnref data(pixelData);
return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
}
SkImage* SkNewImageFromPixelRef(const SkImage::Info& info, SkPixelRef* pr,
size_t rowBytes) {
return SkNEW_ARGS(SkImage_Raster, (info, pr, rowBytes));
}
SkPixelRef* SkBitmapImageGetPixelRef(SkImage* image) {
return ((SkImage_Raster*)image)->getPixelRef();
}
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