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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 "SkMallocPixelRef.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_SkColorType) {
return false;
}
if ((unsigned)info.fAlphaType > (unsigned)kLastEnum_SkAlphaType) {
return false;
}
if (kUnknown_SkColorType == info.colorType()) {
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 SkImageInfo&, SkData*, size_t rb);
virtual ~SkImage_Raster();
virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
virtual bool onReadPixels(SkBitmap*, const SkIRect&) const SK_OVERRIDE;
virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
// exposed for SkSurface_Raster via SkNewImageFromPixelRef
SkImage_Raster(const SkImageInfo&, 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;
}
static void release_data(void* addr, void* context) {
SkData* data = static_cast<SkData*>(context);
data->unref();
}
SkImage_Raster::SkImage_Raster(const Info& info, SkData* data, size_t rowBytes)
: INHERITED(info.fWidth, info.fHeight)
{
data->ref();
void* addr = const_cast<void*>(data->data());
SkColorTable* ctable = NULL;
fBitmap.installPixels(info, addr, rowBytes, ctable, release_data, data);
fBitmap.setImmutable();
fBitmap.lockPixels();
}
SkImage_Raster::SkImage_Raster(const Info& info, SkPixelRef* pr, size_t rowBytes)
: INHERITED(info.fWidth, info.fHeight)
{
fBitmap.setInfo(info, rowBytes);
fBitmap.setPixelRef(pr);
fBitmap.lockPixels();
}
SkImage_Raster::~SkImage_Raster() {}
void SkImage_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
canvas->drawBitmap(fBitmap, x, y, paint);
}
void SkImage_Raster::onDrawRectToRect(SkCanvas* canvas, const SkRect* src,
const SkRect& dst, const SkPaint* paint) {
canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
}
bool SkImage_Raster::onReadPixels(SkBitmap* dst, const SkIRect& subset) const {
if (dst->pixelRef()) {
return this->INHERITED::onReadPixels(dst, subset);
} else {
SkBitmap src;
if (!fBitmap.extractSubset(&src, subset)) {
return false;
}
return src.copyTo(dst, src.colorType());
}
}
const void* SkImage_Raster::onPeekPixels(SkImageInfo* infoPtr,
size_t* rowBytesPtr) const {
const SkImageInfo info = fBitmap.info();
if ((kUnknown_SkColorType == info.colorType()) || !fBitmap.getPixels()) {
return NULL;
}
*infoPtr = info;
*rowBytesPtr = fBitmap.rowBytes();
return fBitmap.getPixels();
}
bool SkImage_Raster::getROPixels(SkBitmap* dst) const {
*dst = fBitmap;
return true;
}
///////////////////////////////////////////////////////////////////////////////
SkImage* SkImage::NewRasterCopy(const SkImageInfo& 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 SkImageInfo& info, SkData* data, 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 == data) {
return NULL;
}
// did they give us enough data?
size_t size = info.fHeight * rowBytes;
if (data->size() < size) {
return NULL;
}
return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
}
SkImage* SkNewImageFromPixelRef(const SkImageInfo& 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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