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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 "SkBitmap.h"
#include "SkCanvas.h"
#include "SkImageGenerator.h"
#include "SkImagePriv.h"
#include "SkImage_Base.h"
#include "SkReadPixelsRec.h"
#include "SkString.h"
#include "SkSurface.h"
uint32_t SkImage::NextUniqueID() {
static int32_t gUniqueID;
// never return 0;
uint32_t id;
do {
id = sk_atomic_inc(&gUniqueID) + 1;
} while (0 == id);
return id;
}
const void* SkImage::peekPixels(SkImageInfo* info, size_t* rowBytes) const {
SkImageInfo infoStorage;
size_t rowBytesStorage;
if (NULL == info) {
info = &infoStorage;
}
if (NULL == rowBytes) {
rowBytes = &rowBytesStorage;
}
return as_IB(this)->onPeekPixels(info, rowBytes);
}
bool SkImage::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) const {
SkReadPixelsRec rec(dstInfo, dstPixels, dstRowBytes, srcX, srcY);
if (!rec.trim(this->width(), this->height())) {
return false;
}
return as_IB(this)->onReadPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, rec.fX, rec.fY);
}
GrTexture* SkImage::getTexture() const {
return as_IB(this)->onGetTexture();
}
SkShader* SkImage::newShader(SkShader::TileMode tileX,
SkShader::TileMode tileY,
const SkMatrix* localMatrix) const {
return as_IB(this)->onNewShader(tileX, tileY, localMatrix);
}
SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
SkBitmap bm;
if (as_IB(this)->getROPixels(&bm)) {
return SkImageEncoder::EncodeData(bm, type, quality);
}
return NULL;
}
SkImage* SkImage::NewFromData(SkData* data) {
if (NULL == data) {
return NULL;
}
SkImageGenerator* generator = SkImageGenerator::NewFromData(data);
return generator ? SkImage::NewFromGenerator(generator) : NULL;
}
SkSurface* SkImage::newSurface(const SkImageInfo& info, const SkSurfaceProps* props) const {
if (NULL == props) {
props = &as_IB(this)->props();
}
return as_IB(this)->onNewSurface(info, *props);
}
const char* SkImage::toString(SkString* str) const {
str->appendf("image: (id:%d (%d, %d) %s)", this->uniqueID(), this->width(), this->height(),
this->isOpaque() ? "opaque" : "");
return str->c_str();
}
SkImage* SkImage::newImage(int newWidth, int newHeight, const SkIRect* subset,
SkFilterQuality quality) const {
if (newWidth <= 0 || newHeight <= 0) {
return NULL;
}
const SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
if (subset) {
if (!bounds.contains(*subset)) {
return NULL;
}
if (bounds == *subset) {
subset = NULL; // and fall through to check below
}
}
if (NULL == subset && this->width() == newWidth && this->height() == newHeight) {
return SkRef(const_cast<SkImage*>(this));
}
return as_IB(this)->onNewImage(newWidth, newHeight, subset, quality);
}
///////////////////////////////////////////////////////////////////////////////
static bool raster_canvas_supports(const SkImageInfo& info) {
switch (info.colorType()) {
case kN32_SkColorType:
return kUnpremul_SkAlphaType != info.alphaType();
case kRGB_565_SkColorType:
return true;
case kAlpha_8_SkColorType:
return true;
default:
break;
}
return false;
}
bool SkImage_Base::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) const {
if (!raster_canvas_supports(dstInfo)) {
return false;
}
SkBitmap bm;
bm.installPixels(dstInfo, dstPixels, dstRowBytes);
SkCanvas canvas(bm);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawImage(this, -SkIntToScalar(srcX), -SkIntToScalar(srcY), &paint);
return true;
}
SkImage* SkImage_Base::onNewImage(int newWidth, int newHeight, const SkIRect* subset,
SkFilterQuality quality) const {
const bool opaque = this->isOpaque();
const SkImageInfo info = SkImageInfo::Make(newWidth, newHeight, kN32_SkColorType,
opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
SkAutoTUnref<SkSurface> surface(this->newSurface(info, NULL));
if (!surface.get()) {
return NULL;
}
SkRect src;
if (subset) {
src.set(*subset);
} else {
src = SkRect::MakeIWH(this->width(), this->height());
}
surface->getCanvas()->scale(newWidth / src.width(), newHeight / src.height());
surface->getCanvas()->translate(-src.x(), -src.y());
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
paint.setFilterQuality(quality);
surface->getCanvas()->drawImage(this, 0, 0, &paint);
return surface->newImageSnapshot();
}
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