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/*
* Copyright 2015 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 "SkImageGenerator.h"
#include "SkCanvas.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPicture.h"
#include "SkSurface.h"
#include "SkTLazy.h"
class SkPictureImageGenerator : SkImageGenerator {
public:
static SkImageGenerator* Create(const SkISize&, const SkPicture*, const SkMatrix*,
const SkPaint*);
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor ctable[],
int* ctableCount) override;
bool onComputeScaledDimensions(SkScalar scale, SupportedSizes*) override;
bool onGenerateScaledPixels(const SkISize&, const SkIPoint&, const SkPixmap&) override;
#if SK_SUPPORT_GPU
GrTexture* onGenerateTexture(GrContext*, const SkIRect*) override;
#endif
private:
SkPictureImageGenerator(const SkISize&, const SkPicture*, const SkMatrix*, const SkPaint*);
SkAutoTUnref<const SkPicture> fPicture;
SkMatrix fMatrix;
SkTLazy<SkPaint> fPaint;
typedef SkImageGenerator INHERITED;
};
SkImageGenerator* SkPictureImageGenerator::Create(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint) {
if (!picture || size.isEmpty()) {
return nullptr;
}
return new SkPictureImageGenerator(size, picture, matrix, paint);
}
SkPictureImageGenerator::SkPictureImageGenerator(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint)
: INHERITED(SkImageInfo::MakeN32Premul(size))
, fPicture(SkRef(picture)) {
if (matrix) {
fMatrix = *matrix;
} else {
fMatrix.reset();
}
if (paint) {
fPaint.set(*paint);
}
}
bool SkPictureImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount) {
if (info != getInfo() || ctable || ctableCount) {
return false;
}
SkBitmap bitmap;
if (!bitmap.installPixels(info, pixels, rowBytes)) {
return false;
}
bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
canvas.drawPicture(fPicture, &fMatrix, fPaint.getMaybeNull());
return true;
}
bool SkPictureImageGenerator::onComputeScaledDimensions(SkScalar scale,
SupportedSizes* sizes) {
SkASSERT(scale > 0 && scale <= 1);
const int w = this->getInfo().width();
const int h = this->getInfo().height();
const int sw = SkScalarRoundToInt(scale * w);
const int sh = SkScalarRoundToInt(scale * h);
if (sw > 0 && sh > 0) {
sizes->fSizes[0].set(sw, sh);
sizes->fSizes[1].set(sw, sh);
return true;
}
return false;
}
bool SkPictureImageGenerator::onGenerateScaledPixels(const SkISize& scaledSize,
const SkIPoint& scaledOrigin,
const SkPixmap& scaledPixels) {
int w = scaledSize.width();
int h = scaledSize.height();
const SkScalar scaleX = SkIntToScalar(w) / this->getInfo().width();
const SkScalar scaleY = SkIntToScalar(h) / this->getInfo().height();
SkMatrix matrix = SkMatrix::MakeScale(scaleX, scaleY);
matrix.postTranslate(-SkIntToScalar(scaledOrigin.x()), -SkIntToScalar(scaledOrigin.y()));
SkBitmap bitmap;
if (!bitmap.installPixels(scaledPixels)) {
return false;
}
bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
matrix.preConcat(fMatrix);
canvas.drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
SkImageGenerator* SkImageGenerator::NewFromPicture(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint) {
return SkPictureImageGenerator::Create(size, picture, matrix, paint);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "GrTexture.h"
GrTexture* SkPictureImageGenerator::onGenerateTexture(GrContext* ctx, const SkIRect* subset) {
const SkImageInfo& info = this->getInfo();
SkImageInfo surfaceInfo = subset ? info.makeWH(subset->width(), subset->height()) : info;
//
// TODO: respect the usage, by possibly creating a different (pow2) surface
//
SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx, SkBudgeted::kYes,
surfaceInfo));
if (!surface.get()) {
return nullptr;
}
SkMatrix matrix = fMatrix;
if (subset) {
matrix.postTranslate(-subset->x(), -subset->y());
}
surface->getCanvas()->clear(0); // does NewRenderTarget promise to do this for us?
surface->getCanvas()->drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
sk_sp<SkImage> image(surface->makeImageSnapshot());
if (!image) {
return nullptr;
}
return SkSafeRef(as_IB(image)->peekTexture());
}
#endif
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