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/*
* Copyright 2013 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkXfermodeImageFilter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#include "SkXfermode.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "effects/GrSimpleTextureEffect.h"
#include "SkGr.h"
#include "SkImageFilterUtils.h"
#endif
///////////////////////////////////////////////////////////////////////////////
SkXfermodeImageFilter::SkXfermodeImageFilter(SkXfermode* mode,
SkImageFilter* background,
SkImageFilter* foreground)
: INHERITED(background, foreground), fMode(mode) {
SkSafeRef(fMode);
}
SkXfermodeImageFilter::~SkXfermodeImageFilter() {
SkSafeUnref(fMode);
}
SkXfermodeImageFilter::SkXfermodeImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fMode = buffer.readFlattenableT<SkXfermode>();
}
void SkXfermodeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fMode);
}
bool SkXfermodeImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* dst,
SkIPoint* offset) {
SkBitmap background = src, foreground = src;
SkImageFilter* backgroundInput = getInput(0);
SkImageFilter* foregroundInput = getInput(1);
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (backgroundInput &&
!backgroundInput->filterImage(proxy, src, ctm, &background, &backgroundOffset)) {
return false;
}
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (foregroundInput &&
!foregroundInput->filterImage(proxy, src, ctm, &foreground, &foregroundOffset)) {
return false;
}
dst->setConfig(background.config(), background.width(), background.height());
dst->allocPixels();
SkCanvas canvas(*dst);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawBitmap(background, 0, 0, &paint);
paint.setXfermode(fMode);
canvas.drawBitmap(foreground,
SkIntToScalar(foregroundOffset.fX - backgroundOffset.fX),
SkIntToScalar(foregroundOffset.fY - backgroundOffset.fY),
&paint);
offset->fX += backgroundOffset.fX;
offset->fY += backgroundOffset.fY;
return true;
}
#if SK_SUPPORT_GPU
bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* result,
SkIPoint* offset) {
SkBitmap background;
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &background,
&backgroundOffset)) {
return false;
}
GrTexture* backgroundTex = background.getTexture();
SkBitmap foreground;
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!SkImageFilterUtils::GetInputResultGPU(getInput(1), proxy, src, ctm, &foreground,
&foregroundOffset)) {
return false;
}
GrTexture* foregroundTex = foreground.getTexture();
GrContext* context = foregroundTex->getContext();
GrEffectRef* xferEffect = NULL;
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fWidth = src.width();
desc.fHeight = src.height();
desc.fConfig = kSkia8888_GrPixelConfig;
GrAutoScratchTexture ast(context, desc);
SkAutoTUnref<GrTexture> dst(ast.detach());
GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
SkXfermode::Coeff sm, dm;
if (!SkXfermode::AsNewEffectOrCoeff(fMode, context, &xferEffect, &sm, &dm, backgroundTex)) {
return false;
}
SkMatrix foregroundMatrix = GrEffect::MakeDivByTextureWHMatrix(foregroundTex);
foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));
SkRect srcRect;
src.getBounds(&srcRect);
if (NULL != xferEffect) {
GrPaint paint;
paint.addColorTextureEffect(foregroundTex, foregroundMatrix);
paint.addColorEffect(xferEffect)->unref();
context->drawRect(paint, srcRect);
} else {
GrPaint backgroundPaint;
SkMatrix backgroundMatrix = GrEffect::MakeDivByTextureWHMatrix(backgroundTex);
backgroundPaint.addColorTextureEffect(backgroundTex, backgroundMatrix);
context->drawRect(backgroundPaint, srcRect);
GrPaint foregroundPaint;
foregroundPaint.setBlendFunc(sk_blend_to_grblend(sm), sk_blend_to_grblend(dm));
foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
context->drawRect(foregroundPaint, srcRect);
}
offset->fX += backgroundOffset.fX;
offset->fY += backgroundOffset.fY;
return SkImageFilterUtils::WrapTexture(dst, src.width(), src.height(), result);
}
#endif
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