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/*
* Copyright 2012 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 "SkBlendImageFilter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#if SK_SUPPORT_GPU
#include "SkGr.h"
#include "SkGrPixelRef.h"
#include "gl/GrGLProgramStage.h"
#endif
namespace {
SkXfermode::Mode modeToXfermode(SkBlendImageFilter::Mode mode)
{
switch (mode) {
case SkBlendImageFilter::kNormal_Mode:
return SkXfermode::kSrcOver_Mode;
case SkBlendImageFilter::kMultiply_Mode:
return SkXfermode::kMultiply_Mode;
case SkBlendImageFilter::kScreen_Mode:
return SkXfermode::kScreen_Mode;
case SkBlendImageFilter::kDarken_Mode:
return SkXfermode::kDarken_Mode;
case SkBlendImageFilter::kLighten_Mode:
return SkXfermode::kLighten_Mode;
}
SkASSERT(0);
return SkXfermode::kSrcOver_Mode;
}
SkPMColor multiply_proc(SkPMColor src, SkPMColor dst) {
int omsa = 255 - SkGetPackedA32(src);
int sr = SkGetPackedR32(src), sg = SkGetPackedG32(src), sb = SkGetPackedB32(src);
int omda = 255 - SkGetPackedA32(dst);
int dr = SkGetPackedR32(dst), dg = SkGetPackedG32(dst), db = SkGetPackedB32(dst);
int a = 255 - SkMulDiv255Round(omsa, omda);
int r = SkMulDiv255Round(omsa, dr) + SkMulDiv255Round(omda, sr) + SkMulDiv255Round(sr, dr);
int g = SkMulDiv255Round(omsa, dg) + SkMulDiv255Round(omda, sg) + SkMulDiv255Round(sg, dg);
int b = SkMulDiv255Round(omsa, db) + SkMulDiv255Round(omda, sb) + SkMulDiv255Round(sb, db);
return SkPackARGB32(a, r, g, b);
}
};
///////////////////////////////////////////////////////////////////////////////
SkBlendImageFilter::SkBlendImageFilter(SkBlendImageFilter::Mode mode, SkImageFilter* background, SkImageFilter* foreground)
: fMode(mode)
{
fBackground = background;
SkASSERT(background != NULL);
SkSafeRef(fBackground);
fForeground = foreground;
SkSafeRef(fForeground);
}
SkBlendImageFilter::~SkBlendImageFilter() {
SkSafeUnref(fBackground);
SkSafeUnref(fForeground);
}
SkBlendImageFilter::SkBlendImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer)
{
fMode = (SkBlendImageFilter::Mode) buffer.readInt();
fBackground = buffer.readFlattenableT<SkImageFilter>();
if (buffer.readBool()) {
fForeground = buffer.readFlattenableT<SkImageFilter>();
} else {
fForeground = NULL;
}
}
void SkBlendImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeInt((int) fMode);
buffer.writeFlattenable(fBackground);
buffer.writeBool(NULL != fForeground);
if (NULL != fForeground) {
buffer.writeFlattenable(fForeground);
}
}
bool SkBlendImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* dst,
SkIPoint* offset) {
SkBitmap background, foreground = src;
SkASSERT(fBackground);
if (!fBackground->filterImage(proxy, src, ctm, &background, offset)) {
return false;
}
if (fForeground && !fForeground->filterImage(proxy, src, ctm, &foreground, offset)) {
return false;
}
SkAutoLockPixels alp_foreground(foreground), alp_background(background);
if (!foreground.getPixels() || !background.getPixels()) {
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);
// FEBlend's multiply mode is (1 - Sa) * Da + (1 - Da) * Sc + Sc * Dc
// Skia's is just Sc * Dc. So we use a custom proc to implement FEBlend's
// version.
if (fMode == SkBlendImageFilter::kMultiply_Mode) {
paint.setXfermode(new SkProcXfermode(multiply_proc))->unref();
} else {
paint.setXfermodeMode(modeToXfermode(fMode));
}
canvas.drawBitmap(foreground, 0, 0, &paint);
return true;
}
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
class GrGLBlendEffect : public GrGLProgramStage {
public:
GrGLBlendEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual ~GrGLBlendEffect();
virtual void emitFS(GrGLShaderBuilder* builder,
const char* outputColor,
const char* inputColor,
const char* samplerName) SK_OVERRIDE;
virtual void emitVS(GrGLShaderBuilder* builder,
const char* vertexCoords) SK_OVERRIDE {}
static inline StageKey GenKey(const GrCustomStage& s, const GrGLCaps&);
private:
typedef GrGLProgramStage INHERITED;
SkBlendImageFilter::Mode fMode;
};
///////////////////////////////////////////////////////////////////////////////
class GrBlendEffect : public GrSingleTextureEffect {
public:
GrBlendEffect(SkBlendImageFilter::Mode mode, GrTexture* foreground);
virtual ~GrBlendEffect();
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
const GrProgramStageFactory& getFactory() const;
SkBlendImageFilter::Mode mode() const { return fMode; }
typedef GrGLBlendEffect GLProgramStage;
static const char* Name() { return "Blend"; }
private:
typedef GrSingleTextureEffect INHERITED;
SkBlendImageFilter::Mode fMode;
};
// FIXME: This should be refactored with SkSingleInputImageFilter's version.
static GrTexture* getInputResultAsTexture(SkImageFilter* input,
GrTexture* src,
const SkRect& rect) {
GrTexture* resultTex;
if (!input) {
resultTex = src;
} else if (input->canFilterImageGPU()) {
// onFilterImageGPU() already refs the result, so just return it here.
return input->onFilterImageGPU(src, rect);
} else {
SkBitmap srcBitmap, result;
srcBitmap.setConfig(SkBitmap::kARGB_8888_Config, src->width(), src->height());
srcBitmap.setPixelRef(new SkGrPixelRef(src))->unref();
SkIPoint offset;
if (input->filterImage(NULL, srcBitmap, SkMatrix(), &result, &offset)) {
if (result.getTexture()) {
resultTex = (GrTexture*) result.getTexture();
} else {
resultTex = GrLockCachedBitmapTexture(src->getContext(), result, NULL);
SkSafeRef(resultTex);
GrUnlockCachedBitmapTexture(resultTex);
return resultTex;
}
} else {
resultTex = src;
}
}
SkSafeRef(resultTex);
return resultTex;
}
GrTexture* SkBlendImageFilter::onFilterImageGPU(GrTexture* src, const SkRect& rect) {
SkAutoTUnref<GrTexture> background(getInputResultAsTexture(fBackground, src, rect));
SkAutoTUnref<GrTexture> foreground(getInputResultAsTexture(fForeground, src, rect));
GrContext* context = src->getContext();
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fWidth = SkScalarCeilToInt(rect.width());
desc.fHeight = SkScalarCeilToInt(rect.height());
desc.fConfig = kRGBA_8888_GrPixelConfig;
GrAutoScratchTexture ast(context, desc);
GrTexture* dst = ast.detach();
GrContext::AutoMatrix avm(context, GrMatrix::I());
GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
GrContext::AutoClip ac(context, rect);
GrMatrix sampleM;
sampleM.setIDiv(background->width(), background->height());
GrPaint paint;
paint.reset();
paint.textureSampler(0)->reset(sampleM);
paint.textureSampler(0)->setCustomStage(SkNEW_ARGS(GrSingleTextureEffect, (background.get())))->unref();
paint.textureSampler(1)->reset(sampleM);
paint.textureSampler(1)->setCustomStage(SkNEW_ARGS(GrBlendEffect, (fMode, foreground.get())))->unref();
context->drawRect(paint, rect);
return dst;
}
///////////////////////////////////////////////////////////////////////////////
GrBlendEffect::GrBlendEffect(SkBlendImageFilter::Mode mode, GrTexture* foreground)
: INHERITED(foreground), fMode(mode) {
}
GrBlendEffect::~GrBlendEffect() {
}
bool GrBlendEffect::isEqual(const GrCustomStage& sBase) const {
const GrBlendEffect& s = static_cast<const GrBlendEffect&>(sBase);
return INHERITED::isEqual(sBase) &&
fMode == s.fMode;
}
const GrProgramStageFactory& GrBlendEffect::getFactory() const {
return GrTProgramStageFactory<GrBlendEffect>::getInstance();
}
///////////////////////////////////////////////////////////////////////////////
GrGLBlendEffect::GrGLBlendEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage)
: GrGLProgramStage(factory),
fMode(static_cast<const GrBlendEffect&>(stage).mode()) {
}
GrGLBlendEffect::~GrGLBlendEffect() {
}
void GrGLBlendEffect::emitFS(GrGLShaderBuilder* builder,
const char* outputColor,
const char* inputColor,
const char* samplerName) {
SkString* code = &builder->fFSCode;
const char* bgColor = inputColor;
const char* fgColor = "fgColor";
code->appendf("\t\tvec4 %s = ", fgColor);
builder->emitTextureLookup(samplerName);
code->appendf(";\n");
code->appendf("\t\t%s.a = 1.0 - (1.0 - %s.a) * (1.0 - %s.b);\n", outputColor, bgColor, fgColor);
switch (fMode) {
case SkBlendImageFilter::kNormal_Mode:
code->appendf("\t\t%s.rgb = (1.0 - %s.a) * %s.rgb + %s.rgb;\n", outputColor, fgColor, bgColor, fgColor);
break;
case SkBlendImageFilter::kMultiply_Mode:
code->appendf("\t\t%s.rgb = (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb + %s.rgb * %s.rgb;\n", outputColor, fgColor, bgColor, bgColor, fgColor, fgColor, bgColor);
break;
case SkBlendImageFilter::kScreen_Mode:
code->appendf("\t\t%s.rgb = %s.rgb + %s.rgb - %s.rgb * %s.rgb;\n", outputColor, bgColor, fgColor, fgColor, bgColor);
break;
case SkBlendImageFilter::kDarken_Mode:
code->appendf("\t\t%s.rgb = min((1.0 - %s.a) * %s.rgb + %s.rgb, (1.0 - %s.a) * %s.rgb + %s.rgb);\n", outputColor, fgColor, bgColor, fgColor, bgColor, fgColor, bgColor);
break;
case SkBlendImageFilter::kLighten_Mode:
code->appendf("\t\t%s.rgb = max((1.0 - %s.a) * %s.rgb + %s.rgb, (1.0 - %s.a) * %s.rgb + %s.rgb);\n", outputColor, fgColor, bgColor, fgColor, bgColor, fgColor, bgColor);
break;
}
}
GrGLProgramStage::StageKey GrGLBlendEffect::GenKey(const GrCustomStage& s, const GrGLCaps&) {
return static_cast<const GrBlendEffect&>(s).mode();
}
#endif
SK_DEFINE_FLATTENABLE_REGISTRAR(SkBlendImageFilter)
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