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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAlphaThresholdFilter.h"
#include "SkBitmap.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkRegion.h"
class SK_API SkAlphaThresholdFilterImpl : public SkImageFilter {
public:
SkAlphaThresholdFilterImpl(const SkRegion& region, SkScalar innerThreshold, SkScalar outerThreshold);
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAlphaThresholdFilterImpl)
protected:
explicit SkAlphaThresholdFilterImpl(SkReadBuffer& buffer);
virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
#if SK_SUPPORT_GPU
virtual bool asNewEffect(GrEffectRef** effect, GrTexture* texture,
const SkMatrix& matrix, const SkIRect& bounds) const SK_OVERRIDE;
#endif
private:
SkRegion fRegion;
SkScalar fInnerThreshold;
SkScalar fOuterThreshold;
typedef SkImageFilter INHERITED;
};
SkImageFilter* SkAlphaThresholdFilter::Create(const SkRegion& region,
SkScalar innerThreshold,
SkScalar outerThreshold) {
return SkNEW_ARGS(SkAlphaThresholdFilterImpl, (region, innerThreshold, outerThreshold));
}
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrCoordTransform.h"
#include "GrEffect.h"
#include "gl/GrGLEffect.h"
#include "GrTBackendEffectFactory.h"
#include "GrTextureAccess.h"
#include "SkGr.h"
class GrGLAlphaThresholdEffect;
class AlphaThresholdEffect : public GrEffect {
public:
static GrEffectRef* Create(GrTexture* texture,
GrTexture* maskTexture,
float innerThreshold,
float outerThreshold) {
AutoEffectUnref effect(SkNEW_ARGS(AlphaThresholdEffect, (texture,
maskTexture,
innerThreshold,
outerThreshold)));
return CreateEffectRef(effect);
}
virtual ~AlphaThresholdEffect() {};
static const char* Name() { return "Alpha Threshold"; }
virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
float innerThreshold() const { return fInnerThreshold; }
float outerThreshold() const { return fOuterThreshold; }
typedef GrGLAlphaThresholdEffect GLEffect;
private:
AlphaThresholdEffect(GrTexture* texture,
GrTexture* maskTexture,
float innerThreshold,
float outerThreshold)
: fInnerThreshold(innerThreshold)
, fOuterThreshold(outerThreshold)
, fImageCoordTransform(kLocal_GrCoordSet, MakeDivByTextureWHMatrix(texture), texture)
, fImageTextureAccess(texture)
, fMaskCoordTransform(kLocal_GrCoordSet, MakeDivByTextureWHMatrix(maskTexture), maskTexture)
, fMaskTextureAccess(maskTexture) {
this->addCoordTransform(&fImageCoordTransform);
this->addTextureAccess(&fImageTextureAccess);
this->addCoordTransform(&fMaskCoordTransform);
this->addTextureAccess(&fMaskTextureAccess);
}
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
GR_DECLARE_EFFECT_TEST;
float fInnerThreshold;
float fOuterThreshold;
GrCoordTransform fImageCoordTransform;
GrTextureAccess fImageTextureAccess;
GrCoordTransform fMaskCoordTransform;
GrTextureAccess fMaskTextureAccess;
typedef GrEffect INHERITED;
};
class GrGLAlphaThresholdEffect : public GrGLEffect {
public:
GrGLAlphaThresholdEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
virtual void emitCode(GrGLShaderBuilder*,
const GrDrawEffect&,
EffectKey,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray&,
const TextureSamplerArray&) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
private:
GrGLUniformManager::UniformHandle fInnerThresholdVar;
GrGLUniformManager::UniformHandle fOuterThresholdVar;
typedef GrGLEffect INHERITED;
};
GrGLAlphaThresholdEffect::GrGLAlphaThresholdEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
: INHERITED(factory) {
}
void GrGLAlphaThresholdEffect::emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) {
SkString coords2D = builder->ensureFSCoords2D(coords, 0);
SkString maskCoords2D = builder->ensureFSCoords2D(coords, 1);
fInnerThresholdVar = builder->addUniform(
GrGLShaderBuilder::kFragment_Visibility,
kFloat_GrSLType, "inner_threshold");
fOuterThresholdVar = builder->addUniform(
GrGLShaderBuilder::kFragment_Visibility,
kFloat_GrSLType, "outer_threshold");
builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
builder->fsCodeAppendf("\t\tvec2 mask_coord = %s;\n", maskCoords2D.c_str());
builder->fsCodeAppend("\t\tvec4 input_color = ");
builder->fsAppendTextureLookup(samplers[0], "coord");
builder->fsCodeAppend(";\n");
builder->fsCodeAppend("\t\tvec4 mask_color = ");
builder->fsAppendTextureLookup(samplers[1], "mask_coord");
builder->fsCodeAppend(";\n");
builder->fsCodeAppendf("\t\tfloat inner_thresh = %s;\n",
builder->getUniformCStr(fInnerThresholdVar));
builder->fsCodeAppendf("\t\tfloat outer_thresh = %s;\n",
builder->getUniformCStr(fOuterThresholdVar));
builder->fsCodeAppend("\t\tfloat mask = mask_color.a;\n");
builder->fsCodeAppend("vec4 color = input_color;\n");
builder->fsCodeAppend("\t\tif (mask < 0.5) {\n"
"\t\t\tif (color.a > outer_thresh) {\n"
"\t\t\t\tfloat scale = outer_thresh / color.a;\n"
"\t\t\t\tcolor.rgb *= scale;\n"
"\t\t\t\tcolor.a = outer_thresh;\n"
"\t\t\t}\n"
"\t\t} else if (color.a < inner_thresh) {\n"
"\t\t\tfloat scale = inner_thresh / max(0.001, color.a);\n"
"\t\t\tcolor.rgb *= scale;\n"
"\t\t\tcolor.a = inner_thresh;\n"
"\t\t}\n");
builder->fsCodeAppendf("%s = %s;\n", outputColor,
(GrGLSLExpr4(inputColor) * GrGLSLExpr4("color")).c_str());
}
void GrGLAlphaThresholdEffect::setData(const GrGLUniformManager& uman,
const GrDrawEffect& drawEffect) {
const AlphaThresholdEffect& alpha_threshold =
drawEffect.castEffect<AlphaThresholdEffect>();
uman.set1f(fInnerThresholdVar, alpha_threshold.innerThreshold());
uman.set1f(fOuterThresholdVar, alpha_threshold.outerThreshold());
}
/////////////////////////////////////////////////////////////////////
GR_DEFINE_EFFECT_TEST(AlphaThresholdEffect);
GrEffectRef* AlphaThresholdEffect::TestCreate(SkRandom* random,
GrContext* context,
const GrDrawTargetCaps&,
GrTexture** textures) {
GrTexture* bmpTex = textures[GrEffectUnitTest::kSkiaPMTextureIdx];
GrTexture* maskTex = textures[GrEffectUnitTest::kAlphaTextureIdx];
float inner_thresh = random->nextUScalar1();
float outer_thresh = random->nextUScalar1();
return AlphaThresholdEffect::Create(bmpTex, maskTex, inner_thresh, outer_thresh);
}
///////////////////////////////////////////////////////////////////////////////
const GrBackendEffectFactory& AlphaThresholdEffect::getFactory() const {
return GrTBackendEffectFactory<AlphaThresholdEffect>::getInstance();
}
bool AlphaThresholdEffect::onIsEqual(const GrEffect& sBase) const {
const AlphaThresholdEffect& s = CastEffect<AlphaThresholdEffect>(sBase);
return (this->texture(0) == s.texture(0) &&
this->fInnerThreshold == s.fInnerThreshold &&
this->fOuterThreshold == s.fOuterThreshold);
}
void AlphaThresholdEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
GrPixelConfigIsOpaque(this->texture(0)->config())) {
*validFlags = kA_GrColorComponentFlag;
} else {
*validFlags = 0;
}
}
#endif
SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(SkReadBuffer& buffer)
: INHERITED(1, buffer) {
fInnerThreshold = buffer.readScalar();
fOuterThreshold = buffer.readScalar();
buffer.readRegion(&fRegion);
}
SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(const SkRegion& region,
SkScalar innerThreshold,
SkScalar outerThreshold)
: INHERITED(0)
, fRegion(region)
, fInnerThreshold(innerThreshold)
, fOuterThreshold(outerThreshold) {
}
#if SK_SUPPORT_GPU
bool SkAlphaThresholdFilterImpl::asNewEffect(GrEffectRef** effect, GrTexture* texture,
const SkMatrix& in_matrix, const SkIRect&) const {
if (effect) {
GrContext* context = texture->getContext();
GrTextureDesc maskDesc;
if (context->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
maskDesc.fConfig = kAlpha_8_GrPixelConfig;
} else {
maskDesc.fConfig = kRGBA_8888_GrPixelConfig;
}
maskDesc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
// Add one pixel of border to ensure that clamp mode will be all zeros
// the outside.
maskDesc.fWidth = texture->width();
maskDesc.fHeight = texture->height();
GrAutoScratchTexture ast(context, maskDesc, GrContext::kApprox_ScratchTexMatch);
GrTexture* maskTexture = ast.texture();
if (NULL == maskTexture) {
return false;
}
{
GrContext::AutoRenderTarget art(context, ast.texture()->asRenderTarget());
GrPaint grPaint;
grPaint.setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff);
SkRegion::Iterator iter(fRegion);
context->clear(NULL, 0x0, true);
SkMatrix old_matrix = context->getMatrix();
context->setMatrix(in_matrix);
while (!iter.done()) {
SkRect rect = SkRect::Make(iter.rect());
context->drawRect(grPaint, rect);
iter.next();
}
context->setMatrix(old_matrix);
}
*effect = AlphaThresholdEffect::Create(texture,
maskTexture,
fInnerThreshold,
fOuterThreshold);
}
return true;
}
#endif
void SkAlphaThresholdFilterImpl::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fInnerThreshold);
buffer.writeScalar(fOuterThreshold);
buffer.writeRegion(fRegion);
}
bool SkAlphaThresholdFilterImpl::onFilterImage(Proxy*, const SkBitmap& src,
const Context& ctx, SkBitmap* dst,
SkIPoint* offset) const {
SkASSERT(src.colorType() == kN32_SkColorType);
if (src.colorType() != kN32_SkColorType) {
return false;
}
SkMatrix localInverse;
if (!ctx.ctm().invert(&localInverse)) {
return false;
}
SkAutoLockPixels alp(src);
SkASSERT(src.getPixels());
if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
return false;
}
dst->setConfig(src.config(), src.width(), src.height());
if (!dst->allocPixels()) {
return false;
}
U8CPU innerThreshold = (U8CPU)(fInnerThreshold * 0xFF);
U8CPU outerThreshold = (U8CPU)(fOuterThreshold * 0xFF);
SkColor* sptr = src.getAddr32(0, 0);
SkColor* dptr = dst->getAddr32(0, 0);
int width = src.width(), height = src.height();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
const SkColor& source = sptr[y * width + x];
SkColor output_color(source);
SkPoint position;
localInverse.mapXY((SkScalar)x, (SkScalar)y, &position);
if (fRegion.contains((int32_t)position.x(), (int32_t)position.y())) {
if (SkColorGetA(source) < innerThreshold) {
U8CPU alpha = SkColorGetA(source);
if (alpha == 0)
alpha = 1;
float scale = (float)innerThreshold / alpha;
output_color = SkColorSetARGB(innerThreshold,
(U8CPU)(SkColorGetR(source) * scale),
(U8CPU)(SkColorGetG(source) * scale),
(U8CPU)(SkColorGetB(source) * scale));
}
} else {
if (SkColorGetA(source) > outerThreshold) {
float scale = (float)outerThreshold / SkColorGetA(source);
output_color = SkColorSetARGB(outerThreshold,
(U8CPU)(SkColorGetR(source) * scale),
(U8CPU)(SkColorGetG(source) * scale),
(U8CPU)(SkColorGetB(source) * scale));
}
}
dptr[y * dst->width() + x] = output_color;
}
}
return true;
}
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