GrPorterDuffXferProcessor.cpp File Reference

#include "src/gpu/ganesh/effects/GrPorterDuffXferProcessor.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkColor.h"
#include "include/private/SkColorData.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkFloatingPoint.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "src/base/SkRandom.h"
#include "src/core/SkSLTypeShared.h"
#include "src/gpu/Blend.h"
#include "src/gpu/BlendFormula.h"
#include "src/gpu/KeyBuilder.h"
#include "src/gpu/ganesh/GrCaps.h"
#include "src/gpu/ganesh/GrProcessorAnalysis.h"
#include "src/gpu/ganesh/GrShaderCaps.h"
#include "src/gpu/ganesh/GrXferProcessor.h"
#include "src/gpu/ganesh/glsl/GrGLSLBlend.h"
#include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/ganesh/glsl/GrGLSLProgramDataManager.h"
#include "src/gpu/ganesh/glsl/GrGLSLUniformHandler.h"
#include <cstring>
#include <memory>
#include <string>

Go to the source code of this file.

Classes
class	PorterDuffXferProcessor
class	ShaderPDXferProcessor
class	PDLCDXferProcessor

Functions
static void	append_color_output (const PorterDuffXferProcessor &xp, GrGLSLXPFragmentBuilder *fragBuilder, BlendFormula::OutputType outputType, const char *output, const char *inColor, const char *inCoverage)
static GrXPFactory::AnalysisProperties	analysis_properties (const GrProcessorAnalysisColor &color, const GrProcessorAnalysisCoverage &coverage, const GrCaps &caps, GrClampType clampType, SkBlendMode mode)

Function Documentation

analysis_properties()

static GrXPFactory::AnalysisProperties analysis_properties ( const GrProcessorAnalysisColor &  color, const GrProcessorAnalysisCoverage &  coverage, const GrCaps &  caps, GrClampType  clampType, SkBlendMode  mode  )

inlinestatic

color.isOpaque() ||

Definition at line 401 of file GrPorterDuffXferProcessor.cpp.

                                                                     {
    using AnalysisProperties = GrXPFactory::AnalysisProperties;
    AnalysisProperties props = AnalysisProperties::kNone;
    bool hasCoverage = GrProcessorAnalysisCoverage::kNone != coverage;
    bool isLCD = GrProcessorAnalysisCoverage::kLCD == coverage;
    BlendFormula formula = [&](){
        if (isLCD) {
            return skgpu::GetLCDBlendFormula(mode);
        }
        return skgpu::GetBlendFormula(color.isOpaque(), hasCoverage, mode);
    }();
 
    if (formula.canTweakAlphaForCoverage() && !isLCD) {
        props |= AnalysisProperties::kCompatibleWithCoverageAsAlpha;
    }
 
    if (isLCD) {
        // See comment in MakeSrcOverXferProcessor about color.isOpaque here
        if (SkBlendMode::kSrcOver == mode && color.isConstant() && /*color.isOpaque() &&*/
            !caps.shaderCaps()->fDualSourceBlendingSupport &&
            !caps.shaderCaps()->fDstReadInShaderSupport) {
            props |= AnalysisProperties::kIgnoresInputColor;
        } else {
            // For LCD blending, if the color is not opaque we must read the dst in shader even if
            // we have dual source blending. The opaqueness check must be done after blending so for
            // simplicity we only allow src-over to not take the dst read path (though src, src-in,
            // and DstATop would also work). We also fall into the dst read case for src-over if we
            // do not have dual source blending.
            if (SkBlendMode::kSrcOver != mode ||
                /*!color.isOpaque() ||*/ // See comment in MakeSrcOverXferProcessor about isOpaque.
                (formula.hasSecondaryOutput() && !caps.shaderCaps()->fDualSourceBlendingSupport)) {
                props |= AnalysisProperties::kReadsDstInShader;
            }
        }
    } else {
        // With dual-source blending we never need the destination color in the shader.
        if (!caps.shaderCaps()->fDualSourceBlendingSupport) {
            if (formula.hasSecondaryOutput()) {
                props |= AnalysisProperties::kReadsDstInShader;
            }
        }
    }
 
    if (GrClampType::kAuto != clampType && SkBlendMode::kPlus == mode) {
        props |= AnalysisProperties::kReadsDstInShader;
    }
 
    if (!formula.modifiesDst() || !formula.usesInputColor()) {
        props |= AnalysisProperties::kIgnoresInputColor;
    }
    if (formula.unaffectedByDst() || (formula.unaffectedByDstIfOpaque() && color.isOpaque() &&
                                      !hasCoverage)) {
        props |= AnalysisProperties::kUnaffectedByDstValue;
    }
    return props;
}

append_color_output()

static void append_color_output ( const PorterDuffXferProcessor &  xp, GrGLSLXPFragmentBuilder *  fragBuilder, BlendFormula::OutputType  outputType, const char *  output, const char *  inColor, const char *  inCoverage  )

static

Definition at line 73 of file GrPorterDuffXferProcessor.cpp.

                                                                             {
    SkASSERT(inCoverage);
    SkASSERT(inColor);
    switch (outputType) {
        case BlendFormula::kNone_OutputType:
            fragBuilder->codeAppendf("%s = half4(0.0);", output);
            break;
        case BlendFormula::kCoverage_OutputType:
            fragBuilder->codeAppendf("%s = %s;", output, inCoverage);
            break;
        case BlendFormula::kModulate_OutputType:
            fragBuilder->codeAppendf("%s = %s * %s;", output, inColor, inCoverage);
            break;
        case BlendFormula::kSAModulate_OutputType:
            fragBuilder->codeAppendf("%s = %s.a * %s;", output, inColor, inCoverage);
            break;
        case BlendFormula::kISAModulate_OutputType:
            fragBuilder->codeAppendf("%s = (1.0 - %s.a) * %s;", output, inColor, inCoverage);
            break;
        case BlendFormula::kISCModulate_OutputType:
            fragBuilder->codeAppendf("%s = (half4(1.0) - %s) * %s;", output, inColor, inCoverage);
            break;
        default:
            SK_ABORT("Unsupported output type.");
            break;
    }
}