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- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkString.h"
- #include "include/effects/SkHighContrastFilter.h"
- #include "include/private/SkColorData.h"
- #include "src/core/SkArenaAlloc.h"
- #include "src/core/SkEffectPriv.h"
- #include "src/core/SkRasterPipeline.h"
- #include "src/core/SkReadBuffer.h"
- #include "src/core/SkWriteBuffer.h"
- #if SK_SUPPORT_GPU
- #include "include/gpu/GrContext.h"
- #include "src/gpu/GrColorSpaceInfo.h"
- #include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
- #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
- #endif
- using InvertStyle = SkHighContrastConfig::InvertStyle;
- class SkHighContrast_Filter : public SkColorFilter {
- public:
- SkHighContrast_Filter(const SkHighContrastConfig& config) {
- fConfig = config;
- // Clamp contrast to just inside -1 to 1 to avoid division by zero.
- fConfig.fContrast = SkScalarPin(fConfig.fContrast,
- -1.0f + FLT_EPSILON,
- 1.0f - FLT_EPSILON);
- }
- ~SkHighContrast_Filter() override {}
- #if SK_SUPPORT_GPU
- std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(
- GrRecordingContext*, const GrColorSpaceInfo&) const override;
- #endif
- bool onAppendStages(const SkStageRec& rec, bool shaderIsOpaque) const override;
- protected:
- void flatten(SkWriteBuffer&) const override;
- private:
- SK_FLATTENABLE_HOOKS(SkHighContrast_Filter)
- SkHighContrastConfig fConfig;
- friend class SkHighContrastFilter;
- typedef SkColorFilter INHERITED;
- };
- bool SkHighContrast_Filter::onAppendStages(const SkStageRec& rec, bool shaderIsOpaque) const {
- SkRasterPipeline* p = rec.fPipeline;
- SkArenaAlloc* alloc = rec.fAlloc;
- if (!shaderIsOpaque) {
- p->append(SkRasterPipeline::unpremul);
- }
- // Linearize before applying high-contrast filter.
- auto tf = alloc->make<skcms_TransferFunction>();
- if (rec.fDstCS) {
- rec.fDstCS->transferFn(&tf->g);
- } else {
- // Historically we approximate untagged destinations as gamma 2.
- // TODO: sRGB?
- *tf = {2,1, 0,0,0,0,0};
- }
- p->append(SkRasterPipeline::parametric, tf);
- if (fConfig.fGrayscale) {
- float r = SK_LUM_COEFF_R;
- float g = SK_LUM_COEFF_G;
- float b = SK_LUM_COEFF_B;
- float* matrix = alloc->makeArray<float>(12);
- matrix[0] = matrix[1] = matrix[2] = r;
- matrix[3] = matrix[4] = matrix[5] = g;
- matrix[6] = matrix[7] = matrix[8] = b;
- p->append(SkRasterPipeline::matrix_3x4, matrix);
- }
- if (fConfig.fInvertStyle == InvertStyle::kInvertBrightness) {
- float* matrix = alloc->makeArray<float>(12);
- matrix[0] = matrix[4] = matrix[8] = -1;
- matrix[9] = matrix[10] = matrix[11] = 1;
- p->append(SkRasterPipeline::matrix_3x4, matrix);
- } else if (fConfig.fInvertStyle == InvertStyle::kInvertLightness) {
- p->append(SkRasterPipeline::rgb_to_hsl);
- float* matrix = alloc->makeArray<float>(12);
- matrix[0] = matrix[4] = matrix[11] = 1;
- matrix[8] = -1;
- p->append(SkRasterPipeline::matrix_3x4, matrix);
- p->append(SkRasterPipeline::hsl_to_rgb);
- }
- if (fConfig.fContrast != 0.0) {
- float* matrix = alloc->makeArray<float>(12);
- float c = fConfig.fContrast;
- float m = (1 + c) / (1 - c);
- float b = (-0.5f * m + 0.5f);
- matrix[0] = matrix[4] = matrix[8] = m;
- matrix[9] = matrix[10] = matrix[11] = b;
- p->append(SkRasterPipeline::matrix_3x4, matrix);
- }
- p->append(SkRasterPipeline::clamp_0);
- p->append(SkRasterPipeline::clamp_1);
- // Re-encode back from linear.
- auto invTF = alloc->make<skcms_TransferFunction>();
- if (rec.fDstCS) {
- rec.fDstCS->invTransferFn(&invTF->g);
- } else {
- // See above... historically untagged == gamma 2 in this filter.
- *invTF ={0.5f,1, 0,0,0,0,0};
- }
- p->append(SkRasterPipeline::parametric, invTF);
- if (!shaderIsOpaque) {
- p->append(SkRasterPipeline::premul);
- }
- return true;
- }
- void SkHighContrast_Filter::flatten(SkWriteBuffer& buffer) const {
- buffer.writeBool(fConfig.fGrayscale);
- buffer.writeInt(static_cast<int>(fConfig.fInvertStyle));
- buffer.writeScalar(fConfig.fContrast);
- }
- sk_sp<SkFlattenable> SkHighContrast_Filter::CreateProc(SkReadBuffer& buffer) {
- SkHighContrastConfig config;
- config.fGrayscale = buffer.readBool();
- config.fInvertStyle = buffer.read32LE(InvertStyle::kLast);
- config.fContrast = buffer.readScalar();
- return SkHighContrastFilter::Make(config);
- }
- sk_sp<SkColorFilter> SkHighContrastFilter::Make(
- const SkHighContrastConfig& config) {
- if (!config.isValid()) {
- return nullptr;
- }
- return sk_make_sp<SkHighContrast_Filter>(config);
- }
- void SkHighContrastFilter::RegisterFlattenables() {
- SK_REGISTER_FLATTENABLE(SkHighContrast_Filter);
- }
- #if SK_SUPPORT_GPU
- class HighContrastFilterEffect : public GrFragmentProcessor {
- public:
- static std::unique_ptr<GrFragmentProcessor> Make(const SkHighContrastConfig& config,
- bool linearize) {
- return std::unique_ptr<GrFragmentProcessor>(new HighContrastFilterEffect(config,
- linearize));
- }
- const char* name() const override { return "HighContrastFilter"; }
- const SkHighContrastConfig& config() const { return fConfig; }
- bool linearize() const { return fLinearize; }
- std::unique_ptr<GrFragmentProcessor> clone() const override {
- return Make(fConfig, fLinearize);
- }
- private:
- HighContrastFilterEffect(const SkHighContrastConfig& config, bool linearize)
- : INHERITED(kHighContrastFilterEffect_ClassID, kNone_OptimizationFlags)
- , fConfig(config)
- , fLinearize(linearize) {}
- GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
- virtual void onGetGLSLProcessorKey(const GrShaderCaps& caps,
- GrProcessorKeyBuilder* b) const override;
- bool onIsEqual(const GrFragmentProcessor& other) const override {
- const HighContrastFilterEffect& that = other.cast<HighContrastFilterEffect>();
- return fConfig.fGrayscale == that.fConfig.fGrayscale &&
- fConfig.fInvertStyle == that.fConfig.fInvertStyle &&
- fConfig.fContrast == that.fConfig.fContrast &&
- fLinearize == that.fLinearize;
- }
- SkHighContrastConfig fConfig;
- bool fLinearize;
- typedef GrFragmentProcessor INHERITED;
- };
- class GLHighContrastFilterEffect : public GrGLSLFragmentProcessor {
- public:
- static void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);
- protected:
- void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
- void emitCode(EmitArgs& args) override;
- private:
- UniformHandle fContrastUni;
- typedef GrGLSLFragmentProcessor INHERITED;
- };
- GrGLSLFragmentProcessor* HighContrastFilterEffect::onCreateGLSLInstance() const {
- return new GLHighContrastFilterEffect();
- }
- void HighContrastFilterEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
- GrProcessorKeyBuilder* b) const {
- GLHighContrastFilterEffect::GenKey(*this, caps, b);
- }
- void GLHighContrastFilterEffect::onSetData(const GrGLSLProgramDataManager& pdm,
- const GrFragmentProcessor& proc) {
- const HighContrastFilterEffect& hcfe = proc.cast<HighContrastFilterEffect>();
- pdm.set1f(fContrastUni, hcfe.config().fContrast);
- }
- void GLHighContrastFilterEffect::GenKey(
- const GrProcessor& proc, const GrShaderCaps&, GrProcessorKeyBuilder* b) {
- const HighContrastFilterEffect& hcfe = proc.cast<HighContrastFilterEffect>();
- b->add32(static_cast<uint32_t>(hcfe.config().fGrayscale));
- b->add32(static_cast<uint32_t>(hcfe.config().fInvertStyle));
- b->add32(hcfe.linearize() ? 1 : 0);
- }
- void GLHighContrastFilterEffect::emitCode(EmitArgs& args) {
- const HighContrastFilterEffect& hcfe = args.fFp.cast<HighContrastFilterEffect>();
- const SkHighContrastConfig& config = hcfe.config();
- const char* contrast;
- fContrastUni = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType,
- "contrast", &contrast);
- GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
- fragBuilder->codeAppendf("half4 color = %s;", args.fInputColor);
- // Unpremultiply. The max() is to guard against 0 / 0.
- fragBuilder->codeAppendf("half nonZeroAlpha = max(color.a, 0.0001);");
- fragBuilder->codeAppendf("color = half4(color.rgb / nonZeroAlpha, nonZeroAlpha);");
- if (hcfe.linearize()) {
- fragBuilder->codeAppend("color.rgb = color.rgb * color.rgb;");
- }
- // Grayscale.
- if (config.fGrayscale) {
- fragBuilder->codeAppendf("half luma = dot(color, half4(%f, %f, %f, 0));",
- SK_LUM_COEFF_R, SK_LUM_COEFF_G, SK_LUM_COEFF_B);
- fragBuilder->codeAppendf("color = half4(luma, luma, luma, 0);");
- }
- if (config.fInvertStyle == InvertStyle::kInvertBrightness) {
- fragBuilder->codeAppendf("color = half4(1, 1, 1, 1) - color;");
- }
- if (config.fInvertStyle == InvertStyle::kInvertLightness) {
- // Convert from RGB to HSL.
- fragBuilder->codeAppendf("half fmax = max(color.r, max(color.g, color.b));");
- fragBuilder->codeAppendf("half fmin = min(color.r, min(color.g, color.b));");
- fragBuilder->codeAppendf("half l = (fmax + fmin) / 2;");
- fragBuilder->codeAppendf("half h;");
- fragBuilder->codeAppendf("half s;");
- fragBuilder->codeAppendf("if (fmax == fmin) {");
- fragBuilder->codeAppendf(" h = 0;");
- fragBuilder->codeAppendf(" s = 0;");
- fragBuilder->codeAppendf("} else {");
- fragBuilder->codeAppendf(" half d = fmax - fmin;");
- fragBuilder->codeAppendf(" s = l > 0.5 ?");
- fragBuilder->codeAppendf(" d / (2 - fmax - fmin) :");
- fragBuilder->codeAppendf(" d / (fmax + fmin);");
- // We'd like to just write "if (color.r == fmax) { ... }". On many GPUs, running the
- // angle_d3d9_es2 config, that failed. It seems that max(x, y) is not necessarily equal
- // to either x or y. Tried several ways to fix it, but this was the only reasonable fix.
- fragBuilder->codeAppendf(" if (color.r >= color.g && color.r >= color.b) {");
- fragBuilder->codeAppendf(" h = (color.g - color.b) / d + ");
- fragBuilder->codeAppendf(" (color.g < color.b ? 6 : 0);");
- fragBuilder->codeAppendf(" } else if (color.g >= color.b) {");
- fragBuilder->codeAppendf(" h = (color.b - color.r) / d + 2;");
- fragBuilder->codeAppendf(" } else {");
- fragBuilder->codeAppendf(" h = (color.r - color.g) / d + 4;");
- fragBuilder->codeAppendf(" }");
- fragBuilder->codeAppendf("}");
- fragBuilder->codeAppendf("h /= 6;");
- fragBuilder->codeAppendf("l = 1.0 - l;");
- // Convert back from HSL to RGB.
- SkString hue2rgbFuncName;
- const GrShaderVar gHue2rgbArgs[] = {
- GrShaderVar("p", kHalf_GrSLType),
- GrShaderVar("q", kHalf_GrSLType),
- GrShaderVar("t", kHalf_GrSLType),
- };
- fragBuilder->emitFunction(kHalf_GrSLType,
- "hue2rgb",
- SK_ARRAY_COUNT(gHue2rgbArgs),
- gHue2rgbArgs,
- "if (t < 0)"
- " t += 1;"
- "if (t > 1)"
- " t -= 1;"
- "if (t < 1/6.)"
- " return p + (q - p) * 6 * t;"
- "if (t < 1/2.)"
- " return q;"
- "if (t < 2/3.)"
- " return p + (q - p) * (2/3. - t) * 6;"
- "return p;",
- &hue2rgbFuncName);
- fragBuilder->codeAppendf("if (s == 0) {");
- fragBuilder->codeAppendf(" color = half4(l, l, l, 0);");
- fragBuilder->codeAppendf("} else {");
- fragBuilder->codeAppendf(" half q = l < 0.5 ? l * (1 + s) : l + s - l * s;");
- fragBuilder->codeAppendf(" half p = 2 * l - q;");
- fragBuilder->codeAppendf(" color.r = %s(p, q, h + 1/3.);", hue2rgbFuncName.c_str());
- fragBuilder->codeAppendf(" color.g = %s(p, q, h);", hue2rgbFuncName.c_str());
- fragBuilder->codeAppendf(" color.b = %s(p, q, h - 1/3.);", hue2rgbFuncName.c_str());
- fragBuilder->codeAppendf("}");
- }
- // Contrast.
- fragBuilder->codeAppendf("if (%s != 0) {", contrast);
- fragBuilder->codeAppendf(" half m = (1 + %s) / (1 - %s);", contrast, contrast);
- fragBuilder->codeAppendf(" half off = (-0.5 * m + 0.5);");
- fragBuilder->codeAppendf(" color = m * color + off;");
- fragBuilder->codeAppendf("}");
- // Clamp.
- fragBuilder->codeAppendf("color = saturate(color);");
- if (hcfe.linearize()) {
- fragBuilder->codeAppend("color.rgb = sqrt(color.rgb);");
- }
- // Restore the original alpha and premultiply.
- fragBuilder->codeAppendf("color.a = %s.a;", args.fInputColor);
- fragBuilder->codeAppendf("color.rgb *= color.a;");
- // Copy to the output color.
- fragBuilder->codeAppendf("%s = color;", args.fOutputColor);
- }
- std::unique_ptr<GrFragmentProcessor> SkHighContrast_Filter::asFragmentProcessor(
- GrRecordingContext*, const GrColorSpaceInfo& csi) const {
- bool linearize = !csi.isLinearlyBlended();
- return HighContrastFilterEffect::Make(fConfig, linearize);
- }
- #endif
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