The Tor Browser: gfx/skia/trunk/src/effects/SkArithmeticMode.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/effects/SkArithmeticMode.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/effects/SkArithmeticMode.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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 "SkArithmeticMode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkString.h"
 #include "SkUnPreMultiply.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrCoordTransform.h"
 #include "gl/GrGLEffect.h"
 #include "GrTBackendEffectFactory.h"
 #endif
 static const bool gUseUnpremul = false;
 class SkArithmeticMode_scalar : public SkXfermode {
 public:
     static SkArithmeticMode_scalar* Create(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4) {
         return SkNEW_ARGS(SkArithmeticMode_scalar, (k1, k2, k3, k4));
     }
     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
                         const SkAlpha aa[]) const SK_OVERRIDE;
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkArithmeticMode_scalar)
 #if SK_SUPPORT_GPU
     virtual bool asNewEffect(GrEffectRef** effect, GrTexture* background) const SK_OVERRIDE;
 #endif
 private:
     SkArithmeticMode_scalar(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4) {
         fK[0] = k1;
         fK[1] = k2;
         fK[2] = k3;
         fK[3] = k4;
     }
     SkArithmeticMode_scalar(SkReadBuffer& buffer) : INHERITED(buffer) {
         fK[0] = buffer.readScalar();
         fK[1] = buffer.readScalar();
         fK[2] = buffer.readScalar();
         fK[3] = buffer.readScalar();
     }
     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         INHERITED::flatten(buffer);
         buffer.writeScalar(fK[0]);
         buffer.writeScalar(fK[1]);
         buffer.writeScalar(fK[2]);
         buffer.writeScalar(fK[3]);
     }
     SkScalar fK[4];
     typedef SkXfermode INHERITED;
 };
 static int pinToByte(int value) {
     if (value < 0) {
         value = 0;
     } else if (value > 255) {
         value = 255;
     }
     return value;
 }
 static int arith(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4,
                  int src, int dst) {
     SkScalar result = SkScalarMul(k1, src * dst) +
                       SkScalarMul(k2, src) +
                       SkScalarMul(k3, dst) +
                       k4;
     int res = SkScalarRoundToInt(result);
     return pinToByte(res);
 }
 static int blend(int src, int dst, int scale) {
     return dst + ((src - dst) * scale >> 8);
 }
 static bool needsUnpremul(int alpha) {
     return 0 != alpha && 0xFF != alpha;
 }
 void SkArithmeticMode_scalar::xfer32(SkPMColor dst[], const SkPMColor src[],
                                  int count, const SkAlpha aaCoverage[]) const {
     SkScalar k1 = fK[0] / 255;
     SkScalar k2 = fK[1];
     SkScalar k3 = fK[2];
     SkScalar k4 = fK[3] * 255;
     for (int i = 0; i < count; ++i) {
         if ((NULL == aaCoverage) || aaCoverage[i]) {
             SkPMColor sc = src[i];
             SkPMColor dc = dst[i];
             int a, r, g, b;
             if (gUseUnpremul) {
                 int sa = SkGetPackedA32(sc);
                 int da = SkGetPackedA32(dc);
                 int srcNeedsUnpremul = needsUnpremul(sa);
                 int dstNeedsUnpremul = needsUnpremul(da);
                 if (!srcNeedsUnpremul && !dstNeedsUnpremul) {
                     a = arith(k1, k2, k3, k4, sa, da);
                     r = arith(k1, k2, k3, k4, SkGetPackedR32(sc), SkGetPackedR32(dc));
                     g = arith(k1, k2, k3, k4, SkGetPackedG32(sc), SkGetPackedG32(dc));
                     b = arith(k1, k2, k3, k4, SkGetPackedB32(sc), SkGetPackedB32(dc));
                 } else {
                     int sr = SkGetPackedR32(sc);
                     int sg = SkGetPackedG32(sc);
                     int sb = SkGetPackedB32(sc);
                     if (srcNeedsUnpremul) {
                         SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(sa);
                         sr = SkUnPreMultiply::ApplyScale(scale, sr);
                         sg = SkUnPreMultiply::ApplyScale(scale, sg);
                         sb = SkUnPreMultiply::ApplyScale(scale, sb);
                     }
                     int dr = SkGetPackedR32(dc);
                     int dg = SkGetPackedG32(dc);
                     int db = SkGetPackedB32(dc);
                     if (dstNeedsUnpremul) {
                         SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(da);
                         dr = SkUnPreMultiply::ApplyScale(scale, dr);
                         dg = SkUnPreMultiply::ApplyScale(scale, dg);
                         db = SkUnPreMultiply::ApplyScale(scale, db);
                     }
                     a = arith(k1, k2, k3, k4, sa, da);
                     r = arith(k1, k2, k3, k4, sr, dr);
                     g = arith(k1, k2, k3, k4, sg, dg);
                     b = arith(k1, k2, k3, k4, sb, db);
                 }
             } else {
                 a = arith(k1, k2, k3, k4, SkGetPackedA32(sc), SkGetPackedA32(dc));
                 r = arith(k1, k2, k3, k4, SkGetPackedR32(sc), SkGetPackedR32(dc));
                 r = SkMin32(r, a);
                 g = arith(k1, k2, k3, k4, SkGetPackedG32(sc), SkGetPackedG32(dc));
                 g = SkMin32(g, a);
                 b = arith(k1, k2, k3, k4, SkGetPackedB32(sc), SkGetPackedB32(dc));
                 b = SkMin32(b, a);
             }
             // apply antialias coverage if necessary
             if (aaCoverage && 0xFF != aaCoverage[i]) {
                 int scale = aaCoverage[i] + (aaCoverage[i] >> 7);
                 a = blend(a, SkGetPackedA32(sc), scale);
                 r = blend(r, SkGetPackedR32(sc), scale);
                 g = blend(g, SkGetPackedG32(sc), scale);
                 b = blend(b, SkGetPackedB32(sc), scale);
             }
             // turn the result back into premul
             if (gUseUnpremul && (0xFF != a)) {
                 int scale = a + (a >> 7);
                 r = SkAlphaMul(r, scale);
                 g = SkAlphaMul(g, scale);
                 b = SkAlphaMul(b, scale);
             }
             dst[i] = SkPackARGB32(a, r, g, b);
         }
     }
 }
 #ifndef SK_IGNORE_TO_STRING
 void SkArithmeticMode_scalar::toString(SkString* str) const {
     str->append("SkArithmeticMode_scalar: ");
     for (int i = 0; i < 4; ++i) {
         str->appendScalar(fK[i]);
         if (i < 3) {
             str->append(" ");
         }
     }
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 static bool fitsInBits(SkScalar x, int bits) {
     return SkScalarAbs(x) < (1 << (bits - 1));
 }
 #if 0 // UNUSED
 static int32_t toDot8(SkScalar x) {
     return (int32_t)(x * 256);
 }
 #endif
 SkXfermode* SkArithmeticMode::Create(SkScalar k1, SkScalar k2,
                                      SkScalar k3, SkScalar k4) {
     if (fitsInBits(k1, 8) && fitsInBits(k2, 16) &&
         fitsInBits(k2, 16) && fitsInBits(k2, 24)) {
 #if 0 // UNUSED
         int32_t i1 = toDot8(k1);
         int32_t i2 = toDot8(k2);
         int32_t i3 = toDot8(k3);
         int32_t i4 = toDot8(k4);
         if (i1) {
             return SkNEW_ARGS(SkArithmeticMode_quad, (i1, i2, i3, i4));
         }
         if (0 == i2) {
             return SkNEW_ARGS(SkArithmeticMode_dst, (i3, i4));
         }
         if (0 == i3) {
             return SkNEW_ARGS(SkArithmeticMode_src, (i2, i4));
         }
         return SkNEW_ARGS(SkArithmeticMode_linear, (i2, i3, i4));
 #endif
     }
     return SkArithmeticMode_scalar::Create(k1, k2, k3, k4);
 }
 //////////////////////////////////////////////////////////////////////////////
 #if SK_SUPPORT_GPU
 class GrGLArithmeticEffect : public GrGLEffect {
 public:
     GrGLArithmeticEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
     virtual ~GrGLArithmeticEffect();
     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 fKUni;
     typedef GrGLEffect INHERITED;
 };
 ///////////////////////////////////////////////////////////////////////////////
 class GrArithmeticEffect : public GrEffect {
 public:
     static GrEffectRef* Create(float k1, float k2, float k3, float k4, GrTexture* background) {
         AutoEffectUnref effect(SkNEW_ARGS(GrArithmeticEffect, (k1, k2, k3, k4, background)));
         return CreateEffectRef(effect);
     }
     virtual ~GrArithmeticEffect();
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
     typedef GrGLArithmeticEffect GLEffect;
     static const char* Name() { return "Arithmetic"; }
     GrTexture* backgroundTexture() const { return fBackgroundAccess.getTexture(); }
     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
     float k1() const { return fK1; }
     float k2() const { return fK2; }
     float k3() const { return fK3; }
     float k4() const { return fK4; }
 private:
     virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
     GrArithmeticEffect(float k1, float k2, float k3, float k4, GrTexture* background);
     float                       fK1, fK2, fK3, fK4;
     GrCoordTransform            fBackgroundTransform;
     GrTextureAccess             fBackgroundAccess;
     GR_DECLARE_EFFECT_TEST;
     typedef GrEffect INHERITED;
 };
 ///////////////////////////////////////////////////////////////////////////////
 GrArithmeticEffect::GrArithmeticEffect(float k1, float k2, float k3, float k4,
                                        GrTexture* background)
   : fK1(k1), fK2(k2), fK3(k3), fK4(k4) {
     if (background) {
         fBackgroundTransform.reset(kLocal_GrCoordSet, background);
         this->addCoordTransform(&fBackgroundTransform);
         fBackgroundAccess.reset(background);
         this->addTextureAccess(&fBackgroundAccess);
     } else {
         this->setWillReadDstColor();
     }
 }
 GrArithmeticEffect::~GrArithmeticEffect() {
 }
 bool GrArithmeticEffect::onIsEqual(const GrEffect& sBase) const {
     const GrArithmeticEffect& s = CastEffect<GrArithmeticEffect>(sBase);
     return fK1 == s.fK1 &&
            fK2 == s.fK2 &&
            fK3 == s.fK3 &&
            fK4 == s.fK4 &&
            backgroundTexture() == s.backgroundTexture();
 }
 const GrBackendEffectFactory& GrArithmeticEffect::getFactory() const {
     return GrTBackendEffectFactory<GrArithmeticEffect>::getInstance();
 }
 void GrArithmeticEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
     // TODO: optimize this
     *validFlags = 0;
 }
 ///////////////////////////////////////////////////////////////////////////////
 GrGLArithmeticEffect::GrGLArithmeticEffect(const GrBackendEffectFactory& factory,
                                            const GrDrawEffect& drawEffect)
    : INHERITED(factory) {
 }
 GrGLArithmeticEffect::~GrGLArithmeticEffect() {
 }
 void GrGLArithmeticEffect::emitCode(GrGLShaderBuilder* builder,
                                     const GrDrawEffect& drawEffect,
                                     EffectKey key,
                                     const char* outputColor,
                                     const char* inputColor,
                                     const TransformedCoordsArray& coords,
                                     const TextureSamplerArray& samplers) {
     GrTexture* backgroundTex = drawEffect.castEffect<GrArithmeticEffect>().backgroundTexture();
     const char* dstColor;
     if (backgroundTex) {
         builder->fsCodeAppend("\t\tvec4 bgColor = ");
         builder->fsAppendTextureLookup(samplers[0], coords[0].c_str(), coords[0].type());
         builder->fsCodeAppendf(";\n");
         dstColor = "bgColor";
     } else {
         dstColor = builder->dstColor();
     }
     SkASSERT(NULL != dstColor);
     fKUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                 kVec4f_GrSLType, "k");
     const char* kUni = builder->getUniformCStr(fKUni);
     // We don't try to optimize for this case at all
     if (NULL == inputColor) {
         builder->fsCodeAppendf("\t\tconst vec4 src = vec4(1);\n");
     } else {
         builder->fsCodeAppendf("\t\tvec4 src = %s;\n", inputColor);
         if (gUseUnpremul) {
             builder->fsCodeAppendf("\t\tsrc.rgb = clamp(src.rgb / src.a, 0.0, 1.0);\n");
         }
     }
     builder->fsCodeAppendf("\t\tvec4 dst = %s;\n", dstColor);
     if (gUseUnpremul) {
         builder->fsCodeAppendf("\t\tdst.rgb = clamp(dst.rgb / dst.a, 0.0, 1.0);\n");
     }
     builder->fsCodeAppendf("\t\t%s = %s.x * src * dst + %s.y * src + %s.z * dst + %s.w;\n", outputColor, kUni, kUni, kUni, kUni);
     builder->fsCodeAppendf("\t\t%s = clamp(%s, 0.0, 1.0);\n", outputColor, outputColor);
     if (gUseUnpremul) {
         builder->fsCodeAppendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
     } else {
         builder->fsCodeAppendf("\t\t%s.rgb = min(%s.rgb, %s.a);\n", outputColor, outputColor, outputColor);
     }
 }
 void GrGLArithmeticEffect::setData(const GrGLUniformManager& uman, const GrDrawEffect& drawEffect) {
     const GrArithmeticEffect& arith = drawEffect.castEffect<GrArithmeticEffect>();
     uman.set4f(fKUni, arith.k1(), arith.k2(), arith.k3(), arith.k4());
 }
 GrEffectRef* GrArithmeticEffect::TestCreate(SkRandom* rand,
                                             GrContext*,
                                             const GrDrawTargetCaps&,
                                             GrTexture*[]) {
     float k1 = rand->nextF();
     float k2 = rand->nextF();
     float k3 = rand->nextF();
     float k4 = rand->nextF();
     AutoEffectUnref gEffect(SkNEW_ARGS(GrArithmeticEffect, (k1, k2, k3, k4, NULL)));
     return CreateEffectRef(gEffect);
 }
 GR_DEFINE_EFFECT_TEST(GrArithmeticEffect);
 bool SkArithmeticMode_scalar::asNewEffect(GrEffectRef** effect, GrTexture* background) const {
     if (effect) {
         *effect = GrArithmeticEffect::Create(SkScalarToFloat(fK[0]),
                                              SkScalarToFloat(fK[1]),
                                              SkScalarToFloat(fK[2]),
                                              SkScalarToFloat(fK[3]),
                                              background);
     }
     return true;
 }
 #endif
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END

The Tor Browser / annotate

gfx/skia/trunk/src/effects/SkArithmeticMode.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/effects/SkArithmeticMode.cpp