| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkColorMatrixFilterRowMajor255.h" |
| #include "SkColorPriv.h" |
| #include "SkNx.h" |
| #include "SkPM4fPriv.h" |
| #include "SkReadBuffer.h" |
| #include "SkRefCnt.h" |
| #include "SkString.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkWriteBuffer.h" |
| |
| static void transpose(float dst[20], const float src[20]) { |
| const float* srcR = src + 0; |
| const float* srcG = src + 5; |
| const float* srcB = src + 10; |
| const float* srcA = src + 15; |
| |
| for (int i = 0; i < 20; i += 4) { |
| dst[i + 0] = *srcR++; |
| dst[i + 1] = *srcG++; |
| dst[i + 2] = *srcB++; |
| dst[i + 3] = *srcA++; |
| } |
| } |
| |
| void SkColorMatrixFilterRowMajor255::initState() { |
| transpose(fTranspose, fMatrix); |
| |
| const float* array = fMatrix; |
| |
| // check if we have to munge Alpha |
| bool changesAlpha = (array[15] || array[16] || array[17] || (array[18] - 1) || array[19]); |
| bool usesAlpha = (array[3] || array[8] || array[13]); |
| |
| if (changesAlpha || usesAlpha) { |
| fFlags = changesAlpha ? 0 : kAlphaUnchanged_Flag; |
| } else { |
| fFlags = kAlphaUnchanged_Flag; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkColorMatrixFilterRowMajor255::SkColorMatrixFilterRowMajor255(const SkScalar array[20]) { |
| memcpy(fMatrix, array, 20 * sizeof(SkScalar)); |
| this->initState(); |
| } |
| |
| uint32_t SkColorMatrixFilterRowMajor255::getFlags() const { |
| return this->INHERITED::getFlags() | fFlags; |
| } |
| |
| static Sk4f scale_rgb(float scale) { |
| static_assert(SkPM4f::A == 3, "Alpha is lane 3"); |
| return Sk4f(scale, scale, scale, 1); |
| } |
| |
| static Sk4f premul(const Sk4f& x) { |
| return x * scale_rgb(x[SkPM4f::A]); |
| } |
| |
| static Sk4f unpremul(const Sk4f& x) { |
| return x * scale_rgb(1 / x[SkPM4f::A]); // TODO: fast/approx invert? |
| } |
| |
| static Sk4f clamp_0_1(const Sk4f& x) { |
| return Sk4f::Max(Sk4f::Min(x, Sk4f(1)), Sk4f(0)); |
| } |
| |
| static SkPMColor round(const Sk4f& x) { |
| SkPMColor c; |
| SkNx_cast<uint8_t>(x * Sk4f(255) + Sk4f(0.5f)).store(&c); |
| return c; |
| } |
| |
| template <typename Adaptor, typename T> |
| void filter_span(const float array[], const T src[], int count, T dst[]) { |
| // c0-c3 are already in [0,1]. |
| const Sk4f c0 = Sk4f::Load(array + 0); |
| const Sk4f c1 = Sk4f::Load(array + 4); |
| const Sk4f c2 = Sk4f::Load(array + 8); |
| const Sk4f c3 = Sk4f::Load(array + 12); |
| // c4 (the translate vector) is in [0, 255]. Bring it back to [0,1]. |
| const Sk4f c4 = Sk4f::Load(array + 16)*Sk4f(1.0f/255); |
| |
| // todo: we could cache this in the constructor... |
| T matrix_translate_pmcolor = Adaptor::From4f(premul(clamp_0_1(c4))); |
| |
| for (int i = 0; i < count; i++) { |
| Sk4f srcf = Adaptor::To4f(src[i]); |
| float srcA = srcf[SkPM4f::A]; |
| |
| if (0 == srcA) { |
| dst[i] = matrix_translate_pmcolor; |
| continue; |
| } |
| if (1 != srcA) { |
| srcf = unpremul(srcf); |
| } |
| |
| Sk4f r4 = srcf[Adaptor::R]; |
| Sk4f g4 = srcf[Adaptor::G]; |
| Sk4f b4 = srcf[Adaptor::B]; |
| Sk4f a4 = srcf[Adaptor::A]; |
| // apply matrix |
| Sk4f dst4 = c0 * r4 + c1 * g4 + c2 * b4 + c3 * a4 + c4; |
| |
| dst[i] = Adaptor::From4f(premul(clamp_0_1(dst4))); |
| } |
| } |
| |
| struct SkPMColorAdaptor { |
| enum { |
| R = SK_R_INDEX, |
| G = SK_G_INDEX, |
| B = SK_B_INDEX, |
| A = SK_A_INDEX, |
| }; |
| static SkPMColor From4f(const Sk4f& c4) { |
| return round(swizzle_rb_if_bgra(c4)); |
| } |
| static Sk4f To4f(SkPMColor c) { |
| return to_4f(c) * Sk4f(1.0f/255); |
| } |
| }; |
| void SkColorMatrixFilterRowMajor255::filterSpan(const SkPMColor src[], int count, SkPMColor dst[]) const { |
| filter_span<SkPMColorAdaptor>(fTranspose, src, count, dst); |
| } |
| |
| struct SkPM4fAdaptor { |
| enum { |
| R = SkPM4f::R, |
| G = SkPM4f::G, |
| B = SkPM4f::B, |
| A = SkPM4f::A, |
| }; |
| static SkPM4f From4f(const Sk4f& c4) { |
| return SkPM4f::From4f(c4); |
| } |
| static Sk4f To4f(const SkPM4f& c) { |
| return c.to4f(); |
| } |
| }; |
| void SkColorMatrixFilterRowMajor255::filterSpan4f(const SkPM4f src[], int count, SkPM4f dst[]) const { |
| filter_span<SkPM4fAdaptor>(fTranspose, src, count, dst); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkColorMatrixFilterRowMajor255::flatten(SkWriteBuffer& buffer) const { |
| SkASSERT(sizeof(fMatrix)/sizeof(SkScalar) == 20); |
| buffer.writeScalarArray(fMatrix, 20); |
| } |
| |
| sk_sp<SkFlattenable> SkColorMatrixFilterRowMajor255::CreateProc(SkReadBuffer& buffer) { |
| SkScalar matrix[20]; |
| if (buffer.readScalarArray(matrix, 20)) { |
| return sk_make_sp<SkColorMatrixFilterRowMajor255>(matrix); |
| } |
| return nullptr; |
| } |
| |
| bool SkColorMatrixFilterRowMajor255::asColorMatrix(SkScalar matrix[20]) const { |
| if (matrix) { |
| memcpy(matrix, fMatrix, 20 * sizeof(SkScalar)); |
| } |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // This code was duplicated from src/effects/SkColorMatrixc.cpp in order to be used in core. |
| ////// |
| |
| // To detect if we need to apply clamping after applying a matrix, we check if |
| // any output component might go outside of [0, 255] for any combination of |
| // input components in [0..255]. |
| // Each output component is an affine transformation of the input component, so |
| // the minimum and maximum values are for any combination of minimum or maximum |
| // values of input components (i.e. 0 or 255). |
| // E.g. if R' = x*R + y*G + z*B + w*A + t |
| // Then the maximum value will be for R=255 if x>0 or R=0 if x<0, and the |
| // minimum value will be for R=0 if x>0 or R=255 if x<0. |
| // Same goes for all components. |
| static bool component_needs_clamping(const SkScalar row[5]) { |
| SkScalar maxValue = row[4] / 255; |
| SkScalar minValue = row[4] / 255; |
| for (int i = 0; i < 4; ++i) { |
| if (row[i] > 0) |
| maxValue += row[i]; |
| else |
| minValue += row[i]; |
| } |
| return (maxValue > 1) || (minValue < 0); |
| } |
| |
| static bool needs_clamping(const SkScalar matrix[20]) { |
| return component_needs_clamping(matrix) |
| || component_needs_clamping(matrix+5) |
| || component_needs_clamping(matrix+10) |
| || component_needs_clamping(matrix+15); |
| } |
| |
| static void set_concat(SkScalar result[20], const SkScalar outer[20], const SkScalar inner[20]) { |
| int index = 0; |
| for (int j = 0; j < 20; j += 5) { |
| for (int i = 0; i < 4; i++) { |
| result[index++] = outer[j + 0] * inner[i + 0] + |
| outer[j + 1] * inner[i + 5] + |
| outer[j + 2] * inner[i + 10] + |
| outer[j + 3] * inner[i + 15]; |
| } |
| result[index++] = outer[j + 0] * inner[4] + |
| outer[j + 1] * inner[9] + |
| outer[j + 2] * inner[14] + |
| outer[j + 3] * inner[19] + |
| outer[j + 4]; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // End duplication |
| ////// |
| |
| sk_sp<SkColorFilter> |
| SkColorMatrixFilterRowMajor255::makeComposed(sk_sp<SkColorFilter> innerFilter) const { |
| SkScalar innerMatrix[20]; |
| if (innerFilter->asColorMatrix(innerMatrix) && !needs_clamping(innerMatrix)) { |
| SkScalar concat[20]; |
| set_concat(concat, fMatrix, innerMatrix); |
| return sk_make_sp<SkColorMatrixFilterRowMajor255>(concat); |
| } |
| return nullptr; |
| } |
| |
| #if SK_SUPPORT_GPU |
| #include "GrFragmentProcessor.h" |
| #include "GrInvariantOutput.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| #include "glsl/GrGLSLUniformHandler.h" |
| |
| class ColorMatrixEffect : public GrFragmentProcessor { |
| public: |
| static sk_sp<GrFragmentProcessor> Make(const SkScalar matrix[20]) { |
| return sk_sp<GrFragmentProcessor>(new ColorMatrixEffect(matrix)); |
| } |
| |
| const char* name() const override { return "Color Matrix"; } |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
| |
| class GLSLProcessor : public GrGLSLFragmentProcessor { |
| public: |
| // this class always generates the same code. |
| static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) {} |
| |
| void emitCode(EmitArgs& args) override { |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| fMatrixHandle = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kMat44f_GrSLType, kDefault_GrSLPrecision, |
| "ColorMatrix"); |
| fVectorHandle = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec4f_GrSLType, kDefault_GrSLPrecision, |
| "ColorMatrixVector"); |
| |
| if (nullptr == args.fInputColor) { |
| // could optimize this case, but we aren't for now. |
| args.fInputColor = "vec4(1)"; |
| } |
| GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder; |
| // The max() is to guard against 0 / 0 during unpremul when the incoming color is |
| // transparent black. |
| fragBuilder->codeAppendf("\tfloat nonZeroAlpha = max(%s.a, 0.00001);\n", |
| args.fInputColor); |
| fragBuilder->codeAppendf("\t%s = %s * vec4(%s.rgb / nonZeroAlpha, nonZeroAlpha) + %s;\n", |
| args.fOutputColor, |
| uniformHandler->getUniformCStr(fMatrixHandle), |
| args.fInputColor, |
| uniformHandler->getUniformCStr(fVectorHandle)); |
| fragBuilder->codeAppendf("\t%s = clamp(%s, 0.0, 1.0);\n", |
| args.fOutputColor, args.fOutputColor); |
| fragBuilder->codeAppendf("\t%s.rgb *= %s.a;\n", args.fOutputColor, args.fOutputColor); |
| } |
| |
| protected: |
| void onSetData(const GrGLSLProgramDataManager& uniManager, |
| const GrProcessor& proc) override { |
| const ColorMatrixEffect& cme = proc.cast<ColorMatrixEffect>(); |
| const float* m = cme.fMatrix; |
| // The GL matrix is transposed from SkColorMatrix. |
| float mt[] = { |
| m[0], m[5], m[10], m[15], |
| m[1], m[6], m[11], m[16], |
| m[2], m[7], m[12], m[17], |
| m[3], m[8], m[13], m[18], |
| }; |
| static const float kScale = 1.0f / 255.0f; |
| float vec[] = { |
| m[4] * kScale, m[9] * kScale, m[14] * kScale, m[19] * kScale, |
| }; |
| uniManager.setMatrix4fv(fMatrixHandle, 1, mt); |
| uniManager.set4fv(fVectorHandle, 1, vec); |
| } |
| |
| private: |
| GrGLSLProgramDataManager::UniformHandle fMatrixHandle; |
| GrGLSLProgramDataManager::UniformHandle fVectorHandle; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| private: |
| ColorMatrixEffect(const SkScalar matrix[20]) { |
| memcpy(fMatrix, matrix, sizeof(SkScalar) * 20); |
| this->initClassID<ColorMatrixEffect>(); |
| } |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { |
| return new GLSLProcessor; |
| } |
| |
| virtual void onGetGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const override { |
| GLSLProcessor::GenKey(*this, caps, b); |
| } |
| |
| bool onIsEqual(const GrFragmentProcessor& s) const override { |
| const ColorMatrixEffect& cme = s.cast<ColorMatrixEffect>(); |
| return 0 == memcmp(fMatrix, cme.fMatrix, sizeof(fMatrix)); |
| } |
| |
| void onComputeInvariantOutput(GrInvariantOutput* inout) const override { |
| // We only bother to check whether the alpha channel will be constant. If SkColorMatrix had |
| // type flags it might be worth checking the other components. |
| |
| // The matrix is defined such the 4th row determines the output alpha. The first four |
| // columns of that row multiply the input r, g, b, and a, respectively, and the last column |
| // is the "translation". |
| static const uint32_t kRGBAFlags[] = { |
| kR_GrColorComponentFlag, |
| kG_GrColorComponentFlag, |
| kB_GrColorComponentFlag, |
| kA_GrColorComponentFlag |
| }; |
| static const int kShifts[] = { |
| GrColor_SHIFT_R, GrColor_SHIFT_G, GrColor_SHIFT_B, GrColor_SHIFT_A, |
| }; |
| enum { |
| kAlphaRowStartIdx = 15, |
| kAlphaRowTranslateIdx = 19, |
| }; |
| |
| SkScalar outputA = 0; |
| for (int i = 0; i < 4; ++i) { |
| // If any relevant component of the color to be passed through the matrix is non-const |
| // then we can't know the final result. |
| if (0 != fMatrix[kAlphaRowStartIdx + i]) { |
| if (!(inout->validFlags() & kRGBAFlags[i])) { |
| inout->setToUnknown(GrInvariantOutput::kWill_ReadInput); |
| return; |
| } else { |
| uint32_t component = (inout->color() >> kShifts[i]) & 0xFF; |
| outputA += fMatrix[kAlphaRowStartIdx + i] * component; |
| } |
| } |
| } |
| outputA += fMatrix[kAlphaRowTranslateIdx]; |
| // We pin the color to [0,1]. This would happen to the *final* color output from the frag |
| // shader but currently the effect does not pin its own output. So in the case of over/ |
| // underflow this may deviate from the actual result. Maybe the effect should pin its |
| // result if the matrix could over/underflow for any component? |
| inout->setToOther(kA_GrColorComponentFlag, |
| static_cast<uint8_t>(SkScalarPin(outputA, 0, 255)) << GrColor_SHIFT_A, |
| GrInvariantOutput::kWill_ReadInput); |
| } |
| |
| SkScalar fMatrix[20]; |
| |
| typedef GrFragmentProcessor INHERITED; |
| }; |
| |
| GR_DEFINE_FRAGMENT_PROCESSOR_TEST(ColorMatrixEffect); |
| |
| sk_sp<GrFragmentProcessor> ColorMatrixEffect::TestCreate(GrProcessorTestData* d) { |
| SkScalar colorMatrix[20]; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(colorMatrix); ++i) { |
| colorMatrix[i] = d->fRandom->nextSScalar1(); |
| } |
| return ColorMatrixEffect::Make(colorMatrix); |
| } |
| |
| sk_sp<GrFragmentProcessor> SkColorMatrixFilterRowMajor255::asFragmentProcessor(GrContext*) const { |
| return ColorMatrixEffect::Make(fMatrix); |
| } |
| |
| #endif |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkColorMatrixFilterRowMajor255::toString(SkString* str) const { |
| str->append("SkColorMatrixFilterRowMajor255: "); |
| |
| str->append("matrix: ("); |
| for (int i = 0; i < 20; ++i) { |
| str->appendScalar(fMatrix[i]); |
| if (i < 19) { |
| str->append(", "); |
| } |
| } |
| str->append(")"); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkColorFilter> SkColorFilter::MakeMatrixFilterRowMajor255(const SkScalar array[20]) { |
| return sk_sp<SkColorFilter>(new SkColorMatrixFilterRowMajor255(array)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkColorFilter> |
| SkColorMatrixFilterRowMajor255::MakeSingleChannelOutput(const SkScalar row[5]) { |
| SkASSERT(row); |
| auto cf = sk_make_sp<SkColorMatrixFilterRowMajor255>(); |
| static_assert(sizeof(SkScalar) * 5 * 4 == sizeof(cf->fMatrix), "sizes don't match"); |
| for (int i = 0; i < 4; ++i) { |
| memcpy(cf->fMatrix + 5 * i, row, sizeof(SkScalar) * 5); |
| } |
| cf->initState(); |
| return cf; |
| } |
