| /* |
| * 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 "SkDisplacementMapEffect.h" |
| |
| #include "SkBitmap.h" |
| #include "SkReadBuffer.h" |
| #include "SkSpecialImage.h" |
| #include "SkWriteBuffer.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkColorPriv.h" |
| #if SK_SUPPORT_GPU |
| #include "GrContext.h" |
| #include "GrDrawContext.h" |
| #include "GrCoordTransform.h" |
| #include "GrInvariantOutput.h" |
| #include "SkGr.h" |
| #include "effects/GrTextureDomain.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| #include "glsl/GrGLSLUniformHandler.h" |
| #endif |
| |
| namespace { |
| |
| #define kChannelSelectorKeyBits 3; // Max value is 4, so 3 bits are required at most |
| |
| template<SkDisplacementMapEffect::ChannelSelectorType type> |
| uint32_t getValue(SkColor, const SkUnPreMultiply::Scale*) { |
| SkDEBUGFAIL("Unknown channel selector"); |
| return 0; |
| } |
| |
| template<> uint32_t getValue<SkDisplacementMapEffect::kR_ChannelSelectorType>( |
| SkColor l, const SkUnPreMultiply::Scale* table) { |
| return SkUnPreMultiply::ApplyScale(table[SkGetPackedA32(l)], SkGetPackedR32(l)); |
| } |
| |
| template<> uint32_t getValue<SkDisplacementMapEffect::kG_ChannelSelectorType>( |
| SkColor l, const SkUnPreMultiply::Scale* table) { |
| return SkUnPreMultiply::ApplyScale(table[SkGetPackedA32(l)], SkGetPackedG32(l)); |
| } |
| |
| template<> uint32_t getValue<SkDisplacementMapEffect::kB_ChannelSelectorType>( |
| SkColor l, const SkUnPreMultiply::Scale* table) { |
| return SkUnPreMultiply::ApplyScale(table[SkGetPackedA32(l)], SkGetPackedB32(l)); |
| } |
| |
| template<> uint32_t getValue<SkDisplacementMapEffect::kA_ChannelSelectorType>( |
| SkColor l, const SkUnPreMultiply::Scale*) { |
| return SkGetPackedA32(l); |
| } |
| |
| template<SkDisplacementMapEffect::ChannelSelectorType typeX, |
| SkDisplacementMapEffect::ChannelSelectorType typeY> |
| void computeDisplacement(const SkVector& scale, SkBitmap* dst, |
| const SkBitmap& displ, const SkIPoint& offset, |
| const SkBitmap& src, |
| const SkIRect& bounds) { |
| static const SkScalar Inv8bit = SkScalarInvert(255); |
| const int srcW = src.width(); |
| const int srcH = src.height(); |
| const SkVector scaleForColor = SkVector::Make(SkScalarMul(scale.fX, Inv8bit), |
| SkScalarMul(scale.fY, Inv8bit)); |
| const SkVector scaleAdj = SkVector::Make(SK_ScalarHalf - SkScalarMul(scale.fX, SK_ScalarHalf), |
| SK_ScalarHalf - SkScalarMul(scale.fY, SK_ScalarHalf)); |
| const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
| SkPMColor* dstPtr = dst->getAddr32(0, 0); |
| for (int y = bounds.top(); y < bounds.bottom(); ++y) { |
| const SkPMColor* displPtr = displ.getAddr32(bounds.left() + offset.fX, y + offset.fY); |
| for (int x = bounds.left(); x < bounds.right(); ++x, ++displPtr) { |
| const SkScalar displX = SkScalarMul(scaleForColor.fX, |
| SkIntToScalar(getValue<typeX>(*displPtr, table))) + scaleAdj.fX; |
| const SkScalar displY = SkScalarMul(scaleForColor.fY, |
| SkIntToScalar(getValue<typeY>(*displPtr, table))) + scaleAdj.fY; |
| // Truncate the displacement values |
| const int srcX = x + SkScalarTruncToInt(displX); |
| const int srcY = y + SkScalarTruncToInt(displY); |
| *dstPtr++ = ((srcX < 0) || (srcX >= srcW) || (srcY < 0) || (srcY >= srcH)) ? |
| 0 : *(src.getAddr32(srcX, srcY)); |
| } |
| } |
| } |
| |
| template<SkDisplacementMapEffect::ChannelSelectorType typeX> |
| void computeDisplacement(SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, SkBitmap* dst, |
| const SkBitmap& displ, const SkIPoint& offset, |
| const SkBitmap& src, |
| const SkIRect& bounds) { |
| switch (yChannelSelector) { |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| computeDisplacement<typeX, SkDisplacementMapEffect::kR_ChannelSelectorType>( |
| scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| computeDisplacement<typeX, SkDisplacementMapEffect::kG_ChannelSelectorType>( |
| scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| computeDisplacement<typeX, SkDisplacementMapEffect::kB_ChannelSelectorType>( |
| scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| computeDisplacement<typeX, SkDisplacementMapEffect::kA_ChannelSelectorType>( |
| scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| default: |
| SkDEBUGFAIL("Unknown Y channel selector"); |
| } |
| } |
| |
| void computeDisplacement(SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, SkBitmap* dst, |
| const SkBitmap& displ, const SkIPoint& offset, |
| const SkBitmap& src, |
| const SkIRect& bounds) { |
| switch (xChannelSelector) { |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| computeDisplacement<SkDisplacementMapEffect::kR_ChannelSelectorType>( |
| yChannelSelector, scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| computeDisplacement<SkDisplacementMapEffect::kG_ChannelSelectorType>( |
| yChannelSelector, scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| computeDisplacement<SkDisplacementMapEffect::kB_ChannelSelectorType>( |
| yChannelSelector, scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| computeDisplacement<SkDisplacementMapEffect::kA_ChannelSelectorType>( |
| yChannelSelector, scale, dst, displ, offset, src, bounds); |
| break; |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| default: |
| SkDEBUGFAIL("Unknown X channel selector"); |
| } |
| } |
| |
| bool channel_selector_type_is_valid(SkDisplacementMapEffect::ChannelSelectorType cst) { |
| switch (cst) { |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| return true; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| } // end namespace |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkImageFilter> SkDisplacementMapEffect::Make(ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, |
| SkScalar scale, |
| sk_sp<SkImageFilter> displacement, |
| sk_sp<SkImageFilter> color, |
| const CropRect* cropRect) { |
| if (!channel_selector_type_is_valid(xChannelSelector) || |
| !channel_selector_type_is_valid(yChannelSelector)) { |
| return nullptr; |
| } |
| |
| sk_sp<SkImageFilter> inputs[2] = { std::move(displacement), std::move(color) }; |
| return sk_sp<SkImageFilter>(new SkDisplacementMapEffect(xChannelSelector, |
| yChannelSelector, |
| scale, inputs, cropRect)); |
| } |
| |
| SkDisplacementMapEffect::SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, |
| SkScalar scale, |
| sk_sp<SkImageFilter> inputs[2], |
| const CropRect* cropRect) |
| : INHERITED(inputs, 2, cropRect) |
| , fXChannelSelector(xChannelSelector) |
| , fYChannelSelector(yChannelSelector) |
| , fScale(scale) { |
| } |
| |
| SkDisplacementMapEffect::~SkDisplacementMapEffect() { |
| } |
| |
| sk_sp<SkFlattenable> SkDisplacementMapEffect::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2); |
| ChannelSelectorType xsel = (ChannelSelectorType)buffer.readInt(); |
| ChannelSelectorType ysel = (ChannelSelectorType)buffer.readInt(); |
| SkScalar scale = buffer.readScalar(); |
| return Make(xsel, ysel, scale, |
| common.getInput(0), common.getInput(1), |
| &common.cropRect()); |
| } |
| |
| void SkDisplacementMapEffect::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeInt((int) fXChannelSelector); |
| buffer.writeInt((int) fYChannelSelector); |
| buffer.writeScalar(fScale); |
| } |
| |
| #if SK_SUPPORT_GPU |
| class GrDisplacementMapEffect : public GrFragmentProcessor { |
| public: |
| static GrFragmentProcessor* Create( |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, SkVector scale, |
| GrTexture* displacement, const SkMatrix& offsetMatrix, GrTexture* color, |
| const SkISize& colorDimensions) { |
| return new GrDisplacementMapEffect(xChannelSelector, yChannelSelector, scale, displacement, |
| offsetMatrix, color, colorDimensions); |
| } |
| |
| virtual ~GrDisplacementMapEffect(); |
| |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector() const { |
| return fXChannelSelector; |
| } |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector() const { |
| return fYChannelSelector; |
| } |
| const SkVector& scale() const { return fScale; } |
| |
| const char* name() const override { return "DisplacementMap"; } |
| const GrTextureDomain& domain() const { return fDomain; } |
| |
| private: |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
| |
| GrDisplacementMapEffect(SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, |
| GrTexture* displacement, const SkMatrix& offsetMatrix, |
| GrTexture* color, |
| const SkISize& colorDimensions); |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
| |
| GrCoordTransform fDisplacementTransform; |
| GrTextureAccess fDisplacementAccess; |
| GrCoordTransform fColorTransform; |
| GrTextureDomain fDomain; |
| GrTextureAccess fColorAccess; |
| SkDisplacementMapEffect::ChannelSelectorType fXChannelSelector; |
| SkDisplacementMapEffect::ChannelSelectorType fYChannelSelector; |
| SkVector fScale; |
| |
| typedef GrFragmentProcessor INHERITED; |
| }; |
| #endif |
| |
| sk_sp<SkSpecialImage> SkDisplacementMapEffect::onFilterImage(SkSpecialImage* source, |
| const Context& ctx, |
| SkIPoint* offset) const { |
| SkIPoint colorOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> color(this->filterInput(1, source, ctx, &colorOffset)); |
| if (!color) { |
| return nullptr; |
| } |
| |
| SkIPoint displOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> displ(this->filterInput(0, source, ctx, &displOffset)); |
| if (!displ) { |
| return nullptr; |
| } |
| |
| const SkIRect srcBounds = SkIRect::MakeXYWH(colorOffset.x(), colorOffset.y(), |
| color->width(), color->height()); |
| |
| // Both paths do bounds checking on color pixel access, we don't need to |
| // pad the color bitmap to bounds here. |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, srcBounds, &bounds)) { |
| return nullptr; |
| } |
| |
| SkIRect displBounds; |
| displ = this->applyCropRect(ctx, displ.get(), &displOffset, &displBounds); |
| if (!displ) { |
| return nullptr; |
| } |
| |
| if (!bounds.intersect(displBounds)) { |
| return nullptr; |
| } |
| |
| const SkIRect colorBounds = bounds.makeOffset(-colorOffset.x(), -colorOffset.y()); |
| |
| SkVector scale = SkVector::Make(fScale, fScale); |
| ctx.ctm().mapVectors(&scale, 1); |
| |
| #if SK_SUPPORT_GPU |
| if (source->isTextureBacked()) { |
| GrContext* context = source->getContext(); |
| |
| sk_sp<GrTexture> colorTexture(color->asTextureRef(context)); |
| sk_sp<GrTexture> displTexture(displ->asTextureRef(context)); |
| if (!colorTexture || !displTexture) { |
| return nullptr; |
| } |
| |
| GrPaint paint; |
| SkMatrix offsetMatrix = GrCoordTransform::MakeDivByTextureWHMatrix(displTexture.get()); |
| offsetMatrix.preTranslate(SkIntToScalar(colorOffset.fX - displOffset.fX), |
| SkIntToScalar(colorOffset.fY - displOffset.fY)); |
| |
| paint.addColorFragmentProcessor( |
| GrDisplacementMapEffect::Create(fXChannelSelector, |
| fYChannelSelector, |
| scale, |
| displTexture.get(), |
| offsetMatrix, |
| colorTexture.get(), |
| SkISize::Make(color->width(), |
| color->height())))->unref(); |
| paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode); |
| SkMatrix matrix; |
| matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y())); |
| |
| sk_sp<GrDrawContext> drawContext(context->newDrawContext(SkBackingFit::kApprox, |
| bounds.width(), bounds.height(), |
| kSkia8888_GrPixelConfig)); |
| if (!drawContext) { |
| return nullptr; |
| } |
| |
| drawContext->drawRect(GrNoClip(), paint, matrix, SkRect::Make(colorBounds)); |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(bounds.width(), bounds.height()), |
| kNeedNewImageUniqueID_SpecialImage, |
| drawContext->asTexture()); |
| } |
| #endif |
| |
| SkBitmap colorBM, displBM; |
| |
| if (!color->getROPixels(&colorBM) || !displ->getROPixels(&displBM)) { |
| return nullptr; |
| } |
| |
| if ((colorBM.colorType() != kN32_SkColorType) || |
| (displBM.colorType() != kN32_SkColorType)) { |
| return nullptr; |
| } |
| |
| SkAutoLockPixels colorLock(colorBM), displLock(displBM); |
| if (!colorBM.getPixels() || !displBM.getPixels()) { |
| return nullptr; |
| } |
| |
| SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(), |
| colorBM.alphaType()); |
| |
| SkBitmap dst; |
| if (!dst.tryAllocPixels(info)) { |
| return nullptr; |
| } |
| |
| SkAutoLockPixels dstLock(dst); |
| |
| computeDisplacement(fXChannelSelector, fYChannelSelector, scale, &dst, |
| displBM, colorOffset - displOffset, colorBM, colorBounds); |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()), |
| dst); |
| } |
| |
| SkRect SkDisplacementMapEffect::computeFastBounds(const SkRect& src) const { |
| SkRect bounds = this->getColorInput() ? this->getColorInput()->computeFastBounds(src) : src; |
| bounds.outset(SkScalarAbs(fScale) * SK_ScalarHalf, SkScalarAbs(fScale) * SK_ScalarHalf); |
| return bounds; |
| } |
| |
| SkIRect SkDisplacementMapEffect::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm, |
| MapDirection) const { |
| SkVector scale = SkVector::Make(fScale, fScale); |
| ctm.mapVectors(&scale, 1); |
| return src.makeOutset(SkScalarCeilToInt(SkScalarAbs(scale.fX) * SK_ScalarHalf), |
| SkScalarCeilToInt(SkScalarAbs(scale.fY) * SK_ScalarHalf)); |
| } |
| |
| SkIRect SkDisplacementMapEffect::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| MapDirection direction) const { |
| // Recurse only into color input. |
| if (this->getColorInput()) { |
| return this->getColorInput()->filterBounds(src, ctm, direction); |
| } |
| return src; |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkDisplacementMapEffect::toString(SkString* str) const { |
| str->appendf("SkDisplacementMapEffect: ("); |
| str->appendf("scale: %f ", fScale); |
| str->appendf("displacement: ("); |
| if (this->getDisplacementInput()) { |
| this->getDisplacementInput()->toString(str); |
| } |
| str->appendf(") color: ("); |
| if (this->getColorInput()) { |
| this->getColorInput()->toString(str); |
| } |
| str->appendf("))"); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| class GrGLDisplacementMapEffect : public GrGLSLFragmentProcessor { |
| public: |
| void emitCode(EmitArgs&) override; |
| |
| static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); |
| |
| protected: |
| void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; |
| |
| private: |
| GrGLSLProgramDataManager::UniformHandle fScaleUni; |
| GrTextureDomain::GLDomain fGLDomain; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrGLSLFragmentProcessor* GrDisplacementMapEffect::onCreateGLSLInstance() const { |
| return new GrGLDisplacementMapEffect; |
| } |
| |
| void GrDisplacementMapEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDisplacementMapEffect::GenKey(*this, caps, b); |
| } |
| |
| GrDisplacementMapEffect::GrDisplacementMapEffect( |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, |
| GrTexture* displacement, |
| const SkMatrix& offsetMatrix, |
| GrTexture* color, |
| const SkISize& colorDimensions) |
| : fDisplacementTransform(kLocal_GrCoordSet, offsetMatrix, displacement, |
| GrTextureParams::kNone_FilterMode) |
| , fDisplacementAccess(displacement) |
| , fColorTransform(kLocal_GrCoordSet, color, GrTextureParams::kNone_FilterMode) |
| , fDomain(GrTextureDomain::MakeTexelDomain(color, SkIRect::MakeSize(colorDimensions)), |
| GrTextureDomain::kDecal_Mode) |
| , fColorAccess(color) |
| , fXChannelSelector(xChannelSelector) |
| , fYChannelSelector(yChannelSelector) |
| , fScale(scale) { |
| this->initClassID<GrDisplacementMapEffect>(); |
| this->addCoordTransform(&fDisplacementTransform); |
| this->addTextureAccess(&fDisplacementAccess); |
| this->addCoordTransform(&fColorTransform); |
| this->addTextureAccess(&fColorAccess); |
| } |
| |
| GrDisplacementMapEffect::~GrDisplacementMapEffect() { |
| } |
| |
| bool GrDisplacementMapEffect::onIsEqual(const GrFragmentProcessor& sBase) const { |
| const GrDisplacementMapEffect& s = sBase.cast<GrDisplacementMapEffect>(); |
| return fXChannelSelector == s.fXChannelSelector && |
| fYChannelSelector == s.fYChannelSelector && |
| fScale == s.fScale; |
| } |
| |
| void GrDisplacementMapEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { |
| // Any displacement offset bringing a pixel out of bounds will output a color of (0,0,0,0), |
| // so the only way we'd get a constant alpha is if the input color image has a constant alpha |
| // and no displacement offset push any texture coordinates out of bounds OR if the constant |
| // alpha is 0. Since this isn't trivial to compute at this point, let's assume the output is |
| // not of constant color when a displacement effect is applied. |
| inout->setToUnknown(GrInvariantOutput::kWillNot_ReadInput); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrDisplacementMapEffect); |
| |
| const GrFragmentProcessor* GrDisplacementMapEffect::TestCreate(GrProcessorTestData* d) { |
| int texIdxDispl = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| int texIdxColor = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| static const int kMaxComponent = 4; |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector = |
| static_cast<SkDisplacementMapEffect::ChannelSelectorType>( |
| d->fRandom->nextRangeU(1, kMaxComponent)); |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector = |
| static_cast<SkDisplacementMapEffect::ChannelSelectorType>( |
| d->fRandom->nextRangeU(1, kMaxComponent)); |
| SkVector scale = SkVector::Make(d->fRandom->nextRangeScalar(0, 100.0f), |
| d->fRandom->nextRangeScalar(0, 100.0f)); |
| SkISize colorDimensions; |
| colorDimensions.fWidth = d->fRandom->nextRangeU(0, d->fTextures[texIdxColor]->width()); |
| colorDimensions.fHeight = d->fRandom->nextRangeU(0, d->fTextures[texIdxColor]->height()); |
| return GrDisplacementMapEffect::Create(xChannelSelector, yChannelSelector, scale, |
| d->fTextures[texIdxDispl], SkMatrix::I(), |
| d->fTextures[texIdxColor], colorDimensions); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) { |
| const GrDisplacementMapEffect& displacementMap = args.fFp.cast<GrDisplacementMapEffect>(); |
| const GrTextureDomain& domain = displacementMap.domain(); |
| |
| fScaleUni = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, "Scale"); |
| const char* scaleUni = args.fUniformHandler->getUniformCStr(fScaleUni); |
| const char* dColor = "dColor"; |
| const char* cCoords = "cCoords"; |
| const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half float, use |
| // a number smaller than that to approximate 0, but |
| // leave room for 32-bit float GPU rounding errors. |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| fragBuilder->codeAppendf("\t\tvec4 %s = ", dColor); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fCoords[0].c_str(), |
| args.fCoords[0].getType()); |
| fragBuilder->codeAppend(";\n"); |
| |
| // Unpremultiply the displacement |
| fragBuilder->codeAppendf( |
| "\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb / %s.a, 0.0, 1.0);", |
| dColor, dColor, nearZero, dColor, dColor); |
| SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 1); |
| fragBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", |
| cCoords, coords2D.c_str(), scaleUni, dColor); |
| |
| switch (displacementMap.xChannelSelector()) { |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| fragBuilder->codeAppend("r"); |
| break; |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| fragBuilder->codeAppend("g"); |
| break; |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| fragBuilder->codeAppend("b"); |
| break; |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| fragBuilder->codeAppend("a"); |
| break; |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| default: |
| SkDEBUGFAIL("Unknown X channel selector"); |
| } |
| |
| switch (displacementMap.yChannelSelector()) { |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| fragBuilder->codeAppend("r"); |
| break; |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| fragBuilder->codeAppend("g"); |
| break; |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| fragBuilder->codeAppend("b"); |
| break; |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| fragBuilder->codeAppend("a"); |
| break; |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| default: |
| SkDEBUGFAIL("Unknown Y channel selector"); |
| } |
| fragBuilder->codeAppend("-vec2(0.5));\t\t"); |
| |
| fGLDomain.sampleTexture(fragBuilder, |
| args.fUniformHandler, |
| args.fGLSLCaps, |
| domain, |
| args.fOutputColor, |
| SkString(cCoords), |
| args.fTexSamplers[1]); |
| fragBuilder->codeAppend(";\n"); |
| } |
| |
| void GrGLDisplacementMapEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
| const GrProcessor& proc) { |
| const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| GrTexture* colorTex = displacementMap.texture(1); |
| SkScalar scaleX = displacementMap.scale().fX / colorTex->width(); |
| SkScalar scaleY = displacementMap.scale().fY / colorTex->height(); |
| pdman.set2f(fScaleUni, SkScalarToFloat(scaleX), |
| colorTex->origin() == kTopLeft_GrSurfaceOrigin ? |
| SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY)); |
| fGLDomain.setData(pdman, displacementMap.domain(), colorTex->origin()); |
| } |
| |
| void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc, |
| const GrGLSLCaps&, GrProcessorKeyBuilder* b) { |
| const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| |
| uint32_t xKey = displacementMap.xChannelSelector(); |
| uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits; |
| |
| b->add32(xKey | yKey); |
| } |
| #endif |