| /* |
| * 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 "SkColorSpaceXformer.h" |
| #include "SkReadBuffer.h" |
| #include "SkSpecialImage.h" |
| #include "SkWriteBuffer.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkColorPriv.h" |
| #if SK_SUPPORT_GPU |
| #include "GrClip.h" |
| #include "GrContext.h" |
| #include "GrCoordTransform.h" |
| #include "GrRenderTargetContext.h" |
| #include "GrTexture.h" |
| #include "GrTextureProxy.h" |
| #include "SkGr.h" |
| #include "effects/GrTextureDomain.h" |
| #include "glsl/GrGLSLColorSpaceXformHelper.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 |
| |
| const uint8_t gChannelTypeToShift[] = { |
| 0, // unknown |
| SK_R32_SHIFT, |
| SK_G32_SHIFT, |
| SK_B32_SHIFT, |
| SK_A32_SHIFT, |
| }; |
| struct Extractor { |
| Extractor(SkDisplacementMapEffect::ChannelSelectorType typeX, |
| SkDisplacementMapEffect::ChannelSelectorType typeY) |
| : fShiftX(gChannelTypeToShift[typeX]) |
| , fShiftY(gChannelTypeToShift[typeY]) |
| {} |
| |
| unsigned fShiftX, fShiftY; |
| |
| unsigned getX(SkPMColor c) const { return (c >> fShiftX) & 0xFF; } |
| unsigned getY(SkPMColor c) const { return (c >> fShiftY) & 0xFF; } |
| }; |
| |
| static SkPMColor unpremul_pm(SkPMColor c) { |
| const U8CPU a = SkGetPackedA32(c); |
| if (0 == a) { |
| return 0; |
| } else if (0xFF == a) { |
| return c; |
| } |
| const unsigned scale = SkUnPreMultiply::GetScale(a); |
| return SkPackARGB32NoCheck(a, |
| SkUnPreMultiply::ApplyScale(scale, SkGetPackedR32(c)), |
| SkUnPreMultiply::ApplyScale(scale, SkGetPackedG32(c)), |
| SkUnPreMultiply::ApplyScale(scale, SkGetPackedB32(c))); |
| } |
| |
| void computeDisplacement(Extractor ex, 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(scale.fX * Inv8bit, scale.fY * Inv8bit); |
| const SkVector scaleAdj = SkVector::Make(SK_ScalarHalf - scale.fX * SK_ScalarHalf, |
| SK_ScalarHalf - scale.fY * SK_ScalarHalf); |
| 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) { |
| SkPMColor c = unpremul_pm(*displPtr); |
| |
| SkScalar displX = scaleForColor.fX * ex.getX(c) + scaleAdj.fX; |
| SkScalar displY = scaleForColor.fY * ex.getY(c) + 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)); |
| } |
| } |
| } |
| |
| 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 sk_sp<GrFragmentProcessor> Make( |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, SkVector scale, |
| sk_sp<GrTextureProxy> displacement, const SkMatrix& offsetMatrix, |
| sk_sp<GrTextureProxy> color, |
| sk_sp<GrColorSpaceXform> colorSpaceXform, const SkISize& colorDimensions) { |
| return sk_sp<GrFragmentProcessor>( |
| new GrDisplacementMapEffect(xChannelSelector, yChannelSelector, scale, |
| std::move(displacement), |
| offsetMatrix, std::move(color), std::move(colorSpaceXform), |
| colorDimensions)); |
| } |
| |
| ~GrDisplacementMapEffect() override; |
| |
| 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; } |
| GrColorSpaceXform* colorSpaceXform() const { return fColorSpaceXform.get(); } |
| |
| private: |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| GrDisplacementMapEffect(SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, |
| sk_sp<GrTextureProxy> displacement, const SkMatrix& offsetMatrix, |
| sk_sp<GrTextureProxy> color, sk_sp<GrColorSpaceXform> colorSpaceXform, |
| const SkISize& colorDimensions); |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| GrCoordTransform fDisplacementTransform; |
| TextureSampler fDisplacementSampler; |
| GrCoordTransform fColorTransform; |
| GrTextureDomain fDomain; |
| TextureSampler fColorSampler; |
| sk_sp<GrColorSpaceXform> fColorSpaceXform; |
| 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); |
| // Creation of the displacement map should happen in a non-colorspace aware context. This |
| // texture is a purely mathematical construct, so we want to just operate on the stored |
| // values. Consider: |
| // User supplies an sRGB displacement map. If we're rendering to a wider gamut, then we could |
| // end up filtering the displacement map into that gamut, which has the effect of reducing |
| // the amount of displacement that it represents (as encoded values move away from the |
| // primaries). |
| // With a more complex DAG attached to this input, it's not clear that working in ANY specific |
| // color space makes sense, so we ignore color spaces (and gamma) entirely. This may not be |
| // ideal, but it's at least consistent and predictable. |
| Context displContext(ctx.ctm(), ctx.clipBounds(), ctx.cache(), OutputProperties(nullptr)); |
| sk_sp<SkSpecialImage> displ(this->filterInput(0, source, displContext, &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<GrTextureProxy> colorProxy(color->asTextureProxyRef(context)); |
| sk_sp<GrTextureProxy> displProxy(displ->asTextureProxyRef(context)); |
| if (!colorProxy || !displProxy) { |
| return nullptr; |
| } |
| |
| SkMatrix offsetMatrix = SkMatrix::MakeTrans(SkIntToScalar(colorOffset.fX - displOffset.fX), |
| SkIntToScalar(colorOffset.fY - displOffset.fY)); |
| SkColorSpace* colorSpace = ctx.outputProperties().colorSpace(); |
| sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(color->getColorSpace(), |
| colorSpace); |
| GrPaint paint; |
| paint.addColorFragmentProcessor( |
| GrDisplacementMapEffect::Make(fXChannelSelector, |
| fYChannelSelector, |
| scale, |
| std::move(displProxy), |
| offsetMatrix, |
| std::move(colorProxy), |
| std::move(colorSpaceXform), |
| SkISize::Make(color->width(), color->height()))); |
| paint.setPorterDuffXPFactory(SkBlendMode::kSrc); |
| SkMatrix matrix; |
| matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y())); |
| |
| sk_sp<GrRenderTargetContext> renderTargetContext( |
| context->makeDeferredRenderTargetContext(SkBackingFit::kApprox, |
| bounds.width(), bounds.height(), |
| GrRenderableConfigForColorSpace(colorSpace), |
| sk_ref_sp(colorSpace))); |
| if (!renderTargetContext) { |
| return nullptr; |
| } |
| paint.setGammaCorrect(renderTargetContext->isGammaCorrect()); |
| |
| renderTargetContext->drawRect(GrNoClip(), std::move(paint), GrAA::kNo, matrix, |
| SkRect::Make(colorBounds)); |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| return SkSpecialImage::MakeDeferredFromGpu( |
| context, |
| SkIRect::MakeWH(bounds.width(), bounds.height()), |
| kNeedNewImageUniqueID_SpecialImage, |
| renderTargetContext->asTextureProxyRef(), |
| renderTargetContext->refColorSpace()); |
| } |
| #endif |
| |
| SkBitmap colorBM, displBM; |
| |
| if (!color->getROPixels(&colorBM) || !displ->getROPixels(&displBM)) { |
| return nullptr; |
| } |
| |
| if ((colorBM.colorType() != kN32_SkColorType) || |
| (displBM.colorType() != kN32_SkColorType)) { |
| return nullptr; |
| } |
| |
| 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; |
| } |
| |
| computeDisplacement(Extractor(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); |
| } |
| |
| sk_sp<SkImageFilter> SkDisplacementMapEffect::onMakeColorSpace(SkColorSpaceXformer* xformer) const { |
| SkASSERT(2 == this->countInputs()); |
| // Intentionally avoid xforming the displacement filter. The values will be used as |
| // offsets, not as colors. |
| sk_sp<SkImageFilter> displacement = sk_ref_sp(const_cast<SkImageFilter*>(this->getInput(0))); |
| sk_sp<SkImageFilter> color = xformer->apply(this->getInput(1)); |
| |
| if (color.get() != this->getInput(1)) { |
| return SkDisplacementMapEffect::Make(fXChannelSelector, fYChannelSelector, fScale, |
| std::move(displacement), std::move(color), |
| this->getCropRectIfSet()); |
| } |
| return this->refMe(); |
| } |
| |
| 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 GrShaderCaps&, GrProcessorKeyBuilder*); |
| |
| protected: |
| void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; |
| |
| private: |
| typedef GrGLSLProgramDataManager::UniformHandle UniformHandle; |
| |
| UniformHandle fScaleUni; |
| GrGLSLColorSpaceXformHelper fColorSpaceHelper; |
| GrTextureDomain::GLDomain fGLDomain; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrGLSLFragmentProcessor* GrDisplacementMapEffect::onCreateGLSLInstance() const { |
| return new GrGLDisplacementMapEffect; |
| } |
| |
| void GrDisplacementMapEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDisplacementMapEffect::GenKey(*this, caps, b); |
| } |
| |
| GrDisplacementMapEffect::GrDisplacementMapEffect( |
| SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, |
| SkDisplacementMapEffect::ChannelSelectorType yChannelSelector, |
| const SkVector& scale, |
| sk_sp<GrTextureProxy> displacement, |
| const SkMatrix& offsetMatrix, |
| sk_sp<GrTextureProxy> color, |
| sk_sp<GrColorSpaceXform> colorSpaceXform, |
| const SkISize& colorDimensions) |
| : INHERITED(GrPixelConfigIsOpaque(color->config()) ? kPreservesOpaqueInput_OptimizationFlag |
| : kNone_OptimizationFlags) |
| , fDisplacementTransform(offsetMatrix, displacement.get()) |
| , fDisplacementSampler(displacement) |
| , fColorTransform(color.get()) |
| , fDomain(color.get(), GrTextureDomain::MakeTexelDomain(SkIRect::MakeSize(colorDimensions)), |
| GrTextureDomain::kDecal_Mode) |
| , fColorSampler(color) |
| , fColorSpaceXform(std::move(colorSpaceXform)) |
| , fXChannelSelector(xChannelSelector) |
| , fYChannelSelector(yChannelSelector) |
| , fScale(scale) { |
| this->initClassID<GrDisplacementMapEffect>(); |
| this->addCoordTransform(&fDisplacementTransform); |
| this->addTextureSampler(&fDisplacementSampler); |
| this->addCoordTransform(&fColorTransform); |
| this->addTextureSampler(&fColorSampler); |
| } |
| |
| 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; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrDisplacementMapEffect); |
| |
| #if GR_TEST_UTILS |
| sk_sp<GrFragmentProcessor> GrDisplacementMapEffect::TestCreate(GrProcessorTestData* d) { |
| int texIdxDispl = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| int texIdxColor = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| sk_sp<GrTextureProxy> dispProxy = d->textureProxy(texIdxDispl); |
| sk_sp<GrTextureProxy> colorProxy = d->textureProxy(texIdxColor); |
| 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, colorProxy->width()); |
| colorDimensions.fHeight = d->fRandom->nextRangeU(0, colorProxy->height()); |
| auto colorSpaceXform = GrTest::TestColorXform(d->fRandom); |
| return GrDisplacementMapEffect::Make(xChannelSelector, yChannelSelector, scale, |
| std::move(dispProxy), SkMatrix::I(), |
| std::move(colorProxy), colorSpaceXform, |
| colorDimensions); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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. |
| |
| fColorSpaceHelper.emitCode(args.fUniformHandler, displacementMap.colorSpaceXform()); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| fragBuilder->codeAppendf("\t\tvec4 %s = ", dColor); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fTransformedCoords[0].c_str(), |
| args.fTransformedCoords[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->ensureCoords2D(args.fTransformedCoords[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.fShaderCaps, |
| domain, |
| args.fOutputColor, |
| SkString(cCoords), |
| args.fTexSamplers[1], |
| nullptr, |
| &fColorSpaceHelper); |
| fragBuilder->codeAppend(";\n"); |
| } |
| |
| void GrGLDisplacementMapEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
| const GrFragmentProcessor& proc) { |
| const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| GrTexture* colorTex = displacementMap.textureSampler(1).peekTexture(); |
| |
| 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); |
| if (SkToBool(displacementMap.colorSpaceXform())) { |
| fColorSpaceHelper.setData(pdman, displacementMap.colorSpaceXform()); |
| } |
| } |
| |
| void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc, |
| const GrShaderCaps&, GrProcessorKeyBuilder* b) { |
| const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| |
| uint32_t xKey = displacementMap.xChannelSelector(); |
| uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits; |
| |
| b->add32(xKey | yKey); |
| b->add32(GrColorSpaceXform::XformKey(displacementMap.colorSpaceXform())); |
| } |
| #endif |
