| /* |
| * 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 "include/effects/SkDisplacementMapEffect.h" |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkUnPreMultiply.h" |
| #include "include/private/SkColorData.h" |
| #include "src/core/SkImageFilter_Base.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSpecialImage.h" |
| #include "src/core/SkWriteBuffer.h" |
| #if SK_SUPPORT_GPU |
| #include "include/private/GrRecordingContext.h" |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrColorSpaceXform.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/gpu/GrRenderTargetContext.h" |
| #include "src/gpu/GrTexture.h" |
| #include "src/gpu/GrTextureProxy.h" |
| #include "src/gpu/SkGr.h" |
| #include "src/gpu/glsl/GrGLSLFragmentProcessor.h" |
| #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/glsl/GrGLSLProgramDataManager.h" |
| #include "src/gpu/glsl/GrGLSLUniformHandler.h" |
| #endif |
| |
| namespace { |
| |
| class SkDisplacementMapEffectImpl final : public SkImageFilter_Base { |
| public: |
| SkDisplacementMapEffectImpl(SkColorChannel xChannelSelector, SkColorChannel yChannelSelector, |
| SkScalar scale, sk_sp<SkImageFilter> inputs[2], |
| const CropRect* cropRect) |
| : INHERITED(inputs, 2, cropRect) |
| , fXChannelSelector(xChannelSelector) |
| , fYChannelSelector(yChannelSelector) |
| , fScale(scale) {} |
| |
| SkRect computeFastBounds(const SkRect& src) const override; |
| |
| virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| MapDirection, const SkIRect* inputRect) const override; |
| SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix& ctm, |
| MapDirection, const SkIRect* inputRect) const override; |
| |
| protected: |
| sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override; |
| |
| void flatten(SkWriteBuffer&) const override; |
| |
| private: |
| friend void SkDisplacementMapEffect::RegisterFlattenables(); |
| SK_FLATTENABLE_HOOKS(SkDisplacementMapEffectImpl) |
| |
| SkColorChannel fXChannelSelector; |
| SkColorChannel fYChannelSelector; |
| SkScalar fScale; |
| |
| const SkImageFilter* getDisplacementInput() const { return getInput(0); } |
| const SkImageFilter* getColorInput() const { return getInput(1); } |
| |
| typedef SkImageFilter_Base INHERITED; |
| }; |
| |
| // Shift values to extract channels from an SkColor (SkColorGetR, SkColorGetG, etc) |
| const uint8_t gChannelTypeToShift[] = { |
| 16, // R |
| 8, // G |
| 0, // B |
| 24, // A |
| }; |
| struct Extractor { |
| Extractor(SkColorChannel typeX, |
| SkColorChannel typeY) |
| : fShiftX(gChannelTypeToShift[static_cast<int>(typeX)]) |
| , fShiftY(gChannelTypeToShift[static_cast<int>(typeY)]) |
| {} |
| |
| unsigned fShiftX, fShiftY; |
| |
| unsigned getX(SkColor c) const { return (c >> fShiftX) & 0xFF; } |
| unsigned getY(SkColor c) const { return (c >> fShiftY) & 0xFF; } |
| }; |
| |
| static bool channel_selector_type_is_valid(SkColorChannel cst) { |
| switch (cst) { |
| case SkColorChannel::kR: |
| case SkColorChannel::kG: |
| case SkColorChannel::kB: |
| case SkColorChannel::kA: |
| return true; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| static SkColorChannel convert_channel_type(SkDisplacementMapEffect::ChannelSelectorType c) { |
| switch(c) { |
| case SkDisplacementMapEffect::kR_ChannelSelectorType: |
| return SkColorChannel::kR; |
| case SkDisplacementMapEffect::kG_ChannelSelectorType: |
| return SkColorChannel::kG; |
| case SkDisplacementMapEffect::kB_ChannelSelectorType: |
| return SkColorChannel::kB; |
| case SkDisplacementMapEffect::kA_ChannelSelectorType: |
| return SkColorChannel::kA; |
| case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
| default: |
| // Raster backend historically treated this as B, GPU backend would fail when generating |
| // shader code. Just return B without aborting in debug-builds in order to keep fuzzers |
| // happy when they pass in the technically still valid kUnknown_ChannelSelectorType. |
| return SkColorChannel::kB; |
| } |
| } |
| |
| } // anonymous namespace |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkImageFilter> SkDisplacementMapEffect::Make(ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, |
| SkScalar scale, |
| sk_sp<SkImageFilter> displacement, |
| sk_sp<SkImageFilter> color, |
| const SkImageFilter::CropRect* cropRect) { |
| return Make(convert_channel_type(xChannelSelector), convert_channel_type(yChannelSelector), |
| scale, std::move(displacement), std::move(color), cropRect); |
| } |
| |
| sk_sp<SkImageFilter> SkDisplacementMapEffect::Make(SkColorChannel xChannelSelector, |
| SkColorChannel yChannelSelector, |
| SkScalar scale, |
| sk_sp<SkImageFilter> displacement, |
| sk_sp<SkImageFilter> color, |
| const SkImageFilter::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 SkDisplacementMapEffectImpl(xChannelSelector, yChannelSelector, |
| scale, inputs, cropRect)); |
| } |
| |
| void SkDisplacementMapEffect::RegisterFlattenables() { |
| SK_REGISTER_FLATTENABLE(SkDisplacementMapEffectImpl); |
| // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
| SkFlattenable::Register("SkDisplacementMapEffect", SkDisplacementMapEffectImpl::CreateProc); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkFlattenable> SkDisplacementMapEffectImpl::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2); |
| |
| SkColorChannel xsel, ysel; |
| if (buffer.isVersionLT(SkPicturePriv::kCleanupImageFilterEnums_Version)) { |
| xsel = convert_channel_type(buffer.read32LE( |
| SkDisplacementMapEffect::kLast_ChannelSelectorType)); |
| ysel = convert_channel_type(buffer.read32LE( |
| SkDisplacementMapEffect::kLast_ChannelSelectorType)); |
| } else { |
| xsel = buffer.read32LE(SkColorChannel::kLastEnum); |
| ysel = buffer.read32LE(SkColorChannel::kLastEnum); |
| } |
| |
| SkScalar scale = buffer.readScalar(); |
| |
| return SkDisplacementMapEffect::Make(xsel, ysel, scale, common.getInput(0), common.getInput(1), |
| &common.cropRect()); |
| } |
| |
| void SkDisplacementMapEffectImpl::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeInt((int) fXChannelSelector); |
| buffer.writeInt((int) fYChannelSelector); |
| buffer.writeScalar(fScale); |
| } |
| |
| #if SK_SUPPORT_GPU |
| |
| namespace { |
| |
| class GrDisplacementMapEffect : public GrFragmentProcessor { |
| public: |
| static std::unique_ptr<GrFragmentProcessor> Make(SkColorChannel xChannelSelector, |
| SkColorChannel yChannelSelector, |
| SkVector scale, |
| GrSurfaceProxyView displacement, |
| const SkIRect& displSubset, |
| const SkMatrix& offsetMatrix, |
| GrSurfaceProxyView color, |
| const SkIRect& colorSubset, |
| const GrCaps&); |
| |
| ~GrDisplacementMapEffect() override; |
| |
| SkColorChannel xChannelSelector() const { return fXChannelSelector; } |
| SkColorChannel yChannelSelector() const { return fYChannelSelector; } |
| const SkVector& scale() const { return fScale; } |
| |
| const char* name() const override { return "DisplacementMap"; } |
| |
| std::unique_ptr<GrFragmentProcessor> clone() const override; |
| |
| private: |
| class Impl; |
| |
| explicit GrDisplacementMapEffect(const GrDisplacementMapEffect&); |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| GrDisplacementMapEffect(SkColorChannel xChannelSelector, |
| SkColorChannel yChannelSelector, |
| const SkVector& scale, |
| std::unique_ptr<GrFragmentProcessor> displacement, |
| std::unique_ptr<GrFragmentProcessor> color); |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| SkColorChannel fXChannelSelector; |
| SkColorChannel fYChannelSelector; |
| SkVector fScale; |
| |
| typedef GrFragmentProcessor INHERITED; |
| }; |
| |
| } // anonymous namespace |
| #endif |
| |
| static void compute_displacement(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) { |
| SkColor c = SkUnPreMultiply::PMColorToColor(*displPtr); |
| |
| SkScalar displX = scaleForColor.fX * ex.getX(c) + scaleAdj.fX; |
| SkScalar displY = scaleForColor.fY * ex.getY(c) + scaleAdj.fY; |
| // Truncate the displacement values |
| const int32_t srcX = Sk32_sat_add(x, SkScalarTruncToInt(displX)); |
| const int32_t srcY = Sk32_sat_add(y, SkScalarTruncToInt(displY)); |
| *dstPtr++ = ((srcX < 0) || (srcX >= srcW) || (srcY < 0) || (srcY >= srcH)) ? |
| 0 : *(src.getAddr32(srcX, srcY)); |
| } |
| } |
| } |
| |
| sk_sp<SkSpecialImage> SkDisplacementMapEffectImpl::onFilterImage(const Context& ctx, |
| SkIPoint* offset) const { |
| SkIPoint colorOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> color(this->filterInput(1, 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.mapping(), ctx.desiredOutput(), ctx.cache(), |
| kN32_SkColorType, nullptr, ctx.source()); |
| sk_sp<SkSpecialImage> displ(this->filterInput(0, 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->applyCropRectAndPad(ctx, displ.get(), &displOffset, &displBounds); |
| if (!displ) { |
| return nullptr; |
| } |
| |
| if (!bounds.intersect(displBounds)) { |
| return nullptr; |
| } |
| |
| const SkIRect colorBounds = bounds.makeOffset(-colorOffset); |
| // If the offset overflowed (saturated) then we have to abort, as we need their |
| // dimensions to be equal. See https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7209 |
| if (colorBounds.size() != bounds.size()) { |
| return nullptr; |
| } |
| |
| SkVector scale = SkVector::Make(fScale, fScale); |
| ctx.ctm().mapVectors(&scale, 1); |
| |
| #if SK_SUPPORT_GPU |
| if (ctx.gpuBacked()) { |
| auto context = ctx.getContext(); |
| |
| GrSurfaceProxyView colorView = color->view(context); |
| GrSurfaceProxyView displView = displ->view(context); |
| if (!colorView.proxy() || !displView.proxy()) { |
| return nullptr; |
| } |
| const auto isProtected = colorView.proxy()->isProtected(); |
| |
| SkMatrix offsetMatrix = SkMatrix::Translate(SkIntToScalar(colorOffset.fX - displOffset.fX), |
| SkIntToScalar(colorOffset.fY - displOffset.fY)); |
| |
| std::unique_ptr<GrFragmentProcessor> fp = |
| GrDisplacementMapEffect::Make(fXChannelSelector, |
| fYChannelSelector, |
| scale, |
| std::move(displView), |
| displ->subset(), |
| offsetMatrix, |
| std::move(colorView), |
| color->subset(), |
| *context->priv().caps()); |
| fp = GrColorSpaceXformEffect::Make(std::move(fp), |
| color->getColorSpace(), color->alphaType(), |
| ctx.colorSpace(), kPremul_SkAlphaType); |
| |
| GrPaint paint; |
| paint.addColorFragmentProcessor(std::move(fp)); |
| paint.setPorterDuffXPFactory(SkBlendMode::kSrc); |
| SkMatrix matrix; |
| matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y())); |
| |
| auto renderTargetContext = GrRenderTargetContext::Make( |
| context, ctx.grColorType(), ctx.refColorSpace(), SkBackingFit::kApprox, |
| bounds.size(), 1, GrMipMapped::kNo, isProtected, kBottomLeft_GrSurfaceOrigin); |
| if (!renderTargetContext) { |
| return nullptr; |
| } |
| |
| renderTargetContext->drawRect(nullptr, 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->readSurfaceView(), |
| renderTargetContext->colorInfo().colorType(), |
| renderTargetContext->colorInfo().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; |
| } |
| |
| compute_displacement(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); |
| } |
| |
| SkRect SkDisplacementMapEffectImpl::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 SkDisplacementMapEffectImpl::onFilterNodeBounds( |
| const SkIRect& src, const SkMatrix& ctm, MapDirection, const SkIRect* inputRect) 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 SkDisplacementMapEffectImpl::onFilterBounds( |
| const SkIRect& src, const SkMatrix& ctm, MapDirection dir, const SkIRect* inputRect) const { |
| // Recurse only into color input. |
| if (this->getColorInput()) { |
| return this->getColorInput()->filterBounds(src, ctm, dir, inputRect); |
| } |
| return src; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| class GrDisplacementMapEffect::Impl : 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; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| std::unique_ptr<GrFragmentProcessor> GrDisplacementMapEffect::Make(SkColorChannel xChannelSelector, |
| SkColorChannel yChannelSelector, |
| SkVector scale, |
| GrSurfaceProxyView displacement, |
| const SkIRect& displSubset, |
| const SkMatrix& offsetMatrix, |
| GrSurfaceProxyView color, |
| const SkIRect& colorSubset, |
| const GrCaps& caps) { |
| static constexpr GrSamplerState kColorSampler(GrSamplerState::WrapMode::kClampToBorder, |
| GrSamplerState::Filter::kNearest); |
| auto colorEffect = GrTextureEffect::MakeSubset(std::move(color), |
| kPremul_SkAlphaType, |
| SkMatrix::Translate(colorSubset.topLeft()), |
| kColorSampler, |
| SkRect::Make(colorSubset), |
| caps); |
| |
| auto dispM = SkMatrix::Concat(SkMatrix::Translate(displSubset.topLeft()), offsetMatrix); |
| auto dispEffect = GrTextureEffect::Make(std::move(displacement), |
| kPremul_SkAlphaType, |
| dispM, |
| GrSamplerState::Filter::kNearest); |
| |
| return std::unique_ptr<GrFragmentProcessor>( |
| new GrDisplacementMapEffect(xChannelSelector, |
| yChannelSelector, |
| scale, |
| std::move(dispEffect), |
| std::move(colorEffect))); |
| } |
| |
| GrGLSLFragmentProcessor* GrDisplacementMapEffect::onCreateGLSLInstance() const { |
| return new Impl(); |
| } |
| |
| void GrDisplacementMapEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| Impl::GenKey(*this, caps, b); |
| } |
| |
| GrDisplacementMapEffect::GrDisplacementMapEffect(SkColorChannel xChannelSelector, |
| SkColorChannel yChannelSelector, |
| const SkVector& scale, |
| std::unique_ptr<GrFragmentProcessor> displacement, |
| std::unique_ptr<GrFragmentProcessor> color) |
| : INHERITED(kGrDisplacementMapEffect_ClassID, GrFragmentProcessor::kNone_OptimizationFlags) |
| , fXChannelSelector(xChannelSelector) |
| , fYChannelSelector(yChannelSelector) |
| , fScale(scale) { |
| this->registerChild(std::move(displacement)); |
| this->registerExplicitlySampledChild(std::move(color)); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| GrDisplacementMapEffect::GrDisplacementMapEffect(const GrDisplacementMapEffect& that) |
| : INHERITED(kGrDisplacementMapEffect_ClassID, that.optimizationFlags()) |
| , fXChannelSelector(that.fXChannelSelector) |
| , fYChannelSelector(that.fYChannelSelector) |
| , fScale(that.fScale) { |
| this->cloneAndRegisterAllChildProcessors(that); |
| this->setUsesSampleCoordsDirectly(); |
| } |
| |
| GrDisplacementMapEffect::~GrDisplacementMapEffect() {} |
| |
| std::unique_ptr<GrFragmentProcessor> GrDisplacementMapEffect::clone() const { |
| return std::unique_ptr<GrFragmentProcessor>(new GrDisplacementMapEffect(*this)); |
| } |
| |
| 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 |
| std::unique_ptr<GrFragmentProcessor> GrDisplacementMapEffect::TestCreate(GrProcessorTestData* d) { |
| auto [dispView, ct1, at1] = d->randomView(); |
| auto [colorView, ct2, at2] = d->randomView(); |
| static const int kMaxComponent = static_cast<int>(SkColorChannel::kLastEnum); |
| SkColorChannel xChannelSelector = |
| static_cast<SkColorChannel>(d->fRandom->nextRangeU(1, kMaxComponent)); |
| SkColorChannel yChannelSelector = |
| static_cast<SkColorChannel>(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, colorView.width()); |
| colorDimensions.fHeight = d->fRandom->nextRangeU(0, colorView.height()); |
| SkIRect dispRect = SkIRect::MakeSize(dispView.dimensions()); |
| |
| return GrDisplacementMapEffect::Make(xChannelSelector, |
| yChannelSelector, |
| scale, |
| std::move(dispView), |
| dispRect, |
| SkMatrix::I(), |
| std::move(colorView), |
| SkIRect::MakeSize(colorDimensions), |
| *d->caps()); |
| } |
| |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void GrDisplacementMapEffect::Impl::emitCode(EmitArgs& args) { |
| const GrDisplacementMapEffect& displacementMap = args.fFp.cast<GrDisplacementMapEffect>(); |
| |
| fScaleUni = args.fUniformHandler->addUniform(&displacementMap, kFragment_GrShaderFlag, |
| kHalf2_GrSLType, "Scale"); |
| const char* scaleUni = args.fUniformHandler->getUniformCStr(fScaleUni); |
| static constexpr const char* dColor = "dColor"; |
| static constexpr const char* cCoords = "cCoords"; |
| static constexpr 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; |
| auto displacementSample = this->invokeChild(0, args); |
| fragBuilder->codeAppendf("half4 %s = %s;", dColor, displacementSample.c_str()); |
| |
| // Unpremultiply the displacement |
| fragBuilder->codeAppendf("%s.rgb = (%s.a < %s) ? half3(0.0) : saturate(%s.rgb / %s.a);", |
| dColor, dColor, nearZero, dColor, dColor); |
| auto chanChar = [](SkColorChannel c) { |
| switch(c) { |
| case SkColorChannel::kR: return 'r'; |
| case SkColorChannel::kG: return 'g'; |
| case SkColorChannel::kB: return 'b'; |
| case SkColorChannel::kA: return 'a'; |
| default: SkUNREACHABLE; |
| } |
| }; |
| fragBuilder->codeAppendf("float2 %s = %s + %s*(%s.%c%c - half2(0.5));", |
| cCoords, args.fSampleCoord, scaleUni, dColor, |
| chanChar(displacementMap.xChannelSelector()), |
| chanChar(displacementMap.yChannelSelector())); |
| |
| auto colorSample = this->invokeChild(1, args, cCoords); |
| |
| fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, colorSample.c_str()); |
| } |
| |
| void GrDisplacementMapEffect::Impl::onSetData(const GrGLSLProgramDataManager& pdman, |
| const GrFragmentProcessor& proc) { |
| const auto& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| const SkVector& scale = displacementMap.scale(); |
| pdman.set2f(fScaleUni, scale.x(), scale.y()); |
| } |
| |
| void GrDisplacementMapEffect::Impl::GenKey(const GrProcessor& proc, |
| const GrShaderCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
| |
| static constexpr int kChannelSelectorKeyBits = 2; // Max value is 3, so 2 bits are required |
| |
| uint32_t xKey = static_cast<uint32_t>(displacementMap.xChannelSelector()); |
| uint32_t yKey = static_cast<uint32_t>(displacementMap.yChannelSelector()) |
| << kChannelSelectorKeyBits; |
| |
| b->add32(xKey | yKey); |
| } |
| #endif |
