1/* 2 * Copyright 2020 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#ifndef SkSVGFe_DEFINED 9#define SkSVGFe_DEFINED 10 11#include <vector> 12 13#include "modules/svg/include/SkSVGHiddenContainer.h" 14 15class SkImageFilter; 16class SkSVGFilterContext; 17 18class SkSVGFe : public SkSVGHiddenContainer { 19public: 20 static bool IsFilterEffect(const sk_sp<SkSVGNode>& node) { 21 switch (node->tag()) { 22 case SkSVGTag::kFeBlend: 23 case SkSVGTag::kFeColorMatrix: 24 case SkSVGTag::kFeComposite: 25 case SkSVGTag::kFeDiffuseLighting: 26 case SkSVGTag::kFeDisplacementMap: 27 case SkSVGTag::kFeFlood: 28 case SkSVGTag::kFeGaussianBlur: 29 case SkSVGTag::kFeImage: 30 case SkSVGTag::kFeMorphology: 31 case SkSVGTag::kFeOffset: 32 case SkSVGTag::kFeSpecularLighting: 33 case SkSVGTag::kFeTurbulence: 34 return true; 35 default: 36 return false; 37 } 38 } 39 40 sk_sp<SkImageFilter> makeImageFilter(const SkSVGRenderContext& ctx, 41 const SkSVGFilterContext& fctx) const; 42 43 // https://www.w3.org/TR/SVG11/filters.html#FilterPrimitiveSubRegion 44 SkRect resolveFilterSubregion(const SkSVGRenderContext&, const SkSVGFilterContext&) const; 45 46 /** 47 * Resolves the colorspace within which this filter effect should be applied. 48 * Spec: https://www.w3.org/TR/SVG11/painting.html#ColorInterpolationProperties 49 * 'color-interpolation-filters' property. 50 */ 51 virtual SkSVGColorspace resolveColorspace(const SkSVGRenderContext&, 52 const SkSVGFilterContext&) const; 53 54 /** Propagates any inherited presentation attributes in the given context. */ 55 void applyProperties(SkSVGRenderContext*) const; 56 57 SVG_ATTR(In, SkSVGFeInputType, SkSVGFeInputType()) 58 SVG_ATTR(Result, SkSVGStringType, SkSVGStringType()) 59 SVG_OPTIONAL_ATTR(X, SkSVGLength) 60 SVG_OPTIONAL_ATTR(Y, SkSVGLength) 61 SVG_OPTIONAL_ATTR(Width, SkSVGLength) 62 SVG_OPTIONAL_ATTR(Height, SkSVGLength) 63 64protected: 65 explicit SkSVGFe(SkSVGTag t) : INHERITED(t) {} 66 67 virtual sk_sp<SkImageFilter> onMakeImageFilter(const SkSVGRenderContext&, 68 const SkSVGFilterContext&) const = 0; 69 70 virtual std::vector<SkSVGFeInputType> getInputs() const = 0; 71 72 bool parseAndSetAttribute(const char*, const char*) override; 73 74private: 75 /** 76 * Resolves the rect specified by the x, y, width and height attributes (if specified) on this 77 * filter effect. These attributes are resolved according to the given length context and 78 * the value of 'primitiveUnits' on the parent <filter> element. 79 */ 80 SkRect resolveBoundaries(const SkSVGRenderContext&, const SkSVGFilterContext&) const; 81 82 using INHERITED = SkSVGHiddenContainer; 83}; 84 85#endif // SkSVGFe_DEFINED 86