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 #include "modules/svg/include/SkSVGFeComposite.h"
9
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkImageFilter.h"
12 #include "include/core/SkRect.h"
13 #include "include/effects/SkImageFilters.h"
14 #include "include/private/base/SkAssert.h"
15 #include "modules/svg/include/SkSVGAttributeParser.h"
16 #include "modules/svg/include/SkSVGFilterContext.h"
17
18 #include <tuple>
19
20 class SkSVGRenderContext;
21
parseAndSetAttribute(const char * name,const char * value)22 bool SkSVGFeComposite::parseAndSetAttribute(const char* name, const char* value) {
23 return INHERITED::parseAndSetAttribute(name, value) ||
24 // SkSVGFeInputType parsing defined in SkSVGFe.cpp:
25 this->setIn2(SkSVGAttributeParser::parse<SkSVGFeInputType>("in2", name, value)) ||
26 this->setK1(SkSVGAttributeParser::parse<SkSVGNumberType>("k1", name, value)) ||
27 this->setK2(SkSVGAttributeParser::parse<SkSVGNumberType>("k2", name, value)) ||
28 this->setK3(SkSVGAttributeParser::parse<SkSVGNumberType>("k3", name, value)) ||
29 this->setK4(SkSVGAttributeParser::parse<SkSVGNumberType>("k4", name, value)) ||
30 this->setOperator(
31 SkSVGAttributeParser::parse<SkSVGFeCompositeOperator>("operator", name, value));
32 }
33
BlendModeForOperator(SkSVGFeCompositeOperator op)34 SkBlendMode SkSVGFeComposite::BlendModeForOperator(SkSVGFeCompositeOperator op) {
35 switch (op) {
36 case SkSVGFeCompositeOperator::kOver:
37 return SkBlendMode::kSrcOver;
38 case SkSVGFeCompositeOperator::kIn:
39 return SkBlendMode::kSrcIn;
40 case SkSVGFeCompositeOperator::kOut:
41 return SkBlendMode::kSrcOut;
42 case SkSVGFeCompositeOperator::kAtop:
43 return SkBlendMode::kSrcATop;
44 case SkSVGFeCompositeOperator::kXor:
45 return SkBlendMode::kXor;
46 case SkSVGFeCompositeOperator::kArithmetic:
47 // Arithmetic is not handled with a blend
48 SkASSERT(false);
49 return SkBlendMode::kSrcOver;
50 }
51
52 SkUNREACHABLE;
53 }
54
onMakeImageFilter(const SkSVGRenderContext & ctx,const SkSVGFilterContext & fctx) const55 sk_sp<SkImageFilter> SkSVGFeComposite::onMakeImageFilter(const SkSVGRenderContext& ctx,
56 const SkSVGFilterContext& fctx) const {
57 const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
58 const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
59 const sk_sp<SkImageFilter> background = fctx.resolveInput(ctx, fIn2, colorspace);
60 const sk_sp<SkImageFilter> foreground = fctx.resolveInput(ctx, this->getIn(), colorspace);
61 if (fOperator == SkSVGFeCompositeOperator::kArithmetic) {
62 constexpr bool enforcePMColor = true;
63 return SkImageFilters::Arithmetic(
64 fK1, fK2, fK3, fK4, enforcePMColor, background, foreground, cropRect);
65 } else {
66 return SkImageFilters::Blend(
67 BlendModeForOperator(fOperator), background, foreground, cropRect);
68 }
69 }
70
parse(SkSVGFeCompositeOperator * op)71 template <> bool SkSVGAttributeParser::parse(SkSVGFeCompositeOperator* op) {
72 static constexpr std::tuple<const char*, SkSVGFeCompositeOperator> gOpMap[] = {
73 {"over", SkSVGFeCompositeOperator::kOver},
74 {"in", SkSVGFeCompositeOperator::kIn},
75 {"out", SkSVGFeCompositeOperator::kOut},
76 {"atop", SkSVGFeCompositeOperator::kAtop},
77 {"xor", SkSVGFeCompositeOperator::kXor},
78 {"arithmetic", SkSVGFeCompositeOperator::kArithmetic},
79 };
80
81 return this->parseEnumMap(gOpMap, op) && this->parseEOSToken();
82 }
83