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/SkSVGFeBlend.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 SkSVGFeBlend::parseAndSetAttribute(const char* name, const char* value) {
23 return INHERITED::parseAndSetAttribute(name, value) ||
24 this->setIn2(SkSVGAttributeParser::parse<SkSVGFeInputType>("in2", name, value)) ||
25 this->setMode(SkSVGAttributeParser::parse<SkSVGFeBlend::Mode>("mode", name, value));
26 }
27
GetBlendMode(SkSVGFeBlend::Mode mode)28 static SkBlendMode GetBlendMode(SkSVGFeBlend::Mode mode) {
29 switch (mode) {
30 case SkSVGFeBlend::Mode::kNormal:
31 return SkBlendMode::kSrcOver;
32 case SkSVGFeBlend::Mode::kMultiply:
33 return SkBlendMode::kMultiply;
34 case SkSVGFeBlend::Mode::kScreen:
35 return SkBlendMode::kScreen;
36 case SkSVGFeBlend::Mode::kDarken:
37 return SkBlendMode::kDarken;
38 case SkSVGFeBlend::Mode::kLighten:
39 return SkBlendMode::kLighten;
40 }
41
42 SkUNREACHABLE;
43 }
44
onMakeImageFilter(const SkSVGRenderContext & ctx,const SkSVGFilterContext & fctx) const45 sk_sp<SkImageFilter> SkSVGFeBlend::onMakeImageFilter(const SkSVGRenderContext& ctx,
46 const SkSVGFilterContext& fctx) const {
47 const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
48 const SkBlendMode blendMode = GetBlendMode(this->getMode());
49 const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
50 const sk_sp<SkImageFilter> background = fctx.resolveInput(ctx, fIn2, colorspace);
51 const sk_sp<SkImageFilter> foreground = fctx.resolveInput(ctx, this->getIn(), colorspace);
52 return SkImageFilters::Blend(blendMode, background, foreground, cropRect);
53 }
54
55 template <>
parse(SkSVGFeBlend::Mode * mode)56 bool SkSVGAttributeParser::parse<SkSVGFeBlend::Mode>(
57 SkSVGFeBlend::Mode* mode) {
58 static constexpr std::tuple<const char*, SkSVGFeBlend::Mode> gMap[] = {
59 { "normal" , SkSVGFeBlend::Mode::kNormal },
60 { "multiply", SkSVGFeBlend::Mode::kMultiply },
61 { "screen" , SkSVGFeBlend::Mode::kScreen },
62 { "darken" , SkSVGFeBlend::Mode::kDarken },
63 { "lighten" , SkSVGFeBlend::Mode::kLighten },
64 };
65
66 return this->parseEnumMap(gMap, mode) && this->parseEOSToken();
67 }
68