69 lines
3.3 KiB
C++
69 lines
3.3 KiB
C++
/*
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* Copyright 2020 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/effects/SkImageFilters.h"
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#include "modules/svg/include/SkSVGAttributeParser.h"
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#include "modules/svg/include/SkSVGFeDisplacementMap.h"
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#include "modules/svg/include/SkSVGFilterContext.h"
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#include "modules/svg/include/SkSVGRenderContext.h"
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#include "modules/svg/include/SkSVGValue.h"
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bool SkSVGFeDisplacementMap::parseAndSetAttribute(const char* name, const char* value) {
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return INHERITED::parseAndSetAttribute(name, value) ||
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this->setIn2(SkSVGAttributeParser::parse<SkSVGFeInputType>("in2", name, value)) ||
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this->setXChannelSelector(
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SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
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"xChannelSelector", name, value)) ||
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this->setYChannelSelector(
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SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
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"yChannelSelector", name, value)) ||
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this->setScale(SkSVGAttributeParser::parse<SkSVGNumberType>("scale", name, value));
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}
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sk_sp<SkImageFilter> SkSVGFeDisplacementMap::onMakeImageFilter(
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const SkSVGRenderContext& ctx, const SkSVGFilterContext& fctx) const {
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const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
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const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
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// According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
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// the 'in' source image must remain in its current colorspace.
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sk_sp<SkImageFilter> in = fctx.resolveInput(ctx, this->getIn());
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sk_sp<SkImageFilter> in2 = fctx.resolveInput(ctx, this->getIn2(), colorspace);
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SkScalar scale = fScale;
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if (fctx.primitiveUnits().type() == SkSVGObjectBoundingBoxUnits::Type::kObjectBoundingBox) {
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const auto obbt = ctx.transformForCurrentOBB(fctx.primitiveUnits());
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scale = SkSVGLengthContext({obbt.scale.x, obbt.scale.y})
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.resolve(SkSVGLength(scale, SkSVGLength::Unit::kPercentage),
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SkSVGLengthContext::LengthType::kOther);
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}
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return SkImageFilters::DisplacementMap(
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fXChannelSelector, fYChannelSelector, scale, in2, in, cropRect);
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}
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SkSVGColorspace SkSVGFeDisplacementMap::resolveColorspace(const SkSVGRenderContext& ctx,
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const SkSVGFilterContext& fctx) const {
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// According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
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// the 'in' source image must remain in its current colorspace, which means the colorspace of
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// this FE node is the same as the input.
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return fctx.resolveInputColorspace(ctx, this->getIn());
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}
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template <>
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bool SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
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SkSVGFeDisplacementMap::ChannelSelector* channel) {
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static constexpr std::tuple<const char*, SkSVGFeDisplacementMap::ChannelSelector> gMap[] = {
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{ "R", SkSVGFeDisplacementMap::ChannelSelector::kR },
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{ "G", SkSVGFeDisplacementMap::ChannelSelector::kG },
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{ "B", SkSVGFeDisplacementMap::ChannelSelector::kB },
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{ "A", SkSVGFeDisplacementMap::ChannelSelector::kA },
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};
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return this->parseEnumMap(gMap, channel) && this->parseEOSToken();
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}
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