blob: 9698a55ce539b8ee3e660ffdceadfa5d2e50730c [file] [log] [blame]
/*
* Copyright 2020 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/SkImageFilters.h"
#include "modules/svg/include/SkSVGAttributeParser.h"
#include "modules/svg/include/SkSVGFeDisplacementMap.h"
#include "modules/svg/include/SkSVGFilterContext.h"
#include "modules/svg/include/SkSVGRenderContext.h"
#include "modules/svg/include/SkSVGValue.h"
bool SkSVGFeDisplacementMap::parseAndSetAttribute(const char* name, const char* value) {
return INHERITED::parseAndSetAttribute(name, value) ||
this->setIn2(SkSVGAttributeParser::parse<SkSVGFeInputType>("in2", name, value)) ||
this->setXChannelSelector(
SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
"xChannelSelector", name, value)) ||
this->setYChannelSelector(
SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
"yChannelSelector", name, value)) ||
this->setScale(SkSVGAttributeParser::parse<SkSVGNumberType>("scale", name, value));
}
sk_sp<SkImageFilter> SkSVGFeDisplacementMap::onMakeImageFilter(
const SkSVGRenderContext& ctx, const SkSVGFilterContext& fctx) const {
const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
// According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
// the 'in' source image must remain in its current colorspace.
sk_sp<SkImageFilter> in = fctx.resolveInput(ctx, this->getIn());
sk_sp<SkImageFilter> in2 = fctx.resolveInput(ctx, this->getIn2(), colorspace);
SkScalar scale = fScale;
if (fctx.primitiveUnits().type() == SkSVGObjectBoundingBoxUnits::Type::kObjectBoundingBox) {
const auto obbt = ctx.transformForCurrentOBB(fctx.primitiveUnits());
scale = SkSVGLengthContext({obbt.scale.x, obbt.scale.y})
.resolve(SkSVGLength(scale, SkSVGLength::Unit::kPercentage),
SkSVGLengthContext::LengthType::kOther);
}
return SkImageFilters::DisplacementMap(
fXChannelSelector, fYChannelSelector, scale, in2, in, cropRect);
}
SkSVGColorspace SkSVGFeDisplacementMap::resolveColorspace(const SkSVGRenderContext& ctx,
const SkSVGFilterContext& fctx) const {
// According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
// the 'in' source image must remain in its current colorspace, which means the colorspace of
// this FE node is the same as the input.
return fctx.resolveInputColorspace(ctx, this->getIn());
}
template <>
bool SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
SkSVGFeDisplacementMap::ChannelSelector* channel) {
static constexpr std::tuple<const char*, SkSVGFeDisplacementMap::ChannelSelector> gMap[] = {
{ "R", SkSVGFeDisplacementMap::ChannelSelector::kR },
{ "G", SkSVGFeDisplacementMap::ChannelSelector::kG },
{ "B", SkSVGFeDisplacementMap::ChannelSelector::kB },
{ "A", SkSVGFeDisplacementMap::ChannelSelector::kA },
};
return this->parseEnumMap(gMap, channel) && this->parseEOSToken();
}