Coverage Report

Created: 2024-05-20 07:14

/src/skia/modules/svg/src/SkSVGFeDisplacementMap.cpp
Line
Count
Source (jump to first uncovered line)
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 "include/effects/SkImageFilters.h"
9
#include "modules/svg/include/SkSVGAttributeParser.h"
10
#include "modules/svg/include/SkSVGFeDisplacementMap.h"
11
#include "modules/svg/include/SkSVGFilterContext.h"
12
#include "modules/svg/include/SkSVGRenderContext.h"
13
#include "modules/svg/include/SkSVGValue.h"
14
15
0
bool SkSVGFeDisplacementMap::parseAndSetAttribute(const char* name, const char* value) {
16
0
    return INHERITED::parseAndSetAttribute(name, value) ||
17
0
           this->setIn2(SkSVGAttributeParser::parse<SkSVGFeInputType>("in2", name, value)) ||
18
0
           this->setXChannelSelector(
19
0
                   SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
20
0
                           "xChannelSelector", name, value)) ||
21
0
           this->setYChannelSelector(
22
0
                   SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
23
0
                           "yChannelSelector", name, value)) ||
24
0
           this->setScale(SkSVGAttributeParser::parse<SkSVGNumberType>("scale", name, value));
25
0
}
26
27
sk_sp<SkImageFilter> SkSVGFeDisplacementMap::onMakeImageFilter(
28
0
        const SkSVGRenderContext& ctx, const SkSVGFilterContext& fctx) const {
29
0
    const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
30
0
    const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
31
32
    // According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
33
    // the 'in' source image must remain in its current colorspace.
34
0
    sk_sp<SkImageFilter> in = fctx.resolveInput(ctx, this->getIn());
35
0
    sk_sp<SkImageFilter> in2 = fctx.resolveInput(ctx, this->getIn2(), colorspace);
36
37
0
    SkScalar scale = fScale;
38
0
    if (fctx.primitiveUnits().type() == SkSVGObjectBoundingBoxUnits::Type::kObjectBoundingBox) {
39
0
        const auto obbt = ctx.transformForCurrentOBB(fctx.primitiveUnits());
40
0
        scale = SkSVGLengthContext({obbt.scale.x, obbt.scale.y})
41
0
                    .resolve(SkSVGLength(scale, SkSVGLength::Unit::kPercentage),
42
0
                             SkSVGLengthContext::LengthType::kOther);
43
0
    }
44
45
0
    return SkImageFilters::DisplacementMap(
46
0
            fXChannelSelector, fYChannelSelector, scale, in2, in, cropRect);
47
0
}
48
49
SkSVGColorspace SkSVGFeDisplacementMap::resolveColorspace(const SkSVGRenderContext& ctx,
50
0
                                                          const SkSVGFilterContext& fctx) const {
51
    // According to spec https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement,
52
    // the 'in' source image must remain in its current colorspace, which means the colorspace of
53
    // this FE node is the same as the input.
54
0
    return fctx.resolveInputColorspace(ctx, this->getIn());
55
0
}
56
57
template <>
58
bool SkSVGAttributeParser::parse<SkSVGFeDisplacementMap::ChannelSelector>(
59
0
        SkSVGFeDisplacementMap::ChannelSelector* channel) {
60
0
    static constexpr std::tuple<const char*, SkSVGFeDisplacementMap::ChannelSelector> gMap[] = {
61
0
            { "R", SkSVGFeDisplacementMap::ChannelSelector::kR },
62
0
            { "G", SkSVGFeDisplacementMap::ChannelSelector::kG },
63
0
            { "B", SkSVGFeDisplacementMap::ChannelSelector::kB },
64
0
            { "A", SkSVGFeDisplacementMap::ChannelSelector::kA },
65
0
    };
66
67
0
    return this->parseEnumMap(gMap, channel) && this->parseEOSToken();
68
0
}