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/SkSVGFeMorphology.h"
11#include "modules/svg/include/SkSVGFilterContext.h"
12#include "modules/svg/include/SkSVGRenderContext.h"
13#include "modules/svg/include/SkSVGValue.h"
14
15bool SkSVGFeMorphology::parseAndSetAttribute(const char* name, const char* value) {
16    return INHERITED::parseAndSetAttribute(name, value) ||
17           this->setOperator(SkSVGAttributeParser::parse<SkSVGFeMorphology::Operator>(
18                   "operator", name, value)) ||
19           this->setRadius(SkSVGAttributeParser::parse<SkSVGFeMorphology::Radius>(
20                   "radius", name, value));
21}
22
23sk_sp<SkImageFilter> SkSVGFeMorphology::onMakeImageFilter(const SkSVGRenderContext& ctx,
24                                                          const SkSVGFilterContext& fctx) const {
25    const SkRect cropRect = this->resolveFilterSubregion(ctx, fctx);
26    const SkSVGColorspace colorspace = this->resolveColorspace(ctx, fctx);
27    sk_sp<SkImageFilter> input = fctx.resolveInput(ctx, this->getIn(), colorspace);
28
29    const auto r = SkV2{fRadius.fX, fRadius.fY}
30                 * ctx.transformForCurrentOBB(fctx.primitiveUnits()).scale;
31    switch (fOperator) {
32        case Operator::kErode:
33            return SkImageFilters::Erode(r.x, r.y, input, cropRect);
34        case Operator::kDilate:
35            return SkImageFilters::Dilate(r.x, r.y, input, cropRect);
36    }
37
38    SkUNREACHABLE;
39}
40
41template <>
42bool SkSVGAttributeParser::parse<SkSVGFeMorphology::Operator>(SkSVGFeMorphology::Operator* op) {
43    static constexpr std::tuple<const char*, SkSVGFeMorphology::Operator> gMap[] = {
44            { "dilate", SkSVGFeMorphology::Operator::kDilate },
45            { "erode" , SkSVGFeMorphology::Operator::kErode  },
46    };
47
48    return this->parseEnumMap(gMap, op) && this->parseEOSToken();
49}
50
51template <>
52bool SkSVGAttributeParser::parse<SkSVGFeMorphology::Radius>(SkSVGFeMorphology::Radius* radius) {
53    std::vector<SkSVGNumberType> values;
54    if (!this->parse(&values)) {
55        return false;
56    }
57
58    radius->fX = values[0];
59    radius->fY = values.size() > 1 ? values[1] : values[0];
60    return true;
61}
62