submodule/skia/modules/svg/src/SkSVGFeGaussianBlur.cpp

   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/SkSVGFeGaussianBlur.h"
  11 #include "modules/svg/include/SkSVGFilterContext.h"
  12 #include "modules/svg/include/SkSVGRenderContext.h"
  13 #include "modules/svg/include/SkSVGValue.h"
  14
  15 bool SkSVGFeGaussianBlur::parseAndSetAttribute(const char* name, const char* value) {
  16     return INHERITED::parseAndSetAttribute(name, value) ||
  17            this->setStdDeviation(SkSVGAttributeParser::parse<SkSVGFeGaussianBlur::StdDeviation>(
  18                    "stdDeviation", name, value));
  19 }
  20
  21 sk_sp<SkImageFilter> SkSVGFeGaussianBlur::onMakeImageFilter(const SkSVGRenderContext& ctx,
  22                                                             const SkSVGFilterContext& fctx) const {
  23     const auto sigma = SkV2{fStdDeviation.fX, fStdDeviation.fY}
  24                      * ctx.transformForCurrentOBB(fctx.primitiveUnits()).scale;
  25
  26     return SkImageFilters::Blur(
  27             sigma.x, sigma.y,
  28             fctx.resolveInput(ctx, this->getIn(), this->resolveColorspace(ctx, fctx)),
  29             this->resolveFilterSubregion(ctx, fctx));
  30 }
  31
  32 template <>
  33 bool SkSVGAttributeParser::parse<SkSVGFeGaussianBlur::StdDeviation>(
  34         SkSVGFeGaussianBlur::StdDeviation* stdDeviation) {
  35     std::vector<SkSVGNumberType> values;
  36     if (!this->parse(&values)) {
  37         return false;
  38     }
  39
  40     stdDeviation->fX = values[0];
  41     stdDeviation->fY = values.size() > 1 ? values[1] : values[0];
  42     return true;
  43 }