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      1 /*
      2  * Copyright 2016 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 "SkGradientShader.h"
      9 #include "SkSVGLinearGradient.h"
     10 #include "SkSVGRenderContext.h"
     11 #include "SkSVGValue.h"
     12 
     13 SkSVGLinearGradient::SkSVGLinearGradient() : INHERITED(SkSVGTag::kLinearGradient) {}
     14 
     15 void SkSVGLinearGradient::setX1(const SkSVGLength& x1) {
     16     fX1 = x1;
     17 }
     18 
     19 void SkSVGLinearGradient::setY1(const SkSVGLength& y1) {
     20     fY1 = y1;
     21 }
     22 
     23 void SkSVGLinearGradient::setX2(const SkSVGLength& x2) {
     24     fX2 = x2;
     25 }
     26 
     27 void SkSVGLinearGradient::setY2(const SkSVGLength& y2) {
     28     fY2 = y2;
     29 }
     30 
     31 void SkSVGLinearGradient::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
     32     switch (attr) {
     33     case SkSVGAttribute::kX1:
     34         if (const auto* x1 = v.as<SkSVGLengthValue>()) {
     35             this->setX1(*x1);
     36         }
     37         break;
     38     case SkSVGAttribute::kY1:
     39         if (const auto* y1 = v.as<SkSVGLengthValue>()) {
     40             this->setY1(*y1);
     41         }
     42         break;
     43     case SkSVGAttribute::kX2:
     44         if (const auto* x2 = v.as<SkSVGLengthValue>()) {
     45             this->setX2(*x2);
     46         }
     47         break;
     48     case SkSVGAttribute::kY2:
     49         if (const auto* y2 = v.as<SkSVGLengthValue>()) {
     50             this->setY2(*y2);
     51         }
     52         break;
     53     default:
     54         this->INHERITED::onSetAttribute(attr, v);
     55     }
     56 }
     57 
     58 sk_sp<SkShader> SkSVGLinearGradient::onMakeShader(const SkSVGRenderContext& ctx,
     59                                                   const SkColor* colors, const SkScalar* pos,
     60                                                   int count, SkShader::TileMode tm,
     61                                                   const SkMatrix& localMatrix) const {
     62     const auto& lctx = ctx.lengthContext();
     63     const auto x1 = lctx.resolve(fX1, SkSVGLengthContext::LengthType::kHorizontal);
     64     const auto y1 = lctx.resolve(fY1, SkSVGLengthContext::LengthType::kVertical);
     65     const auto x2 = lctx.resolve(fX2, SkSVGLengthContext::LengthType::kHorizontal);
     66     const auto y2 = lctx.resolve(fY2, SkSVGLengthContext::LengthType::kVertical);
     67 
     68     const SkPoint pts[2] = { {x1, y1}, {x2, y2}};
     69 
     70     return SkGradientShader::MakeLinear(pts, colors, pos, count, tm, 0, &localMatrix);
     71 }
     72