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 "include/core/SkCanvas.h"
9 #include "modules/svg/include/SkSVGRenderContext.h"
10 #include "modules/svg/include/SkSVGSVG.h"
11 #include "modules/svg/include/SkSVGValue.h"
12
onPrepareToRender(SkSVGRenderContext * ctx) const13 bool SkSVGSVG::onPrepareToRender(SkSVGRenderContext* ctx) const {
14 // x/y are ignored for outermost svg elements
15 const auto x = fType == Type::kInner ? fX : SkSVGLength(0);
16 const auto y = fType == Type::kInner ? fY : SkSVGLength(0);
17
18 auto viewPortRect = ctx->lengthContext().resolveRectForSVG(x, y, fWidth, fHeight);
19 auto contentMatrix = SkMatrix::Translate(viewPortRect.x(), viewPortRect.y());
20 auto viewPort = SkSize::Make(viewPortRect.width(), viewPortRect.height());
21
22 if (fViewBox.isValid()) {
23 const SkRect& viewBox = *fViewBox;
24
25 // An empty viewbox disables rendering.
26 if (viewBox.isEmpty()) {
27 return false;
28 }
29
30 // A viewBox overrides the intrinsic viewport.
31 viewPort = SkSize::Make(viewBox.width(), viewBox.height());
32
33 contentMatrix.preConcat(ComputeViewboxMatrix(viewBox, viewPortRect, fPreserveAspectRatio));
34 }
35
36 if (!contentMatrix.isIdentity()) {
37 ctx->saveOnce();
38 ctx->canvas()->concat(contentMatrix);
39 }
40
41 if (viewPort != ctx->lengthContext().viewPort()) {
42 ctx->writableLengthContext()->setViewPort(viewPort);
43 }
44
45 return this->INHERITED::onPrepareToRender(ctx);
46 }
47
onSetAttribute(SkSVGAttribute attr,const SkSVGValue & v)48 void SkSVGSVG::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
49 switch (attr) {
50 case SkSVGAttribute::kX:
51 if (const auto* x = v.as<SkSVGLengthValue>()) {
52 this->setX(*x);
53 }
54 break;
55 case SkSVGAttribute::kY:
56 if (const auto* y = v.as<SkSVGLengthValue>()) {
57 this->setY(*y);
58 }
59 break;
60 case SkSVGAttribute::kWidth:
61 if (const auto* w = v.as<SkSVGLengthValue>()) {
62 this->setWidth(*w);
63 }
64 break;
65 case SkSVGAttribute::kHeight:
66 if (const auto* h = v.as<SkSVGLengthValue>()) {
67 this->setHeight(*h);
68 }
69 break;
70 case SkSVGAttribute::kViewBox:
71 if (const auto* vb = v.as<SkSVGViewBoxValue>()) {
72 this->setViewBox(*vb);
73 }
74 break;
75 case SkSVGAttribute::kPreserveAspectRatio:
76 if (const auto* par = v.as<SkSVGPreserveAspectRatioValue>()) {
77 this->setPreserveAspectRatio(*par);
78 }
79 break;
80 default:
81 this->INHERITED::onSetAttribute(attr, v);
82 }
83 }
84
85 // https://www.w3.org/TR/SVG11/coords.html#IntrinsicSizing
intrinsicSize(const SkSVGLengthContext & lctx) const86 SkSize SkSVGSVG::intrinsicSize(const SkSVGLengthContext& lctx) const {
87 // Percentage values do not provide an intrinsic size.
88 if (fWidth.unit() == SkSVGLength::Unit::kPercentage ||
89 fHeight.unit() == SkSVGLength::Unit::kPercentage) {
90 return SkSize::Make(0, 0);
91 }
92
93 return SkSize::Make(lctx.resolveForSVG(fWidth, SkSVGLengthContext::LengthType::kHorizontal),
94 lctx.resolveForSVG(fHeight, SkSVGLengthContext::LengthType::kVertical));
95 }
96