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 "SkCanvas.h"
9 #include "SkSVGRenderContext.h"
10 #include "SkSVGSVG.h"
11 #include "SkSVGValue.h"
12
SkSVGSVG()13 SkSVGSVG::SkSVGSVG() : INHERITED(SkSVGTag::kSvg) { }
14
onPrepareToRender(SkSVGRenderContext * ctx) const15 bool SkSVGSVG::onPrepareToRender(SkSVGRenderContext* ctx) const {
16 auto viewPortRect = ctx->lengthContext().resolveRect(fX, fY, fWidth, fHeight);
17 auto contentMatrix = SkMatrix::MakeTrans(viewPortRect.x(), viewPortRect.y());
18 auto viewPort = SkSize::Make(viewPortRect.width(), viewPortRect.height());
19
20 if (fViewBox.isValid()) {
21 const SkRect& viewBox = *fViewBox.get();
22
23 // An empty viewbox disables rendering.
24 if (viewBox.isEmpty()) {
25 return false;
26 }
27
28 // A viewBox overrides the intrinsic viewport.
29 viewPort = SkSize::Make(viewBox.width(), viewBox.height());
30
31 contentMatrix.preConcat(
32 SkMatrix::MakeRectToRect(viewBox, viewPortRect, SkMatrix::kFill_ScaleToFit));
33 }
34
35 if (!contentMatrix.isIdentity()) {
36 ctx->canvas()->save();
37 ctx->canvas()->concat(contentMatrix);
38 }
39
40 if (viewPort != ctx->lengthContext().viewPort()) {
41 ctx->writableLengthContext()->setViewPort(viewPort);
42 }
43
44 return this->INHERITED::onPrepareToRender(ctx);
45 }
46
setX(const SkSVGLength & x)47 void SkSVGSVG::setX(const SkSVGLength& x) {
48 fX = x;
49 }
50
setY(const SkSVGLength & y)51 void SkSVGSVG::setY(const SkSVGLength& y) {
52 fY = y;
53 }
54
setWidth(const SkSVGLength & w)55 void SkSVGSVG::setWidth(const SkSVGLength& w) {
56 fWidth = w;
57 }
58
setHeight(const SkSVGLength & h)59 void SkSVGSVG::setHeight(const SkSVGLength& h) {
60 fHeight = h;
61 }
62
setViewBox(const SkSVGViewBoxType & vb)63 void SkSVGSVG::setViewBox(const SkSVGViewBoxType& vb) {
64 fViewBox.set(vb);
65 }
66
onSetAttribute(SkSVGAttribute attr,const SkSVGValue & v)67 void SkSVGSVG::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
68 switch (attr) {
69 case SkSVGAttribute::kX:
70 if (const auto* x = v.as<SkSVGLengthValue>()) {
71 this->setX(*x);
72 }
73 break;
74 case SkSVGAttribute::kY:
75 if (const auto* y = v.as<SkSVGLengthValue>()) {
76 this->setY(*y);
77 }
78 break;
79 case SkSVGAttribute::kWidth:
80 if (const auto* w = v.as<SkSVGLengthValue>()) {
81 this->setWidth(*w);
82 }
83 break;
84 case SkSVGAttribute::kHeight:
85 if (const auto* h = v.as<SkSVGLengthValue>()) {
86 this->setHeight(*h);
87 }
88 break;
89 case SkSVGAttribute::kViewBox:
90 if (const auto* vb = v.as<SkSVGViewBoxValue>()) {
91 this->setViewBox(*vb);
92 }
93 break;
94 default:
95 this->INHERITED::onSetAttribute(attr, v);
96 }
97 }
98
99 // https://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
intrinsicSize(const SkSVGLengthContext & lctx) const100 SkSize SkSVGSVG::intrinsicSize(const SkSVGLengthContext& lctx) const {
101 // Percentage values do not provide an intrinsic size.
102 if (fWidth.unit() == SkSVGLength::Unit::kPercentage ||
103 fHeight.unit() == SkSVGLength::Unit::kPercentage) {
104 return SkSize::Make(0, 0);
105 }
106
107 return SkSize::Make(lctx.resolve(fWidth, SkSVGLengthContext::LengthType::kHorizontal),
108 lctx.resolve(fHeight, SkSVGLengthContext::LengthType::kVertical));
109 }
110