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
13SkSVGSVG::SkSVGSVG() : INHERITED(SkSVGTag::kSvg) { }
14
15bool 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->saveOnce();
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
47void SkSVGSVG::setX(const SkSVGLength& x) {
48    fX = x;
49}
50
51void SkSVGSVG::setY(const SkSVGLength& y) {
52    fY = y;
53}
54
55void SkSVGSVG::setWidth(const SkSVGLength& w) {
56    fWidth = w;
57}
58
59void SkSVGSVG::setHeight(const SkSVGLength& h) {
60    fHeight = h;
61}
62
63void SkSVGSVG::setViewBox(const SkSVGViewBoxType& vb) {
64    fViewBox.set(vb);
65}
66
67void 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
100SkSize 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