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 "modules/svg/include/SkSVGEllipse.h"
9
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkRect.h"
12 #include "modules/svg/include/SkSVGAttributeParser.h"
13 #include "modules/svg/include/SkSVGRenderContext.h"
14 #include "modules/svg/include/SkSVGTypes.h"
15 #include "modules/svg/src/SkSVGRectPriv.h"
16
17 class SkPaint;
18 enum class SkPathFillType;
19
SkSVGEllipse()20 SkSVGEllipse::SkSVGEllipse() : INHERITED(SkSVGTag::kEllipse) {}
21
parseAndSetAttribute(const char * n,const char * v)22 bool SkSVGEllipse::parseAndSetAttribute(const char* n, const char* v) {
23 return INHERITED::parseAndSetAttribute(n, v) ||
24 this->setCx(SkSVGAttributeParser::parse<SkSVGLength>("cx", n, v)) ||
25 this->setCy(SkSVGAttributeParser::parse<SkSVGLength>("cy", n, v)) ||
26 this->setRx(SkSVGAttributeParser::parse<SkSVGLength>("rx", n, v)) ||
27 this->setRy(SkSVGAttributeParser::parse<SkSVGLength>("ry", n, v));
28 }
29
resolve(const SkSVGLengthContext & lctx) const30 SkRect SkSVGEllipse::resolve(const SkSVGLengthContext& lctx) const {
31 const auto cx = lctx.resolve(fCx, SkSVGLengthContext::LengthType::kHorizontal);
32 const auto cy = lctx.resolve(fCy, SkSVGLengthContext::LengthType::kVertical);
33
34 // https://www.w3.org/TR/SVG2/shapes.html#EllipseElement
35 //
36 // An auto value for either rx or ry is converted to a used value, following the rules given
37 // above for rectangles (but without any clamping based on width or height).
38 const auto [ rx, ry ] = ResolveOptionalRadii(fRx, fRy, lctx);
39
40 // A computed value of zero for either dimension, or a computed value of auto for both
41 // dimensions, disables rendering of the element.
42 return (rx > 0 && ry > 0)
43 ? SkRect::MakeXYWH(cx - rx, cy - ry, rx * 2, ry * 2)
44 : SkRect::MakeEmpty();
45 }
46
onDraw(SkCanvas * canvas,const SkSVGLengthContext & lctx,const SkPaint & paint,SkPathFillType) const47 void SkSVGEllipse::onDraw(SkCanvas* canvas, const SkSVGLengthContext& lctx,
48 const SkPaint& paint, SkPathFillType) const {
49 canvas->drawOval(this->resolve(lctx), paint);
50 }
51
onAsPath(const SkSVGRenderContext & ctx) const52 SkPath SkSVGEllipse::onAsPath(const SkSVGRenderContext& ctx) const {
53 SkPath path = SkPath::Oval(this->resolve(ctx.lengthContext()));
54 this->mapToParent(&path);
55
56 return path;
57 }
58