1 /* 2 * Copyright 2017 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 "SkSVGUse.h" 9 10 #include "SkCanvas.h" 11 #include "SkSVGRenderContext.h" 12 #include "SkSVGValue.h" 13 14 SkSVGUse::SkSVGUse() : INHERITED(SkSVGTag::kUse) {} 15 16 void SkSVGUse::appendChild(sk_sp<SkSVGNode>) { 17 SkDebugf("cannot append child nodes to this element.\n"); 18 } 19 20 void SkSVGUse::setHref(const SkSVGStringType& href) { 21 fHref = href; 22 } 23 24 void SkSVGUse::setX(const SkSVGLength& x) { 25 fX = x; 26 } 27 28 void SkSVGUse::setY(const SkSVGLength& y) { 29 fY = y; 30 } 31 32 void SkSVGUse::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) { 33 switch (attr) { 34 case SkSVGAttribute::kHref: 35 if (const auto* href = v.as<SkSVGStringValue>()) { 36 this->setHref(*href); 37 } 38 break; 39 case SkSVGAttribute::kX: 40 if (const auto* x = v.as<SkSVGLengthValue>()) { 41 this->setX(*x); 42 } 43 break; 44 case SkSVGAttribute::kY: 45 if (const auto* y = v.as<SkSVGLengthValue>()) { 46 this->setY(*y); 47 } 48 break; 49 default: 50 this->INHERITED::onSetAttribute(attr, v); 51 } 52 } 53 54 bool SkSVGUse::onPrepareToRender(SkSVGRenderContext* ctx) const { 55 if (fHref.value().isEmpty() || !INHERITED::onPrepareToRender(ctx)) { 56 return false; 57 } 58 59 if (fX.value() || fY.value()) { 60 // Restored when the local SkSVGRenderContext leaves scope. 61 ctx->saveOnce(); 62 ctx->canvas()->translate(fX.value(), fY.value()); 63 } 64 65 // TODO: width/height override for <svg> targets. 66 67 return true; 68 } 69 70 void SkSVGUse::onRender(const SkSVGRenderContext& ctx) const { 71 const auto* ref = ctx.findNodeById(fHref); 72 if (!ref) { 73 return; 74 } 75 76 ref->render(ctx); 77 } 78 79 SkPath SkSVGUse::onAsPath(const SkSVGRenderContext& ctx) const { 80 const auto* ref = ctx.findNodeById(fHref); 81 if (!ref) { 82 return SkPath(); 83 } 84 85 return ref->asPath(ctx); 86 } 87
