SkSVGUse.cpp

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/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#include "modules/svg/include/SkSVGUse.h"
 
#include "include/core/SkCanvas.h"
#include "modules/svg/include/SkSVGRenderContext.h"
#include "modules/svg/include/SkSVGValue.h"
 
SkSVGUse::SkSVGUse() : INHERITED(SkSVGTag::kUse) {}
 
void SkSVGUse::appendChild(sk_sp<SkSVGNode>) {
    SkDebugf("cannot append child nodes to this element.\n");
}
 
bool SkSVGUse::parseAndSetAttribute(const char* n, const char* v) {
    return INHERITED::parseAndSetAttribute(n, v) ||
           this->setX(SkSVGAttributeParser::parse<SkSVGLength>("x", n, v)) ||
           this->setY(SkSVGAttributeParser::parse<SkSVGLength>("y", n, v)) ||
           this->setHref(SkSVGAttributeParser::parse<SkSVGIRI>("xlink:href", n, v));
}
 
bool SkSVGUse::onPrepareToRender(SkSVGRenderContext* ctx) const {
    if (fHref.iri().isEmpty() || !INHERITED::onPrepareToRender(ctx)) {
        return false;
    }
 
    if (fX.value() || fY.value()) {
        // Restored when the local SkSVGRenderContext leaves scope.
        ctx->saveOnce();
        ctx->canvas()->translate(fX.value(), fY.value());
    }
 
    // TODO: width/height override for <svg> targets.
 
    return true;
}
 
void SkSVGUse::onRender(const SkSVGRenderContext& ctx) const {
    const auto ref = ctx.findNodeById(fHref);
    if (!ref) {
        return;
    }
 
    ref->render(ctx);
}
 
SkPath SkSVGUse::onAsPath(const SkSVGRenderContext& ctx) const {
    const auto ref = ctx.findNodeById(fHref);
    if (!ref) {
        return SkPath();
    }
 
    return ref->asPath(ctx);
}
 
SkRect SkSVGUse::onObjectBoundingBox(const SkSVGRenderContext& ctx) const {
    const auto ref = ctx.findNodeById(fHref);
    if (!ref) {
        return SkRect::MakeEmpty();
    }
 
    const SkSVGLengthContext& lctx = ctx.lengthContext();
    const SkScalar x = lctx.resolve(fX, SkSVGLengthContext::LengthType::kHorizontal);
    const SkScalar y = lctx.resolve(fY, SkSVGLengthContext::LengthType::kVertical);
 
    SkRect bounds = ref->objectBoundingBox(ctx);
    bounds.offset(x, y);
 
    return bounds;
}