blob: 6dec0e8978b0d285fcee0f199781490cbc0515a2 [file] [log] [blame]
* Copyright 2021 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/core/SkCanvas.h"
#include "include/core/SkImage.h"
#include "modules/svg/include/SkSVGAttributeParser.h"
#include "modules/svg/include/SkSVGImage.h"
#include "modules/svg/include/SkSVGRenderContext.h"
#include "modules/svg/include/SkSVGValue.h"
#include "src/utils/SkOSPath.h"
bool SkSVGImage::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->setWidth(SkSVGAttributeParser::parse<SkSVGLength>("width", n, v)) ||
this->setHeight(SkSVGAttributeParser::parse<SkSVGLength>("height", n, v)) ||
this->setHref(SkSVGAttributeParser::parse<SkSVGIRI>("xlink:href", n, v)) ||
"preserveAspectRatio", n, v));
bool SkSVGImage::onPrepareToRender(SkSVGRenderContext* ctx) const {
// Width or height of 0 disables rendering per spec:
return !fHref.iri().isEmpty() && fWidth.value() > 0 && fHeight.value() > 0 &&
static sk_sp<SkImage> LoadImage(const sk_sp<skresources::ResourceProvider>& rp,
const SkSVGIRI& href) {
// TODO: It may be better to use the SVG 'id' attribute as the asset id, to allow
// clients to perform asset substitution based on element id.
sk_sp<skresources::ImageAsset> imageAsset;
switch (href.type()) {
case SkSVGIRI::Type::kDataURI:
imageAsset = rp->loadImageAsset("", href.iri().c_str(), "");
case SkSVGIRI::Type::kNonlocal: {
const auto path = SkOSPath::Dirname(href.iri().c_str());
const auto name = SkOSPath::Basename(href.iri().c_str());
imageAsset = rp->loadImageAsset(path.c_str(), name.c_str(), /* id */ name.c_str());
SkDebugf("error loading image: unhandled iri type %d\n", href.type());
return nullptr;
return imageAsset ? imageAsset->getFrameData(0).image : nullptr;
SkRect SkSVGImage::resolveImageRect(const SkRect& viewBox, const SkRect& viewPort) const {
const SkMatrix m = ComputeViewboxMatrix(viewBox, viewPort, fPreserveAspectRatio);
// Map and place at x, y specified by image attributes
return m.mapRect(viewBox).makeOffset(viewPort.fLeft, viewPort.fTop);
void SkSVGImage::onRender(const SkSVGRenderContext& ctx) const {
const auto& rp = ctx.resourceProvider();
// TODO: svg sources
sk_sp<SkImage> image = LoadImage(rp, fHref);
if (!image) {
SkDebugf("can't render image: load image failed\n");
// Per spec: x, w, width, height attributes establish the new viewport.
const SkSVGLengthContext& lctx = ctx.lengthContext();
const SkRect viewPort = lctx.resolveRect(fX, fY, fWidth, fHeight);
// Per spec: raster content has implicit viewbox of '0 0 width height'.
const SkRect viewBox = SkRect::Make(image->bounds());
this->resolveImageRect(viewBox, viewPort),
SkPath SkSVGImage::onAsPath(const SkSVGRenderContext&) const { return {}; }
SkRect SkSVGImage::onObjectBoundingBox(const SkSVGRenderContext& ctx) const {
const SkSVGLengthContext& lctx = ctx.lengthContext();
return lctx.resolveRect(fX, fY, fWidth, fHeight);