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* Copyright 2016 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkSVGRenderContext_DEFINED
#define SkSVGRenderContext_DEFINED
#include "experimental/svg/model/SkSVGAttribute.h"
#include "experimental/svg/model/SkSVGIDMapper.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkRect.h"
#include "include/core/SkSize.h"
#include "include/core/SkTypes.h"
#include "src/core/SkTLazy.h"
class SkCanvas;
class SkSVGLength;
class SkSVGLengthContext {
SkSVGLengthContext(const SkSize& viewport, SkScalar dpi = 90)
: fViewport(viewport), fDPI(dpi) {}
enum class LengthType {
const SkSize& viewPort() const { return fViewport; }
void setViewPort(const SkSize& viewport) { fViewport = viewport; }
SkScalar resolve(const SkSVGLength&, LengthType) const;
SkRect resolveRect(const SkSVGLength& x, const SkSVGLength& y,
const SkSVGLength& w, const SkSVGLength& h) const;
SkSize fViewport;
SkScalar fDPI;
struct SkSVGPresentationContext {
SkSVGPresentationContext(const SkSVGPresentationContext&) = default;
SkSVGPresentationContext& operator=(const SkSVGPresentationContext&) = default;
// Inherited presentation attributes, computed for the current node.
SkSVGPresentationAttributes fInherited;
// Cached paints, reflecting the current presentation attributes.
SkPaint fFillPaint;
SkPaint fStrokePaint;
class SkSVGRenderContext {
SkSVGRenderContext(SkCanvas*, const SkSVGIDMapper&, const SkSVGLengthContext&,
const SkSVGPresentationContext&);
SkSVGRenderContext(const SkSVGRenderContext&);
SkSVGRenderContext(const SkSVGRenderContext&, SkCanvas*);
const SkSVGLengthContext& lengthContext() const { return *fLengthContext; }
SkSVGLengthContext* writableLengthContext() { return fLengthContext.writable(); }
const SkSVGPresentationContext& presentationContext() const { return *fPresentationContext; }
SkCanvas* canvas() const { return fCanvas; }
void saveOnce();
enum ApplyFlags {
kLeaf = 1 << 0, // the target node doesn't have descendants
void applyPresentationAttributes(const SkSVGPresentationAttributes&, uint32_t flags);
// Scoped wrapper that temporarily clears the original node reference.
class BorrowedNode {
explicit BorrowedNode(sk_sp<SkSVGNode>* node)
: fOwner(node) {
if (fOwner) {
fBorrowed = std::move(*fOwner);
*fOwner = nullptr;
~BorrowedNode() {
if (fOwner) {
*fOwner = std::move(fBorrowed);
const SkSVGNode* get() const { return fBorrowed.get(); }
const SkSVGNode* operator->() const { return fBorrowed.get(); }
const SkSVGNode& operator*() const { return *fBorrowed; }
operator bool() const { return !!fBorrowed; }
// noncopyable
BorrowedNode(const BorrowedNode&) = delete;
BorrowedNode& operator=(BorrowedNode&) = delete;
sk_sp<SkSVGNode>* fOwner;
sk_sp<SkSVGNode> fBorrowed;
// Note: the id->node association is cleared for the lifetime of the returned value
// (effectively breaks reference cycles, assuming appropriate return value scoping).
BorrowedNode findNodeById(const SkString&) const;
const SkPaint* fillPaint() const;
const SkPaint* strokePaint() const;
// The local computed clip path (not inherited).
const SkPath* clipPath() const { return fClipPath.getMaybeNull(); }
// Stack-only
void* operator new(size_t) = delete;
void* operator new(size_t, void*) = delete;
SkSVGRenderContext& operator=(const SkSVGRenderContext&) = delete;
void applyOpacity(SkScalar opacity, uint32_t flags);
void applyClip(const SkSVGClip&);
void updatePaintsWithCurrentColor(const SkSVGPresentationAttributes&);
const SkSVGIDMapper& fIDMapper;
SkTCopyOnFirstWrite<SkSVGLengthContext> fLengthContext;
SkTCopyOnFirstWrite<SkSVGPresentationContext> fPresentationContext;
SkCanvas* fCanvas;
// The save count on 'fCanvas' at construction time.
// A restoreToCount() will be issued on destruction.
int fCanvasSaveCount;
// clipPath, if present for the current context (not inherited).
SkTLazy<SkPath> fClipPath;
#endif // SkSVGRenderContext_DEFINED