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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 "SkPaint.h"
#include "SkPath.h"
#include "SkRect.h"
#include "SkSize.h"
#include "SkSVGAttribute.h"
#include "SkSVGIDMapper.h"
#include "SkTLazy.h"
#include "SkTypes.h"
class SkCanvas;
class SkSVGLength;
class SkSVGLengthContext {
public:
SkSVGLengthContext(const SkSize& viewport, SkScalar dpi = 90)
: fViewport(viewport), fDPI(dpi) {}
enum class LengthType {
kHorizontal,
kVertical,
kOther,
};
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;
private:
SkSize fViewport;
SkScalar fDPI;
};
struct SkSVGPresentationContext {
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 {
public:
SkSVGRenderContext(SkCanvas*, const SkSVGIDMapper&, const SkSVGLengthContext&,
const SkSVGPresentationContext&);
SkSVGRenderContext(const SkSVGRenderContext&);
SkSVGRenderContext(const SkSVGRenderContext&, SkCanvas*);
~SkSVGRenderContext();
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);
const SkSVGNode* 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(); }
private:
// 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&);
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
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