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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SKIA_EXT_ANALYSIS_CANVAS_H_
#define SKIA_EXT_ANALYSIS_CANVAS_H_
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkDevice.h"
namespace skia {
class AnalysisDevice;
// Does not render anything, but gathers statistics about a region
// (specified as a clip rectangle) of an SkPicture as the picture is
// played back through it.
// To use: create a SkBitmap with kNo_Config, create an AnalysisDevice
// using that bitmap, and create an AnalysisCanvas using the device.
// Play a picture into the canvas, and then check isCheap().
class SK_API AnalysisCanvas : public SkCanvas {
public:
AnalysisCanvas(AnalysisDevice*);
virtual ~AnalysisCanvas();
// Returns true if the estimated cost of drawing is below an
// arbitrary threshold.
bool isCheap() const;
// Returns the estimated cost of drawing, in arbitrary units.
int getEstimatedCost() const;
virtual bool clipRect(const SkRect& rect,
SkRegion::Op op = SkRegion::kIntersect_Op,
bool doAntiAlias = false) OVERRIDE;
virtual bool clipPath(const SkPath& path,
SkRegion::Op op = SkRegion::kIntersect_Op,
bool doAntiAlias = false) OVERRIDE;
virtual bool clipRRect(const SkRRect& rrect,
SkRegion::Op op = SkRegion::kIntersect_Op,
bool doAntiAlias = false) OVERRIDE;
virtual int saveLayer(const SkRect* bounds, const SkPaint*,
SkCanvas::SaveFlags flags) OVERRIDE;
private:
typedef SkCanvas INHERITED;
};
class SK_API AnalysisDevice : public SkDevice {
public:
AnalysisDevice(const SkBitmap& bm);
virtual ~AnalysisDevice();
int getEstimatedCost() const;
protected:
virtual void clear(SkColor color) OVERRIDE;
virtual void drawPaint(const SkDraw&, const SkPaint& paint) OVERRIDE;
virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode,
size_t count, const SkPoint[],
const SkPaint& paint) OVERRIDE;
virtual void drawRect(const SkDraw&, const SkRect& r,
const SkPaint& paint) OVERRIDE;
virtual void drawOval(const SkDraw&, const SkRect& oval,
const SkPaint& paint) OVERRIDE;
virtual void drawPath(const SkDraw&, const SkPath& path,
const SkPaint& paint,
const SkMatrix* prePathMatrix = NULL,
bool pathIsMutable = false) OVERRIDE;
virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
const SkIRect* srcRectOrNull,
const SkMatrix& matrix, const SkPaint& paint)
OVERRIDE;
virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
int x, int y, const SkPaint& paint) OVERRIDE;
virtual void drawBitmapRect(const SkDraw&, const SkBitmap&,
const SkRect* srcOrNull, const SkRect& dst,
const SkPaint& paint) OVERRIDE;
virtual void drawText(const SkDraw&, const void* text, size_t len,
SkScalar x, SkScalar y, const SkPaint& paint)
OVERRIDE;
virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
const SkScalar pos[], SkScalar constY,
int scalarsPerPos, const SkPaint& paint) OVERRIDE;
virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
const SkPath& path, const SkMatrix* matrix,
const SkPaint& paint) OVERRIDE;
#ifdef SK_BUILD_FOR_ANDROID
virtual void drawPosTextOnPath(const SkDraw& draw, const void* text,
size_t len,
const SkPoint pos[], const SkPaint& paint,
const SkPath& path, const SkMatrix* matrix)
OVERRIDE;
#endif
virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode,
int vertexCount,
const SkPoint verts[], const SkPoint texs[],
const SkColor colors[], SkXfermode* xmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) OVERRIDE;
virtual void drawDevice(const SkDraw&, SkDevice*, int x, int y,
const SkPaint&) OVERRIDE;
int estimatedCost_;
private:
typedef SkDevice INHERITED;
};
} // namespace skia
#endif // SKIA_EXT_ANALYSIS_CANVAS_H_
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