third_party/blink/renderer/platform/graphics/intercepting_canvas.h - chromium/src - Git at Google

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_

 #include "third_party/blink/renderer/platform/graphics/paint/paint_record.h"
 #include "third_party/blink/renderer/platform/wtf/allocator.h"
 #include "third_party/blink/renderer/platform/wtf/assertions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"

 namespace blink {

 class InterceptingCanvasBase : public SkCanvas {
  public:
   template <typename DerivedCanvas>
   class CanvasInterceptorBase {
     STACK_ALLOCATED();

    protected:
     CanvasInterceptorBase(InterceptingCanvasBase* canvas) : canvas_(canvas) {
       ++canvas_->call_nesting_depth_;
     }

     ~CanvasInterceptorBase() {
       DCHECK_GT(canvas_->call_nesting_depth_, 0u);
       if (!--canvas_->call_nesting_depth_)
         canvas_->call_count_++;
     }

     DerivedCanvas* Canvas() { return static_cast<DerivedCanvas*>(canvas_); }
     bool TopLevelCall() const { return canvas_->CallNestingDepth() == 1; }
     InterceptingCanvasBase* canvas_;

    private:
     DISALLOW_COPY_AND_ASSIGN(CanvasInterceptorBase);
   };

   void ResetStepCount() { call_count_ = 0; }

  protected:
   explicit InterceptingCanvasBase(SkBitmap bitmap)
       : SkCanvas(bitmap), call_nesting_depth_(0), call_count_(0) {}
   InterceptingCanvasBase(int width, int height)
       : SkCanvas(width, height), call_nesting_depth_(0), call_count_(0) {}

   void UnrollDrawPicture(const SkPicture*,
                          const SkMatrix*,
                          const SkPaint*,
                          SkPicture::AbortCallback*);

   void onDrawPaint(const SkPaint&) override = 0;
   void onDrawPoints(PointMode,
                     size_t count,
                     const SkPoint pts[],
                     const SkPaint&) override = 0;
   void onDrawRect(const SkRect&, const SkPaint&) override = 0;
   void onDrawOval(const SkRect&, const SkPaint&) override = 0;
   void onDrawRRect(const SkRRect&, const SkPaint&) override = 0;
   void onDrawPath(const SkPath&, const SkPaint&) override = 0;
   void onDrawBitmap(const SkBitmap&,
                     SkScalar left,
                     SkScalar top,
                     const SkPaint*) override = 0;
   void onDrawBitmapRect(const SkBitmap&,
                         const SkRect* src,
                         const SkRect& dst,
                         const SkPaint*,
                         SrcRectConstraint) override = 0;
   void onDrawBitmapNine(const SkBitmap&,
                         const SkIRect& center,
                         const SkRect& dst,
                         const SkPaint*) override = 0;
   void onDrawImage(const SkImage*,
                    SkScalar,
                    SkScalar,
                    const SkPaint*) override = 0;
   void onDrawImageRect(const SkImage*,
                        const SkRect* src,
                        const SkRect& dst,
                        const SkPaint*,
                        SrcRectConstraint) override = 0;
   void onDrawVerticesObject(const SkVertices*,
                             SkBlendMode bmode,
                             const SkPaint&) override = 0;

   void onDrawDRRect(const SkRRect& outer,
                     const SkRRect& inner,
                     const SkPaint&) override = 0;
   void onDrawTextBlob(const SkTextBlob*,
                       SkScalar x,
                       SkScalar y,
                       const SkPaint&) override = 0;
   void onClipRect(const SkRect&, SkClipOp, ClipEdgeStyle) override = 0;
   void onClipRRect(const SkRRect&, SkClipOp, ClipEdgeStyle) override = 0;
   void onClipPath(const SkPath&, SkClipOp, ClipEdgeStyle) override = 0;
   void onClipRegion(const SkRegion&, SkClipOp) override = 0;
   void onDrawPicture(const SkPicture*,
                      const SkMatrix*,
                      const SkPaint*) override = 0;
   void didSetMatrix(const SkMatrix&) override = 0;
   void didConcat(const SkMatrix&) override = 0;
   void willSave() override = 0;
   SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec&) override = 0;
   void willRestore() override = 0;

   unsigned CallNestingDepth() const { return call_nesting_depth_; }
   unsigned CallCount() const { return call_count_; }

  private:
   unsigned call_nesting_depth_;
   unsigned call_count_;

   DISALLOW_COPY_AND_ASSIGN(InterceptingCanvasBase);
 };

 template <typename DerivedCanvas>
 class CanvasInterceptor {};

 template <typename DerivedCanvas,
           typename Interceptor = CanvasInterceptor<DerivedCanvas>>
 class InterceptingCanvas : public InterceptingCanvasBase {
  protected:
   explicit InterceptingCanvas(SkBitmap bitmap)
       : InterceptingCanvasBase(bitmap) {}
   InterceptingCanvas(int width, int height)
       : InterceptingCanvasBase(width, height) {}

   void onDrawPaint(const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawPaint(paint);
   }

   void onDrawPoints(PointMode mode,
                     size_t count,
                     const SkPoint pts[],
                     const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawPoints(mode, count, pts, paint);
   }

   void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawRect(rect, paint);
   }

   void onDrawOval(const SkRect& rect, const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawOval(rect, paint);
   }

   void onDrawRRect(const SkRRect& rrect, const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawRRect(rrect, paint);
   }

   void onDrawPath(const SkPath& path, const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawPath(path, paint);
   }

   void onDrawBitmap(const SkBitmap& bitmap,
                     SkScalar left,
                     SkScalar top,
                     const SkPaint* paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawBitmap(bitmap, left, top, paint);
   }

   void onDrawBitmapRect(const SkBitmap& bitmap,
                         const SkRect* src,
                         const SkRect& dst,
                         const SkPaint* paint,
                         SrcRectConstraint constraint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawBitmapRect(bitmap, src, dst, paint, constraint);
   }

   void onDrawBitmapNine(const SkBitmap& bitmap,
                         const SkIRect& center,
                         const SkRect& dst,
                         const SkPaint* paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawBitmapNine(bitmap, center, dst, paint);
   }

   void onDrawImage(const SkImage* image,
                    SkScalar x,
                    SkScalar y,
                    const SkPaint* paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawImage(image, x, y, paint);
   }

   void onDrawImageRect(const SkImage* image,
                        const SkRect* src,
                        const SkRect& dst,
                        const SkPaint* paint,
                        SrcRectConstraint constraint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawImageRect(image, src, dst, paint, constraint);
   }

   void onDrawVerticesObject(const SkVertices* vertices,
                             SkBlendMode bmode,
                             const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawVerticesObject(vertices, bmode, paint);
   }

   void onDrawDRRect(const SkRRect& outer,
                     const SkRRect& inner,
                     const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawDRRect(outer, inner, paint);
   }

   void onDrawTextBlob(const SkTextBlob* blob,
                       SkScalar x,
                       SkScalar y,
                       const SkPaint& paint) override {
     Interceptor interceptor(this);
     this->SkCanvas::onDrawTextBlob(blob, x, y, paint);
   }

   void onClipRect(const SkRect& rect,
                   SkClipOp op,
                   ClipEdgeStyle edge_style) override {
     Interceptor interceptor(this);
     this->SkCanvas::onClipRect(rect, op, edge_style);
   }

   void onClipRRect(const SkRRect& rrect,
                    SkClipOp op,
                    ClipEdgeStyle edge_style) override {
     Interceptor interceptor(this);
     this->SkCanvas::onClipRRect(rrect, op, edge_style);
   }

   void onClipPath(const SkPath& path,
                   SkClipOp op,
                   ClipEdgeStyle edge_style) override {
     Interceptor interceptor(this);
     this->SkCanvas::onClipPath(path, op, edge_style);
   }

   void onClipRegion(const SkRegion& region, SkClipOp op) override {
     Interceptor interceptor(this);
     this->SkCanvas::onClipRegion(region, op);
   }

   void onDrawPicture(const SkPicture* picture,
                      const SkMatrix* matrix,
                      const SkPaint* paint) override {
     this->UnrollDrawPicture(picture, matrix, paint, nullptr);
   }

   void didSetMatrix(const SkMatrix& matrix) override {
     Interceptor interceptor(this);
     this->SkCanvas::didSetMatrix(matrix);
   }

   void didConcat(const SkMatrix& matrix) override {
     Interceptor interceptor(this);
     this->SkCanvas::didConcat(matrix);
   }

   void willSave() override {
     Interceptor interceptor(this);
     this->SkCanvas::willSave();
   }

   SkCanvas::SaveLayerStrategy getSaveLayerStrategy(
       const SaveLayerRec& rec) override {
     Interceptor interceptor(this);
     return this->SkCanvas::getSaveLayerStrategy(rec);
   }

   void willRestore() override {
     Interceptor interceptor(this);
     this->SkCanvas::willRestore();
   }
 };

 }  // namespace blink

 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_
	/*
	* Copyright (C) 2013 Google Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_
	#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_

	#include "third_party/blink/renderer/platform/graphics/paint/paint_record.h"
	#include "third_party/blink/renderer/platform/wtf/allocator.h"
	#include "third_party/blink/renderer/platform/wtf/assertions.h"
	#include "third_party/skia/include/core/SkBitmap.h"
	#include "third_party/skia/include/core/SkCanvas.h"

	namespace blink {

	class InterceptingCanvasBase : public SkCanvas {
	public:
	template <typename DerivedCanvas>
	class CanvasInterceptorBase {
	STACK_ALLOCATED();

	protected:
	CanvasInterceptorBase(InterceptingCanvasBase* canvas) : canvas_(canvas) {
	++canvas_->call_nesting_depth_;
	}

	~CanvasInterceptorBase() {
	DCHECK_GT(canvas_->call_nesting_depth_, 0u);
	if (!--canvas_->call_nesting_depth_)
	canvas_->call_count_++;
	}

	DerivedCanvas* Canvas() { return static_cast<DerivedCanvas*>(canvas_); }
	bool TopLevelCall() const { return canvas_->CallNestingDepth() == 1; }
	InterceptingCanvasBase* canvas_;

	private:
	DISALLOW_COPY_AND_ASSIGN(CanvasInterceptorBase);
	};

	void ResetStepCount() { call_count_ = 0; }

	protected:
	explicit InterceptingCanvasBase(SkBitmap bitmap)
	: SkCanvas(bitmap), call_nesting_depth_(0), call_count_(0) {}
	InterceptingCanvasBase(int width, int height)
	: SkCanvas(width, height), call_nesting_depth_(0), call_count_(0) {}

	void UnrollDrawPicture(const SkPicture*,
	const SkMatrix*,
	const SkPaint*,
	SkPicture::AbortCallback*);

	void onDrawPaint(const SkPaint&) override = 0;
	void onDrawPoints(PointMode,
	size_t count,
	const SkPoint pts[],
	const SkPaint&) override = 0;
	void onDrawRect(const SkRect&, const SkPaint&) override = 0;
	void onDrawOval(const SkRect&, const SkPaint&) override = 0;
	void onDrawRRect(const SkRRect&, const SkPaint&) override = 0;
	void onDrawPath(const SkPath&, const SkPaint&) override = 0;
	void onDrawBitmap(const SkBitmap&,
	SkScalar left,
	SkScalar top,
	const SkPaint*) override = 0;
	void onDrawBitmapRect(const SkBitmap&,
	const SkRect* src,
	const SkRect& dst,
	const SkPaint*,
	SrcRectConstraint) override = 0;
	void onDrawBitmapNine(const SkBitmap&,
	const SkIRect& center,
	const SkRect& dst,
	const SkPaint*) override = 0;
	void onDrawImage(const SkImage*,
	SkScalar,
	SkScalar,
	const SkPaint*) override = 0;
	void onDrawImageRect(const SkImage*,
	const SkRect* src,
	const SkRect& dst,
	const SkPaint*,
	SrcRectConstraint) override = 0;
	void onDrawVerticesObject(const SkVertices*,
	SkBlendMode bmode,
	const SkPaint&) override = 0;

	void onDrawDRRect(const SkRRect& outer,
	const SkRRect& inner,
	const SkPaint&) override = 0;
	void onDrawTextBlob(const SkTextBlob*,
	SkScalar x,
	SkScalar y,
	const SkPaint&) override = 0;
	void onClipRect(const SkRect&, SkClipOp, ClipEdgeStyle) override = 0;
	void onClipRRect(const SkRRect&, SkClipOp, ClipEdgeStyle) override = 0;
	void onClipPath(const SkPath&, SkClipOp, ClipEdgeStyle) override = 0;
	void onClipRegion(const SkRegion&, SkClipOp) override = 0;
	void onDrawPicture(const SkPicture*,
	const SkMatrix*,
	const SkPaint*) override = 0;
	void didSetMatrix(const SkMatrix&) override = 0;
	void didConcat(const SkMatrix&) override = 0;
	void willSave() override = 0;
	SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec&) override = 0;
	void willRestore() override = 0;

	unsigned CallNestingDepth() const { return call_nesting_depth_; }
	unsigned CallCount() const { return call_count_; }

	private:
	unsigned call_nesting_depth_;
	unsigned call_count_;

	DISALLOW_COPY_AND_ASSIGN(InterceptingCanvasBase);
	};

	template <typename DerivedCanvas>
	class CanvasInterceptor {};

	template <typename DerivedCanvas,
	typename Interceptor = CanvasInterceptor<DerivedCanvas>>
	class InterceptingCanvas : public InterceptingCanvasBase {
	protected:
	explicit InterceptingCanvas(SkBitmap bitmap)
	: InterceptingCanvasBase(bitmap) {}
	InterceptingCanvas(int width, int height)
	: InterceptingCanvasBase(width, height) {}

	void onDrawPaint(const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawPaint(paint);
	}

	void onDrawPoints(PointMode mode,
	size_t count,
	const SkPoint pts[],
	const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawPoints(mode, count, pts, paint);
	}

	void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawRect(rect, paint);
	}

	void onDrawOval(const SkRect& rect, const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawOval(rect, paint);
	}

	void onDrawRRect(const SkRRect& rrect, const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawRRect(rrect, paint);
	}

	void onDrawPath(const SkPath& path, const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawPath(path, paint);
	}

	void onDrawBitmap(const SkBitmap& bitmap,
	SkScalar left,
	SkScalar top,
	const SkPaint* paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawBitmap(bitmap, left, top, paint);
	}

	void onDrawBitmapRect(const SkBitmap& bitmap,
	const SkRect* src,
	const SkRect& dst,
	const SkPaint* paint,
	SrcRectConstraint constraint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawBitmapRect(bitmap, src, dst, paint, constraint);
	}

	void onDrawBitmapNine(const SkBitmap& bitmap,
	const SkIRect& center,
	const SkRect& dst,
	const SkPaint* paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawBitmapNine(bitmap, center, dst, paint);
	}

	void onDrawImage(const SkImage* image,
	SkScalar x,
	SkScalar y,
	const SkPaint* paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawImage(image, x, y, paint);
	}

	void onDrawImageRect(const SkImage* image,
	const SkRect* src,
	const SkRect& dst,
	const SkPaint* paint,
	SrcRectConstraint constraint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawImageRect(image, src, dst, paint, constraint);
	}

	void onDrawVerticesObject(const SkVertices* vertices,
	SkBlendMode bmode,
	const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawVerticesObject(vertices, bmode, paint);
	}

	void onDrawDRRect(const SkRRect& outer,
	const SkRRect& inner,
	const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawDRRect(outer, inner, paint);
	}

	void onDrawTextBlob(const SkTextBlob* blob,
	SkScalar x,
	SkScalar y,
	const SkPaint& paint) override {
	Interceptor interceptor(this);
	this->SkCanvas::onDrawTextBlob(blob, x, y, paint);
	}

	void onClipRect(const SkRect& rect,
	SkClipOp op,
	ClipEdgeStyle edge_style) override {
	Interceptor interceptor(this);
	this->SkCanvas::onClipRect(rect, op, edge_style);
	}

	void onClipRRect(const SkRRect& rrect,
	SkClipOp op,
	ClipEdgeStyle edge_style) override {
	Interceptor interceptor(this);
	this->SkCanvas::onClipRRect(rrect, op, edge_style);
	}

	void onClipPath(const SkPath& path,
	SkClipOp op,
	ClipEdgeStyle edge_style) override {
	Interceptor interceptor(this);
	this->SkCanvas::onClipPath(path, op, edge_style);
	}

	void onClipRegion(const SkRegion& region, SkClipOp op) override {
	Interceptor interceptor(this);
	this->SkCanvas::onClipRegion(region, op);
	}

	void onDrawPicture(const SkPicture* picture,
	const SkMatrix* matrix,
	const SkPaint* paint) override {
	this->UnrollDrawPicture(picture, matrix, paint, nullptr);
	}

	void didSetMatrix(const SkMatrix& matrix) override {
	Interceptor interceptor(this);
	this->SkCanvas::didSetMatrix(matrix);
	}

	void didConcat(const SkMatrix& matrix) override {
	Interceptor interceptor(this);
	this->SkCanvas::didConcat(matrix);
	}

	void willSave() override {
	Interceptor interceptor(this);
	this->SkCanvas::willSave();
	}

	SkCanvas::SaveLayerStrategy getSaveLayerStrategy(
	const SaveLayerRec& rec) override {
	Interceptor interceptor(this);
	return this->SkCanvas::getSaveLayerStrategy(rec);
	}

	void willRestore() override {
	Interceptor interceptor(this);
	this->SkCanvas::willRestore();
	}
	};

	} // namespace blink

	#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_INTERCEPTING_CANVAS_H_