src/core/SkRecorder.cpp - skia - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkRecorder.h"
 #include "SkPatchUtils.h"
 #include "SkPicture.h"

 // SkCanvas will fail in mysterious ways if it doesn't know the real width and height.
 SkRecorder::SkRecorder(SkRecord* record, int width, int height)
     : SkCanvas(width, height), fRecord(record) {}

 void SkRecorder::forgetRecord() {
     fRecord = NULL;
 }

 // To make appending to fRecord a little less verbose.
 #define APPEND(T, ...) \
         SkNEW_PLACEMENT_ARGS(fRecord->append<SkRecords::T>(), SkRecords::T, (__VA_ARGS__))

 // For methods which must call back into SkCanvas.
 #define INHERITED(method, ...) this->SkCanvas::method(__VA_ARGS__)

 // The structs we're creating all copy their constructor arguments.  Given the way the SkRecords
 // framework works, sometimes they happen to technically be copied twice, which is fine and elided
 // into a single copy unless the class has a non-trivial copy constructor.  For classes with
 // non-trivial copy constructors, we skip the first copy (and its destruction) by wrapping the value
 // with delay_copy(), forcing the argument to be passed by const&.
 //
 // This is used below for SkBitmap, SkPaint, SkPath, and SkRegion, which all have non-trivial copy
 // constructors and destructors.  You'll know you've got a good candidate T if you see ~T() show up
 // unexpectedly on a profile of record time.  Otherwise don't bother.
 template <typename T>
 class Reference {
 public:
     Reference(const T& x) : fX(x) {}
     operator const T&() const { return fX; }
 private:
     const T& fX;
 };

 template <typename T>
 static Reference<T> delay_copy(const T& x) { return Reference<T>(x); }

 // Use copy() only for optional arguments, to be copied if present or skipped if not.
 // (For most types we just pass by value and let copy constructors do their thing.)
 template <typename T>
 T* SkRecorder::copy(const T* src) {
     if (NULL == src) {
         return NULL;
     }
     return SkNEW_PLACEMENT_ARGS(fRecord->alloc<T>(), T, (*src));
 }

 // This copy() is for arrays.
 // It will work with POD or non-POD, though currently we only use it for POD.
 template <typename T>
 T* SkRecorder::copy(const T src[], size_t count) {
     if (NULL == src) {
         return NULL;
     }
     T* dst = fRecord->alloc<T>(count);
     for (size_t i = 0; i < count; i++) {
         SkNEW_PLACEMENT_ARGS(dst + i, T, (src[i]));
     }
     return dst;
 }

 // Specialization for copying strings, using memcpy.
 // This measured around 2x faster for copying code points,
 // but I found no corresponding speedup for other arrays.
 template <>
 char* SkRecorder::copy(const char src[], size_t count) {
     if (NULL == src) {
         return NULL;
     }
     char* dst = fRecord->alloc<char>(count);
     memcpy(dst, src, count);
     return dst;
 }

 void SkRecorder::clear(SkColor color) {
     APPEND(Clear, color);
 }

 void SkRecorder::drawPaint(const SkPaint& paint) {
     APPEND(DrawPaint, delay_copy(paint));
 }

 void SkRecorder::drawPoints(PointMode mode,
                             size_t count,
                             const SkPoint pts[],
                             const SkPaint& paint) {
     APPEND(DrawPoints, delay_copy(paint), mode, count, this->copy(pts, count));
 }

 void SkRecorder::drawRect(const SkRect& rect, const SkPaint& paint) {
     APPEND(DrawRect, delay_copy(paint), rect);
 }

 void SkRecorder::drawOval(const SkRect& oval, const SkPaint& paint) {
     APPEND(DrawOval, delay_copy(paint), oval);
 }

 void SkRecorder::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
     APPEND(DrawRRect, delay_copy(paint), rrect);
 }

 void SkRecorder::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
     APPEND(DrawDRRect, delay_copy(paint), outer, inner);
 }

 void SkRecorder::drawPath(const SkPath& path, const SkPaint& paint) {
     APPEND(DrawPath, delay_copy(paint), delay_copy(path));
 }

 void SkRecorder::drawBitmap(const SkBitmap& bitmap,
                             SkScalar left,
                             SkScalar top,
                             const SkPaint* paint) {
     APPEND(DrawBitmap, this->copy(paint), delay_copy(bitmap), left, top);
 }

 void SkRecorder::drawBitmapRectToRect(const SkBitmap& bitmap,
                                       const SkRect* src,
                                       const SkRect& dst,
                                       const SkPaint* paint,
                                       DrawBitmapRectFlags flags) {
     APPEND(DrawBitmapRectToRect,
            this->copy(paint), delay_copy(bitmap), this->copy(src), dst, flags);
 }

 void SkRecorder::drawBitmapMatrix(const SkBitmap& bitmap,
                                   const SkMatrix& matrix,
                                   const SkPaint* paint) {
     APPEND(DrawBitmapMatrix, this->copy(paint), delay_copy(bitmap), matrix);
 }

 void SkRecorder::drawBitmapNine(const SkBitmap& bitmap,
                                 const SkIRect& center,
                                 const SkRect& dst,
                                 const SkPaint* paint) {
     APPEND(DrawBitmapNine, this->copy(paint), delay_copy(bitmap), center, dst);
 }

 void SkRecorder::drawSprite(const SkBitmap& bitmap, int left, int top, const SkPaint* paint) {
     APPEND(DrawSprite, this->copy(paint), delay_copy(bitmap), left, top);
 }

 void SkRecorder::onDrawText(const void* text, size_t byteLength,
                             SkScalar x, SkScalar y, const SkPaint& paint) {
     APPEND(DrawText,
            delay_copy(paint), this->copy((const char*)text, byteLength), byteLength, x, y);
 }

 void SkRecorder::onDrawPosText(const void* text, size_t byteLength,
                                const SkPoint pos[], const SkPaint& paint) {
     const unsigned points = paint.countText(text, byteLength);
     APPEND(DrawPosText,
            delay_copy(paint),
            this->copy((const char*)text, byteLength),
            byteLength,
            this->copy(pos, points));
 }

 void SkRecorder::onDrawPosTextH(const void* text, size_t byteLength,
                                 const SkScalar xpos[], SkScalar constY, const SkPaint& paint) {
     const unsigned points = paint.countText(text, byteLength);
     APPEND(DrawPosTextH,
            delay_copy(paint),
            this->copy((const char*)text, byteLength),
            byteLength,
            this->copy(xpos, points),
            constY);
 }

 void SkRecorder::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                   const SkMatrix* matrix, const SkPaint& paint) {
     APPEND(DrawTextOnPath,
            delay_copy(paint),
            this->copy((const char*)text, byteLength),
            byteLength,
            delay_copy(path),
            this->copy(matrix));
 }

 void SkRecorder::onDrawPicture(const SkPicture* pic, const SkMatrix* matrix, const SkPaint* paint) {
     APPEND(DrawPicture, this->copy(paint), pic, this->copy(matrix));
 }

 void SkRecorder::drawVertices(VertexMode vmode,
                               int vertexCount, const SkPoint vertices[],
                               const SkPoint texs[], const SkColor colors[],
                               SkXfermode* xmode,
                               const uint16_t indices[], int indexCount, const SkPaint& paint) {
     APPEND(DrawVertices, delay_copy(paint),
                          vmode,
                          vertexCount,
                          this->copy(vertices, vertexCount),
                          texs ? this->copy(texs, vertexCount) : NULL,
                          colors ? this->copy(colors, vertexCount) : NULL,
                          xmode,
                          this->copy(indices, indexCount),
                          indexCount);
 }

 void SkRecorder::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                              const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
     APPEND(DrawPatch, delay_copy(paint),
            cubics ? this->copy(cubics, SkPatchUtils::kNumCtrlPts) : NULL,
            colors ? this->copy(colors, SkPatchUtils::kNumCorners) : NULL,
            texCoords ? this->copy(texCoords, SkPatchUtils::kNumCorners) : NULL,
            xmode);
 }

 void SkRecorder::willSave() {
     APPEND(Save);
     INHERITED(willSave);
 }

 SkCanvas::SaveLayerStrategy SkRecorder::willSaveLayer(const SkRect* bounds,
                                                       const SkPaint* paint,
                                                       SkCanvas::SaveFlags flags) {
     APPEND(SaveLayer, this->copy(bounds), this->copy(paint), flags);
     INHERITED(willSaveLayer, bounds, paint, flags);
     return SkCanvas::kNoLayer_SaveLayerStrategy;
 }

 void SkRecorder::didRestore() {
     APPEND(Restore, this->getTotalMatrix());
     INHERITED(didRestore);
 }

 void SkRecorder::onPushCull(const SkRect& rect) {
     APPEND(PushCull, rect);
 }

 void SkRecorder::onPopCull() {
     APPEND(PopCull);
 }

 void SkRecorder::didConcat(const SkMatrix& matrix) {
     APPEND(Concat, matrix);
     INHERITED(didConcat, matrix);
 }

 void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
     SkASSERT(matrix == this->getTotalMatrix());
     APPEND(SetMatrix, matrix);
     INHERITED(didSetMatrix, matrix);
 }

 void SkRecorder::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     APPEND(ClipRect, rect, op, edgeStyle == kSoft_ClipEdgeStyle);
     INHERITED(onClipRect, rect, op, edgeStyle);
 }

 void SkRecorder::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     APPEND(ClipRRect, rrect, op, edgeStyle == kSoft_ClipEdgeStyle);
     INHERITED(updateClipConservativelyUsingBounds, rrect.getBounds(), op, false);
 }

 void SkRecorder::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     APPEND(ClipPath, delay_copy(path), op, edgeStyle == kSoft_ClipEdgeStyle);
     INHERITED(updateClipConservativelyUsingBounds, path.getBounds(), op, path.isInverseFillType());
 }

 void SkRecorder::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
     APPEND(ClipRegion, delay_copy(deviceRgn), op);
     INHERITED(onClipRegion, deviceRgn, op);
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkRecorder.h"
	#include "SkPatchUtils.h"
	#include "SkPicture.h"

	// SkCanvas will fail in mysterious ways if it doesn't know the real width and height.
	SkRecorder::SkRecorder(SkRecord* record, int width, int height)
	: SkCanvas(width, height), fRecord(record) {}

	void SkRecorder::forgetRecord() {
	fRecord = NULL;
	}

	// To make appending to fRecord a little less verbose.
	#define APPEND(T, ...) \
	SkNEW_PLACEMENT_ARGS(fRecord->append<SkRecords::T>(), SkRecords::T, (__VA_ARGS__))

	// For methods which must call back into SkCanvas.
	#define INHERITED(method, ...) this->SkCanvas::method(__VA_ARGS__)

	// The structs we're creating all copy their constructor arguments. Given the way the SkRecords
	// framework works, sometimes they happen to technically be copied twice, which is fine and elided
	// into a single copy unless the class has a non-trivial copy constructor. For classes with
	// non-trivial copy constructors, we skip the first copy (and its destruction) by wrapping the value
	// with delay_copy(), forcing the argument to be passed by const&.
	//
	// This is used below for SkBitmap, SkPaint, SkPath, and SkRegion, which all have non-trivial copy
	// constructors and destructors. You'll know you've got a good candidate T if you see ~T() show up
	// unexpectedly on a profile of record time. Otherwise don't bother.
	template <typename T>
	class Reference {
	public:
	Reference(const T& x) : fX(x) {}
	operator const T&() const { return fX; }
	private:
	const T& fX;
	};

	template <typename T>
	static Reference<T> delay_copy(const T& x) { return Reference<T>(x); }

	// Use copy() only for optional arguments, to be copied if present or skipped if not.
	// (For most types we just pass by value and let copy constructors do their thing.)
	template <typename T>
	T* SkRecorder::copy(const T* src) {
	if (NULL == src) {
	return NULL;
	}
	return SkNEW_PLACEMENT_ARGS(fRecord->alloc<T>(), T, (*src));
	}

	// This copy() is for arrays.
	// It will work with POD or non-POD, though currently we only use it for POD.
	template <typename T>
	T* SkRecorder::copy(const T src[], size_t count) {
	if (NULL == src) {
	return NULL;
	}
	T* dst = fRecord->alloc<T>(count);
	for (size_t i = 0; i < count; i++) {
	SkNEW_PLACEMENT_ARGS(dst + i, T, (src[i]));
	}
	return dst;
	}

	// Specialization for copying strings, using memcpy.
	// This measured around 2x faster for copying code points,
	// but I found no corresponding speedup for other arrays.
	template <>
	char* SkRecorder::copy(const char src[], size_t count) {
	if (NULL == src) {
	return NULL;
	}
	char* dst = fRecord->alloc<char>(count);
	memcpy(dst, src, count);
	return dst;
	}

	void SkRecorder::clear(SkColor color) {
	APPEND(Clear, color);
	}

	void SkRecorder::drawPaint(const SkPaint& paint) {
	APPEND(DrawPaint, delay_copy(paint));
	}

	void SkRecorder::drawPoints(PointMode mode,
	size_t count,
	const SkPoint pts[],
	const SkPaint& paint) {
	APPEND(DrawPoints, delay_copy(paint), mode, count, this->copy(pts, count));
	}

	void SkRecorder::drawRect(const SkRect& rect, const SkPaint& paint) {
	APPEND(DrawRect, delay_copy(paint), rect);
	}

	void SkRecorder::drawOval(const SkRect& oval, const SkPaint& paint) {
	APPEND(DrawOval, delay_copy(paint), oval);
	}

	void SkRecorder::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
	APPEND(DrawRRect, delay_copy(paint), rrect);
	}

	void SkRecorder::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
	APPEND(DrawDRRect, delay_copy(paint), outer, inner);
	}

	void SkRecorder::drawPath(const SkPath& path, const SkPaint& paint) {
	APPEND(DrawPath, delay_copy(paint), delay_copy(path));
	}

	void SkRecorder::drawBitmap(const SkBitmap& bitmap,
	SkScalar left,
	SkScalar top,
	const SkPaint* paint) {
	APPEND(DrawBitmap, this->copy(paint), delay_copy(bitmap), left, top);
	}

	void SkRecorder::drawBitmapRectToRect(const SkBitmap& bitmap,
	const SkRect* src,
	const SkRect& dst,
	const SkPaint* paint,
	DrawBitmapRectFlags flags) {
	APPEND(DrawBitmapRectToRect,
	this->copy(paint), delay_copy(bitmap), this->copy(src), dst, flags);
	}

	void SkRecorder::drawBitmapMatrix(const SkBitmap& bitmap,
	const SkMatrix& matrix,
	const SkPaint* paint) {
	APPEND(DrawBitmapMatrix, this->copy(paint), delay_copy(bitmap), matrix);
	}

	void SkRecorder::drawBitmapNine(const SkBitmap& bitmap,
	const SkIRect& center,
	const SkRect& dst,
	const SkPaint* paint) {
	APPEND(DrawBitmapNine, this->copy(paint), delay_copy(bitmap), center, dst);
	}

	void SkRecorder::drawSprite(const SkBitmap& bitmap, int left, int top, const SkPaint* paint) {
	APPEND(DrawSprite, this->copy(paint), delay_copy(bitmap), left, top);
	}

	void SkRecorder::onDrawText(const void* text, size_t byteLength,
	SkScalar x, SkScalar y, const SkPaint& paint) {
	APPEND(DrawText,
	delay_copy(paint), this->copy((const char*)text, byteLength), byteLength, x, y);
	}

	void SkRecorder::onDrawPosText(const void* text, size_t byteLength,
	const SkPoint pos[], const SkPaint& paint) {
	const unsigned points = paint.countText(text, byteLength);
	APPEND(DrawPosText,
	delay_copy(paint),
	this->copy((const char*)text, byteLength),
	byteLength,
	this->copy(pos, points));
	}

	void SkRecorder::onDrawPosTextH(const void* text, size_t byteLength,
	const SkScalar xpos[], SkScalar constY, const SkPaint& paint) {
	const unsigned points = paint.countText(text, byteLength);
	APPEND(DrawPosTextH,
	delay_copy(paint),
	this->copy((const char*)text, byteLength),
	byteLength,
	this->copy(xpos, points),
	constY);
	}

	void SkRecorder::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
	const SkMatrix* matrix, const SkPaint& paint) {
	APPEND(DrawTextOnPath,
	delay_copy(paint),
	this->copy((const char*)text, byteLength),
	byteLength,
	delay_copy(path),
	this->copy(matrix));
	}

	void SkRecorder::onDrawPicture(const SkPicture* pic, const SkMatrix* matrix, const SkPaint* paint) {
	APPEND(DrawPicture, this->copy(paint), pic, this->copy(matrix));
	}

	void SkRecorder::drawVertices(VertexMode vmode,
	int vertexCount, const SkPoint vertices[],
	const SkPoint texs[], const SkColor colors[],
	SkXfermode* xmode,
	const uint16_t indices[], int indexCount, const SkPaint& paint) {
	APPEND(DrawVertices, delay_copy(paint),
	vmode,
	vertexCount,
	this->copy(vertices, vertexCount),
	texs ? this->copy(texs, vertexCount) : NULL,
	colors ? this->copy(colors, vertexCount) : NULL,
	xmode,
	this->copy(indices, indexCount),
	indexCount);
	}

	void SkRecorder::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
	APPEND(DrawPatch, delay_copy(paint),
	cubics ? this->copy(cubics, SkPatchUtils::kNumCtrlPts) : NULL,
	colors ? this->copy(colors, SkPatchUtils::kNumCorners) : NULL,
	texCoords ? this->copy(texCoords, SkPatchUtils::kNumCorners) : NULL,
	xmode);
	}

	void SkRecorder::willSave() {
	APPEND(Save);
	INHERITED(willSave);
	}

	SkCanvas::SaveLayerStrategy SkRecorder::willSaveLayer(const SkRect* bounds,
	const SkPaint* paint,
	SkCanvas::SaveFlags flags) {
	APPEND(SaveLayer, this->copy(bounds), this->copy(paint), flags);
	INHERITED(willSaveLayer, bounds, paint, flags);
	return SkCanvas::kNoLayer_SaveLayerStrategy;
	}

	void SkRecorder::didRestore() {
	APPEND(Restore, this->getTotalMatrix());
	INHERITED(didRestore);
	}

	void SkRecorder::onPushCull(const SkRect& rect) {
	APPEND(PushCull, rect);
	}

	void SkRecorder::onPopCull() {
	APPEND(PopCull);
	}

	void SkRecorder::didConcat(const SkMatrix& matrix) {
	APPEND(Concat, matrix);
	INHERITED(didConcat, matrix);
	}

	void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
	SkASSERT(matrix == this->getTotalMatrix());
	APPEND(SetMatrix, matrix);
	INHERITED(didSetMatrix, matrix);
	}

	void SkRecorder::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	APPEND(ClipRect, rect, op, edgeStyle == kSoft_ClipEdgeStyle);
	INHERITED(onClipRect, rect, op, edgeStyle);
	}

	void SkRecorder::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	APPEND(ClipRRect, rrect, op, edgeStyle == kSoft_ClipEdgeStyle);
	INHERITED(updateClipConservativelyUsingBounds, rrect.getBounds(), op, false);
	}

	void SkRecorder::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	APPEND(ClipPath, delay_copy(path), op, edgeStyle == kSoft_ClipEdgeStyle);
	INHERITED(updateClipConservativelyUsingBounds, path.getBounds(), op, path.isInverseFillType());
	}

	void SkRecorder::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
	APPEND(ClipRegion, delay_copy(deviceRgn), op);
	INHERITED(onClipRegion, deviceRgn, op);
	}