src/gpu/GrPictureUtils.cpp - platform/external/skia - Gitiles

 /*
  * 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 "GrPictureUtils.h"
 #include "SkCanvasPriv.h"
 #include "SkDevice.h"
 #include "SkDraw.h"
 #include "SkPaintPriv.h"
 #include "SkPictureData.h"
 #include "SkPicturePlayback.h"

 SkPicture::AccelData::Key GPUAccelData::ComputeAccelDataKey() {
     static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();

     return gGPUID;
 }

 // The GrGather device performs GPU-backend-specific preprocessing on
 // a picture. The results are stored in a GPUAccelData.
 //
 // Currently the only interesting work is done in drawDevice (i.e., when a
 // saveLayer is collapsed back into its parent) and, maybe, in onCreateDevice.
 // All the current work could be done much more efficiently by just traversing the
 // raw op codes in the SkPicture (although we would still need to replay all the
 // clip calls).
 class GrGatherDevice : public SkBaseDevice {
 public:
     SK_DECLARE_INST_COUNT(GrGatherDevice)

     GrGatherDevice(int width, int height, SkPicturePlayback* playback, GPUAccelData* accelData,
                    int saveLayerDepth) {
         fPlayback = playback;
         fSaveLayerDepth = saveLayerDepth;
         fInfo.fValid = true;
         fInfo.fSize.set(width, height);
         fInfo.fPaint = NULL;
         fInfo.fSaveLayerOpID = fPlayback->curOpID();
         fInfo.fRestoreOpID = 0;
         fInfo.fHasNestedLayers = false;
         fInfo.fIsNested = (2 == fSaveLayerDepth);

         fEmptyBitmap.setInfo(SkImageInfo::MakeUnknown(fInfo.fSize.fWidth, fInfo.fSize.fHeight));
         fAccelData = accelData;
         fAlreadyDrawn = false;
     }

     virtual ~GrGatherDevice() { }

     virtual SkImageInfo imageInfo() const SK_OVERRIDE {
         return fEmptyBitmap.info();
     }

 #ifdef SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG
     virtual void writePixels(const SkBitmap& bitmap, int x, int y,
                              SkCanvas::Config8888 config8888) SK_OVERRIDE {
         NotSupported();
     }
 #endif
     virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }

 protected:
     virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
         return false;
     }
     virtual void clear(SkColor color) SK_OVERRIDE {
         NothingToDo();
     }
     virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
                             const SkPoint points[], const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawRect(const SkDraw& draw, const SkRect& rect,
                           const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawOval(const SkDraw& draw, const SkRect& rect,
                           const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawRRect(const SkDraw& draw, const SkRRect& rrect,
                            const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawPath(const SkDraw& draw, const SkPath& path,
                           const SkPaint& paint, const SkMatrix* prePathMatrix,
                           bool pathIsMutable) SK_OVERRIDE {
     }
     virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
                             const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
                             int x, int y, const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                 const SkRect* srcOrNull, const SkRect& dst,
                                 const SkPaint& paint,
                                 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
     }
     virtual void drawText(const SkDraw& draw, const void* text, size_t len,
                           SkScalar x, SkScalar y,
                           const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
                              const SkScalar pos[], SkScalar constY,
                              int scalarsPerPos, const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
                                 const SkPath& path, const SkMatrix* matrix,
                                 const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode, int vertexCount,
                               const SkPoint verts[], const SkPoint texs[],
                               const SkColor colors[], SkXfermode* xmode,
                               const uint16_t indices[], int indexCount,
                               const SkPaint& paint) SK_OVERRIDE {
     }
     virtual void drawDevice(const SkDraw& draw, SkBaseDevice* deviceIn, int x, int y,
                             const SkPaint& paint) SK_OVERRIDE {
         // deviceIn is the one that is being "restored" back to its parent
         GrGatherDevice* device = static_cast<GrGatherDevice*>(deviceIn);

         if (device->fAlreadyDrawn) {
             return;
         }

         device->fInfo.fRestoreOpID = fPlayback->curOpID();
         device->fInfo.fCTM = *draw.fMatrix;
         device->fInfo.fCTM.postTranslate(SkIntToScalar(-device->getOrigin().fX),
                                          SkIntToScalar(-device->getOrigin().fY));

         device->fInfo.fOffset = device->getOrigin();

         if (NeedsDeepCopy(paint)) {
             // This NULL acts as a signal that the paint was uncopyable (for now)
             device->fInfo.fPaint = NULL;
             device->fInfo.fValid = false;
         } else {
             device->fInfo.fPaint = SkNEW_ARGS(SkPaint, (paint));
         }

         fAccelData->addSaveLayerInfo(device->fInfo);
         device->fAlreadyDrawn = true;
     }
     // TODO: allow this call to return failure, or move to SkBitmapDevice only.
     virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
         return fEmptyBitmap;
     }
 #ifdef SK_SUPPORT_LEGACY_READPIXELSCONFIG
     virtual bool onReadPixels(const SkBitmap& bitmap,
                               int x, int y,
                               SkCanvas::Config8888 config8888) SK_OVERRIDE {
         NotSupported();
         return false;
     }
 #endif
     virtual void lockPixels() SK_OVERRIDE { NothingToDo(); }
     virtual void unlockPixels() SK_OVERRIDE { NothingToDo(); }
     virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
     virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
     virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
                              SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
         return false;
     }

 private:
     // The playback object driving this rendering
     SkPicturePlayback *fPlayback;

     SkBitmap fEmptyBitmap; // legacy -- need to remove

     // All information gathered during the gather process is stored here
     GPUAccelData* fAccelData;

     // true if this device has already been drawn back to its parent(s) at least
     // once.
     bool   fAlreadyDrawn;

     // The information regarding the saveLayer call this device represents.
     GPUAccelData::SaveLayerInfo fInfo;

     // The depth of this device in the saveLayer stack
     int fSaveLayerDepth;

     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
         NotSupported();
     }

     virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
         // we expect to only get called via savelayer, in which case it is fine.
         SkASSERT(kSaveLayer_Usage == usage);

         fInfo.fHasNestedLayers = true;
         return SkNEW_ARGS(GrGatherDevice, (info.width(), info.height(), fPlayback,
                                            fAccelData, fSaveLayerDepth+1));
     }

     virtual void flush() SK_OVERRIDE {}

     static void NotSupported() {
         SkDEBUGFAIL("this method should never be called");
     }

     static void NothingToDo() {}

     typedef SkBaseDevice INHERITED;
 };

 // The GrGatherCanvas allows saveLayers but simplifies clipping. It is really
 // only intended to be used as:
 //
 //      GrGatherDevice dev(w, h, picture, accelData);
 //      GrGatherCanvas canvas(..., picture);
 //      canvas.gather();
 //
 // which is all just to fill in 'accelData'
 class SK_API GrGatherCanvas : public SkCanvas {
 public:
     GrGatherCanvas(GrGatherDevice* device) : INHERITED(device) {}

 protected:
     // disable aa for speed
     virtual void onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
         this->INHERITED::onClipRect(rect, op, kHard_ClipEdgeStyle);
     }

     // for speed, just respect the bounds, and disable AA. May give us a few
     // false positives and negatives.
     virtual void onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
         this->updateClipConservativelyUsingBounds(path.getBounds(), op,
                                                   path.isInverseFillType());
     }
     virtual void onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
         this->updateClipConservativelyUsingBounds(rrect.getBounds(), op, false);
     }

     virtual void onDrawPicture(const SkPicture* picture, const SkMatrix* matrix,
                                const SkPaint* paint) SK_OVERRIDE {
         SkAutoCanvasMatrixPaint acmp(this, matrix, paint, picture->width(), picture->height());

         if (NULL != picture->fData.get()) {
             // Disable the BBH for the old path so all the draw calls
             // will be seen. The stock SkPicture::draw method can't be
             // invoked since it just uses a vanilla SkPicturePlayback.
             SkPicturePlayback playback(picture);
             playback.setUseBBH(false);
             playback.draw(this, NULL);
         } else {
             // Since we know this is the SkRecord path we can just call
             // SkPicture::draw.
             picture->draw(this);
         }
     }

 private:
     typedef SkCanvas INHERITED;
 };

 // GatherGPUInfo is only intended to be called within the context of SkGpuDevice's
 // EXPERIMENTAL_optimize method.
 void GatherGPUInfo(const SkPicture* pict, GPUAccelData* accelData) {
     if (NULL == pict || 0 == pict->width() || 0 == pict->height()) {
         return ;
     }

     // BBH-based rendering doesn't re-issue many of the operations the gather
     // process cares about (e.g., saves and restores) so it must be disabled.
     SkPicturePlayback playback(pict);
     playback.setUseBBH(false);

     GrGatherDevice device(pict->width(), pict->height(), &playback, accelData, 0);
     GrGatherCanvas canvas(&device);

     canvas.clipRect(SkRect::MakeWH(SkIntToScalar(pict->width()),
                                    SkIntToScalar(pict->height())),
                     SkRegion::kIntersect_Op, false);
     playback.draw(&canvas, NULL);
 }
	/*
	* 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 "GrPictureUtils.h"
	#include "SkCanvasPriv.h"
	#include "SkDevice.h"
	#include "SkDraw.h"
	#include "SkPaintPriv.h"
	#include "SkPictureData.h"
	#include "SkPicturePlayback.h"

	SkPicture::AccelData::Key GPUAccelData::ComputeAccelDataKey() {
	static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();

	return gGPUID;
	}

	// The GrGather device performs GPU-backend-specific preprocessing on
	// a picture. The results are stored in a GPUAccelData.
	//
	// Currently the only interesting work is done in drawDevice (i.e., when a
	// saveLayer is collapsed back into its parent) and, maybe, in onCreateDevice.
	// All the current work could be done much more efficiently by just traversing the
	// raw op codes in the SkPicture (although we would still need to replay all the
	// clip calls).
	class GrGatherDevice : public SkBaseDevice {
	public:
	SK_DECLARE_INST_COUNT(GrGatherDevice)

	GrGatherDevice(int width, int height, SkPicturePlayback* playback, GPUAccelData* accelData,
	int saveLayerDepth) {
	fPlayback = playback;
	fSaveLayerDepth = saveLayerDepth;
	fInfo.fValid = true;
	fInfo.fSize.set(width, height);
	fInfo.fPaint = NULL;
	fInfo.fSaveLayerOpID = fPlayback->curOpID();
	fInfo.fRestoreOpID = 0;
	fInfo.fHasNestedLayers = false;
	fInfo.fIsNested = (2 == fSaveLayerDepth);

	fEmptyBitmap.setInfo(SkImageInfo::MakeUnknown(fInfo.fSize.fWidth, fInfo.fSize.fHeight));
	fAccelData = accelData;
	fAlreadyDrawn = false;
	}

	virtual ~GrGatherDevice() { }

	virtual SkImageInfo imageInfo() const SK_OVERRIDE {
	return fEmptyBitmap.info();
	}

	#ifdef SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG
	virtual void writePixels(const SkBitmap& bitmap, int x, int y,
	SkCanvas::Config8888 config8888) SK_OVERRIDE {
	NotSupported();
	}
	#endif
	virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }

	protected:
	virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
	return false;
	}
	virtual void clear(SkColor color) SK_OVERRIDE {
	NothingToDo();
	}
	virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
	const SkPoint points[], const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawRect(const SkDraw& draw, const SkRect& rect,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawOval(const SkDraw& draw, const SkRect& rect,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawRRect(const SkDraw& draw, const SkRRect& rrect,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawPath(const SkDraw& draw, const SkPath& path,
	const SkPaint& paint, const SkMatrix* prePathMatrix,
	bool pathIsMutable) SK_OVERRIDE {
	}
	virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
	const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
	int x, int y, const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
	const SkRect* srcOrNull, const SkRect& dst,
	const SkPaint& paint,
	SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
	}
	virtual void drawText(const SkDraw& draw, const void* text, size_t len,
	SkScalar x, SkScalar y,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
	const SkScalar pos[], SkScalar constY,
	int scalarsPerPos, const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
	const SkPath& path, const SkMatrix* matrix,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode, int vertexCount,
	const SkPoint verts[], const SkPoint texs[],
	const SkColor colors[], SkXfermode* xmode,
	const uint16_t indices[], int indexCount,
	const SkPaint& paint) SK_OVERRIDE {
	}
	virtual void drawDevice(const SkDraw& draw, SkBaseDevice* deviceIn, int x, int y,
	const SkPaint& paint) SK_OVERRIDE {
	// deviceIn is the one that is being "restored" back to its parent
	GrGatherDevice* device = static_cast<GrGatherDevice*>(deviceIn);

	if (device->fAlreadyDrawn) {
	return;
	}

	device->fInfo.fRestoreOpID = fPlayback->curOpID();
	device->fInfo.fCTM = *draw.fMatrix;
	device->fInfo.fCTM.postTranslate(SkIntToScalar(-device->getOrigin().fX),
	SkIntToScalar(-device->getOrigin().fY));

	device->fInfo.fOffset = device->getOrigin();

	if (NeedsDeepCopy(paint)) {
	// This NULL acts as a signal that the paint was uncopyable (for now)
	device->fInfo.fPaint = NULL;
	device->fInfo.fValid = false;
	} else {
	device->fInfo.fPaint = SkNEW_ARGS(SkPaint, (paint));
	}

	fAccelData->addSaveLayerInfo(device->fInfo);
	device->fAlreadyDrawn = true;
	}
	// TODO: allow this call to return failure, or move to SkBitmapDevice only.
	virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
	return fEmptyBitmap;
	}
	#ifdef SK_SUPPORT_LEGACY_READPIXELSCONFIG
	virtual bool onReadPixels(const SkBitmap& bitmap,
	int x, int y,
	SkCanvas::Config8888 config8888) SK_OVERRIDE {
	NotSupported();
	return false;
	}
	#endif
	virtual void lockPixels() SK_OVERRIDE { NothingToDo(); }
	virtual void unlockPixels() SK_OVERRIDE { NothingToDo(); }
	virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
	virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
	virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
	SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
	return false;
	}

	private:
	// The playback object driving this rendering
	SkPicturePlayback *fPlayback;

	SkBitmap fEmptyBitmap; // legacy -- need to remove

	// All information gathered during the gather process is stored here
	GPUAccelData* fAccelData;

	// true if this device has already been drawn back to its parent(s) at least
	// once.
	bool fAlreadyDrawn;

	// The information regarding the saveLayer call this device represents.
	GPUAccelData::SaveLayerInfo fInfo;

	// The depth of this device in the saveLayer stack
	int fSaveLayerDepth;

	virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
	NotSupported();
	}

	virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
	// we expect to only get called via savelayer, in which case it is fine.
	SkASSERT(kSaveLayer_Usage == usage);

	fInfo.fHasNestedLayers = true;
	return SkNEW_ARGS(GrGatherDevice, (info.width(), info.height(), fPlayback,
	fAccelData, fSaveLayerDepth+1));
	}

	virtual void flush() SK_OVERRIDE {}

	static void NotSupported() {
	SkDEBUGFAIL("this method should never be called");
	}

	static void NothingToDo() {}

	typedef SkBaseDevice INHERITED;
	};

	// The GrGatherCanvas allows saveLayers but simplifies clipping. It is really
	// only intended to be used as:
	//
	// GrGatherDevice dev(w, h, picture, accelData);
	// GrGatherCanvas canvas(..., picture);
	// canvas.gather();
	//
	// which is all just to fill in 'accelData'
	class SK_API GrGatherCanvas : public SkCanvas {
	public:
	GrGatherCanvas(GrGatherDevice* device) : INHERITED(device) {}

	protected:
	// disable aa for speed
	virtual void onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
	this->INHERITED::onClipRect(rect, op, kHard_ClipEdgeStyle);
	}

	// for speed, just respect the bounds, and disable AA. May give us a few
	// false positives and negatives.
	virtual void onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
	this->updateClipConservativelyUsingBounds(path.getBounds(), op,
	path.isInverseFillType());
	}
	virtual void onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
	this->updateClipConservativelyUsingBounds(rrect.getBounds(), op, false);
	}

	virtual void onDrawPicture(const SkPicture* picture, const SkMatrix* matrix,
	const SkPaint* paint) SK_OVERRIDE {
	SkAutoCanvasMatrixPaint acmp(this, matrix, paint, picture->width(), picture->height());

	if (NULL != picture->fData.get()) {
	// Disable the BBH for the old path so all the draw calls
	// will be seen. The stock SkPicture::draw method can't be
	// invoked since it just uses a vanilla SkPicturePlayback.
	SkPicturePlayback playback(picture);
	playback.setUseBBH(false);
	playback.draw(this, NULL);
	} else {
	// Since we know this is the SkRecord path we can just call
	// SkPicture::draw.
	picture->draw(this);
	}
	}

	private:
	typedef SkCanvas INHERITED;
	};

	// GatherGPUInfo is only intended to be called within the context of SkGpuDevice's
	// EXPERIMENTAL_optimize method.
	void GatherGPUInfo(const SkPicture* pict, GPUAccelData* accelData) {
	if (NULL == pict \|\| 0 == pict->width() \|\| 0 == pict->height()) {
	return ;
	}

	// BBH-based rendering doesn't re-issue many of the operations the gather
	// process cares about (e.g., saves and restores) so it must be disabled.
	SkPicturePlayback playback(pict);
	playback.setUseBBH(false);

	GrGatherDevice device(pict->width(), pict->height(), &playback, accelData, 0);
	GrGatherCanvas canvas(&device);

	canvas.clipRect(SkRect::MakeWH(SkIntToScalar(pict->width()),
	SkIntToScalar(pict->height())),
	SkRegion::kIntersect_Op, false);
	playback.draw(&canvas, NULL);
	}