src/gpu/GrDrawTarget.h - platform/external/skia - Gitiles

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED

 #include "GrClip.h"
 #include "GrClipMaskManager.h"
 #include "GrContext.h"
 #include "GrPathProcessor.h"
 #include "GrPrimitiveProcessor.h"
 #include "GrIndexBuffer.h"
 #include "GrPathRendering.h"
 #include "GrPipelineBuilder.h"
 #include "GrPipeline.h"
 #include "GrVertexBuffer.h"
 #include "GrXferProcessor.h"

 #include "batches/GrDrawBatch.h"

 #include "SkClipStack.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkStringUtils.h"
 #include "SkStrokeRec.h"
 #include "SkTArray.h"
 #include "SkTLazy.h"
 #include "SkTypes.h"
 #include "SkXfermode.h"

 //#define ENABLE_MDB 1

 class GrAuditTrail;
 class GrBatch;
 class GrClip;
 class GrCaps;
 class GrPath;
 class GrDrawPathBatchBase;

 class GrDrawTarget final : public SkRefCnt {
 public:
     /** Options for GrDrawTarget behavior. */
     struct Options {
         Options () : fClipBatchToBounds(false), fDrawBatchBounds(false), fMaxBatchLookback(-1) {}
         bool fClipBatchToBounds;
         bool fDrawBatchBounds;
         int  fMaxBatchLookback;
     };

     GrDrawTarget(GrRenderTarget*, GrGpu*, GrResourceProvider*, GrAuditTrail*, const Options&);

     ~GrDrawTarget() override;

     void makeClosed() {
         // We only close drawTargets When MDB is enabled. When MDB is disabled there is only
         // ever one drawTarget and all calls will be funnelled into it.
 #ifdef ENABLE_MDB
         this->setFlag(kClosed_Flag);
 #endif
     }
     bool isClosed() const { return this->isSetFlag(kClosed_Flag); }

     // TODO: this entry point is only needed in the non-MDB world. Remove when
     // we make the switch to MDB
     void clearRT() { fRenderTarget = nullptr; }

     /*
      * Notify this drawTarget that it relies on the contents of 'dependedOn'
      */
     void addDependency(GrSurface* dependedOn);

     /*
      * Does this drawTarget depend on 'dependedOn'?
      */
     bool dependsOn(GrDrawTarget* dependedOn) const {
         return fDependencies.find(dependedOn) >= 0;
     }

     /*
      * Dump out the drawTarget dependency DAG
      */
     SkDEBUGCODE(void dump() const;)

     /**
      * Empties the draw buffer of any queued up draws.
      */
     void reset();

     /**
      * Together these two functions flush all queued up draws to the Gpu.
      */
     void prepareBatches(GrBatchFlushState* flushState);
     void drawBatches(GrBatchFlushState* flushState);

     /**
      * Gets the capabilities of the draw target.
      */
     const GrCaps* caps() const { return fGpu->caps(); }

     void drawBatch(const GrPipelineBuilder&, GrDrawBatch*);

     /**
      * Draws path into the stencil buffer. The fill must be either even/odd or
      * winding (not inverse or hairline). It will respect the HW antialias flag
      * on the GrPipelineBuilder (if possible in the 3D API).  Note, we will never have an inverse
      * fill with stencil path
      */
     void stencilPath(const GrPipelineBuilder&, const SkMatrix& viewMatrix, const GrPath*,
                      GrPathRendering::FillType);

     /**
      * Draws a path batch. Fill must not be a hairline. It will respect the HW antialias flag on
      * the GrPipelineBuilder (if possible in the 3D API). This needs to be separate from drawBatch
      * because we install path stencil settings late.
      *
      * TODO: Figure out a better model that allows us to roll this method into drawBatch.
      */
     void drawPathBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawPathBatchBase* batch);

     /**
      * Clear the passed in render target. Ignores the GrPipelineBuilder and clip. Clears the whole
      * thing if rect is nullptr, otherwise just the rect. If canIgnoreRect is set then the entire
      * render target can be optionally cleared.
      */
     void clear(const SkIRect* rect,
                GrColor color,
                bool canIgnoreRect,
                GrRenderTarget* renderTarget);

     /** Discards the contents render target. */
     void discard(GrRenderTarget*);

     /**
      * Copies a pixel rectangle from one surface to another. This call may finalize
      * reserved vertex/index data (as though a draw call was made). The src pixels
      * copied are specified by srcRect. They are copied to a rect of the same
      * size in dst with top left at dstPoint. If the src rect is clipped by the
      * src bounds then  pixel values in the dst rect corresponding to area clipped
      * by the src rect are not overwritten. This method is not guaranteed to succeed
      * depending on the type of surface, configs, etc, and the backend-specific
      * limitations.
      */
     void copySurface(GrSurface* dst,
                      GrSurface* src,
                      const SkIRect& srcRect,
                      const SkIPoint& dstPoint);

     /** Provides access to internal functions to GrClipMaskManager without friending all of
         GrDrawTarget to CMM. */
     class CMMAccess {
     public:
         CMMAccess(GrDrawTarget* drawTarget) : fDrawTarget(drawTarget) {}
     private:
         void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) const {
             fDrawTarget->clearStencilClip(rect, insideClip, rt);
         }

         GrContext* context() const { return fDrawTarget->fContext; }
         GrResourceProvider* resourceProvider() const { return fDrawTarget->fResourceProvider; }
         GrDrawTarget* fDrawTarget;
         friend class GrClipMaskManager;
     };

     const CMMAccess cmmAccess() { return CMMAccess(this); }

     GrAuditTrail* getAuditTrail() const { return fAuditTrail; }

 private:
     friend class GrDrawingManager; // for resetFlag & TopoSortTraits

     enum Flags {
         kClosed_Flag    = 0x01,   //!< This drawTarget can't accept any more batches

         kWasOutput_Flag = 0x02,   //!< Flag for topological sorting
         kTempMark_Flag  = 0x04,   //!< Flag for topological sorting
     };

     void setFlag(uint32_t flag) {
         fFlags |= flag;
     }

     void resetFlag(uint32_t flag) {
         fFlags &= ~flag;
     }

     bool isSetFlag(uint32_t flag) const {
         return SkToBool(fFlags & flag);
     }

     struct TopoSortTraits {
         static void Output(GrDrawTarget* dt, int /* index */) {
             dt->setFlag(GrDrawTarget::kWasOutput_Flag);
         }
         static bool WasOutput(const GrDrawTarget* dt) {
             return dt->isSetFlag(GrDrawTarget::kWasOutput_Flag);
         }
         static void SetTempMark(GrDrawTarget* dt) {
             dt->setFlag(GrDrawTarget::kTempMark_Flag);
         }
         static void ResetTempMark(GrDrawTarget* dt) {
             dt->resetFlag(GrDrawTarget::kTempMark_Flag);
         }
         static bool IsTempMarked(const GrDrawTarget* dt) {
             return dt->isSetFlag(GrDrawTarget::kTempMark_Flag);
         }
         static int NumDependencies(const GrDrawTarget* dt) {
             return dt->fDependencies.count();
         }
         static GrDrawTarget* Dependency(GrDrawTarget* dt, int index) {
             return dt->fDependencies[index];
         }
     };

     void recordBatch(GrBatch*);
     bool installPipelineInDrawBatch(const GrPipelineBuilder* pipelineBuilder,
                                     const GrScissorState* scissor,
                                     GrDrawBatch* batch);

     // Makes a copy of the dst if it is necessary for the draw. Returns false if a copy is required
     // but couldn't be made. Otherwise, returns true.  This method needs to be protected because it
     // needs to be accessed by GLPrograms to setup a correct drawstate
     bool setupDstReadIfNecessary(const GrPipelineBuilder&,
         const GrPipelineOptimizations& optimizations,
         GrXferProcessor::DstTexture*,
         const SkRect& batchBounds);

     // Check to see if this set of draw commands has been sent out
     void getPathStencilSettingsForFilltype(GrPathRendering::FillType,
                                            const GrStencilAttachment*,
                                            GrStencilSettings*);
     bool setupClip(const GrPipelineBuilder&,
                            GrPipelineBuilder::AutoRestoreFragmentProcessorState*,
                            GrPipelineBuilder::AutoRestoreStencil*,
                            GrScissorState*,
                            const SkRect* devBounds);

     void addDependency(GrDrawTarget* dependedOn);

     // Used only by CMM.
     void clearStencilClip(const SkIRect&, bool insideClip, GrRenderTarget*);

     SkSTArray<256, SkAutoTUnref<GrBatch>, true> fBatches;
     SkAutoTDelete<GrClipMaskManager>            fClipMaskManager;
     // The context is only in service of the clip mask manager, remove once CMM doesn't need this.
     GrContext*                                  fContext;
     GrGpu*                                      fGpu;
     GrResourceProvider*                         fResourceProvider;
     GrAuditTrail*                               fAuditTrail;

     SkDEBUGCODE(int                             fDebugID;)
     uint32_t                                    fFlags;

     // 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
     SkTDArray<GrDrawTarget*>                    fDependencies;
     GrRenderTarget*                             fRenderTarget;

     bool                                        fDrawBatchBounds;
     int                                         fMaxBatchLookback;

     typedef SkRefCnt INHERITED;
 };

 #endif
	/*
	* Copyright 2010 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#ifndef GrDrawTarget_DEFINED
	#define GrDrawTarget_DEFINED

	#include "GrClip.h"
	#include "GrClipMaskManager.h"
	#include "GrContext.h"
	#include "GrPathProcessor.h"
	#include "GrPrimitiveProcessor.h"
	#include "GrIndexBuffer.h"
	#include "GrPathRendering.h"
	#include "GrPipelineBuilder.h"
	#include "GrPipeline.h"
	#include "GrVertexBuffer.h"
	#include "GrXferProcessor.h"

	#include "batches/GrDrawBatch.h"

	#include "SkClipStack.h"
	#include "SkMatrix.h"
	#include "SkPath.h"
	#include "SkStringUtils.h"
	#include "SkStrokeRec.h"
	#include "SkTArray.h"
	#include "SkTLazy.h"
	#include "SkTypes.h"
	#include "SkXfermode.h"

	//#define ENABLE_MDB 1

	class GrAuditTrail;
	class GrBatch;
	class GrClip;
	class GrCaps;
	class GrPath;
	class GrDrawPathBatchBase;

	class GrDrawTarget final : public SkRefCnt {
	public:
	/** Options for GrDrawTarget behavior. */
	struct Options {
	Options () : fClipBatchToBounds(false), fDrawBatchBounds(false), fMaxBatchLookback(-1) {}
	bool fClipBatchToBounds;
	bool fDrawBatchBounds;
	int fMaxBatchLookback;
	};

	GrDrawTarget(GrRenderTarget, GrGpu, GrResourceProvider, GrAuditTrail, const Options&);

	~GrDrawTarget() override;

	void makeClosed() {
	// We only close drawTargets When MDB is enabled. When MDB is disabled there is only
	// ever one drawTarget and all calls will be funnelled into it.
	#ifdef ENABLE_MDB
	this->setFlag(kClosed_Flag);
	#endif
	}
	bool isClosed() const { return this->isSetFlag(kClosed_Flag); }

	// TODO: this entry point is only needed in the non-MDB world. Remove when
	// we make the switch to MDB
	void clearRT() { fRenderTarget = nullptr; }

	/*
	* Notify this drawTarget that it relies on the contents of 'dependedOn'
	*/
	void addDependency(GrSurface* dependedOn);

	/*
	* Does this drawTarget depend on 'dependedOn'?
	*/
	bool dependsOn(GrDrawTarget* dependedOn) const {
	return fDependencies.find(dependedOn) >= 0;
	}

	/*
	* Dump out the drawTarget dependency DAG
	*/
	SkDEBUGCODE(void dump() const;)

	/**
	* Empties the draw buffer of any queued up draws.
	*/
	void reset();

	/**
	* Together these two functions flush all queued up draws to the Gpu.
	*/
	void prepareBatches(GrBatchFlushState* flushState);
	void drawBatches(GrBatchFlushState* flushState);

	/**
	* Gets the capabilities of the draw target.
	*/
	const GrCaps* caps() const { return fGpu->caps(); }

	void drawBatch(const GrPipelineBuilder&, GrDrawBatch*);

	/**
	* Draws path into the stencil buffer. The fill must be either even/odd or
	* winding (not inverse or hairline). It will respect the HW antialias flag
	* on the GrPipelineBuilder (if possible in the 3D API). Note, we will never have an inverse
	* fill with stencil path
	*/
	void stencilPath(const GrPipelineBuilder&, const SkMatrix& viewMatrix, const GrPath*,
	GrPathRendering::FillType);

	/**
	* Draws a path batch. Fill must not be a hairline. It will respect the HW antialias flag on
	* the GrPipelineBuilder (if possible in the 3D API). This needs to be separate from drawBatch
	* because we install path stencil settings late.
	*
	* TODO: Figure out a better model that allows us to roll this method into drawBatch.
	*/
	void drawPathBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawPathBatchBase* batch);

	/**
	* Clear the passed in render target. Ignores the GrPipelineBuilder and clip. Clears the whole
	* thing if rect is nullptr, otherwise just the rect. If canIgnoreRect is set then the entire
	* render target can be optionally cleared.
	*/
	void clear(const SkIRect* rect,
	GrColor color,
	bool canIgnoreRect,
	GrRenderTarget* renderTarget);

	/** Discards the contents render target. */
	void discard(GrRenderTarget*);

	/**
	* Copies a pixel rectangle from one surface to another. This call may finalize
	* reserved vertex/index data (as though a draw call was made). The src pixels
	* copied are specified by srcRect. They are copied to a rect of the same
	* size in dst with top left at dstPoint. If the src rect is clipped by the
	* src bounds then pixel values in the dst rect corresponding to area clipped
	* by the src rect are not overwritten. This method is not guaranteed to succeed
	* depending on the type of surface, configs, etc, and the backend-specific
	* limitations.
	*/
	void copySurface(GrSurface* dst,
	GrSurface* src,
	const SkIRect& srcRect,
	const SkIPoint& dstPoint);

	/** Provides access to internal functions to GrClipMaskManager without friending all of
	GrDrawTarget to CMM. */
	class CMMAccess {
	public:
	CMMAccess(GrDrawTarget* drawTarget) : fDrawTarget(drawTarget) {}
	private:
	void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) const {
	fDrawTarget->clearStencilClip(rect, insideClip, rt);
	}

	GrContext* context() const { return fDrawTarget->fContext; }
	GrResourceProvider* resourceProvider() const { return fDrawTarget->fResourceProvider; }
	GrDrawTarget* fDrawTarget;
	friend class GrClipMaskManager;
	};

	const CMMAccess cmmAccess() { return CMMAccess(this); }

	GrAuditTrail* getAuditTrail() const { return fAuditTrail; }

	private:
	friend class GrDrawingManager; // for resetFlag & TopoSortTraits

	enum Flags {
	kClosed_Flag = 0x01, //!< This drawTarget can't accept any more batches

	kWasOutput_Flag = 0x02, //!< Flag for topological sorting
	kTempMark_Flag = 0x04, //!< Flag for topological sorting
	};

	void setFlag(uint32_t flag) {
	fFlags \|= flag;
	}

	void resetFlag(uint32_t flag) {
	fFlags &= ~flag;
	}

	bool isSetFlag(uint32_t flag) const {
	return SkToBool(fFlags & flag);
	}

	struct TopoSortTraits {
	static void Output(GrDrawTarget* dt, int /* index */) {
	dt->setFlag(GrDrawTarget::kWasOutput_Flag);
	}
	static bool WasOutput(const GrDrawTarget* dt) {
	return dt->isSetFlag(GrDrawTarget::kWasOutput_Flag);
	}
	static void SetTempMark(GrDrawTarget* dt) {
	dt->setFlag(GrDrawTarget::kTempMark_Flag);
	}
	static void ResetTempMark(GrDrawTarget* dt) {
	dt->resetFlag(GrDrawTarget::kTempMark_Flag);
	}
	static bool IsTempMarked(const GrDrawTarget* dt) {
	return dt->isSetFlag(GrDrawTarget::kTempMark_Flag);
	}
	static int NumDependencies(const GrDrawTarget* dt) {
	return dt->fDependencies.count();
	}
	static GrDrawTarget* Dependency(GrDrawTarget* dt, int index) {
	return dt->fDependencies[index];
	}
	};

	void recordBatch(GrBatch*);
	bool installPipelineInDrawBatch(const GrPipelineBuilder* pipelineBuilder,
	const GrScissorState* scissor,
	GrDrawBatch* batch);

	// Makes a copy of the dst if it is necessary for the draw. Returns false if a copy is required
	// but couldn't be made. Otherwise, returns true. This method needs to be protected because it
	// needs to be accessed by GLPrograms to setup a correct drawstate
	bool setupDstReadIfNecessary(const GrPipelineBuilder&,
	const GrPipelineOptimizations& optimizations,
	GrXferProcessor::DstTexture*,
	const SkRect& batchBounds);

	// Check to see if this set of draw commands has been sent out
	void getPathStencilSettingsForFilltype(GrPathRendering::FillType,
	const GrStencilAttachment*,
	GrStencilSettings*);
	bool setupClip(const GrPipelineBuilder&,
	GrPipelineBuilder::AutoRestoreFragmentProcessorState*,
	GrPipelineBuilder::AutoRestoreStencil*,
	GrScissorState*,
	const SkRect* devBounds);

	void addDependency(GrDrawTarget* dependedOn);

	// Used only by CMM.
	void clearStencilClip(const SkIRect&, bool insideClip, GrRenderTarget*);

	SkSTArray<256, SkAutoTUnref<GrBatch>, true> fBatches;
	SkAutoTDelete<GrClipMaskManager> fClipMaskManager;
	// The context is only in service of the clip mask manager, remove once CMM doesn't need this.
	GrContext* fContext;
	GrGpu* fGpu;
	GrResourceProvider* fResourceProvider;
	GrAuditTrail* fAuditTrail;

	SkDEBUGCODE(int fDebugID;)
	uint32_t fFlags;

	// 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
	SkTDArray<GrDrawTarget*> fDependencies;
	GrRenderTarget* fRenderTarget;

	bool fDrawBatchBounds;
	int fMaxBatchLookback;

	typedef SkRefCnt INHERITED;
	};

	#endif