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* 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 GrContext_DEFINED
#define GrContext_DEFINED
#include "GrCaps.h"
#include "GrClip.h"
#include "GrColor.h"
#include "GrPaint.h"
#include "GrRenderTarget.h"
#include "GrTextureProvider.h"
#include "SkMatrix.h"
#include "SkPathEffect.h"
#include "SkTypes.h"
#include "../private/GrAuditTrail.h"
#include "../private/GrSingleOwner.h"
#include "../private/SkMutex.h"
struct GrBatchAtlasConfig;
class GrBatchFontCache;
struct GrContextOptions;
class GrDrawingManager;
class GrDrawContext;
class GrDrawTarget;
class GrFragmentProcessor;
class GrGpu;
class GrIndexBuffer;
class GrLayerCache;
class GrOvalRenderer;
class GrPath;
class GrPipelineBuilder;
class GrResourceEntry;
class GrResourceCache;
class GrResourceProvider;
class GrTestTarget;
class GrTextBlobCache;
class GrTextContext;
class GrTextureParams;
class GrVertexBuffer;
class GrStrokeInfo;
class GrSwizzle;
class SkTraceMemoryDump;
class SK_API GrContext : public SkRefCnt {
* Creates a GrContext for a backend context.
static GrContext* Create(GrBackend, GrBackendContext, const GrContextOptions& options);
static GrContext* Create(GrBackend, GrBackendContext);
* Only defined in test apps.
static GrContext* CreateMockContext();
virtual ~GrContext();
* The GrContext normally assumes that no outsider is setting state
* within the underlying 3D API's context/device/whatever. This call informs
* the context that the state was modified and it should resend. Shouldn't
* be called frequently for good performance.
* The flag bits, state, is dpendent on which backend is used by the
* context, either GL or D3D (possible in future).
void resetContext(uint32_t state = kAll_GrBackendState);
* Callback function to allow classes to cleanup on GrContext destruction.
* The 'info' field is filled in with the 'info' passed to addCleanUp.
typedef void (*PFCleanUpFunc)(const GrContext* context, void* info);
* Add a function to be called from within GrContext's destructor.
* This gives classes a chance to free resources held on a per context basis.
* The 'info' parameter will be stored and passed to the callback function.
void addCleanUp(PFCleanUpFunc cleanUp, void* info) {
CleanUpData* entry = fCleanUpData.push();
entry->fFunc = cleanUp;
entry->fInfo = info;
* Abandons all GPU resources and assumes the underlying backend 3D API
* context is not longer usable. Call this if you have lost the associated
* GPU context, and thus internal texture, buffer, etc. references/IDs are
* now invalid. Should be called even when GrContext is no longer going to
* be used for two reasons:
* 1) ~GrContext will not try to free the objects in the 3D API.
* 2) Any GrGpuResources created by this GrContext that outlive
* will be marked as invalid (GrGpuResource::wasDestroyed()) and
* when they're destroyed no 3D API calls will be made.
* Content drawn since the last GrContext::flush() may be lost. After this
* function is called the only valid action on the GrContext or
* GrGpuResources it created is to destroy them.
void abandonContext();
// Resource Cache
* Return the current GPU resource cache limits.
* @param maxResources If non-null, returns maximum number of resources that
* can be held in the cache.
* @param maxResourceBytes If non-null, returns maximum number of bytes of
* video memory that can be held in the cache.
void getResourceCacheLimits(int* maxResources, size_t* maxResourceBytes) const;
* Gets the current GPU resource cache usage.
* @param resourceCount If non-null, returns the number of resources that are held in the
* cache.
* @param maxResourceBytes If non-null, returns the total number of bytes of video memory held
* in the cache.
void getResourceCacheUsage(int* resourceCount, size_t* resourceBytes) const;
* Specify the GPU resource cache limits. If the current cache exceeds either
* of these, it will be purged (LRU) to keep the cache within these limits.
* @param maxResources The maximum number of resources that can be held in
* the cache.
* @param maxResourceBytes The maximum number of bytes of video memory
* that can be held in the cache.
void setResourceCacheLimits(int maxResources, size_t maxResourceBytes);
GrTextureProvider* textureProvider() { return fTextureProvider; }
const GrTextureProvider* textureProvider() const { return fTextureProvider; }
* Frees GPU created by the context. Can be called to reduce GPU memory
* pressure.
void freeGpuResources();
* Purge all the unlocked resources from the cache.
* This entry point is mainly meant for timing texture uploads
* and is not defined in normal builds of Skia.
void purgeAllUnlockedResources();
/** Access the context capabilities */
const GrCaps* caps() const { return fCaps; }
* Returns the recommended sample count for a render target when using this
* context.
* @param config the configuration of the render target.
* @param dpi the display density in dots per inch.
* @return sample count that should be perform well and have good enough
* rendering quality for the display. Alternatively returns 0 if
* MSAA is not supported or recommended to be used by default.
int getRecommendedSampleCount(GrPixelConfig config, SkScalar dpi) const;
* Returns a helper object to orchestrate draws.
* Callers assume the creation ref of the drawContext
* NULL will be returned if the context has been abandoned.
* @param rt the render target receiving the draws
* @param surfaceProps the surface properties (mainly defines text drawing)
* @return a draw context
GrDrawContext* drawContext(GrRenderTarget* rt, const SkSurfaceProps* surfaceProps = NULL);
// Misc.
* Flags that affect flush() behavior.
enum FlushBits {
* A client may reach a point where it has partially rendered a frame
* through a GrContext that it knows the user will never see. This flag
* causes the flush to skip submission of deferred content to the 3D API
* during the flush.
kDiscard_FlushBit = 0x2,
* Call to ensure all drawing to the context has been issued to the
* underlying 3D API.
* @param flagsBitfield flags that control the flushing behavior. See
* FlushBits.
void flush(int flagsBitfield = 0);
void flushIfNecessary() {
if (fFlushToReduceCacheSize || this->caps()->immediateFlush()) {
* These flags can be used with the read/write pixels functions below.
enum PixelOpsFlags {
/** The GrContext will not be flushed before the surface read or write. This means that
the read or write may occur before previous draws have executed. */
kDontFlush_PixelOpsFlag = 0x1,
/** Any surface writes should be flushed to the backend 3D API after the surface operation
is complete */
kFlushWrites_PixelOp = 0x2,
/** The src for write or dst read is unpremultiplied. This is only respected if both the
config src and dst configs are an RGBA/BGRA 8888 format. */
kUnpremul_PixelOpsFlag = 0x4,
* Reads a rectangle of pixels from a surface.
* @param surface the surface to read from.
* @param left left edge of the rectangle to read (inclusive)
* @param top top edge of the rectangle to read (inclusive)
* @param width width of rectangle to read in pixels.
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
* @param rowBytes number of bytes bewtween consecutive rows. Zero means rows are tightly
* packed.
* @param pixelOpsFlags see PixelOpsFlags enum above.
* @return true if the read succeeded, false if not. The read can fail because of an unsupported
* pixel configs
bool readSurfacePixels(GrSurface* surface,
int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes = 0,
uint32_t pixelOpsFlags = 0);
* Writes a rectangle of pixels to a surface.
* @param surface the surface to write to.
* @param left left edge of the rectangle to write (inclusive)
* @param top top edge of the rectangle to write (inclusive)
* @param width width of rectangle to write in pixels.
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read pixels from
* @param rowBytes number of bytes between consecutive rows. Zero
* means rows are tightly packed.
* @param pixelOpsFlags see PixelOpsFlags enum above.
* @return true if the write succeeded, false if not. The write can fail because of an
* unsupported combination of surface and src configs.
bool writeSurfacePixels(GrSurface* surface,
int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes,
uint32_t pixelOpsFlags = 0);
* Copies a rectangle of texels from src to dst.
* bounds.
* @param dst the surface to copy to.
* @param src the surface to copy from.
* @param srcRect the rectangle of the src that should be copied.
* @param dstPoint the translation applied when writing the srcRect's pixels to the dst.
bool copySurface(GrSurface* dst,
GrSurface* src,
const SkIRect& srcRect,
const SkIPoint& dstPoint);
/** Helper that copies the whole surface but fails when the two surfaces are not identically
sized. */
bool copySurface(GrSurface* dst, GrSurface* src) {
return this->copySurface(dst, src, SkIRect::MakeWH(dst->width(), dst->height()),
* After this returns any pending writes to the surface will have been issued to the backend 3D API.
void flushSurfaceWrites(GrSurface* surface);
* Finalizes all pending reads and writes to the surface and also performs an MSAA resolve
* if necessary.
* It is not necessary to call this before reading the render target via Skia/GrContext.
* GrContext will detect when it must perform a resolve before reading pixels back from the
* surface or using it as a texture.
void prepareSurfaceForExternalIO(GrSurface*);
* An ID associated with this context, guaranteed to be unique.
uint32_t uniqueID() { return fUniqueID; }
// Functions intended for internal use only.
GrGpu* getGpu() { return fGpu; }
const GrGpu* getGpu() const { return fGpu; }
GrBatchFontCache* getBatchFontCache() { return fBatchFontCache; }
GrLayerCache* getLayerCache() { return fLayerCache.get(); }
GrTextBlobCache* getTextBlobCache() { return fTextBlobCache; }
bool abandoned() const;
GrResourceProvider* resourceProvider() { return fResourceProvider; }
const GrResourceProvider* resourceProvider() const { return fResourceProvider; }
GrResourceCache* getResourceCache() { return fResourceCache; }
// Called by tests that draw directly to the context via GrDrawTarget
void getTestTarget(GrTestTarget*, GrRenderTarget* rt);
/** Reset GPU stats */
void resetGpuStats() const ;
/** Prints cache stats to the string if GR_CACHE_STATS == 1. */
void dumpCacheStats(SkString*) const;
void dumpCacheStatsKeyValuePairs(SkTArray<SkString>* keys, SkTArray<double>* values) const;
void printCacheStats() const;
/** Prints GPU stats to the string if GR_GPU_STATS == 1. */
void dumpGpuStats(SkString*) const;
void dumpGpuStatsKeyValuePairs(SkTArray<SkString>* keys, SkTArray<double>* values) const;
void printGpuStats() const;
/** Specify the TextBlob cache limit. If the current cache exceeds this limit it will purge.
this is for testing only */
void setTextBlobCacheLimit_ForTesting(size_t bytes);
/** Specify the sizes of the GrAtlasTextContext atlases. The configs pointer below should be
to an array of 3 entries */
void setTextContextAtlasSizes_ForTesting(const GrBatchAtlasConfig* configs);
/** Enumerates all cached GPU resources and dumps their memory to traceMemoryDump. */
void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const;
/** Get pointer to atlas texture for given mask format */
GrTexture* getFontAtlasTexture(GrMaskFormat format);
GrAuditTrail* getAuditTrail() { return &fAuditTrail; }
/** This is only useful for debug purposes */
SkDEBUGCODE(GrSingleOwner* debugSingleOwner() const { return &fSingleOwner; } )
GrGpu* fGpu;
const GrCaps* fCaps;
GrResourceCache* fResourceCache;
// this union exists because the inheritance of GrTextureProvider->GrResourceProvider
// is in a private header.
union {
GrResourceProvider* fResourceProvider;
GrTextureProvider* fTextureProvider;
GrBatchFontCache* fBatchFontCache;
SkAutoTDelete<GrLayerCache> fLayerCache;
SkAutoTDelete<GrTextBlobCache> fTextBlobCache;
// Set by OverbudgetCB() to request that GrContext flush before exiting a draw.
bool fFlushToReduceCacheSize;
bool fDidTestPMConversions;
int fPMToUPMConversion;
int fUPMToPMConversion;
// The sw backend may call GrContext::readSurfacePixels on multiple threads
// We may transfer the responsibilty for using a mutex to the sw backend
// when there are fewer code paths that lead to a readSurfacePixels call
// from the sw backend. readSurfacePixels is reentrant in one case - when performing
// the PM conversions test. To handle this we do the PM conversions test outside
// of fReadPixelsMutex and use a separate mutex to guard it. When it re-enters
// readSurfacePixels it will grab fReadPixelsMutex and release it before the outer
// readSurfacePixels proceeds to grab it.
// TODO: Stop pretending to make GrContext thread-safe for sw rasterization and provide
// a mechanism to make a SkPicture safe for multithreaded sw rasterization.
SkMutex fReadPixelsMutex;
SkMutex fTestPMConversionsMutex;
// In debug builds we guard against improper thread handling
// This guard is passed to the GrDrawingManager and, from there to all the
// GrDrawContexts. It is also passed to the GrTextureProvider and SkGpuDevice.
mutable GrSingleOwner fSingleOwner;
struct CleanUpData {
PFCleanUpFunc fFunc;
void* fInfo;
SkTDArray<CleanUpData> fCleanUpData;
const uint32_t fUniqueID;
SkAutoTDelete<GrDrawingManager> fDrawingManager;
GrAuditTrail fAuditTrail;
// TODO: have the CMM use drawContexts and rm this friending
friend class GrClipMaskManager; // the CMM is friended just so it can call 'drawingManager'
friend class GrDrawingManager; // for access to drawingManager for ProgramUnitTest
GrDrawingManager* drawingManager() { return fDrawingManager; }
GrContext(); // init must be called after the constructor.
bool init(GrBackend, GrBackendContext, const GrContextOptions& options);
void initMockContext();
void initCommon(const GrContextOptions&);
* These functions create premul <-> unpremul effects if it is possible to generate a pair
* of effects that make a readToUPM->writeToPM->readToUPM cycle invariant. Otherwise, they
* return NULL. They also can perform a swizzle as part of the draw.
const GrFragmentProcessor* createPMToUPMEffect(GrTexture*, const GrSwizzle&,
const SkMatrix&) const;
const GrFragmentProcessor* createUPMToPMEffect(GrTexture*, const GrSwizzle&,
const SkMatrix&) const;
/** Called before either of the above two functions to determine the appropriate fragment
processors for conversions. This must be called by readSurfacePixels before a mutex is
taken, since testingvPM conversions itself will call readSurfacePixels */
void testPMConversionsIfNecessary(uint32_t flags);
/** Returns true if we've already determined that createPMtoUPMEffect and createUPMToPMEffect
will fail. In such cases fall back to SW conversion. */
bool didFailPMUPMConversionTest() const;
* This callback allows the resource cache to callback into the GrContext
* when the cache is still over budget after a purge.
static void OverBudgetCB(void* data);
* A callback similar to the above for use by the TextBlobCache
* TODO move textblob draw calls below context so we can use the call above.
static void TextBlobCacheOverBudgetCB(void* data);
typedef SkRefCnt INHERITED;