2 * Copyright 2010 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef GrContext_DEFINED
9 #define GrContext_DEFINED
11 #include "GrClipData.h"
14 #include "GrPathRendererChain.h"
15 #include "GrRenderTarget.h"
16 #include "GrTexture.h"
18 #include "SkPathEffect.h"
21 class GrAARectRenderer;
22 class GrAutoScratchTexture;
26 class GrFragmentProcessor;
28 class GrGpuTraceMarker;
30 class GrIndexBufferAllocPool;
31 class GrInOrderDrawBuffer;
36 class GrResourceEntry;
37 class GrResourceCache;
38 class GrResourceCache2;
39 class GrStencilBuffer;
42 class GrTextureParams;
44 class GrVertexBufferAllocPool;
46 class GrSoftwarePathRenderer;
49 class SK_API GrContext : public SkRefCnt {
51 SK_DECLARE_INST_COUNT(GrContext)
54 Options() : fDrawPathToCompressedTexture(false) { }
57 // May be removed in the future, or may become standard depending
58 // on the outcomes of a variety of internal tests.
59 bool fDrawPathToCompressedTexture;
63 * Creates a GrContext for a backend context.
65 static GrContext* Create(GrBackend, GrBackendContext, const Options* opts = NULL);
70 * The GrContext normally assumes that no outsider is setting state
71 * within the underlying 3D API's context/device/whatever. This call informs
72 * the context that the state was modified and it should resend. Shouldn't
73 * be called frequently for good performance.
74 * The flag bits, state, is dpendent on which backend is used by the
75 * context, either GL or D3D (possible in future).
77 void resetContext(uint32_t state = kAll_GrBackendState);
80 * Callback function to allow classes to cleanup on GrContext destruction.
81 * The 'info' field is filled in with the 'info' passed to addCleanUp.
83 typedef void (*PFCleanUpFunc)(const GrContext* context, void* info);
86 * Add a function to be called from within GrContext's destructor.
87 * This gives classes a chance to free resources held on a per context basis.
88 * The 'info' parameter will be stored and passed to the callback function.
90 void addCleanUp(PFCleanUpFunc cleanUp, void* info) {
91 CleanUpData* entry = fCleanUpData.push();
93 entry->fFunc = cleanUp;
98 * Abandons all GPU resources and assumes the underlying backend 3D API
99 * context is not longer usable. Call this if you have lost the associated
100 * GPU context, and thus internal texture, buffer, etc. references/IDs are
101 * now invalid. Should be called even when GrContext is no longer going to
102 * be used for two reasons:
103 * 1) ~GrContext will not try to free the objects in the 3D API.
104 * 2) Any GrGpuResources created by this GrContext that outlive
105 * will be marked as invalid (GrGpuResource::wasDestroyed()) and
106 * when they're destroyed no 3D API calls will be made.
107 * Content drawn since the last GrContext::flush() may be lost. After this
108 * function is called the only valid action on the GrContext or
109 * GrGpuResources it created is to destroy them.
111 void abandonContext();
112 void contextDestroyed() { this->abandonContext(); } // legacy alias
114 ///////////////////////////////////////////////////////////////////////////
118 * Return the current GPU resource cache limits.
120 * @param maxResources If non-null, returns maximum number of resources that
121 * can be held in the cache.
122 * @param maxResourceBytes If non-null, returns maximum number of bytes of
123 * video memory that can be held in the cache.
125 void getResourceCacheLimits(int* maxResources, size_t* maxResourceBytes) const;
126 SK_ATTR_DEPRECATED("This function has been renamed to getResourceCacheLimits().")
127 void getTextureCacheLimits(int* maxTextures, size_t* maxTextureBytes) const {
128 this->getResourceCacheLimits(maxTextures, maxTextureBytes);
132 * Gets the current GPU resource cache usage.
134 * @param resourceCount If non-null, returns the number of resources that are held in the
136 * @param maxResourceBytes If non-null, returns the total number of bytes of video memory held
139 void getResourceCacheUsage(int* resourceCount, size_t* resourceBytes) const;
141 SK_ATTR_DEPRECATED("Use getResourceCacheUsage().")
142 size_t getGpuTextureCacheBytes() const {
144 this->getResourceCacheUsage(NULL, &bytes);
148 SK_ATTR_DEPRECATED("Use getResourceCacheUsage().")
149 int getGpuTextureCacheResourceCount() const {
151 this->getResourceCacheUsage(&count, NULL);
156 * Specify the GPU resource cache limits. If the current cache exceeds either
157 * of these, it will be purged (LRU) to keep the cache within these limits.
159 * @param maxResources The maximum number of resources that can be held in
161 * @param maxResourceBytes The maximum number of bytes of video memory
162 * that can be held in the cache.
164 void setResourceCacheLimits(int maxResources, size_t maxResourceBytes);
165 SK_ATTR_DEPRECATED("This function has been renamed to setResourceCacheLimits().")
166 void setTextureCacheLimits(int maxTextures, size_t maxTextureBytes) {
167 this->setResourceCacheLimits(maxTextures, maxTextureBytes);
171 * Frees GPU created by the context. Can be called to reduce GPU memory
174 void freeGpuResources();
177 * This method should be called whenever a GrResource is unreffed or
178 * switched from exclusive to non-exclusive. This
179 * gives the resource cache a chance to discard unneeded resources.
180 * Note: this entry point will be removed once totally ref-driven
181 * cache maintenance is implemented.
186 * Purge all the unlocked resources from the cache.
187 * This entry point is mainly meant for timing texture uploads
188 * and is not defined in normal builds of Skia.
190 void purgeAllUnlockedResources();
193 * Stores a custom resource in the cache, based on the specified key.
195 void addResourceToCache(const GrResourceKey&, GrGpuResource*);
198 * Finds a resource in the cache, based on the specified key. This is intended for use in
199 * conjunction with addResourceToCache(). The return value will be NULL if not found. The
200 * caller must balance with a call to unref().
202 GrGpuResource* findAndRefCachedResource(const GrResourceKey&);
205 * Creates a new text rendering context that is optimal for the
206 * render target and the context. Caller assumes the ownership
207 * of the returned object. The returned object must be deleted
208 * before the context is destroyed.
210 GrTextContext* createTextContext(GrRenderTarget*,
211 const SkDeviceProperties&,
212 bool enableDistanceFieldFonts);
214 ///////////////////////////////////////////////////////////////////////////
218 * Creates a new entry, based on the specified key and texture and returns it. The caller owns a
219 * ref on the returned texture which must be balanced by a call to unref.
221 * @param params The texture params used to draw a texture may help determine
222 * the cache entry used. (e.g. different versions may exist
223 * for different wrap modes on GPUs with limited NPOT
224 * texture support). NULL implies clamp wrap modes.
225 * @param desc Description of the texture properties.
226 * @param cacheID Cache-specific properties (e.g., texture gen ID)
227 * @param srcData Pointer to the pixel values.
228 * @param rowBytes The number of bytes between rows of the texture. Zero
229 * implies tightly packed rows. For compressed pixel configs, this
231 * @param cacheKey (optional) If non-NULL, we'll write the cache key we used to cacheKey.
233 GrTexture* createTexture(const GrTextureParams* params,
234 const GrTextureDesc& desc,
235 const GrCacheID& cacheID,
238 GrResourceKey* cacheKey = NULL);
240 * Search for an entry based on key and dimensions. If found, ref it and return it. The return
241 * value will be NULL if not found. The caller must balance with a call to unref.
243 * @param desc Description of the texture properties.
244 * @param cacheID Cache-specific properties (e.g., texture gen ID)
245 * @param params The texture params used to draw a texture may help determine
246 * the cache entry used. (e.g. different versions may exist
247 * for different wrap modes on GPUs with limited NPOT
248 * texture support). NULL implies clamp wrap modes.
250 GrTexture* findAndRefTexture(const GrTextureDesc& desc,
251 const GrCacheID& cacheID,
252 const GrTextureParams* params);
254 * Determines whether a texture is in the cache. If the texture is found it
255 * will not be locked or returned. This call does not affect the priority of
256 * the texture for deletion.
258 bool isTextureInCache(const GrTextureDesc& desc,
259 const GrCacheID& cacheID,
260 const GrTextureParams* params) const;
263 * Enum that determines how closely a returned scratch texture must match
264 * a provided GrTextureDesc.
266 enum ScratchTexMatch {
268 * Finds a texture that exactly matches the descriptor.
270 kExact_ScratchTexMatch,
272 * Finds a texture that approximately matches the descriptor. Will be
273 * at least as large in width and height as desc specifies. If desc
274 * specifies that texture is a render target then result will be a
275 * render target. If desc specifies a render target and doesn't set the
276 * no stencil flag then result will have a stencil. Format and aa level
279 kApprox_ScratchTexMatch
283 * Returns a texture matching the desc. It's contents are unknown. Subsequent
284 * requests with the same descriptor are not guaranteed to return the same
285 * texture. The same texture is guaranteed not be returned again until it is
286 * unlocked. Call must be balanced with an unlockTexture() call. The caller
287 * owns a ref on the returned texture and must balance with a call to unref.
289 * Textures created by createAndLockTexture() hide the complications of
290 * tiling non-power-of-two textures on APIs that don't support this (e.g.
291 * unextended GLES2). Tiling a NPOT texture created by lockScratchTexture on
292 * such an API will create gaps in the tiling pattern. This includes clamp
293 * mode. (This may be addressed in a future update.)
295 GrTexture* lockAndRefScratchTexture(const GrTextureDesc&, ScratchTexMatch match);
298 * When done with an entry, call unlockScratchTexture(entry) on it, which returns
299 * it to the cache, where it may be purged. This does not unref the texture.
301 void unlockScratchTexture(GrTexture* texture);
304 * Creates a texture that is outside the cache. Does not count against
307 GrTexture* createUncachedTexture(const GrTextureDesc& desc,
312 * Returns true if the specified use of an indexed texture is supported.
313 * Support may depend upon whether the texture params indicate that the
314 * texture will be tiled. Passing NULL for the texture params indicates
317 bool supportsIndex8PixelConfig(const GrTextureParams*,
322 * Return the max width or height of a texture supported by the current GPU.
324 int getMaxTextureSize() const;
327 * Temporarily override the true max texture size. Note: an override
328 * larger then the true max texture size will have no effect.
329 * This entry point is mainly meant for testing texture size dependent
330 * features and is only available if defined outside of Skia (see
333 void setMaxTextureSizeOverride(int maxTextureSizeOverride);
335 ///////////////////////////////////////////////////////////////////////////
339 * Sets the render target.
340 * @param target the render target to set.
342 void setRenderTarget(GrRenderTarget* target) {
343 fRenderTarget.reset(SkSafeRef(target));
347 * Gets the current render target.
348 * @return the currently bound render target.
350 const GrRenderTarget* getRenderTarget() const { return fRenderTarget.get(); }
351 GrRenderTarget* getRenderTarget() { return fRenderTarget.get(); }
354 * Can the provided configuration act as a color render target?
356 bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const;
359 * Return the max width or height of a render target supported by the
362 int getMaxRenderTargetSize() const;
365 * Returns the max sample count for a render target. It will be 0 if MSAA
368 int getMaxSampleCount() const;
371 * Returns the recommended sample count for a render target when using this
374 * @param config the configuration of the render target.
375 * @param dpi the display density in dots per inch.
377 * @return sample count that should be perform well and have good enough
378 * rendering quality for the display. Alternatively returns 0 if
379 * MSAA is not supported or recommended to be used by default.
381 int getRecommendedSampleCount(GrPixelConfig config, SkScalar dpi) const;
383 ///////////////////////////////////////////////////////////////////////////
387 * Wraps an existing texture with a GrTexture object.
389 * OpenGL: if the object is a texture Gr may change its GL texture params
392 * @param desc description of the object to create.
394 * @return GrTexture object or NULL on failure.
396 GrTexture* wrapBackendTexture(const GrBackendTextureDesc& desc);
399 * Wraps an existing render target with a GrRenderTarget object. It is
400 * similar to wrapBackendTexture but can be used to draw into surfaces
401 * that are not also textures (e.g. FBO 0 in OpenGL, or an MSAA buffer that
402 * the client will resolve to a texture).
404 * @param desc description of the object to create.
406 * @return GrTexture object or NULL on failure.
408 GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc);
410 ///////////////////////////////////////////////////////////////////////////
414 * Gets the current transformation matrix.
415 * @return the current matrix.
417 const SkMatrix& getMatrix() const { return fViewMatrix; }
420 * Sets the transformation matrix.
421 * @param m the matrix to set.
423 void setMatrix(const SkMatrix& m) { fViewMatrix = m; }
426 * Sets the current transformation matrix to identity.
428 void setIdentityMatrix() { fViewMatrix.reset(); }
431 * Concats the current matrix. The passed matrix is applied before the
433 * @param m the matrix to concat.
435 void concatMatrix(const SkMatrix& m) { fViewMatrix.preConcat(m); }
438 ///////////////////////////////////////////////////////////////////////////
441 * Gets the current clip.
442 * @return the current clip.
444 const GrClipData* getClip() const { return fClip; }
448 * @param clipData the clip to set.
450 void setClip(const GrClipData* clipData) { fClip = clipData; }
452 ///////////////////////////////////////////////////////////////////////////
456 * Clear the entire or rect of the render target, ignoring any clips.
457 * @param rect the rect to clear or the whole thing if rect is NULL.
458 * @param color the color to clear to.
459 * @param canIgnoreRect allows partial clears to be converted to whole
460 * clears on platforms for which that is cheap
461 * @param target if non-NULL, the render target to clear otherwise clear
462 * the current render target
464 void clear(const SkIRect* rect, GrColor color, bool canIgnoreRect,
465 GrRenderTarget* target = NULL);
468 * Draw everywhere (respecting the clip) with the paint.
470 void drawPaint(const GrPaint& paint);
473 * Draw the rect using a paint.
474 * @param paint describes how to color pixels.
475 * @param strokeInfo the stroke information (width, join, cap), and.
476 * the dash information (intervals, count, phase).
477 * If strokeInfo == NULL, then the rect is filled.
478 * Otherwise, if stroke width == 0, then the stroke
479 * is always a single pixel thick, else the rect is
480 * mitered/beveled stroked based on stroke width.
481 * The rects coords are used to access the paint (through texture matrix)
483 void drawRect(const GrPaint& paint,
485 const GrStrokeInfo* strokeInfo = NULL);
488 * Maps a rect of local coordinates onto the a rect of destination
489 * coordinates. The localRect is stretched over the dstRect. The dstRect is
490 * transformed by the context's matrix. An additional optional matrix can be
491 * provided to transform the local rect.
493 * @param paint describes how to color pixels.
494 * @param dstRect the destination rect to draw.
495 * @param localRect rect of local coordinates to be mapped onto dstRect
496 * @param localMatrix Optional matrix to transform localRect.
498 void drawRectToRect(const GrPaint& paint,
499 const SkRect& dstRect,
500 const SkRect& localRect,
501 const SkMatrix* localMatrix = NULL);
504 * Draw a roundrect using a paint.
506 * @param paint describes how to color pixels.
507 * @param rrect the roundrect to draw
508 * @param strokeInfo the stroke information (width, join, cap) and
509 * the dash information (intervals, count, phase).
511 void drawRRect(const GrPaint& paint, const SkRRect& rrect, const GrStrokeInfo& strokeInfo);
514 * Shortcut for drawing an SkPath consisting of nested rrects using a paint.
515 * Does not support stroking. The result is undefined if outer does not contain
518 * @param paint describes how to color pixels.
519 * @param outer the outer roundrect
520 * @param inner the inner roundrect
522 void drawDRRect(const GrPaint& paint, const SkRRect& outer, const SkRRect& inner);
528 * @param paint describes how to color pixels.
529 * @param path the path to draw
530 * @param strokeInfo the stroke information (width, join, cap) and
531 * the dash information (intervals, count, phase).
533 void drawPath(const GrPaint& paint, const SkPath& path, const GrStrokeInfo& strokeInfo);
536 * Draws vertices with a paint.
538 * @param paint describes how to color pixels.
539 * @param primitiveType primitives type to draw.
540 * @param vertexCount number of vertices.
541 * @param positions array of vertex positions, required.
542 * @param texCoords optional array of texture coordinates used
543 * to access the paint.
544 * @param colors optional array of per-vertex colors, supercedes
545 * the paint's color field.
546 * @param indices optional array of indices. If NULL vertices
547 * are drawn non-indexed.
548 * @param indexCount if indices is non-null then this is the
551 void drawVertices(const GrPaint& paint,
552 GrPrimitiveType primitiveType,
554 const SkPoint positions[],
555 const SkPoint texs[],
556 const GrColor colors[],
557 const uint16_t indices[],
563 * @param paint describes how to color pixels.
564 * @param oval the bounding rect of the oval.
565 * @param strokeInfo the stroke information (width, join, cap) and
566 * the dash information (intervals, count, phase).
568 void drawOval(const GrPaint& paint,
570 const GrStrokeInfo& strokeInfo);
572 ///////////////////////////////////////////////////////////////////////////
576 * Flags that affect flush() behavior.
580 * A client may reach a point where it has partially rendered a frame
581 * through a GrContext that it knows the user will never see. This flag
582 * causes the flush to skip submission of deferred content to the 3D API
585 kDiscard_FlushBit = 0x2,
589 * Call to ensure all drawing to the context has been issued to the
591 * @param flagsBitfield flags that control the flushing behavior. See
594 void flush(int flagsBitfield = 0);
597 * These flags can be used with the read/write pixels functions below.
600 /** The GrContext will not be flushed. This means that the read or write may occur before
601 previous draws have executed. */
602 kDontFlush_PixelOpsFlag = 0x1,
603 /** The src for write or dst read is unpremultiplied. This is only respected if both the
604 config src and dst configs are an RGBA/BGRA 8888 format. */
605 kUnpremul_PixelOpsFlag = 0x2,
609 * Reads a rectangle of pixels from a render target.
610 * @param target the render target to read from. NULL means the current render target.
611 * @param left left edge of the rectangle to read (inclusive)
612 * @param top top edge of the rectangle to read (inclusive)
613 * @param width width of rectangle to read in pixels.
614 * @param height height of rectangle to read in pixels.
615 * @param config the pixel config of the destination buffer
616 * @param buffer memory to read the rectangle into.
617 * @param rowBytes number of bytes bewtween consecutive rows. Zero means rows are tightly
619 * @param pixelOpsFlags see PixelOpsFlags enum above.
621 * @return true if the read succeeded, false if not. The read can fail because of an unsupported
622 * pixel config or because no render target is currently set and NULL was passed for
625 bool readRenderTargetPixels(GrRenderTarget* target,
626 int left, int top, int width, int height,
627 GrPixelConfig config, void* buffer,
629 uint32_t pixelOpsFlags = 0);
632 * Copy the src pixels [buffer, row bytes, pixel config] into a render target at the specified
634 * @param target the render target to write into. NULL means the current render target.
635 * @param left left edge of the rectangle to write (inclusive)
636 * @param top top edge of the rectangle to write (inclusive)
637 * @param width width of rectangle to write in pixels.
638 * @param height height of rectangle to write in pixels.
639 * @param config the pixel config of the source buffer
640 * @param buffer memory to read the rectangle from.
641 * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
643 * @param pixelOpsFlags see PixelOpsFlags enum above.
645 * @return true if the write succeeded, false if not. The write can fail because of an
646 * unsupported combination of target and pixel configs.
648 bool writeRenderTargetPixels(GrRenderTarget* target,
649 int left, int top, int width, int height,
650 GrPixelConfig config, const void* buffer,
652 uint32_t pixelOpsFlags = 0);
655 * Reads a rectangle of pixels from a texture.
656 * @param texture the texture to read from.
657 * @param left left edge of the rectangle to read (inclusive)
658 * @param top top edge of the rectangle to read (inclusive)
659 * @param width width of rectangle to read in pixels.
660 * @param height height of rectangle to read in pixels.
661 * @param config the pixel config of the destination buffer
662 * @param buffer memory to read the rectangle into.
663 * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
665 * @param pixelOpsFlags see PixelOpsFlags enum above.
667 * @return true if the read succeeded, false if not. The read can fail because of an unsupported
670 bool readTexturePixels(GrTexture* texture,
671 int left, int top, int width, int height,
672 GrPixelConfig config, void* buffer,
674 uint32_t pixelOpsFlags = 0);
677 * Writes a rectangle of pixels to a texture.
678 * @param texture the render target to read from.
679 * @param left left edge of the rectangle to write (inclusive)
680 * @param top top edge of the rectangle to write (inclusive)
681 * @param width width of rectangle to write in pixels.
682 * @param height height of rectangle to write in pixels.
683 * @param config the pixel config of the source buffer
684 * @param buffer memory to read pixels from
685 * @param rowBytes number of bytes between consecutive rows. Zero
686 * means rows are tightly packed.
687 * @param pixelOpsFlags see PixelOpsFlags enum above.
688 * @return true if the write succeeded, false if not. The write can fail because of an
689 * unsupported combination of texture and pixel configs.
691 bool writeTexturePixels(GrTexture* texture,
692 int left, int top, int width, int height,
693 GrPixelConfig config, const void* buffer,
695 uint32_t pixelOpsFlags = 0);
698 * Copies a rectangle of texels from src to dst. The size of dst is the size of the rectangle
699 * copied and topLeft is the position of the rect in src. The rectangle is clipped to src's
701 * @param src the texture to copy from.
702 * @param dst the render target to copy to.
703 * @param topLeft the point in src that will be copied to the top-left of dst. If NULL,
704 * (0, 0) will be used.
706 void copyTexture(GrTexture* src, GrRenderTarget* dst, const SkIPoint* topLeft = NULL);
709 * Resolves a render target that has MSAA. The intermediate MSAA buffer is
710 * down-sampled to the associated GrTexture (accessible via
711 * GrRenderTarget::asTexture()). Any pending draws to the render target will
712 * be executed before the resolve.
714 * This is only necessary when a client wants to access the object directly
715 * using the backend API directly. GrContext will detect when it must
716 * perform a resolve to a GrTexture used as the source of a draw or before
717 * reading pixels back from a GrTexture or GrRenderTarget.
719 void resolveRenderTarget(GrRenderTarget*);
722 * Provides a perfomance hint that the render target's contents are allowed
723 * to become undefined.
725 void discardRenderTarget(GrRenderTarget*);
728 void dumpFontCache() const;
731 ///////////////////////////////////////////////////////////////////////////
734 class AutoRenderTarget : public ::SkNoncopyable {
736 AutoRenderTarget(GrContext* context, GrRenderTarget* target) {
737 fPrevTarget = context->getRenderTarget();
738 SkSafeRef(fPrevTarget);
739 context->setRenderTarget(target);
742 AutoRenderTarget(GrContext* context) {
743 fPrevTarget = context->getRenderTarget();
744 SkSafeRef(fPrevTarget);
747 ~AutoRenderTarget() {
749 fContext->setRenderTarget(fPrevTarget);
751 SkSafeUnref(fPrevTarget);
755 GrRenderTarget* fPrevTarget;
759 * Save/restore the view-matrix in the context. It can optionally adjust a paint to account
760 * for a coordinate system change. Here is an example of how the paint param can be used:
762 * A GrPaint is setup with GrProcessors. The stages will have access to the pre-matrix source
763 * geometry positions when the draw is executed. Later on a decision is made to transform the
764 * geometry to device space on the CPU. The effects now need to know that the space in which
765 * the geometry will be specified has changed.
767 * Note that when restore is called (or in the destructor) the context's matrix will be
768 * restored. However, the paint will not be restored. The caller must make a copy of the
769 * paint if necessary. Hint: use SkTCopyOnFirstWrite if the AutoMatrix is conditionally
772 class AutoMatrix : public ::SkNoncopyable {
774 AutoMatrix() : fContext(NULL) {}
776 ~AutoMatrix() { this->restore(); }
779 * Initializes by pre-concat'ing the context's current matrix with the preConcat param.
781 void setPreConcat(GrContext* context, const SkMatrix& preConcat, GrPaint* paint = NULL) {
787 fMatrix = context->getMatrix();
788 this->preConcat(preConcat, paint);
792 * Sets the context's matrix to identity. Returns false if the inverse matrix is required to
793 * update a paint but the matrix cannot be inverted.
795 bool setIdentity(GrContext* context, GrPaint* paint = NULL) {
801 if (!paint->localCoordChangeInverse(context->getMatrix())) {
805 fMatrix = context->getMatrix();
807 context->setIdentityMatrix();
812 * Replaces the context's matrix with a new matrix. Returns false if the inverse matrix is
813 * required to update a paint but the matrix cannot be inverted.
815 bool set(GrContext* context, const SkMatrix& newMatrix, GrPaint* paint = NULL) {
817 if (!this->setIdentity(context, paint)) {
820 this->preConcat(newMatrix, paint);
824 fMatrix = context->getMatrix();
825 context->setMatrix(newMatrix);
831 * If this has been initialized then the context's matrix will be further updated by
832 * pre-concat'ing the preConcat param. The matrix that will be restored remains unchanged.
833 * The paint is assumed to be relative to the context's matrix at the time this call is
834 * made, not the matrix at the time AutoMatrix was first initialized. In other words, this
835 * performs an incremental update of the paint.
837 void preConcat(const SkMatrix& preConcat, GrPaint* paint = NULL) {
839 paint->localCoordChange(preConcat);
841 fContext->concatMatrix(preConcat);
845 * Returns false if never initialized or the inverse matrix was required to update a paint
846 * but the matrix could not be inverted.
848 bool succeeded() const { return SkToBool(fContext); }
851 * If this has been initialized then the context's original matrix is restored.
855 fContext->setMatrix(fMatrix);
865 class AutoClip : public ::SkNoncopyable {
867 // This enum exists to require a caller of the constructor to acknowledge that the clip will
868 // initially be wide open. It also could be extended if there are other desirable initial
871 kWideOpen_InitialClip,
874 AutoClip(GrContext* context, InitialClip initialState)
875 : fContext(context) {
876 SkASSERT(kWideOpen_InitialClip == initialState);
877 fNewClipData.fClipStack = &fNewClipStack;
879 fOldClip = context->getClip();
880 context->setClip(&fNewClipData);
883 AutoClip(GrContext* context, const SkRect& newClipRect)
885 , fNewClipStack(newClipRect) {
886 fNewClipData.fClipStack = &fNewClipStack;
888 fOldClip = fContext->getClip();
889 fContext->setClip(&fNewClipData);
894 fContext->setClip(fOldClip);
899 const GrClipData* fOldClip;
901 SkClipStack fNewClipStack;
902 GrClipData fNewClipData;
905 class AutoWideOpenIdentityDraw {
907 AutoWideOpenIdentityDraw(GrContext* ctx, GrRenderTarget* rt)
908 : fAutoClip(ctx, AutoClip::kWideOpen_InitialClip)
910 fAutoMatrix.setIdentity(ctx);
911 // should never fail with no paint param.
912 SkASSERT(fAutoMatrix.succeeded());
917 AutoRenderTarget fAutoRT;
918 AutoMatrix fAutoMatrix;
921 ///////////////////////////////////////////////////////////////////////////
922 // Functions intended for internal use only.
923 GrGpu* getGpu() { return fGpu; }
924 const GrGpu* getGpu() const { return fGpu; }
925 GrFontCache* getFontCache() { return fFontCache; }
926 GrLayerCache* getLayerCache() { return fLayerCache.get(); }
927 GrDrawTarget* getTextTarget();
928 const GrIndexBuffer* getQuadIndexBuffer() const;
929 GrAARectRenderer* getAARectRenderer() { return fAARectRenderer; }
930 GrResourceCache2* getResourceCache2() { return fResourceCache2; }
932 // Called by tests that draw directly to the context via GrDrawTarget
933 void getTestTarget(GrTestTarget*);
935 void addGpuTraceMarker(const GrGpuTraceMarker* marker);
936 void removeGpuTraceMarker(const GrGpuTraceMarker* marker);
939 * Stencil buffers add themselves to the cache using addStencilBuffer. findStencilBuffer is
940 * called to check the cache for a SB that matches an RT's criteria.
942 void addStencilBuffer(GrStencilBuffer* sb);
943 GrStencilBuffer* findStencilBuffer(int width, int height, int sampleCnt);
945 GrPathRenderer* getPathRenderer(
947 const SkStrokeRec& stroke,
948 const GrDrawTarget* target,
950 GrPathRendererChain::DrawType drawType = GrPathRendererChain::kColor_DrawType,
951 GrPathRendererChain::StencilSupport* stencilSupport = NULL);
954 * This returns a copy of the the GrContext::Options that was passed to the
955 * constructor of this class.
957 const Options& getOptions() const { return fOptions; }
960 void printCacheStats() const;
966 GPUStats() { this->reset(); }
968 void reset() { fRenderTargetBinds = 0; fShaderCompilations = 0; }
970 int renderTargetBinds() const { return fRenderTargetBinds; }
971 void incRenderTargetBinds() { fRenderTargetBinds++; }
972 int shaderCompilations() const { return fShaderCompilations; }
973 void incShaderCompilations() { fShaderCompilations++; }
975 int fRenderTargetBinds;
976 int fShaderCompilations;
978 void incRenderTargetBinds() {}
979 void incShaderCompilations() {}
984 const GPUStats* gpuStats() const;
988 // Used to indicate whether a draw should be performed immediately or queued in fDrawBuffer.
993 BufferedDraw fLastDrawWasBuffered;
996 SkMatrix fViewMatrix;
997 SkAutoTUnref<GrRenderTarget> fRenderTarget;
998 const GrClipData* fClip; // TODO: make this ref counted
999 GrDrawState* fDrawState;
1001 GrResourceCache* fResourceCache;
1002 GrResourceCache2* fResourceCache2;
1003 GrFontCache* fFontCache;
1004 SkAutoTDelete<GrLayerCache> fLayerCache;
1006 GrPathRendererChain* fPathRendererChain;
1007 GrSoftwarePathRenderer* fSoftwarePathRenderer;
1009 GrVertexBufferAllocPool* fDrawBufferVBAllocPool;
1010 GrIndexBufferAllocPool* fDrawBufferIBAllocPool;
1011 GrInOrderDrawBuffer* fDrawBuffer;
1013 // Set by OverbudgetCB() to request that GrContext flush before exiting a draw.
1014 bool fFlushToReduceCacheSize;
1016 GrAARectRenderer* fAARectRenderer;
1017 GrOvalRenderer* fOvalRenderer;
1019 bool fDidTestPMConversions;
1020 int fPMToUPMConversion;
1021 int fUPMToPMConversion;
1023 struct CleanUpData {
1024 PFCleanUpFunc fFunc;
1028 SkTDArray<CleanUpData> fCleanUpData;
1030 int fMaxTextureSizeOverride;
1032 const Options fOptions;
1034 GrContext(const Options&); // init must be called after the constructor.
1035 bool init(GrBackend, GrBackendContext);
1037 void setupDrawBuffer();
1039 class AutoRestoreEffects;
1040 class AutoCheckFlush;
1041 /// Sets the paint and returns the target to draw into. The paint can be NULL in which case the
1042 /// draw state is left unmodified.
1043 GrDrawTarget* prepareToDraw(const GrPaint*, BufferedDraw, AutoRestoreEffects*, AutoCheckFlush*);
1045 void internalDrawPath(GrDrawTarget* target, bool useAA, const SkPath& path,
1046 const GrStrokeInfo& stroke);
1048 GrTexture* createResizedTexture(const GrTextureDesc& desc,
1049 const GrCacheID& cacheID,
1050 const void* srcData,
1054 // Needed so GrTexture's returnToCache helper function can call
1055 // addExistingTextureToCache
1056 friend class GrTexture;
1057 friend class GrStencilAndCoverPathRenderer;
1058 friend class GrStencilAndCoverTextContext;
1060 // Add an existing texture to the texture cache. This is intended solely
1061 // for use with textures released from an GrAutoScratchTexture.
1062 void addExistingTextureToCache(GrTexture* texture);
1065 * These functions create premul <-> unpremul effects if it is possible to generate a pair
1066 * of effects that make a readToUPM->writeToPM->readToUPM cycle invariant. Otherwise, they
1069 const GrFragmentProcessor* createPMToUPMEffect(GrTexture*, bool swapRAndB, const SkMatrix&);
1070 const GrFragmentProcessor* createUPMToPMEffect(GrTexture*, bool swapRAndB, const SkMatrix&);
1073 * This callback allows the resource cache to callback into the GrContext
1074 * when the cache is still overbudget after a purge.
1076 static bool OverbudgetCB(void* data);
1078 typedef SkRefCnt INHERITED;
1082 * Gets and locks a scratch texture from a descriptor using either exact or approximate criteria.
1083 * Unlocks texture in the destructor.
1085 class GrAutoScratchTexture : public ::SkNoncopyable {
1087 GrAutoScratchTexture()
1092 GrAutoScratchTexture(GrContext* context,
1093 const GrTextureDesc& desc,
1094 GrContext::ScratchTexMatch match = GrContext::kApprox_ScratchTexMatch)
1097 this->set(context, desc, match);
1100 ~GrAutoScratchTexture() {
1105 if (fContext && fTexture) {
1106 fContext->unlockScratchTexture(fTexture);
1113 * When detaching a texture we do not unlock it in the texture cache but
1114 * we do set the returnToCache flag. In this way the texture remains
1115 * "locked" in the texture cache until it is freed and recycled in
1116 * GrTexture::internal_dispose. In reality, the texture has been removed
1117 * from the cache (because this is in AutoScratchTexture) and by not
1118 * calling unlockScratchTexture we simply don't re-add it. It will be
1119 * reattached in GrTexture::internal_dispose.
1121 * Note that the caller is assumed to accept and manage the ref to the
1124 GrTexture* detach() {
1125 if (NULL == fTexture) {
1128 GrTexture* texture = fTexture;
1131 // This GrAutoScratchTexture has a ref from lockAndRefScratchTexture, which we give up now.
1132 // The cache also has a ref which we are lending to the caller of detach(). When the caller
1133 // lets go of the ref and the ref count goes to 0 internal_dispose will see this flag is
1134 // set and re-ref the texture, thereby restoring the cache's ref.
1135 SkASSERT(!texture->unique());
1136 texture->impl()->setFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit);
1138 SkASSERT(texture->getCacheEntry());
1143 GrTexture* set(GrContext* context,
1144 const GrTextureDesc& desc,
1145 GrContext::ScratchTexMatch match = GrContext::kApprox_ScratchTexMatch) {
1150 fTexture = fContext->lockAndRefScratchTexture(desc, match);
1151 if (NULL == fTexture) {
1160 GrTexture* texture() { return fTexture; }
1163 GrContext* fContext;
1164 GrTexture* fTexture;