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"
16 #include "GrRenderTarget.h"
17 #include "GrTexture.h"
21 class GrAARectRenderer;
22 class GrAutoScratchTexture;
30 class GrIndexBufferAllocPool;
31 class GrInOrderDrawBuffer;
36 class GrResourceEntry;
37 class GrResourceCache;
38 class GrStencilBuffer;
40 class GrTextureParams;
42 class GrVertexBufferAllocPool;
43 class GrSoftwarePathRenderer;
46 class SK_API GrContext : public SkRefCnt {
48 SK_DECLARE_INST_COUNT(GrContext)
51 * Creates a GrContext for a backend context.
53 static GrContext* Create(GrBackend, GrBackendContext);
58 * The GrContext normally assumes that no outsider is setting state
59 * within the underlying 3D API's context/device/whatever. This call informs
60 * the context that the state was modified and it should resend. Shouldn't
61 * be called frequently for good performance.
62 * The flag bits, state, is dpendent on which backend is used by the
63 * context, either GL or D3D (possible in future).
65 void resetContext(uint32_t state = kAll_GrBackendState);
68 * Callback function to allow classes to cleanup on GrContext destruction.
69 * The 'info' field is filled in with the 'info' passed to addCleanUp.
71 typedef void (*PFCleanUpFunc)(const GrContext* context, void* info);
74 * Add a function to be called from within GrContext's destructor.
75 * This gives classes a chance to free resources held on a per context basis.
76 * The 'info' parameter will be stored and passed to the callback function.
78 void addCleanUp(PFCleanUpFunc cleanUp, void* info) {
79 CleanUpData* entry = fCleanUpData.push();
81 entry->fFunc = cleanUp;
86 * Abandons all GPU resources, assumes 3D API state is unknown. Call this
87 * if you have lost the associated GPU context, and thus internal texture,
88 * buffer, etc. references/IDs are now invalid. Should be called even when
89 * GrContext is no longer going to be used for two reasons:
90 * 1) ~GrContext will not try to free the objects in the 3D API.
91 * 2) If you've created GrGpuObjects that outlive the GrContext they will
92 * be marked as invalid (GrGpuObjects::isValid()) and won't attempt to
93 * free their underlying resource in the 3D API.
94 * Content drawn since the last GrContext::flush() may be lost.
99 * Similar to contextLost, but makes no attempt to reset state.
100 * Use this method when GrContext destruction is pending, but
101 * the graphics context is destroyed first.
103 void contextDestroyed();
106 * Frees GPU created by the context. Can be called to reduce GPU memory
109 void freeGpuResources();
112 * Returns the number of bytes of GPU memory hosted by the texture cache.
114 size_t getGpuTextureCacheBytes() const;
117 * Returns the number of resources hosted by the texture cache.
119 int getGpuTextureCacheResourceCount() const;
121 ///////////////////////////////////////////////////////////////////////////
125 * Creates a new entry, based on the specified key and texture and returns it. The caller owns a
126 * ref on the returned texture which must be balanced by a call to unref.
128 * @param params The texture params used to draw a texture may help determine
129 * the cache entry used. (e.g. different versions may exist
130 * for different wrap modes on GPUs with limited NPOT
131 * texture support). NULL implies clamp wrap modes.
132 * @param desc Description of the texture properties.
133 * @param cacheID Cache-specific properties (e.g., texture gen ID)
134 * @param srcData Pointer to the pixel values.
135 * @param rowBytes The number of bytes between rows of the texture. Zero
136 * implies tightly packed rows.
137 * @param cacheKey (optional) If non-NULL, we'll write the cache key we used to cacheKey.
139 GrTexture* createTexture(const GrTextureParams* params,
140 const GrTextureDesc& desc,
141 const GrCacheID& cacheID,
144 GrResourceKey* cacheKey = NULL);
147 * Search for an entry based on key and dimensions. If found, ref it and return it. The return
148 * value will be NULL if not found. The caller must balance with a call to unref.
150 * @param desc Description of the texture properties.
151 * @param cacheID Cache-specific properties (e.g., texture gen ID)
152 * @param params The texture params used to draw a texture may help determine
153 * the cache entry used. (e.g. different versions may exist
154 * for different wrap modes on GPUs with limited NPOT
155 * texture support). NULL implies clamp wrap modes.
157 GrTexture* findAndRefTexture(const GrTextureDesc& desc,
158 const GrCacheID& cacheID,
159 const GrTextureParams* params);
161 * Determines whether a texture is in the cache. If the texture is found it
162 * will not be locked or returned. This call does not affect the priority of
163 * the texture for deletion.
165 bool isTextureInCache(const GrTextureDesc& desc,
166 const GrCacheID& cacheID,
167 const GrTextureParams* params) const;
170 * Enum that determines how closely a returned scratch texture must match
171 * a provided GrTextureDesc.
173 enum ScratchTexMatch {
175 * Finds a texture that exactly matches the descriptor.
177 kExact_ScratchTexMatch,
179 * Finds a texture that approximately matches the descriptor. Will be
180 * at least as large in width and height as desc specifies. If desc
181 * specifies that texture is a render target then result will be a
182 * render target. If desc specifies a render target and doesn't set the
183 * no stencil flag then result will have a stencil. Format and aa level
186 kApprox_ScratchTexMatch
190 * Returns a texture matching the desc. It's contents are unknown. Subsequent
191 * requests with the same descriptor are not guaranteed to return the same
192 * texture. The same texture is guaranteed not be returned again until it is
193 * unlocked. Call must be balanced with an unlockTexture() call. The caller
194 * owns a ref on the returned texture and must balance with a call to unref.
196 * Textures created by createAndLockTexture() hide the complications of
197 * tiling non-power-of-two textures on APIs that don't support this (e.g.
198 * unextended GLES2). Tiling a NPOT texture created by lockScratchTexture on
199 * such an API will create gaps in the tiling pattern. This includes clamp
200 * mode. (This may be addressed in a future update.)
202 GrTexture* lockAndRefScratchTexture(const GrTextureDesc&, ScratchTexMatch match);
205 * When done with an entry, call unlockScratchTexture(entry) on it, which returns
206 * it to the cache, where it may be purged. This does not unref the texture.
208 void unlockScratchTexture(GrTexture* texture);
211 * This method should be called whenever a GrTexture is unreffed or
212 * switched from exclusive to non-exclusive. This
213 * gives the resource cache a chance to discard unneeded textures.
214 * Note: this entry point will be removed once totally ref-driven
215 * cache maintenance is implemented
220 * Purge all the unlocked resources from the cache.
221 * This entry point is mainly meant for timing texture uploads
222 * and is not defined in normal builds of Skia.
224 void purgeAllUnlockedResources();
227 * Creates a texture that is outside the cache. Does not count against
230 GrTexture* createUncachedTexture(const GrTextureDesc& desc,
235 * Returns true if the specified use of an indexed texture is supported.
236 * Support may depend upon whether the texture params indicate that the
237 * texture will be tiled. Passing NULL for the texture params indicates
240 bool supportsIndex8PixelConfig(const GrTextureParams*,
245 * Return the current texture cache limits.
247 * @param maxTextures If non-null, returns maximum number of textures that
248 * can be held in the cache.
249 * @param maxTextureBytes If non-null, returns maximum number of bytes of
250 * texture memory that can be held in the cache.
252 void getTextureCacheLimits(int* maxTextures, size_t* maxTextureBytes) const;
255 * Specify the texture cache limits. If the current cache exceeds either
256 * of these, it will be purged (LRU) to keep the cache within these limits.
258 * @param maxTextures The maximum number of textures that can be held in
260 * @param maxTextureBytes The maximum number of bytes of texture memory
261 * that can be held in the cache.
263 void setTextureCacheLimits(int maxTextures, size_t maxTextureBytes);
266 * Return the max width or height of a texture supported by the current GPU.
268 int getMaxTextureSize() const;
271 * Temporarily override the true max texture size. Note: an override
272 * larger then the true max texture size will have no effect.
273 * This entry point is mainly meant for testing texture size dependent
274 * features and is only available if defined outside of Skia (see
277 void setMaxTextureSizeOverride(int maxTextureSizeOverride);
279 ///////////////////////////////////////////////////////////////////////////
283 * Sets the render target.
284 * @param target the render target to set.
286 void setRenderTarget(GrRenderTarget* target) {
287 fRenderTarget.reset(SkSafeRef(target));
291 * Gets the current render target.
292 * @return the currently bound render target.
294 const GrRenderTarget* getRenderTarget() const { return fRenderTarget.get(); }
295 GrRenderTarget* getRenderTarget() { return fRenderTarget.get(); }
297 GrAARectRenderer* getAARectRenderer() { return fAARectRenderer; }
300 * Can the provided configuration act as a color render target?
302 bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const;
305 * Return the max width or height of a render target supported by the
308 int getMaxRenderTargetSize() const;
311 * Returns the max sample count for a render target. It will be 0 if MSAA
314 int getMaxSampleCount() const;
317 * Returns the recommended sample count for a render target when using this
320 * @param config the configuration of the render target.
321 * @param dpi the display density in dots per inch.
323 * @return sample count that should be perform well and have good enough
324 * rendering quality for the display. Alternatively returns 0 if
325 * MSAA is not supported or recommended to be used by default.
327 int getRecommendedSampleCount(GrPixelConfig config, SkScalar dpi) const;
329 ///////////////////////////////////////////////////////////////////////////
333 * Wraps an existing texture with a GrTexture object.
335 * OpenGL: if the object is a texture Gr may change its GL texture params
338 * @param desc description of the object to create.
340 * @return GrTexture object or NULL on failure.
342 GrTexture* wrapBackendTexture(const GrBackendTextureDesc& desc);
345 * Wraps an existing render target with a GrRenderTarget object. It is
346 * similar to wrapBackendTexture but can be used to draw into surfaces
347 * that are not also textures (e.g. FBO 0 in OpenGL, or an MSAA buffer that
348 * the client will resolve to a texture).
350 * @param desc description of the object to create.
352 * @return GrTexture object or NULL on failure.
354 GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc);
356 ///////////////////////////////////////////////////////////////////////////
360 * Gets the current transformation matrix.
361 * @return the current matrix.
363 const SkMatrix& getMatrix() const { return fViewMatrix; }
366 * Sets the transformation matrix.
367 * @param m the matrix to set.
369 void setMatrix(const SkMatrix& m) { fViewMatrix = m; }
372 * Sets the current transformation matrix to identity.
374 void setIdentityMatrix() { fViewMatrix.reset(); }
377 * Concats the current matrix. The passed matrix is applied before the
379 * @param m the matrix to concat.
381 void concatMatrix(const SkMatrix& m) { fViewMatrix.preConcat(m); }
384 ///////////////////////////////////////////////////////////////////////////
387 * Gets the current clip.
388 * @return the current clip.
390 const GrClipData* getClip() const { return fClip; }
394 * @param clipData the clip to set.
396 void setClip(const GrClipData* clipData) { fClip = clipData; }
398 ///////////////////////////////////////////////////////////////////////////
402 * Clear the entire or rect of the render target, ignoring any clips.
403 * @param rect the rect to clear or the whole thing if rect is NULL.
404 * @param color the color to clear to.
405 * @param canIgnoreRect allows partial clears to be converted to whole
406 * clears on platforms for which that is cheap
407 * @param target if non-NULL, the render target to clear otherwise clear
408 * the current render target
410 void clear(const SkIRect* rect, GrColor color, bool canIgnoreRect,
411 GrRenderTarget* target = NULL);
414 * Draw everywhere (respecting the clip) with the paint.
416 void drawPaint(const GrPaint& paint);
419 * Draw the rect using a paint.
420 * @param paint describes how to color pixels.
421 * @param stroke the stroke information (width, join, cap).
422 * If stroke == NULL, then the rect is filled.
423 * Otherwise, if stroke width == 0, then the stroke
424 * is always a single pixel thick, else the rect is
425 * mitered/beveled stroked based on stroke width.
426 * @param matrix Optional matrix applied to the rect. Applied before
427 * context's matrix or the paint's matrix.
428 * The rects coords are used to access the paint (through texture matrix)
430 void drawRect(const GrPaint& paint,
432 const SkStrokeRec* stroke = NULL,
433 const SkMatrix* matrix = NULL);
436 * Maps a rect of local coordinates onto the a rect of destination
437 * coordinates. Each rect can optionally be transformed. The localRect
438 * is stretched over the dstRect. The dstRect is transformed by the
439 * context's matrix. Additional optional matrices for both rects can be
440 * provided by parameters.
442 * @param paint describes how to color pixels.
443 * @param dstRect the destination rect to draw.
444 * @param localRect rect of local coordinates to be mapped onto dstRect
445 * @param dstMatrix Optional matrix to transform dstRect. Applied before context's matrix.
446 * @param localMatrix Optional matrix to transform localRect.
448 void drawRectToRect(const GrPaint& paint,
449 const SkRect& dstRect,
450 const SkRect& localRect,
451 const SkMatrix* dstMatrix = NULL,
452 const SkMatrix* localMatrix = NULL);
455 * Draw a roundrect using a paint.
457 * @param paint describes how to color pixels.
458 * @param rrect the roundrect to draw
459 * @param stroke the stroke information (width, join, cap)
461 void drawRRect(const GrPaint& paint, const SkRRect& rrect, const SkStrokeRec& stroke);
464 * Shortcut for drawing an SkPath consisting of nested rrects using a paint.
465 * Does not support stroking. The result is undefined if outer does not contain
468 * @param paint describes how to color pixels.
469 * @param outer the outer roundrect
470 * @param inner the inner roundrect
472 void drawDRRect(const GrPaint& paint, const SkRRect& outer, const SkRRect& inner);
478 * @param paint describes how to color pixels.
479 * @param path the path to draw
480 * @param stroke the stroke information (width, join, cap)
482 void drawPath(const GrPaint& paint, const SkPath& path, const SkStrokeRec& stroke);
485 * Draws vertices with a paint.
487 * @param paint describes how to color pixels.
488 * @param primitiveType primitives type to draw.
489 * @param vertexCount number of vertices.
490 * @param positions array of vertex positions, required.
491 * @param texCoords optional array of texture coordinates used
492 * to access the paint.
493 * @param colors optional array of per-vertex colors, supercedes
494 * the paint's color field.
495 * @param indices optional array of indices. If NULL vertices
496 * are drawn non-indexed.
497 * @param indexCount if indices is non-null then this is the
500 void drawVertices(const GrPaint& paint,
501 GrPrimitiveType primitiveType,
503 const SkPoint positions[],
504 const SkPoint texs[],
505 const GrColor colors[],
506 const uint16_t indices[],
512 * @param paint describes how to color pixels.
513 * @param oval the bounding rect of the oval.
514 * @param stroke the stroke information (width, style)
516 void drawOval(const GrPaint& paint,
518 const SkStrokeRec& stroke);
520 ///////////////////////////////////////////////////////////////////////////
524 * Flags that affect flush() behavior.
528 * A client may reach a point where it has partially rendered a frame
529 * through a GrContext that it knows the user will never see. This flag
530 * causes the flush to skip submission of deferred content to the 3D API
533 kDiscard_FlushBit = 0x2,
537 * Call to ensure all drawing to the context has been issued to the
539 * @param flagsBitfield flags that control the flushing behavior. See
542 void flush(int flagsBitfield = 0);
545 * These flags can be used with the read/write pixels functions below.
548 /** The GrContext will not be flushed. This means that the read or write may occur before
549 previous draws have executed. */
550 kDontFlush_PixelOpsFlag = 0x1,
551 /** The src for write or dst read is unpremultiplied. This is only respected if both the
552 config src and dst configs are an RGBA/BGRA 8888 format. */
553 kUnpremul_PixelOpsFlag = 0x2,
557 * Reads a rectangle of pixels from a render target.
558 * @param target the render target to read from. NULL means the current render target.
559 * @param left left edge of the rectangle to read (inclusive)
560 * @param top top edge of the rectangle to read (inclusive)
561 * @param width width of rectangle to read in pixels.
562 * @param height height of rectangle to read in pixels.
563 * @param config the pixel config of the destination buffer
564 * @param buffer memory to read the rectangle into.
565 * @param rowBytes number of bytes bewtween consecutive rows. Zero means rows are tightly
567 * @param pixelOpsFlags see PixelOpsFlags enum above.
569 * @return true if the read succeeded, false if not. The read can fail because of an unsupported
570 * pixel config or because no render target is currently set and NULL was passed for
573 bool readRenderTargetPixels(GrRenderTarget* target,
574 int left, int top, int width, int height,
575 GrPixelConfig config, void* buffer,
577 uint32_t pixelOpsFlags = 0);
580 * Copy the src pixels [buffer, row bytes, pixel config] into a render target at the specified
582 * @param target the render target to write into. NULL means the current render target.
583 * @param left left edge of the rectangle to write (inclusive)
584 * @param top top edge of the rectangle to write (inclusive)
585 * @param width width of rectangle to write in pixels.
586 * @param height height of rectangle to write in pixels.
587 * @param config the pixel config of the source buffer
588 * @param buffer memory to read the rectangle from.
589 * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
591 * @param pixelOpsFlags see PixelOpsFlags enum above.
593 * @return true if the write succeeded, false if not. The write can fail because of an
594 * unsupported combination of target and pixel configs.
596 bool writeRenderTargetPixels(GrRenderTarget* target,
597 int left, int top, int width, int height,
598 GrPixelConfig config, const void* buffer,
600 uint32_t pixelOpsFlags = 0);
603 * Reads a rectangle of pixels from a texture.
604 * @param texture the texture to read from.
605 * @param left left edge of the rectangle to read (inclusive)
606 * @param top top edge of the rectangle to read (inclusive)
607 * @param width width of rectangle to read in pixels.
608 * @param height height of rectangle to read in pixels.
609 * @param config the pixel config of the destination buffer
610 * @param buffer memory to read the rectangle into.
611 * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
613 * @param pixelOpsFlags see PixelOpsFlags enum above.
615 * @return true if the read succeeded, false if not. The read can fail because of an unsupported
618 bool readTexturePixels(GrTexture* texture,
619 int left, int top, int width, int height,
620 GrPixelConfig config, void* buffer,
622 uint32_t pixelOpsFlags = 0);
625 * Writes a rectangle of pixels to a texture.
626 * @param texture the render target to read from.
627 * @param left left edge of the rectangle to write (inclusive)
628 * @param top top edge of the rectangle to write (inclusive)
629 * @param width width of rectangle to write in pixels.
630 * @param height height of rectangle to write in pixels.
631 * @param config the pixel config of the source buffer
632 * @param buffer memory to read pixels from
633 * @param rowBytes number of bytes between consecutive rows. Zero
634 * means rows are tightly packed.
635 * @param pixelOpsFlags see PixelOpsFlags enum above.
636 * @return true if the write succeeded, false if not. The write can fail because of an
637 * unsupported combination of texture and pixel configs.
639 bool writeTexturePixels(GrTexture* texture,
640 int left, int top, int width, int height,
641 GrPixelConfig config, const void* buffer,
643 uint32_t pixelOpsFlags = 0);
647 * Copies a rectangle of texels from src to dst. The size of dst is the size of the rectangle
648 * copied and topLeft is the position of the rect in src. The rectangle is clipped to src's
650 * @param src the texture to copy from.
651 * @param dst the render target to copy to.
652 * @param topLeft the point in src that will be copied to the top-left of dst. If NULL,
653 * (0, 0) will be used.
655 void copyTexture(GrTexture* src, GrRenderTarget* dst, const SkIPoint* topLeft = NULL);
658 * Resolves a render target that has MSAA. The intermediate MSAA buffer is
659 * down-sampled to the associated GrTexture (accessible via
660 * GrRenderTarget::asTexture()). Any pending draws to the render target will
661 * be executed before the resolve.
663 * This is only necessary when a client wants to access the object directly
664 * using the backend API directly. GrContext will detect when it must
665 * perform a resolve to a GrTexture used as the source of a draw or before
666 * reading pixels back from a GrTexture or GrRenderTarget.
668 void resolveRenderTarget(GrRenderTarget*);
671 * Provides a perfomance hint that the render target's contents are allowed
672 * to become undefined.
674 void discardRenderTarget(GrRenderTarget*);
677 void dumpFontCache() const;
680 ///////////////////////////////////////////////////////////////////////////
683 class AutoRenderTarget : public ::SkNoncopyable {
685 AutoRenderTarget(GrContext* context, GrRenderTarget* target) {
686 fPrevTarget = context->getRenderTarget();
687 SkSafeRef(fPrevTarget);
688 context->setRenderTarget(target);
691 AutoRenderTarget(GrContext* context) {
692 fPrevTarget = context->getRenderTarget();
693 SkSafeRef(fPrevTarget);
696 ~AutoRenderTarget() {
697 if (NULL != fContext) {
698 fContext->setRenderTarget(fPrevTarget);
700 SkSafeUnref(fPrevTarget);
704 GrRenderTarget* fPrevTarget;
708 * Save/restore the view-matrix in the context. It can optionally adjust a paint to account
709 * for a coordinate system change. Here is an example of how the paint param can be used:
711 * A GrPaint is setup with GrEffects. The stages will have access to the pre-matrix source
712 * geometry positions when the draw is executed. Later on a decision is made to transform the
713 * geometry to device space on the CPU. The effects now need to know that the space in which
714 * the geometry will be specified has changed.
716 * Note that when restore is called (or in the destructor) the context's matrix will be
717 * restored. However, the paint will not be restored. The caller must make a copy of the
718 * paint if necessary. Hint: use SkTCopyOnFirstWrite if the AutoMatrix is conditionally
721 class AutoMatrix : public ::SkNoncopyable {
723 AutoMatrix() : fContext(NULL) {}
725 ~AutoMatrix() { this->restore(); }
728 * Initializes by pre-concat'ing the context's current matrix with the preConcat param.
730 void setPreConcat(GrContext* context, const SkMatrix& preConcat, GrPaint* paint = NULL) {
731 SkASSERT(NULL != context);
736 fMatrix = context->getMatrix();
737 this->preConcat(preConcat, paint);
741 * Sets the context's matrix to identity. Returns false if the inverse matrix is required to
742 * update a paint but the matrix cannot be inverted.
744 bool setIdentity(GrContext* context, GrPaint* paint = NULL) {
745 SkASSERT(NULL != context);
750 if (!paint->localCoordChangeInverse(context->getMatrix())) {
754 fMatrix = context->getMatrix();
756 context->setIdentityMatrix();
761 * Replaces the context's matrix with a new matrix. Returns false if the inverse matrix is
762 * required to update a paint but the matrix cannot be inverted.
764 bool set(GrContext* context, const SkMatrix& newMatrix, GrPaint* paint = NULL) {
766 if (!this->setIdentity(context, paint)) {
769 this->preConcat(newMatrix, paint);
773 fMatrix = context->getMatrix();
774 context->setMatrix(newMatrix);
780 * If this has been initialized then the context's matrix will be further updated by
781 * pre-concat'ing the preConcat param. The matrix that will be restored remains unchanged.
782 * The paint is assumed to be relative to the context's matrix at the time this call is
783 * made, not the matrix at the time AutoMatrix was first initialized. In other words, this
784 * performs an incremental update of the paint.
786 void preConcat(const SkMatrix& preConcat, GrPaint* paint = NULL) {
788 paint->localCoordChange(preConcat);
790 fContext->concatMatrix(preConcat);
794 * Returns false if never initialized or the inverse matrix was required to update a paint
795 * but the matrix could not be inverted.
797 bool succeeded() const { return NULL != fContext; }
800 * If this has been initialized then the context's original matrix is restored.
803 if (NULL != fContext) {
804 fContext->setMatrix(fMatrix);
814 class AutoClip : public ::SkNoncopyable {
816 // This enum exists to require a caller of the constructor to acknowledge that the clip will
817 // initially be wide open. It also could be extended if there are other desirable initial
820 kWideOpen_InitialClip,
823 AutoClip(GrContext* context, InitialClip initialState)
824 : fContext(context) {
825 SkASSERT(kWideOpen_InitialClip == initialState);
826 fNewClipData.fClipStack = &fNewClipStack;
828 fOldClip = context->getClip();
829 context->setClip(&fNewClipData);
832 AutoClip(GrContext* context, const SkRect& newClipRect)
834 , fNewClipStack(newClipRect) {
835 fNewClipData.fClipStack = &fNewClipStack;
837 fOldClip = fContext->getClip();
838 fContext->setClip(&fNewClipData);
842 if (NULL != fContext) {
843 fContext->setClip(fOldClip);
848 const GrClipData* fOldClip;
850 SkClipStack fNewClipStack;
851 GrClipData fNewClipData;
854 class AutoWideOpenIdentityDraw {
856 AutoWideOpenIdentityDraw(GrContext* ctx, GrRenderTarget* rt)
857 : fAutoClip(ctx, AutoClip::kWideOpen_InitialClip)
859 fAutoMatrix.setIdentity(ctx);
860 // should never fail with no paint param.
861 SkASSERT(fAutoMatrix.succeeded());
866 AutoRenderTarget fAutoRT;
867 AutoMatrix fAutoMatrix;
870 ///////////////////////////////////////////////////////////////////////////
871 // Functions intended for internal use only.
872 GrGpu* getGpu() { return fGpu; }
873 const GrGpu* getGpu() const { return fGpu; }
874 GrFontCache* getFontCache() { return fFontCache; }
875 GrLayerCache* getLayerCache() { return fLayerCache.get(); }
876 GrDrawTarget* getTextTarget();
877 const GrIndexBuffer* getQuadIndexBuffer() const;
879 // Called by tests that draw directly to the context via GrDrawTarget
880 void getTestTarget(GrTestTarget*);
882 // Functions for managing gpu trace markers
883 bool isGpuTracingEnabled() const { return fGpuTracingEnabled; }
884 void enableGpuTracing() { fGpuTracingEnabled = true; }
885 void disableGpuTracing() { fGpuTracingEnabled = false; }
888 * Stencil buffers add themselves to the cache using addStencilBuffer. findStencilBuffer is
889 * called to check the cache for a SB that matches an RT's criteria.
891 void addStencilBuffer(GrStencilBuffer* sb);
892 GrStencilBuffer* findStencilBuffer(int width, int height, int sampleCnt);
894 GrPathRenderer* getPathRenderer(
896 const SkStrokeRec& stroke,
897 const GrDrawTarget* target,
899 GrPathRendererChain::DrawType drawType = GrPathRendererChain::kColor_DrawType,
900 GrPathRendererChain::StencilSupport* stencilSupport = NULL);
903 * Stores a custom resource in the cache, based on the specified key.
905 void addResourceToCache(const GrResourceKey&, GrCacheable*);
908 * Finds a resource in the cache, based on the specified key. This is intended for use in
909 * conjunction with addResourceToCache(). The return value will be NULL if not found. The
910 * caller must balance with a call to unref().
912 GrCacheable* findAndRefCachedResource(const GrResourceKey&);
915 void printCacheStats() const;
919 // Used to indicate whether a draw should be performed immediately or queued in fDrawBuffer.
924 BufferedDraw fLastDrawWasBuffered;
927 SkMatrix fViewMatrix;
928 SkAutoTUnref<GrRenderTarget> fRenderTarget;
929 const GrClipData* fClip; // TODO: make this ref counted
930 GrDrawState* fDrawState;
932 GrResourceCache* fTextureCache;
933 GrFontCache* fFontCache;
934 SkAutoTDelete<GrLayerCache> fLayerCache;
936 GrPathRendererChain* fPathRendererChain;
937 GrSoftwarePathRenderer* fSoftwarePathRenderer;
939 GrVertexBufferAllocPool* fDrawBufferVBAllocPool;
940 GrIndexBufferAllocPool* fDrawBufferIBAllocPool;
941 GrInOrderDrawBuffer* fDrawBuffer;
943 // Set by OverbudgetCB() to request that GrContext flush before exiting a draw.
944 bool fFlushToReduceCacheSize;
946 GrAARectRenderer* fAARectRenderer;
947 GrOvalRenderer* fOvalRenderer;
949 bool fDidTestPMConversions;
950 int fPMToUPMConversion;
951 int fUPMToPMConversion;
958 SkTDArray<CleanUpData> fCleanUpData;
960 int fMaxTextureSizeOverride;
962 bool fGpuTracingEnabled;
964 GrContext(); // init must be called after the constructor.
965 bool init(GrBackend, GrBackendContext);
967 void setupDrawBuffer();
969 class AutoRestoreEffects;
970 class AutoCheckFlush;
971 /// Sets the paint and returns the target to draw into. The paint can be NULL in which case the
972 /// draw state is left unmodified.
973 GrDrawTarget* prepareToDraw(const GrPaint*, BufferedDraw, AutoRestoreEffects*, AutoCheckFlush*);
975 void internalDrawPath(GrDrawTarget* target, bool useAA, const SkPath& path,
976 const SkStrokeRec& stroke);
978 GrTexture* createResizedTexture(const GrTextureDesc& desc,
979 const GrCacheID& cacheID,
984 // Needed so GrTexture's returnToCache helper function can call
985 // addExistingTextureToCache
986 friend class GrTexture;
987 friend class GrStencilAndCoverPathRenderer;
989 // Add an existing texture to the texture cache. This is intended solely
990 // for use with textures released from an GrAutoScratchTexture.
991 void addExistingTextureToCache(GrTexture* texture);
994 * These functions create premul <-> unpremul effects if it is possible to generate a pair
995 * of effects that make a readToUPM->writeToPM->readToUPM cycle invariant. Otherwise, they
998 const GrEffectRef* createPMToUPMEffect(GrTexture* texture,
1000 const SkMatrix& matrix);
1001 const GrEffectRef* createUPMToPMEffect(GrTexture* texture,
1003 const SkMatrix& matrix);
1006 * This callback allows the resource cache to callback into the GrContext
1007 * when the cache is still overbudget after a purge.
1009 static bool OverbudgetCB(void* data);
1011 /** Creates a new gpu path, based on the specified path and stroke and returns it.
1012 * The caller owns a ref on the returned path which must be balanced by a call to unref.
1014 * @param skPath the path geometry.
1015 * @param stroke the path stroke.
1016 * @return a new path or NULL if the operation is not supported by the backend.
1018 GrPath* createPath(const SkPath& skPath, const SkStrokeRec& stroke);
1020 typedef SkRefCnt INHERITED;
1024 * Gets and locks a scratch texture from a descriptor using either exact or approximate criteria.
1025 * Unlocks texture in the destructor.
1027 class GrAutoScratchTexture : public ::SkNoncopyable {
1029 GrAutoScratchTexture()
1034 GrAutoScratchTexture(GrContext* context,
1035 const GrTextureDesc& desc,
1036 GrContext::ScratchTexMatch match = GrContext::kApprox_ScratchTexMatch)
1039 this->set(context, desc, match);
1042 ~GrAutoScratchTexture() {
1047 if (NULL != fContext && NULL != fTexture) {
1048 fContext->unlockScratchTexture(fTexture);
1055 * When detaching a texture we do not unlock it in the texture cache but
1056 * we do set the returnToCache flag. In this way the texture remains
1057 * "locked" in the texture cache until it is freed and recycled in
1058 * GrTexture::internal_dispose. In reality, the texture has been removed
1059 * from the cache (because this is in AutoScratchTexture) and by not
1060 * calling unlockScratchTexture we simply don't re-add it. It will be
1061 * reattached in GrTexture::internal_dispose.
1063 * Note that the caller is assumed to accept and manage the ref to the
1066 GrTexture* detach() {
1067 if (NULL == fTexture) {
1070 GrTexture* texture = fTexture;
1073 // This GrAutoScratchTexture has a ref from lockAndRefScratchTexture, which we give up now.
1074 // The cache also has a ref which we are lending to the caller of detach(). When the caller
1075 // lets go of the ref and the ref count goes to 0 internal_dispose will see this flag is
1076 // set and re-ref the texture, thereby restoring the cache's ref.
1077 SkASSERT(texture->getRefCnt() > 1);
1078 texture->setFlag((GrTextureFlags) GrTexture::kReturnToCache_FlagBit);
1080 SkASSERT(NULL != texture->getCacheEntry());
1085 GrTexture* set(GrContext* context,
1086 const GrTextureDesc& desc,
1087 GrContext::ScratchTexMatch match = GrContext::kApprox_ScratchTexMatch) {
1091 if (NULL != fContext) {
1092 fTexture = fContext->lockAndRefScratchTexture(desc, match);
1093 if (NULL == fTexture) {
1102 GrTexture* texture() { return fTexture; }
1105 GrContext* fContext;
1106 GrTexture* fTexture;