Dynamically create stencil buffer when needed.

src/gpu/GrContext.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrContext.h"
 
 #include "GrAARectRenderer.h"
 #include "GrBufferAllocPool.h"
 #include "GrDefaultGeoProcFactory.h"
 #include "GrFontCache.h"
 #include "GrGpuResource.h"
 #include "GrGpuResourcePriv.h"
 #include "GrDistanceFieldTextContext.h"
 #include "GrDrawTargetCaps.h"
 #include "GrGpu.h"
 #include "GrIndexBuffer.h"
 #include "GrInOrderDrawBuffer.h"
 #include "GrLayerCache.h"
 #include "GrOvalRenderer.h"
 #include "GrPathRenderer.h"
 #include "GrPathUtils.h"
+#include "GrRenderTargetPriv.h"
 #include "GrResourceCache.h"
 #include "GrSoftwarePathRenderer.h"
 #include "GrStencilAndCoverTextContext.h"
 #include "GrStrokeInfo.h"
 #include "GrSurfacePriv.h"
 #include "GrTexturePriv.h"
 #include "GrTraceMarker.h"
 #include "GrTracing.h"
 #include "SkDashPathPriv.h"
 #include "SkConfig8888.h"
@@ skipping 170 matching lines @@
     }
     if (resourceBytes) {
         *resourceBytes = fResourceCache->getBudgetedResourceBytes();
     }
 }
 
 GrTextContext* GrContext::createTextContext(GrRenderTarget* renderTarget,
                                             const SkDeviceProperties&
                                             leakyProperties,
                                             bool enableDistanceFieldFonts) {
-    if (fGpu->caps()->pathRenderingSupport() && renderTarget->getStencilBuffer() && 
-                                                renderTarget->isMultisampled()) {
-        return GrStencilAndCoverTextContext::Create(this, leakyProperties);
+    if (fGpu->caps()->pathRenderingSupport() && renderTarget->isMultisampled()) {
+        GrStencilBuffer* sb = renderTarget->renderTargetPriv().attachStencilBuffer();
+        if (sb) {
+            return GrStencilAndCoverTextContext::Create(this, leakyProperties);
+        }
     } 
 
     return GrDistanceFieldTextContext::Create(this, leakyProperties, enableDistanceFieldFonts);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 enum ScratchTextureFlags {
     kExact_ScratchTextureFlag           = 0x1,
     kNoPendingIO_ScratchTextureFlag     = 0x2,
     kNoCreate_ScratchTextureFlag        = 0x4,
@@ skipping 42 matching lines @@
         }
         if (calledDuringFlush) {
             flags |= kNoPendingIO_ScratchTextureFlag;
         }
         return this->internalRefScratchTexture(desc, flags);
     }
 }
 
 GrTexture* GrContext::internalRefScratchTexture(const GrSurfaceDesc& inDesc, uint32_t flags) {
     SkASSERT(!GrPixelConfigIsCompressed(inDesc.fConfig));
-    // kNoStencil has no meaning if kRT isn't set.
-    SkASSERT((inDesc.fFlags & kRenderTarget_GrSurfaceFlag) ||
-             !(inDesc.fFlags & kNoStencil_GrSurfaceFlag));
 
     SkTCopyOnFirstWrite<GrSurfaceDesc> desc(inDesc);
 
     if (fGpu->caps()->reuseScratchTextures() || (desc->fFlags & kRenderTarget_GrSurfaceFlag)) {
-        GrSurfaceFlags origFlags = desc->fFlags;
         if (!(kExact_ScratchTextureFlag & flags)) {
             // bin by pow2 with a reasonable min
             static const int MIN_SIZE = 16;
             GrSurfaceDesc* wdesc = desc.writable();
             wdesc->fWidth  = SkTMax(MIN_SIZE, GrNextPow2(desc->fWidth));
             wdesc->fHeight = SkTMax(MIN_SIZE, GrNextPow2(desc->fHeight));
         }
 
-        do {
-            GrScratchKey key;
-            GrTexturePriv::ComputeScratchKey(*desc, &key);
-            uint32_t scratchFlags = 0;
-            if (kNoPendingIO_ScratchTextureFlag & flags) {
-                scratchFlags = GrResourceCache::kRequireNoPendingIO_ScratchFlag;
-            } else  if (!(desc->fFlags & kRenderTarget_GrSurfaceFlag)) {
-                // If it is not a render target then it will most likely be populated by
-                // writePixels() which will trigger a flush if the texture has pending IO.
-                scratchFlags = GrResourceCache::kPreferNoPendingIO_ScratchFlag;
+        GrScratchKey key;
+        GrTexturePriv::ComputeScratchKey(*desc, &key);
+        uint32_t scratchFlags = 0;
+        if (kNoPendingIO_ScratchTextureFlag & flags) {
+            scratchFlags = GrResourceCache::kRequireNoPendingIO_ScratchFlag;
+        } else  if (!(desc->fFlags & kRenderTarget_GrSurfaceFlag)) {
+            // If it is not a render target then it will most likely be populated by
+            // writePixels() which will trigger a flush if the texture has pending IO.
+            scratchFlags = GrResourceCache::kPreferNoPendingIO_ScratchFlag;
+        }
+        GrGpuResource* resource = fResourceCache->findAndRefScratchResource(key, scratchFlags);
+        if (resource) {
+            GrSurface* surface = static_cast<GrSurface*>(resource);
+            GrRenderTarget* rt = surface->asRenderTarget();
+            if (rt && fGpu->caps()->discardRenderTargetSupport()) {
+                rt->discard();
             }
-            GrGpuResource* resource = fResourceCache->findAndRefScratchResource(key, scratchFlags);
-            if (resource) {
-                GrSurface* surface = static_cast<GrSurface*>(resource);
-                GrRenderTarget* rt = surface->asRenderTarget();
-                if (rt && fGpu->caps()->discardRenderTargetSupport()) {
-                    rt->discard();
-                }
-                return surface->asTexture();
-            }
-
-            if (kExact_ScratchTextureFlag & flags) {
-                break;
-            }
-            // We had a cache miss and we are in approx mode, relax the fit of the flags.
-
-            // We no longer try to reuse textures that were previously used as render targets in
-            // situations where no RT is needed; doing otherwise can confuse the video driver and
-            // cause significant performance problems in some cases.
-            if (desc->fFlags & kNoStencil_GrSurfaceFlag) {
-                desc.writable()->fFlags = desc->fFlags & ~kNoStencil_GrSurfaceFlag;
-            } else {
-                break;
-            }
-
-        } while (true);
-
-        desc.writable()->fFlags = origFlags;
+            return surface->asTexture();
+        }
     }
 
     if (!(kNoCreate_ScratchTextureFlag & flags)) {
         return fGpu->createTexture(*desc, true, NULL, 0);
     }
 
     return NULL;
 }
 
 void GrContext::OverBudgetCB(void* data) {
@@ skipping 1262 matching lines @@
     }
 }
 
 void GrContext::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
     fGpu->removeGpuTraceMarker(marker);
     if (fDrawBuffer) {
         fDrawBuffer->removeGpuTraceMarker(marker);
     }
 }