Dynamically create stencil buffer when needed.

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 #include "GrXferProcessor.h"
@@ skipping 180 matching lines @@
 GrTexture* stretch_texture_to_next_pot(GrTexture* inputTexture, Stretch stretch,
                                        SkPixelRef* pixelRef,
                                        const GrUniqueKey& optionalKey) {
     SkASSERT(kNo_Stretch != stretch);
 
     GrContext* context = inputTexture->getContext();
     SkASSERT(context);
 
     // Either it's a cache miss or the original wasn't cached to begin with.
     GrSurfaceDesc rtDesc = inputTexture->desc();
-    rtDesc.fFlags =  rtDesc.fFlags |
-                     kRenderTarget_GrSurfaceFlag |
-                     kNoStencil_GrSurfaceFlag;
+    rtDesc.fFlags =  rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
     rtDesc.fWidth  = GrNextPow2(rtDesc.fWidth);
     rtDesc.fHeight = GrNextPow2(rtDesc.fHeight);
     rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);
 
     // If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
     // fail.
     if (!context->isConfigRenderable(rtDesc.fConfig, false)) {
         if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
             if (context->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
                 rtDesc.fConfig = kAlpha_8_GrPixelConfig;
@@ skipping 156 matching lines @@
         yuvTextures[i].reset(
             ctx->refScratchTexture(yuvDesc, GrContext::kApprox_ScratchTexMatch));
         if (!yuvTextures[i] ||
             !yuvTextures[i]->writePixels(0, 0, yuvDesc.fWidth, yuvDesc.fHeight,
                                          yuvDesc.fConfig, planes[i], yuvInfo.fRowBytes[i])) {
             return NULL;
         }
     }
 
     GrSurfaceDesc rtDesc = desc;
-    rtDesc.fFlags = rtDesc.fFlags |
-                    kRenderTarget_GrSurfaceFlag |
-                    kNoStencil_GrSurfaceFlag;
+    rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
 
     GrTexture* result = create_texture_for_bmp(ctx, optionalKey, rtDesc, pixelRef, NULL, 0);
     if (!result) {
         return NULL;
     }
 
     GrRenderTarget* renderTarget = result->asRenderTarget();
     SkASSERT(renderTarget);
 
     SkAutoTUnref<GrFragmentProcessor>
@@ skipping 325 matching lines @@
         if (shader->asFragmentProcessor(context, skPaint, viewM, NULL, &paintColor, &fp) && fp) {
             grPaint->addColorProcessor(fp)->unref();
             constantColor = false;
         }
     }
 
     // The grcolor is automatically set when calling asFragmentProcessor.
     // If the shader can be seen as an effect it returns true and adds its effect to the grpaint.
     SkPaint2GrPaintNoShader(context, rt, skPaint, paintColor, constantColor, grPaint);
 }