Fix texture allocation in SWMaskHelper

https://codereview.chromium.org/19789006/



git-svn-id: http://skia.googlecode.com/svn/trunk@10197 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/GrClipMaskManager.cpp

@@ -993,7 +993,7 @@ GrTexture* GrClipMaskManager::createSoftwareClipMask(int32_t clipStackGenID,
         }
     }
 
-    helper.toTexture(result, kAllIn_InitialState == initialState ? 0xFF : 0x00);
+    helper.toTexture(result);
 
     fCurrClipMaskType = kAlpha_ClipMaskType;
     return result;

src/gpu/GrGpu.cpp

@@ -211,6 +211,7 @@ void GrGpu::clear(const SkIRect* rect,
         art.set(this->drawState(), renderTarget);
     }
     if (NULL == this->getDrawState().getRenderTarget()) {
+        GrAssert(0);
         return;
     }
     this->handleDirtyContext();

src/gpu/GrSWMaskHelper.cpp

@@ -130,22 +130,9 @@ bool GrSWMaskHelper::getTexture(GrAutoScratchTexture* texture) {
 /**
  * Move the result of the software mask generation back to the gpu
  */
-void GrSWMaskHelper::toTexture(GrTexture *texture, uint8_t alpha) {
+void GrSWMaskHelper::toTexture(GrTexture *texture) {
     SkAutoLockPixels alp(fBM);
 
-    // The destination texture is almost always larger than "fBM". Clear
-    // it appropriately so we don't get mask artifacts outside of the path's
-    // bounding box
-
-    // "texture" needs to be installed as the render target for the clear
-    // and the texture upload but cannot remain the render target upon
-    // return. Callers typically use it as a texture and it would then
-    // be both source and dest.
-    GrDrawState::AutoRenderTargetRestore artr(fContext->getGpu()->drawState(),
-                                              texture->asRenderTarget());
-
-    fContext->getGpu()->clear(NULL, GrColorPackRGBA(alpha, alpha, alpha, alpha));
-
     texture->writePixels(0, 0, fBM.width(), fBM.height(),
                          kAlpha_8_GrPixelConfig,
                          fBM.getPixels(), fBM.rowBytes());
@@ -177,7 +164,7 @@ GrTexture* GrSWMaskHelper::DrawPathMaskToTexture(GrContext* context,
         return NULL;
     }
 
-    helper.toTexture(ast.texture(), 0x00);
+    helper.toTexture(ast.texture());
 
     return ast.detach();
 }

src/gpu/GrSWMaskHelper.h

@@ -63,8 +63,7 @@ public:
     bool getTexture(GrAutoScratchTexture* texture);
 
     // Move the mask generation results from the internal bitmap to the gpu.
-    // The space outside of the mask is cleared using "alpha"
-    void toTexture(GrTexture* texture, uint8_t alpha);
+    void toTexture(GrTexture* texture);
 
     // Reset the internal bitmap
     void clear(uint8_t alpha) {