Cache the GrEffect used for text rendering in GrBitmapTextContext.

src/gpu/GrBitmapTextContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBitmapTextContext.h"
 #include "GrAtlas.h"
 #include "GrDrawTarget.h"
@@ skipping 38 matching lines @@
 
 };
 
 GrBitmapTextContext::GrBitmapTextContext(GrContext* context,
                                          const SkDeviceProperties& properties)
                                        : GrTextContext(context, properties) {
     fStrike = NULL;
 
     fCurrTexture = NULL;
     fCurrVertex = 0;
+    fEffectTextureGenID = 0;
 
     fVertices = NULL;
     fMaxVertices = 0;
 
     fVertexBounds.setLargestInverted();
 }
 
 GrBitmapTextContext::~GrBitmapTextContext() {
     this->flushGlyphs();
 }
@@ skipping 17 matching lines @@
     GrDrawState* drawState = fDrawTarget->drawState();
     GrDrawState::AutoRestoreEffects are(drawState);
     drawState->setFromPaint(fPaint, SkMatrix::I(), fContext->getRenderTarget());
 
     if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
         SkASSERT(SkIsAlign4(fCurrVertex));
         SkASSERT(fCurrTexture);
         GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kNone_FilterMode);
 
+        uint32_t textureGenID = fCurrTexture->getGenerationID();
+        
+        if (textureGenID != fEffectTextureGenID) {
+            fCachedEffect.reset(GrCustomCoordsTextureEffect::Create(fCurrTexture, params));
+            fEffectTextureGenID = textureGenID;
+        }
+
         // This effect could be stored with one of the cache objects (atlas?)
         int coordsIdx = drawState->hasColorVertexAttribute() ? kGlyphCoordsWithColorAttributeIndex :
                                                                kGlyphCoordsNoColorAttributeIndex;
-        drawState->addCoverageEffect(
-                                GrCustomCoordsTextureEffect::Create(fCurrTexture, params),
-                                coordsIdx)->unref();
+        drawState->addCoverageEffect(fCachedEffect.get(), coordsIdx);
         SkASSERT(NULL != fStrike);
         switch (fStrike->getMaskFormat()) {
             // Color bitmap text
             case kARGB_GrMaskFormat:
                 SkASSERT(!drawState->hasColorVertexAttribute());
                 drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
                 drawState->setColor(0xffffffff);
                 break;
             // LCD text
             case kA888_GrMaskFormat:
@@ skipping 478 matching lines @@
     if (useColorVerts) {
         // color comes after position.
         GrColor* colors = reinterpret_cast<GrColor*>(positions + 1);
         for (int i = 0; i < 4; ++i) {
            *colors = fPaint.getColor();
            colors = reinterpret_cast<GrColor*>(reinterpret_cast<intptr_t>(colors) + vertSize);
         }
     }
     fCurrVertex += 4;
 }