GPU Font Cache improvements:

src/gpu/GrTextContext.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 "GrTextContext.h"
@@ skipping 135 matching lines @@
 //            SkCLZ(3);    // so we can set a break-point in the debugger
             return;
         }
     }
 
     if (NULL == glyph->fAtlas) {
         if (fStrike->getGlyphAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
+        // try to clear out an unused atlas before we flush
+        fContext->getFontCache()->freeAtlasExceptFor(fStrike);
+        if (fStrike->getGlyphAtlas(glyph, scaler)) {
+            goto HAS_ATLAS;
+        }
+
         // before we purge the cache, we must flush any accumulated draws
         this->flushGlyphs();
         fContext->flush();
 
         // try to purge
         fContext->getFontCache()->purgeExceptFor(fStrike);
         if (fStrike->getGlyphAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
@@ skipping 74 matching lines @@
                                         SkFixedToFloat(vx + width),
                                         SkFixedToFloat(vy + height),
                                         2 * sizeof(SkPoint));
     fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty)),
                                           SkFixedToFloat(texture->normalizeFixedX(tx + width)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty + height)),
                                           2 * sizeof(SkPoint));
     fCurrVertex += 4;
 }