Add support to dump font cache texture for debug purposes

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"
 #include "GrAtlas.h"
 #include "GrContext.h"
 #include "GrDrawTarget.h"
 #include "GrFontScaler.h"
 #include "GrIndexBuffer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkPath.h"
+#include "SkRTConf.h"
 #include "SkStrokeRec.h"
 #include "effects/GrCustomCoordsTextureEffect.h"
 
 static const int kGlyphCoordsAttributeIndex = 1;
 
+SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
+                "Dump the contents of the font cache before every purge.");
+
 void GrTextContext::flushGlyphs() {
     if (NULL == fDrawTarget) {
         return;
     }
 
     GrDrawState* drawState = fDrawTarget->drawState();
     GrDrawState::AutoRestoreEffects are(drawState);
     drawState->setFromPaint(fPaint, SkMatrix::I(), fContext->getRenderTarget());
 
     if (fCurrVertex > 0) {
@@ skipping 120 matching lines @@
         if (fStrike->getGlyphAtlas(glyph, scaler, drawToken)) {
             goto HAS_ATLAS;
         }
 
         // try to clear out an unused plot before we flush
         fContext->getFontCache()->freePlotExceptFor(fStrike);
         if (fStrike->getGlyphAtlas(glyph, scaler, drawToken)) {
             goto HAS_ATLAS;
         }
 
+        if (c_DumpFontCache) {
+            fContext->getFontCache()->dump();
+        }
+
         // before we purge the cache, we must flush any accumulated draws
         this->flushGlyphs();
         fContext->flush();
 
         // try to purge
         fContext->getFontCache()->purgeExceptFor(fStrike);
         // need to use new flush count here
         if (fStrike->getGlyphAtlas(glyph, scaler, drawToken)) {
             goto HAS_ATLAS;
         }
@@ skipping 75 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;
 }