Change GrTextContext fallbacks to be a linked list chain.

src/gpu/GrDistanceFieldTextContext.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 "GrDistanceFieldTextContext.h"
 #include "GrAtlas.h"
+#include "GrBitmapTextContext.h"
 #include "GrDrawTarget.h"
 #include "GrDrawTargetCaps.h"
 #include "GrFontScaler.h"
 #include "GrGpu.h"
 #include "GrIndexBuffer.h"
 #include "GrStrokeInfo.h"
 #include "GrTexturePriv.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 
@@ skipping 53 matching lines @@
     fEffectTextureUniqueID = SK_InvalidUniqueID;
     fEffectColor = GrColor_ILLEGAL;
     fEffectFlags = 0;
 
     fVertices = NULL;
     fMaxVertices = 0;
 
     fVertexBounds.setLargestInverted();
 }
 
+GrDistanceFieldTextContext* GrDistanceFieldTextContext::Create(GrContext* context,
+                                                               const SkDeviceProperties& props,
+                                                               bool enable) {
+    GrDistanceFieldTextContext* textContext = SkNEW_ARGS(GrDistanceFieldTextContext, 
+                                                         (context, props, enable));
+    textContext->fFallbackTextContext = GrBitmapTextContext::Create(context, props);
+
+    return textContext;
+}
+
 GrDistanceFieldTextContext::~GrDistanceFieldTextContext() {
     this->flush();
     SkSafeSetNull(fGammaTexture);
 }
 
 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) {
     if (!fEnableDFRendering && !paint.isDistanceFieldTextTEMP()) {
         return false;
     }
 
@@ skipping 97 matching lines @@
             return;
         }
 
         context->writeTexturePixels(*gammaTexture,
                                     0, 0, width, height,
                                     (*gammaTexture)->config(), data.get(), 0,
                                     GrContext::kDontFlush_PixelOpsFlag);
     }
 }
 
-void GrDistanceFieldTextContext::drawText(const GrPaint& paint, const SkPaint& skPaint,
+void GrDistanceFieldTextContext::onDrawText(const GrPaint& paint, const SkPaint& skPaint,
                                           const char text[], size_t byteLength,
                                           SkScalar x, SkScalar y) {
     SkASSERT(byteLength == 0 || text != NULL);
 
     // nothing to draw or can't draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/
         || fSkPaint.getRasterizer()) {
         return;
     }
 
@@ skipping 54 matching lines @@
                               fontScaler);
         }
 
         fx += SkFixedMul_portable(glyph.fAdvanceX, fixedScale);
         fy += SkFixedMul_portable(glyph.fAdvanceY, fixedScale);
     }
 
     this->finish();
 }
 
-void GrDistanceFieldTextContext::drawPosText(const GrPaint& paint, const SkPaint& skPaint,
+void GrDistanceFieldTextContext::onDrawPosText(const GrPaint& paint, const SkPaint& skPaint,
                                              const char text[], size_t byteLength,
                                              const SkScalar pos[], int scalarsPerPosition,
                                              const SkPoint& offset) {
 
     SkASSERT(byteLength == 0 || text != NULL);
     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
 
     // nothing to draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) {
         return;
@@ skipping 382 matching lines @@
         fVertexBounds.setLargestInverted();
     }
 }
 
 inline void GrDistanceFieldTextContext::finish() {
     this->flush();
 
     GrTextContext::finish();
 }