Add XferProcessor factory in GrPaint and GrDrawState.

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 "GrDefaultGeoProcFactory.h"
@@ skipping 543 matching lines @@
         SkASSERT(fStrike);
         switch (fCurrMaskFormat) {
                 // Color bitmap text
             case kARGB_GrMaskFormat:
                 SkASSERT(!drawState.hasColorVertexAttribute());
                 drawState.setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
                 drawState.setAlpha(fSkPaint.getAlpha());
                 break;
                 // LCD text
             case kA565_GrMaskFormat: {
-                if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() ||
-                    kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() ||
-                    fPaint.numColorStages()) {
+                // TODO: move supportsRGBCoverage check to setupCoverageEffect and only add LCD
+                // processor if the xp can support it. For now we will simply assume that if
+                // fUseLCDText is true, then we have a known color output.
+                if (!drawState.getXPFactory()->supportsRGBCoverage(0, kRGBA_GrColorComponentFlags)) {
                     SkDebugf("LCD Text will not draw correctly.\n");
                 }
                 SkASSERT(!drawState.hasColorVertexAttribute());
                 // We don't use the GrPaint's color in this case because it's been premultiplied by
                 // alpha. Instead we feed in a non-premultiplied color, and multiply its alpha by
                 // the mask texture color. The end result is that we get
                 //            mask*paintAlpha*paintColor + (1-mask*paintAlpha)*dstColor
                 int a = SkColorGetA(fSkPaint.getColor());
                 // paintAlpha
                 drawState.setColor(SkColorSetARGB(a, a, a, a));
@@ skipping 34 matching lines @@
     }
 }
 
 inline void GrBitmapTextContext::finish() {
     this->flush();
     fTotalVertexCount = 0;
 
     GrTextContext::finish();
 }