Implement support for mixed sampled render targets

src/gpu/GrStencilAndCoverTextContext.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrStencilAndCoverTextContext.h"
 #include "GrAtlasTextContext.h"
 #include "GrBitmapTextContext.h"
@@ skipping 51 matching lines @@
         return false;
     }
 
     // No hairlines unless we can map the 1 px width to the object space.
     if (skPaint.getStyle() == SkPaint::kStroke_Style
         && skPaint.getStrokeWidth() == 0
         && viewMatrix.hasPerspective()) {
         return false;
     }
 
+    if (skPaint.isAntiAlias() &&
+        GrRenderTarget::kStencil_SampleConfig == rt->sampleConfig()) {
+        if (!paint.getXPFactory()->canTweakAlphaForCoverage()) {
+            return false;
+        }
+        // No Xfer processors that might do blending inside the shader.
+        // Coverage modulation for mixed samples is done *after* shading, so blending
+        // must occur in the ROP.
+        // TODO: Update Xfer processors to better support mixed samples.
+        if (paint.getXPFactory()->willNeedDstCopy(*fContext->getGpu()->caps(),
+                GrProcOptInfo(), GrProcOptInfo())) {
+            return false;
+        }
+    }
+
     // No color bitmap fonts.
     SkScalerContext::Rec    rec;
     SkScalerContext::MakeRec(skPaint, &fDeviceProperties, NULL, &rec);
     return rec.getFormat() != SkMask::kARGB32_Format;
 }
 
 void GrStencilAndCoverTextContext::onDrawText(GrRenderTarget* rt,
                                               const GrClip& clip,
                                               const GrPaint& paint,
                                               const SkPaint& skPaint,
@@ skipping 285 matching lines @@
         fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, NULL, true /*ignoreGamma*/);
         fGlyphs = canUseRawPaths ?
                       get_gr_glyphs(fContext, fSkPaint.getTypeface(), NULL, fStroke) :
                       get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(),
                                     &fGlyphCache->getDescriptor(), fStroke);
     }
 
     fStateRestore.set(&fPipelineBuilder);
 
     fPipelineBuilder.setFromPaint(fPaint, fRenderTarget, fClip);
+    SkASSERT(fRenderTarget->isMultisampled(GrRenderTarget::kStencil_BufferBit));
+    fPipelineBuilder.setState(GrPipelineBuilder::kHWAntialias_StateBit, fPaint.isAntiAlias());
 
     GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
                                  kZero_StencilOp,
                                  kZero_StencilOp,
                                  kNotEqual_StencilFunc,
                                  0xffff,
                                  0x0000,
                                  0xffff);
 
     *fPipelineBuilder.stencil() = kStencilPass;
@@ skipping 92 matching lines @@
 
     SkGlyphCache::AttachCache(fGlyphCache);
     fGlyphCache = NULL;
 
     fPipelineBuilder.stencil()->setDisabled();
     fStateRestore.set(NULL);
     fViewMatrix = fContextInitialMatrix;
     GrTextContext::finish();
 }