Break GrTextContext's reliance on SkGpuDevice

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 "GrBlurUtils.h"
 #include "GrContext.h"
@@ skipping 83 matching lines @@
             return;
         }
         textContext = textContext->fFallbackTextContext;
     } while (textContext);
 
     // fall back to drawing as a path
     this->drawPosTextAsPath(drawContext, rt, clip, skPaint, viewMatrix, text, byteLength, pos,
                             scalarsPerPosition, offset, clipBounds);
 }
 
-void GrTextContext::drawTextBlob(SkGpuDevice* gpuDevice, GrRenderTarget* rt,
+bool GrTextContext::ShouldDisableLCD(const SkPaint& paint) {
+    if (paint.getShader() ||
+        !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode) ||
+        paint.getMaskFilter() ||
+        paint.getRasterizer() ||
+        paint.getColorFilter() ||
+        paint.getPathEffect() ||
+        paint.isFakeBoldText() ||
+        paint.getStyle() != SkPaint::kFill_Style)
+    {
+        return true;
+    }
+    return false;
+}
+
+uint32_t GrTextContext::FilterTextFlags(const SkDeviceProperties& devProps, const SkPaint& paint) {
+    uint32_t flags = paint.getFlags();
+
+    if (!paint.isLCDRenderText() || !paint.isAntiAlias()) {
+        return flags;
+    }
+
+    if (kUnknown_SkPixelGeometry == devProps.pixelGeometry() || ShouldDisableLCD(paint)) {
+        flags &= ~SkPaint::kLCDRenderText_Flag;
+        flags |= SkPaint::kGenA8FromLCD_Flag;
+    }
+
+    return flags;
+}
+
+void GrTextContext::drawTextBlob(GrRenderTarget* rt,
                                  const GrClip& clip, const SkPaint& skPaint,
                                  const SkMatrix& viewMatrix, const SkTextBlob* blob,
                                  SkScalar x, SkScalar y,
                                  SkDrawFilter* drawFilter, const SkIRect& clipBounds) {
     SkPaint runPaint = skPaint;
 
     SkTextBlob::RunIterator it(blob);
     for (;!it.done(); it.next()) {
         size_t textLen = it.glyphCount() * sizeof(uint16_t);
         const SkPoint& offset = it.offset();
         // applyFontToPaint() always overwrites the exact same attributes,
         // so it is safe to not re-seed the paint for this reason.
         it.applyFontToPaint(&runPaint);
 
         if (drawFilter && !drawFilter->filter(&runPaint, SkDrawFilter::kText_Type)) {
             // A false return from filter() means we should abort the current draw.
             runPaint = skPaint;
             continue;
         }
 
-        runPaint.setFlags(gpuDevice->filterTextFlags(runPaint));
+        runPaint.setFlags(FilterTextFlags(fDeviceProperties, runPaint));
 
         GrPaint grPaint;
         if (!SkPaint2GrPaint(fContext, fRenderTarget, runPaint, viewMatrix, true, &grPaint)) {
             return;
         }
 
         switch (it.positioning()) {
         case SkTextBlob::kDefault_Positioning:
             this->drawText(rt, clip, grPaint, runPaint, viewMatrix, (const char *)it.glyphs(),
                            textLen, x + offset.x(), y + offset.y(), clipBounds);
@@ skipping 128 matching lines @@
     if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
         scaler = (GrFontScaler*)auxData;
     }
     if (NULL == scaler) {
         scaler = SkNEW_ARGS(GrFontScaler, (cache));
         cache->setAuxProc(GlyphCacheAuxProc, scaler);
     }
 
     return scaler;
 }