First pass at Rect Effect

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrTextureDomainEffect.h"
@@ skipping 653 matching lines @@
     /*
         We have special code for hairline strokes, miter-strokes, and fills.
         Anything else we just call our path code.
      */
     bool usePath = doStroke && width > 0 &&
                     paint.getStrokeJoin() != SkPaint::kMiter_Join;
     // another two reasons we might need to call drawPath...
     if (paint.getMaskFilter() || paint.getPathEffect()) {
         usePath = true;
     }
-    // until we aa rotated rects...
     if (!usePath && paint.isAntiAlias() && !fContext->getMatrix().rectStaysRect()) {
-        usePath = true;
+#ifdef SHADER_AA_FILL_RECT
+        if (doStroke) {
+#endif
+            usePath = true;
+#ifdef SHADER_AA_FILL_RECT
+        } else {
+            usePath = !fContext->getMatrix().preservesRightAngles();
+        }
+#endif
     }
     // small miter limit means right angles show bevel...
     if (SkPaint::kMiter_Join == paint.getStrokeJoin() &&
         paint.getStrokeMiter() < SK_ScalarSqrt2)
     {
         usePath = true;
     }
     // until we can both stroke and fill rectangles
     if (paint.getStyle() == SkPaint::kStrokeAndFill_Style) {
         usePath = true;
@@ skipping 1132 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     GrAssert(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }