Use nearest neighbor filtering for non-translated quads

cc/tiled_layer_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "cc/tiled_layer_impl.h"
 
 #include "base/basictypes.h"
 #include "base/stringprintf.h"
@@ skipping 180 matching lines @@
             bool clipped = false;
             gfx::QuadF visibleContentInTargetQuad = MathUtil::mapQuad(drawTransform(), gfx::QuadF(visibleContentRect()), clipped);
             bool isAxisAlignedInTarget = !clipped && visibleContentInTargetQuad.IsRectilinear();
             bool useAA = m_tiler->hasBorderTexels() && !isAxisAlignedInTarget;
 
             bool leftEdgeAA = !i && useAA;
             bool topEdgeAA = !j && useAA;
             bool rightEdgeAA = i == m_tiler->numTilesX() - 1 && useAA;
             bool bottomEdgeAA = j == m_tiler->numTilesY() - 1 && useAA;
 
-            const GLint textureFilter = m_tiler->hasBorderTexels() ? GL_LINEAR : GL_NEAREST;
+            const GLint textureFilter = m_tiler->hasBorderTexels() && !drawTransform().isIdentityOrTranslation() ? GL_LINEAR : GL_NEAREST;

[jamesr, 2012/11/09 18:40:09]

for non-integer translations we still need GL_LINEAR, don't we?

[Sami, 2012/11/11 16:56:27]

Excellent point. I've changed this to use isIntegerTranslation() instead.

             quadSink.append(TileDrawQuad::create(sharedQuadState, tileRect, tileOpaqueRect, tile->resourceId(), textureOffset, textureSize, textureFilter, tile->contentsSwizzled(), leftEdgeAA, topEdgeAA, rightEdgeAA, bottomEdgeAA).PassAs<DrawQuad>(), appendQuadsData);
         }
     }
 }
 
 void TiledLayerImpl::setTilingData(const LayerTilingData& tiler)
 {
     if (m_tiler)
         m_tiler->reset();
     else
@@ skipping 34 matching lines @@
 {
     m_tiler->reset();
 }
 
 const char* TiledLayerImpl::layerTypeAsString() const
 {
     return "ContentLayer";
 }
 
 }  // namespace cc