[cc] Add nearest neighbor filtering for PictureLayer.

cc/output/software_renderer.cc

 // Copyright 2012 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 "cc/output/software_renderer.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 329 matching lines @@
       gfx::RectFToSkRect(quad->tex_coord_rect),
       gfx::RectFToSkRect(QuadVertexRect()),
       SkMatrix::kFill_ScaleToFit);
   current_canvas_->concat(content_matrix);
 
   // TODO(aelias): This isn't correct in all cases. We should detect these
   // cases and fall back to a persistent bitmap backing
   // (http://crbug.com/280374).
   skia::RefPtr<SkDrawFilter> opacity_filter =
       skia::AdoptRef(new skia::OpacityDrawFilter(
-          quad->opacity(), frame->disable_picture_quad_image_filtering));
+          quad->opacity(), frame->disable_picture_quad_image_filtering ||
+                               quad->nearest_neighbor));
   DCHECK(!current_canvas_->getDrawFilter());
   current_canvas_->setDrawFilter(opacity_filter.get());
 
   TRACE_EVENT0("cc",
                "SoftwareRenderer::DrawPictureQuad");
 
   quad->raster_source->PlaybackToSharedCanvas(
       current_canvas_, quad->content_rect, quad->contents_scale);
 
   current_canvas_->setDrawFilter(NULL);
@@ skipping 81 matching lines @@
   if (!lock.valid())
     return;
   DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
 
   gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
       quad->tex_coord_rect, quad->rect, quad->visible_rect);
   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
       QuadVertexRect(), quad->rect, quad->visible_rect);
 
   SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
-  current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
+  current_paint_.setFilterLevel(quad->nearest_neighbor
+                                    ? SkPaint::kNone_FilterLevel
+                                    : SkPaint::kLow_FilterLevel);
   current_canvas_->drawBitmapRectToRect(
       *lock.sk_bitmap(),
       &uv_rect,
       gfx::RectFToSkRect(visible_quad_vertex_rect),
       &current_paint_);
 }
 
 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
                                           const RenderPassDrawQuad* quad) {
   ScopedResource* content_texture =
@@ skipping 141 matching lines @@
 }
 
 void SoftwareRenderer::DidChangeVisibility() {
   if (visible())
     EnsureBackbuffer();
   else
     DiscardBackbuffer();
 }
 
 }  // namespace cc