Add flag to enable rendering of text using signed distance fields.

cc/resources/resource_provider.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/resources/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 448 matching lines @@
       if (gr_context) {
         GrBackendTextureDesc desc;
         desc.fFlags = kRenderTarget_GrBackendTextureFlag;
         desc.fWidth = resource()->size.width();
         desc.fHeight = resource()->size.height();
         desc.fConfig = ToGrPixelConfig(resource()->format);
         desc.fOrigin = kTopLeft_GrSurfaceOrigin;
         desc.fTextureHandle = resource()->gl_id;
         skia::RefPtr<GrTexture> gr_texture =
             skia::AdoptRef(gr_context->wrapBackendTexture(desc));
-        surface = skia::AdoptRef(
-            SkSurface::NewRenderTargetDirect(gr_texture->asRenderTarget()));
+        SkSurface::TextRenderMode trm =
+            use_distance_field_text_ ? SkSurface::kDistanceField_TextRenderMode
+                                     : SkSurface::kStandard_TextRenderMode;
+        surface = skia::AdoptRef(SkSurface::NewRenderTargetDirect(
+            gr_texture->asRenderTarget(), trm));
       }
       break;
     }
     case Bitmap: {
       DCHECK(resource()->pixels);
       DCHECK_EQ(RGBA_8888, resource()->format);
       SkImageInfo image_info = SkImageInfo::MakeN32Premul(
           resource()->size.width(), resource()->size.height());
       surface = skia::AdoptRef(SkSurface::NewRasterDirect(
           image_info, resource()->pixels, image_info.minRowBytes()));
@@ skipping 104 matching lines @@
 
 ResourceProvider::Child::Child() : marked_for_deletion(false) {}
 
 ResourceProvider::Child::~Child() {}
 
 scoped_ptr<ResourceProvider> ResourceProvider::Create(
     OutputSurface* output_surface,
     SharedBitmapManager* shared_bitmap_manager,
     int highp_threshold_min,
     bool use_rgba_4444_texture_format,
-    size_t id_allocation_chunk_size) {
+    size_t id_allocation_chunk_size,
+    bool use_distance_field_text) {
   scoped_ptr<ResourceProvider> resource_provider(
       new ResourceProvider(output_surface,
                            shared_bitmap_manager,
                            highp_threshold_min,
                            use_rgba_4444_texture_format,
-                           id_allocation_chunk_size));
+                           id_allocation_chunk_size,
+                           use_distance_field_text));
 
   if (resource_provider->ContextGL())
     resource_provider->InitializeGL();
   else
     resource_provider->InitializeSoftware();
 
   DCHECK_NE(InvalidType, resource_provider->default_resource_type());
   return resource_provider.Pass();
 }
 
@@ skipping 628 matching lines @@
 }
 
 ResourceProvider::ScopedWriteLockSoftware::~ScopedWriteLockSoftware() {
   resource_provider_->UnlockForWrite(resource_id_);
 }
 
 ResourceProvider::ResourceProvider(OutputSurface* output_surface,
                                    SharedBitmapManager* shared_bitmap_manager,
                                    int highp_threshold_min,
                                    bool use_rgba_4444_texture_format,
-                                   size_t id_allocation_chunk_size)
+                                   size_t id_allocation_chunk_size,
+                                   bool use_distance_field_text)
     : output_surface_(output_surface),
       shared_bitmap_manager_(shared_bitmap_manager),
       lost_output_surface_(false),
       highp_threshold_min_(highp_threshold_min),
       next_id_(1),
       next_child_(1),
       default_resource_type_(InvalidType),
       use_texture_storage_ext_(false),
       use_texture_usage_hint_(false),
       use_compressed_texture_etc1_(false),
       max_texture_size_(0),
       best_texture_format_(RGBA_8888),
       use_rgba_4444_texture_format_(use_rgba_4444_texture_format),
       id_allocation_chunk_size_(id_allocation_chunk_size),
-      use_sync_query_(false) {
+      use_sync_query_(false),
+      use_distance_field_text_(use_distance_field_text) {
   DCHECK(output_surface_->HasClient());
   DCHECK(id_allocation_chunk_size_);
 }
 
 void ResourceProvider::InitializeSoftware() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_NE(Bitmap, default_resource_type_);
 
   CleanUpGLIfNeeded();
 
@@ skipping 475 matching lines @@
 }
 
 SkCanvas* ResourceProvider::MapDirectRasterBuffer(ResourceId id) {
   // Resource needs to be locked for write since DirectRasterBuffer writes
   // directly to it.
   LockForWrite(id);
   Resource* resource = GetResource(id);
   if (!resource->direct_raster_buffer.get()) {
     resource->direct_raster_buffer.reset(
         new DirectRasterBuffer(resource, this));
+    resource->direct_raster_buffer->SetUseDistanceFieldText(
+        use_distance_field_text_);
   }
   return resource->direct_raster_buffer->LockForWrite();
 }
 
 void ResourceProvider::UnmapDirectRasterBuffer(ResourceId id) {
   Resource* resource = GetResource(id);
   DCHECK(resource->direct_raster_buffer.get());
   resource->direct_raster_buffer->UnlockForWrite();
   UnlockForWrite(id);
 }
@@ skipping 504 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 class GrContext* ResourceProvider::GrContext() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc