gpu, cmaa: add glApplyScreenSpaceAntialiasingCHROMIUM unittests

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 16758 matching lines @@
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
         "glCreateAndConsumeTextureCHROMIUM", "invalid target");
     return;
   }
 
   texture_ref = texture_manager()->Consume(client_id, texture);
 }
 
 void GLES2DecoderImpl::DoApplyScreenSpaceAntialiasingCHROMIUM() {
+  Framebuffer* bound_framebuffer =
+      GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER);
+  // TODO(dshwang): support it even after glBindFrameBuffer(GL_FRAMEBUFFER, 0).
+  // skia will need to render to the window. crbug.com/656618
+  if (!bound_framebuffer) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
+                       "glApplyScreenSpaceAntialiasingCHROMIUM",
+                       "no bound framebuffer object");
+    return;
+  }
+
   // Apply CMAA(Conservative Morphological Anti-Aliasing) algorithm to the
   // color attachments of currently bound draw framebuffer.
   // Reference GL_INTEL_framebuffer_CMAA for details.
   // Use platform version if available.
   if (!feature_info_->feature_flags()
            .use_chromium_screen_space_antialiasing_via_shaders) {
     glApplyFramebufferAttachmentCMAAINTEL();
   } else {
     // Defer initializing the CopyTextureCHROMIUMResourceManager until it is
     // needed because it takes ??s of milliseconds to initialize.
     if (!apply_framebuffer_attachment_cmaa_intel_.get()) {
       LOCAL_COPY_REAL_GL_ERRORS_TO_WRAPPER(
           "glApplyFramebufferAttachmentCMAAINTEL");
       apply_framebuffer_attachment_cmaa_intel_.reset(
           new ApplyFramebufferAttachmentCMAAINTELResourceManager());
       apply_framebuffer_attachment_cmaa_intel_->Initialize(this);
       RestoreCurrentFramebufferBindings();
       if (LOCAL_PEEK_GL_ERROR("glApplyFramebufferAttachmentCMAAINTEL") !=
           GL_NO_ERROR)
         return;
     }
     apply_framebuffer_attachment_cmaa_intel_
-        ->ApplyFramebufferAttachmentCMAAINTEL(
-            this, GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER));
+        ->ApplyFramebufferAttachmentCMAAINTEL(this, bound_framebuffer);
   }
 }
 
 void GLES2DecoderImpl::DoInsertEventMarkerEXT(
     GLsizei length, const GLchar* marker) {
   if (!marker) {
     marker = "";
   }
   debug_marker_manager_.SetMarker(
       length ? std::string(marker, length) : std::string(marker));
@@ skipping 1852 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu