Remove code used by --disable-delegated-renderer on Mac

content/browser/renderer_host/compositing_iosurface_mac.mm

 // 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 "content/browser/renderer_host/compositing_iosurface_mac.h"
 
 #include <OpenGL/CGLIOSurface.h>
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/OpenGL.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/platform_thread.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/renderer_host/compositing_iosurface_context_mac.h"
-#include "content/browser/renderer_host/compositing_iosurface_shader_programs_mac.h"
-#include "content/browser/renderer_host/compositing_iosurface_transformer_mac.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 #include "content/common/content_constants_internal.h"
 #include "gpu/config/gpu_driver_bug_workaround_type.h"
 #include "media/base/video_util.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gl/gl_context.h"
 
 #ifdef NDEBUG
 #define CHECK_GL_ERROR()
 #define CHECK_AND_SAVE_GL_ERROR()
 #else
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error: " << gl_error; \
   } while (0)
 #define CHECK_AND_SAVE_GL_ERROR() do {                                  \
     GLenum gl_error = GetAndSaveGLError();                              \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error: " << gl_error; \
   } while (0)
 #endif
 
 namespace content {
-namespace {
-
-// How many times to test if asynchronous copy has completed.
-// This value is chosen such that we allow at most 1 second to finish a copy.
-const int kFinishCopyRetryCycles = 100;
-
-// Time in milliseconds to allow asynchronous copy to finish.
-// This value is shorter than 16ms such that copy can complete within a vsync.
-const int kFinishCopyPollingPeriodMs = 10;
-
-bool HasAppleFenceExtension() {
-  static bool initialized_has_fence = false;
-  static bool has_fence = false;
-
-  if (!initialized_has_fence) {
-    has_fence =
-        strstr(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)),
-               "GL_APPLE_fence") != NULL;
-    initialized_has_fence = true;
-  }
-  return has_fence;
-}
-
-bool HasPixelBufferObjectExtension() {
-  static bool initialized_has_pbo = false;
-  static bool has_pbo = false;
-
-  if (!initialized_has_pbo) {
-    has_pbo =
-        strstr(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)),
-               "GL_ARB_pixel_buffer_object") != NULL;
-    initialized_has_pbo = true;
-  }
-  return has_pbo;
-}
-
-// Helper function to reverse the argument order.  Also takes ownership of
-// |bitmap_output| for the life of the binding.
-void ReverseArgumentOrder(
-    const base::Callback<void(bool, const SkBitmap&)>& callback,
-    scoped_ptr<SkBitmap> bitmap_output, bool success) {
-  callback.Run(success, *bitmap_output);
-}
-
-// Called during an async GPU readback with a pointer to the pixel buffer.  In
-// the snapshot path, we just memcpy the data into our output bitmap since the
-// width, height, and stride should all be equal.
-bool MapBufferToSkBitmap(const SkBitmap* output, const void* buf, int ignored) {
-  TRACE_EVENT0("browser", "MapBufferToSkBitmap");
-
-  if (buf) {
-    SkAutoLockPixels output_lock(*output);
-    memcpy(output->getPixels(), buf, output->getSize());
-  }
-  return buf != NULL;
-}
-
-// Copies tightly-packed scanlines from |buf| to |region_in_frame| in the given
-// |target| VideoFrame's |plane|.  Assumption: |buf|'s width is
-// |region_in_frame.width()| and its stride is always in 4-byte alignment.
-//
-// TODO(miu): Refactor by moving this function into media/video_util.
-// http://crbug.com/219779
-bool MapBufferToVideoFrame(
-    const scoped_refptr<media::VideoFrame>& target,
-    const gfx::Rect& region_in_frame,
-    const void* buf,
-    int plane) {
-  COMPILE_ASSERT(media::VideoFrame::kYPlane == 0, VideoFrame_kYPlane_mismatch);
-  COMPILE_ASSERT(media::VideoFrame::kUPlane == 1, VideoFrame_kUPlane_mismatch);
-  COMPILE_ASSERT(media::VideoFrame::kVPlane == 2, VideoFrame_kVPlane_mismatch);
-
-  TRACE_EVENT1("browser", "MapBufferToVideoFrame", "plane", plane);
-
-  // Apply black-out in the regions surrounding the view area (for
-  // letterboxing/pillarboxing).  Only do this once, since this is performed on
-  // all planes in the VideoFrame here.
-  if (plane == 0)
-    media::LetterboxYUV(target.get(), region_in_frame);
-
-  if (buf) {
-    int packed_width = region_in_frame.width();
-    int packed_height = region_in_frame.height();
-    // For planes 1 and 2, the width and height are 1/2 size (rounded up).
-    if (plane > 0) {
-      packed_width = (packed_width + 1) / 2;
-      packed_height = (packed_height + 1) / 2;
-    }
-    const uint8* src = reinterpret_cast<const uint8*>(buf);
-    const int src_stride = (packed_width % 4 == 0 ?
-                                packed_width :
-                                (packed_width + 4 - (packed_width % 4)));
-    const uint8* const src_end = src + packed_height * src_stride;
-
-    // Calculate starting offset and stride into the destination buffer.
-    const int dst_stride = target->stride(plane);
-    uint8* dst = target->data(plane);
-    if (plane == 0)
-      dst += (region_in_frame.y() * dst_stride) + region_in_frame.x();
-    else
-      dst += (region_in_frame.y() / 2 * dst_stride) + (region_in_frame.x() / 2);
-
-    // Copy each row, accounting for strides in the source and destination.
-    for (; src < src_end; src += src_stride, dst += dst_stride)
-      memcpy(dst, src, packed_width);
-  }
-  return buf != NULL;
-}
-
-}  // namespace
-
-CompositingIOSurfaceMac::CopyContext::CopyContext(
-    const scoped_refptr<CompositingIOSurfaceContext>& context)
-  : transformer(new CompositingIOSurfaceTransformer(
-        GL_TEXTURE_RECTANGLE_ARB, true, context->shader_program_cache())),
-    output_readback_format(GL_BGRA),
-    num_outputs(0),
-    fence(0),
-    cycles_elapsed(0) {
-  memset(output_textures, 0, sizeof(output_textures));
-  memset(frame_buffers, 0, sizeof(frame_buffers));
-  memset(pixel_buffers, 0, sizeof(pixel_buffers));
-}
-
-CompositingIOSurfaceMac::CopyContext::~CopyContext() {
-  DCHECK_EQ(frame_buffers[0], 0u) << "Failed to call ReleaseCachedGLObjects().";
-}
-
-void CompositingIOSurfaceMac::CopyContext::ReleaseCachedGLObjects() {
-  // No outstanding callbacks should be pending.
-  DCHECK(map_buffer_callback.is_null());
-  DCHECK(done_callback.is_null());
-
-  // For an asynchronous read-back, there are more objects to delete:
-  if (fence) {
-    glDeleteBuffers(arraysize(pixel_buffers), pixel_buffers); CHECK_GL_ERROR();
-    memset(pixel_buffers, 0, sizeof(pixel_buffers));
-    glDeleteFencesAPPLE(1, &fence); CHECK_GL_ERROR();
-    fence = 0;
-  }
-
-  glDeleteFramebuffersEXT(arraysize(frame_buffers), frame_buffers);
-  CHECK_GL_ERROR();
-  memset(frame_buffers, 0, sizeof(frame_buffers));
-
-  // Note: |output_textures| are owned by the transformer.
-  if (transformer)
-    transformer->ReleaseCachedGLObjects();
-}
-
-void CompositingIOSurfaceMac::CopyContext::PrepareReadbackFramebuffers() {
-  for (int i = 0; i < num_outputs; ++i) {
-    if (!frame_buffers[i]) {
-      glGenFramebuffersEXT(1, &frame_buffers[i]); CHECK_GL_ERROR();
-    }
-  }
-}
-
-void CompositingIOSurfaceMac::CopyContext::PrepareForAsynchronousReadback() {
-  PrepareReadbackFramebuffers();
-  if (!fence) {
-    glGenFencesAPPLE(1, &fence); CHECK_GL_ERROR();
-  }
-  for (int i = 0; i < num_outputs; ++i) {
-    if (!pixel_buffers[i]) {
-      glGenBuffersARB(1, &pixel_buffers[i]); CHECK_GL_ERROR();
-    }
-  }
-}
-
 
 // static
 scoped_refptr<CompositingIOSurfaceMac> CompositingIOSurfaceMac::Create() {
   scoped_refptr<CompositingIOSurfaceContext> offscreen_context =
       CompositingIOSurfaceContext::Get(
           CompositingIOSurfaceContext::kOffscreenContextWindowNumber);
   if (!offscreen_context) {
     LOG(ERROR) << "Failed to create context for offscreen operations";
     return NULL;
   }
 
   return new CompositingIOSurfaceMac(offscreen_context);
 }
 
 CompositingIOSurfaceMac::CompositingIOSurfaceMac(
     const scoped_refptr<CompositingIOSurfaceContext>& offscreen_context)
     : offscreen_context_(offscreen_context),
       io_surface_handle_(0),
       scale_factor_(1.f),
       texture_(0),
-      finish_copy_timer_(
-          FROM_HERE,
-          base::TimeDelta::FromMilliseconds(kFinishCopyPollingPeriodMs),
-          base::Bind(&CompositingIOSurfaceMac::CheckIfAllCopiesAreFinished,
-                     base::Unretained(this),
-                     false),
-          true),
       gl_error_(GL_NO_ERROR),
       eviction_queue_iterator_(eviction_queue_.Get().end()),
       eviction_has_been_drawn_since_updated_(false) {
   CHECK(offscreen_context_);
 }
 
 CompositingIOSurfaceMac::~CompositingIOSurfaceMac() {
-  FailAllCopies();
   {
     gfx::ScopedCGLSetCurrentContext scoped_set_current_context(
         offscreen_context_->cgl_context());
-    DestroyAllCopyContextsWithinContext();
     UnrefIOSurfaceWithContextCurrent();
   }
   offscreen_context_ = NULL;
   DCHECK(eviction_queue_iterator_ == eviction_queue_.Get().end());
 }
 
 bool CompositingIOSurfaceMac::SetIOSurfaceWithContextCurrent(
     scoped_refptr<CompositingIOSurfaceContext> current_context,
     IOSurfaceID io_surface_handle,
     const gfx::Size& size,
@@ skipping 38 matching lines @@
   // Note that the projection keeps things in view units, so the use of
   // window_rect / dip_io_surface_size_ (as opposed to the pixel_ variants)
   // below is correct.
   glOrtho(0, window_rect.width(), window_rect.height(), 0, -1, 1);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
 
   glDisable(GL_DEPTH_TEST);
   glDisable(GL_BLEND);
 
+  glColor4f(1, 1, 1, 1);
   if (has_io_surface) {
-    drawing_context->shader_program_cache()->UseBlitProgram();
-    glActiveTexture(GL_TEXTURE0);
+    glEnable(GL_TEXTURE_RECTANGLE_ARB);
     glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_);
-
     DrawQuad(quad);
-
-    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); CHECK_AND_SAVE_GL_ERROR();
+    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
+    glDisable(GL_TEXTURE_RECTANGLE_ARB);
+    CHECK_AND_SAVE_GL_ERROR();
 
     // Fill the resize gutters with white.
     if (window_rect.width() > dip_io_surface_size_.width() ||
         window_rect.height() > dip_io_surface_size_.height()) {
-      drawing_context->shader_program_cache()->UseSolidWhiteProgram();
       SurfaceQuad filler_quad;
       if (window_rect.width() > dip_io_surface_size_.width()) {
         // Draw right-side gutter down to the bottom of the window.
         filler_quad.set_rect(dip_io_surface_size_.width(), 0.0f,
                              window_rect.width(), window_rect.height());
         DrawQuad(filler_quad);
       }
       if (window_rect.height() > dip_io_surface_size_.height()) {
         // Draw bottom gutter to the width of the IOSurface.
         filler_quad.set_rect(
             0.0f, dip_io_surface_size_.height(),
             dip_io_surface_size_.width(), window_rect.height());
         DrawQuad(filler_quad);
       }
     }
 
     // Workaround for issue 158469. Issue a dummy draw call with texture_ not
-    // bound to blit_rgb_sampler_location_, in order to shake all references
-    // to the IOSurface out of the driver.
+    // bound to a texture, in order to shake all references to the IOSurface out
+    // of the driver.
     glBegin(GL_TRIANGLES);
     glEnd();
-
-    glUseProgram(0); CHECK_AND_SAVE_GL_ERROR();
+    CHECK_AND_SAVE_GL_ERROR();
   } else {
     // Should match the clear color of RenderWidgetHostViewMac.
     glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
   }
 
   bool workaround_needed =
       GpuDataManagerImpl::GetInstance()->IsDriverBugWorkaroundActive(
           gpu::FORCE_GL_FINISH_AFTER_COMPOSITING);
   if (workaround_needed) {
@@ skipping 12 matching lines @@
     // generate an error. Clear the GL error afterwards just in case.
     glClearColor(0.8, 0.8, 0.8, 1.0);
     glClear(GL_COLOR_BUFFER_BIT);
     glGetError();
   }
 
   eviction_has_been_drawn_since_updated_ = true;
   return result;
 }
 
-void CompositingIOSurfaceMac::CopyTo(
-      const gfx::Rect& src_pixel_subrect,
-      const gfx::Size& dst_pixel_size,
-      const base::Callback<void(bool, const SkBitmap&)>& callback) {
-  scoped_ptr<SkBitmap> output(new SkBitmap());
-  if (!output->allocN32Pixels(
-          dst_pixel_size.width(), dst_pixel_size.height(), true)) {
-    DLOG(ERROR) << "Failed to allocate SkBitmap pixels!";
-    callback.Run(false, *output);
-    return;
-  }
-  DCHECK_EQ(output->rowBytesAsPixels(), dst_pixel_size.width())
-      << "Stride is required to be equal to width for GPU readback.";
-
-  base::Closure copy_done_callback;
-  {
-    gfx::ScopedCGLSetCurrentContext scoped_set_current_context(
-        offscreen_context_->cgl_context());
-    copy_done_callback = CopyToSelectedOutputWithinContext(
-        src_pixel_subrect, gfx::Rect(dst_pixel_size), false,
-        output.get(), NULL,
-        base::Bind(&ReverseArgumentOrder, callback, base::Passed(&output)));
-  }
-  if (!copy_done_callback.is_null())
-    copy_done_callback.Run();
-}
-
-void CompositingIOSurfaceMac::CopyToVideoFrame(
-    const gfx::Rect& src_pixel_subrect,
-    const scoped_refptr<media::VideoFrame>& target,
-    const base::Callback<void(bool)>& callback) {
-  base::Closure copy_done_callback;
-  {
-    gfx::ScopedCGLSetCurrentContext scoped_set_current_context(
-        offscreen_context_->cgl_context());
-    copy_done_callback = CopyToVideoFrameWithinContext(
-        src_pixel_subrect, false, target, callback);
-  }
-  if (!copy_done_callback.is_null())
-    copy_done_callback.Run();
-}
-
-base::Closure CompositingIOSurfaceMac::CopyToVideoFrameWithinContext(
-    const gfx::Rect& src_pixel_subrect,
-    bool called_within_draw,
-    const scoped_refptr<media::VideoFrame>& target,
-    const base::Callback<void(bool)>& callback) {
-  gfx::Rect region_in_frame = media::ComputeLetterboxRegion(
-      gfx::Rect(target->coded_size()), src_pixel_subrect.size());
-  // Make coordinates and sizes even because we letterbox in YUV space right
-  // now (see CopyRGBToVideoFrame). They need to be even for the UV samples to
-  // line up correctly.
-  region_in_frame = gfx::Rect(region_in_frame.x() & ~1,
-                              region_in_frame.y() & ~1,
-                              region_in_frame.width() & ~1,
-                              region_in_frame.height() & ~1);
-  DCHECK_LE(region_in_frame.right(), target->coded_size().width());
-  DCHECK_LE(region_in_frame.bottom(), target->coded_size().height());
-
-  return CopyToSelectedOutputWithinContext(
-      src_pixel_subrect, region_in_frame, called_within_draw,
-      NULL, target, callback);
-}
-
 bool CompositingIOSurfaceMac::MapIOSurfaceToTextureWithContextCurrent(
     const scoped_refptr<CompositingIOSurfaceContext>& current_context,
     const gfx::Size pixel_size,
     float scale_factor,
     IOSurfaceID io_surface_handle) {
   TRACE_EVENT0("browser", "CompositingIOSurfaceMac::MapIOSurfaceToTexture");
 
   if (!io_surface_ || io_surface_handle != io_surface_handle_)
     UnrefIOSurfaceWithContextCurrent();
 
@@ skipping 85 matching lines @@
   io_surface_.reset();
 
   // Forget the ID, because even if it is still around when we want to use it
   // again, OSX may have reused the same ID for a new tab and we don't want to
   // blit random tab contents.
   io_surface_handle_ = 0;
 
   EvictionMarkEvicted();
 }
 
-bool CompositingIOSurfaceMac::IsAsynchronousReadbackSupported() {
-  if (!HasAppleFenceExtension() && HasPixelBufferObjectExtension())
-    return false;
-  if (GpuDataManagerImpl::GetInstance()->IsDriverBugWorkaroundActive(
-          gpu::DISABLE_ASYNC_READPIXELS)) {
-    return false;
-  }
-  return true;
-}
-
 bool CompositingIOSurfaceMac::HasBeenPoisoned() const {
   return offscreen_context_->HasBeenPoisoned();
 }
 
-base::Closure CompositingIOSurfaceMac::CopyToSelectedOutputWithinContext(
-    const gfx::Rect& src_pixel_subrect,
-    const gfx::Rect& dst_pixel_rect,
-    bool called_within_draw,
-    const SkBitmap* bitmap_output,
-    const scoped_refptr<media::VideoFrame>& video_frame_output,
-    const base::Callback<void(bool)>& done_callback) {
-  DCHECK_NE(bitmap_output != NULL, video_frame_output.get() != NULL);
-  DCHECK(!done_callback.is_null());
-
-  // SWIZZLE_RGBA_FOR_ASYNC_READPIXELS workaround: Fall-back to synchronous
-  // readback for SkBitmap output since the Blit shader program doesn't support
-  // switchable output formats.
-  const bool require_sync_copy_for_workaround = bitmap_output &&
-      offscreen_context_->shader_program_cache()->rgb_to_yv12_output_format() ==
-          GL_RGBA;
-  const bool async_copy = !require_sync_copy_for_workaround &&
-      IsAsynchronousReadbackSupported();
-  TRACE_EVENT2(
-      "browser", "CompositingIOSurfaceMac::CopyToSelectedOutputWithinContext",
-      "output", bitmap_output ? "SkBitmap (ARGB)" : "VideoFrame (YV12)",
-      "async_readback", async_copy);
-
-  const gfx::Rect src_rect = IntersectWithIOSurface(src_pixel_subrect);
-  if (src_rect.IsEmpty() || dst_pixel_rect.IsEmpty())
-    return base::Bind(done_callback, false);
-
-  CopyContext* copy_context;
-  if (copy_context_pool_.empty()) {
-    // Limit the maximum number of simultaneous copies to two.  Rationale:
-    // Really, only one should ever be in-progress at a time, as we should
-    // depend on the speed of the hardware to rate-limit the copying naturally.
-    // In the asynchronous read-back case, the one currently in-flight copy is
-    // highly likely to have finished by this point (i.e., it's just waiting for
-    // us to make a glMapBuffer() call).  Therefore, we allow a second copy to
-    // be started here.
-    if (copy_requests_.size() >= 2)
-      return base::Bind(done_callback, false);
-    copy_context = new CopyContext(offscreen_context_);
-  } else {
-    copy_context = copy_context_pool_.back();
-    copy_context_pool_.pop_back();
-  }
-
-  if (!HasIOSurface())
-    return base::Bind(done_callback, false);
-
-  // Send transform commands to the GPU.
-  copy_context->num_outputs = 0;
-  if (bitmap_output) {
-    if (copy_context->transformer->ResizeBilinear(
-            texture_, src_rect, dst_pixel_rect.size(),
-            &copy_context->output_textures[0])) {
-      copy_context->output_readback_format = GL_BGRA;
-      copy_context->num_outputs = 1;
-      copy_context->output_texture_sizes[0] = dst_pixel_rect.size();
-    }
-  } else {
-    if (copy_context->transformer->TransformRGBToYV12(
-            texture_, src_rect, dst_pixel_rect.size(),
-            &copy_context->output_textures[0],
-            &copy_context->output_textures[1],
-            &copy_context->output_textures[2],
-            &copy_context->output_texture_sizes[0],
-            &copy_context->output_texture_sizes[1])) {
-      copy_context->output_readback_format =
-          offscreen_context_->shader_program_cache()->
-              rgb_to_yv12_output_format();
-      copy_context->num_outputs = 3;
-      copy_context->output_texture_sizes[2] =
-          copy_context->output_texture_sizes[1];
-    }
-  }
-  if (!copy_context->num_outputs)
-    return base::Bind(done_callback, false);
-
-  // In the asynchronous case, issue commands to the GPU and return a null
-  // closure here.  In the synchronous case, perform a blocking readback and
-  // return a callback to be run outside the CGL context to indicate success.
-  if (async_copy) {
-    copy_context->done_callback = done_callback;
-    AsynchronousReadbackForCopy(
-        dst_pixel_rect, called_within_draw, copy_context, bitmap_output,
-        video_frame_output);
-    copy_requests_.push_back(copy_context);
-    if (!finish_copy_timer_.IsRunning())
-      finish_copy_timer_.Reset();
-    return base::Closure();
-  } else {
-    const bool success = SynchronousReadbackForCopy(
-        dst_pixel_rect, copy_context, bitmap_output, video_frame_output);
-    return base::Bind(done_callback, success);
-  }
-}
-
-void CompositingIOSurfaceMac::AsynchronousReadbackForCopy(
-    const gfx::Rect& dst_pixel_rect,
-    bool called_within_draw,
-    CopyContext* copy_context,
-    const SkBitmap* bitmap_output,
-    const scoped_refptr<media::VideoFrame>& video_frame_output) {
-  copy_context->PrepareForAsynchronousReadback();
-
-  // Copy the textures to their corresponding PBO.
-  for (int i = 0; i < copy_context->num_outputs; ++i) {
-    TRACE_EVENT1(
-        "browser", "CompositingIOSurfaceMac::AsynchronousReadbackForCopy",
-        "plane", i);
-
-    // Attach the output texture to the FBO.
-    glBindFramebufferEXT(
-        GL_READ_FRAMEBUFFER_EXT, copy_context->frame_buffers[i]);
-    glFramebufferTexture2DEXT(
-        GL_READ_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-        GL_TEXTURE_RECTANGLE_ARB, copy_context->output_textures[i], 0);
-    DCHECK(glCheckFramebufferStatusEXT(GL_READ_FRAMEBUFFER_EXT) ==
-               GL_FRAMEBUFFER_COMPLETE_EXT);
-
-    // Create a PBO and issue an asynchronous read-back.
-    glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, copy_context->pixel_buffers[i]);
-    CHECK_AND_SAVE_GL_ERROR();
-    glBufferDataARB(GL_PIXEL_PACK_BUFFER_ARB,
-                    copy_context->output_texture_sizes[i].GetArea() * 4,
-                    NULL, GL_STREAM_READ_ARB);
-    CHECK_AND_SAVE_GL_ERROR();
-    glReadPixels(0, 0,
-                 copy_context->output_texture_sizes[i].width(),
-                 copy_context->output_texture_sizes[i].height(),
-                 copy_context->output_readback_format,
-                 GL_UNSIGNED_INT_8_8_8_8_REV, 0);
-    CHECK_AND_SAVE_GL_ERROR();
-  }
-
-  glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, 0); CHECK_AND_SAVE_GL_ERROR();
-  glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); CHECK_AND_SAVE_GL_ERROR();
-
-  glSetFenceAPPLE(copy_context->fence); CHECK_GL_ERROR();
-  copy_context->cycles_elapsed = 0;
-
-  // When this asynchronous copy happens in a draw operaton there is no need
-  // to explicitly flush because there will be a swap buffer and this flush
-  // hurts performance.
-  if (!called_within_draw) {
-    glFlush(); CHECK_AND_SAVE_GL_ERROR();
-  }
-
-  copy_context->map_buffer_callback = bitmap_output ?
-      base::Bind(&MapBufferToSkBitmap, bitmap_output) :
-      base::Bind(&MapBufferToVideoFrame, video_frame_output, dst_pixel_rect);
-}
-
-void CompositingIOSurfaceMac::CheckIfAllCopiesAreFinished(
-    bool block_until_finished) {
-  if (copy_requests_.empty())
-    return;
-
-  std::vector<base::Closure> done_callbacks;
-  {
-    gfx::ScopedCGLSetCurrentContext scoped_set_current_context(
-        offscreen_context_->cgl_context());
-    CheckIfAllCopiesAreFinishedWithinContext(
-        block_until_finished, &done_callbacks);
-  }
-  for (size_t i = 0; i < done_callbacks.size(); ++i)
-    done_callbacks[i].Run();
-}
-
-void CompositingIOSurfaceMac::CheckIfAllCopiesAreFinishedWithinContext(
-    bool block_until_finished,
-    std::vector<base::Closure>* done_callbacks) {
-  while (!copy_requests_.empty()) {
-    CopyContext* const copy_context = copy_requests_.front();
-
-    if (copy_context->fence && !glTestFenceAPPLE(copy_context->fence)) {
-      CHECK_AND_SAVE_GL_ERROR();
-      // Doing a glFinishFenceAPPLE can cause transparent window flashes when
-      // switching tabs, so only do it when required.
-      if (block_until_finished) {
-        glFinishFenceAPPLE(copy_context->fence);
-        CHECK_AND_SAVE_GL_ERROR();
-      } else if (copy_context->cycles_elapsed < kFinishCopyRetryCycles) {
-        ++copy_context->cycles_elapsed;
-        // This copy has not completed there is no need to test subsequent
-        // requests.
-        break;
-      }
-    }
-    CHECK_AND_SAVE_GL_ERROR();
-
-    bool success = true;
-    for (int i = 0; success && i < copy_context->num_outputs; ++i) {
-      TRACE_EVENT1(
-        "browser",
-        "CompositingIOSurfaceMac::CheckIfAllCopiesAreFinishedWithinContext",
-        "plane", i);
-
-      glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, copy_context->pixel_buffers[i]);
-      CHECK_AND_SAVE_GL_ERROR();
-
-      void* buf = glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY_ARB);
-      CHECK_AND_SAVE_GL_ERROR();
-      success &= copy_context->map_buffer_callback.Run(buf, i);
-      glUnmapBufferARB(GL_PIXEL_PACK_BUFFER_ARB); CHECK_AND_SAVE_GL_ERROR();
-    }
-    copy_context->map_buffer_callback.Reset();
-    glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, 0); CHECK_AND_SAVE_GL_ERROR();
-
-    copy_requests_.pop_front();
-    done_callbacks->push_back(base::Bind(copy_context->done_callback, success));
-    copy_context->done_callback.Reset();
-    copy_context_pool_.push_back(copy_context);
-  }
-  if (copy_requests_.empty())
-    finish_copy_timer_.Stop();
-
-  CHECK(copy_requests_.empty() || !block_until_finished);
-}
-
-bool CompositingIOSurfaceMac::SynchronousReadbackForCopy(
-    const gfx::Rect& dst_pixel_rect,
-    CopyContext* copy_context,
-    const SkBitmap* bitmap_output,
-    const scoped_refptr<media::VideoFrame>& video_frame_output) {
-  bool success = true;
-  copy_context->PrepareReadbackFramebuffers();
-  for (int i = 0; i < copy_context->num_outputs; ++i) {
-    TRACE_EVENT1(
-        "browser", "CompositingIOSurfaceMac::SynchronousReadbackForCopy",
-        "plane", i);
-
-    // Attach the output texture to the FBO.
-    glBindFramebufferEXT(
-        GL_READ_FRAMEBUFFER_EXT, copy_context->frame_buffers[i]);
-    glFramebufferTexture2DEXT(
-        GL_READ_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-        GL_TEXTURE_RECTANGLE_ARB, copy_context->output_textures[i], 0);
-    DCHECK(glCheckFramebufferStatusEXT(GL_READ_FRAMEBUFFER_EXT) ==
-               GL_FRAMEBUFFER_COMPLETE_EXT);
-
-    // Blocking read-back of pixels from textures.
-    void* buf;
-    // When data must be transferred into a VideoFrame one scanline at a time,
-    // it is necessary to allocate a separate buffer for glReadPixels() that can
-    // be populated one-shot.
-    //
-    // TODO(miu): Don't keep allocating/deleting this buffer for every frame.
-    // Keep it cached, allocated on first use.
-    scoped_ptr<uint32[]> temp_readback_buffer;
-    if (bitmap_output) {
-      // The entire SkBitmap is populated, never a region within.  So, read the
-      // texture directly into the bitmap's pixel memory.
-      buf = bitmap_output->getPixels();
-    } else {
-      // Optimization: If the VideoFrame is letterboxed (not pillarboxed), and
-      // its stride is equal to the stride of the data being read back, then
-      // readback directly into the VideoFrame's buffer to save a round of
-      // memcpy'ing.
-      //
-      // TODO(miu): Move these calculations into VideoFrame (need a CalcOffset()
-      // method).  http://crbug.com/219779
-      const int src_stride = copy_context->output_texture_sizes[i].width() * 4;
-      const int dst_stride = video_frame_output->stride(i);
-      if (src_stride == dst_stride && dst_pixel_rect.x() == 0) {
-        const int y_offset = dst_pixel_rect.y() / (i == 0 ? 1 : 2);
-        buf = video_frame_output->data(i) + y_offset * dst_stride;
-      } else {
-        // Create and readback into a temporary buffer because the data must be
-        // transferred to VideoFrame's pixel memory one scanline at a time.
-        temp_readback_buffer.reset(
-            new uint32[copy_context->output_texture_sizes[i].GetArea()]);
-        buf = temp_readback_buffer.get();
-      }
-    }
-    glReadPixels(0, 0,
-                 copy_context->output_texture_sizes[i].width(),
-                 copy_context->output_texture_sizes[i].height(),
-                 copy_context->output_readback_format,
-                 GL_UNSIGNED_INT_8_8_8_8_REV, buf);
-    CHECK_AND_SAVE_GL_ERROR();
-    if (video_frame_output.get()) {
-      if (!temp_readback_buffer) {
-        // Apply letterbox black-out around view region.
-        media::LetterboxYUV(video_frame_output.get(), dst_pixel_rect);
-      } else {
-        // Copy from temporary buffer and fully render the VideoFrame.
-        success &= MapBufferToVideoFrame(video_frame_output, dst_pixel_rect,
-                                         temp_readback_buffer.get(), i);
-      }
-    }
-  }
-
-  glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0); CHECK_AND_SAVE_GL_ERROR();
-  copy_context_pool_.push_back(copy_context);
-  return success;
-}
-
-void CompositingIOSurfaceMac::FailAllCopies() {
-  for (size_t i = 0; i < copy_requests_.size(); ++i) {
-    copy_requests_[i]->map_buffer_callback.Reset();
-
-    base::Callback<void(bool)>& done_callback =
-        copy_requests_[i]->done_callback;
-    if (!done_callback.is_null()) {
-      done_callback.Run(false);
-      done_callback.Reset();
-    }
-  }
-}
-
-void CompositingIOSurfaceMac::DestroyAllCopyContextsWithinContext() {
-  // Move all in-flight copies, if any, back into the pool.  Then, destroy all
-  // the CopyContexts in the pool.
-  copy_context_pool_.insert(copy_context_pool_.end(),
-                            copy_requests_.begin(), copy_requests_.end());
-  copy_requests_.clear();
-  while (!copy_context_pool_.empty()) {
-    scoped_ptr<CopyContext> copy_context(copy_context_pool_.back());
-    copy_context_pool_.pop_back();
-    copy_context->ReleaseCachedGLObjects();
-  }
-}
-
-gfx::Rect CompositingIOSurfaceMac::IntersectWithIOSurface(
-    const gfx::Rect& rect) const {
-  return gfx::IntersectRects(rect,
-      gfx::ToEnclosingRect(gfx::Rect(pixel_io_surface_size_)));
-}
-
 GLenum CompositingIOSurfaceMac::GetAndSaveGLError() {
   GLenum gl_error = glGetError();
   if (gl_error_ == GL_NO_ERROR)
     gl_error_ = gl_error;
   return gl_error;
 }
 
 void CompositingIOSurfaceMac::EvictionMarkUpdated() {
   EvictionMarkEvicted();
   eviction_queue_.Get().push_back(this);
@@ skipping 35 matching lines @@
 
     // If the number of IOSurfaces allocated is less than the threshold,
     // stop walking the list of surfaces.
     if (eviction_queue_.Get().size() <= kMaximumUnevictedSurfaces)
       break;
 
     // Don't evict anything that has not yet been drawn.
     if (!surface->eviction_has_been_drawn_since_updated_)
       continue;
 
-    // Don't evict anything with pending copy requests.
-    if (!surface->copy_requests_.empty())
-      continue;
-
     // Evict the surface.
     surface->UnrefIOSurface();
   }
 }
 
 // static
 base::LazyInstance<CompositingIOSurfaceMac::EvictionQueue>
     CompositingIOSurfaceMac::eviction_queue_;
 
 // static
 bool CompositingIOSurfaceMac::eviction_scheduled_ = false;
 
 }  // namespace content