Expose Blimp dependencies to the embedder

blimp/client/app/android/blimp_compositor_manager_android.cc

-// Copyright 2015 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 "blimp/client/app/android/blimp_compositor_manager_android.h"
-
-#include <algorithm>
-#include <memory>
-
-#include "base/command_line.h"
-#include "base/memory/ptr_util.h"
-#include "ui/gfx/geometry/size.h"
-
-namespace {
-// The minimum valid content width in a tile.  This is used to make sure the
-// width of the content on the rightmost tile isn't a tiny sliver.
-const int kMinimumTileContentWidthPixels = 64;
-}
-
-namespace blimp {
-namespace client {
-
-// static
-std::unique_ptr<BlimpCompositorManagerAndroid>
-BlimpCompositorManagerAndroid::Create(
-    const gfx::Size& real_size,
-    const gfx::Size& size,
-    RenderWidgetFeature* render_widget_feature,
-    cc::SurfaceManager* surface_manager,
-    BlimpGpuMemoryBufferManager* gpu_memory_buffer_manager,
-    SurfaceIdAllocationCallback callback) {
-  gfx::Size device_size(real_size);
-  bool real_size_supported = true;
-  if (device_size.IsEmpty()) {
-    real_size_supported = false;
-    device_size = size;
-  }
-  return base::WrapUnique(new BlimpCompositorManagerAndroid(
-      device_size, real_size_supported, render_widget_feature, surface_manager,
-      gpu_memory_buffer_manager, callback));
-}
-
-BlimpCompositorManagerAndroid::BlimpCompositorManagerAndroid(
-    const gfx::Size& size,
-    bool real_size_supported,
-    RenderWidgetFeature* render_widget_feature,
-    cc::SurfaceManager* surface_manager,
-    BlimpGpuMemoryBufferManager* gpu_memory_buffer_manager,
-    SurfaceIdAllocationCallback callback)
-    : BlimpCompositorManager(render_widget_feature,
-                             surface_manager,
-                             gpu_memory_buffer_manager,
-                             callback),
-      portrait_width_(std::min(size.width(), size.height())),
-      landscape_width_(std::max(size.width(), size.height())),
-      real_size_supported_(real_size_supported) {}
-
-BlimpCompositorManagerAndroid::~BlimpCompositorManagerAndroid() {}
-
-void BlimpCompositorManagerAndroid::GenerateLayerTreeSettings(
-    cc::LayerTreeSettings* settings) {
-  BlimpCompositorManager::GenerateLayerTreeSettings(settings);
-
-  // Calculate the correct raster tile size to use.  Assuming a square tile.
-  DCHECK_EQ(settings->default_tile_size.width(),
-            settings->default_tile_size.height());
-
-  int default_tile_size = settings->default_tile_size.width();
-  if (real_size_supported_) {
-    // Maximum HD dimensions should be 768x1280
-    // Maximum FHD dimensions should be 1200x1920
-    if (portrait_width_ > 768 || landscape_width_ > 1280)
-      default_tile_size = 384;
-    if (portrait_width_ > 1200 || landscape_width_ > 1920)
-      default_tile_size = 512;
-
-    // Adjust for some resolutions that barely straddle an extra
-    // tile when in portrait mode. This helps worst case scroll/raster
-    // by not needing a full extra tile for each row.
-    int right_tile_width = ((portrait_width_ - 1) % default_tile_size) + 1;
-    if (right_tile_width < kMinimumTileContentWidthPixels) {
-      // Figure out the new tile count without the small edge tile.
-      int full_tile_count = portrait_width_ / default_tile_size;
-      DCHECK_GT(full_tile_count, 0);
-
-      // Calculate the ideal new tile width with the new tile count.
-      default_tile_size = std::ceil(static_cast<float>(portrait_width_) /
-                                    static_cast<float>(full_tile_count));
-
-      // Round up to nearest 32 for GPU efficiency.
-      if (default_tile_size & 0x1F)
-        default_tile_size = (default_tile_size & ~0x1F) + 32;
-    }
-  } else {
-    // We don't know the exact resolution due to screen controls etc., so this
-    // just estimates the values above using tile counts.
-    int numTiles = (portrait_width_ * landscape_width_) / (256 * 256);
-    if (numTiles > 16)
-      default_tile_size = 384;
-    if (numTiles >= 40)
-      default_tile_size = 512;
-  }
-  settings->default_tile_size.SetSize(default_tile_size, default_tile_size);
-}
-
-}  // namespace client
-}  // namespace blimp