Initial commit of the blimp/ folder and target

blimp/client/compositor/blimp_compositor_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/compositor/blimp_compositor_android.h"
+
+#include <android/native_window_jni.h>
+
+#include "base/command_line.h"
+#include "base/memory/scoped_ptr.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 {
+
+// static
+scoped_ptr<BlimpCompositorAndroid> BlimpCompositorAndroid::Create(
+    const gfx::Size& real_size,
+    const gfx::Size& size,
+    float dp_to_px) {
+  gfx::Size device_size(real_size);
+  bool real_size_supported = true;
+  if (device_size.IsEmpty()) {
+    real_size_supported = false;
+    device_size = size;
+  }
+  return make_scoped_ptr(
+      new BlimpCompositorAndroid(device_size, real_size_supported, dp_to_px));
+}
+
+BlimpCompositorAndroid::BlimpCompositorAndroid(const gfx::Size& size,
+                                               bool real_size_supported,
+                                               float dp_to_px)
+    : BlimpCompositor(dp_to_px),
+      portrait_width_(std::min(size.width(), size.height())),
+      landscape_width_(std::max(size.width(), size.height())),
+      real_size_supported_(real_size_supported),
+      window_(nullptr) {}
+
+BlimpCompositorAndroid::~BlimpCompositorAndroid() {
+  SetSurface(nullptr, 0 /* null surface */);
+}
+
+void BlimpCompositorAndroid::SetSurface(JNIEnv* env, jobject jsurface) {
+  if (window_) {
+    SetVisible(false);
+    ANativeWindow_release(window_);
+    window_ = nullptr;
+  }
+
+  if (!jsurface)
+    return;
+
+  base::android::ScopedJavaLocalFrame scoped_local_reference_frame(env);
+  window_ = ANativeWindow_fromSurface(env, jsurface);
+  SetVisible(true);
+}
+
+gfx::AcceleratedWidget BlimpCompositorAndroid::GetWindow() {
+  return window_;
+}
+
+void BlimpCompositorAndroid::GenerateLayerTreeSettings(
+    cc::LayerTreeSettings* settings) {
+  BlimpCompositor::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 blimp