chrome/browser/android/compositor/scene_layer/static_tab_scene_layer.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 "chrome/browser/android/compositor/scene_layer/static_tab_scene_layer.h"

#include "cc/layers/layer.h"
#include "chrome/browser/android/compositor/layer/content_layer.h"
#include "chrome/browser/android/compositor/layer_title_cache.h"
#include "chrome/browser/android/compositor/tab_content_manager.h"
#include "content/public/browser/android/compositor.h"
#include "jni/StaticTabSceneLayer_jni.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/android/resources/resource_manager_impl.h"

using base::android::JavaParamRef;
using base::android::JavaRef;

namespace android {

StaticTabSceneLayer::StaticTabSceneLayer(JNIEnv* env,
                                         const JavaRef<jobject>& jobj)
    : SceneLayer(env, jobj),
      last_set_tab_id_(-1),
      background_color_(SK_ColorWHITE),
      brightness_(1.f) {}

StaticTabSceneLayer::~StaticTabSceneLayer() {
}

bool StaticTabSceneLayer::ShouldShowBackground() {
  scoped_refptr<cc::Layer> root = layer_->RootLayer();
  return root && root->bounds() != layer_->bounds();
}

SkColor StaticTabSceneLayer::GetBackgroundColor() {
  return background_color_;
}

void StaticTabSceneLayer::UpdateTabLayer(
    JNIEnv* env,
    const JavaParamRef<jobject>& jobj,
    const JavaParamRef<jobject>& jtab_content_manager,
    jint id,
    jboolean can_use_live_layer,
    jint default_background_color,
    jfloat x,
    jfloat y,
    jfloat static_to_view_blend,
    jfloat saturation,
    jfloat brightness) {
  background_color_ = default_background_color;
  if (!content_layer_.get()) {
    android::TabContentManager* tab_content_manager =
        android::TabContentManager::FromJavaObject(jtab_content_manager);
    content_layer_ = android::ContentLayer::Create(tab_content_manager);
    layer_->AddChild(content_layer_->layer());
  }

  // Only override the alpha of content layers when the static tab is first
  // assigned to the layer tree.
  float content_alpha_override = 1.f;
  bool should_override_content_alpha = last_set_tab_id_ != id;
  last_set_tab_id_ = id;

  content_layer_->SetProperties(
      id, can_use_live_layer, static_to_view_blend,
      should_override_content_alpha, content_alpha_override, saturation,
      false, gfx::Rect());

  content_layer_->layer()->SetPosition(gfx::PointF(x, y));
  content_layer_->layer()->SetIsDrawable(true);

  // Only applies the brightness filter if the value has changed and is less
  // than 1.
  if (brightness != brightness_) {
    brightness_ = brightness;
    cc::FilterOperations filters;
    if (brightness_ < 1.f)
      filters.Append(cc::FilterOperation::CreateBrightnessFilter(brightness_));
    layer_->SetFilters(filters);
  }
}

static jlong JNI_StaticTabSceneLayer_Init(JNIEnv* env,
                                          const JavaParamRef<jobject>& jobj) {
  // This will automatically bind to the Java object and pass ownership there.
  StaticTabSceneLayer* scene_layer = new StaticTabSceneLayer(env, jobj);
  return reinterpret_cast<intptr_t>(scene_layer);
}

}  // namespace android