cc/layers/texture_layer.cc

   1 // Copyright 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/layers/texture_layer.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback_helpers.h"
   9 #include "base/location.h"
  10 #include "base/synchronization/lock.h"
  11 #include "cc/layers/texture_layer_client.h"
  12 #include "cc/layers/texture_layer_impl.h"
  13 #include "cc/resources/single_release_callback.h"
  14 #include "cc/trees/blocking_task_runner.h"
  15 #include "cc/trees/layer_tree_host.h"
  16
  17 namespace cc {
  18
  19 scoped_refptr<TextureLayer> TextureLayer::Create(TextureLayerClient* client) {
  20   return scoped_refptr<TextureLayer>(new TextureLayer(client, false));
  21 }
  22
  23 scoped_refptr<TextureLayer> TextureLayer::CreateForMailbox(
  24     TextureLayerClient* client) {
  25   return scoped_refptr<TextureLayer>(new TextureLayer(client, true));
  26 }
  27
  28 TextureLayer::TextureLayer(TextureLayerClient* client, bool uses_mailbox)
  29     : Layer(),
  30       client_(client),
  31       uses_mailbox_(uses_mailbox),
  32       flipped_(true),
  33       uv_top_left_(0.f, 0.f),
  34       uv_bottom_right_(1.f, 1.f),
  35       premultiplied_alpha_(true),
  36       blend_background_color_(false),
  37       rate_limit_context_(false),
  38       content_committed_(false),
  39       texture_id_(0),
  40       needs_set_mailbox_(false) {
  41   vertex_opacity_[0] = 1.0f;
  42   vertex_opacity_[1] = 1.0f;
  43   vertex_opacity_[2] = 1.0f;
  44   vertex_opacity_[3] = 1.0f;
  45 }
  46
  47 TextureLayer::~TextureLayer() {
  48 }
  49
  50 void TextureLayer::ClearClient() {
  51   if (rate_limit_context_ && client_ && layer_tree_host())
  52     layer_tree_host()->StopRateLimiter();
  53   client_ = NULL;
  54   if (uses_mailbox_)
  55     SetTextureMailbox(TextureMailbox(), scoped_ptr<SingleReleaseCallback>());
  56   else
  57     SetTextureId(0);
  58 }
  59
  60 scoped_ptr<LayerImpl> TextureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  61   return TextureLayerImpl::Create(tree_impl, id(), uses_mailbox_).
  62       PassAs<LayerImpl>();
  63 }
  64
  65 void TextureLayer::SetFlipped(bool flipped) {
  66   if (flipped_ == flipped)
  67     return;
  68   flipped_ = flipped;
  69   SetNeedsCommit();
  70 }
  71
  72 void TextureLayer::SetUV(gfx::PointF top_left, gfx::PointF bottom_right) {
  73   if (uv_top_left_ == top_left && uv_bottom_right_ == bottom_right)
  74     return;
  75   uv_top_left_ = top_left;
  76   uv_bottom_right_ = bottom_right;
  77   SetNeedsCommit();
  78 }
  79
  80 void TextureLayer::SetVertexOpacity(float bottom_left,
  81                                     float top_left,
  82                                     float top_right,
  83                                     float bottom_right) {
  84   // Indexing according to the quad vertex generation:
  85   // 1--2
  86   // |  |
  87   // 0--3
  88   if (vertex_opacity_[0] == bottom_left &&
  89       vertex_opacity_[1] == top_left &&
  90       vertex_opacity_[2] == top_right &&
  91       vertex_opacity_[3] == bottom_right)
  92     return;
  93   vertex_opacity_[0] = bottom_left;
  94   vertex_opacity_[1] = top_left;
  95   vertex_opacity_[2] = top_right;
  96   vertex_opacity_[3] = bottom_right;
  97   SetNeedsCommit();
  98 }
  99
 100 void TextureLayer::SetPremultipliedAlpha(bool premultiplied_alpha) {
 101   if (premultiplied_alpha_ == premultiplied_alpha)
 102     return;
 103   premultiplied_alpha_ = premultiplied_alpha;
 104   SetNeedsCommit();
 105 }
 106
 107 void TextureLayer::SetBlendBackgroundColor(bool blend) {
 108   if (blend_background_color_ == blend)
 109     return;
 110   blend_background_color_ = blend;
 111   SetNeedsCommit();
 112 }
 113
 114 void TextureLayer::SetRateLimitContext(bool rate_limit) {
 115   if (!rate_limit && rate_limit_context_ && client_ && layer_tree_host())
 116     layer_tree_host()->StopRateLimiter();
 117
 118   rate_limit_context_ = rate_limit;
 119 }
 120
 121 void TextureLayer::SetTextureId(unsigned id) {
 122   DCHECK(!uses_mailbox_);
 123   if (texture_id_ == id)
 124     return;
 125   if (texture_id_ && layer_tree_host())
 126     layer_tree_host()->AcquireLayerTextures();
 127   texture_id_ = id;
 128   SetNeedsCommit();
 129   // The texture id needs to be removed from the active tree before the
 130   // commit is called complete.
 131   SetNextCommitWaitsForActivation();
 132 }
 133
 134 void TextureLayer::SetTextureMailboxInternal(
 135     const TextureMailbox& mailbox,
 136     scoped_ptr<SingleReleaseCallback> release_callback,
 137     bool requires_commit) {
 138   DCHECK(uses_mailbox_);
 139   DCHECK(!mailbox.IsValid() || !holder_ref_ ||
 140          !mailbox.Equals(holder_ref_->holder()->mailbox()));
 141   DCHECK_EQ(mailbox.IsValid(), !!release_callback);
 142
 143   // If we never commited the mailbox, we need to release it here.
 144   if (mailbox.IsValid())
 145     holder_ref_ = MailboxHolder::Create(mailbox, release_callback.Pass());
 146   else
 147     holder_ref_.reset();
 148   needs_set_mailbox_ = true;
 149   // If we are within a commit, no need to do it again immediately after.
 150   if (requires_commit)
 151     SetNeedsCommit();
 152   else
 153     SetNeedsPushProperties();
 154
 155   // The active frame needs to be replaced and the mailbox returned before the
 156   // commit is called complete.
 157   SetNextCommitWaitsForActivation();
 158 }
 159
 160 void TextureLayer::SetTextureMailbox(
 161     const TextureMailbox& mailbox,
 162     scoped_ptr<SingleReleaseCallback> release_callback) {
 163   SetTextureMailboxInternal(
 164       mailbox,
 165       release_callback.Pass(),
 166       true /* requires_commit */);
 167 }
 168
 169 void TextureLayer::WillModifyTexture() {
 170   if (!uses_mailbox_ && layer_tree_host() && (DrawsContent() ||
 171       content_committed_)) {
 172     layer_tree_host()->AcquireLayerTextures();
 173     content_committed_ = false;
 174   }
 175 }
 176
 177 void TextureLayer::SetNeedsDisplayRect(const gfx::RectF& dirty_rect) {
 178   Layer::SetNeedsDisplayRect(dirty_rect);
 179
 180   if (rate_limit_context_ && client_ && layer_tree_host() && DrawsContent())
 181     layer_tree_host()->StartRateLimiter();
 182 }
 183
 184 void TextureLayer::SetLayerTreeHost(LayerTreeHost* host) {
 185   if (layer_tree_host() == host) {
 186     Layer::SetLayerTreeHost(host);
 187     return;
 188   }
 189
 190   if (layer_tree_host()) {
 191     if (texture_id_) {
 192       layer_tree_host()->AcquireLayerTextures();
 193       // The texture id needs to be removed from the active tree before the
 194       // commit is called complete.
 195       SetNextCommitWaitsForActivation();
 196     }
 197     if (rate_limit_context_ && client_)
 198       layer_tree_host()->StopRateLimiter();
 199   }
 200   // If we're removed from the tree, the TextureLayerImpl will be destroyed, and
 201   // we will need to set the mailbox again on a new TextureLayerImpl the next
 202   // time we push.
 203   if (!host && uses_mailbox_ && holder_ref_) {
 204     needs_set_mailbox_ = true;
 205     // The active frame needs to be replaced and the mailbox returned before the
 206     // commit is called complete.
 207     SetNextCommitWaitsForActivation();
 208   }
 209   Layer::SetLayerTreeHost(host);
 210 }
 211
 212 bool TextureLayer::DrawsContent() const {
 213   return (client_ || texture_id_ || holder_ref_) && Layer::DrawsContent();
 214 }
 215
 216 bool TextureLayer::Update(ResourceUpdateQueue* queue,
 217                           const OcclusionTracker* occlusion) {
 218   bool updated = Layer::Update(queue, occlusion);
 219   if (client_) {
 220     if (uses_mailbox_) {
 221       TextureMailbox mailbox;
 222       scoped_ptr<SingleReleaseCallback> release_callback;
 223       if (client_->PrepareTextureMailbox(
 224               &mailbox,
 225               &release_callback,
 226               layer_tree_host()->UsingSharedMemoryResources())) {
 227         // Already within a commit, no need to do another one immediately.
 228         SetTextureMailboxInternal(
 229             mailbox,
 230             release_callback.Pass(),
 231             false /* requires_commit */);
 232         updated = true;
 233       }
 234     } else {
 235       texture_id_ = client_->PrepareTexture();
 236       updated = true;
 237       SetNeedsPushProperties();
 238       // The texture id needs to be removed from the active tree before the
 239       // commit is called complete.
 240       SetNextCommitWaitsForActivation();
 241     }
 242   }
 243
 244   // SetTextureMailbox could be called externally and the same mailbox used for
 245   // different textures.  Such callers notify this layer that the texture has
 246   // changed by calling SetNeedsDisplay, so check for that here.
 247   return updated || !update_rect_.IsEmpty();
 248 }
 249
 250 void TextureLayer::PushPropertiesTo(LayerImpl* layer) {
 251   Layer::PushPropertiesTo(layer);
 252
 253   TextureLayerImpl* texture_layer = static_cast<TextureLayerImpl*>(layer);
 254   texture_layer->set_flipped(flipped_);
 255   texture_layer->set_uv_top_left(uv_top_left_);
 256   texture_layer->set_uv_bottom_right(uv_bottom_right_);
 257   texture_layer->set_vertex_opacity(vertex_opacity_);
 258   texture_layer->set_premultiplied_alpha(premultiplied_alpha_);
 259   texture_layer->set_blend_background_color(blend_background_color_);
 260   if (uses_mailbox_ && needs_set_mailbox_) {
 261     TextureMailbox texture_mailbox;
 262     scoped_ptr<SingleReleaseCallback> release_callback;
 263     if (holder_ref_) {
 264       MailboxHolder* holder = holder_ref_->holder();
 265       texture_mailbox = holder->mailbox();
 266       release_callback = holder->GetCallbackForImplThread();
 267     }
 268     texture_layer->SetTextureMailbox(texture_mailbox, release_callback.Pass());
 269     needs_set_mailbox_ = false;
 270   } else {
 271     texture_layer->set_texture_id(texture_id_);
 272     content_committed_ = DrawsContent();
 273   }
 274 }
 275
 276 Region TextureLayer::VisibleContentOpaqueRegion() const {
 277   if (contents_opaque())
 278     return visible_content_rect();
 279
 280   if (blend_background_color_ && (SkColorGetA(background_color()) == 0xFF))
 281     return visible_content_rect();
 282
 283   return Region();
 284 }
 285
 286 TextureLayer::MailboxHolder::MainThreadReference::MainThreadReference(
 287     MailboxHolder* holder)
 288     : holder_(holder) {
 289   holder_->InternalAddRef();
 290 }
 291
 292 TextureLayer::MailboxHolder::MainThreadReference::~MainThreadReference() {
 293   holder_->InternalRelease();
 294 }
 295
 296 TextureLayer::MailboxHolder::MailboxHolder(
 297     const TextureMailbox& mailbox,
 298     scoped_ptr<SingleReleaseCallback> release_callback)
 299     : message_loop_(BlockingTaskRunner::current()),
 300       internal_references_(0),
 301       mailbox_(mailbox),
 302       release_callback_(release_callback.Pass()),
 303       sync_point_(mailbox.sync_point()),
 304       is_lost_(false) {
 305 }
 306
 307 TextureLayer::MailboxHolder::~MailboxHolder() {
 308   DCHECK_EQ(0u, internal_references_);
 309 }
 310
 311 scoped_ptr<TextureLayer::MailboxHolder::MainThreadReference>
 312 TextureLayer::MailboxHolder::Create(
 313     const TextureMailbox& mailbox,
 314     scoped_ptr<SingleReleaseCallback> release_callback) {
 315   return scoped_ptr<MainThreadReference>(new MainThreadReference(
 316       new MailboxHolder(mailbox, release_callback.Pass())));
 317 }
 318
 319 void TextureLayer::MailboxHolder::Return(unsigned sync_point, bool is_lost) {
 320   base::AutoLock lock(arguments_lock_);
 321   sync_point_ = sync_point;
 322   is_lost_ = is_lost;
 323 }
 324
 325 scoped_ptr<SingleReleaseCallback>
 326 TextureLayer::MailboxHolder::GetCallbackForImplThread() {
 327   // We can't call GetCallbackForImplThread if we released the main thread
 328   // reference.
 329   DCHECK_GT(internal_references_, 0u);
 330   InternalAddRef();
 331   return SingleReleaseCallback::Create(
 332       base::Bind(&MailboxHolder::ReturnAndReleaseOnImplThread, this));
 333 }
 334
 335 void TextureLayer::MailboxHolder::InternalAddRef() {
 336   ++internal_references_;
 337 }
 338
 339 void TextureLayer::MailboxHolder::InternalRelease() {
 340   DCHECK(message_loop_->BelongsToCurrentThread());
 341   if (!--internal_references_) {
 342     release_callback_->Run(sync_point_, is_lost_);
 343     mailbox_ = TextureMailbox();
 344     release_callback_.reset();
 345   }
 346 }
 347
 348 void TextureLayer::MailboxHolder::ReturnAndReleaseOnImplThread(
 349     unsigned sync_point, bool is_lost) {
 350   Return(sync_point, is_lost);
 351   message_loop_->PostTask(FROM_HERE,
 352                           base::Bind(&MailboxHolder::InternalRelease, this));
 353 }
 354
 355 }  // namespace cc