ui/compositor/layer.h

   1 // Copyright (c) 2012 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 #ifndef UI_COMPOSITOR_LAYER_H_
   6 #define UI_COMPOSITOR_LAYER_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "cc/animation/animation_events.h"
  16 #include "cc/animation/layer_animation_event_observer.h"
  17 #include "cc/base/region.h"
  18 #include "cc/base/scoped_ptr_vector.h"
  19 #include "cc/layers/content_layer_client.h"
  20 #include "cc/layers/layer_client.h"
  21 #include "cc/layers/surface_layer.h"
  22 #include "cc/layers/texture_layer_client.h"
  23 #include "cc/resources/texture_mailbox.h"
  24 #include "cc/surfaces/surface_id.h"
  25 #include "third_party/skia/include/core/SkColor.h"
  26 #include "third_party/skia/include/core/SkRegion.h"
  27 #include "ui/compositor/compositor.h"
  28 #include "ui/compositor/layer_animation_delegate.h"
  29 #include "ui/compositor/layer_delegate.h"
  30 #include "ui/compositor/layer_type.h"
  31 #include "ui/gfx/geometry/rect.h"
  32 #include "ui/gfx/image/image_skia.h"
  33 #include "ui/gfx/transform.h"
  34
  35 class SkCanvas;
  36
  37 namespace cc {
  38 class ContentLayer;
  39 class CopyOutputRequest;
  40 class DelegatedFrameProvider;
  41 class DelegatedRendererLayer;
  42 class Layer;
  43 class NinePatchLayer;
  44 class ResourceUpdateQueue;
  45 class SolidColorLayer;
  46 class SurfaceLayer;
  47 class TextureLayer;
  48 struct ReturnedResource;
  49 typedef std::vector<ReturnedResource> ReturnedResourceArray;
  50 }
  51
  52 namespace ui {
  53
  54 class Compositor;
  55 class LayerAnimator;
  56 class LayerOwner;
  57
  58 // Layer manages a texture, transform and a set of child Layers. Any View that
  59 // has enabled layers ends up creating a Layer to manage the texture.
  60 // A Layer can also be created without a texture, in which case it renders
  61 // nothing and is simply used as a node in a hierarchy of layers.
  62 // Coordinate system used in layers is DIP (Density Independent Pixel)
  63 // coordinates unless explicitly mentioned as pixel coordinates.
  64 //
  65 // NOTE: Unlike Views, each Layer does *not* own its child Layers. If you
  66 // delete a Layer and it has children, the parent of each child Layer is set to
  67 // NULL, but the children are not deleted.
  68 class COMPOSITOR_EXPORT Layer
  69     : public LayerAnimationDelegate,
  70       NON_EXPORTED_BASE(public cc::ContentLayerClient),
  71       NON_EXPORTED_BASE(public cc::TextureLayerClient),
  72       NON_EXPORTED_BASE(public cc::LayerClient),
  73       NON_EXPORTED_BASE(public cc::LayerAnimationEventObserver) {
  74  public:
  75   Layer();
  76   explicit Layer(LayerType type);
  77   ~Layer() override;
  78
  79   static bool UsingPictureLayer();
  80
  81   // Retrieves the Layer's compositor. The Layer will walk up its parent chain
  82   // to locate it. Returns NULL if the Layer is not attached to a compositor.
  83   Compositor* GetCompositor() {
  84     return const_cast<Compositor*>(
  85         const_cast<const Layer*>(this)->GetCompositor());
  86   }
  87   const Compositor* GetCompositor() const;
  88
  89   // Called by the compositor when the Layer is set as its root Layer. This can
  90   // only ever be called on the root layer.
  91   void SetCompositor(Compositor* compositor);
  92
  93   LayerDelegate* delegate() { return delegate_; }
  94   void set_delegate(LayerDelegate* delegate) { delegate_ = delegate; }
  95
  96   LayerOwner* owner() { return owner_; }
  97
  98   // Adds a new Layer to this Layer.
  99   void Add(Layer* child);
 100
 101   // Removes a Layer from this Layer.
 102   void Remove(Layer* child);
 103
 104   // Stacks |child| above all other children.
 105   void StackAtTop(Layer* child);
 106
 107   // Stacks |child| directly above |other|.  Both must be children of this
 108   // layer.  Note that if |child| is initially stacked even higher, calling this
 109   // method will result in |child| being lowered in the stacking order.
 110   void StackAbove(Layer* child, Layer* other);
 111
 112   // Stacks |child| below all other children.
 113   void StackAtBottom(Layer* child);
 114
 115   // Stacks |child| directly below |other|.  Both must be children of this
 116   // layer.
 117   void StackBelow(Layer* child, Layer* other);
 118
 119   // Returns the child Layers.
 120   const std::vector<Layer*>& children() const { return children_; }
 121
 122   // The parent.
 123   const Layer* parent() const { return parent_; }
 124   Layer* parent() { return parent_; }
 125
 126   LayerType type() const { return type_; }
 127
 128   // Returns true if this Layer contains |other| somewhere in its children.
 129   bool Contains(const Layer* other) const;
 130
 131   // The layer's animator is responsible for causing automatic animations when
 132   // properties are set. It also manages a queue of pending animations and
 133   // handles blending of animations. The layer takes ownership of the animator.
 134   void SetAnimator(LayerAnimator* animator);
 135
 136   // Returns the layer's animator. Creates a default animator of one has not
 137   // been set. Will not return NULL.
 138   LayerAnimator* GetAnimator();
 139
 140   // The transform, relative to the parent.
 141   void SetTransform(const gfx::Transform& transform);
 142   gfx::Transform transform() const;
 143
 144   // Return the target transform if animator is running, or the current
 145   // transform otherwise.
 146   gfx::Transform GetTargetTransform() const;
 147
 148   // The bounds, relative to the parent.
 149   void SetBounds(const gfx::Rect& bounds);
 150   const gfx::Rect& bounds() const { return bounds_; }
 151
 152   // The offset from our parent (stored in bounds.origin()) is an integer but we
 153   // may need to be at a fractional pixel offset to align properly on screen.
 154   void SetSubpixelPositionOffset(const gfx::Vector2dF offset);
 155   const gfx::Vector2dF& subpixel_position_offset() const {
 156     return subpixel_position_offset_;
 157   }
 158
 159   // Return the target bounds if animator is running, or the current bounds
 160   // otherwise.
 161   gfx::Rect GetTargetBounds() const;
 162
 163   // Sets/gets whether or not drawing of child layers should be clipped to the
 164   // bounds of this layer.
 165   void SetMasksToBounds(bool masks_to_bounds);
 166   bool GetMasksToBounds() const;
 167
 168   // The opacity of the layer. The opacity is applied to each pixel of the
 169   // texture (resulting alpha = opacity * alpha).
 170   float opacity() const;
 171   void SetOpacity(float opacity);
 172
 173   // Returns the actual opacity, which the opacity of this layer multipled by
 174   // the combined opacity of the parent.
 175   float GetCombinedOpacity() const;
 176
 177   // Blur pixels by this amount in anything below the layer and visible through
 178   // the layer.
 179   int background_blur() const { return background_blur_radius_; }
 180   void SetBackgroundBlur(int blur_radius);
 181
 182   // Saturate all pixels of this layer by this amount.
 183   // This effect will get "combined" with the inverted,
 184   // brightness and grayscale setting.
 185   float layer_saturation() const { return layer_saturation_; }
 186   void SetLayerSaturation(float saturation);
 187
 188   // Change the brightness of all pixels from this layer by this amount.
 189   // This effect will get "combined" with the inverted, saturate
 190   // and grayscale setting.
 191   float layer_brightness() const { return layer_brightness_; }
 192   void SetLayerBrightness(float brightness);
 193
 194   // Return the target brightness if animator is running, or the current
 195   // brightness otherwise.
 196   float GetTargetBrightness() const;
 197
 198   // Change the grayscale of all pixels from this layer by this amount.
 199   // This effect will get "combined" with the inverted, saturate
 200   // and brightness setting.
 201   float layer_grayscale() const { return layer_grayscale_; }
 202   void SetLayerGrayscale(float grayscale);
 203
 204   // Return the target grayscale if animator is running, or the current
 205   // grayscale otherwise.
 206   float GetTargetGrayscale() const;
 207
 208   // Zoom the background by a factor of |zoom|. The effect is blended along the
 209   // edge across |inset| pixels.
 210   void SetBackgroundZoom(float zoom, int inset);
 211
 212   // Set the shape of this layer.
 213   SkRegion* alpha_shape() const { return alpha_shape_.get(); }
 214   void SetAlphaShape(scoped_ptr<SkRegion> region);
 215
 216   // Invert the layer.
 217   bool layer_inverted() const { return layer_inverted_; }
 218   void SetLayerInverted(bool inverted);
 219
 220   // Return the target opacity if animator is running, or the current opacity
 221   // otherwise.
 222   float GetTargetOpacity() const;
 223
 224   // Set a layer mask for a layer.
 225   // Note the provided layer mask can neither have a layer mask itself nor can
 226   // it have any children. The ownership of |layer_mask| will not be
 227   // transferred with this call.
 228   // Furthermore: A mask layer can only be set to one layer.
 229   void SetMaskLayer(Layer* layer_mask);
 230   Layer* layer_mask_layer() { return layer_mask_; }
 231
 232   // Sets the visibility of the Layer. A Layer may be visible but not
 233   // drawn. This happens if any ancestor of a Layer is not visible.
 234   void SetVisible(bool visible);
 235   bool visible() const { return visible_; }
 236
 237   // Returns the target visibility if the animator is running. Otherwise, it
 238   // returns the current visibility.
 239   bool GetTargetVisibility() const;
 240
 241   // Returns true if this Layer is drawn. A Layer is drawn only if all ancestors
 242   // are visible.
 243   bool IsDrawn() const;
 244
 245   // Returns true if this layer can have a texture (has_texture_ is true)
 246   // and is not completely obscured by a child.
 247   bool ShouldDraw() const;
 248
 249   // Converts a point from the coordinates of |source| to the coordinates of
 250   // |target|. Necessarily, |source| and |target| must inhabit the same Layer
 251   // tree.
 252   static void ConvertPointToLayer(const Layer* source,
 253                                   const Layer* target,
 254                                   gfx::Point* point);
 255
 256   // Converts a transform to be relative to the given |ancestor|. Returns
 257   // whether success (that is, whether the given ancestor was really an
 258   // ancestor of this layer).
 259   bool GetTargetTransformRelativeTo(const Layer* ancestor,
 260                                     gfx::Transform* transform) const;
 261
 262   // See description in View for details
 263   void SetFillsBoundsOpaquely(bool fills_bounds_opaquely);
 264   bool fills_bounds_opaquely() const { return fills_bounds_opaquely_; }
 265
 266   // Set to true if this layer always paints completely within its bounds. If so
 267   // we can omit an unnecessary clear, even if the layer is transparent.
 268   void SetFillsBoundsCompletely(bool fills_bounds_completely);
 269
 270   const std::string& name() const { return name_; }
 271   void set_name(const std::string& name) { name_ = name; }
 272
 273   // Set new TextureMailbox for this layer. Note that |mailbox| may hold a
 274   // shared memory resource or an actual mailbox for a texture.
 275   void SetTextureMailbox(const cc::TextureMailbox& mailbox,
 276                          scoped_ptr<cc::SingleReleaseCallback> release_callback,
 277                          gfx::Size texture_size_in_dip);
 278   void SetTextureSize(gfx::Size texture_size_in_dip);
 279   void SetTextureFlipped(bool flipped);
 280   bool TextureFlipped() const;
 281
 282   // Begins showing delegated frames from the |frame_provider|.
 283   void SetShowDelegatedContent(cc::DelegatedFrameProvider* frame_provider,
 284                                gfx::Size frame_size_in_dip);
 285
 286   // Begins showing content from a surface with a particular id.
 287   void SetShowSurface(cc::SurfaceId surface_id,
 288                       const cc::SurfaceLayer::SatisfyCallback& satisfy_callback,
 289                       const cc::SurfaceLayer::RequireCallback& require_callback,
 290                       gfx::Size surface_size,
 291                       float scale,
 292                       gfx::Size frame_size_in_dip);
 293
 294   bool has_external_content() {
 295     return texture_layer_.get() || delegated_renderer_layer_.get() ||
 296            surface_layer_.get();
 297   }
 298
 299   // Show a solid color instead of delegated or surface contents.
 300   void SetShowSolidColorContent();
 301
 302   // Sets the layer's fill color.  May only be called for LAYER_SOLID_COLOR.
 303   void SetColor(SkColor color);
 304
 305   // Updates the nine patch layer's image, aperture and border. May only be
 306   // called for LAYER_NINE_PATCH.
 307   void UpdateNinePatchLayerImage(const gfx::ImageSkia& image);
 308   void UpdateNinePatchLayerAperture(const gfx::Rect& aperture_in_dip);
 309   void UpdateNinePatchLayerBorder(const gfx::Rect& border);
 310
 311   // Adds |invalid_rect| to the Layer's pending invalid rect and calls
 312   // ScheduleDraw(). Returns false if the paint request is ignored.
 313   bool SchedulePaint(const gfx::Rect& invalid_rect);
 314
 315   // Schedules a redraw of the layer tree at the compositor.
 316   // Note that this _does not_ invalidate any region of this layer; use
 317   // SchedulePaint() for that.
 318   void ScheduleDraw();
 319
 320   // Uses damaged rectangles recorded in |damaged_region_| to invalidate the
 321   // |cc_layer_|.
 322   void SendDamagedRects();
 323   void ClearDamagedRects();
 324
 325   const cc::Region& damaged_region() const { return damaged_region_; }
 326
 327   void CompleteAllAnimations();
 328
 329   // Suppresses painting the content by disconnecting |delegate_|.
 330   void SuppressPaint();
 331
 332   // Notifies the layer that the device scale factor has changed.
 333   void OnDeviceScaleFactorChanged(float device_scale_factor);
 334
 335   // Notifies the layer that one of its children has received a new
 336   // delegated frame.
 337   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip);
 338
 339   // Requets a copy of the layer's output as a texture or bitmap.
 340   void RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request);
 341
 342   // ContentLayerClient
 343   void PaintContents(
 344       SkCanvas* canvas,
 345       const gfx::Rect& clip,
 346       ContentLayerClient::PaintingControlSetting painting_control) override;
 347   void PaintContentsToDisplayList(
 348       cc::DisplayItemList* display_list,
 349       const gfx::Rect& clip,
 350       ContentLayerClient::PaintingControlSetting painting_control) override;
 351   bool FillsBoundsCompletely() const override;
 352
 353   cc::Layer* cc_layer() { return cc_layer_; }
 354
 355   // TextureLayerClient
 356   bool PrepareTextureMailbox(
 357       cc::TextureMailbox* mailbox,
 358       scoped_ptr<cc::SingleReleaseCallback>* release_callback,
 359       bool use_shared_memory) override;
 360
 361   float device_scale_factor() const { return device_scale_factor_; }
 362
 363   // Forces a render surface to be used on this layer. This has no positive
 364   // impact, and is only used for benchmarking/testing purpose.
 365   void SetForceRenderSurface(bool force);
 366   bool force_render_surface() const { return force_render_surface_; }
 367
 368   // LayerClient
 369   scoped_refptr<base::trace_event::ConvertableToTraceFormat> TakeDebugInfo()
 370       override;
 371
 372   // LayerAnimationEventObserver
 373   void OnAnimationStarted(const cc::AnimationEvent& event) override;
 374
 375   // Whether this layer has animations waiting to get sent to its cc::Layer.
 376   bool HasPendingThreadedAnimations() {
 377     return pending_threaded_animations_.size() != 0;
 378   }
 379
 380   // Triggers a call to SwitchToLayer.
 381   void SwitchCCLayerForTest();
 382
 383  private:
 384   friend class LayerOwner;
 385
 386   void CollectAnimators(std::vector<scoped_refptr<LayerAnimator> >* animators);
 387
 388   // Stacks |child| above or below |other|.  Helper method for StackAbove() and
 389   // StackBelow().
 390   void StackRelativeTo(Layer* child, Layer* other, bool above);
 391
 392   bool ConvertPointForAncestor(const Layer* ancestor, gfx::Point* point) const;
 393   bool ConvertPointFromAncestor(const Layer* ancestor, gfx::Point* point) const;
 394
 395   // Implementation of LayerAnimatorDelegate
 396   void SetBoundsFromAnimation(const gfx::Rect& bounds) override;
 397   void SetTransformFromAnimation(const gfx::Transform& transform) override;
 398   void SetOpacityFromAnimation(float opacity) override;
 399   void SetVisibilityFromAnimation(bool visibility) override;
 400   void SetBrightnessFromAnimation(float brightness) override;
 401   void SetGrayscaleFromAnimation(float grayscale) override;
 402   void SetColorFromAnimation(SkColor color) override;
 403   void ScheduleDrawForAnimation() override;
 404   const gfx::Rect& GetBoundsForAnimation() const override;
 405   gfx::Transform GetTransformForAnimation() const override;
 406   float GetOpacityForAnimation() const override;
 407   bool GetVisibilityForAnimation() const override;
 408   float GetBrightnessForAnimation() const override;
 409   float GetGrayscaleForAnimation() const override;
 410   SkColor GetColorForAnimation() const override;
 411   float GetDeviceScaleFactor() const override;
 412   void AddThreadedAnimation(scoped_ptr<cc::Animation> animation) override;
 413   void RemoveThreadedAnimation(int animation_id) override;
 414   LayerAnimatorCollection* GetLayerAnimatorCollection() override;
 415
 416   // Creates a corresponding composited layer for |type_|.
 417   void CreateCcLayer();
 418
 419   // Recomputes and sets to |cc_layer_|.
 420   void RecomputeDrawsContentAndUVRect();
 421   void RecomputePosition();
 422
 423   // Set all filters which got applied to the layer.
 424   void SetLayerFilters();
 425
 426   // Set all filters which got applied to the layer background.
 427   void SetLayerBackgroundFilters();
 428
 429   // Cleanup |cc_layer_| and replaces it with |new_layer|.
 430   void SwitchToLayer(scoped_refptr<cc::Layer> new_layer);
 431
 432   // We cannot send animations to our cc_layer_ until we have been added to a
 433   // layer tree. Instead, we hold on to these animations in
 434   // pending_threaded_animations_, and expect SendPendingThreadedAnimations to
 435   // be called once we have been added to a tree.
 436   void SendPendingThreadedAnimations();
 437
 438   void AddAnimatorsInTreeToCollection(LayerAnimatorCollection* collection);
 439   void RemoveAnimatorsInTreeFromCollection(LayerAnimatorCollection* collection);
 440
 441   // Returns whether the layer has an animating LayerAnimator.
 442   bool IsAnimating() const;
 443
 444   const LayerType type_;
 445
 446   Compositor* compositor_;
 447
 448   Layer* parent_;
 449
 450   // This layer's children, in bottom-to-top stacking order.
 451   std::vector<Layer*> children_;
 452
 453   gfx::Rect bounds_;
 454   gfx::Vector2dF subpixel_position_offset_;
 455
 456   // Visibility of this layer. See SetVisible/IsDrawn for more details.
 457   bool visible_;
 458
 459   bool force_render_surface_;
 460
 461   bool fills_bounds_opaquely_;
 462   bool fills_bounds_completely_;
 463
 464   // Union of damaged rects, in layer space, to be used when compositor is ready
 465   // to paint the content.
 466   cc::Region damaged_region_;
 467
 468   int background_blur_radius_;
 469
 470   // Several variables which will change the visible representation of
 471   // the layer.
 472   float layer_saturation_;
 473   float layer_brightness_;
 474   float layer_grayscale_;
 475   bool layer_inverted_;
 476
 477   // The associated mask layer with this layer.
 478   Layer* layer_mask_;
 479   // The back link from the mask layer to it's associated masked layer.
 480   // We keep this reference for the case that if the mask layer gets deleted
 481   // while attached to the main layer before the main layer is deleted.
 482   Layer* layer_mask_back_link_;
 483
 484   // The zoom factor to scale the layer by.  Zooming is disabled when this is
 485   // set to 1.
 486   float zoom_;
 487
 488   // Width of the border in pixels, where the scaling is blended.
 489   int zoom_inset_;
 490
 491   // Shape of the window.
 492   scoped_ptr<SkRegion> alpha_shape_;
 493
 494   std::string name_;
 495
 496   LayerDelegate* delegate_;
 497
 498   LayerOwner* owner_;
 499
 500   scoped_refptr<LayerAnimator> animator_;
 501
 502   // Animations that are passed to AddThreadedAnimation before this layer is
 503   // added to a tree.
 504   cc::ScopedPtrVector<cc::Animation> pending_threaded_animations_;
 505
 506   // Ownership of the layer is held through one of the strongly typed layer
 507   // pointers, depending on which sort of layer this is.
 508   scoped_refptr<cc::Layer> content_layer_;
 509   scoped_refptr<cc::NinePatchLayer> nine_patch_layer_;
 510   scoped_refptr<cc::TextureLayer> texture_layer_;
 511   scoped_refptr<cc::SolidColorLayer> solid_color_layer_;
 512   scoped_refptr<cc::DelegatedRendererLayer> delegated_renderer_layer_;
 513   scoped_refptr<cc::SurfaceLayer> surface_layer_;
 514   cc::Layer* cc_layer_;
 515
 516   // A cached copy of |Compositor::device_scale_factor()|.
 517   float device_scale_factor_;
 518
 519   // A cached copy of the nine patch layer's image and aperture.
 520   // These are required for device scale factor change.
 521   gfx::ImageSkia nine_patch_layer_image_;
 522   gfx::Rect nine_patch_layer_aperture_;
 523
 524   // The mailbox used by texture_layer_.
 525   cc::TextureMailbox mailbox_;
 526
 527   // The callback to release the mailbox. This is only set after
 528   // SetTextureMailbox is called, before we give it to the TextureLayer.
 529   scoped_ptr<cc::SingleReleaseCallback> mailbox_release_callback_;
 530
 531   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
 532   // or SetTextureMailbox was called.
 533   gfx::Size frame_size_in_dip_;
 534
 535   DISALLOW_COPY_AND_ASSIGN(Layer);
 536 };
 537
 538 }  // namespace ui
 539
 540 #endif  // UI_COMPOSITOR_LAYER_H_