layer.cc revision 3551c9c881056c480085172ff9840cab31610854 
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#include "ui/compositor/layer.h"
6
7#include <algorithm>
8
9#include "base/command_line.h"
10#include "base/debug/trace_event.h"
11#include "base/logging.h"
12#include "base/memory/scoped_ptr.h"
13#include "cc/base/scoped_ptr_algorithm.h"
14#include "cc/layers/content_layer.h"
15#include "cc/layers/delegated_renderer_layer.h"
16#include "cc/layers/solid_color_layer.h"
17#include "cc/layers/texture_layer.h"
18#include "cc/output/copy_output_request.h"
19#include "cc/output/delegated_frame_data.h"
20#include "cc/output/filter_operation.h"
21#include "cc/output/filter_operations.h"
22#include "cc/resources/transferable_resource.h"
23#include "ui/base/animation/animation.h"
24#include "ui/compositor/compositor_switches.h"
25#include "ui/compositor/dip_util.h"
26#include "ui/compositor/layer_animator.h"
27#include "ui/gfx/canvas.h"
28#include "ui/gfx/display.h"
29#include "ui/gfx/interpolated_transform.h"
30#include "ui/gfx/point3_f.h"
31#include "ui/gfx/point_conversions.h"
32#include "ui/gfx/size_conversions.h"
33
34namespace {
35
36const ui::Layer* GetRoot(const ui::Layer* layer) {
37  while (layer->parent())
38    layer = layer->parent();
39  return layer;
40}
41
42}  // namespace
43
44namespace ui {
45
46Layer::Layer()
47    : type_(LAYER_TEXTURED),
48      compositor_(NULL),
49      parent_(NULL),
50      visible_(true),
51      force_render_surface_(false),
52      fills_bounds_opaquely_(true),
53      layer_updated_externally_(false),
54      background_blur_radius_(0),
55      layer_saturation_(0.0f),
56      layer_brightness_(0.0f),
57      layer_grayscale_(0.0f),
58      layer_inverted_(false),
59      layer_mask_(NULL),
60      layer_mask_back_link_(NULL),
61      zoom_(1),
62      zoom_inset_(0),
63      delegate_(NULL),
64      cc_layer_(NULL),
65      scale_content_(true),
66      device_scale_factor_(1.0f) {
67  CreateWebLayer();
68}
69
70Layer::Layer(LayerType type)
71    : type_(type),
72      compositor_(NULL),
73      parent_(NULL),
74      visible_(true),
75      force_render_surface_(false),
76      fills_bounds_opaquely_(true),
77      layer_updated_externally_(false),
78      background_blur_radius_(0),
79      layer_saturation_(0.0f),
80      layer_brightness_(0.0f),
81      layer_grayscale_(0.0f),
82      layer_inverted_(false),
83      layer_mask_(NULL),
84      layer_mask_back_link_(NULL),
85      zoom_(1),
86      zoom_inset_(0),
87      delegate_(NULL),
88      cc_layer_(NULL),
89      scale_content_(true),
90      device_scale_factor_(1.0f) {
91  CreateWebLayer();
92}
93
94Layer::~Layer() {
95  // Destroying the animator may cause observers to use the layer (and
96  // indirectly the WebLayer). Destroy the animator first so that the WebLayer
97  // is still around.
98  if (animator_.get())
99    animator_->SetDelegate(NULL);
100  animator_ = NULL;
101  if (compositor_)
102    compositor_->SetRootLayer(NULL);
103  if (parent_)
104    parent_->Remove(this);
105  if (layer_mask_)
106    SetMaskLayer(NULL);
107  if (layer_mask_back_link_)
108    layer_mask_back_link_->SetMaskLayer(NULL);
109  for (size_t i = 0; i < children_.size(); ++i)
110    children_[i]->parent_ = NULL;
111  cc_layer_->RemoveLayerAnimationEventObserver(this);
112  cc_layer_->RemoveFromParent();
113}
114
115Compositor* Layer::GetCompositor() {
116  return GetRoot(this)->compositor_;
117}
118
119float Layer::opacity() const {
120  return cc_layer_->opacity();
121}
122
123void Layer::SetCompositor(Compositor* compositor) {
124  // This function must only be called to set the compositor on the root layer,
125  // or to reset it.
126  DCHECK(!compositor || !compositor_);
127  DCHECK(!compositor || compositor->root_layer() == this);
128  DCHECK(!parent_);
129  compositor_ = compositor;
130  if (compositor) {
131    OnDeviceScaleFactorChanged(compositor->device_scale_factor());
132    SendPendingThreadedAnimations();
133  }
134}
135
136void Layer::Add(Layer* child) {
137  DCHECK(!child->compositor_);
138  if (child->parent_)
139    child->parent_->Remove(child);
140  child->parent_ = this;
141  children_.push_back(child);
142  cc_layer_->AddChild(child->cc_layer_);
143  child->OnDeviceScaleFactorChanged(device_scale_factor_);
144  if (GetCompositor())
145    child->SendPendingThreadedAnimations();
146}
147
148void Layer::Remove(Layer* child) {
149  std::vector<Layer*>::iterator i =
150      std::find(children_.begin(), children_.end(), child);
151  DCHECK(i != children_.end());
152  children_.erase(i);
153  child->parent_ = NULL;
154  child->cc_layer_->RemoveFromParent();
155}
156
157void Layer::StackAtTop(Layer* child) {
158  if (children_.size() <= 1 || child == children_.back())
159    return;  // Already in front.
160  StackAbove(child, children_.back());
161}
162
163void Layer::StackAbove(Layer* child, Layer* other) {
164  StackRelativeTo(child, other, true);
165}
166
167void Layer::StackAtBottom(Layer* child) {
168  if (children_.size() <= 1 || child == children_.front())
169    return;  // Already on bottom.
170  StackBelow(child, children_.front());
171}
172
173void Layer::StackBelow(Layer* child, Layer* other) {
174  StackRelativeTo(child, other, false);
175}
176
177bool Layer::Contains(const Layer* other) const {
178  for (const Layer* parent = other; parent; parent = parent->parent()) {
179    if (parent == this)
180      return true;
181  }
182  return false;
183}
184
185void Layer::SetAnimator(LayerAnimator* animator) {
186  if (animator)
187    animator->SetDelegate(this);
188  animator_ = animator;
189}
190
191LayerAnimator* Layer::GetAnimator() {
192  if (!animator_.get())
193    SetAnimator(LayerAnimator::CreateDefaultAnimator());
194  return animator_.get();
195}
196
197void Layer::SetTransform(const gfx::Transform& transform) {
198  GetAnimator()->SetTransform(transform);
199}
200
201gfx::Transform Layer::GetTargetTransform() const {
202  if (animator_.get() && animator_->IsAnimatingProperty(
203      LayerAnimationElement::TRANSFORM)) {
204    return animator_->GetTargetTransform();
205  }
206  return transform();
207}
208
209void Layer::SetBounds(const gfx::Rect& bounds) {
210  GetAnimator()->SetBounds(bounds);
211}
212
213gfx::Rect Layer::GetTargetBounds() const {
214  if (animator_.get() && animator_->IsAnimatingProperty(
215      LayerAnimationElement::BOUNDS)) {
216    return animator_->GetTargetBounds();
217  }
218  return bounds_;
219}
220
221void Layer::SetMasksToBounds(bool masks_to_bounds) {
222  cc_layer_->SetMasksToBounds(masks_to_bounds);
223}
224
225bool Layer::GetMasksToBounds() const {
226  return cc_layer_->masks_to_bounds();
227}
228
229void Layer::SetOpacity(float opacity) {
230  GetAnimator()->SetOpacity(opacity);
231}
232
233float Layer::GetCombinedOpacity() const {
234  float opacity = this->opacity();
235  Layer* current = this->parent_;
236  while (current) {
237    opacity *= current->opacity();
238    current = current->parent_;
239  }
240  return opacity;
241}
242
243void Layer::SetBackgroundBlur(int blur_radius) {
244  background_blur_radius_ = blur_radius;
245
246  SetLayerBackgroundFilters();
247}
248
249void Layer::SetLayerSaturation(float saturation) {
250  layer_saturation_ = saturation;
251  SetLayerFilters();
252}
253
254void Layer::SetLayerBrightness(float brightness) {
255  GetAnimator()->SetBrightness(brightness);
256}
257
258float Layer::GetTargetBrightness() const {
259  if (animator_.get() && animator_->IsAnimatingProperty(
260      LayerAnimationElement::BRIGHTNESS)) {
261    return animator_->GetTargetBrightness();
262  }
263  return layer_brightness();
264}
265
266void Layer::SetLayerGrayscale(float grayscale) {
267  GetAnimator()->SetGrayscale(grayscale);
268}
269
270float Layer::GetTargetGrayscale() const {
271  if (animator_.get() && animator_->IsAnimatingProperty(
272      LayerAnimationElement::GRAYSCALE)) {
273    return animator_->GetTargetGrayscale();
274  }
275  return layer_grayscale();
276}
277
278void Layer::SetLayerInverted(bool inverted) {
279  layer_inverted_ = inverted;
280  SetLayerFilters();
281}
282
283void Layer::SetMaskLayer(Layer* layer_mask) {
284  // The provided mask should not have a layer mask itself.
285  DCHECK(!layer_mask ||
286         (!layer_mask->layer_mask_layer() &&
287          layer_mask->children().empty() &&
288          !layer_mask->layer_mask_back_link_));
289  DCHECK(!layer_mask_back_link_);
290  if (layer_mask_ == layer_mask)
291    return;
292  // We need to de-reference the currently linked object so that no problem
293  // arises if the mask layer gets deleted before this object.
294  if (layer_mask_)
295    layer_mask_->layer_mask_back_link_ = NULL;
296  layer_mask_ = layer_mask;
297  cc_layer_->SetMaskLayer(
298      layer_mask ? layer_mask->cc_layer() : NULL);
299  // We need to reference the linked object so that it can properly break the
300  // link to us when it gets deleted.
301  if (layer_mask) {
302    layer_mask->layer_mask_back_link_ = this;
303    layer_mask->OnDeviceScaleFactorChanged(device_scale_factor_);
304  }
305}
306
307void Layer::SetBackgroundZoom(float zoom, int inset) {
308  zoom_ = zoom;
309  zoom_inset_ = inset;
310
311  SetLayerBackgroundFilters();
312}
313
314void Layer::SetLayerFilters() {
315  cc::FilterOperations filters;
316  if (layer_saturation_) {
317    filters.Append(cc::FilterOperation::CreateSaturateFilter(
318        layer_saturation_));
319  }
320  if (layer_grayscale_) {
321    filters.Append(cc::FilterOperation::CreateGrayscaleFilter(
322        layer_grayscale_));
323  }
324  if (layer_inverted_)
325    filters.Append(cc::FilterOperation::CreateInvertFilter(1.0));
326  // Brightness goes last, because the resulting colors neeed clamping, which
327  // cause further color matrix filters to be applied separately. In this order,
328  // they all can be combined in a single pass.
329  if (layer_brightness_) {
330    filters.Append(cc::FilterOperation::CreateSaturatingBrightnessFilter(
331        layer_brightness_));
332  }
333
334  cc_layer_->SetFilters(filters);
335}
336
337void Layer::SetLayerBackgroundFilters() {
338  cc::FilterOperations filters;
339  if (zoom_ != 1)
340    filters.Append(cc::FilterOperation::CreateZoomFilter(zoom_, zoom_inset_));
341
342  if (background_blur_radius_) {
343    filters.Append(cc::FilterOperation::CreateBlurFilter(
344        background_blur_radius_));
345  }
346
347  cc_layer_->SetBackgroundFilters(filters);
348}
349
350float Layer::GetTargetOpacity() const {
351  if (animator_.get() && animator_->IsAnimatingProperty(
352      LayerAnimationElement::OPACITY))
353    return animator_->GetTargetOpacity();
354  return opacity();
355}
356
357void Layer::SetVisible(bool visible) {
358  GetAnimator()->SetVisibility(visible);
359}
360
361bool Layer::GetTargetVisibility() const {
362  if (animator_.get() && animator_->IsAnimatingProperty(
363      LayerAnimationElement::VISIBILITY))
364    return animator_->GetTargetVisibility();
365  return visible_;
366}
367
368bool Layer::IsDrawn() const {
369  const Layer* layer = this;
370  while (layer && layer->visible_)
371    layer = layer->parent_;
372  return layer == NULL;
373}
374
375bool Layer::ShouldDraw() const {
376  return type_ != LAYER_NOT_DRAWN && GetCombinedOpacity() > 0.0f;
377}
378
379// static
380void Layer::ConvertPointToLayer(const Layer* source,
381                                const Layer* target,
382                                gfx::Point* point) {
383  if (source == target)
384    return;
385
386  const Layer* root_layer = GetRoot(source);
387  CHECK_EQ(root_layer, GetRoot(target));
388
389  if (source != root_layer)
390    source->ConvertPointForAncestor(root_layer, point);
391  if (target != root_layer)
392    target->ConvertPointFromAncestor(root_layer, point);
393}
394
395bool Layer::GetTargetTransformRelativeTo(const Layer* ancestor,
396                                         gfx::Transform* transform) const {
397  const Layer* p = this;
398  for (; p && p != ancestor; p = p->parent()) {
399    gfx::Transform translation;
400    translation.Translate(static_cast<float>(p->bounds().x()),
401                          static_cast<float>(p->bounds().y()));
402    // Use target transform so that result will be correct once animation is
403    // finished.
404    if (!p->GetTargetTransform().IsIdentity())
405      transform->ConcatTransform(p->GetTargetTransform());
406    transform->ConcatTransform(translation);
407  }
408  return p == ancestor;
409}
410
411// static
412gfx::Transform Layer::ConvertTransformToCCTransform(
413    const gfx::Transform& transform,
414    float device_scale_factor) {
415  gfx::Transform cc_transform;
416  cc_transform.Scale(device_scale_factor, device_scale_factor);
417  cc_transform.PreconcatTransform(transform);
418  cc_transform.Scale(1.0f / device_scale_factor, 1.0f / device_scale_factor);
419  return cc_transform;
420}
421
422void Layer::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
423  if (fills_bounds_opaquely_ == fills_bounds_opaquely)
424    return;
425
426  fills_bounds_opaquely_ = fills_bounds_opaquely;
427
428  cc_layer_->SetContentsOpaque(fills_bounds_opaquely);
429}
430
431void Layer::SwitchToLayer(scoped_refptr<cc::Layer> new_layer) {
432  // Finish animations being handled by cc_layer_.
433  if (animator_.get()) {
434    animator_->StopAnimatingProperty(LayerAnimationElement::TRANSFORM);
435    animator_->StopAnimatingProperty(LayerAnimationElement::OPACITY);
436  }
437
438  if (texture_layer_.get())
439    texture_layer_->WillModifyTexture();
440  // TODO(piman): delegated_renderer_layer_ cleanup.
441
442  cc_layer_->RemoveAllChildren();
443  if (parent_) {
444    DCHECK(parent_->cc_layer_);
445    parent_->cc_layer_->ReplaceChild(cc_layer_, new_layer);
446  }
447  cc_layer_->RemoveLayerAnimationEventObserver(this);
448  new_layer->SetOpacity(cc_layer_->opacity());
449  new_layer->SetTransform(cc_layer_->transform());
450  new_layer->SetPosition(cc_layer_->position());
451
452  cc_layer_ = new_layer.get();
453  content_layer_ = NULL;
454  solid_color_layer_ = NULL;
455  texture_layer_ = NULL;
456  delegated_renderer_layer_ = NULL;
457
458  cc_layer_->AddLayerAnimationEventObserver(this);
459  for (size_t i = 0; i < children_.size(); ++i) {
460    DCHECK(children_[i]->cc_layer_);
461    cc_layer_->AddChild(children_[i]->cc_layer_);
462  }
463  cc_layer_->SetAnchorPoint(gfx::PointF());
464  cc_layer_->SetContentsOpaque(fills_bounds_opaquely_);
465  cc_layer_->SetForceRenderSurface(force_render_surface_);
466  cc_layer_->SetIsDrawable(type_ != LAYER_NOT_DRAWN);
467  cc_layer_->SetHideLayerAndSubtree(!visible_);
468}
469
470void Layer::SwitchCCLayerForTest() {
471  scoped_refptr<cc::ContentLayer> new_layer = cc::ContentLayer::Create(this);
472  SwitchToLayer(new_layer);
473  content_layer_ = new_layer;
474}
475
476void Layer::SetExternalTexture(Texture* texture) {
477  // Hold a ref to the old |Texture| until we have updated all
478  // compositor references to the texture id that it holds.
479  scoped_refptr<ui::Texture> old_texture = texture_;
480
481  DCHECK_EQ(type_, LAYER_TEXTURED);
482  DCHECK(!solid_color_layer_.get());
483  bool has_texture = !!texture;
484  layer_updated_externally_ = has_texture;
485  texture_ = texture;
486  if (!!texture_layer_.get() != has_texture) {
487    // Switch to a different type of layer.
488    if (has_texture) {
489      scoped_refptr<cc::TextureLayer> new_layer =
490          cc::TextureLayer::Create(this);
491      new_layer->SetFlipped(texture_->flipped());
492      SwitchToLayer(new_layer);
493      texture_layer_ = new_layer;
494    } else {
495      scoped_refptr<cc::ContentLayer> new_layer =
496          cc::ContentLayer::Create(this);
497      SwitchToLayer(new_layer);
498      content_layer_ = new_layer;
499    }
500  }
501  RecomputeDrawsContentAndUVRect();
502}
503
504void Layer::SetTextureMailbox(const cc::TextureMailbox& mailbox,
505                              float scale_factor) {
506  DCHECK_EQ(type_, LAYER_TEXTURED);
507  DCHECK(!solid_color_layer_.get());
508  layer_updated_externally_ = true;
509  texture_ = NULL;
510  if (!texture_layer_.get() || !texture_layer_->uses_mailbox()) {
511    scoped_refptr<cc::TextureLayer> new_layer =
512        cc::TextureLayer::CreateForMailbox(this);
513    new_layer->SetFlipped(false);
514    SwitchToLayer(new_layer);
515    texture_layer_ = new_layer;
516  }
517  texture_layer_->SetTextureMailbox(mailbox);
518  mailbox_ = mailbox;
519  mailbox_scale_factor_ = scale_factor;
520  RecomputeDrawsContentAndUVRect();
521}
522
523cc::TextureMailbox Layer::GetTextureMailbox(float* scale_factor) {
524  if (scale_factor)
525    *scale_factor = mailbox_scale_factor_;
526  cc::TextureMailbox::ReleaseCallback callback;
527  return mailbox_.CopyWithNewCallback(callback);
528}
529
530void Layer::SetDelegatedFrame(scoped_ptr<cc::DelegatedFrameData> frame,
531                              gfx::Size frame_size_in_dip) {
532  DCHECK_EQ(type_, LAYER_TEXTURED);
533  bool has_frame = frame.get() && !frame->render_pass_list.empty();
534  layer_updated_externally_ = has_frame;
535  delegated_frame_size_in_dip_ = frame_size_in_dip;
536  if (!!delegated_renderer_layer_.get() != has_frame) {
537    if (has_frame) {
538      scoped_refptr<cc::DelegatedRendererLayer> new_layer =
539          cc::DelegatedRendererLayer::Create(NULL);
540      SwitchToLayer(new_layer);
541      delegated_renderer_layer_ = new_layer;
542    } else {
543      scoped_refptr<cc::ContentLayer> new_layer =
544          cc::ContentLayer::Create(this);
545      SwitchToLayer(new_layer);
546      content_layer_ = new_layer;
547    }
548  }
549  if (has_frame)
550    delegated_renderer_layer_->SetFrameData(frame.Pass());
551  RecomputeDrawsContentAndUVRect();
552}
553
554void Layer::TakeUnusedResourcesForChildCompositor(
555    cc::ReturnedResourceArray* list) {
556  if (delegated_renderer_layer_.get())
557    delegated_renderer_layer_->TakeUnusedResourcesForChildCompositor(list);
558}
559
560void Layer::SetColor(SkColor color) {
561  GetAnimator()->SetColor(color);
562}
563
564bool Layer::SchedulePaint(const gfx::Rect& invalid_rect) {
565  if (type_ == LAYER_SOLID_COLOR || (!delegate_ && !texture_.get()))
566    return false;
567
568  damaged_region_.op(invalid_rect.x(),
569                     invalid_rect.y(),
570                     invalid_rect.right(),
571                     invalid_rect.bottom(),
572                     SkRegion::kUnion_Op);
573  ScheduleDraw();
574  return true;
575}
576
577void Layer::ScheduleDraw() {
578  Compositor* compositor = GetCompositor();
579  if (compositor)
580    compositor->ScheduleDraw();
581}
582
583void Layer::SendDamagedRects() {
584  if ((delegate_ || texture_.get()) && !damaged_region_.isEmpty()) {
585    for (SkRegion::Iterator iter(damaged_region_); !iter.done(); iter.next()) {
586      const SkIRect& sk_damaged = iter.rect();
587      gfx::Rect damaged(
588          sk_damaged.x(),
589          sk_damaged.y(),
590          sk_damaged.width(),
591          sk_damaged.height());
592
593      gfx::Rect damaged_in_pixel = ConvertRectToPixel(this, damaged);
594      cc_layer_->SetNeedsDisplayRect(damaged_in_pixel);
595    }
596    damaged_region_.setEmpty();
597  }
598  for (size_t i = 0; i < children_.size(); ++i)
599    children_[i]->SendDamagedRects();
600}
601
602void Layer::SuppressPaint() {
603  if (!delegate_)
604    return;
605  delegate_ = NULL;
606  for (size_t i = 0; i < children_.size(); ++i)
607    children_[i]->SuppressPaint();
608}
609
610void Layer::OnDeviceScaleFactorChanged(float device_scale_factor) {
611  if (device_scale_factor_ == device_scale_factor)
612    return;
613  if (animator_.get())
614    animator_->StopAnimatingProperty(LayerAnimationElement::TRANSFORM);
615  gfx::Transform transform = this->transform();
616  device_scale_factor_ = device_scale_factor;
617  RecomputeCCTransformFromTransform(transform);
618  RecomputeDrawsContentAndUVRect();
619  RecomputePosition();
620  SchedulePaint(gfx::Rect(bounds_.size()));
621  if (delegate_)
622    delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
623  for (size_t i = 0; i < children_.size(); ++i)
624    children_[i]->OnDeviceScaleFactorChanged(device_scale_factor);
625  if (layer_mask_)
626    layer_mask_->OnDeviceScaleFactorChanged(device_scale_factor);
627}
628
629void Layer::RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request) {
630  cc_layer_->RequestCopyOfOutput(request.Pass());
631}
632
633void Layer::PaintContents(SkCanvas* sk_canvas,
634                          gfx::Rect clip,
635                          gfx::RectF* opaque) {
636  TRACE_EVENT0("ui", "Layer::PaintContents");
637  scoped_ptr<gfx::Canvas> canvas(gfx::Canvas::CreateCanvasWithoutScaling(
638      sk_canvas, ui::GetScaleFactorFromScale(device_scale_factor_)));
639
640  bool scale_content = scale_content_;
641  if (scale_content) {
642    canvas->Save();
643    canvas->sk_canvas()->scale(SkFloatToScalar(device_scale_factor_),
644                               SkFloatToScalar(device_scale_factor_));
645  }
646
647  if (delegate_)
648    delegate_->OnPaintLayer(canvas.get());
649  if (scale_content)
650    canvas->Restore();
651}
652
653unsigned Layer::PrepareTexture() {
654  DCHECK(texture_layer_.get());
655  return texture_->PrepareTexture();
656}
657
658WebKit::WebGraphicsContext3D* Layer::Context3d() {
659  DCHECK(texture_layer_.get());
660  if (texture_.get())
661    return texture_->HostContext3D();
662  return NULL;
663}
664
665bool Layer::PrepareTextureMailbox(cc::TextureMailbox* mailbox,
666                                  bool use_shared_memory) {
667  return false;
668}
669
670void Layer::SetForceRenderSurface(bool force) {
671  if (force_render_surface_ == force)
672    return;
673
674  force_render_surface_ = force;
675  cc_layer_->SetForceRenderSurface(force_render_surface_);
676}
677
678void Layer::OnAnimationStarted(const cc::AnimationEvent& event) {
679  if (animator_.get())
680    animator_->OnThreadedAnimationStarted(event);
681}
682
683void Layer::StackRelativeTo(Layer* child, Layer* other, bool above) {
684  DCHECK_NE(child, other);
685  DCHECK_EQ(this, child->parent());
686  DCHECK_EQ(this, other->parent());
687
688  const size_t child_i =
689      std::find(children_.begin(), children_.end(), child) - children_.begin();
690  const size_t other_i =
691      std::find(children_.begin(), children_.end(), other) - children_.begin();
692  if ((above && child_i == other_i + 1) || (!above && child_i + 1 == other_i))
693    return;
694
695  const size_t dest_i =
696      above ?
697      (child_i < other_i ? other_i : other_i + 1) :
698      (child_i < other_i ? other_i - 1 : other_i);
699  children_.erase(children_.begin() + child_i);
700  children_.insert(children_.begin() + dest_i, child);
701
702  child->cc_layer_->RemoveFromParent();
703  cc_layer_->InsertChild(child->cc_layer_, dest_i);
704}
705
706bool Layer::ConvertPointForAncestor(const Layer* ancestor,
707                                    gfx::Point* point) const {
708  gfx::Transform transform;
709  bool result = GetTargetTransformRelativeTo(ancestor, &transform);
710  gfx::Point3F p(*point);
711  transform.TransformPoint(p);
712  *point = gfx::ToFlooredPoint(p.AsPointF());
713  return result;
714}
715
716bool Layer::ConvertPointFromAncestor(const Layer* ancestor,
717                                     gfx::Point* point) const {
718  gfx::Transform transform;
719  bool result = GetTargetTransformRelativeTo(ancestor, &transform);
720  gfx::Point3F p(*point);
721  transform.TransformPointReverse(p);
722  *point = gfx::ToFlooredPoint(p.AsPointF());
723  return result;
724}
725
726void Layer::SetBoundsImmediately(const gfx::Rect& bounds) {
727  if (bounds == bounds_)
728    return;
729
730  base::Closure closure;
731  if (delegate_)
732    closure = delegate_->PrepareForLayerBoundsChange();
733  bool was_move = bounds_.size() == bounds.size();
734  bounds_ = bounds;
735
736  RecomputeDrawsContentAndUVRect();
737  RecomputePosition();
738
739  if (!closure.is_null())
740    closure.Run();
741
742  if (was_move) {
743    // Don't schedule a draw if we're invisible. We'll schedule one
744    // automatically when we get visible.
745    if (IsDrawn())
746      ScheduleDraw();
747  } else {
748    // Always schedule a paint, even if we're invisible.
749    SchedulePaint(gfx::Rect(bounds.size()));
750  }
751}
752
753void Layer::SetTransformImmediately(const gfx::Transform& transform) {
754  RecomputeCCTransformFromTransform(transform);
755}
756
757void Layer::SetOpacityImmediately(float opacity) {
758  cc_layer_->SetOpacity(opacity);
759  ScheduleDraw();
760}
761
762void Layer::SetVisibilityImmediately(bool visible) {
763  if (visible_ == visible)
764    return;
765
766  visible_ = visible;
767  cc_layer_->SetHideLayerAndSubtree(!visible_);
768}
769
770void Layer::SetBrightnessImmediately(float brightness) {
771  layer_brightness_ = brightness;
772  SetLayerFilters();
773}
774
775void Layer::SetGrayscaleImmediately(float grayscale) {
776  layer_grayscale_ = grayscale;
777  SetLayerFilters();
778}
779
780void Layer::SetColorImmediately(SkColor color) {
781  DCHECK_EQ(type_, LAYER_SOLID_COLOR);
782  solid_color_layer_->SetBackgroundColor(color);
783  SetFillsBoundsOpaquely(SkColorGetA(color) == 0xFF);
784}
785
786void Layer::SetBoundsFromAnimation(const gfx::Rect& bounds) {
787  SetBoundsImmediately(bounds);
788}
789
790void Layer::SetTransformFromAnimation(const gfx::Transform& transform) {
791  SetTransformImmediately(transform);
792}
793
794void Layer::SetOpacityFromAnimation(float opacity) {
795  SetOpacityImmediately(opacity);
796}
797
798void Layer::SetVisibilityFromAnimation(bool visibility) {
799  SetVisibilityImmediately(visibility);
800}
801
802void Layer::SetBrightnessFromAnimation(float brightness) {
803  SetBrightnessImmediately(brightness);
804}
805
806void Layer::SetGrayscaleFromAnimation(float grayscale) {
807  SetGrayscaleImmediately(grayscale);
808}
809
810void Layer::SetColorFromAnimation(SkColor color) {
811  SetColorImmediately(color);
812}
813
814void Layer::ScheduleDrawForAnimation() {
815  ScheduleDraw();
816}
817
818const gfx::Rect& Layer::GetBoundsForAnimation() const {
819  return bounds();
820}
821
822gfx::Transform Layer::GetTransformForAnimation() const {
823  return transform();
824}
825
826float Layer::GetOpacityForAnimation() const {
827  return opacity();
828}
829
830bool Layer::GetVisibilityForAnimation() const {
831  return visible();
832}
833
834float Layer::GetBrightnessForAnimation() const {
835  return layer_brightness();
836}
837
838float Layer::GetGrayscaleForAnimation() const {
839  return layer_grayscale();
840}
841
842SkColor Layer::GetColorForAnimation() const {
843  // WebColor is equivalent to SkColor, per WebColor.h.
844  // The NULL check is here since this is invoked regardless of whether we have
845  // been configured as LAYER_SOLID_COLOR.
846  return solid_color_layer_.get() ?
847      solid_color_layer_->background_color() : SK_ColorBLACK;
848}
849
850float Layer::GetDeviceScaleFactor() const {
851  return device_scale_factor_;
852}
853
854void Layer::AddThreadedAnimation(scoped_ptr<cc::Animation> animation) {
855  DCHECK(cc_layer_);
856  // Until this layer has a compositor (and hence cc_layer_ has a
857  // LayerTreeHost), addAnimation will fail.
858  if (GetCompositor())
859    cc_layer_->AddAnimation(animation.Pass());
860  else
861    pending_threaded_animations_.push_back(animation.Pass());
862}
863
864namespace{
865
866struct HasAnimationId {
867  HasAnimationId(int id): id_(id) {
868  }
869
870  bool operator()(cc::Animation* animation) const {
871    return animation->id() == id_;
872  }
873
874 private:
875  int id_;
876};
877
878}
879
880void Layer::RemoveThreadedAnimation(int animation_id) {
881  DCHECK(cc_layer_);
882  if (pending_threaded_animations_.size() == 0) {
883    cc_layer_->RemoveAnimation(animation_id);
884    return;
885  }
886
887  pending_threaded_animations_.erase(
888      cc::remove_if(&pending_threaded_animations_,
889                    pending_threaded_animations_.begin(),
890                    pending_threaded_animations_.end(),
891                    HasAnimationId(animation_id)),
892      pending_threaded_animations_.end());
893}
894
895void Layer::SendPendingThreadedAnimations() {
896  for (cc::ScopedPtrVector<cc::Animation>::iterator it =
897           pending_threaded_animations_.begin();
898       it != pending_threaded_animations_.end();
899       ++it)
900    cc_layer_->AddAnimation(pending_threaded_animations_.take(it));
901
902  pending_threaded_animations_.clear();
903
904  for (size_t i = 0; i < children_.size(); ++i)
905    children_[i]->SendPendingThreadedAnimations();
906}
907
908void Layer::CreateWebLayer() {
909  if (type_ == LAYER_SOLID_COLOR) {
910    solid_color_layer_ = cc::SolidColorLayer::Create();
911    cc_layer_ = solid_color_layer_.get();
912  } else {
913    content_layer_ = cc::ContentLayer::Create(this);
914    cc_layer_ = content_layer_.get();
915  }
916  cc_layer_->SetAnchorPoint(gfx::PointF());
917  cc_layer_->SetContentsOpaque(true);
918  cc_layer_->SetIsDrawable(type_ != LAYER_NOT_DRAWN);
919  cc_layer_->AddLayerAnimationEventObserver(this);
920  RecomputePosition();
921}
922
923void Layer::RecomputeCCTransformFromTransform(const gfx::Transform& transform) {
924  cc_layer_->SetTransform(ConvertTransformToCCTransform(transform,
925                                                        device_scale_factor_));
926}
927
928gfx::Transform Layer::transform() const {
929  gfx::Transform transform;
930  transform.Scale(1.0f / device_scale_factor_, 1.0f / device_scale_factor_);
931  transform.PreconcatTransform(cc_layer_->transform());
932  transform.Scale(device_scale_factor_, device_scale_factor_);
933  return transform;
934}
935
936void Layer::RecomputeDrawsContentAndUVRect() {
937  DCHECK(cc_layer_);
938  gfx::Size size(bounds_.size());
939  if (texture_layer_.get()) {
940    gfx::Size texture_size;
941    if (!texture_layer_->uses_mailbox()) {
942      DCHECK(texture_.get());
943      float texture_scale_factor = 1.0f / texture_->device_scale_factor();
944      texture_size = gfx::ToFlooredSize(
945          gfx::ScaleSize(texture_->size(), texture_scale_factor));
946    } else {
947      DCHECK(mailbox_.IsSharedMemory());
948      float texture_scale_factor = 1.0f / mailbox_scale_factor_;
949      texture_size = gfx::ToFlooredSize(
950          gfx::ScaleSize(mailbox_.shared_memory_size(), texture_scale_factor));
951    }
952    size.SetToMin(texture_size);
953
954    gfx::PointF uv_top_left(0.f, 0.f);
955    gfx::PointF uv_bottom_right(
956        static_cast<float>(size.width())/texture_size.width(),
957        static_cast<float>(size.height())/texture_size.height());
958    texture_layer_->SetUV(uv_top_left, uv_bottom_right);
959  } else if (delegated_renderer_layer_.get()) {
960    delegated_renderer_layer_->SetDisplaySize(
961        ConvertSizeToPixel(this, delegated_frame_size_in_dip_));
962    size.SetToMin(delegated_frame_size_in_dip_);
963  }
964  cc_layer_->SetBounds(ConvertSizeToPixel(this, size));
965}
966
967void Layer::RecomputePosition() {
968  cc_layer_->SetPosition(gfx::ScalePoint(
969        gfx::PointF(bounds_.x(), bounds_.y()),
970        device_scale_factor_));
971}
972
973}  // namespace ui
974