1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
|
// Copyright 2014 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 "android_webview/browser/browser_view_renderer.h"
#include "android_webview/browser/browser_view_renderer_client.h"
#include "android_webview/browser/child_frame.h"
#include "base/auto_reset.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/supports_user_data.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/output/compositor_frame.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_switches.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"
#include "ui/gfx/geometry/vector2d_conversions.h"
namespace android_webview {
namespace {
const double kEpsilon = 1e-8;
const int64 kFallbackTickTimeoutInMilliseconds = 100;
// Used to calculate memory allocation. Determined experimentally.
const size_t kMemoryMultiplier = 20;
const size_t kBytesPerPixel = 4;
const size_t kMemoryAllocationStep = 5 * 1024 * 1024;
uint64 g_memory_override_in_bytes = 0u;
const void* kBrowserViewRendererUserDataKey = &kBrowserViewRendererUserDataKey;
class BrowserViewRendererUserData : public base::SupportsUserData::Data {
public:
BrowserViewRendererUserData(BrowserViewRenderer* ptr) : bvr_(ptr) {}
static BrowserViewRenderer* GetBrowserViewRenderer(
content::WebContents* web_contents) {
if (!web_contents)
return NULL;
BrowserViewRendererUserData* data =
static_cast<BrowserViewRendererUserData*>(
web_contents->GetUserData(kBrowserViewRendererUserDataKey));
return data ? data->bvr_ : NULL;
}
private:
BrowserViewRenderer* bvr_;
};
} // namespace
// static
void BrowserViewRenderer::CalculateTileMemoryPolicy() {
base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
// If the value was overridden on the command line, use the specified value.
bool client_hard_limit_bytes_overridden =
cl->HasSwitch(switches::kForceGpuMemAvailableMb);
if (client_hard_limit_bytes_overridden) {
base::StringToUint64(
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kForceGpuMemAvailableMb),
&g_memory_override_in_bytes);
g_memory_override_in_bytes *= 1024 * 1024;
}
}
// static
BrowserViewRenderer* BrowserViewRenderer::FromWebContents(
content::WebContents* web_contents) {
return BrowserViewRendererUserData::GetBrowserViewRenderer(web_contents);
}
BrowserViewRenderer::BrowserViewRenderer(
BrowserViewRendererClient* client,
const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner)
: client_(client),
shared_renderer_state_(ui_task_runner, this),
ui_task_runner_(ui_task_runner),
compositor_(NULL),
is_paused_(false),
view_visible_(false),
window_visible_(false),
attached_to_window_(false),
hardware_enabled_(false),
dip_scale_(0.0),
page_scale_factor_(1.0),
on_new_picture_enable_(false),
clear_view_(false),
offscreen_pre_raster_(false),
fallback_tick_pending_(false) {
}
BrowserViewRenderer::~BrowserViewRenderer() {
}
void BrowserViewRenderer::RegisterWithWebContents(
content::WebContents* web_contents) {
web_contents->SetUserData(kBrowserViewRendererUserDataKey,
new BrowserViewRendererUserData(this));
}
SharedRendererState* BrowserViewRenderer::GetAwDrawGLViewContext() {
return &shared_renderer_state_;
}
bool BrowserViewRenderer::RequestDrawGL(bool wait_for_completion) {
return client_->RequestDrawGL(wait_for_completion);
}
void BrowserViewRenderer::TrimMemory(const int level, const bool visible) {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
// Constants from Android ComponentCallbacks2.
enum {
TRIM_MEMORY_RUNNING_LOW = 10,
TRIM_MEMORY_UI_HIDDEN = 20,
TRIM_MEMORY_BACKGROUND = 40,
TRIM_MEMORY_MODERATE = 60,
};
// Not urgent enough. TRIM_MEMORY_UI_HIDDEN is treated specially because
// it does not indicate memory pressure, but merely that the app is
// backgrounded.
if (level < TRIM_MEMORY_RUNNING_LOW || level == TRIM_MEMORY_UI_HIDDEN)
return;
// Do not release resources on view we expect to get DrawGL soon.
if (level < TRIM_MEMORY_BACKGROUND && visible)
return;
// Nothing to drop.
if (!compositor_ || !hardware_enabled_)
return;
TRACE_EVENT0("android_webview", "BrowserViewRenderer::TrimMemory");
// If offscreen pre-raster is disabled, drop everything in hardware. Otherwise
// keep the tiles and just delete the HardwareRenderer.
if (level >= TRIM_MEMORY_MODERATE) {
if (offscreen_pre_raster_)
shared_renderer_state_.DeleteHardwareRendererOnUI();
else
shared_renderer_state_.ReleaseHardwareDrawIfNeededOnUI();
return;
}
// Just set the memory limit to 0 and drop all tiles. This will be reset to
// normal levels in the next DrawGL call.
if (!offscreen_pre_raster_)
compositor_->SetMemoryPolicy(0u);
}
void BrowserViewRenderer::UpdateMemoryPolicy() {
if (!hardware_enabled_) {
compositor_->SetMemoryPolicy(0u);
return;
}
size_t bytes_limit = 0u;
if (g_memory_override_in_bytes) {
bytes_limit = static_cast<size_t>(g_memory_override_in_bytes);
} else {
gfx::Rect interest_rect = offscreen_pre_raster_
? gfx::Rect(size_)
: last_on_draw_global_visible_rect_;
size_t width = interest_rect.width();
size_t height = interest_rect.height();
bytes_limit = kMemoryMultiplier * kBytesPerPixel * width * height;
// Round up to a multiple of kMemoryAllocationStep.
bytes_limit =
(bytes_limit / kMemoryAllocationStep + 1) * kMemoryAllocationStep;
}
compositor_->SetMemoryPolicy(bytes_limit);
}
void BrowserViewRenderer::PrepareToDraw(const gfx::Vector2d& scroll,
const gfx::Rect& global_visible_rect) {
last_on_draw_scroll_offset_ = scroll;
last_on_draw_global_visible_rect_ = global_visible_rect;
}
bool BrowserViewRenderer::CanOnDraw() {
if (!compositor_) {
TRACE_EVENT_INSTANT0("android_webview", "EarlyOut_NoCompositor",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
if (clear_view_) {
TRACE_EVENT_INSTANT0("android_webview", "EarlyOut_ClearView",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
return true;
}
bool BrowserViewRenderer::OnDrawHardware() {
TRACE_EVENT0("android_webview", "BrowserViewRenderer::OnDrawHardware");
shared_renderer_state_.InitializeHardwareDrawIfNeededOnUI();
if (!CanOnDraw()) {
return false;
}
shared_renderer_state_.SetScrollOffsetOnUI(last_on_draw_scroll_offset_);
hardware_enabled_ = true;
return CompositeHw();
}
bool BrowserViewRenderer::CompositeHw() {
CancelFallbackTick();
ReturnResourceFromParent();
UpdateMemoryPolicy();
ParentCompositorDrawConstraints parent_draw_constraints =
shared_renderer_state_.GetParentDrawConstraintsOnUI();
gfx::Size surface_size(size_);
gfx::Rect viewport(surface_size);
gfx::Rect clip = viewport;
gfx::Transform transform_for_tile_priority =
parent_draw_constraints.transform;
// If the WebView is on a layer, WebView does not know what transform is
// applied onto the layer so global visible rect does not make sense here.
// In this case, just use the surface rect for tiling.
gfx::Rect viewport_rect_for_tile_priority;
// Leave viewport_rect_for_tile_priority empty if offscreen_pre_raster_ is on.
if (!offscreen_pre_raster_) {
if (parent_draw_constraints.is_layer) {
viewport_rect_for_tile_priority = parent_draw_constraints.surface_rect;
} else {
viewport_rect_for_tile_priority = last_on_draw_global_visible_rect_;
}
}
scoped_ptr<cc::CompositorFrame> frame =
compositor_->DemandDrawHw(surface_size,
gfx::Transform(),
viewport,
clip,
viewport_rect_for_tile_priority,
transform_for_tile_priority);
if (!frame.get()) {
TRACE_EVENT_INSTANT0("android_webview", "NoNewFrame",
TRACE_EVENT_SCOPE_THREAD);
return false;
}
scoped_ptr<ChildFrame> child_frame = make_scoped_ptr(
new ChildFrame(frame.Pass(), viewport_rect_for_tile_priority,
transform_for_tile_priority, offscreen_pre_raster_,
parent_draw_constraints.is_layer));
// Uncommitted frame can happen with consecutive fallback ticks.
ReturnUnusedResource(shared_renderer_state_.PassUncommittedFrameOnUI());
shared_renderer_state_.SetCompositorFrameOnUI(child_frame.Pass());
return true;
}
void BrowserViewRenderer::UpdateParentDrawConstraints() {
PostInvalidateWithFallback();
ParentCompositorDrawConstraints parent_draw_constraints =
shared_renderer_state_.GetParentDrawConstraintsOnUI();
client_->ParentDrawConstraintsUpdated(parent_draw_constraints);
}
void BrowserViewRenderer::ReturnUnusedResource(
scoped_ptr<ChildFrame> child_frame) {
if (!child_frame.get() || !child_frame->frame.get())
return;
cc::CompositorFrameAck frame_ack;
cc::TransferableResource::ReturnResources(
child_frame->frame->delegated_frame_data->resource_list,
&frame_ack.resources);
if (compositor_ && !frame_ack.resources.empty())
compositor_->ReturnResources(frame_ack);
}
void BrowserViewRenderer::ReturnResourceFromParent() {
cc::CompositorFrameAck frame_ack;
shared_renderer_state_.SwapReturnedResourcesOnUI(&frame_ack.resources);
if (compositor_ && !frame_ack.resources.empty()) {
compositor_->ReturnResources(frame_ack);
}
}
void BrowserViewRenderer::DetachFunctorFromView() {
client_->DetachFunctorFromView();
}
bool BrowserViewRenderer::OnDrawSoftware(SkCanvas* canvas) {
return CanOnDraw() && CompositeSW(canvas);
}
skia::RefPtr<SkPicture> BrowserViewRenderer::CapturePicture(int width,
int height) {
TRACE_EVENT0("android_webview", "BrowserViewRenderer::CapturePicture");
// Return empty Picture objects for empty SkPictures.
if (width <= 0 || height <= 0) {
SkPictureRecorder emptyRecorder;
emptyRecorder.beginRecording(0, 0);
return skia::AdoptRef(emptyRecorder.endRecording());
}
// Reset scroll back to the origin, will go back to the old
// value when scroll_reset is out of scope.
base::AutoReset<gfx::Vector2dF> scroll_reset(&scroll_offset_dip_,
gfx::Vector2dF());
SkPictureRecorder recorder;
SkCanvas* rec_canvas = recorder.beginRecording(width, height, NULL, 0);
if (compositor_)
CompositeSW(rec_canvas);
return skia::AdoptRef(recorder.endRecording());
}
void BrowserViewRenderer::EnableOnNewPicture(bool enabled) {
on_new_picture_enable_ = enabled;
}
void BrowserViewRenderer::ClearView() {
TRACE_EVENT_INSTANT0("android_webview",
"BrowserViewRenderer::ClearView",
TRACE_EVENT_SCOPE_THREAD);
if (clear_view_)
return;
clear_view_ = true;
// Always invalidate ignoring the compositor to actually clear the webview.
PostInvalidateWithFallback();
}
void BrowserViewRenderer::SetOffscreenPreRaster(bool enable) {
if (offscreen_pre_raster_ != enable && compositor_)
UpdateMemoryPolicy();
offscreen_pre_raster_ = enable;
}
void BrowserViewRenderer::SetIsPaused(bool paused) {
TRACE_EVENT_INSTANT1("android_webview",
"BrowserViewRenderer::SetIsPaused",
TRACE_EVENT_SCOPE_THREAD,
"paused",
paused);
is_paused_ = paused;
UpdateCompositorIsActive();
}
void BrowserViewRenderer::SetViewVisibility(bool view_visible) {
TRACE_EVENT_INSTANT1("android_webview",
"BrowserViewRenderer::SetViewVisibility",
TRACE_EVENT_SCOPE_THREAD,
"view_visible",
view_visible);
view_visible_ = view_visible;
}
void BrowserViewRenderer::SetWindowVisibility(bool window_visible) {
TRACE_EVENT_INSTANT1("android_webview",
"BrowserViewRenderer::SetWindowVisibility",
TRACE_EVENT_SCOPE_THREAD,
"window_visible",
window_visible);
window_visible_ = window_visible;
UpdateCompositorIsActive();
}
void BrowserViewRenderer::OnSizeChanged(int width, int height) {
TRACE_EVENT_INSTANT2("android_webview",
"BrowserViewRenderer::OnSizeChanged",
TRACE_EVENT_SCOPE_THREAD,
"width",
width,
"height",
height);
size_.SetSize(width, height);
}
void BrowserViewRenderer::OnAttachedToWindow(int width, int height) {
TRACE_EVENT2("android_webview",
"BrowserViewRenderer::OnAttachedToWindow",
"width",
width,
"height",
height);
attached_to_window_ = true;
size_.SetSize(width, height);
UpdateCompositorIsActive();
}
void BrowserViewRenderer::OnDetachedFromWindow() {
TRACE_EVENT0("android_webview", "BrowserViewRenderer::OnDetachedFromWindow");
shared_renderer_state_.ReleaseHardwareDrawIfNeededOnUI();
attached_to_window_ = false;
DCHECK(!hardware_enabled_);
UpdateCompositorIsActive();
}
void BrowserViewRenderer::ReleaseHardware() {
DCHECK(hardware_enabled_);
ReturnUnusedResource(shared_renderer_state_.PassUncommittedFrameOnUI());
ReturnResourceFromParent();
DCHECK(shared_renderer_state_.ReturnedResourcesEmptyOnUI());
if (compositor_) {
compositor_->SetMemoryPolicy(0u);
}
hardware_enabled_ = false;
}
bool BrowserViewRenderer::IsVisible() const {
// Ignore |window_visible_| if |attached_to_window_| is false.
return view_visible_ && (!attached_to_window_ || window_visible_);
}
gfx::Rect BrowserViewRenderer::GetScreenRect() const {
return gfx::Rect(client_->GetLocationOnScreen(), size_);
}
void BrowserViewRenderer::DidInitializeCompositor(
content::SynchronousCompositor* compositor) {
TRACE_EVENT0("android_webview",
"BrowserViewRenderer::DidInitializeCompositor");
DCHECK(compositor);
DCHECK(!compositor_);
compositor_ = compositor;
UpdateCompositorIsActive();
}
void BrowserViewRenderer::DidDestroyCompositor(
content::SynchronousCompositor* compositor) {
TRACE_EVENT0("android_webview", "BrowserViewRenderer::DidDestroyCompositor");
DCHECK(compositor_);
compositor_ = NULL;
}
void BrowserViewRenderer::SetDipScale(float dip_scale) {
dip_scale_ = dip_scale;
CHECK_GT(dip_scale_, 0.f);
}
gfx::Vector2d BrowserViewRenderer::max_scroll_offset() const {
DCHECK_GT(dip_scale_, 0.f);
return gfx::ToCeiledVector2d(gfx::ScaleVector2d(
max_scroll_offset_dip_, dip_scale_ * page_scale_factor_));
}
void BrowserViewRenderer::ScrollTo(gfx::Vector2d scroll_offset) {
gfx::Vector2d max_offset = max_scroll_offset();
gfx::Vector2dF scroll_offset_dip;
// To preserve the invariant that scrolling to the maximum physical pixel
// value also scrolls to the maximum dip pixel value we transform the physical
// offset into the dip offset by using a proportion (instead of dividing by
// dip_scale * page_scale_factor).
if (max_offset.x()) {
scroll_offset_dip.set_x((scroll_offset.x() * max_scroll_offset_dip_.x()) /
max_offset.x());
}
if (max_offset.y()) {
scroll_offset_dip.set_y((scroll_offset.y() * max_scroll_offset_dip_.y()) /
max_offset.y());
}
DCHECK_LE(0.f, scroll_offset_dip.x());
DCHECK_LE(0.f, scroll_offset_dip.y());
DCHECK(scroll_offset_dip.x() < max_scroll_offset_dip_.x() ||
scroll_offset_dip.x() - max_scroll_offset_dip_.x() < kEpsilon)
<< scroll_offset_dip.x() << " " << max_scroll_offset_dip_.x();
DCHECK(scroll_offset_dip.y() < max_scroll_offset_dip_.y() ||
scroll_offset_dip.y() - max_scroll_offset_dip_.y() < kEpsilon)
<< scroll_offset_dip.y() << " " << max_scroll_offset_dip_.y();
if (scroll_offset_dip_ == scroll_offset_dip)
return;
scroll_offset_dip_ = scroll_offset_dip;
TRACE_EVENT_INSTANT2("android_webview",
"BrowserViewRenderer::ScrollTo",
TRACE_EVENT_SCOPE_THREAD,
"x",
scroll_offset_dip.x(),
"y",
scroll_offset_dip.y());
if (compositor_)
compositor_->DidChangeRootLayerScrollOffset();
}
void BrowserViewRenderer::DidUpdateContent() {
TRACE_EVENT_INSTANT0("android_webview",
"BrowserViewRenderer::DidUpdateContent",
TRACE_EVENT_SCOPE_THREAD);
clear_view_ = false;
if (on_new_picture_enable_)
client_->OnNewPicture();
}
void BrowserViewRenderer::SetTotalRootLayerScrollOffset(
gfx::Vector2dF scroll_offset_dip) {
// TOOD(mkosiba): Add a DCHECK to say that this does _not_ get called during
// DrawGl when http://crbug.com/249972 is fixed.
if (scroll_offset_dip_ == scroll_offset_dip)
return;
scroll_offset_dip_ = scroll_offset_dip;
gfx::Vector2d max_offset = max_scroll_offset();
gfx::Vector2d scroll_offset;
// For an explanation as to why this is done this way see the comment in
// BrowserViewRenderer::ScrollTo.
if (max_scroll_offset_dip_.x()) {
scroll_offset.set_x((scroll_offset_dip.x() * max_offset.x()) /
max_scroll_offset_dip_.x());
}
if (max_scroll_offset_dip_.y()) {
scroll_offset.set_y((scroll_offset_dip.y() * max_offset.y()) /
max_scroll_offset_dip_.y());
}
DCHECK_LE(0, scroll_offset.x());
DCHECK_LE(0, scroll_offset.y());
DCHECK_LE(scroll_offset.x(), max_offset.x());
DCHECK_LE(scroll_offset.y(), max_offset.y());
client_->ScrollContainerViewTo(scroll_offset);
}
gfx::Vector2dF BrowserViewRenderer::GetTotalRootLayerScrollOffset() {
return scroll_offset_dip_;
}
bool BrowserViewRenderer::IsExternalFlingActive() const {
return client_->IsFlingActive();
}
void BrowserViewRenderer::UpdateRootLayerState(
const gfx::Vector2dF& total_scroll_offset_dip,
const gfx::Vector2dF& max_scroll_offset_dip,
const gfx::SizeF& scrollable_size_dip,
float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor) {
TRACE_EVENT_INSTANT1(
"android_webview",
"BrowserViewRenderer::UpdateRootLayerState",
TRACE_EVENT_SCOPE_THREAD,
"state",
RootLayerStateAsValue(total_scroll_offset_dip, scrollable_size_dip));
DCHECK_GT(dip_scale_, 0.f);
max_scroll_offset_dip_ = max_scroll_offset_dip;
DCHECK_LE(0.f, max_scroll_offset_dip_.x());
DCHECK_LE(0.f, max_scroll_offset_dip_.y());
page_scale_factor_ = page_scale_factor;
DCHECK_GT(page_scale_factor_, 0.f);
client_->UpdateScrollState(max_scroll_offset(),
scrollable_size_dip,
page_scale_factor,
min_page_scale_factor,
max_page_scale_factor);
SetTotalRootLayerScrollOffset(total_scroll_offset_dip);
}
scoped_refptr<base::trace_event::ConvertableToTraceFormat>
BrowserViewRenderer::RootLayerStateAsValue(
const gfx::Vector2dF& total_scroll_offset_dip,
const gfx::SizeF& scrollable_size_dip) {
scoped_refptr<base::trace_event::TracedValue> state =
new base::trace_event::TracedValue();
state->SetDouble("total_scroll_offset_dip.x", total_scroll_offset_dip.x());
state->SetDouble("total_scroll_offset_dip.y", total_scroll_offset_dip.y());
state->SetDouble("max_scroll_offset_dip.x", max_scroll_offset_dip_.x());
state->SetDouble("max_scroll_offset_dip.y", max_scroll_offset_dip_.y());
state->SetDouble("scrollable_size_dip.width", scrollable_size_dip.width());
state->SetDouble("scrollable_size_dip.height", scrollable_size_dip.height());
state->SetDouble("page_scale_factor", page_scale_factor_);
return state;
}
void BrowserViewRenderer::DidOverscroll(gfx::Vector2dF accumulated_overscroll,
gfx::Vector2dF latest_overscroll_delta,
gfx::Vector2dF current_fling_velocity) {
const float physical_pixel_scale = dip_scale_ * page_scale_factor_;
if (accumulated_overscroll == latest_overscroll_delta)
overscroll_rounding_error_ = gfx::Vector2dF();
gfx::Vector2dF scaled_overscroll_delta =
gfx::ScaleVector2d(latest_overscroll_delta, physical_pixel_scale);
gfx::Vector2d rounded_overscroll_delta = gfx::ToRoundedVector2d(
scaled_overscroll_delta + overscroll_rounding_error_);
overscroll_rounding_error_ =
scaled_overscroll_delta - rounded_overscroll_delta;
client_->DidOverscroll(rounded_overscroll_delta);
}
void BrowserViewRenderer::PostInvalidate() {
TRACE_EVENT_INSTANT0("android_webview", "BrowserViewRenderer::PostInvalidate",
TRACE_EVENT_SCOPE_THREAD);
PostInvalidateWithFallback();
}
void BrowserViewRenderer::PostInvalidateWithFallback() {
// Always call view invalidate. We rely the Android framework to ignore the
// invalidate when it's not needed such as when view is not visible.
client_->PostInvalidate();
// Stop fallback ticks when one of these is true.
// 1) Webview is paused. Also need to check we are not in clear view since
// paused, offscreen still expect clear view to recover.
// 2) If we are attached to window and the window is not visible (eg when
// app is in the background). We are sure in this case the webview is used
// "on-screen" but that updates are not needed when in the background.
bool throttle_fallback_tick =
(is_paused_ && !clear_view_) || (attached_to_window_ && !window_visible_);
if (throttle_fallback_tick || fallback_tick_pending_)
return;
DCHECK(post_fallback_tick_.IsCancelled());
DCHECK(fallback_tick_fired_.IsCancelled());
post_fallback_tick_.Reset(base::Bind(&BrowserViewRenderer::PostFallbackTick,
base::Unretained(this)));
ui_task_runner_->PostTask(FROM_HERE, post_fallback_tick_.callback());
fallback_tick_pending_ = true;
}
void BrowserViewRenderer::CancelFallbackTick() {
post_fallback_tick_.Cancel();
fallback_tick_fired_.Cancel();
fallback_tick_pending_ = false;
}
void BrowserViewRenderer::PostFallbackTick() {
DCHECK(fallback_tick_fired_.IsCancelled());
TRACE_EVENT0("android_webview", "BrowserViewRenderer::PostFallbackTick");
post_fallback_tick_.Cancel();
fallback_tick_fired_.Reset(base::Bind(&BrowserViewRenderer::FallbackTickFired,
base::Unretained(this)));
ui_task_runner_->PostDelayedTask(
FROM_HERE, fallback_tick_fired_.callback(),
base::TimeDelta::FromMilliseconds(kFallbackTickTimeoutInMilliseconds));
}
void BrowserViewRenderer::FallbackTickFired() {
TRACE_EVENT0("android_webview", "BrowserViewRenderer::FallbackTickFired");
// This should only be called if OnDraw or DrawGL did not come in time, which
// means fallback_tick_pending_ must still be true.
DCHECK(fallback_tick_pending_);
fallback_tick_fired_.Cancel();
fallback_tick_pending_ = false;
if (compositor_) {
if (hardware_enabled_) {
CompositeHw();
} else {
ForceFakeCompositeSW();
}
}
}
void BrowserViewRenderer::ForceFakeCompositeSW() {
DCHECK(compositor_);
SkBitmap bitmap;
bitmap.allocN32Pixels(1, 1);
bitmap.eraseColor(0);
SkCanvas canvas(bitmap);
CompositeSW(&canvas);
}
bool BrowserViewRenderer::CompositeSW(SkCanvas* canvas) {
DCHECK(compositor_);
CancelFallbackTick();
ReturnResourceFromParent();
return compositor_->DemandDrawSw(canvas);
}
void BrowserViewRenderer::UpdateCompositorIsActive() {
if (compositor_)
compositor_->SetIsActive(!is_paused_ &&
(!attached_to_window_ || window_visible_));
}
std::string BrowserViewRenderer::ToString() const {
std::string str;
base::StringAppendF(&str, "is_paused: %d ", is_paused_);
base::StringAppendF(&str, "view_visible: %d ", view_visible_);
base::StringAppendF(&str, "window_visible: %d ", window_visible_);
base::StringAppendF(&str, "dip_scale: %f ", dip_scale_);
base::StringAppendF(&str, "page_scale_factor: %f ", page_scale_factor_);
base::StringAppendF(&str, "fallback_tick_pending: %d ",
fallback_tick_pending_);
base::StringAppendF(&str, "view size: %s ", size_.ToString().c_str());
base::StringAppendF(&str, "attached_to_window: %d ", attached_to_window_);
base::StringAppendF(&str,
"global visible rect: %s ",
last_on_draw_global_visible_rect_.ToString().c_str());
base::StringAppendF(
&str, "scroll_offset_dip: %s ", scroll_offset_dip_.ToString().c_str());
base::StringAppendF(&str,
"overscroll_rounding_error_: %s ",
overscroll_rounding_error_.ToString().c_str());
base::StringAppendF(
&str, "on_new_picture_enable: %d ", on_new_picture_enable_);
base::StringAppendF(&str, "clear_view: %d ", clear_view_);
return str;
}
} // namespace android_webview
|