forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 2
/
ReadbackProcessor.cpp
198 lines (178 loc) · 6.98 KB
/
ReadbackProcessor.cpp
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
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "ReadbackProcessor.h"
namespace mozilla {
namespace layers {
void
ReadbackProcessor::BuildUpdates(ContainerLayer* aContainer)
{
NS_ASSERTION(mAllUpdates.IsEmpty(), "Some updates not processed?");
if (!aContainer->mMayHaveReadbackChild)
return;
aContainer->mMayHaveReadbackChild = PR_FALSE;
// go backwards so the updates read from earlier layers are later in the
// array.
for (Layer* l = aContainer->GetLastChild(); l; l = l->GetPrevSibling()) {
if (l->GetType() == Layer::TYPE_READBACK) {
aContainer->mMayHaveReadbackChild = PR_TRUE;
BuildUpdatesForLayer(static_cast<ReadbackLayer*>(l));
}
}
}
static Layer*
FindBackgroundLayer(ReadbackLayer* aLayer, nsIntPoint* aOffset)
{
gfxMatrix transform;
if (!aLayer->GetTransform().Is2D(&transform) ||
transform.HasNonIntegerTranslation())
return nsnull;
nsIntPoint transformOffset(PRInt32(transform.x0), PRInt32(transform.y0));
for (Layer* l = aLayer->GetPrevSibling(); l; l = l->GetPrevSibling()) {
gfxMatrix backgroundTransform;
if (!l->GetTransform().Is2D(&backgroundTransform) ||
backgroundTransform.HasNonIntegerTranslation())
return nsnull;
nsIntPoint backgroundOffset(PRInt32(backgroundTransform.x0), PRInt32(backgroundTransform.y0));
nsIntRect rectInBackground(transformOffset - backgroundOffset, aLayer->GetSize());
const nsIntRegion& visibleRegion = l->GetEffectiveVisibleRegion();
if (!visibleRegion.Intersects(rectInBackground))
continue;
// Since l is present in the background, from here on we either choose l
// or nothing.
if (!visibleRegion.Contains(rectInBackground))
return nsnull;
if (l->GetEffectiveOpacity() != 1.0 ||
!(l->GetContentFlags() & Layer::CONTENT_OPAQUE))
return nsnull;
// cliprects are post-transform
const nsIntRect* clipRect = l->GetEffectiveClipRect();
if (clipRect && !clipRect->Contains(nsIntRect(transformOffset, aLayer->GetSize())))
return nsnull;
Layer::LayerType type = l->GetType();
if (type != Layer::TYPE_COLOR && type != Layer::TYPE_THEBES)
return nsnull;
*aOffset = backgroundOffset - transformOffset;
return l;
}
return nsnull;
}
void
ReadbackProcessor::BuildUpdatesForLayer(ReadbackLayer* aLayer)
{
if (!aLayer->mSink)
return;
nsIntPoint offset;
Layer* newBackground = FindBackgroundLayer(aLayer, &offset);
if (!newBackground) {
aLayer->SetUnknown();
return;
}
if (newBackground->GetType() == Layer::TYPE_COLOR) {
ColorLayer* colorLayer = static_cast<ColorLayer*>(newBackground);
if (aLayer->mBackgroundColor != colorLayer->GetColor()) {
aLayer->mBackgroundLayer = nsnull;
aLayer->mBackgroundColor = colorLayer->GetColor();
NS_ASSERTION(aLayer->mBackgroundColor.a == 1.0,
"Color layer said it was opaque!");
nsRefPtr<gfxContext> ctx =
aLayer->mSink->BeginUpdate(aLayer->GetRect(),
aLayer->AllocateSequenceNumber());
if (ctx) {
ctx->SetColor(aLayer->mBackgroundColor);
nsIntSize size = aLayer->GetSize();
ctx->Rectangle(gfxRect(0, 0, size.width, size.height));
ctx->Fill();
aLayer->mSink->EndUpdate(ctx, aLayer->GetRect());
}
}
} else {
NS_ASSERTION(newBackground->AsThebesLayer(), "Must be ThebesLayer");
ThebesLayer* thebesLayer = static_cast<ThebesLayer*>(newBackground);
// updateRect is relative to the ThebesLayer
nsIntRect updateRect = aLayer->GetRect() - offset;
if (thebesLayer != aLayer->mBackgroundLayer ||
offset != aLayer->mBackgroundLayerOffset) {
aLayer->mBackgroundLayer = thebesLayer;
aLayer->mBackgroundLayerOffset = offset;
aLayer->mBackgroundColor = gfxRGBA(0,0,0,0);
thebesLayer->SetUsedForReadback(true);
} else {
nsIntRegion invalid;
invalid.Sub(updateRect, thebesLayer->GetValidRegion());
updateRect = invalid.GetBounds();
}
Update update = { aLayer, updateRect, aLayer->AllocateSequenceNumber() };
mAllUpdates.AppendElement(update);
}
}
void
ReadbackProcessor::GetThebesLayerUpdates(ThebesLayer* aLayer,
nsTArray<Update>* aUpdates,
nsIntRegion* aUpdateRegion)
{
// All ThebesLayers used for readback are in mAllUpdates (some possibly
// with an empty update rect).
aLayer->SetUsedForReadback(false);
if (aUpdateRegion) {
aUpdateRegion->SetEmpty();
}
for (PRUint32 i = mAllUpdates.Length(); i > 0; --i) {
const Update& update = mAllUpdates[i - 1];
if (update.mLayer->mBackgroundLayer == aLayer) {
aLayer->SetUsedForReadback(true);
// Don't bother asking for updates if we have an empty update rect.
if (!update.mUpdateRect.IsEmpty()) {
aUpdates->AppendElement(update);
if (aUpdateRegion) {
aUpdateRegion->Or(*aUpdateRegion, update.mUpdateRect);
}
}
mAllUpdates.RemoveElementAt(i - 1);
}
}
}
ReadbackProcessor::~ReadbackProcessor()
{
for (PRUint32 i = mAllUpdates.Length(); i > 0; --i) {
const Update& update = mAllUpdates[i - 1];
// Unprocessed update. Notify the readback sink that this content is
// unknown.
update.mLayer->SetUnknown();
}
}
}
}