1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "LayerRejecter.h"
18
19 #include <gui/BufferItem.h>
20
21 #include "clz.h"
22
23 #define DEBUG_RESIZE 0
24
25 namespace android {
26
LayerRejecter(Layer::State & front,Layer::State & current,bool & recomputeVisibleRegions,bool stickySet,const char * name,int32_t overrideScalingMode,bool & freezePositionUpdates)27 LayerRejecter::LayerRejecter(Layer::State& front,
28 Layer::State& current,
29 bool& recomputeVisibleRegions,
30 bool stickySet,
31 const char* name,
32 int32_t overrideScalingMode,
33 bool& freezePositionUpdates)
34 : mFront(front),
35 mCurrent(current),
36 mRecomputeVisibleRegions(recomputeVisibleRegions),
37 mStickyTransformSet(stickySet),
38 mName(name),
39 mOverrideScalingMode(overrideScalingMode),
40 mFreezeGeometryUpdates(freezePositionUpdates) {}
41
reject(const sp<GraphicBuffer> & buf,const BufferItem & item)42 bool LayerRejecter::reject(const sp<GraphicBuffer>& buf, const BufferItem& item) {
43 if (buf == NULL) {
44 return false;
45 }
46
47 uint32_t bufWidth = buf->getWidth();
48 uint32_t bufHeight = buf->getHeight();
49
50 // check that we received a buffer of the right size
51 // (Take the buffer's orientation into account)
52 if (item.mTransform & Transform::ROT_90) {
53 swap(bufWidth, bufHeight);
54 }
55
56 int actualScalingMode = mOverrideScalingMode >= 0 ? mOverrideScalingMode : item.mScalingMode;
57 bool isFixedSize = actualScalingMode != NATIVE_WINDOW_SCALING_MODE_FREEZE;
58 if (mFront.active != mFront.requested) {
59 if (isFixedSize || (bufWidth == mFront.requested.w && bufHeight == mFront.requested.h)) {
60 // Here we pretend the transaction happened by updating the
61 // current and drawing states. Drawing state is only accessed
62 // in this thread, no need to have it locked
63 mFront.active = mFront.requested;
64
65 // We also need to update the current state so that
66 // we don't end-up overwriting the drawing state with
67 // this stale current state during the next transaction
68 //
69 // NOTE: We don't need to hold the transaction lock here
70 // because State::active is only accessed from this thread.
71 mCurrent.active = mFront.active;
72 mCurrent.modified = true;
73
74 // recompute visible region
75 mRecomputeVisibleRegions = true;
76
77 mFreezeGeometryUpdates = false;
78
79 if (mFront.crop != mFront.requestedCrop) {
80 mFront.crop = mFront.requestedCrop;
81 mCurrent.crop = mFront.requestedCrop;
82 mRecomputeVisibleRegions = true;
83 }
84 if (mFront.finalCrop != mFront.requestedFinalCrop) {
85 mFront.finalCrop = mFront.requestedFinalCrop;
86 mCurrent.finalCrop = mFront.requestedFinalCrop;
87 mRecomputeVisibleRegions = true;
88 }
89 }
90
91 ALOGD_IF(DEBUG_RESIZE,
92 "[%s] latchBuffer/reject: buffer (%ux%u, tr=%02x), scalingMode=%d\n"
93 " drawing={ active ={ wh={%4u,%4u} crop={%4d,%4d,%4d,%4d} (%4d,%4d) "
94 "}\n"
95 " requested={ wh={%4u,%4u} }}\n",
96 mName, bufWidth, bufHeight, item.mTransform, item.mScalingMode, mFront.active.w,
97 mFront.active.h, mFront.crop.left, mFront.crop.top, mFront.crop.right,
98 mFront.crop.bottom, mFront.crop.getWidth(), mFront.crop.getHeight(),
99 mFront.requested.w, mFront.requested.h);
100 }
101
102 if (!isFixedSize && !mStickyTransformSet) {
103 if (mFront.active.w != bufWidth || mFront.active.h != bufHeight) {
104 // reject this buffer
105 ALOGE("[%s] rejecting buffer: "
106 "bufWidth=%d, bufHeight=%d, front.active.{w=%d, h=%d}",
107 mName, bufWidth, bufHeight, mFront.active.w, mFront.active.h);
108 return true;
109 }
110 }
111
112 // if the transparent region has changed (this test is
113 // conservative, but that's fine, worst case we're doing
114 // a bit of extra work), we latch the new one and we
115 // trigger a visible-region recompute.
116 //
117 // We latch the transparent region here, instead of above where we latch
118 // the rest of the geometry because it is only content but not necessarily
119 // resize dependent.
120 if (!mFront.activeTransparentRegion.isTriviallyEqual(mFront.requestedTransparentRegion)) {
121 mFront.activeTransparentRegion = mFront.requestedTransparentRegion;
122
123 // We also need to update the current state so that
124 // we don't end-up overwriting the drawing state with
125 // this stale current state during the next transaction
126 //
127 // NOTE: We don't need to hold the transaction lock here
128 // because State::active is only accessed from this thread.
129 mCurrent.activeTransparentRegion = mFront.activeTransparentRegion;
130
131 // recompute visible region
132 mRecomputeVisibleRegions = true;
133 }
134
135 return false;
136 }
137
138 } // namespace android
139