LayerRejecter.cpp revision 6a3c05bcfab588fd99dd8d619a53d15374e99507 
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#include <system/window.h>
21
22#include "clz.h"
23
24#define DEBUG_RESIZE 0
25
26namespace android {
27
28LayerRejecter::LayerRejecter(Layer::State& front,
29                             Layer::State& current,
30                             bool& recomputeVisibleRegions,
31                             bool stickySet,
32                             const char* name,
33                             int32_t overrideScalingMode,
34                             bool& freezePositionUpdates)
35  : mFront(front),
36    mCurrent(current),
37    mRecomputeVisibleRegions(recomputeVisibleRegions),
38    mStickyTransformSet(stickySet),
39    mName(name),
40    mOverrideScalingMode(overrideScalingMode),
41    mFreezePositionUpdates(freezePositionUpdates) {}
42
43bool LayerRejecter::reject(const sp<GraphicBuffer>& buf, const BufferItem& item) {
44    if (buf == NULL) {
45        return false;
46    }
47
48    uint32_t bufWidth = buf->getWidth();
49    uint32_t bufHeight = buf->getHeight();
50
51    // check that we received a buffer of the right size
52    // (Take the buffer's orientation into account)
53    if (item.mTransform & Transform::ROT_90) {
54        swap(bufWidth, bufHeight);
55    }
56
57    int actualScalingMode = mOverrideScalingMode >= 0 ? mOverrideScalingMode : item.mScalingMode;
58    bool isFixedSize = actualScalingMode != NATIVE_WINDOW_SCALING_MODE_FREEZE;
59    if (mFront.active != mFront.requested) {
60        if (isFixedSize || (bufWidth == mFront.requested.w && bufHeight == mFront.requested.h)) {
61            // Here we pretend the transaction happened by updating the
62            // current and drawing states. Drawing state is only accessed
63            // in this thread, no need to have it locked
64            mFront.active = mFront.requested;
65
66            // We also need to update the current state so that
67            // we don't end-up overwriting the drawing state with
68            // this stale current state during the next transaction
69            //
70            // NOTE: We don't need to hold the transaction lock here
71            // because State::active is only accessed from this thread.
72            mCurrent.active = mFront.active;
73            mCurrent.modified = true;
74
75            // recompute visible region
76            mRecomputeVisibleRegions = true;
77        }
78
79        ALOGD_IF(DEBUG_RESIZE,
80                 "[%s] latchBuffer/reject: buffer (%ux%u, tr=%02x), scalingMode=%d\n"
81                 "  drawing={ active   ={ wh={%4u,%4u} crop={%4d,%4d,%4d,%4d} (%4d,%4d) "
82                 "}\n"
83                 "            requested={ wh={%4u,%4u} }}\n",
84                 mName, bufWidth, bufHeight, item.mTransform, item.mScalingMode, mFront.active.w,
85                 mFront.active.h, mFront.crop.left, mFront.crop.top, mFront.crop.right,
86                 mFront.crop.bottom, mFront.crop.getWidth(), mFront.crop.getHeight(),
87                 mFront.requested.w, mFront.requested.h);
88    }
89
90    if (!isFixedSize && !mStickyTransformSet) {
91        if (mFront.active.w != bufWidth || mFront.active.h != bufHeight) {
92            // reject this buffer
93            ALOGE("[%s] rejecting buffer: "
94                  "bufWidth=%d, bufHeight=%d, front.active.{w=%d, h=%d}",
95                  mName, bufWidth, bufHeight, mFront.active.w, mFront.active.h);
96            return true;
97        }
98    }
99
100    // if the transparent region has changed (this test is
101    // conservative, but that's fine, worst case we're doing
102    // a bit of extra work), we latch the new one and we
103    // trigger a visible-region recompute.
104    if (!mFront.activeTransparentRegion.isTriviallyEqual(mFront.requestedTransparentRegion)) {
105        mFront.activeTransparentRegion = mFront.requestedTransparentRegion;
106
107        // We also need to update the current state so that
108        // we don't end-up overwriting the drawing state with
109        // this stale current state during the next transaction
110        //
111        // NOTE: We don't need to hold the transaction lock here
112        // because State::active is only accessed from this thread.
113        mCurrent.activeTransparentRegion = mFront.activeTransparentRegion;
114
115        // recompute visible region
116        mRecomputeVisibleRegions = true;
117    }
118
119    if (mFront.crop != mFront.requestedCrop) {
120        mFront.crop = mFront.requestedCrop;
121        mCurrent.crop = mFront.requestedCrop;
122        mRecomputeVisibleRegions = true;
123    }
124    if (mFront.finalCrop != mFront.requestedFinalCrop) {
125        mFront.finalCrop = mFront.requestedFinalCrop;
126        mCurrent.finalCrop = mFront.requestedFinalCrop;
127        mRecomputeVisibleRegions = true;
128    }
129    mFreezePositionUpdates = false;
130
131    return false;
132}
133
134}  // namespace android
135