1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved.
4  *
5  * Not a Contribution, Apache license notifications and license are retained
6  * for attribution purposes only.
7  *
8  * Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at
11  *
12  *      http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 #ifndef HWC_COPYBIT_H
21 #define HWC_COPYBIT_H
22 #include "hwc_utils.h"
23 
24 #define NUM_RENDER_BUFFERS 3
25 //These scaling factors are specific for MDP3. Normally scaling factor
26 //is only 4, but copybit will create temp buffer to let it run through
27 //twice
28 #define MAX_SCALE_FACTOR 16
29 #define MIN_SCALE_FACTOR 0.0625
30 #define MAX_LAYERS_FOR_ABC 2
31 namespace qhwc {
32 
33 class CopyBit {
34 public:
35     CopyBit(hwc_context_t *ctx, const int& dpy);
36     ~CopyBit();
37     // API to get copybit engine(non static)
38     struct copybit_device_t *getCopyBitDevice();
39     //Sets up members and prepares copybit if conditions are met
40     bool prepare(hwc_context_t *ctx, hwc_display_contents_1_t *list,
41                                                                    int dpy);
42     //Draws layer if the layer is set for copybit in prepare
43     bool draw(hwc_context_t *ctx, hwc_display_contents_1_t *list,
44                                                         int dpy, int* fd);
45     // resets the values
46     void reset();
47 
48     private_handle_t * getCurrentRenderBuffer();
49 
50     void setReleaseFd(int fd);
51 
52     void setReleaseFdSync(int fd);
53 
54     bool prepareOverlap(hwc_context_t *ctx, hwc_display_contents_1_t *list);
55 
56     int drawOverlap(hwc_context_t *ctx, hwc_display_contents_1_t *list);
57 
58 private:
59     /* cached data */
60     struct LayerCache {
61       int layerCount;
62       buffer_handle_t hnd[MAX_NUM_APP_LAYERS];
63       /* c'tor */
64       LayerCache();
65       /* clear caching info*/
66       void reset();
67       void updateCounts(hwc_context_t *ctx, hwc_display_contents_1_t *list,
68               int dpy);
69     };
70     /* framebuffer cache*/
71     struct FbCache {
72       hwc_rect_t  FbdirtyRect[NUM_RENDER_BUFFERS];
73       int FbIndex;
74       FbCache();
75       void reset();
76       void insertAndUpdateFbCache(hwc_rect_t dirtyRect);
77       int getUnchangedFbDRCount(hwc_rect_t dirtyRect);
78     };
79 
80     // holds the copybit device
81     struct copybit_device_t *mEngine;
82     bool drawUsingAppBufferComposition(hwc_context_t *ctx,
83                                 hwc_display_contents_1_t *list,
84                                 int dpy, int *fd);
85     // Helper functions for copybit composition
86     int  drawLayerUsingCopybit(hwc_context_t *dev, hwc_layer_1_t *layer,
87                           private_handle_t *renderBuffer, bool isFG);
88     // Helper function to draw copybit layer for PTOR comp
89     int drawRectUsingCopybit(hwc_context_t *dev, hwc_layer_1_t *layer,
90                           private_handle_t *renderBuffer, hwc_rect_t overlap,
91                           hwc_rect_t destRect);
92     int fillColorUsingCopybit(hwc_layer_1_t *layer,
93                           private_handle_t *renderBuffer);
94     bool canUseCopybitForYUV (hwc_context_t *ctx);
95     bool canUseCopybitForRGB (hwc_context_t *ctx,
96                                      hwc_display_contents_1_t *list, int dpy);
97     bool validateParams (hwc_context_t *ctx,
98                                 const hwc_display_contents_1_t *list);
99     //Flags if this feature is on.
100     bool mIsModeOn;
101     // flag that indicates whether CopyBit composition is enabled for this cycle
102     bool mCopyBitDraw;
103 
104     unsigned int getRGBRenderingArea
105                             (const hwc_display_contents_1_t *list);
106 
107     void getLayerResolution(const hwc_layer_1_t* layer,
108                                    unsigned int &width, unsigned int& height);
109 
110     int allocRenderBuffers(int w, int h, int f);
111 
112     void freeRenderBuffers();
113 
114     int clear (private_handle_t* hnd, hwc_rect_t& rect);
115 
116     private_handle_t* mRenderBuffer[NUM_RENDER_BUFFERS];
117 
118     // Index of the current intermediate render buffer
119     int mCurRenderBufferIndex;
120 
121     // Release FDs of the intermediate render buffer
122     int mRelFd[NUM_RENDER_BUFFERS];
123 
124     //Dynamic composition threshold for deciding copybit usage.
125     double mDynThreshold;
126     bool mSwapRectEnable;
127     int mAlignedWidth;
128     int mAlignedHeight;
129     int mDirtyLayerIndex;
130     LayerCache mLayerCache;
131     FbCache mFbCache;
132     int getLayersChanging(hwc_context_t *ctx, hwc_display_contents_1_t *list,
133                   int dpy);
134     int checkDirtyRect(hwc_context_t *ctx, hwc_display_contents_1_t *list,
135                   int dpy);
136 };
137 
138 }; //namespace qhwc
139 
140 #endif //HWC_COPYBIT_H
141