1 /*
2  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
3 
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are
6  * met:
7  *     * Redistributions of source code must retain the above copyright
8  *       notice, this list of conditions and the following disclaimer.
9  *     * Redistributions in binary form must reproduce the above
10  *       copyright notice, this list of conditions and the following
11  *       disclaimer in the documentation and/or other materials provided
12  *       with the distribution.
13  *     * Neither the name of The Linux Foundation nor the names of its
14  *       contributors may be used to endorse or promote products derived
15  *       from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include "qd_utils.h"
31 
32 
33 #define MAX_FRAME_BUFFER_NAME_SIZE      (80)
34 #define QD_UTILS_DEBUG 0
35 
getHDMINode(void)36 int getHDMINode(void)
37 {
38     FILE *displayDeviceFP = NULL;
39     char fbType[MAX_FRAME_BUFFER_NAME_SIZE];
40     char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
41     int j = 0;
42 
43     for(j = 0; j < HWC_NUM_DISPLAY_TYPES; j++) {
44         snprintf (msmFbTypePath, sizeof(msmFbTypePath),
45                   "/sys/class/graphics/fb%d/msm_fb_type", j);
46         displayDeviceFP = fopen(msmFbTypePath, "r");
47         if(displayDeviceFP) {
48             fread(fbType, sizeof(char), MAX_FRAME_BUFFER_NAME_SIZE,
49                     displayDeviceFP);
50             if(strncmp(fbType, "dtv panel", strlen("dtv panel")) == 0) {
51                 ALOGD("%s: HDMI is at fb%d", __func__, j);
52                 fclose(displayDeviceFP);
53                 break;
54             }
55             fclose(displayDeviceFP);
56         } else {
57             ALOGE("%s: Failed to open fb node %d", __func__, j);
58         }
59     }
60 
61     if (j < HWC_NUM_DISPLAY_TYPES)
62         return j;
63     else
64         ALOGE("%s: Failed to find HDMI node", __func__);
65 
66     return -1;
67 }
68 
getEdidRawData(char * buffer)69 int getEdidRawData(char *buffer)
70 {
71     int size;
72     int edidFile;
73     char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
74     int node_id = getHDMINode();
75 
76     if (node_id < 0) {
77         ALOGE("%s no HDMI node found", __func__);
78         return 0;
79     }
80 
81     snprintf(msmFbTypePath, sizeof(msmFbTypePath),
82                  "/sys/class/graphics/fb%d/edid_raw_data", node_id);
83 
84    edidFile = open(msmFbTypePath, O_RDONLY, 0);
85 
86     if (edidFile < 0) {
87         ALOGE("%s no edid raw data found", __func__);
88         return 0;
89     }
90 
91     size = (int)read(edidFile, (char*)buffer, EDID_RAW_DATA_SIZE);
92     close(edidFile);
93     return size;
94 }
95 
96 /* Calculates the aspect ratio for based on src & dest */
getAspectRatioPosition(int destWidth,int destHeight,int srcWidth,int srcHeight,hwc_rect_t & rect)97 void getAspectRatioPosition(int destWidth, int destHeight, int srcWidth,
98                                 int srcHeight, hwc_rect_t& rect) {
99    int x =0, y =0;
100 
101    if (srcWidth * destHeight > destWidth * srcHeight) {
102         srcHeight = destWidth * srcHeight / srcWidth;
103         srcWidth = destWidth;
104     } else if (srcWidth * destHeight < destWidth * srcHeight) {
105         srcWidth = destHeight * srcWidth / srcHeight;
106         srcHeight = destHeight;
107     } else {
108         srcWidth = destWidth;
109         srcHeight = destHeight;
110     }
111     if (srcWidth > destWidth) srcWidth = destWidth;
112     if (srcHeight > destHeight) srcHeight = destHeight;
113     x = (destWidth - srcWidth) / 2;
114     y = (destHeight - srcHeight) / 2;
115     ALOGD_IF(QD_UTILS_DEBUG, "%s: AS Position: x = %d, y = %d w = %d h = %d",
116              __FUNCTION__, x, y, srcWidth , srcHeight);
117     // Convert it back to hwc_rect_t
118     rect.left = x;
119     rect.top = y;
120     rect.right = srcWidth + rect.left;
121     rect.bottom = srcHeight + rect.top;
122 }
123 
124