The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | #include <stdint.h> |
| 5 | #include <sys/types.h> |
| 6 | |
| 7 | #include <unistd.h> |
| 8 | #include <fcntl.h> |
| 9 | #include <math.h> |
| 10 | #include <time.h> |
| 11 | #include <errno.h> |
| 12 | |
| 13 | #include <sys/resource.h> |
| 14 | #include <sys/syscall.h> |
| 15 | #include <sys/mman.h> |
| 16 | |
| 17 | #include <linux/fb.h> |
| 18 | |
| 19 | int64_t systemTime() |
| 20 | { |
| 21 | struct timespec t; |
| 22 | t.tv_sec = t.tv_nsec = 0; |
| 23 | clock_gettime(CLOCK_MONOTONIC, &t); |
| 24 | return (int64_t)(t.tv_sec)*1000000000LL + t.tv_nsec; |
| 25 | } |
| 26 | |
| 27 | int main(int argc, char** argv) |
| 28 | { |
| 29 | char const * const device_template[] = { |
| 30 | "/dev/graphics/fb%u", |
| 31 | "/dev/fb%u", |
| 32 | 0 }; |
| 33 | int fd = -1; |
| 34 | int i=0; |
| 35 | int j=0; |
| 36 | char name[64]; |
| 37 | while ((fd==-1) && device_template[i]) { |
| 38 | snprintf(name, 64, device_template[i], 0); |
| 39 | fd = open(name, O_RDWR, 0); |
| 40 | i++; |
| 41 | } |
| 42 | if (fd < 0) |
| 43 | return -errno; |
| 44 | |
| 45 | struct fb_fix_screeninfo finfo; |
| 46 | if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1) |
| 47 | return -errno; |
| 48 | |
| 49 | struct fb_var_screeninfo info; |
| 50 | if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1) |
| 51 | return -errno; |
| 52 | |
| 53 | info.reserved[0] = 0; |
| 54 | info.reserved[1] = 0; |
| 55 | info.reserved[2] = 0; |
| 56 | info.xoffset = 0; |
| 57 | info.yoffset = 0; |
| 58 | info.bits_per_pixel = 16; |
| 59 | info.activate = FB_ACTIVATE_NOW; |
| 60 | |
| 61 | if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) { |
| 62 | printf("FBIOPUT_VSCREENINFO failed (%d x %d)\n", |
| 63 | info.xres_virtual, info.yres_virtual); |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1) |
| 68 | return -errno; |
| 69 | |
Iain Merrick | b0878e4 | 2011-11-07 15:46:48 +0000 | [diff] [blame] | 70 | uint64_t denominator = (uint64_t)( info.upper_margin + info.lower_margin + info.yres ) |
| 71 | * ( info.left_margin + info.right_margin + info.xres ) |
| 72 | * info.pixclock; |
| 73 | int refreshRate = denominator ? (1000000000000000LLU / denominator) : 0; |
The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 74 | |
| 75 | float xdpi = (info.xres * 25.4f) / info.width; |
| 76 | float ydpi = (info.yres * 25.4f) / info.height; |
| 77 | float fps = refreshRate / 1000.0f; |
| 78 | |
| 79 | printf( "using (fd=%d)\n" |
| 80 | "id = %s\n" |
| 81 | "xres = %d px\n" |
| 82 | "yres = %d px\n" |
| 83 | "xres_virtual = %d px\n" |
| 84 | "yres_virtual = %d px\n" |
| 85 | "bpp = %d\n" |
| 86 | "r = %2u:%u\n" |
| 87 | "g = %2u:%u\n" |
| 88 | "b = %2u:%u\n", |
| 89 | fd, |
| 90 | finfo.id, |
| 91 | info.xres, |
| 92 | info.yres, |
| 93 | info.xres_virtual, |
| 94 | info.yres_virtual, |
| 95 | info.bits_per_pixel, |
| 96 | info.red.offset, info.red.length, |
| 97 | info.green.offset, info.green.length, |
| 98 | info.blue.offset, info.blue.length |
| 99 | ); |
| 100 | |
| 101 | printf( "width = %d mm (%f dpi)\n" |
| 102 | "height = %d mm (%f dpi)\n" |
| 103 | "refresh rate = %.2f Hz\n", |
| 104 | info.width, xdpi, |
| 105 | info.height, ydpi, |
| 106 | fps |
| 107 | ); |
| 108 | |
| 109 | printf("upper_margin=%d, lower_margin=%d, left_margin=%d, right_margin=%d, pixclock=%d, finfo.smem_len=%d\n", |
| 110 | info.upper_margin, info.lower_margin, info.left_margin, info.right_margin, info.pixclock, finfo.smem_len); |
| 111 | |
| 112 | if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1) |
| 113 | return -errno; |
| 114 | |
| 115 | if (finfo.smem_len <= 0) |
| 116 | return -errno; |
| 117 | |
| 118 | /* |
| 119 | * Open and map the display. |
| 120 | */ |
| 121 | |
| 122 | uint16_t* buffer = (uint16_t*) mmap( |
| 123 | 0, finfo.smem_len, |
| 124 | PROT_READ | PROT_WRITE, |
| 125 | MAP_SHARED, |
| 126 | fd, 0); |
| 127 | |
| 128 | if (buffer == MAP_FAILED) |
| 129 | return -errno; |
| 130 | |
| 131 | // at least for now, always clear the fb |
| 132 | memset(buffer, 0, finfo.smem_len); |
| 133 | memset(buffer, 0xff, 320*(info.yres_virtual/2)*2); |
| 134 | |
| 135 | int l,t,w,h; |
| 136 | l=0; |
| 137 | t=0; |
| 138 | w=320; |
| 139 | h=480; |
| 140 | info.reserved[0] = 0x54445055; // "UPDT"; |
| 141 | info.reserved[1] = (uint16_t)l | ((uint32_t)t << 16); |
| 142 | info.reserved[2] = (uint16_t)(l+w) | ((uint32_t)(t+h) << 16); |
| 143 | |
| 144 | int err; |
| 145 | int c = 0; |
| 146 | int64_t time = systemTime(); |
| 147 | while (1) { |
| 148 | |
| 149 | info.activate = FB_ACTIVATE_VBL; |
| 150 | info.yoffset = 0; |
| 151 | ioctl(fd, FBIOPUT_VSCREENINFO, &info); |
| 152 | |
| 153 | info.activate = FB_ACTIVATE_VBL; |
| 154 | info.yoffset = info.yres_virtual/2; |
| 155 | err = ioctl(fd, FBIOPUT_VSCREENINFO, &info); |
| 156 | |
| 157 | c+=2; |
| 158 | if (c==60*2) { |
| 159 | int64_t now = systemTime(); |
| 160 | time = now - time; |
| 161 | printf("refresh rate = %f Hz\n", (c*1000000000.0 / (double)time)); |
| 162 | c = 0; |
| 163 | time = now; |
| 164 | } |
| 165 | } |
| 166 | return 0; |
| 167 | } |