Created
February 18, 2015 19:59
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drmModeResPtr res; | |
drmModeCrtcPtr crtc; | |
drmModeFBPtr fb; | |
struct drm_mode_map_dumb mreq; | |
int ret; | |
uint8_t *map; | |
size_t size; | |
unsigned int i, j, off; | |
uint8_t r, g, b; | |
FILE *file = fopen("/root/LOG", "a"); | |
res = drmModeGetResources(pARMSOC->drmFD); | |
crtc = drmModeGetCrtc(pARMSOC->drmFD, res->crtcs[0]); | |
fb = drmModeGetFB(pARMSOC->drmFD, crtc->buffer_id); | |
fprintf(file, "crtc->buffer_id: %d, fb->handle: %d\n", crtc->buffer_id, fb->handle); | |
memset(&mreq, 0, sizeof(mreq)); | |
mreq.handle = fb->handle; | |
ret = drmIoctl(pARMSOC->drmFD, DRM_IOCTL_MODE_MAP_DUMB, &mreq); | |
if (ret) { | |
fprintf(file, "error in drmIoctl\n"); | |
} | |
size = fb->pitch * fb->height; | |
map = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, pARMSOC->drmFD, mreq.offset); | |
if (map == MAP_FAILED) { | |
fprintf(file, "error in mmap\n"); | |
} | |
srand(time(NULL)); | |
memset(map, 0, size); | |
for (j = 0; j < fb->height; j++) { | |
for (i = 0; i < fb->width; i++) { | |
r = rand() % 0xff; | |
g = rand() % 0xff; | |
b = rand() % 0xff; | |
off = fb->pitch * j + i * 4; | |
*(uint32_t *)&map[off] = (r << 16) | (g << 8) | b; | |
} | |
} | |
fclose(file); | |
drmModeFreeCrtc(crtc); | |
drmModeFreeResources(res); | |
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