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#include <assert.h>
#include <drm_fourcc.h>
#include <stdio.h>
#include <stddef.h>
#include <sys/mman.h>
#include <xf86drm.h>
#include "common.h"
drmModeConnector *
pick_connector(int drm_fd, drmModeRes *drm_res)
{
int i;
drmModeConnector *connector;
for (i = 0; i < drm_res->count_connectors; i++) {
connector = drmModeGetConnector(drm_fd, drm_res->connectors[i]);
if (connector->connection == DRM_MODE_CONNECTED) {
return connector;
}
drmModeFreeConnector(connector);
}
return NULL;
}
drmModeCrtc *
pick_crtc(int drm_fd, drmModeRes *drm_res, drmModeConnector *connector)
{
drmModeEncoder *enc;
uint32_t crtc_id;
int i;
int j;
bool found;
enc = drmModeGetEncoder(drm_fd, connector->encoder_id);
if (enc) {
/* Current CRTC happens to be usable on the selected connector */
crtc_id = enc->crtc_id;
drmModeFreeEncoder(enc);
return drmModeGetCrtc(drm_fd, crtc_id);
} else {
/* Current CRTC used by this encoder can't drive the selected connector.
* Search all of them for a valid combination. */
for (i = 0, found = false; !found && i < connector->count_encoders; i++) {
enc = drmModeGetEncoder(drm_fd, connector->encoders[i]);
if (!enc) {
continue;
}
for (j = 0; !found && j < drm_res->count_crtcs; j++) {
/* Can the CRTC drive the connector? */
if (enc->possible_crtcs & (1 << j)) {
crtc_id = drm_res->crtcs[j];
found = true;
}
}
drmModeFreeEncoder(enc);
}
if (found) {
return drmModeGetCrtc(drm_fd, crtc_id);
} else {
return NULL;
}
}
}
void
disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res, uint32_t crtc_id)
{
int i;
for (i = 0; i < drm_res->count_crtcs; i++) {
if (drm_res->crtcs[i] == crtc_id) {
continue;
}
drmModeSetCrtc(drm_fd, drm_res->crtcs[i],
0, 0, 0, NULL, 0, NULL);
}
}
bool
dumb_fb_init(struct dumb_fb *fb, int drm_fd, uint32_t format, uint32_t width,
uint32_t height)
{
int ret;
uint32_t fb_id;
struct drm_mode_create_dumb create;
uint32_t handles[4] = {0};
uint32_t strides[4] = {0};
uint32_t offsets[4] = { 0 };
assert(format == DRM_FORMAT_ARGB8888 || format == DRM_FORMAT_XRGB8888);
create = (struct drm_mode_create_dumb) {
.width = width,
.height = height,
.bpp = 32,
.flags = 0,
};
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
if (ret < 0) {
return false;
}
handles[0] = create.handle;
strides[0] = create.pitch;
ret = drmModeAddFB2(drm_fd, width, height, format, handles, strides,
offsets, &fb_id, 0);
if (ret < 0) {
return false;
}
fb->width = width;
fb->height = height;
fb->stride = create.pitch;
fb->size = create.size;
fb->handle = create.handle;
fb->id = fb_id;
return true;
}
void *
dumb_fb_map(struct dumb_fb *fb, int drm_fd)
{
int ret;
struct drm_mode_map_dumb map = { .handle = fb->handle };
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
if (ret < 0) {
return MAP_FAILED;
}
return mmap(0, fb->size, PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
(off_t)map.offset);
}
void
dumb_fb_fill(struct dumb_fb *fb, int drm_fd, uint32_t color)
{
uint32_t *data;
size_t i;
data = dumb_fb_map(fb, drm_fd);
if (data == MAP_FAILED) {
return;
}
for (i = 0; i < fb->size / sizeof(uint32_t); i++) {
data[i] = color;
}
munmap(data, fb->size);
}
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