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#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include "any_log.h"
#include "display.h"
void display_init(display_t *display)
{
memset(display, 0, sizeof(display_t));
int preferred_screen = 0;
display->connection = xcb_connect(NULL, &preferred_screen);
assert(display->connection != NULL && !xcb_connection_has_error(display->connection));
log_value_debug("Connected to xcb"
"i:preferred_screen", preferred_screen);
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(display->connection));
while (preferred_screen != 0 && iter.rem) {
xcb_screen_next(&iter);
preferred_screen--;
}
display->screen = iter.data;
xcb_generic_error_t *error;
xcb_randr_query_version_cookie_t version_cookie = xcb_randr_query_version(display->connection,
XCB_RANDR_MAJOR_VERSION,
XCB_RANDR_MINOR_VERSION);
xcb_randr_query_version_reply_t *randr_version = xcb_randr_query_version_reply(display->connection,
version_cookie,
&error);
assert(error == NULL);
log_value_trace("Found RandR extension",
"i:major", randr_version->major_version,
"i:minor", randr_version->minor_version);
assert(randr_version->major_version >= 1);
free(randr_version);
xcb_randr_get_screen_info_cookie_t cookie = xcb_randr_get_screen_info(display->connection, display->screen->root);
display->info_reply = xcb_randr_get_screen_info_reply(display->connection, cookie, &error);
assert(error == NULL);
display->screen_size = xcb_randr_get_screen_info_sizes(display->info_reply);
assert(display->screen_size != NULL);
log_value_info("Display size",
"i:width", display->screen_size->width,
"i:height", display->screen_size->height);
xcb_randr_select_input(display->connection,
display->screen->root,
XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
log_trace("Searching 32 bit visual");
display->visual_type = xcb_aux_find_visual_by_attrs(display->screen, XCB_VISUAL_CLASS_TRUE_COLOR, 32);
display->screen_depth = 32;
if (display->visual_type == NULL) {
// NOTE: 24 bit visuals don't have the alpha channel for transparency
log_trace("Falling back to 24 bit visual");
display->visual_type = xcb_aux_find_visual_by_attrs(display->screen, XCB_VISUAL_CLASS_TRUE_COLOR, 24);
display->screen_depth = 24;
}
assert(display->visual_type != 0);
xcb_intern_atom_cookie_t *ewmh_cookie = xcb_ewmh_init_atoms(display->connection, &display->ewmh);
assert(xcb_ewmh_init_atoms_replies(&display->ewmh, ewmh_cookie, &error));
assert(error == NULL);
log_trace("Initialized xcb_ewmh");
display->database = xcb_xrm_database_from_default(display->connection);
assert(display->database != NULL);
display_update_scale(display);
assert(xcb_errors_context_new(display->connection, &display->errors) == 0);
log_trace("Initialized xcb_errors");
xcb_flush(display->connection);
}
bool display_query_xrm(display_t *display, const char *resource, char **value)
{
bool found = xcb_xrm_resource_get_string(display->database, resource, NULL, value) >= 0;
log_value_trace("Xrm query",
"b:found", found,
"s:resource", resource,
"s:value", *value ? *value : "");
return found;
}
void display_update_xrm(display_t *display)
{
xcb_flush(display->connection);
xcb_xrm_database_t *database = xcb_xrm_database_from_default(display->connection);
if (database == NULL) {
log_warn("Xrm database couldn't be updated");
return;
}
xcb_xrm_database_free(display->database);
display->database = database;
log_trace("Xrm database updated");
}
void display_update_scale(display_t *display)
{
char *dpi_value;
if (display_query_xrm(display, "Xft.dpi", &dpi_value)) {
display->screen_dpi = strtod(dpi_value, NULL);
free(dpi_value);
// Ignore invalid values
if (display->screen_dpi != 0)
return;
}
display->screen_dpi = (double)display->screen_size->height * 25.4 / (double)display->screen_size->mheight;
log_debug("Fallback dpi value '%.2lf'", display->screen_dpi);
}
void display_close(display_t *display)
{
xcb_ewmh_connection_wipe(&display->ewmh);
xcb_errors_context_free(display->errors);
xcb_xrm_database_free(display->database);
xcb_disconnect(display->connection);
free(display->info_reply);
}
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