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/*
* vim:ts=4:sw=4:expandtab
*
* Copyright © 2013 Michael Stapelberg
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the names of the authors or their
* institutions shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization from the authors.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <xcb/xcb.h>
#include <xcb/xcb_renderutil.h>
#include "cursor.h"
#include "xcb_cursor.h"
/*
* Parses the root window’s RESOURCE_MANAGER atom contents and stores the
* attributes declared above in resource_manager_val.
*
*/
static void parse_resource_manager(xcb_cursor_context_t *c, const xcb_get_property_reply_t *rm_reply) {
int rm_length;
char *rm = NULL;
char *saveptr = NULL;
char *line = NULL;
char *sep = NULL;
if (rm_reply == NULL || (rm_length = xcb_get_property_value_length(rm_reply)) == 0)
return;
if (asprintf(&rm, "%.*s", rm_length, (char*)xcb_get_property_value(rm_reply)) == -1)
return;
for (char *str = rm; ; str = NULL) {
if ((line = strtok_r(str, "\n", &saveptr)) == NULL)
break;
/* Split the string at the delimiting : */
if ((sep = strchr(line, ':')) == NULL) {
/* Invalid line?! */
free(rm);
return;
}
*(sep++) = '\0';
while (isspace(*sep))
sep++;
/* strdup() may return NULL, which is interpreted later as the key not
* being available. */
if (strcmp(line, "Xcursor.theme") == 0) {
free(c->rm[RM_XCURSOR_THEME]);
c->rm[RM_XCURSOR_THEME] = strdup(sep);
} else if (strcmp(line, "Xcursor.size") == 0) {
free(c->rm[RM_XCURSOR_SIZE]);
c->rm[RM_XCURSOR_SIZE] = strdup(sep);
} else if (strcmp(line, "Xft.dpi") == 0) {
free(c->rm[RM_XFT_DPI]);
c->rm[RM_XFT_DPI] = strdup(sep);
}
}
free(rm);
}
/*
* Tries to figure out the cursor size by checking:
* 1. The environment variable XCURSOR_SIZE
* 2. The RESOURCE_MANAGER entry Xcursor.size
* 3. Guess with the RESOURCE_MANAGER entry Xft.dpi * 16 / 72
* 4. Guess with the display size.
*
*/
static uint32_t get_default_size(xcb_cursor_context_t *c, xcb_screen_t *screen) {
char *env;
uint16_t dim;
if ((env = getenv("XCURSOR_SIZE")) != NULL)
return atoi(env);
if (c->rm[RM_XCURSOR_SIZE] != NULL)
return atoi(c->rm[RM_XCURSOR_SIZE]);
if (c->rm[RM_XFT_DPI] != NULL) {
const int dpi = atoi(c->rm[RM_XFT_DPI]);
if (dpi > 0)
return dpi * 16 / 72;
}
if (screen->height_in_pixels < screen->width_in_pixels)
dim = screen->height_in_pixels;
else
dim = screen->width_in_pixels;
return dim / 48;
}
int xcb_cursor_context_new(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_context_t **ctx) {
xcb_cursor_context_t *c;
const xcb_query_extension_reply_t *ext;
xcb_get_property_cookie_t rm_cookie;
xcb_get_property_reply_t *rm_reply;
xcb_render_query_pict_formats_cookie_t pf_cookie;
xcb_render_query_version_cookie_t ver_cookie;
if ((*ctx = calloc(1, sizeof(struct xcb_cursor_context_t))) == NULL)
return -errno;
c = *ctx;
c->conn = conn;
c->root = screen->root;
c->render_version = RV_NONE;
ext = xcb_get_extension_data(conn, &xcb_render_id);
// XXX: Is it maybe necessary to ever use long_offset != 0?
// XXX: proper length? xlib seems to use 100 MB o_O
rm_cookie = xcb_get_property(conn, 0, c->root, XCB_ATOM_RESOURCE_MANAGER, XCB_ATOM_STRING, 0, 16 * 1024);
if (ext && ext->present) {
ver_cookie = xcb_render_query_version(conn, XCB_RENDER_MAJOR_VERSION, XCB_RENDER_MINOR_VERSION);
pf_cookie = xcb_render_query_pict_formats(conn);
}
c->cursor_font = xcb_generate_id(conn);
xcb_open_font(conn, c->cursor_font, strlen("cursor"), "cursor");
rm_reply = xcb_get_property_reply(conn, rm_cookie, NULL);
parse_resource_manager(c, rm_reply);
free(rm_reply);
if (ext && ext->present) {
xcb_render_query_version_reply_t *reply = xcb_render_query_version_reply(conn, ver_cookie, NULL);
if (reply && (reply->major_version >= 1 || reply->minor_version >= 8))
c->render_version = RV_ANIM_CURSOR;
else if (reply && (reply->major_version >= 1 || reply->minor_version >= 5))
c->render_version = RV_CURSOR;
free(reply);
c->pf_reply = xcb_render_query_pict_formats_reply(conn, pf_cookie, NULL);
c->pict_format = xcb_render_util_find_standard_format(c->pf_reply, XCB_PICT_STANDARD_ARGB_32);
}
c->size = get_default_size(c, screen);
return 0;
}
void xcb_cursor_context_free(xcb_cursor_context_t *c) {
free(c->rm[RM_XCURSOR_THEME]);
free(c->rm[RM_XCURSOR_SIZE]);
free(c->rm[RM_XFT_DPI]);
free(c->pf_reply);
free(c);
}
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