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IABSD.fr/xenocara/lib/xcb-util-cursor/cursor/cursor.c
matthieu
- lib/xcb-util-cursor/cursor/cursor.c
-
/* * 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); }