gri3-wm/src/xcb.c

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/*
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* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
*
* © 2009-2010 Michael Stapelberg and contributors
*
* See file LICENSE for license information.
*
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* xcb.c: Helper functions for easier usage of XCB
*
*/
#include "all.h"
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TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
unsigned int xcb_numlock_mask;
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/*
* Loads a font for usage, also getting its height. If fallback is true,
* i3 loads 'fixed' or '-misc-*' if the font cannot be found instead of
* exiting.
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*
*/
i3Font load_font(const char *pattern, bool fallback) {
i3Font new;
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xcb_void_cookie_t font_cookie;
xcb_list_fonts_with_info_cookie_t info_cookie;
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/* Send all our requests first */
new.id = xcb_generate_id(conn);
font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
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info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
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/* Check for errors. If errors, fall back to default font. */
xcb_generic_error_t *error = xcb_request_check(conn, font_cookie);
/* If we fail to open font, fall back to 'fixed'. If opening 'fixed' fails fall back to '-misc-*' */
if (error != NULL) {
ELOG("Could not open font %s (X error %d). Reverting to backup font.\n", pattern, error->error_code);
pattern = "fixed";
font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
/* Check if we managed to open 'fixed' */
xcb_generic_error_t *error = xcb_request_check(conn, font_cookie);
/* Fall back to '-misc-*' if opening 'fixed' fails. */
if (error != NULL) {
ELOG("Could not open fallback font '%s', trying with '-misc-*'\n",pattern);
pattern = "-misc-*";
font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
check_error(conn, font_cookie, "Could open neither requested font nor fallback (fixed or -misc-*");
}
}
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/* Get information (height/name) for this font */
xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
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new.height = reply->font_ascent + reply->font_descent;
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free(reply);
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return new;
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}
/*
* Returns the colorpixel to use for the given hex color (think of HTML).
*
* The hex_color has to start with #, for example #FF00FF.
*
* NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
* This has to be done by the caller.
*
*/
uint32_t get_colorpixel(char *hex) {
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char strgroups[3][3] = {{hex[1], hex[2], '\0'},
{hex[3], hex[4], '\0'},
{hex[5], hex[6], '\0'}};
uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
(strtol(strgroups[1], NULL, 16)),
(strtol(strgroups[2], NULL, 16))};
return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
}
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/*
* Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
* for errors.
*
*/
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xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class,
enum xcursor_cursor_t cursor, bool map, uint32_t mask, uint32_t *values) {
xcb_window_t result = xcb_generate_id(conn);
/* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
xcb_create_window(conn,
depth,
result, /* the window id */
root, /* parent == root */
dims.x, dims.y, dims.width, dims.height, /* dimensions */
0, /* border = 0, we draw our own */
window_class,
XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
mask,
values);
/* Set the cursor */
if (xcursor_supported) {
mask = XCB_CW_CURSOR;
values[0] = xcursor_get_cursor(cursor);
xcb_change_window_attributes(conn, result, mask, values);
} else {
xcb_cursor_t cursor_id = xcb_generate_id(conn);
i3Font cursor_font = load_font("cursor", false);
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int xcb_cursor = xcursor_get_xcb_cursor(cursor);
xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id,
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xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535);
xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
xcb_free_cursor(conn, cursor_id);
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}
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/* Map the window (= make it visible) */
if (map)
xcb_map_window(conn, result);
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return result;
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}
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/*
* Changes a single value in the graphic context (so one doesnt have to define an array of values)
*
*/
void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
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xcb_change_gc(conn, gc, mask, &value);
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}
/*
* Draws a line from x,y to to_x,to_y using the given color
*
*/
void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
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xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
xcb_point_t points[] = {{x, y}, {to_x, to_y}};
xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
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}
/*
* Draws a rectangle from x,y with width,height using the given color
*
*/
void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
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xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
xcb_rectangle_t rect = {x, y, width, height};
xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
}
/*
* Generates a configure_notify event and sends it to the given window
* Applications need this to think theyve configured themselves correctly.
* The truth is, however, that we will manage them.
*
*/
void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window, int border_width) {
/* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
* In order to properly initialize these bytes, we allocate 32 bytes even
* though we only need less for an xcb_configure_notify_event_t */
void *event = scalloc(32);
xcb_configure_notify_event_t *generated_event = event;
generated_event->event = window;
generated_event->window = window;
generated_event->response_type = XCB_CONFIGURE_NOTIFY;
generated_event->x = r.x;
generated_event->y = r.y;
generated_event->width = r.width;
generated_event->height = r.height;
generated_event->border_width = border_width;
generated_event->above_sibling = XCB_NONE;
generated_event->override_redirect = false;
xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)generated_event);
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xcb_flush(conn);
free(event);
}
/*
* Generates a configure_notify_event with absolute coordinates (relative to the X root
* window, not to the clients frame) for the given client.
*
*/
void fake_absolute_configure_notify(Con *con) {
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Rect absolute;
if (con->window == NULL)
return;
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absolute.x = con->rect.x + con->window_rect.x;
absolute.y = con->rect.y + con->window_rect.y;
absolute.width = con->window_rect.width;
absolute.height = con->window_rect.height;
DLOG("fake rect = (%d, %d, %d, %d)\n", absolute.x, absolute.y, absolute.width, absolute.height);
fake_configure_notify(conn, absolute, con->window->id, con->border_width);
}
/*
* Sends the WM_TAKE_FOCUS ClientMessage to the given window
*
*/
void send_take_focus(xcb_window_t window) {
/* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
* In order to properly initialize these bytes, we allocate 32 bytes even
* though we only need less for an xcb_configure_notify_event_t */
void *event = scalloc(32);
xcb_client_message_event_t *ev = event;
ev->response_type = XCB_CLIENT_MESSAGE;
ev->window = window;
ev->type = A_WM_PROTOCOLS;
ev->format = 32;
ev->data.data32[0] = A_WM_TAKE_FOCUS;
ev->data.data32[1] = XCB_CURRENT_TIME;
DLOG("Sending WM_TAKE_FOCUS to the client\n");
xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
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free(event);
}
/*
* Finds out which modifier mask is the one for numlock, as the user may change this.
*
*/
void xcb_get_numlock_mask(xcb_connection_t *conn) {
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xcb_key_symbols_t *keysyms;
xcb_get_modifier_mapping_cookie_t cookie;
xcb_get_modifier_mapping_reply_t *reply;
xcb_keycode_t *modmap;
int mask, i;
const int masks[8] = { XCB_MOD_MASK_SHIFT,
XCB_MOD_MASK_LOCK,
XCB_MOD_MASK_CONTROL,
XCB_MOD_MASK_1,
XCB_MOD_MASK_2,
XCB_MOD_MASK_3,
XCB_MOD_MASK_4,
XCB_MOD_MASK_5 };
/* Request the modifier map */
cookie = xcb_get_modifier_mapping(conn);
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/* Get the keysymbols */
keysyms = xcb_key_symbols_alloc(conn);
if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) {
xcb_key_symbols_free(keysyms);
return;
}
modmap = xcb_get_modifier_mapping_keycodes(reply);
/* Get the keycode for numlock */
#ifdef OLD_XCB_KEYSYMS_API
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xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
#else
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/* For now, we only use the first keysymbol. */
xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
if (numlock_syms == NULL)
return;
xcb_keycode_t numlock = *numlock_syms;
free(numlock_syms);
#endif
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/* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */
for (mask = 0; mask < 8; mask++)
for (i = 0; i < reply->keycodes_per_modifier; i++)
if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock)
xcb_numlock_mask = masks[mask];
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xcb_key_symbols_free(keysyms);
free(reply);
}
/*
* Raises the given window (typically client->frame) above all other windows
*
*/
void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) {
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uint32_t values[] = { XCB_STACK_MODE_ABOVE };
xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values);
}
/*
* Query the width of the given text (16-bit characters, UCS) with given real
* length (amount of glyphs) using the given font.
*
*/
int predict_text_width(char *text, int length) {
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xcb_query_text_extents_cookie_t cookie;
xcb_query_text_extents_reply_t *reply;
xcb_generic_error_t *error;
int width;
cookie = xcb_query_text_extents(conn, config.font.id, length, (xcb_char2b_t*)text);
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if ((reply = xcb_query_text_extents_reply(conn, cookie, &error)) == NULL) {
ELOG("Could not get text extents (X error code %d)\n",
error->error_code);
/* We return the rather safe guess of 7 pixels, because a
* rendering error is better than a crash. Plus, the user will
* see the error in his log. */
return 7;
}
width = reply->overall_width;
free(reply);
return width;
}
/*
* Configures the given window to have the size/position specified by given rect
*
*/
void xcb_set_window_rect(xcb_connection_t *conn, xcb_window_t window, Rect r) {
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xcb_void_cookie_t cookie;
cookie = xcb_configure_window(conn, window,
XCB_CONFIG_WINDOW_X |
XCB_CONFIG_WINDOW_Y |
XCB_CONFIG_WINDOW_WIDTH |
XCB_CONFIG_WINDOW_HEIGHT,
&(r.x));
/* ignore events which are generated because we configured a window */
add_ignore_event(cookie.sequence, -1);
}
/*
* Returns true if the given reply contains the given atom.
*
*/
bool xcb_reply_contains_atom(xcb_get_property_reply_t *prop, xcb_atom_t atom) {
if (prop == NULL || xcb_get_property_value_length(prop) == 0)
return false;
xcb_atom_t *atoms;
if ((atoms = xcb_get_property_value(prop)) == NULL)
return false;
for (int i = 0; i < xcb_get_property_value_length(prop) / (prop->format / 8); i++)
if (atoms[i] == atom)
return true;
return false;
}
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/**
* Moves the mouse pointer into the middle of rect.
*
*/
void xcb_warp_pointer_rect(xcb_connection_t *conn, Rect *rect) {
int mid_x = rect->x + (rect->width / 2);
int mid_y = rect->y + (rect->height / 2);
LOG("warp pointer to: %d %d\n", mid_x, mid_y);
xcb_warp_pointer(conn, XCB_NONE, root, 0, 0, 0, 0, mid_x, mid_y);
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}