123 lines
4.7 KiB
C
123 lines
4.7 KiB
C
/*
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* vim:ts=8:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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*
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* © 2009 Michael Stapelberg and contributors
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*
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* See file LICENSE for license information.
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*
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* xcb.c: Helper functions for easier usage of XCB
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <xcb/xcb.h>
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#include "util.h"
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/*
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* Returns the colorpixel to use for the given hex color (think of HTML).
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*
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* The hex_color has to start with #, for example #FF00FF.
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*
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* The client argument is optional. If it is given, the colorpixel will be cached.
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*
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* NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
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* This has to be done by the caller.
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*
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*/
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uint32_t get_colorpixel(xcb_connection_t *conn, Client *client, xcb_window_t window, char *hex) {
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/* Lookup this colorpixel in the cache if a client was specified */
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if (client != NULL) {
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struct Colorpixel *pixel;
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SLIST_FOREACH(pixel, &(client->colorpixels), colorpixels)
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if (strcmp(pixel->hex, hex) == 0)
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return pixel->pixel;
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}
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#define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
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char strgroups[3][3] = {{hex[1], hex[2], '\0'},
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{hex[3], hex[4], '\0'},
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{hex[5], hex[6], '\0'}};
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int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
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RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
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RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
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xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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xcb_colormap_t colormap_id = xcb_generate_id(conn);
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xcb_void_cookie_t cookie = xcb_create_colormap_checked(conn, XCB_COLORMAP_ALLOC_NONE,
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colormap_id, window, root_screen->root_visual);
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check_error(conn, cookie, "Could not create colormap");
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xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(conn,
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xcb_alloc_color(conn, colormap_id, rgb16[0], rgb16[1], rgb16[2]), NULL);
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if (!reply) {
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printf("Could not allocate color\n");
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exit(1);
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}
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uint32_t pixel = reply->pixel;
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free(reply);
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xcb_free_colormap(conn, colormap_id);
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/* Store the result in the cache if a client was specified */
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if (client != NULL) {
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struct Colorpixel *cache_pixel = scalloc(sizeof(struct Colorpixel));
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cache_pixel->hex = sstrdup(hex);
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cache_pixel->pixel = pixel;
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SLIST_INSERT_HEAD(&(client->colorpixels), cache_pixel, colorpixels);
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}
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return pixel;
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}
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xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, uint32_t mask, uint32_t *values) {
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xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
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xcb_window_t result = xcb_generate_id(conn);
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xcb_void_cookie_t cookie;
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/* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
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uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
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cookie = xcb_create_window_checked(conn,
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depth,
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result, /* the window id */
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root, /* parent == root */
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dims.x, dims.y, dims.width, dims.height, /* dimensions */
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0, /* border = 0, we draw our own */
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window_class,
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XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
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mask,
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values);
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check_error(conn, cookie, "Could not create window");
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/* Map the window (= make it visible) */
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xcb_map_window(conn, result);
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return result;
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}
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/*
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* Changes a single value in the graphic context (so one doesn’t have to define an array of values)
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*
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*/
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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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}
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/*
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* Draws a line from x,y to to_x,to_y using the given color
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*
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*/
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void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
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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);
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xcb_point_t points[] = {{x, y}, {to_x, to_y}};
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xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
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}
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