43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <xcb/xcb.h>
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/* All the helper functions needed for efficiently using XCB */
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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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* 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, xcb_window_t window, char *hex) {
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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 colormapId = xcb_generate_id(conn);
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xcb_create_colormap(conn, XCB_COLORMAP_ALLOC_NONE, colormapId, window, root_screen->root_visual);
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xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(conn,
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xcb_alloc_color(conn, colormapId, rgb16[0], rgb16[1], rgb16[2]), NULL);
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if (!reply) {
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printf("color fail\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, colormapId);
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return pixel;
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}
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