b9b1a60b5d
Commit 287a0b4 introduced a segfault when validating the i3 config
as the root_screen will not be set in this case, causing a null
pointer dereference.
fixes #2144
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
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*
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include "queue.h"
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#include "libi3.h"
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struct Colorpixel {
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char *hex;
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uint32_t pixel;
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SLIST_ENTRY(Colorpixel)
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colorpixels;
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};
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SLIST_HEAD(colorpixel_head, Colorpixel)
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colorpixels;
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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(const char *hex) {
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char strgroups[3][3] = {
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{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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uint8_t r = strtol(strgroups[0], NULL, 16);
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uint8_t g = strtol(strgroups[1], NULL, 16);
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uint8_t b = strtol(strgroups[2], NULL, 16);
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/* Shortcut: if our screen is true color, no need to do a roundtrip to X11 */
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if (root_screen == NULL || root_screen->root_depth == 24 || root_screen->root_depth == 32) {
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return (0xFF << 24) | (r << 16 | g << 8 | b);
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}
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/* Lookup this colorpixel in the cache */
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struct Colorpixel *colorpixel;
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SLIST_FOREACH(colorpixel, &(colorpixels), colorpixels) {
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if (strcmp(colorpixel->hex, hex) == 0)
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return colorpixel->pixel;
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}
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#define RGB_8_TO_16(i) (65535 * ((i)&0xFF) / 255)
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int r16 = RGB_8_TO_16(r);
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int g16 = RGB_8_TO_16(g);
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int b16 = RGB_8_TO_16(b);
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xcb_alloc_color_reply_t *reply;
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reply = xcb_alloc_color_reply(conn, xcb_alloc_color(conn, root_screen->default_colormap,
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r16, g16, b16),
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NULL);
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if (!reply) {
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LOG("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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/* Store the result in the cache */
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struct Colorpixel *cache_pixel = scalloc(1, 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(&(colorpixels), cache_pixel, colorpixels);
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return pixel;
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}
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