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Use 32-bit visual by default if available.

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With this patch, we use 32-bit visuals per default whenever it is
available. Otherwise, we fall back to the actual root window's
depth, which will typically be 24-bit.

Before this patch, we already used 32-bit depth for containers with
a window that uses 32-bit. However, this means that we didn't use
32-bit for split parent containers on which decoration is drawn.
For 32-bit windows using transparency, this caused a graphical glitch
because the decoration pixmap behind it would show through. This
behavior is fixed with this change.

relates to #1278
This commit is contained in:
Ingo Bürk
2015-11-17 12:50:06 +01:00
parent d2126027ce
commit 780cb8d15d
7 changed files with 77 additions and 49 deletions
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28
src/main.c
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@ -59,7 +59,6 @@ xcb_window_t root;
* pixmaps. Will use 32 bit depth and an appropriate visual, if available,
* otherwise the root window’s default (usually 24 bit TrueColor). */
uint8_t root_depth;
xcb_visualid_t visual_id;
xcb_visualtype_t *visual_type;
xcb_colormap_t colormap;
@ -482,16 +481,29 @@ int main(int argc, char *argv[]) {
#include "atoms.xmacro"
#undef xmacro
/* By default, we use the same depth and visual as the root window, which
* usually is TrueColor (24 bit depth) and the corresponding visual.
* However, we also check if a 32 bit depth and visual are available (for
* transparency) and use it if so. */
root_depth = root_screen->root_depth;
visual_id = root_screen->root_visual;
visual_type = get_visualtype(root_screen);
colormap = root_screen->default_colormap;
visual_type = xcb_aux_find_visual_by_attrs(root_screen, -1, 32);
if (visual_type != NULL) {
root_depth = xcb_aux_get_depth_of_visual(root_screen, visual_type->visual_id);
colormap = xcb_generate_id(conn);
DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
xcb_void_cookie_t cm_cookie = xcb_create_colormap_checked(conn,
XCB_COLORMAP_ALLOC_NONE,
colormap,
root,
visual_type->visual_id);
xcb_generic_error_t *error = xcb_request_check(conn, cm_cookie);
if (error != NULL) {
ELOG("Could not create colormap. Error code: %d\n", error->error_code);
exit(EXIT_FAILURE);
}
} else {
visual_type = get_visualtype(root_screen);
}
DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_type->visual_id);
DLOG("root_screen->height_in_pixels = %d, root_screen->height_in_millimeters = %d, dpi = %d\n",
root_screen->height_in_pixels, root_screen->height_in_millimeters,
(int)((double)root_screen->height_in_pixels * 25.4 / (double)root_screen->height_in_millimeters));