win32

commit 355f19114ce3c7f696618cf6142560571884305c
parent 84cdd1cd5529c9ebfb073f1b561550e92d32a73b
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Thu, 18 Dec 2025 22:16:17 +0900

find pictformats

Diffstat:
M
Makefile
 | 
2
+-
M
xcb.c
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -4,7 +4,7 @@ xlib: xlib.c
 	$(CC) -Wall -Wpedantic -Wextra -I/usr/X11R6/include xlib.c -L/usr/X11R6/lib -lX11 -lXrender -o xlib
 
 xcb: xcb.c
-	$(CC) -Wall -Wpedantic -Wextra -I/usr/X11R6/include xcb.c -L/usr/X11R6/lib -lxcb -o xcb
+	$(CC) -Wall -Wpedantic -Wextra -I/usr/X11R6/include xcb.c -L/usr/X11R6/lib -lxcb -lxcb-render -o xcb
 
 clean:
 	rm -f xlib xcb
diff --git a/xcb.c b/xcb.c
@@ -3,8 +3,10 @@
 #include <unistd.h> // for pause(void)
 #include <xcb/xcb.h>
 #include <xcb/xproto.h>
+#include <xcb/render.h>
 
 void fatal(char *msg);
+int findPictFormat(xcb_connection_t *conn, int dept, xcb_render_pictformat_t *return_pictformat);
 
 int main(void) {
 	xcb_connection_t *conn = xcb_connect(NULL, NULL);
@@ -23,6 +25,21 @@ int main(void) {
 		XCB_CW_EVENT_MASK, &attr);
 	xcb_map_window(conn, window);
 
+	xcb_render_pictformat_t pictformat, pictformat24, pictformat32;
+	if (findPictFormat(conn, 32, &pictformat32) < 0) {
+		fatal("32bit pictformat not found");
+	}
+	if (findPictFormat(conn, 24, &pictformat24) < 0) {
+		fatal("24bit pictformat not found");
+	}
+	if (screen->root_depth == 32) {
+		pictformat = pictformat32;
+	} else if (screen->root_depth == 24) {
+		pictformat = pictformat24;
+	} else {
+		fatal("unsupported depth");
+	}
+
 	xcb_flush(conn);
 
 	pause();
@@ -35,3 +52,32 @@ void fatal(char *msg) {
 	fprintf(stderr, "%s\n", msg);
 	exit(1);
 }
+
+int findPictFormat(xcb_connection_t *conn, int depth, xcb_render_pictformat_t *return_pictformat) {
+	xcb_generic_error_t *error;
+	xcb_render_query_pict_formats_cookie_t cookie = xcb_render_query_pict_formats(conn);
+	xcb_render_query_pict_formats_reply_t *reply = xcb_render_query_pict_formats_reply(conn, cookie, &error);
+	if (error != NULL) {
+		fatal("render_query_pict_formats");
+	}
+	xcb_render_pictforminfo_iterator_t iter = xcb_render_query_pict_formats_formats_iterator(reply);
+	while (iter.rem > 0) {
+		if (depth == 24 && iter.data->type == XCB_RENDER_PICT_TYPE_DIRECT && iter.data->depth == 24 && 
+			iter.data->direct.red_shift == 16 && iter.data->direct.red_mask == 0xff &&
+			iter.data->direct.green_shift == 8 && iter.data->direct.green_mask == 0xff &&
+			iter.data->direct.blue_shift == 0 && iter.data->direct.blue_mask == 0xff) {
+			*return_pictformat = iter.data->id;
+			return 0;
+		}
+		if (depth == 32 && iter.data->type == XCB_RENDER_PICT_TYPE_DIRECT && iter.data->depth == 32 && 
+			iter.data->direct.alpha_shift == 24 && iter.data->direct.alpha_mask == 0xff &&
+			iter.data->direct.red_shift == 16 && iter.data->direct.red_mask == 0xff &&
+			iter.data->direct.green_shift == 8 && iter.data->direct.green_mask == 0xff &&
+			iter.data->direct.blue_shift == 0 && iter.data->direct.blue_mask == 0xff) {
+			*return_pictformat = iter.data->id;
+			return 0;
+		}
+		xcb_render_pictforminfo_next(&iter);
+	}
+	return -1;
+}