win32

commit 184328428e41704305f3af18c664c9ed7bd9fab6
parent c6990309e655802f9c64fedbbdab6cb6e97d0f11
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Wed, 17 Dec 2025 08:32:00 +0900

use 32bit-deep visual to create window, still BadMatch

Diffstat:
M
win32.c
 | 
27
++++++++++++++++++++++++++-

1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/win32.c b/win32.c
@@ -1,8 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <X11/Xlib.h>
+#include <X11/Xutil.h>
 
 void fatal(char *msg);
+int findVisual32(Display *display, int screen, XVisualInfo *return_visual_info);
 
 int main(void) {
 	Display *display = XOpenDisplay(NULL);
@@ -23,11 +25,16 @@ int main(void) {
 		&attr);
 	XMapWindow(display, window);
 
+	XVisualInfo vi32;
+	if (findVisual32(display, screen, &vi32) < 0) {
+		fatal("32bit-deep visual info not found");
+	}
+
 	Window window32 = XCreateWindow(display, DefaultRootWindow(display),
 		0, 0, 1, 1, 0,
 		32,
 		InputOutput,
-		DefaultVisual(display, screen),
+		vi32.visual,
 		0, NULL);
 
 	XSync(display, window);
@@ -47,3 +54,21 @@ void fatal(char *msg) {
 	fprintf(stderr, "%s\n", msg);
 	exit(1);
 }
+
+int findVisual32(Display *display, int screen, XVisualInfo *return_visual_info) {
+	long mask = VisualDepthMask|VisualRedMaskMask|VisualGreenMaskMask|VisualBlueMaskMask;
+	XVisualInfo template = {
+		.depth      = 32,
+		.red_mask   = 0xff0000,
+		.green_mask = 0x00ff00,
+		.blue_mask  = 0x0000ff,
+	};
+	int n;
+	XVisualInfo *vinfos = XGetVisualInfo(display, mask, &template, &n);
+	if (n == 0) {
+		return -1;
+	}
+	*return_visual_info = vinfos[0];
+	XFree(vinfos);
+	return 0;
+}