win32

commit e54909a53f7a6ef17135e60b9809ceb373596d33
parent 355f19114ce3c7f696618cf6142560571884305c
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Fri, 19 Dec 2025 13:07:03 +0900

fill background

Diffstat:
M
xcb.c
 | 
39
++++++++++++++++++++++++++++++++-------

1 file changed, 32 insertions(+), 7 deletions(-)
diff --git a/xcb.c b/xcb.c
@@ -1,11 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h> // for pause(void)
+#include <stdarg.h>
 #include <xcb/xcb.h>
 #include <xcb/xproto.h>
 #include <xcb/render.h>
 
 void fatal(char *msg);
+void fatalf(char *fmt, ...);
 int findPictFormat(xcb_connection_t *conn, int dept, xcb_render_pictformat_t *return_pictformat);
 
 int main(void) {
@@ -15,17 +16,16 @@ int main(void) {
 	}
 	xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 	xcb_window_t window = xcb_generate_id(conn);
-	xcb_create_window_value_list_t attr = {
-		.event_mask = XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_EXPOSURE,
-	};
+	uint32_t attr = XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_EXPOSURE;
+	int width = 800, height = 600;
 	xcb_create_window(conn, XCB_COPY_FROM_PARENT, window, screen->root,
-		0, 0, 800, 600, 0,
+		0, 0, width, height, 0,
 		XCB_WINDOW_CLASS_INPUT_OUTPUT,
 		screen->root_visual,
 		XCB_CW_EVENT_MASK, &attr);
 	xcb_map_window(conn, window);
 
-	xcb_render_pictformat_t pictformat, pictformat24, pictformat32;
+	xcb_render_pictformat_t pictformat = 0, pictformat24, pictformat32;
 	if (findPictFormat(conn, 32, &pictformat32) < 0) {
 		fatal("32bit pictformat not found");
 	}
@@ -40,9 +40,25 @@ int main(void) {
 		fatal("unsupported depth");
 	}
 
+	xcb_render_picture_t picture = xcb_generate_id(conn);
+	xcb_render_create_picture(conn, picture, window, pictformat, 0, NULL);
+	xcb_render_color_t color = { .red = 0xffff, .green = 0xffff, .blue = 0xeaea, .alpha = 0xffff };
+	xcb_rectangle_t rectangle = { .x = 0, .y = 0, .width = width, .height = height };
+	xcb_render_fill_rectangles(conn, XCB_RENDER_PICT_OP_SRC, picture, color, 1, &rectangle);
+
 	xcb_flush(conn);
 
-	pause();
+	int quit = 0;
+	xcb_generic_event_t *event;
+	while (!quit) {
+		xcb_render_fill_rectangles(conn, XCB_RENDER_PICT_OP_SRC, picture, color, 1, &rectangle);
+		xcb_flush(conn);
+
+		event = xcb_wait_for_event(conn);
+		if ((event->response_type & ~0x80) == XCB_KEY_PRESS && ((xcb_key_press_event_t *)event)->detail == 49) {
+			quit = 1;
+		}
+	}
 
 	xcb_disconnect(conn);
 	return 0;
@@ -53,6 +69,15 @@ void fatal(char *msg) {
 	exit(1);
 }
 
+void fatalf(char *fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+	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);