win32

commit 82d0689a7959e25611d5dfcc0d894e4fdb231212
parent 47ae560e0671f0ceb3aeec8ded95c76db6374596
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Wed, 17 Dec 2025 12:58:17 +0900

allocate picture

Diffstat:
M
Makefile
 | 
2
+-
M
win32.c
 | 
66
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----

2 files changed, 63 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,5 +1,5 @@
 all:
-	$(CC) -Wall -Wpedantic -Wextra -I/usr/X11R6/include win32.c -L/usr/X11R6/lib -lX11 -o win32
+	$(CC) -Wall -Wpedantic -Wextra -I/usr/X11R6/include win32.c -L/usr/X11R6/lib -lX11 -lXrender -o win32
 
 clean:
 	rm -f win32
diff --git a/win32.c b/win32.c
@@ -2,9 +2,11 @@
 #include <stdlib.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
+#include <X11/extensions/Xrender.h>
 
 void fatal(char *msg);
 int findVisual32(Display *display, XVisualInfo *return_visual_info);
+int findPictFormat(Display *display, int depth, XRenderPictFormat *return_pictformat);
 
 int main(void) {
 	Display *display = XOpenDisplay(NULL);
@@ -25,13 +27,34 @@ int main(void) {
 		&attr);
 	XMapWindow(display, window);
 
+	XRenderPictFormat pictformat, pictformat24, pictformat32;
+	if (findPictFormat(display, 24, &pictformat24) < 0) {
+		fatal("24bit-deep pictformat not found");
+	}
+	if (findPictFormat(display, 32, &pictformat32) < 0) {
+		fatal("32bit-deep pictformat not found");
+	}
+	switch (DefaultDepth(display, screen)) {
+	case 24:
+		pictformat = pictformat24;
+		break;
+	case 32:
+		pictformat = pictformat32;
+		break;
+	default:
+		fatal("unsupported screen depth");
+	}
+
+	Picture picture = XRenderCreatePicture(display, window, &pictformat, 0, NULL);
+	XRenderColor color = { .red = 0xffff, .green = 0xffff, .blue = 0xeaea, .alpha = 0xffff };
+	XRectangle rectangle = { .x = 0, .y = 0, .width = 800, .height = 600 };
+
+/*
 	XVisualInfo vi32;
 	if (findVisual32(display, &vi32) < 0) {
 		fatal("32bit-deep visual info not found");
 	}
-
 	Colormap colormap32 = XCreateColormap(display, DefaultRootWindow(display), vi32.visual, AllocNone);
-
 	XSetWindowAttributes attr32 = {
 		.border_pixel = 0,
 		.colormap = colormap32,
@@ -43,8 +66,8 @@ int main(void) {
 		vi32.visual,
 		CWBorderPixel|CWColormap,
 		&attr32);
-
-	XSync(display, window);
+*/	
+	XSync(display, 0);
 	int quit = 0;
 	XEvent event;
 	while (!quit) {
@@ -52,6 +75,7 @@ int main(void) {
 		if (event.type == KeyPress && event.xkey.keycode == 49) {
 			quit = 1;
 		}
+		XRenderFillRectangles(display, PictOpSrc, picture, &color, &rectangle, 1);
 	}
 
 	XCloseDisplay(display);
@@ -79,3 +103,37 @@ int findVisual32(Display *display, XVisualInfo *return_visual_info) {
 	XFree(vinfos);
 	return 0;
 }
+
+XRenderDirectFormat directformat24 = {
+	.red = 16,
+	.redMask = 0xff,
+	.green = 8,
+	.greenMask = 0xff,
+	.blue = 0,
+	.blueMask = 0xff,
+};
+
+XRenderDirectFormat directformat32 = {
+	.alpha = 24,
+	.alphaMask = 0xff,
+	.red = 16,
+	.redMask = 0xff,
+	.green = 8,
+	.greenMask = 0xff,
+	.blue = 0,
+	.blueMask = 0xff,
+};
+
+int findPictFormat(Display *display, int depth, XRenderPictFormat *return_pictformat) {
+	long mask = PictFormatType | PictFormatDepth;
+	XRenderPictFormat template = {
+		.type = PictTypeDirect,
+		.depth = depth,
+	};
+	XRenderPictFormat *f = XRenderFindFormat(display, mask, &template, 0);
+	if (!f) {
+		return -1;
+	}
+	*return_pictformat = *f;
+	return 0;
+}