From 6fe6a9826b376aa85212b9174e8b54f29b86763e Mon Sep 17 00:00:00 2001
From: John Hawthorn <jhawthor@uvic.ca>
Date: Tue, 17 Jun 2008 22:58:24 -0700
Subject: forgot to add file

---
 src/xlib.c | 179 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)
 create mode 100644 src/xlib.c

diff --git a/src/xlib.c b/src/xlib.c
new file mode 100644
index 0000000..e781835
--- /dev/null
+++ b/src/xlib.c
@@ -0,0 +1,179 @@
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/keysym.h>
+
+#include "meh.h"
+
+/* Globals */
+Display *display;
+int screen;
+Window window;
+GC gc;
+
+static unsigned int getshift(unsigned int mask){
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+	return __builtin_ctz(mask);
+#else
+	int i = 0;
+	while((mask & 1) == 0){
+		i++;
+		mask >>= 1;
+	}
+	return i;
+#endif
+}
+
+XImage *ximage(struct image *img, int width, int height) {
+	int depth;
+	XImage *ximg = NULL;
+	Visual *vis;
+	unsigned int rshift, gshift, bshift;
+	int i;
+	int x,y;
+
+	depth = DefaultDepth(display, screen);
+	vis = DefaultVisual(display, screen);
+
+	rshift = getshift(vis->red_mask);
+	gshift = getshift(vis->green_mask);
+	bshift = getshift(vis->blue_mask);
+
+	if (depth >= 24) {
+		unsigned int dx;
+		size_t numNewBufBytes = (4 * width * height);
+		u_int32_t *newBuf = malloc(numNewBufBytes);
+	
+		dx = 1024 * img->width / width;
+		for(y = 0; y < height; y++){
+			i = (y * img->height / height * img->width) * 1024;
+			for(x = 0; x < width; x++){
+				unsigned int r, g, b;
+				r = (img->buf[(i >> 10)*3] << rshift) & vis->red_mask;
+				g = (img->buf[(i >> 10)*3+1] << gshift) & vis->green_mask;
+				b = (img->buf[(i >> 10)*3+2] << bshift) & vis->blue_mask;
+				
+				newBuf[y * width + x] = r | g | b;
+				i += dx;
+			}
+		}
+
+		ximg = XCreateImage (display, 
+			CopyFromParent, depth, 
+			ZPixmap, 0, 
+			(char *) newBuf,
+			width, height,
+			32, 0
+		);
+	}else if(depth >= 15){
+		unsigned int dx;
+		size_t numNewBufBytes = (2 * width * height);
+		u_int16_t *newBuf = malloc (numNewBufBytes);
+
+		dx = 1024 * img->width / width;
+		for(y = 0; y < height; y++){
+			i = (y * img->height / height * img->width) * 1024;
+			for(x = 0; x < width; x++){
+				unsigned int r, g, b;
+				r = (img->buf[i++] << rshift) & vis->red_mask;
+				g = (img->buf[i++] << gshift) & vis->green_mask;
+				b = (img->buf[i++] << bshift) & vis->blue_mask;
+				
+				newBuf[y * width + x] = r | g | b;
+				i += dx;
+			}
+		}
+		
+		ximg = XCreateImage(display,
+			CopyFromParent, depth,
+			ZPixmap, 0,
+			(char *) newBuf,
+			width, height,
+			16, 0
+		);
+	}else{
+		fprintf(stderr, "This program does not support displays with a depth less than 15.\n");
+		exit(1);
+		return NULL;				
+	}
+
+	XInitImage(ximg);
+
+	return ximg;
+}
+
+
+void drawimage(struct image *img, int width, int height){
+	static struct image *lastimg = NULL;
+	static int lastwidth = 0, lastheight = 0;
+	static XImage *ximg = NULL;
+	if(img == lastimg && width == lastwidth && height == lastheight){
+	}else{
+		if(ximg)
+			XDestroyImage(ximg);
+		lastwidth = width;
+		lastheight = height;
+		lastimg = img;
+		if(width * img->height > height * img->width){
+			ximg = ximage(img, img->width * height / img->height, height);
+		}else{
+			ximg = ximage(img, width, img->height * width / img->width);
+		}
+	}
+	assert(ximg);
+	{
+		XRectangle rects[2];
+		int yoffset, xoffset;
+		xoffset = (width - ximg->width) / 2;
+		yoffset = (height - ximg->height) / 2;
+		if(xoffset || yoffset){
+			rects[0].x = rects[0].y = 0;
+			if(xoffset){
+				rects[0].width = rects[1].width = xoffset;
+				rects[0].height = rects[1].height = height;
+				rects[1].x = width-xoffset;
+				rects[1].y = 0;
+			}else if(yoffset){
+				rects[0].width = rects[1].width = width;
+				rects[0].height = rects[1].height = yoffset;
+				rects[1].x = 0;
+				rects[1].y = height - yoffset;
+			}
+			XFillRectangles(display, window, gc, rects, 2);
+		}
+		XPutImage(display, window, gc, ximg, 0, 0, xoffset, yoffset, ximg->width, ximg->height);
+		XFlush(display);
+	}
+}
+
+
+void setaspect(int w, int h){
+	XSizeHints *hints = XAllocSizeHints();
+	hints->flags = PAspect;
+	hints->min_aspect.x = hints->max_aspect.x = w;
+	hints->min_aspect.y = hints->max_aspect.y = h;
+	XSetWMNormalHints(display, window, hints);
+	XFlush(display);
+	XFree(hints);
+}
+
+void xinit(){
+	display = XOpenDisplay (NULL);
+	assert(display);
+	screen = DefaultScreen(display);
+
+	window = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 640, 480, 0, DefaultDepth(display, screen), InputOutput, CopyFromParent, 0, NULL);
+	setaspect(1, 1);
+	gc = XCreateGC(display, window, 0, NULL);
+
+	XMapRaised(display, window);
+	XSelectInput(display, window, StructureNotifyMask | ExposureMask | KeyPressMask);
+	XFlush(display);
+}
+
+
+
-- 
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