Adding background image patch

patch/background_image_x.c

@@ -0,0 +1,104 @@
+void
+updatexy()
+{
+	Window child;
+	XTranslateCoordinates(xw.dpy, xw.win, DefaultRootWindow(xw.dpy), 0, 0, &win.x, &win.y, &child);
+}
+
+/*
+ * load farbfeld file to XImage
+ */
+XImage*
+loadff(const char *filename)
+{
+	uint32_t i, hdr[4], w, h, size;
+	uint64_t *data;
+	FILE *f = fopen(filename, "rb");
+
+	if (f == NULL) {
+		 fprintf(stderr, "could not load background image.\n");
+		 return NULL;
+	}
+
+	if (fread(hdr, sizeof(*hdr), LEN(hdr), f) != LEN(hdr))
+		 if (ferror(f)) {
+			  fprintf(stderr, "fread:");
+			  return NULL;
+		 }
+		 else {
+			  fprintf(stderr, "fread: Unexpected end of file\n");
+			  return NULL;
+		 }
+
+	if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
+		 fprintf(stderr, "Invalid magic value");
+		 return NULL;
+	}
+
+	w = ntohl(hdr[2]);
+	h = ntohl(hdr[3]);
+	size = w * h;
+	data = malloc(size * sizeof(uint64_t));
+
+	if (fread(data, sizeof(uint64_t), size, f) != size)
+		 if (ferror(f)) {
+			  fprintf(stderr, "fread:");
+			  return NULL;
+		 }
+		 else {
+			  fprintf(stderr, "fread: Unexpected end of file");
+			  return NULL;
+		 }
+
+	fclose(f);
+
+	for (i = 0; i < size; i++)
+		 data[i] = (data[i] & 0x00000000000000FF) << 16 |
+		           (data[i] & 0x0000000000FF0000) >> 8  |
+		           (data[i] & 0x000000FF00000000) >> 32 |
+		           (data[i] & 0x00FF000000000000) >> 24;
+
+	#if ALPHA_PATCH
+	XImage *xi = XCreateImage(xw.dpy, xw.vis, xw.depth, ZPixmap, 0,
+		(char *)data, w, h, 32, w * 8);
+	#else
+	XImage *xi = XCreateImage(xw.dpy, DefaultVisual(xw.dpy, xw.scr),
+		DefaultDepth(xw.dpy, xw.scr), ZPixmap, 0,
+		(char *)data, w, h, 32, w * 8);
+	#endif // ALPHA_PATCH
+	xi->bits_per_pixel = 64;
+	return xi;
+}
+
+/*
+ * initialize background image
+ */
+void
+bginit()
+{
+	XGCValues gcvalues;
+	Drawable bgimg;
+	XImage *bgxi = loadff(bgfile);
+
+	memset(&gcvalues, 0, sizeof(gcvalues));
+	xw.bggc = XCreateGC(xw.dpy, xw.win, 0, &gcvalues);
+	if (!bgxi)
+		return;
+	#if ALPHA_PATCH
+	bgimg = XCreatePixmap(xw.dpy, xw.win, bgxi->width, bgxi->height,
+		xw.depth);
+	#else
+	bgimg = XCreatePixmap(xw.dpy, xw.win, bgxi->width, bgxi->height,
+		DefaultDepth(xw.dpy, xw.scr));
+	#endif // ALPHA_PATCH
+	XPutImage(xw.dpy, bgimg, dc.gc, bgxi, 0, 0, 0, 0, bgxi->width,
+				 bgxi->height);
+	XDestroyImage(bgxi);
+	XSetTile(xw.dpy, xw.bggc, bgimg);
+	XSetFillStyle(xw.dpy, xw.bggc, FillTiled);
+	if (pseudotransparency) {
+		updatexy();
+		MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
+		XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
+	}
+}

patch/background_image_x.h

@@ -0,0 +1,5 @@
+#include <arpa/inet.h>
+
+static void updatexy(void);
+static XImage *loadff(const char *);
+static void bginit();

patch/x_include.c

@@ -1,4 +1,7 @@
 /* Patches */
+#if BACKGROUND_IMAGE_PATCH
+#include "background_image_x.c"
+#endif
 #if BOXDRAW_PATCH
 #include "boxdraw.c"
 #endif

patch/x_include.h

@@ -1,4 +1,7 @@
 /* Patches */
+#if BACKGROUND_IMAGE_PATCH
+#include "background_image_x.h"
+#endif
 #if BOXDRAW_PATCH
 #include "boxdraw.h"
 #endif