No more expose handling

image.c

@@ -31,7 +31,6 @@ void imlib_init(win_t *win) {
 	imlib_context_set_display(win->env.dpy);
 	imlib_context_set_visual(win->env.vis);
 	imlib_context_set_colormap(win->env.cmap);
-	imlib_context_set_drawable(win->xwin);
 }
 
 void imlib_destroy() {
@@ -86,43 +85,43 @@ void img_display(img_t *img, win_t *win) {
 	img->x = (win->w - img->w * img->zoom) / 2;
 	img->y = (win->h - img->h * img->zoom) / 2;
 
-	win_clear(win);
-
-	img_render(img, win, 0, 0, win->w, win->h);
+	img_render(img, win);
 }
 
-void img_render(img_t *img, win_t *win, int x, int y, int w, int h) {
+void img_render(img_t *img, win_t *win) {
 	int sx, sy, sw, sh;
 	int dx, dy, dw, dh;
 
 	if (!img || !win || !imlib_context_get_image())
 		return;
 
-	if (img->x < x) {
-		sx = (x - img->x) / img->zoom;
-		sw = MIN(w / img->zoom, img->w - sx);
-		dx = x;
-		dw = sw * img->zoom;
+	if (img->x < 0) {
+		sx = -img->x / img->zoom;
+		sw = win->w / img->zoom;
+		dx = 0;
+		dw = win->w;
 	} else {
 		sx = 0;
-		sw = MIN((w - img->x + x) / img->zoom, img->w);
+		sw = img->w;
 		dx = img->x;
-		dw = sw * img->zoom;
+		dw = img->w * img->zoom;
 	}
-	if (img->y < y) {
-		sy = (y - img->y) / img->zoom;
-		sh = MIN(h / img->zoom, img->h - sy);
-		dy = y;
-		dh = sh * img->zoom;
+	if (img->y < 0) {
+		sy = -img->y / img->zoom;
+		sh = win->h / img->zoom;
+		dy = 0;
+		dh = win->h;
 	} else {
 		sy = 0;
-		sh = MIN((h - img->y + y) / img->zoom, img->h);
+		sh = img->h;
 		dy = img->y;
-		dh = sh * img->zoom;
+		dh = img->h * img->zoom;
 	}
 
-	if (sw < 0 || sh < 0)
-		return;
+	win_clear(win);
 
+	imlib_context_set_drawable(win->pm);
 	imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
+
+	win_draw(win);
 }

image.h

@@ -41,6 +41,6 @@ void imlib_destroy();
 
 int img_load(img_t*, const char*);
 void img_display(img_t*, win_t*);
-void img_render(img_t*, win_t*, int, int, int, int);
+void img_render(img_t*, win_t*);
 
 #endif /* IMAGE_H */

main.c

@@ -29,14 +29,12 @@
 
 void on_keypress(XEvent*);
 void on_configurenotify(XEvent*);
-void on_expose(XEvent*);
 
 void update_title();
 
 static void (*handler[LASTEvent])(XEvent*) = {
-	[Expose] = on_expose,
-	[ConfigureNotify] = on_configurenotify,
-	[KeyPress] = on_keypress
+	[KeyPress] = on_keypress,
+	[ConfigureNotify] = on_configurenotify
 };
 
 img_t img;
@@ -154,14 +152,6 @@ void on_configurenotify(XEvent *ev) {
 	win_configure(&win, &ev->xconfigure);
 }
 
-void on_expose(XEvent *ev) {
-	if (!ev)
-		return;
-
-	img_render(&img, &win, ev->xexpose.x, ev->xexpose.y,
-	           ev->xexpose.width, ev->xexpose.height);
-}
-
 void update_title() {
 	int n;
 

window.c

@@ -28,8 +28,7 @@ void win_open(win_t *win) {
 	win_env_t *e;
 	XClassHint *classhint;
 	XColor bgcol;
-	XSetWindowAttributes attr;
-	unsigned long mask;
+	XGCValues gcval;
 
 	if (!win)
 		return;
@@ -58,19 +57,19 @@ void win_open(win_t *win) {
 	win->x = (e->scrw - win->w) / 2;
 	win->y = (e->scrh - win->h) / 2;
 
-	attr.backing_store = NotUseful;
-	attr.background_pixel = bgcol.pixel;
-	attr.save_under = False;
-	mask = CWBackingStore | CWBackPixel | CWSaveUnder;
-
 	win->xwin = XCreateWindow(e->dpy, RootWindow(e->dpy, e->scr),
 	                          win->x, win->y, win->w, win->h, 0,
-	                          e->depth, InputOutput, e->vis, mask, &attr);
+	                          e->depth, InputOutput, e->vis, 0, None);
 	if (win->xwin == None)
 		DIE("could not create window");
 
 	XSelectInput(e->dpy, win->xwin,
-	             StructureNotifyMask | ExposureMask | KeyPressMask);
+	             StructureNotifyMask | KeyPressMask);
+
+	win->pm = 0;
+
+	gcval.foreground = bgcol.pixel;
+	win->bgc = XCreateGC(e->dpy, win->xwin, GCForeground, &gcval);
 
 	win_set_title(win, "sxiv");
 
@@ -124,5 +123,17 @@ void win_clear(win_t *win) {
 	if (!win)
 		return;
 
+	if (win->pm)
+		XFreePixmap(win->env.dpy, win->pm);
+	win->pm = XCreatePixmap(win->env.dpy, win->xwin, win->w, win->h,
+	                        win->env.depth);
+	XFillRectangle(win->env.dpy, win->pm, win->bgc, 0, 0, win->w, win->h);
+}
+
+void win_draw(win_t *win) {
+	if (!win)
+		return;
+
+	XSetWindowBackgroundPixmap(win->env.dpy, win->xwin, win->pm);
 	XClearWindow(win->env.dpy, win->xwin);
 }

window.h

@@ -33,6 +33,8 @@ typedef struct win_env_s {
 typedef struct win_s {
 	Window xwin;
 	win_env_t env;
+	Pixmap pm;
+	GC bgc;
 
 	int w;
 	int h;
@@ -49,6 +51,8 @@ void win_close(win_t*);
 void win_set_title(win_t*, const char*);
 
 int win_configure(win_t*, XConfigureEvent*);
+
 void win_clear(win_t*);
+void win_draw(win_t*);
 
 #endif /* WINDOW_H */