Render image on window

1 files changed, 58 insertions, 3 deletions

diff --git a/image.c b/image.c
index a430b81..235b2d4 100644
--- a/image.c
+++ b/image.c
@@ -25,7 +25,7 @@
 void imlib_init(win_t *win) {
 	if (!win)
 		return;
-	
+
 	imlib_context_set_display(win->env.dpy);
 	imlib_context_set_visual(win->env.vis);
 	imlib_context_set_colormap(win->env.cmap);
@@ -41,9 +41,64 @@ void img_load(img_t *img, char *filename) {
 
 	if (!(img->im = imlib_load_image(filename)))
 		DIE("could not open image: %s", filename);
-	
+
 	imlib_context_set_image(img->im);
-	
+
 	img->w = imlib_image_get_width();
 	img->h = imlib_image_get_height();
 }
+
+void img_render(img_t *img, win_t *win) {
+	float zw, zh;
+	unsigned int sx, sy, sw, sh;
+	unsigned int dx, dy, dw, dh;
+
+	if (!img || !win)
+		return;
+
+	/* set zoom level to fit image into window */
+	if (img->scalemode != SCALE_ZOOM) {
+		zw = (float) win->w / (float) img->w;
+		zh = (float) win->h / (float) img->h;
+		img->zoom = MIN(zw, zh);
+
+		if (img->zoom * 100.0 < ZOOM_MIN)
+			img->zoom = ZOOM_MIN / 100.0;
+		else if (img->zoom * 100.0 > ZOOM_MAX)
+			img->zoom = ZOOM_MAX / 100.0;
+
+		if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
+			img->zoom = 1.0;
+	}
+
+	/* center image in window */
+	img->x = (win->w - img->w * img->zoom) / 2;
+	img->y = (win->h - img->h * img->zoom) / 2;
+
+	if (img->x < 0) {
+		sx = -img->x / img->zoom;
+		sw = (img->x + win->w) / img->zoom;
+		dx = 0;
+		dw = win->w;
+	} else {
+		sx = 0;
+		sw = img->w;
+		dx = img->x;
+		dw = img->w * img->zoom;
+	}
+	if (img->y < 0) {
+		sy = -img->y / img->zoom;
+		sh = (img->y + win->h) / img->zoom;
+		dy = 0;
+		dh = win->h;
+	} else {
+		sy = 0;
+		sh = img->h;
+		dy = img->y;
+		dh = img->h * img->zoom;
+	}
+
+	win_clear(win);
+
+	imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
+}