add -s/--scaled option to scale the image on all available screens

i3lock.1

@@ -83,6 +83,11 @@ format: rrggbb (i.e. ff0000 is red).
 If an image is specified (via \-i) it will display the image tiled all over the screen
 (if it is a multi-monitor setup, the image is visible on all screens).
 
+.TP
+.B \-s, \-\-scaled
+If an image is specified (via \-i) it will display the image scaled on each
+available screen.
+
 .TP
 .BI \-p\  win|default \fR,\ \fB\-\-pointer= win|default
 If you specify "default",

i3lock.c

@@ -76,6 +76,7 @@ static uint8_t xkb_base_error;
 
 cairo_surface_t *img = NULL;
 bool tile = false;
+bool scaled = false;
 bool ignore_empty_password = false;
 bool skip_repeated_empty_password = false;
 
@@ -780,6 +781,7 @@ int main(int argc, char *argv[]) {
         {"no-unlock-indicator", no_argument, NULL, 'u'},
         {"image", required_argument, NULL, 'i'},
         {"tiling", no_argument, NULL, 't'},
+        {"scaled", no_argument, NULL, 's'},
         {"ignore-empty-password", no_argument, NULL, 'e'},
         {"inactivity-timeout", required_argument, NULL, 'I'},
         {"show-failed-attempts", no_argument, NULL, 'f'},
@@ -790,7 +792,7 @@ int main(int argc, char *argv[]) {
     if ((username = pw->pw_name) == NULL)
         errx(EXIT_FAILURE, "pw->pw_name is NULL.\n");
 
-    char *optstring = "hvnbdc:p:ui:teI:f";
+    char *optstring = "hvnbdc:p:ui:teI:fs";
     while ((o = getopt_long(argc, argv, optstring, longopts, &optind)) != -1) {
         switch (o) {
             case 'v':
@@ -828,6 +830,15 @@ int main(int argc, char *argv[]) {
                 break;
             case 't':
                 tile = true;
+                if (scaled) {
+                    errx(EXIT_FAILURE, "the tile and scaled option can not be used at the same time\n");
+                }
+                break;
+            case 's':
+                scaled = true;
+                if (tile) {
+                    errx(EXIT_FAILURE, "the tile and scaled option can not be used at the same time\n");
+                }
                 break;
             case 'p':
                 if (!strcmp(optarg, "win")) {

unlock_indicator.c

@@ -53,6 +53,8 @@ extern cairo_surface_t *img;
 
 /* Whether the image should be tiled. */
 extern bool tile;
+/* Whether the image should be scaled per screen. */
+extern bool scaled;
 /* The background color to use (in hex). */
 extern char color[7];
 
@@ -116,8 +118,27 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
 
     if (img) {
         if (!tile) {
-            cairo_set_source_surface(xcb_ctx, img, 0, 0);
-            cairo_paint(xcb_ctx);
+            if (xr_screens > 0 && scaled) {
+                for (int screen = 0; screen < xr_screens; screen++) {
+                    double w, h, scale_x, scale_y;
+                    cairo_save(xcb_ctx);
+                    w = cairo_image_surface_get_width(img);
+                    h = cairo_image_surface_get_height(img);
+                    scale_x = ((double)xr_resolutions[screen].width / w);
+                    scale_y = ((double)xr_resolutions[screen].height / h);
+                    cairo_scale(xcb_ctx,
+                                scale_x,
+                                scale_y);
+                    cairo_set_source_surface(xcb_ctx, img,
+                                             xr_resolutions[screen].x / scale_x,
+                                             xr_resolutions[screen].y / scale_y);
+                    cairo_paint(xcb_ctx);
+                    cairo_restore(xcb_ctx);
+                }
+            } else {
+                cairo_set_source_surface(xcb_ctx, img, 0, 0);
+                cairo_paint(xcb_ctx);
+            }
         } else {
             /* create a pattern and fill a rectangle as big as the screen */
             cairo_pattern_t *pattern;