draw the unlock indicator in the middle of every screen

1 files changed, 76 insertions, 51 deletions

diff --git a/unlock_indicator.c b/unlock_indicator.c
index 2d72cf2..bd61881 100644
--- a/unlock_indicator.c
+++ b/unlock_indicator.c
@@ -20,11 +20,12 @@
 
 #include "xcb.h"
 #include "unlock_indicator.h"
+#include "xinerama.h"
 
 #define BUTTON_RADIUS 90
 #define BUTTON_SPACE (BUTTON_RADIUS + 5)
 #define BUTTON_CENTER (BUTTON_RADIUS + 5)
-#define BUTTON_DIAMETER (5 * BUTTON_SPACE)
+#define BUTTON_DIAMETER (2 * BUTTON_SPACE)
 
 /*******************************************************************************
  * Variables defined in i3lock.c.
@@ -79,51 +80,47 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
     if (!vistype)
         vistype = get_root_visual_type(screen);
     bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
-    /* Initialize cairo */
-    cairo_surface_t *output;
-    output = cairo_xcb_surface_create(conn, bg_pixmap, vistype,
-             resolution[0], resolution[1]);
+    /* Initialize cairo: Create one in-memory surface to render the unlock
+     * indicator on, create one XCB surface to actually draw (one or more,
+     * depending on the amount of screens) unlock indicators on. */
+    cairo_surface_t *output = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, BUTTON_DIAMETER, BUTTON_DIAMETER);
     cairo_t *ctx = cairo_create(output);
+
+    cairo_surface_t *xcb_output = cairo_xcb_surface_create(conn, bg_pixmap, vistype, resolution[0], resolution[1]);
+    cairo_t *xcb_ctx = cairo_create(xcb_output);
+
     if (img) {
         if (!tile) {
-            cairo_set_source_surface(ctx, img, 0, 0);
-            cairo_paint(ctx);
+            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;
             pattern = cairo_pattern_create_for_surface(img);
-            cairo_set_source(ctx, pattern);
+            cairo_set_source(xcb_ctx, pattern);
             cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
-            cairo_rectangle(ctx, 0, 0, resolution[0], resolution[1]);
-            cairo_fill(ctx);
+            cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
+            cairo_fill(xcb_ctx);
             cairo_pattern_destroy(pattern);
         }
+    } else {
+        char strgroups[3][3] = {{color[0], color[1], '\0'},
+                                {color[2], color[3], '\0'},
+                                {color[4], color[5], '\0'}};
+        uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
+                             (strtol(strgroups[1], NULL, 16)),
+                             (strtol(strgroups[2], NULL, 16))};
+        cairo_set_source_rgb(xcb_ctx, rgb16[0], rgb16[1], rgb16[2]);
+        cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
+        cairo_fill(xcb_ctx);
     }
 
     if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
-        cairo_pattern_t *outer_pat = NULL;
-
-        outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
-        switch (pam_state) {
-            case STATE_PAM_VERIFY:
-                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 0, 250.0/255);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 0, 250.0/255);
-                break;
-            case STATE_PAM_WRONG:
-                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 255.0/250, 139.0/255, 0);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 125.0/255, 51.0/255, 0);
-                break;
-            case STATE_PAM_IDLE:
-                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 125.0/255, 0);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 125.0/255, 0);
-                break;
-        }
-
         /* Draw a (centered) circle with transparent background. */
         cairo_set_line_width(ctx, 10.0);
         cairo_arc(ctx,
-                  (resolution[0] / 2) /* x */,
-                  (resolution[1] / 2) /* y */,
+                  BUTTON_CENTER /* x */,
+                  BUTTON_CENTER /* y */,
                   BUTTON_RADIUS /* radius */,
                   0 /* start */,
                   2 * M_PI /* end */);
@@ -142,17 +139,26 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
                 break;
         }
         cairo_fill_preserve(ctx);
-        cairo_set_source(ctx, outer_pat);
-        cairo_stroke(ctx);
 
-        cairo_pattern_destroy(outer_pat);
+        switch (pam_state) {
+            case STATE_PAM_VERIFY:
+                cairo_set_source_rgb(ctx, 51.0/255, 0, 250.0/255);
+                break;
+            case STATE_PAM_WRONG:
+                cairo_set_source_rgb(ctx, 125.0/255, 51.0/255, 0);
+                break;
+            case STATE_PAM_IDLE:
+                cairo_set_source_rgb(ctx, 51.0/255, 125.0/255, 0);
+                break;
+        }
+        cairo_stroke(ctx);
 
         /* Draw an inner seperator line. */
         cairo_set_source_rgb(ctx, 0, 0, 0);
         cairo_set_line_width(ctx, 2.0);
         cairo_arc(ctx,
-                  (resolution[0] / 2) /* x */,
-                  (resolution[1] / 2) /* y */,
+                  BUTTON_CENTER /* x */,
+                  BUTTON_CENTER /* y */,
                   BUTTON_RADIUS - 5 /* radius */,
                   0,
                   2 * M_PI);
@@ -181,8 +187,8 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
             cairo_set_font_size(ctx, 28.0);
 
             cairo_text_extents(ctx, text, &extents);
-            x = (resolution[0] / 2.0) - ((extents.width / 2) + extents.x_bearing);
-            y = (resolution[1] / 2.0) - ((extents.height / 2) + extents.y_bearing);
+            x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
+            y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing);
 
             cairo_move_to(ctx, x, y);
             cairo_show_text(ctx, text);
@@ -196,46 +202,65 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
             unlock_state == STATE_BACKSPACE_ACTIVE) {
             cairo_new_sub_path(ctx);
             double highlight_start = (rand() % (int)(2 * M_PI * 100)) / 100.0;
-            cairo_arc(ctx, resolution[0] / 2 /* x */, resolution[1] / 2 /* y */,
-                      BUTTON_RADIUS /* radius */, highlight_start,
+            cairo_arc(ctx,
+                      BUTTON_CENTER /* x */,
+                      BUTTON_CENTER /* y */,
+                      BUTTON_RADIUS /* radius */,
+                      highlight_start,
                       highlight_start + (M_PI / 3.0));
             if (unlock_state == STATE_KEY_ACTIVE) {
                 /* For normal keys, we use a lighter green. */
-                outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 219.0/255, 0);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 219.0/255, 0);
+                cairo_set_source_rgb(ctx, 51.0/255, 219.0/255, 0);
             } else {
                 /* For backspace, we use red. */
-                outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 219.0/255, 139.0/255, 0);
-                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 219.0/255, 51.0/255, 0);
+                cairo_set_source_rgb(ctx, 219.0/255, 51.0/255, 0);
             }
-            cairo_set_source(ctx, outer_pat);
             cairo_stroke(ctx);
 
             /* Draw two little separators for the highlighted part of the
              * unlock indicator. */
             cairo_set_source_rgb(ctx, 0, 0, 0);
             cairo_arc(ctx,
-                      (resolution[0] / 2) /* x */,
-                      (resolution[1] / 2) /* y */,
+                      BUTTON_CENTER /* x */,
+                      BUTTON_CENTER /* y */,
                       BUTTON_RADIUS /* radius */,
                       highlight_start /* start */,
                       highlight_start + (M_PI / 128.0) /* end */);
             cairo_stroke(ctx);
             cairo_arc(ctx,
-                      (resolution[0] / 2) /* x */,
-                      (resolution[1] / 2) /* y */,
+                      BUTTON_CENTER /* x */,
+                      BUTTON_CENTER /* y */,
                       BUTTON_RADIUS /* radius */,
                       highlight_start + (M_PI / 3.0) /* start */,
                       (highlight_start + (M_PI / 3.0)) + (M_PI / 128.0) /* end */);
             cairo_stroke(ctx);
-            cairo_pattern_destroy(outer_pat);
         }
     }
 
+    if (xr_screens > 0) {
+        /* Composite the unlock indicator in the middle of each screen. */
+        for (int screen = 0; screen < xr_screens; screen++) {
+            int x = (xr_resolutions[screen].x + ((xr_resolutions[screen].width / 2) - (BUTTON_DIAMETER / 2)));
+            int y = (xr_resolutions[screen].y + ((xr_resolutions[screen].height / 2) - (BUTTON_DIAMETER / 2)));
+            cairo_set_source_surface(xcb_ctx, output, x, y);
+            cairo_rectangle(xcb_ctx, x, y, BUTTON_DIAMETER, BUTTON_DIAMETER);
+            cairo_fill(xcb_ctx);
+        }
+    } else {
+        /* We have no information about the screen sizes/positions, so we just
+         * place the unlock indicator in the middle of the X root window and
+         * hope for the best. */
+        int x = (last_resolution[0] / 2);
+        int y = (last_resolution[1] / 2);
+        cairo_set_source_surface(xcb_ctx, output, x, y);
+        cairo_rectangle(xcb_ctx, x, y, BUTTON_DIAMETER, BUTTON_DIAMETER);
+        cairo_fill(xcb_ctx);
+    }
+
+    cairo_surface_destroy(xcb_output);
     cairo_surface_destroy(output);
     cairo_destroy(ctx);
+    cairo_destroy(xcb_ctx);
 #endif
     return bg_pixmap;
 }