path: root/iconsupport.patch

diff --git a/include/atoms_rest.xmacro b/include/atoms_rest.xmacro
index b65a81d..df56fd3 100644
--- a/include/atoms_rest.xmacro
+++ b/include/atoms_rest.xmacro
@@ -1,6 +1,7 @@
 xmacro(_NET_WM_USER_TIME)
 xmacro(_NET_STARTUP_ID)
 xmacro(_NET_WORKAREA)
+xmacro(_NET_WM_ICON)
 xmacro(WM_PROTOCOLS)
 xmacro(WM_DELETE_WINDOW)
 xmacro(UTF8_STRING)
--- a/include/data.h
+++ b/include/data.h
@@ -483,7 +483,12 @@ struct Window {
 
     /* aspect ratio from WM_NORMAL_HINTS (MPlayer uses this for example) */
     double min_aspect_ratio;
     double max_aspect_ratio;
+
+    /** Window icon, as array of ARGB pixels */
+    uint32_t* icon;
+    int icon_width;
+    int icon_height;
 
     /** The window has a nonrectangular shape. */
     bool shaped;
diff --git a/include/libi3.h b/include/libi3.h
index 790baba..cc88ee7 100644
--- a/include/libi3.h
+++ b/include/libi3.h
@@ -614,6 +614,11 @@ color_t draw_util_hex_to_color(const char *color);
  */
 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width);
 
+/**
+ * Draw the given image using libi3.
+ */
+void draw_util_image(unsigned char *src, int src_width, int src_height, surface_t *surface, int x, int y, int width, int height);
+
 /**
  * Draws a filled rectangle.
  * This function is a convenience wrapper and takes care of flushing the
--- a/include/window.h
+++ b/include/window.h
@@ -89,3 +89,9 @@ void window_update_hints(i3Window *win, xcb_get_property_reply_t *prop, bool *ur
  *
  */
 void window_update_motif_hints(i3Window *win, xcb_get_property_reply_t *prop, border_style_t *motif_border_style);
+
+/**
+ * Updates the _NET_WM_ICON
+ *
+ */
+void window_update_icon(i3Window *win, xcb_get_property_reply_t *prop);
--- a/libi3/draw_util.c
+++ b/libi3/draw_util.c
@@ -140,6 +140,42 @@ void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_
     cairo_surface_mark_dirty(surface->surface);
 }
 
+
+/**
+ * Draw the given image using libi3.
+ * This function is a convenience wrapper and takes care of flushing the
+ * surface as well as restoring the cairo state.
+ *
+ */
+void draw_util_image(unsigned char *src, int src_width, int src_height, surface_t *surface, int x, int y, int width, int height) {
+    RETURN_UNLESS_SURFACE_INITIALIZED(surface);
+
+    double scale;
+
+    cairo_save(surface->cr);
+
+    cairo_surface_t *image;
+
+    image = cairo_image_surface_create_for_data(
+            src,
+            CAIRO_FORMAT_ARGB32,
+            src_width,
+            src_height,
+            src_width * 4);
+
+    cairo_translate(surface->cr, x, y);
+
+    scale = MIN((double)width / src_width, (double)height / src_height);
+    cairo_scale(surface->cr, scale, scale);
+
+    cairo_set_source_surface(surface->cr, image, 0, 0);
+    cairo_paint(surface->cr);
+
+    cairo_surface_destroy(image);
+
+    cairo_restore(surface->cr);
+}
+
 /*
  * Draws a filled rectangle.
  * This function is a convenience wrapper and takes care of flushing the
--- a/src/handlers.c
+++ b/src/handlers.c
@@ -1392,6 +1392,19 @@ static bool handle_strut_partial_change(void *data, xcb_connection_t *conn, uint
     return true;
 }
 
+static bool handle_windowicon_change(void *data, xcb_connection_t *conn, uint8_t state,
+                                     xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *prop) {
+    Con *con;
+    if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
+        return false;
+
+    window_update_icon(con->window, prop);
+
+    x_push_changes(croot);
+
+    return true;
+}
+
 /* Returns false if the event could not be processed (e.g. the window could not
  * be found), true otherwise */
 typedef bool (*cb_property_handler_t)(void *data, xcb_connection_t *c, uint8_t state, xcb_window_t window, xcb_atom_t atom, xcb_get_property_reply_t *property);
@@ -1413,7 +1426,8 @@ static struct property_handler_t property_handlers[] = {
     {0, 128, handle_class_change},
     {0, UINT_MAX, handle_strut_partial_change},
     {0, UINT_MAX, handle_window_type},
-    {0, 5 * sizeof(uint64_t), handle_motif_hints_change}};
+    {0, 5 * sizeof(uint64_t), handle_motif_hints_change},
+    {0, UINT_MAX, handle_windowicon_change}};
 #define NUM_HANDLERS (sizeof(property_handlers) / sizeof(struct property_handler_t))
 
 /*
@@ -1435,6 +1449,7 @@ void property_handlers_init(void) {
     property_handlers[8].atom = A__NET_WM_STRUT_PARTIAL;
     property_handlers[9].atom = A__NET_WM_WINDOW_TYPE;
     property_handlers[10].atom = A__MOTIF_WM_HINTS;
+    property_handlers[11].atom = A__NET_WM_ICON;
 }
 
 static void property_notify(uint8_t state, xcb_window_t window, xcb_atom_t atom) {
--- a/src/manage.c
+++ b/src/manage.c
@@ -91,6 +91,8 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
         role_cookie, startup_id_cookie, wm_hints_cookie,
         wm_normal_hints_cookie, motif_wm_hints_cookie, wm_user_time_cookie, wm_desktop_cookie;
 
+    xcb_get_property_cookie_t wm_icon_cookie;
+
     geomc = xcb_get_geometry(conn, d);
 
     /* Check if the window is mapped (it could be not mapped when intializing and
@@ -162,6 +164,7 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
     motif_wm_hints_cookie = GET_PROPERTY(A__MOTIF_WM_HINTS, 5 * sizeof(uint64_t));
     wm_user_time_cookie = GET_PROPERTY(A__NET_WM_USER_TIME, UINT32_MAX);
     wm_desktop_cookie = GET_PROPERTY(A__NET_WM_DESKTOP, UINT32_MAX);
+    wm_icon_cookie = GET_PROPERTY(A__NET_WM_ICON, UINT32_MAX);
 
     DLOG("Managing window 0x%08x\n", window);
 
@@ -177,6 +180,7 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
     window_update_class(cwindow, xcb_get_property_reply(conn, class_cookie, NULL));
     window_update_name_legacy(cwindow, xcb_get_property_reply(conn, title_cookie, NULL));
     window_update_name(cwindow, xcb_get_property_reply(conn, utf8_title_cookie, NULL));
+    window_update_icon(cwindow, xcb_get_property_reply(conn, wm_icon_cookie, NULL));
     window_update_leader(cwindow, xcb_get_property_reply(conn, leader_cookie, NULL));
     window_update_transient_for(cwindow, xcb_get_property_reply(conn, transient_cookie, NULL));
     window_update_strut_partial(cwindow, xcb_get_property_reply(conn, strut_cookie, NULL));
--- a/src/window.c
+++ b/src/window.c
@@ -17,6 +17,7 @@ void window_free(i3Window *win) {
     FREE(win->class_class);
     FREE(win->class_instance);
     i3string_free(win->name);
+    FREE(win->icon);
     FREE(win->ran_assignments);
     FREE(win);
 }
@@ -371,3 +372,91 @@ void window_update_motif_hints(i3Window *win, xcb_get_property_reply_t *prop, bo
 #undef MWM_DECOR_BORDER
 #undef MWM_DECOR_TITLE
 }
+
+void window_update_icon(i3Window *win, xcb_get_property_reply_t *prop) {
+    uint32_t *data = NULL;
+    uint32_t width, height;
+    uint64_t len = 0;
+    const int pref_size = render_deco_height() - logical_px(2);
+
+    if (!prop || prop->type != XCB_ATOM_CARDINAL || prop->format != 32) {
+        DLOG("_NET_WM_ICON is not set\n");
+        FREE(prop);
+        return;
+    }
+
+    uint32_t prop_value_len = xcb_get_property_value_length(prop);
+    uint32_t *prop_value = (uint32_t *) xcb_get_property_value(prop);
+
+    /* Find an icon matching the preferred size.
+     * If there is no such icon, take the smallest icon having at least
+     * the preferred size
+     */
+    while (prop_value_len > (sizeof(uint32_t) * 2) && prop_value &&
+            prop_value[0] && prop_value[1]) {
+        /* Check that the property is as long as it should be (in bytes),
+           handling integer overflow. "+2" to handle the width and height
+           fields. */
+        const uint64_t cur_len = prop_value[0] * (uint64_t) prop_value[1];
+        const uint64_t expected_len = (cur_len + 2) * 4;
+        const uint32_t cur_width = prop_value[0];
+        const uint32_t cur_height = prop_value[1];
+
+        if (expected_len > prop_value_len) {
+            break;
+        }
+
+        DLOG("Found _NET_WM_ICON of size: (%d,%d)\n", cur_width, cur_height);
+
+        if (len == 0 || (cur_width >= pref_size && cur_height >= pref_size &&
+                         (cur_width < width || cur_height < height ||
+                          width < pref_size || height < pref_size))) {
+            len = cur_len;
+            width = cur_width;
+            height = cur_height;
+            data = prop_value;
+        }
+
+        if (width == pref_size && height == pref_size) {
+            break;
+        }
+
+        /* Find pointer to next icon in the reply. */
+        prop_value_len -= expected_len;
+        prop_value = (uint32_t *) (((uint8_t *) prop_value) + expected_len);
+    }
+
+    if (!data) {
+        DLOG("Could not get _NET_WM_ICON\n");
+        FREE(prop);
+        return;
+    }
+
+    DLOG("Using icon of size (%d,%d) (preferred size: %d)\n",
+         width, height, pref_size
+    );
+
+    win->name_x_changed = true; /* trigger a redraw */
+
+    win->icon_width = width;
+    win->icon_height = height;
+    win->icon = srealloc(win->icon, len * 4);
+
+
+    for (uint64_t i = 0; i < len; i++) {
+        uint8_t r, g, b, a;
+        a = (data[2 + i] >> 24) & 0xff;
+        r = (data[2 + i] >> 16) & 0xff;
+        g = (data[2 + i] >>  8) & 0xff;
+        b = (data[2 + i] >>  0) & 0xff;
+
+        /* Cairo uses premultiplied alpha */
+        r = (r * a) / 0xff;
+        g = (g * a) / 0xff;
+        b = (b * a) / 0xff;
+
+        win->icon[i] = (a << 24) | (r << 16) | (g << 8) | b;
+    }
+
+    FREE(prop);
+}
--- a/src/x.c
+++ b/src/x.c
@@ -576,11 +576,35 @@ void x_draw_decoration(Con *con) {
     /* 5: draw two unconnected horizontal lines in border color */
     x_draw_title_border(con, p);
 
-    /* 6: draw the title */
+    /* 6: draw the icon and title */
     int text_offset_y = (con->deco_rect.height - config.font.height) / 2;
+    int text_offset_x = 0;
+
+    struct Window *win = con->window;
 
     const int title_padding = logical_px(2);
     const int deco_width = (int)con->deco_rect.width;
+
+    /* Draw the icon */
+    if (win && win->icon) {
+        uint16_t icon_size = con->deco_rect.height - 2 * logical_px(1);
+
+        int icon_offset_y = (con->deco_rect.height - icon_size) / 2;
+
+        text_offset_x += icon_size + logical_px(1);
+
+        draw_util_image(
+                (unsigned char *)win->icon,
+                win->icon_width,
+                win->icon_height,
+                &(parent->frame_buffer),
+                con->deco_rect.x + logical_px(1),
+                con->deco_rect.y + icon_offset_y,
+                icon_size,
+                icon_size);
+    }
+
+
     int mark_width = 0;
     if (config.show_marks && !TAILQ_EMPTY(&(con->marks_head))) {
         char *formatted_mark = sstrdup("");
@@ -619,7 +643,6 @@ void x_draw_decoration(Con *con) {
     }
 
     i3String *title = NULL;
-    struct Window *win = con->window;
     if (win == NULL) {
         if (con->title_format == NULL) {
             char *_title;
@@ -663,9 +686,9 @@ void x_draw_decoration(Con *con) {
 
     draw_util_text(title, &(parent->frame_buffer),
                    p->color->text, p->color->background,
-                   con->deco_rect.x + title_offset_x,
+                   con->deco_rect.x + text_offset_x + title_offset_x,
                    con->deco_rect.y + text_offset_y,
-                   deco_width - mark_width - 2 * title_padding);
+                   deco_width - text_offset_x - mark_width - 2 * title_padding);
 
     if (win == NULL || con->title_format != NULL) {
         I3STRING_FREE(title);