Add fake transparency

config/config.def.c

@@ -144,4 +144,5 @@ Settings config = {
     .hide_scrollbar    = FALSE,
     .markup_rows       = FALSE,
     .fullscreen        = FALSE,
+    .fake_transparency = FALSE,
 };

include/rofi.h

@@ -246,6 +246,8 @@ typedef struct _Settings
     unsigned int   markup_rows;
     /** fullscreen */
     unsigned int   fullscreen;
+    /** bg image */
+    unsigned int   fake_transparency;
 } Settings;
 
 /** Global Settings structure. */

source/rofi.c

@@ -224,6 +224,7 @@ typedef struct MenuState
     int             *lines_not_ascii;
     int             line_height;
     unsigned int    border;
+    cairo_surface_t *bg;
 }MenuState;
 
 static Window create_window ( Display *display )
@@ -285,6 +286,10 @@ static void menu_free_state ( MenuState *state )
     textbox_free ( state->prompt_tb );
     textbox_free ( state->case_indicator );
     scrollbar_free ( state->scrollbar );
+    if ( state->bg ) {
+        cairo_surface_destroy ( state->bg );
+        state->bg = NULL;
+    }
 
     for ( unsigned int i = 0; i < state->max_elements; i++ ) {
         textbox_free ( state->boxes[i] );
@@ -829,9 +834,20 @@ static void menu_update ( MenuState *state )
     cairo_surface_t *surf = cairo_image_surface_create ( get_format (), state->w, state->h );
     cairo_t         *d    = cairo_create ( surf );
     cairo_set_operator ( d, CAIRO_OPERATOR_SOURCE );
+    if ( config.fake_transparency ) {
+        if ( state->bg != NULL ) {
+            cairo_set_source_surface ( d, state->bg, -(double) ( state->x ), -(double) ( state->y ) );
+            cairo_paint ( d );
+            cairo_set_operator ( d, CAIRO_OPERATOR_OVER );
+            color_background ( display, d );
+            cairo_paint ( d );
+        }
+    }
+    else {
         // Paint the background.
         color_background ( display, d );
         cairo_paint ( d );
+    }
     color_border ( display, d );
 
     if ( config.menu_bw > 0 ) {
@@ -1042,6 +1058,24 @@ MenuReturn menu ( Switcher *sw, char **input, char *prompt, unsigned int *select
             sn_launchee_context_setup_window ( sncontext, main_window );
         }
     }
+    Window root = DefaultRootWindow ( display );
+    if ( config.fake_transparency ) {
+        cairo_surface_t *s = cairo_xlib_surface_create ( display,
+                                                         root,
+                                                         DefaultVisual ( display, DefaultScreen ( display ) ),
+                                                         DisplayWidth ( display, DefaultScreen ( display ) ),
+                                                         DisplayHeight ( display, DefaultScreen ( display ) ) );
+
+        state.bg = cairo_image_surface_create ( get_format (),
+                                                DisplayWidth ( display, DefaultScreen ( display ) ),
+                                                DisplayHeight ( display, DefaultScreen ( display ) ) );
+        cairo_t *dr = cairo_create ( state.bg );
+        cairo_set_source_surface ( dr, s, 0, 0 );
+        cairo_paint ( dr );
+        cairo_destroy ( dr );
+        cairo_surface_destroy ( s );
+    }
+
     // Get active monitor size.
     monitor_active ( display, &mon );
 
@@ -1215,6 +1249,11 @@ MenuReturn menu ( Switcher *sw, char **input, char *prompt, unsigned int *select
         else if ( ev.type == ConfigureNotify ) {
             XConfigureEvent xce = ev.xconfigure;
             if ( xce.window == main_window ) {
+                if ( state.x != (int ) xce.x || state.y != (int) xce.y ) {
+                    state.x      = xce.x;
+                    state.y      = xce.y;
+                    state.update = TRUE;
+                }
                 if ( state.w != (unsigned int) xce.width || state.h != (unsigned int ) xce.height ) {
                     state.w = xce.width;
                     state.h = xce.height;

source/xrmoptions.c

@@ -133,7 +133,8 @@ static XrmOption xrmOptions[] = {
     { xrm_String,  "separator-style",      { .str  = &config.separator_style         }, NULL, "Separator style (none, dash, solid)"       },
     { xrm_Boolean, "hide-scrollbar",       { .num  = &config.hide_scrollbar          }, NULL, "Hide the scroll-bar"                       },
     { xrm_Boolean, "markup-rows",          { .num  = &config.markup_rows             }, NULL, "Show markup"                               },
-    { xrm_Boolean, "fullscreen",           { .num  = &config.fullscreen              }, NULL, "Fullscreen"                                }
+    { xrm_Boolean, "fullscreen",           { .num  = &config.fullscreen              }, NULL, "Fullscreen"                                },
+    { xrm_Boolean, "fake-transparency",    { .num  = &config.fake_transparency       }, NULL, "Fake transparency"                         }
 };
 
 // Dynamic options.