[gimp] libgimpwidgets: port the GimpChainButton lines to cairo

[Michael Natterer <mitch src gnome org>]

commit 1de338ea9d14e0c264b64248c31d9cea430083a5
Author: Michael Natterer <mitch gimp org>
Date:   Fri Oct 15 10:35:28 2010 +0200

    libgimpwidgets: port the GimpChainButton lines to cairo
    
    A proper two-pixel line in FG color looks a lot less shabby...

 libgimpwidgets/gimpchainbutton.c |   43 ++++++++++++++++---------------------
 1 files changed, 19 insertions(+), 24 deletions(-)
---
diff --git a/libgimpwidgets/gimpchainbutton.c b/libgimpwidgets/gimpchainbutton.c
index 54bccc4..0fc2b31 100644
--- a/libgimpwidgets/gimpchainbutton.c
+++ b/libgimpwidgets/gimpchainbutton.c
@@ -373,15 +373,19 @@ gimp_chain_line_new (GimpChainPosition  position,
 }
 
 static gboolean
-gimp_chain_line_expose_event (GtkWidget       *widget,
-                              GdkEventExpose  *event)
+gimp_chain_line_expose_event (GtkWidget      *widget,
+                              GdkEventExpose *event)
 {
-  GimpChainLine     *line = ((GimpChainLine *) widget);
+  GtkStyle          *style = gtk_widget_get_style (widget);
+  GimpChainLine     *line  = ((GimpChainLine *) widget);
   GtkAllocation      allocation;
   GdkPoint           points[3];
-  GdkPoint           buf;
-  GtkShadowType      shadow;
   GimpChainPosition  position;
+  cairo_t           *cr;
+
+  cr = gdk_cairo_create (gtk_widget_get_window (widget));
+  gdk_cairo_region (cr, event->region);
+  cairo_clip (cr);
 
   gtk_widget_get_allocation (widget, &allocation);
 
@@ -419,7 +423,6 @@ gimp_chain_line_expose_event (GtkWidget       *widget,
       points[2].y = (line->which == 1 ?
                      allocation.y + allocation.height - 1 :
                      allocation.y);
-      shadow = GTK_SHADOW_ETCHED_IN;
       break;
 
     case GIMP_CHAIN_RIGHT:
@@ -430,7 +433,6 @@ gimp_chain_line_expose_event (GtkWidget       *widget,
       points[2].y = (line->which == 1 ?
                      allocation.y + allocation.height - 1 :
                      allocation.y);
-      shadow = GTK_SHADOW_ETCHED_OUT;
       break;
 
     case GIMP_CHAIN_TOP:
@@ -441,7 +443,6 @@ gimp_chain_line_expose_event (GtkWidget       *widget,
                      allocation.x + allocation.width - 1 :
                      allocation.x);
       points[2].y = points[1].y;
-      shadow = GTK_SHADOW_ETCHED_OUT;
       break;
 
     case GIMP_CHAIN_BOTTOM:
@@ -452,29 +453,23 @@ gimp_chain_line_expose_event (GtkWidget       *widget,
                      allocation.x + allocation.width - 1 :
                      allocation.x);
       points[2].y = points[1].y;
-      shadow = GTK_SHADOW_ETCHED_IN;
       break;
 
     default:
       return FALSE;
     }
 
-  if ( ((shadow == GTK_SHADOW_ETCHED_OUT) && (line->which == -1)) ||
-       ((shadow == GTK_SHADOW_ETCHED_IN)  && (line->which == 1)) )
-    {
-      buf = points[0];
-      points[0] = points[2];
-      points[2] = buf;
-    }
+  cairo_move_to (cr, points[0].x, points[0].y);
+  cairo_line_to (cr, points[1].x, points[1].y);
+  cairo_line_to (cr, points[2].x, points[2].y);
+
+  cairo_set_line_width (cr, 2.0);
+  cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+  gdk_cairo_set_source_color (cr, &style->fg[GTK_STATE_NORMAL]);
+
+  cairo_stroke (cr);
 
-  gtk_paint_polygon (gtk_widget_get_style (widget),
-                     gtk_widget_get_window (widget), GTK_STATE_NORMAL,
-                     shadow,
-                     &event->area,
-                     widget,
-                     "chainbutton",
-                     points, 3,
-                     FALSE);
+  cairo_destroy (cr);
 
   return TRUE;
 }