From 9aabff83c1cd698f371a9c13b66868ad1228c301 Mon Sep 17 00:00:00 2001
From: Søren Sandmann Pedersen <ssp@redhat.com>
Date: Mon, 14 Jan 2013 06:13:19 -0500
Subject: asdf

---
 pics.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/pics.c b/pics.c
index 9c344de..794b375 100644
--- a/pics.c
+++ b/pics.c
@@ -536,6 +536,8 @@ clear_to_white (cairo_t *cr)
 static void
 draw_pixel_box (cairo_t *cr)
 {
+  cairo_save (cr);
+  cairo_set_line_width (cr, 1.4142135623730951);
   cairo_set_source_rgb (cr, 0, 0, 0);
   cairo_rectangle (cr, 1, 1, 178, 178);
   cairo_move_to (cr, 1, 1);
@@ -543,6 +545,7 @@ draw_pixel_box (cairo_t *cr)
   cairo_move_to (cr, 179, 1);
   cairo_line_to (cr, 1, 179);
   cairo_stroke (cr);
+  cairo_restore (cr);
 }
 
 static void
@@ -562,6 +565,49 @@ general_pixel_diagram (const char *filename)
   finish (cr, filename);
 }
 
+static void
+over_diagram (const char *filename)
+{
+  cairo_t *cr = get_cairo (180, 180);
+
+  cairo_move_to (cr, 1, 1);
+  cairo_line_to (cr, 90, 90);
+  cairo_line_to (cr, 179, 1);
+  cairo_set_source_rgb (cr, SOURCE_COLOR);
+  cairo_fill (cr);
+
+  cairo_set_source_rgb (cr, 1, 1, 1);
+  centered_text (cr, 90, 45, "Both");
+
+  cairo_move_to (cr, 1, 1);
+  cairo_line_to (cr, 90, 90);
+  cairo_line_to (cr, 1, 179);
+  cairo_set_source_rgb (cr, SOURCE_COLOR);
+  cairo_fill (cr);
+
+  cairo_set_source_rgb (cr, 1, 1, 1);
+  centered_text (cr, 35, 90, "Source");
+
+  cairo_move_to (cr, 179, 1);
+  cairo_line_to (cr, 90, 90);
+  cairo_line_to (cr, 179, 179);
+  cairo_set_source_rgb (cr, DEST_COLOR);
+  cairo_fill (cr);
+  
+  cairo_set_source_rgb (cr, 1, 1, 1);
+  centered_text (cr, 145, 90, "Dest");
+
+  cairo_set_source_rgb (cr, 0, 0, 0);
+  centered_text (cr, 90, 147, "Neither");
+
+  cairo_new_path (cr);
+
+  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+  draw_pixel_box (cr);
+
+  finish (cr, filename);
+}
+
 static void
 dest_atop_diagram (const char *filename)
 {
@@ -724,6 +770,7 @@ main (int argc, char *argv)
   create_op (CAIRO_OPERATOR_OVER, "Over", "over.png");
   create_porter_duff_table ();
   general_pixel_diagram ("diagram.png");
+  over_diagram ("over-diagram.png");
   dest_atop_diagram ("destatop-diagram.png");
   color_dodge_diagram ("colordodge-diagram.png");
   color_dodge_dest_diagram ("colordodge-dest-diagram.png");
-- 
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