From 3a0814fdae1984e5853ea54b31f63dff442d74c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <superstippi@gmx.de>
Date: Thu, 10 Jul 2008 08:11:04 +0000
Subject: [PATCH] patch by Andrej Spielmann (GSOC): * Prepared the AGG
 base_renderer code with two more functions needed to   handle subpixel
 scanline coverage values.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26356 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 headers/libs/agg/agg_renderer_base.h | 39 ++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/headers/libs/agg/agg_renderer_base.h b/headers/libs/agg/agg_renderer_base.h
index 21f4487e32..b42168b05c 100644
--- a/headers/libs/agg/agg_renderer_base.h
+++ b/headers/libs/agg/agg_renderer_base.h
@@ -205,6 +205,22 @@ namespace agg
 
             m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover);
         }
+		
+		//--------------------------------------------------------------------
+        void blend_hline_subpix(int x1, int y, int x2, 
+                                const color_type& c, cover_type cover)
+        {
+            if(x1 > x2) { int t = x2; x2 = x1; x1 = t; }
+            if(y  > ymax()) return;
+            if(y  < ymin()) return;
+            if(x1 > xmax()) return;
+            if(x2 < xmin()) return;
+
+            if(x1 < xmin()) x1 = xmin();
+            if(x2 > xmax()) x2 = xmax();
+
+            m_ren->blend_hline_subpix(x1, y, x2 - x1 + 1, c, cover);
+        }
 
         //--------------------------------------------------------------------
         void blend_vline(int x, int y1, int y2, 
@@ -280,6 +296,29 @@ namespace agg
             }
             m_ren->blend_solid_hspan(x, y, len, c, covers);
         }
+		
+		//--------------------------------------------------------------------
+        void blend_solid_hspan_subpix(int x, int y, int len, 
+                                      const color_type& c, 
+                                      const cover_type* covers)
+        {
+            if(y > ymax()) return;
+            if(y < ymin()) return;
+
+            if(x < xmin())
+            {
+                len -= 3 * (xmin() - x);
+                if(len <= 0) return;
+                covers += 3*(xmin() - x);
+                x = xmin();
+            }
+            if(x + len / 3 > xmax())
+            {
+                len = 3 * (xmax() - x + 1);
+                if(len <= 0) return;
+            }
+            m_ren->blend_solid_hspan_subpix(x, y, len, c, covers);
+        }
 
         //--------------------------------------------------------------------
         void blend_solid_vspan(int x, int y, int len,