Sync to AGG tree to support stippi's Painter classes

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10693 a95241bf-73f2-0310-859d-f6bbb57e9c96
2005-01-12 11:05:58 +00:00
parent 75d0f2ba9b
commit abd0030237
52 changed files with 2979 additions and 287 deletions
@@ -0,0 +1,121 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.2
+// Copyright (C) 2002-2004 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: [email protected]
+//          [email protected]
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_VPGEN_CLIP_POLYLINE_INCLUDED
+#define AGG_VPGEN_CLIP_POLYLINE_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //======================================================vpgen_clip_polyline
+    //
+    // See Implementation agg_vpgen_clip_polyline.cpp
+    //
+    class vpgen_clip_polyline
+    {
+    public:
+        vpgen_clip_polyline() : 
+            m_clip_box(0, 0, 1, 1),
+            m_x1(0),
+            m_y1(0),
+            m_f1(0),
+            m_x2(0),
+            m_y2(0),
+            m_f2(0),
+            m_num_vertices(0),
+            m_vertex(0)
+        {
+        }
+
+        void clip_box(double x1, double y1, double x2, double y2)
+        {
+            m_clip_box.x1 = x1;
+            m_clip_box.y1 = y1;
+            m_clip_box.x2 = x2;
+            m_clip_box.y2 = y2;
+            m_clip_box.normalize();
+        }
+
+
+        double x1() const { return m_clip_box.x1; }
+        double y1() const { return m_clip_box.y1; }
+        double x2() const { return m_clip_box.x2; }
+        double y2() const { return m_clip_box.y2; }
+
+        static bool auto_close()   { return false; }
+        static bool auto_unclose() { return true; }
+
+        void     reset();
+        void     move_to(double x, double y);
+        void     line_to(double x, double y);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        enum clipping_flags_def
+        {
+            clip_x1 = 1,
+            clip_x2 = 2,
+            clip_y1 = 4,
+            clip_y2 = 8
+        };
+
+        // Determine the clipping code of the vertex according to the 
+        // Cyrus-Beck line clipping algorithm
+        //--------------------------------------------------------------------
+        unsigned clipping_flags_x(double x)
+        {
+            unsigned f = 0;
+            if(x < m_clip_box.x1) f |= clip_x1;
+            if(x > m_clip_box.x2) f |= clip_x2;
+            return f;
+        }
+
+        unsigned clipping_flags_y(double y)
+        {
+            unsigned f = 0;
+            if(y < m_clip_box.y1) f |= clip_y1;
+            if(y > m_clip_box.y2) f |= clip_y2;
+            return f;
+        }
+
+        unsigned clipping_flags(double x, double y)
+        {
+            return clipping_flags_x(x) | clipping_flags_y(y);
+        }
+
+        bool move_point(double& x, double& y, unsigned& flags);
+        void clip_line_segment();
+
+    private:
+        rect_d        m_clip_box;
+        double        m_x1;
+        double        m_y1;
+        unsigned      m_f1;
+        double        m_x2;
+        double        m_y2;
+        unsigned      m_f2;
+        double        m_x[2];
+        double        m_y[2];
+        unsigned      m_cmd[2];
+        unsigned      m_num_vertices;
+        unsigned      m_vertex;
+    };
+
+}
+
+
+#endif