From 7fe60435bce6595a9c58a9bfd8244d74b5320e96 Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Tue, 15 Jan 2013 08:46:13 +0100
Subject: Import DirectFB141_2k11R3_beta5

---
 Source/DirectFB/src/gfx/clip.h | 125 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100755 Source/DirectFB/src/gfx/clip.h

(limited to 'Source/DirectFB/src/gfx/clip.h')

diff --git a/Source/DirectFB/src/gfx/clip.h b/Source/DirectFB/src/gfx/clip.h
new file mode 100755
index 0000000..e1ea261
--- /dev/null
+++ b/Source/DirectFB/src/gfx/clip.h
@@ -0,0 +1,125 @@
+/*
+   (c) Copyright 2001-2009  The world wide DirectFB Open Source Community (directfb.org)
+   (c) Copyright 2000-2004  Convergence (integrated media) GmbH
+
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <dok@directfb.org>,
+              Andreas Hundt <andi@fischlustig.de>,
+              Sven Neumann <neo@directfb.org>,
+              Ville Syrjälä <syrjala@sci.fi> and
+              Claudio Ciccani <klan@users.sf.net>.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the
+   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+
+#ifndef __GFX__CLIP_H__
+#define __GFX__CLIP_H__
+
+#include <directfb.h>
+
+typedef enum {
+     DFEF_NONE      = 0x00000000,
+
+     DFEF_LEFT      = 0x00000001,
+     DFEF_RIGHT     = 0x00000002,
+     DFEF_TOP       = 0x00000004,
+     DFEF_BOTTOM    = 0x00000008,
+
+     DFEF_ALL       = 0x0000000F
+} DFBEdgeFlags;
+
+/*
+ * Clips the line to the clipping region.
+ * Returns DFB_TRUE if at least one pixel of the line resides in the region.
+ */
+DFBBoolean   dfb_clip_line( const DFBRegion *clip, DFBRegion *line );
+
+/*
+ * Clips the rectangle to the clipping region.
+ * Returns true if there was an intersection with the clipping region.
+ */
+DFBBoolean   dfb_clip_rectangle( const DFBRegion *clip, DFBRectangle *rect );
+
+/*
+ * Clips the rectangle to the clipping region.
+ * Returns a flag for each edge that wasn't cut off.
+ */
+DFBEdgeFlags dfb_clip_edges( const DFBRegion *clip, DFBRectangle *rect );
+
+static inline DFBBoolean
+dfb_clip_needed( const DFBRegion *clip, DFBRectangle *rect )
+{
+     return ((clip->x1 > rect->x) ||
+             (clip->y1 > rect->y) ||
+             (clip->x2 < rect->x + rect->w - 1) ||
+             (clip->y2 < rect->y + rect->h - 1));
+}
+
+/*
+ * Simple check if triangle lies outside the clipping region.
+ * Returns true if the triangle may be visible within the region.
+ */
+DFBBoolean   dfb_clip_triangle_precheck( const DFBRegion   *clip,
+                                         const DFBTriangle *tri );
+                                         
+/*
+ * Clips the triangle to the clipping region.
+ * Returns true if the triangle if visible within the region.
+ * The vertices of the polygon resulting from intersection are returned in buf.
+ * The number of vertices is at least 3.
+ */
+DFBBoolean   dfb_clip_triangle( const DFBRegion   *clip,
+                                const DFBTriangle *tri,
+                                DFBPoint           buf[6],
+                                int               *num );                                
+
+/*
+ * Simple check if requested blitting lies outside of the clipping region.
+ * Returns true if blitting may need to be performed.
+ */
+static inline DFBBoolean
+dfb_clip_blit_precheck( const DFBRegion *clip,
+                        int w, int h, int dx, int dy )
+{
+     if (w < 1 || h < 1 ||
+         (clip->x1 >= dx + w) ||
+         (clip->x2 < dx) ||
+         (clip->y1 >= dy + h) ||
+         (clip->y2 < dy))
+          return DFB_FALSE;
+
+     return DFB_TRUE;
+}
+
+/*
+ * Clips the blitting request to the clipping region.
+ * This includes adjustment of source AND destination coordinates.
+ */
+void dfb_clip_blit( const DFBRegion *clip,
+                    DFBRectangle *srect, int *dx, int *dy );
+
+/*
+ * Clips the stretch blit request to the clipping region.
+ * This includes adjustment of source AND destination coordinates
+ * based on the scaling factor.
+ */
+void dfb_clip_stretchblit( const DFBRegion *clip,
+                           DFBRectangle    *srect,
+                           DFBRectangle    *drect );
+
+#endif
+
-- 
cgit