summaryrefslogtreecommitdiff
path: root/Source/DirectFB/src/gfx/clip.h
diff options
context:
space:
mode:
Diffstat (limited to 'Source/DirectFB/src/gfx/clip.h')
-rwxr-xr-xSource/DirectFB/src/gfx/clip.h125
1 files changed, 125 insertions, 0 deletions
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
+