research.m1stereo.tv/gitweb/ - melted/blob - src/modules/gtk2/pixops.h

   1 /* GdkPixbuf library - Scaling and compositing functions
   2  *
   3  * Copyright (C) 1999 The Free Software Foundation
   4  *
   5  * Author: Owen Taylor <otaylor@redhat.com>
   6  * Modified for YUV422 by: Dan Dennedy <dan@dennedy.org>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23
  24 #ifndef PIXOPS_H
  25 #define PIXOPS_H
  26
  27 #include <glib.h>
  28
  29 /* Interpolation modes; must match GdkInterpType */
  30 typedef enum {
  31         PIXOPS_INTERP_NEAREST,
  32         PIXOPS_INTERP_TILES,
  33         PIXOPS_INTERP_BILINEAR,
  34         PIXOPS_INTERP_HYPER
  35 } PixopsInterpType;
  36
  37 /* Scale src_buf from src_width / src_height by factors scale_x, scale_y
  38  * and composite the portion corresponding to
  39  * render_x, render_y, render_width, render_height in the new
  40  * coordinate system into dest_buf starting at 0, 0
  41  */
  42 void yuv422_scale     (guchar         *dest_buf,
  43                        int             render_x0,
  44                        int             render_y0,
  45                        int             render_x1,
  46                        int             render_y1,
  47                        int             dest_rowstride,
  48                        int             dest_channels,
  49                        int             dest_has_alpha,
  50                        const guchar   *src_buf,
  51                        int             src_width,
  52                        int             src_height,
  53                        int             src_rowstride,
  54                        int             src_channels,
  55                        int             src_has_alpha,
  56                        double          scale_x,
  57                        double          scale_y,
  58                        PixopsInterpType   interp_type);
  59
  60 #define yuv422_scale_simple( dest_buf, dest_width, dest_height, dest_rowstride, src_buf, src_width, src_height, src_rowstride, interp_type ) \
  61         yuv422_scale( (dest_buf), 0, 0, \
  62                 (dest_width)/2, (dest_height), \
  63                 (dest_rowstride), 4, 0, \
  64                 (src_buf), (src_width)/2, (src_height), \
  65                 (src_rowstride), 4, 0, \
  66                 (double) (dest_width) / (src_width), (double) (dest_height) / (src_height), \
  67                 (PixopsInterpType) interp_type );
  68
  69 #endif