swfdec/swfdec_color.h

   1 /* Swfdec
   2  * Copyright (C) 2003-2006 David Schleef <ds@schleef.org>
   3  *               2005-2006 Eric Anholt <eric@anholt.net>
   4  *               2006-2007 Benjamin Otte <otte@gnome.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA  02110-1301  USA
  20  */
  21
  22 #ifndef __SWFDEC_COLOR_H__
  23 #define __SWFDEC_COLOR_H__
  24
  25 #include <swfdec/swfdec_types.h>
  26
  27 G_BEGIN_DECLS
  28
  29 struct _SwfdecColorTransform {
  30   gboolean mask;                        /* TRUE if this is a mask - masks are always black */
  31   /* naming here is taken from ActionScript, where ?a is the multiplier and ?b the offset */
  32   int ra, rb, ga, gb, ba, bb, aa, ab;
  33 };
  34
  35 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  36 #define SWFDEC_COLOR_INDEX_ALPHA (3)
  37 #define SWFDEC_COLOR_INDEX_RED (2)
  38 #define SWFDEC_COLOR_INDEX_GREEN (1)
  39 #define SWFDEC_COLOR_INDEX_BLUE (0)
  40 #elif G_BYTE_ORDER == G_BIG_ENDIAN
  41 #define SWFDEC_COLOR_INDEX_ALPHA (0)
  42 #define SWFDEC_COLOR_INDEX_RED (1)
  43 #define SWFDEC_COLOR_INDEX_GREEN (2)
  44 #define SWFDEC_COLOR_INDEX_BLUE (3)
  45 #else
  46 #error "Unknown byte order"
  47 #endif
  48
  49 #define SWFDEC_COLOR_COMBINE(r,g,b,a)   ((SwfdecColor) (((a)<<24) | ((r)<<16) | ((g)<<8) | (b)))
  50 #define SWFDEC_COLOR_OPAQUE(color)      ((SwfdecColor) ((color) | SWFDEC_COLOR_COMBINE (0, 0, 0, 0xFF)))
  51 #define SWFDEC_COLOR_ALPHA(x)           (((x)>>24)&0xff)
  52 #define SWFDEC_COLOR_RED(x)             (((x)>>16)&0xff)
  53 #define SWFDEC_COLOR_GREEN(x)           (((x)>>8)&0xff)
  54 #define SWFDEC_COLOR_BLUE(x)            ((x)&0xff)
  55
  56 #define SWFDEC_COLOR_WHITE              SWFDEC_COLOR_COMBINE (0xFF, 0xFF, 0xFF, 0xFF)
  57
  58 SwfdecColor     swfdec_color_apply_morph                        (SwfdecColor            start,
  59                                                                  SwfdecColor            end,
  60                                                                  guint                  ratio);
  61 void            swfdec_color_set_source                         (cairo_t *              cr,
  62                                                                  SwfdecColor            color);
  63 void            swfdec_color_transform_init_identity            (SwfdecColorTransform * trans);
  64 void            swfdec_color_transform_init_mask                (SwfdecColorTransform * trans);
  65 void            swfdec_color_transform_init_color               (SwfdecColorTransform * trans,
  66                                                                  SwfdecColor            color);
  67 gboolean        swfdec_color_transform_is_identity              (const SwfdecColorTransform *   trans);
  68 gboolean        swfdec_color_transform_is_alpha                 (const SwfdecColorTransform *   trans);
  69 #define swfdec_color_transform_is_mask(trans) ((trans)->mask)
  70 void            swfdec_color_transform_chain                    (SwfdecColorTransform * dest,
  71                                                                  const SwfdecColorTransform *   last,
  72                                                                  const SwfdecColorTransform *   first);
  73 SwfdecColor     swfdec_color_apply_transform                    (SwfdecColor            in,
  74                                                                  const SwfdecColorTransform *   trans);
  75 SwfdecColor     swfdec_color_apply_transform_premultiplied      (SwfdecColor            in,
  76                                                                  const SwfdecColorTransform *   trans);
  77
  78 void            swfdec_matrix_ensure_invertible                 (cairo_matrix_t *       matrix,
  79                                                                  cairo_matrix_t *       inverse);
  80 double          swfdec_matrix_get_xscale                        (const cairo_matrix_t * matrix);
  81 double          swfdec_matrix_get_yscale                        (const cairo_matrix_t * matrix);
  82 double          swfdec_matrix_get_rotation                      (const cairo_matrix_t * matrix);
  83 void            swfdec_matrix_morph                             (cairo_matrix_t *       dest,
  84                                                                  const cairo_matrix_t * start,
  85                                                                  const cairo_matrix_t * end,
  86                                                                  guint                  ratio);
  87
  88
  89 G_END_DECLS
  90 #endif