src/libnr/nr-gradient.h

   1 #ifndef __NR_GRADIENT_H__
   2 #define __NR_GRADIENT_H__
   3
   4 /*
   5  * Pixel buffer rendering library
   6  *
   7  * Authors:
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *
  10  * Copyright (C) 2001-2002 Lauris Kaplinski
  11  * Copyright (C) 2001-2002 Ximian, Inc.
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 /*
  17  * Derived in part from public domain code by Lauris Kaplinski
  18  */
  19
  20 #include <libnr/nr-matrix.h>
  21 #include <libnr/nr-render.h>
  22
  23 #define NR_GRADIENT_VECTOR_LENGTH 1024
  24
  25 enum {
  26         NR_GRADIENT_SPREAD_PAD,
  27         NR_GRADIENT_SPREAD_REFLECT,
  28         NR_GRADIENT_SPREAD_REPEAT
  29 };
  30
  31 /* Linear */
  32
  33 struct NRLGradientRenderer {
  34         NRRenderer renderer;
  35         const unsigned char *vector;
  36         unsigned int spread;
  37         double x0, y0;
  38         double dx, dy;
  39 };
  40
  41 NRRenderer *nr_lgradient_renderer_setup (NRLGradientRenderer *lgr,
  42                                          const unsigned char *cv,
  43                                          unsigned int spread,
  44                                          const NRMatrix *gs2px,
  45                                          float x0, float y0,
  46                                          float x1, float y1);
  47
  48 /* Radial */
  49
  50 struct NRRGradientRenderer {
  51         NRRenderer renderer;
  52         const unsigned char *vector;
  53         unsigned int spread;
  54         NRMatrix px2gs;
  55         float cx, cy;
  56         float fx, fy;
  57         float r;
  58         float C;
  59 };
  60
  61 NRRenderer *nr_rgradient_renderer_setup (NRRGradientRenderer *rgr,
  62                                          const unsigned char *cv,
  63                                          unsigned int spread,
  64                                          const NRMatrix *gs2px,
  65                                          float cx, float cy,
  66                                          float fx, float fy,
  67                                          float r);
  68
  69
  70
  71 #endif