1 /* 2 * art_render_gradient.h: Gradient image source for modular rendering. 3 * 4 * Libart_LGPL - library of basic graphic primitives 5 * Copyright (C) 2000 Raph Levien 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public 18 * License along with this library; if not, write to the 19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 20 * Boston, MA 02111-1307, USA. 21 * 22 * Authors: Raph Levien <raph@acm.org> 23 * Alexander Larsson <alla@lysator.liu.se> 24 */ 25 26 #ifndef __ART_RENDER_GRADIENT_H__ 27 #define __ART_RENDER_GRADIENT_H__ 28 29 #ifdef LIBART_COMPILATION 30 #include "art_filterlevel.h" 31 #include "art_render.h" 32 #else 33 #include <libart_lgpl/art_filterlevel.h> 34 #include <libart_lgpl/art_render.h> 35 #endif 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif /* __cplusplus */ 40 41 typedef struct _ArtGradientLinear ArtGradientLinear; 42 typedef struct _ArtGradientRadial ArtGradientRadial; 43 typedef struct _ArtGradientStop ArtGradientStop; 44 45 typedef enum { 46 ART_GRADIENT_PAD, 47 ART_GRADIENT_REFLECT, 48 ART_GRADIENT_REPEAT 49 } ArtGradientSpread; 50 51 struct _ArtGradientLinear { 52 double a; 53 double b; 54 double c; 55 ArtGradientSpread spread; 56 int n_stops; 57 ArtGradientStop *stops; 58 }; 59 60 struct _ArtGradientRadial { 61 double affine[6]; /* transforms user coordinates to unit circle */ 62 double fx, fy; /* focal point in unit circle coords */ 63 int n_stops; 64 ArtGradientStop *stops; 65 }; 66 67 struct _ArtGradientStop { 68 double offset; 69 ArtPixMaxDepth color[ART_MAX_CHAN + 1]; 70 }; 71 72 void 73 art_render_gradient_linear (ArtRender *render, 74 const ArtGradientLinear *gradient, 75 ArtFilterLevel level); 76 77 void 78 art_render_gradient_radial (ArtRender *render, 79 const ArtGradientRadial *gradient, 80 ArtFilterLevel level); 81 82 #ifdef __cplusplus 83 } 84 #endif /* __cplusplus */ 85 86 #endif /* __ART_RENDER_GRADIENT_H__ */ 87