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