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79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* art_render_gradient.h: Gradient image source for modular rendering.
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*
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* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 2000 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors: Raph Levien <raph@acm.org>
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* Alexander Larsson <alla@lysator.liu.se>
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*/
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#ifndef __ART_RENDER_GRADIENT_H__
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#define __ART_RENDER_GRADIENT_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct _ArtGradientLinear ArtGradientLinear;
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typedef struct _ArtGradientRadial ArtGradientRadial;
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typedef struct _ArtGradientStop ArtGradientStop;
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typedef enum {
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ART_GRADIENT_PAD,
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ART_GRADIENT_REFLECT,
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ART_GRADIENT_REPEAT
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} ArtGradientSpread;
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struct _ArtGradientLinear {
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double a;
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double b;
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double c;
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ArtGradientSpread spread;
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int n_stops;
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ArtGradientStop *stops;
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};
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struct _ArtGradientRadial {
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double affine[6]; /* transforms user coordinates to unit circle */
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double fx, fy; /* focal point in unit circle coords */
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int n_stops;
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ArtGradientStop *stops;
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};
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struct _ArtGradientStop {
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double offset;
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ArtPixMaxDepth color[ART_MAX_CHAN + 1];
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};
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void
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art_render_gradient_linear (ArtRender *render,
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const ArtGradientLinear *gradient,
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ArtFilterLevel level);
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void
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art_render_gradient_radial (ArtRender *render,
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const ArtGradientRadial *gradient,
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ArtFilterLevel level);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __ART_RENDER_GRADIENT_H__ */
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