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