1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* art_render.h: Modular rendering architecture.
*
* 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.
*/
#ifndef __ART_RENDER_H__
#define __ART_RENDER_H__
#ifdef LIBART_COMPILATION
#include "art_config.h"
#include "art_alphagamma.h"
#else
#include <libart_lgpl/art_config.h>
#include <libart_lgpl/art_alphagamma.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Render object */
#ifndef ART_MAX_DEPTH
#define ART_MAX_DEPTH 16
#endif
#if ART_MAX_DEPTH == 16
typedef art_u16 ArtPixMaxDepth;
#define ART_PIX_MAX_FROM_8(x) ((x) | ((x) << 8))
#define ART_PIX_8_FROM_MAX(x) (((x) + 0x80 - (((x) + 0x80) >> 8)) >> 8)
#else
#if ART_MAX_DEPTH == 8
typedef art_u8 ArtPixMaxDepth;
#define ART_PIX_MAX_FROM_8(x) (x)
#define ART_PIX_8_FROM_MAX(x) (x)
#else
#error ART_MAX_DEPTH must be either 8 or 16
#endif
#endif
#define ART_MAX_CHAN 16
typedef struct _ArtRender ArtRender;
typedef struct _ArtRenderCallback ArtRenderCallback;
typedef struct _ArtRenderMaskRun ArtRenderMaskRun;
typedef struct _ArtImageSource ArtImageSource;
typedef struct _ArtMaskSource ArtMaskSource;
typedef enum {
ART_ALPHA_NONE = 0,
ART_ALPHA_SEPARATE = 1,
ART_ALPHA_PREMUL = 2
} ArtAlphaType;
typedef enum {
ART_COMPOSITE_NORMAL,
ART_COMPOSITE_MULTIPLY,
/* todo: more */
ART_COMPOSITE_CUSTOM
} ArtCompositingMode;
typedef enum {
ART_IMAGE_SOURCE_CAN_CLEAR = 1,
ART_IMAGE_SOURCE_CAN_COMPOSITE = 2
} ArtImageSourceFlags;
struct _ArtRenderMaskRun {
int x;
int alpha;
};
struct _ArtRenderCallback {
void (*render) (ArtRenderCallback *self, ArtRender *render,
art_u8 *dest, int y);
void (*done) (ArtRenderCallback *self, ArtRender *render);
};
struct _ArtImageSource {
ArtRenderCallback super;
void (*negotiate) (ArtImageSource *self, ArtRender *render,
ArtImageSourceFlags *p_flags,
int *p_buf_depth, ArtAlphaType *p_alpha_type);
};
struct _ArtMaskSource {
ArtRenderCallback super;
int (*can_drive) (ArtMaskSource *self, ArtRender *render);
/* For each mask source, ::prepare() is invoked if it is not
a driver, or ::invoke_driver() if it is. */
void (*invoke_driver) (ArtMaskSource *self, ArtRender *render);
void (*prepare) (ArtMaskSource *self, ArtRender *render, art_boolean first);
};
struct _ArtRender {
/* parameters of destination image */
int x0, y0;
int x1, y1;
art_u8 *pixels;
int rowstride;
int n_chan;
int depth;
ArtAlphaType alpha_type;
art_boolean clear;
ArtPixMaxDepth clear_color[ART_MAX_CHAN + 1];
art_u32 opacity; /* [0..0x10000] */
ArtCompositingMode compositing_mode;
ArtAlphaGamma *alphagamma;
art_u8 *alpha_buf;
/* parameters of intermediate buffer */
int buf_depth;
ArtAlphaType buf_alpha;
art_u8 *image_buf;
/* driving alpha scanline data */
/* A "run" is a contiguous sequence of x values with the same alpha value. */
int n_run;
ArtRenderMaskRun *run;
/* A "span" is a contiguous sequence of x values with non-zero alpha. */
int n_span;
int *span_x;
art_boolean need_span;
};
LIBART_EXPORT ArtRender *
art_render_new (int x0, int y0, int x1, int y1,
art_u8 *pixels, int rowstride,
int n_chan, int depth, ArtAlphaType alpha_type,
ArtAlphaGamma *alphagamma);
LIBART_EXPORT void
art_render_invoke (ArtRender *render);
LIBART_EXPORT void
art_render_clear (ArtRender *render, const ArtPixMaxDepth *clear_color);
LIBART_EXPORT void
art_render_clear_rgb (ArtRender *render, art_u32 clear_rgb);
LIBART_EXPORT void
art_render_mask_solid (ArtRender *render, int opacity);
LIBART_EXPORT void
art_render_image_solid (ArtRender *render, ArtPixMaxDepth *color);
/* The next two functions are for custom mask sources only. */
LIBART_EXPORT void
art_render_add_mask_source (ArtRender *render, ArtMaskSource *mask_source);
LIBART_EXPORT void
art_render_invoke_callbacks (ArtRender *render, art_u8 *dest, int y);
/* The following function is for custom image sources only. */
LIBART_EXPORT void
art_render_add_image_source (ArtRender *render, ArtImageSource *image_source);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __ART_RENDER_H__ */
|
