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
|
/*
Ruby/SDL Ruby extension library for SDL
Copyright (C) 2001-2007 Ohbayashi Ippei
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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
*/
/* sge's copyright */
/*
*
*
* SDL Graphics Extension
* Basic drawing functions
*
* Started 990815
*
* License: LGPL v2+ (see the file LICENSE)
* (c)1999-2001 Anders Lindstr
*/
/* pixel access functions,from sge_draw.cpp */
#include "rubysdl.h"
#if SDL_VERSIONNUM(SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL) >= SDL_VERSIONNUM(1, 1, 5)
#define clip_xmin(pnt) pnt->clip_rect.x
#define clip_xmax(pnt) pnt->clip_rect.x + pnt->clip_rect.w-1
#define clip_ymin(pnt) pnt->clip_rect.y
#define clip_ymax(pnt) pnt->clip_rect.y + pnt->clip_rect.h-1
#else
#define clip_xmin(pnt) pnt->clip_minx
#define clip_xmax(pnt) pnt->clip_maxx
#define clip_ymin(pnt) pnt->clip_miny
#define clip_ymax(pnt) pnt->clip_maxy
#endif
void rubysdl_putPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
{
Uint8 *pix;
int shift;
if(x>=clip_xmin(surface) && x<=clip_xmax(surface) &&
y>=clip_ymin(surface) && y<=clip_ymax(surface)){
switch (surface->format->BytesPerPixel) {
case 1: /* Assuming 8-bpp */
*((Uint8 *)surface->pixels + y*surface->pitch + x) = color;
break;
case 2: /* Probably 15-bpp or 16-bpp */
*((Uint16 *)surface->pixels + y*surface->pitch/2 + x) = color;
break;
case 3: /* Slow 24-bpp mode, usually not used */
/* Gack - slow, but endian correct */
pix = (Uint8 *)surface->pixels + y * surface->pitch + x*3;
shift = surface->format->Rshift;
*(pix+shift/8) = color>>shift;
shift = surface->format->Gshift;
*(pix+shift/8) = color>>shift;
shift = surface->format->Bshift;
*(pix+shift/8) = color>>shift;
break;
case 4: /* Probably 32-bpp */
*((Uint32 *)surface->pixels + y*surface->pitch/4 + x) = color;
break;
}
}
}
Uint32 rubysdl_getPixel(SDL_Surface *surface, Sint16 x, Sint16 y)
{
Uint8 *pix;
int shift;
Uint32 color=0;
switch (surface->format->BytesPerPixel) {
case 1: /* Assuming 8-bpp */
return *((Uint8 *)surface->pixels + y*surface->pitch + x);
break;
case 2: /* Probably 15-bpp or 16-bpp */
return *((Uint16 *)surface->pixels + y*surface->pitch/2 + x);
break;
case 3: /* Slow 24-bpp mode, usually not used */
/* Does this work? */
pix = (Uint8 *)surface->pixels + y * surface->pitch + x*3;
shift = surface->format->Rshift;
color = *(pix+shift/8)>>shift;
shift = surface->format->Gshift;
color|= *(pix+shift/8)>>shift;
shift = surface->format->Bshift;
color|= *(pix+shift/8)>>shift;
return color;
break;
case 4: /* Probably 32-bpp */
return *((Uint32 *)surface->pixels + y*surface->pitch/4 + x);
break;
}
return 0;
}
#ifndef HAVE_SGE
static VALUE sdl_getPixel(VALUE obj,VALUE x,VALUE y)
{
SDL_Surface *surface;
Data_Get_Struct(obj,SDL_Surface,surface);
return UINT2NUM( rubysdl_getPixel(surface,NUM2INT(x),NUM2INT(y)) );
}
static VALUE sdl_putPixel(VALUE obj,VALUE x,VALUE y,VALUE color)
{
SDL_Surface *surface;
Data_Get_Struct(obj,SDL_Surface,surface);
rubysdl_putPixel(surface,NUM2INT(x),NUM2INT(y),VALUE2COLOR(color,surface->format));
return Qnil;
}
void init_pixel()
{
rb_define_method(cSurface,"getPixel",sdl_getPixel,2);
rb_define_method(cSurface,"putPixel",sdl_putPixel,3);
rb_define_method(cSurface,"[]",sdl_getPixel,2);
rb_define_method(cSurface,"[]=",sdl_putPixel,3);
}
#endif /* ifndef HAVE_SGE */
|
