This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_blendrect.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
25
#include "SDL_draw.h"
27
28
29
static int
SDL_BlendRect_RGB555(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
31
32
33
34
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
35
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
36
37
break;
case SDL_BLENDMODE_ADD:
38
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
39
40
break;
case SDL_BLENDMODE_MOD:
41
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
42
43
break;
default:
44
FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
47
48
return 0;
}
50
51
52
53
54
55
56
57
static int
SDL_BlendRect_RGB565(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
58
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
59
60
break;
case SDL_BLENDMODE_ADD:
61
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
62
63
break;
case SDL_BLENDMODE_MOD:
64
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
65
66
break;
default:
67
FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
70
71
return 0;
}
73
74
75
76
77
78
79
80
static int
SDL_BlendRect_RGB888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
81
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
82
83
break;
case SDL_BLENDMODE_ADD:
84
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
85
86
break;
case SDL_BLENDMODE_MOD:
87
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
88
89
break;
default:
90
FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
93
94
95
return 0;
}
96
97
98
99
100
101
102
103
static int
SDL_BlendRect_ARGB8888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
104
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
105
106
break;
case SDL_BLENDMODE_ADD:
107
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
108
109
break;
case SDL_BLENDMODE_MOD:
110
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
111
112
break;
default:
113
FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
114
115
116
117
118
break;
}
return 0;
}
119
120
121
122
123
124
125
126
127
static int
SDL_BlendRect_RGB(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 2:
128
129
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
130
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
131
132
break;
case SDL_BLENDMODE_ADD:
133
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
134
135
break;
case SDL_BLENDMODE_MOD:
136
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
137
138
break;
default:
139
FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
140
141
break;
}
142
143
return 0;
case 4:
144
145
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
146
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
147
148
break;
case SDL_BLENDMODE_ADD:
149
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
150
151
break;
case SDL_BLENDMODE_MOD:
152
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
153
154
break;
default:
155
FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
156
157
break;
}
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
return 0;
default:
SDL_Unsupported();
return -1;
}
}
static int
SDL_BlendRect_RGBA(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 4:
174
175
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
176
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
177
178
break;
case SDL_BLENDMODE_ADD:
179
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
180
181
break;
case SDL_BLENDMODE_MOD:
182
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
183
184
break;
default:
185
FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
186
187
break;
}
188
return 0;
189
190
191
192
default:
SDL_Unsupported();
return -1;
}
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
}
int
SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
/* This function doesn't work on surfaces < 8 bpp */
if (fmt->BitsPerPixel < 8) {
SDL_SetError("SDL_BlendRect(): Unsupported surface format");
return (-1);
}
/* If 'dstrect' == NULL, then fill the whole surface */
if (dstrect) {
/* Perform clipping */
if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
return (0);
}
} else {
dstrect = &dst->clip_rect;
}
if ((blendMode == SDL_BLENDMODE_BLEND)
|| (blendMode == SDL_BLENDMODE_ADD)) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
switch (fmt->BitsPerPixel) {
case 15:
switch (fmt->Rmask) {
case 0x7C00:
return SDL_BlendRect_RGB555(dst, dstrect, blendMode, r, g, b, a);
}
break;
case 16:
switch (fmt->Rmask) {
case 0xF800:
return SDL_BlendRect_RGB565(dst, dstrect, blendMode, r, g, b, a);
}
break;
case 32:
switch (fmt->Rmask) {
case 0x00FF0000:
if (!fmt->Amask) {
return SDL_BlendRect_RGB888(dst, dstrect, blendMode, r, g, b,
a);
243
244
245
} else {
return SDL_BlendRect_ARGB8888(dst, dstrect, blendMode, r, g,
b, a);
246
247
248
249
250
251
252
253
254
255
256
257
}
break;
}
default:
break;
}
if (!fmt->Amask) {
return SDL_BlendRect_RGB(dst, dstrect, blendMode, r, g, b, a);
} else {
return SDL_BlendRect_RGBA(dst, dstrect, blendMode, r, g, b, a);
}
258
259
260
}
/* vi: set ts=4 sw=4 expandtab: */