Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 453:a6fa62b1be09
Updated for embedded Visual C++ 4.0
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Tue, 20 Aug 2002 00:20:06 +0000 |
parents | c97c1d3b3b5c |
children | 4314a501d7be |
rev | line source |
---|---|
0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 #include <stdio.h> | |
29 #include <stdlib.h> | |
30 #include <string.h> | |
31 | |
32 #include "SDL_error.h" | |
33 #include "SDL_video.h" | |
34 #include "SDL_sysvideo.h" | |
35 #include "SDL_blit.h" | |
36 #include "SDL_RLEaccel_c.h" | |
37 #include "SDL_pixels_c.h" | |
38 #include "SDL_memops.h" | |
39 | |
40 /* The general purpose software blit routine */ | |
41 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
42 SDL_Surface *dst, SDL_Rect *dstrect) | |
43 { | |
44 int okay; | |
45 int src_locked; | |
46 int dst_locked; | |
47 | |
48 /* Everything is okay at the beginning... */ | |
49 okay = 1; | |
50 | |
51 /* Lock the destination if it's in hardware */ | |
52 dst_locked = 0; | |
53 if ( dst->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
54 SDL_VideoDevice *video = current_video; | |
55 SDL_VideoDevice *this = current_video; | |
56 if ( video->LockHWSurface(this, dst) < 0 ) { | |
57 okay = 0; | |
58 } else { | |
59 dst_locked = 1; | |
60 } | |
61 } | |
62 /* Lock the source if it's in hardware */ | |
63 src_locked = 0; | |
64 if ( src->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
65 SDL_VideoDevice *video = current_video; | |
66 SDL_VideoDevice *this = current_video; | |
67 if ( video->LockHWSurface(this, src) < 0 ) { | |
68 okay = 0; | |
69 } else { | |
70 src_locked = 1; | |
71 } | |
72 } | |
73 | |
74 /* Unencode the destination if it's RLE encoded */ | |
75 if ( dst->flags & SDL_RLEACCEL ) { | |
76 SDL_UnRLESurface(dst, 1); | |
77 dst->flags |= SDL_RLEACCEL; /* save accel'd state */ | |
78 } | |
79 | |
80 /* Set up source and destination buffer pointers, and BLIT! */ | |
81 if ( okay && srcrect->w && srcrect->h ) { | |
82 SDL_BlitInfo info; | |
83 SDL_loblit RunBlit; | |
84 | |
85 /* Set up the blit information */ | |
86 info.s_pixels = (Uint8 *)src->pixels + src->offset + | |
87 (Uint16)srcrect->y*src->pitch + | |
88 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
89 info.s_width = srcrect->w; | |
90 info.s_height = srcrect->h; | |
91 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
92 info.d_pixels = (Uint8 *)dst->pixels + dst->offset + | |
93 (Uint16)dstrect->y*dst->pitch + | |
94 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
95 info.d_width = dstrect->w; | |
96 info.d_height = dstrect->h; | |
97 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
98 info.aux_data = src->map->sw_data->aux_data; | |
99 info.src = src->format; | |
100 info.table = src->map->table; | |
101 info.dst = dst->format; | |
102 RunBlit = src->map->sw_data->blit; | |
103 | |
104 /* Run the actual software blit */ | |
105 RunBlit(&info); | |
106 } | |
107 | |
108 /* Re-encode the destination if it's RLE encoded */ | |
109 if ( dst->flags & SDL_RLEACCEL ) { | |
110 dst->flags &= ~SDL_RLEACCEL; /* stop lying */ | |
111 SDL_RLESurface(dst); | |
112 } | |
113 | |
114 /* We need to unlock the surfaces if they're locked */ | |
115 if ( dst_locked ) { | |
116 SDL_VideoDevice *video = current_video; | |
117 SDL_VideoDevice *this = current_video; | |
118 video->UnlockHWSurface(this, dst); | |
310
c97c1d3b3b5c
Blit bug fix from John Popplewell
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
119 } |
0 | 120 if ( src_locked ) { |
121 SDL_VideoDevice *video = current_video; | |
122 SDL_VideoDevice *this = current_video; | |
123 video->UnlockHWSurface(this, src); | |
124 } | |
125 /* Blit is done! */ | |
126 return(okay ? 0 : -1); | |
127 } | |
128 | |
129 static void SDL_BlitCopy(SDL_BlitInfo *info) | |
130 { | |
131 Uint8 *src, *dst; | |
132 int w, h; | |
133 int srcskip, dstskip; | |
134 | |
135 w = info->d_width*info->dst->BytesPerPixel; | |
136 h = info->d_height; | |
137 src = info->s_pixels; | |
138 dst = info->d_pixels; | |
139 srcskip = w+info->s_skip; | |
140 dstskip = w+info->d_skip; | |
141 while ( h-- ) { | |
142 SDL_memcpy(dst, src, w); | |
143 src += srcskip; | |
144 dst += dstskip; | |
145 } | |
146 } | |
147 | |
148 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
149 { | |
150 Uint8 *src, *dst; | |
151 int w, h; | |
152 int srcskip, dstskip; | |
153 | |
154 w = info->d_width*info->dst->BytesPerPixel; | |
155 h = info->d_height; | |
156 src = info->s_pixels; | |
157 dst = info->d_pixels; | |
158 srcskip = w+info->s_skip; | |
159 dstskip = w+info->d_skip; | |
160 if ( dst < src ) { | |
161 while ( h-- ) { | |
162 SDL_memcpy(dst, src, w); | |
163 src += srcskip; | |
164 dst += dstskip; | |
165 } | |
166 } else { | |
167 src += ((h-1) * srcskip); | |
168 dst += ((h-1) * dstskip); | |
169 while ( h-- ) { | |
170 SDL_revcpy(dst, src, w); | |
171 src -= srcskip; | |
172 dst -= dstskip; | |
173 } | |
174 } | |
175 } | |
176 | |
177 /* Figure out which of many blit routines to set up on a surface */ | |
178 int SDL_CalculateBlit(SDL_Surface *surface) | |
179 { | |
180 int blit_index; | |
181 | |
182 /* Clean everything out to start */ | |
183 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
184 SDL_UnRLESurface(surface, 1); | |
185 } | |
186 surface->map->sw_blit = NULL; | |
187 | |
188 /* Figure out if an accelerated hardware blit is possible */ | |
189 surface->flags &= ~SDL_HWACCEL; | |
190 if ( surface->map->identity ) { | |
191 int hw_blit_ok; | |
192 | |
193 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
194 /* We only support accelerated blitting to hardware */ | |
195 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
196 hw_blit_ok = current_video->info.blit_hw; | |
197 } else { | |
198 hw_blit_ok = 0; | |
199 } | |
200 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
201 hw_blit_ok = current_video->info.blit_hw_CC; | |
202 } | |
203 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
204 hw_blit_ok = current_video->info.blit_hw_A; | |
205 } | |
206 } else { | |
207 /* We only support accelerated blitting to hardware */ | |
208 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
209 hw_blit_ok = current_video->info.blit_sw; | |
210 } else { | |
211 hw_blit_ok = 0; | |
212 } | |
213 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
214 hw_blit_ok = current_video->info.blit_sw_CC; | |
215 } | |
216 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
217 hw_blit_ok = current_video->info.blit_sw_A; | |
218 } | |
219 } | |
220 if ( hw_blit_ok ) { | |
221 SDL_VideoDevice *video = current_video; | |
222 SDL_VideoDevice *this = current_video; | |
223 video->CheckHWBlit(this, surface, surface->map->dst); | |
224 } | |
225 } | |
226 | |
227 /* Get the blit function index, based on surface mode */ | |
228 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
229 blit_index = 0; | |
230 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
231 if ( surface->flags & SDL_SRCALPHA | |
232 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
233 || surface->format->Amask) ) { | |
234 blit_index |= 2; | |
235 } | |
236 | |
237 /* Check for special "identity" case -- copy blit */ | |
238 if ( surface->map->identity && blit_index == 0 ) { | |
239 surface->map->sw_data->blit = SDL_BlitCopy; | |
240 | |
241 /* Handle overlapping blits on the same surface */ | |
242 if ( surface == surface->map->dst ) { | |
243 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
244 } | |
245 } else { | |
246 if ( surface->format->BitsPerPixel < 8 ) { | |
247 surface->map->sw_data->blit = | |
248 SDL_CalculateBlit0(surface, blit_index); | |
249 } else { | |
250 switch ( surface->format->BytesPerPixel ) { | |
251 case 1: | |
252 surface->map->sw_data->blit = | |
253 SDL_CalculateBlit1(surface, blit_index); | |
254 break; | |
255 case 2: | |
256 case 3: | |
257 case 4: | |
258 surface->map->sw_data->blit = | |
259 SDL_CalculateBlitN(surface, blit_index); | |
260 break; | |
261 default: | |
262 surface->map->sw_data->blit = NULL; | |
263 break; | |
264 } | |
265 } | |
266 } | |
267 /* Make sure we have a blit function */ | |
268 if ( surface->map->sw_data->blit == NULL ) { | |
269 SDL_InvalidateMap(surface->map); | |
270 SDL_SetError("Blit combination not supported"); | |
271 return(-1); | |
272 } | |
273 | |
274 /* Choose software blitting function */ | |
275 if(surface->flags & SDL_RLEACCELOK | |
276 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
277 | |
278 if(surface->map->identity | |
279 && (blit_index == 1 | |
280 || (blit_index == 3 && !surface->format->Amask))) { | |
281 if ( SDL_RLESurface(surface) == 0 ) | |
282 surface->map->sw_blit = SDL_RLEBlit; | |
283 } else if(blit_index == 2 && surface->format->Amask) { | |
284 if ( SDL_RLESurface(surface) == 0 ) | |
285 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
286 } | |
287 } | |
288 | |
289 if ( surface->map->sw_blit == NULL ) { | |
290 surface->map->sw_blit = SDL_SoftBlit; | |
291 } | |
292 return(0); | |
293 } | |
294 |