Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 293:585a7e1285ae
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 05 Mar 2002 23:19:37 +0000 |
| parents | e8157fcb3114 |
| children | f6ffac90895c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 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
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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); | |
| 119 } else | |
| 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 |