Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 526:4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 11 Oct 2002 07:56:36 +0000 |
| parents | c97c1d3b3b5c |
| children | 5bb080d35049 |
| 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
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
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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; | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
53 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
54 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 55 okay = 0; |
| 56 } else { | |
| 57 dst_locked = 1; | |
| 58 } | |
| 59 } | |
| 60 /* Lock the source if it's in hardware */ | |
| 61 src_locked = 0; | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
62 if ( SDL_MUSTLOCK(src) ) { |
|
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
63 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 64 okay = 0; |
| 65 } else { | |
| 66 src_locked = 1; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 71 if ( okay && srcrect->w && srcrect->h ) { | |
| 72 SDL_BlitInfo info; | |
| 73 SDL_loblit RunBlit; | |
| 74 | |
| 75 /* Set up the blit information */ | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
76 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 77 (Uint16)srcrect->y*src->pitch + |
| 78 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 79 info.s_width = srcrect->w; | |
| 80 info.s_height = srcrect->h; | |
| 81 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
82 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 83 (Uint16)dstrect->y*dst->pitch + |
| 84 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 85 info.d_width = dstrect->w; | |
| 86 info.d_height = dstrect->h; | |
| 87 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 88 info.aux_data = src->map->sw_data->aux_data; | |
| 89 info.src = src->format; | |
| 90 info.table = src->map->table; | |
| 91 info.dst = dst->format; | |
| 92 RunBlit = src->map->sw_data->blit; | |
| 93 | |
| 94 /* Run the actual software blit */ | |
| 95 RunBlit(&info); | |
| 96 } | |
| 97 | |
| 98 /* We need to unlock the surfaces if they're locked */ | |
| 99 if ( dst_locked ) { | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
100 SDL_UnlockSurface(dst); |
|
310
c97c1d3b3b5c
Blit bug fix from John Popplewell
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
101 } |
| 0 | 102 if ( src_locked ) { |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
310
diff
changeset
|
103 SDL_UnlockSurface(src); |
| 0 | 104 } |
| 105 /* Blit is done! */ | |
| 106 return(okay ? 0 : -1); | |
| 107 } | |
| 108 | |
| 109 static void SDL_BlitCopy(SDL_BlitInfo *info) | |
| 110 { | |
| 111 Uint8 *src, *dst; | |
| 112 int w, h; | |
| 113 int srcskip, dstskip; | |
| 114 | |
| 115 w = info->d_width*info->dst->BytesPerPixel; | |
| 116 h = info->d_height; | |
| 117 src = info->s_pixels; | |
| 118 dst = info->d_pixels; | |
| 119 srcskip = w+info->s_skip; | |
| 120 dstskip = w+info->d_skip; | |
| 121 while ( h-- ) { | |
| 122 SDL_memcpy(dst, src, w); | |
| 123 src += srcskip; | |
| 124 dst += dstskip; | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 129 { | |
| 130 Uint8 *src, *dst; | |
| 131 int w, h; | |
| 132 int srcskip, dstskip; | |
| 133 | |
| 134 w = info->d_width*info->dst->BytesPerPixel; | |
| 135 h = info->d_height; | |
| 136 src = info->s_pixels; | |
| 137 dst = info->d_pixels; | |
| 138 srcskip = w+info->s_skip; | |
| 139 dstskip = w+info->d_skip; | |
| 140 if ( dst < src ) { | |
| 141 while ( h-- ) { | |
| 142 SDL_memcpy(dst, src, w); | |
| 143 src += srcskip; | |
| 144 dst += dstskip; | |
| 145 } | |
| 146 } else { | |
| 147 src += ((h-1) * srcskip); | |
| 148 dst += ((h-1) * dstskip); | |
| 149 while ( h-- ) { | |
| 150 SDL_revcpy(dst, src, w); | |
| 151 src -= srcskip; | |
| 152 dst -= dstskip; | |
| 153 } | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 /* Figure out which of many blit routines to set up on a surface */ | |
| 158 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 159 { | |
| 160 int blit_index; | |
| 161 | |
| 162 /* Clean everything out to start */ | |
| 163 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 164 SDL_UnRLESurface(surface, 1); | |
| 165 } | |
| 166 surface->map->sw_blit = NULL; | |
| 167 | |
| 168 /* Figure out if an accelerated hardware blit is possible */ | |
| 169 surface->flags &= ~SDL_HWACCEL; | |
| 170 if ( surface->map->identity ) { | |
| 171 int hw_blit_ok; | |
| 172 | |
| 173 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 174 /* We only support accelerated blitting to hardware */ | |
| 175 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 176 hw_blit_ok = current_video->info.blit_hw; | |
| 177 } else { | |
| 178 hw_blit_ok = 0; | |
| 179 } | |
| 180 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 181 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 182 } | |
| 183 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 184 hw_blit_ok = current_video->info.blit_hw_A; | |
| 185 } | |
| 186 } else { | |
| 187 /* We only support accelerated blitting to hardware */ | |
| 188 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 189 hw_blit_ok = current_video->info.blit_sw; | |
| 190 } else { | |
| 191 hw_blit_ok = 0; | |
| 192 } | |
| 193 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 194 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 195 } | |
| 196 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 197 hw_blit_ok = current_video->info.blit_sw_A; | |
| 198 } | |
| 199 } | |
| 200 if ( hw_blit_ok ) { | |
| 201 SDL_VideoDevice *video = current_video; | |
| 202 SDL_VideoDevice *this = current_video; | |
| 203 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 204 } | |
| 205 } | |
| 206 | |
| 207 /* Get the blit function index, based on surface mode */ | |
| 208 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 209 blit_index = 0; | |
| 210 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 211 if ( surface->flags & SDL_SRCALPHA | |
| 212 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 213 || surface->format->Amask) ) { | |
| 214 blit_index |= 2; | |
| 215 } | |
| 216 | |
| 217 /* Check for special "identity" case -- copy blit */ | |
| 218 if ( surface->map->identity && blit_index == 0 ) { | |
| 219 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 220 | |
| 221 /* Handle overlapping blits on the same surface */ | |
| 222 if ( surface == surface->map->dst ) { | |
| 223 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 224 } | |
| 225 } else { | |
| 226 if ( surface->format->BitsPerPixel < 8 ) { | |
| 227 surface->map->sw_data->blit = | |
| 228 SDL_CalculateBlit0(surface, blit_index); | |
| 229 } else { | |
| 230 switch ( surface->format->BytesPerPixel ) { | |
| 231 case 1: | |
| 232 surface->map->sw_data->blit = | |
| 233 SDL_CalculateBlit1(surface, blit_index); | |
| 234 break; | |
| 235 case 2: | |
| 236 case 3: | |
| 237 case 4: | |
| 238 surface->map->sw_data->blit = | |
| 239 SDL_CalculateBlitN(surface, blit_index); | |
| 240 break; | |
| 241 default: | |
| 242 surface->map->sw_data->blit = NULL; | |
| 243 break; | |
| 244 } | |
| 245 } | |
| 246 } | |
| 247 /* Make sure we have a blit function */ | |
| 248 if ( surface->map->sw_data->blit == NULL ) { | |
| 249 SDL_InvalidateMap(surface->map); | |
| 250 SDL_SetError("Blit combination not supported"); | |
| 251 return(-1); | |
| 252 } | |
| 253 | |
| 254 /* Choose software blitting function */ | |
| 255 if(surface->flags & SDL_RLEACCELOK | |
| 256 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 257 | |
| 258 if(surface->map->identity | |
| 259 && (blit_index == 1 | |
| 260 || (blit_index == 3 && !surface->format->Amask))) { | |
| 261 if ( SDL_RLESurface(surface) == 0 ) | |
| 262 surface->map->sw_blit = SDL_RLEBlit; | |
| 263 } else if(blit_index == 2 && surface->format->Amask) { | |
| 264 if ( SDL_RLESurface(surface) == 0 ) | |
| 265 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 if ( surface->map->sw_blit == NULL ) { | |
| 270 surface->map->sw_blit = SDL_SoftBlit; | |
| 271 } | |
| 272 return(0); | |
| 273 } | |
| 274 |