Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.c @ 934:af585d6efec8
Date: Thu, 17 Jun 2004 11:38:51 -0700 (PDT)
From: Eric Wing <ewing2121@yahoo.com>
Subject: New OS X patch (was Re: [SDL] Bug with inverted mouse coordinates in
I have a new patch for OS X I would like to submit.
First, it appears no further action has been taken on
my fix from Apple on the OpenGL windowed mode mouse
inversion problem. The fix would reunify the code, and
no longer require case checking for which version of
the OS you are running. This is probably a good fix
because the behavior with the old code could change
again with future versions of the OS, so those fixes
are included in this new patch.
But in addition, when I was at Apple, I asked them
about the ability to distinguish between the modifier
keys on the left and right sides of the keyboard (e.g.
Left Shift, Right Shift, Left/Right Alt, L/R Cmd, L/R
Ctrl). They told me that starting with Panther, the OS
began supporting this feature. This has always been a
source of annoyance for me when bringing a program
that comes from Windows or Linux to OS X when the
keybindings happened to need distinguishable left-side
and right-side keys. So the rest of the patch I am
submitting contains new code to support this feature
on Panther (and presumably later versions of the OS).
So after removing the OS version checks for the mouse
inversion problem, I reused the OS version checks to
activate the Left/Right detection of modifier keys. If
you are running Panther (or above), the new code will
attempt to distinguish between sides. For the older
OS's, the code path reverts to the original code.
I've tested with Panther on a G4 Cube, G5 dual
processor, and Powerbook Rev C. The Cube and G5
keyboards demonstrated the ability to distinguish
between sides. The Powerbook seems to only have
left-side keys, but the patch was still able to handle
it by producing the same results as before the patch.
I also wanted to test a non-Apple keyboard.
Unfortunately, I don't have any PC USB keyboards.
However, I was able to borrow a Sun Microsystems USB
keyboard, so I tried that out on the G5, and I got the
correct behavior for left and right sides. I'm
expecting that if it worked with a Sun keyboard, most
other keyboards should work with no problems.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 20 Aug 2004 22:35:23 +0000 |
| parents | 9301b429c99f |
| children | 68f607298ca9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 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 | |
|
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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 | |
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40 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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41 #define MMX_ASMBLIT |
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42 #endif |
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43 |
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44 #if defined(MMX_ASMBLIT) |
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45 #include "SDL_cpuinfo.h" |
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46 #include "mmx.h" |
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47 #endif |
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48 |
| 0 | 49 /* The general purpose software blit routine */ |
| 50 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 51 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 52 { | |
| 53 int okay; | |
| 54 int src_locked; | |
| 55 int dst_locked; | |
| 56 | |
| 57 /* Everything is okay at the beginning... */ | |
| 58 okay = 1; | |
| 59 | |
| 60 /* Lock the destination if it's in hardware */ | |
| 61 dst_locked = 0; | |
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62 if ( SDL_MUSTLOCK(dst) ) { |
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63 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 64 okay = 0; |
| 65 } else { | |
| 66 dst_locked = 1; | |
| 67 } | |
| 68 } | |
| 69 /* Lock the source if it's in hardware */ | |
| 70 src_locked = 0; | |
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71 if ( SDL_MUSTLOCK(src) ) { |
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72 if ( SDL_LockSurface(src) < 0 ) { |
| 0 | 73 okay = 0; |
| 74 } else { | |
| 75 src_locked = 1; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 /* Set up source and destination buffer pointers, and BLIT! */ | |
| 80 if ( okay && srcrect->w && srcrect->h ) { | |
| 81 SDL_BlitInfo info; | |
| 82 SDL_loblit RunBlit; | |
| 83 | |
| 84 /* Set up the blit information */ | |
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85 info.s_pixels = (Uint8 *)src->pixels + |
| 0 | 86 (Uint16)srcrect->y*src->pitch + |
| 87 (Uint16)srcrect->x*src->format->BytesPerPixel; | |
| 88 info.s_width = srcrect->w; | |
| 89 info.s_height = srcrect->h; | |
| 90 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; | |
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91 info.d_pixels = (Uint8 *)dst->pixels + |
| 0 | 92 (Uint16)dstrect->y*dst->pitch + |
| 93 (Uint16)dstrect->x*dst->format->BytesPerPixel; | |
| 94 info.d_width = dstrect->w; | |
| 95 info.d_height = dstrect->h; | |
| 96 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; | |
| 97 info.aux_data = src->map->sw_data->aux_data; | |
| 98 info.src = src->format; | |
| 99 info.table = src->map->table; | |
| 100 info.dst = dst->format; | |
| 101 RunBlit = src->map->sw_data->blit; | |
| 102 | |
| 103 /* Run the actual software blit */ | |
| 104 RunBlit(&info); | |
| 105 } | |
| 106 | |
| 107 /* We need to unlock the surfaces if they're locked */ | |
| 108 if ( dst_locked ) { | |
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109 SDL_UnlockSurface(dst); |
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110 } |
| 0 | 111 if ( src_locked ) { |
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112 SDL_UnlockSurface(src); |
| 0 | 113 } |
| 114 /* Blit is done! */ | |
| 115 return(okay ? 0 : -1); | |
| 116 } | |
| 117 | |
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118 #ifdef MMX_ASMBLIT |
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119 static __inline__ void SDL_memcpyMMX(char* to,char* from,int len) |
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120 { |
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121 int i; |
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122 |
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123 for(i=0; i<len/8; i++) { |
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124 __asm__ __volatile__ ( |
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125 " movq (%0), %%mm0\n" |
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126 " movq %%mm0, (%1)\n" |
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127 : : "r" (from), "r" (to) : "memory"); |
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128 from+=8; |
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129 to+=8; |
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130 } |
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131 if (len&7) |
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132 SDL_memcpy(to, from, len&7); |
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133 } |
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134 |
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135 static __inline__ void SDL_memcpySSE(char* to,char* from,int len) |
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136 { |
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137 int i; |
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138 |
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139 __asm__ __volatile__ ( |
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140 " prefetchnta (%0)\n" |
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141 " prefetchnta 64(%0)\n" |
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142 " prefetchnta 128(%0)\n" |
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143 " prefetchnta 192(%0)\n" |
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144 : : "r" (from) ); |
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145 |
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146 for(i=0; i<len/8; i++) { |
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147 __asm__ __volatile__ ( |
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148 " prefetchnta 256(%0)\n" |
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149 " movq (%0), %%mm0\n" |
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150 " movntq %%mm0, (%1)\n" |
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151 : : "r" (from), "r" (to) : "memory"); |
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152 from+=8; |
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153 to+=8; |
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154 } |
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155 if (len&7) |
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156 SDL_memcpy(to, from, len&7); |
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157 } |
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158 #endif |
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159 |
| 0 | 160 static void SDL_BlitCopy(SDL_BlitInfo *info) |
| 161 { | |
| 162 Uint8 *src, *dst; | |
| 163 int w, h; | |
| 164 int srcskip, dstskip; | |
| 165 | |
| 166 w = info->d_width*info->dst->BytesPerPixel; | |
| 167 h = info->d_height; | |
| 168 src = info->s_pixels; | |
| 169 dst = info->d_pixels; | |
| 170 srcskip = w+info->s_skip; | |
| 171 dstskip = w+info->d_skip; | |
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172 #ifdef MMX_ASMBLIT |
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173 if(SDL_HasSSE()) |
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174 { |
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175 while ( h-- ) { |
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176 SDL_memcpySSE(dst, src, w); |
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177 src += srcskip; |
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178 dst += dstskip; |
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179 } |
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180 __asm__ __volatile__ ( |
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181 " emms\n" |
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182 ::); |
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183 } |
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184 else |
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185 if(SDL_HasMMX()) |
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186 { |
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187 while ( h-- ) { |
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188 SDL_memcpyMMX(dst, src, w); |
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189 src += srcskip; |
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190 dst += dstskip; |
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191 } |
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192 __asm__ __volatile__ ( |
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193 " emms\n" |
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194 ::); |
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195 } |
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196 else |
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197 #endif |
| 0 | 198 while ( h-- ) { |
| 199 SDL_memcpy(dst, src, w); | |
| 200 src += srcskip; | |
| 201 dst += dstskip; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) | |
| 206 { | |
| 207 Uint8 *src, *dst; | |
| 208 int w, h; | |
| 209 int srcskip, dstskip; | |
| 210 | |
| 211 w = info->d_width*info->dst->BytesPerPixel; | |
| 212 h = info->d_height; | |
| 213 src = info->s_pixels; | |
| 214 dst = info->d_pixels; | |
| 215 srcskip = w+info->s_skip; | |
| 216 dstskip = w+info->d_skip; | |
| 217 if ( dst < src ) { | |
| 218 while ( h-- ) { | |
| 219 SDL_memcpy(dst, src, w); | |
| 220 src += srcskip; | |
| 221 dst += dstskip; | |
| 222 } | |
| 223 } else { | |
| 224 src += ((h-1) * srcskip); | |
| 225 dst += ((h-1) * dstskip); | |
| 226 while ( h-- ) { | |
| 227 SDL_revcpy(dst, src, w); | |
| 228 src -= srcskip; | |
| 229 dst -= dstskip; | |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 /* Figure out which of many blit routines to set up on a surface */ | |
| 235 int SDL_CalculateBlit(SDL_Surface *surface) | |
| 236 { | |
| 237 int blit_index; | |
| 238 | |
| 239 /* Clean everything out to start */ | |
| 240 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 241 SDL_UnRLESurface(surface, 1); | |
| 242 } | |
| 243 surface->map->sw_blit = NULL; | |
| 244 | |
| 245 /* Figure out if an accelerated hardware blit is possible */ | |
| 246 surface->flags &= ~SDL_HWACCEL; | |
| 247 if ( surface->map->identity ) { | |
| 248 int hw_blit_ok; | |
| 249 | |
| 250 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 251 /* We only support accelerated blitting to hardware */ | |
| 252 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 253 hw_blit_ok = current_video->info.blit_hw; | |
| 254 } else { | |
| 255 hw_blit_ok = 0; | |
| 256 } | |
| 257 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 258 hw_blit_ok = current_video->info.blit_hw_CC; | |
| 259 } | |
| 260 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 261 hw_blit_ok = current_video->info.blit_hw_A; | |
| 262 } | |
| 263 } else { | |
| 264 /* We only support accelerated blitting to hardware */ | |
| 265 if ( surface->map->dst->flags & SDL_HWSURFACE ) { | |
| 266 hw_blit_ok = current_video->info.blit_sw; | |
| 267 } else { | |
| 268 hw_blit_ok = 0; | |
| 269 } | |
| 270 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { | |
| 271 hw_blit_ok = current_video->info.blit_sw_CC; | |
| 272 } | |
| 273 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { | |
| 274 hw_blit_ok = current_video->info.blit_sw_A; | |
| 275 } | |
| 276 } | |
| 277 if ( hw_blit_ok ) { | |
| 278 SDL_VideoDevice *video = current_video; | |
| 279 SDL_VideoDevice *this = current_video; | |
| 280 video->CheckHWBlit(this, surface, surface->map->dst); | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 /* Get the blit function index, based on surface mode */ | |
| 285 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ | |
| 286 blit_index = 0; | |
| 287 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; | |
| 288 if ( surface->flags & SDL_SRCALPHA | |
| 289 && (surface->format->alpha != SDL_ALPHA_OPAQUE | |
| 290 || surface->format->Amask) ) { | |
| 291 blit_index |= 2; | |
| 292 } | |
| 293 | |
| 294 /* Check for special "identity" case -- copy blit */ | |
| 295 if ( surface->map->identity && blit_index == 0 ) { | |
| 296 surface->map->sw_data->blit = SDL_BlitCopy; | |
| 297 | |
| 298 /* Handle overlapping blits on the same surface */ | |
| 299 if ( surface == surface->map->dst ) { | |
| 300 surface->map->sw_data->blit = SDL_BlitCopyOverlap; | |
| 301 } | |
| 302 } else { | |
| 303 if ( surface->format->BitsPerPixel < 8 ) { | |
| 304 surface->map->sw_data->blit = | |
| 305 SDL_CalculateBlit0(surface, blit_index); | |
| 306 } else { | |
| 307 switch ( surface->format->BytesPerPixel ) { | |
| 308 case 1: | |
| 309 surface->map->sw_data->blit = | |
| 310 SDL_CalculateBlit1(surface, blit_index); | |
| 311 break; | |
| 312 case 2: | |
| 313 case 3: | |
| 314 case 4: | |
| 315 surface->map->sw_data->blit = | |
| 316 SDL_CalculateBlitN(surface, blit_index); | |
| 317 break; | |
| 318 default: | |
| 319 surface->map->sw_data->blit = NULL; | |
| 320 break; | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 /* Make sure we have a blit function */ | |
| 325 if ( surface->map->sw_data->blit == NULL ) { | |
| 326 SDL_InvalidateMap(surface->map); | |
| 327 SDL_SetError("Blit combination not supported"); | |
| 328 return(-1); | |
| 329 } | |
| 330 | |
| 331 /* Choose software blitting function */ | |
| 332 if(surface->flags & SDL_RLEACCELOK | |
| 333 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { | |
| 334 | |
| 335 if(surface->map->identity | |
| 336 && (blit_index == 1 | |
| 337 || (blit_index == 3 && !surface->format->Amask))) { | |
| 338 if ( SDL_RLESurface(surface) == 0 ) | |
| 339 surface->map->sw_blit = SDL_RLEBlit; | |
| 340 } else if(blit_index == 2 && surface->format->Amask) { | |
| 341 if ( SDL_RLESurface(surface) == 0 ) | |
| 342 surface->map->sw_blit = SDL_RLEAlphaBlit; | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 if ( surface->map->sw_blit == NULL ) { | |
| 347 surface->map->sw_blit = SDL_SoftBlit; | |
| 348 } | |
| 349 return(0); | |
| 350 } | |
| 351 |