Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit.h @ 1614:6162b8d921ce
Date: Wed, 29 Mar 2006 17:26:55 +0200 CEST
From: "Fran���is Revol"
Subject: [SDL] BeOS port fix: PrintScreen key crashing
It seems the latest SDL crashes when someone hits the PrtScrn key in
ZETA (BeOS R6), somewhere it gets a negative value as key code (or a
big unsigned maybe ?), and uses it as an index in the keysym table...
I'll investigate the cause for the negative value, but it's always
better to check for bounds correctly when indexing a table. The
attached diff fixes it.
Fran���is Revol
--
Software Architect
yellowTAB GmbH
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 31 Mar 2006 06:16:20 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb 8582c6a5ca16 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #ifndef _SDL_blit_h | |
| 25 #define _SDL_blit_h | |
| 26 | |
| 27 #include "SDL_endian.h" | |
| 28 | |
| 29 /* The structure passed to the low level blit functions */ | |
| 30 typedef struct { | |
| 31 Uint8 *s_pixels; | |
| 32 int s_width; | |
| 33 int s_height; | |
| 34 int s_skip; | |
| 35 Uint8 *d_pixels; | |
| 36 int d_width; | |
| 37 int d_height; | |
| 38 int d_skip; | |
| 39 void *aux_data; | |
| 40 SDL_PixelFormat *src; | |
| 41 Uint8 *table; | |
| 42 SDL_PixelFormat *dst; | |
| 43 } SDL_BlitInfo; | |
| 44 | |
| 45 /* The type definition for the low level blit functions */ | |
| 46 typedef void (*SDL_loblit)(SDL_BlitInfo *info); | |
| 47 | |
| 48 /* This is the private info structure for software accelerated blits */ | |
| 49 struct private_swaccel { | |
| 50 SDL_loblit blit; | |
| 51 void *aux_data; | |
| 52 }; | |
| 53 | |
| 54 /* Blit mapping definition */ | |
| 55 typedef struct SDL_BlitMap { | |
| 56 SDL_Surface *dst; | |
| 57 int identity; | |
| 58 Uint8 *table; | |
| 59 SDL_blit hw_blit; | |
| 60 SDL_blit sw_blit; | |
| 61 struct private_hwaccel *hw_data; | |
| 62 struct private_swaccel *sw_data; | |
| 63 | |
| 64 /* the version count matches the destination; mismatch indicates | |
| 65 an invalid mapping */ | |
| 66 unsigned int format_version; | |
| 67 } SDL_BlitMap; | |
| 68 | |
| 69 | |
| 70 /* Functions found in SDL_blit.c */ | |
| 71 extern int SDL_CalculateBlit(SDL_Surface *surface); | |
| 72 | |
| 73 /* Functions found in SDL_blit_{0,1,N,A}.c */ | |
| 74 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex); | |
| 75 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex); | |
| 76 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex); | |
| 77 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex); | |
| 78 | |
| 79 /* | |
| 80 * Useful macros for blitting routines | |
| 81 */ | |
| 82 | |
| 83 #define FORMAT_EQUAL(A, B) \ | |
| 84 ((A)->BitsPerPixel == (B)->BitsPerPixel \ | |
| 85 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) | |
| 86 | |
| 87 /* Load pixel of the specified format from a buffer and get its R-G-B values */ | |
| 88 /* FIXME: rescale values to 0..255 here? */ | |
|
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89 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| 0 | 90 { \ |
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91 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
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92 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
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93 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
| 0 | 94 } |
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95 #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| 0 | 96 { \ |
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97 r = (((Pixel&0xF800)>>11)<<3); \ |
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98 g = (((Pixel&0x07E0)>>5)<<2); \ |
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99 b = ((Pixel&0x001F)<<3); \ |
| 0 | 100 } |
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101 #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| 0 | 102 { \ |
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103 r = (((Pixel&0x7C00)>>10)<<3); \ |
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104 g = (((Pixel&0x03E0)>>5)<<3); \ |
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105 b = ((Pixel&0x001F)<<3); \ |
| 0 | 106 } |
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107 #define RGB_FROM_RGB888(Pixel, r, g, b) \ |
| 0 | 108 { \ |
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109 r = ((Pixel&0xFF0000)>>16); \ |
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110 g = ((Pixel&0xFF00)>>8); \ |
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111 b = (Pixel&0xFF); \ |
| 0 | 112 } |
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113 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| 0 | 114 do { \ |
| 115 switch (bpp) { \ | |
| 116 case 2: \ | |
|
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117 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 118 break; \ |
| 119 \ | |
| 120 case 3: { \ | |
| 121 Uint8 *B = (Uint8 *)(buf); \ | |
| 122 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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123 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 124 } else { \ |
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125 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 126 } \ |
| 127 } \ | |
| 128 break; \ | |
| 129 \ | |
| 130 case 4: \ | |
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131 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 132 break; \ |
| 133 \ | |
| 134 default: \ | |
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135 Pixel = 0; /* appease gcc */ \ |
| 0 | 136 break; \ |
| 137 } \ | |
| 138 } while(0) | |
| 139 | |
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140 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| 0 | 141 do { \ |
| 142 switch (bpp) { \ | |
| 143 case 2: \ | |
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144 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 145 break; \ |
| 146 \ | |
| 147 case 3: { \ | |
| 148 Uint8 *B = (Uint8 *)buf; \ | |
| 149 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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150 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
| 0 | 151 } else { \ |
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152 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
| 0 | 153 } \ |
| 154 } \ | |
| 155 break; \ | |
| 156 \ | |
| 157 case 4: \ | |
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158 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 159 break; \ |
| 160 \ | |
| 161 default: \ | |
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162 Pixel = 0; /* prevent gcc from complaining */ \ |
| 0 | 163 break; \ |
| 164 } \ | |
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165 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| 0 | 166 } while(0) |
| 167 | |
| 168 /* Assemble R-G-B values into a specified pixel format and store them */ | |
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169 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| 0 | 170 { \ |
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171 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 172 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 173 ((b>>fmt->Bloss)<<fmt->Bshift); \ | |
| 174 } | |
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175 #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 176 { \ |
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177 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
| 0 | 178 } |
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179 #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 180 { \ |
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181 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
| 0 | 182 } |
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183 #define RGB888_FROM_RGB(Pixel, r, g, b) \ |
| 0 | 184 { \ |
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185 Pixel = (r<<16)|(g<<8)|b; \ |
| 0 | 186 } |
| 187 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ | |
| 188 { \ | |
| 189 switch (bpp) { \ | |
| 190 case 2: { \ | |
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191 Uint16 Pixel; \ |
| 0 | 192 \ |
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193 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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194 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 195 } \ |
| 196 break; \ | |
| 197 \ | |
| 198 case 3: { \ | |
| 199 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 200 *((buf)+fmt->Rshift/8) = r; \ | |
| 201 *((buf)+fmt->Gshift/8) = g; \ | |
| 202 *((buf)+fmt->Bshift/8) = b; \ | |
| 203 } else { \ | |
| 204 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 205 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 206 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 207 } \ | |
| 208 } \ | |
| 209 break; \ | |
| 210 \ | |
| 211 case 4: { \ | |
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212 Uint32 Pixel; \ |
| 0 | 213 \ |
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214 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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215 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 216 } \ |
| 217 break; \ | |
| 218 } \ | |
| 219 } | |
| 220 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ | |
| 221 { \ | |
| 222 switch (bpp) { \ | |
| 223 case 2: { \ | |
| 224 Uint16 *bufp; \ | |
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225 Uint16 Pixel; \ |
| 0 | 226 \ |
| 227 bufp = (Uint16 *)buf; \ | |
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228 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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229 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 230 } \ |
| 231 break; \ | |
| 232 \ | |
| 233 case 3: { \ | |
| 234 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 235 *((buf)+fmt->Rshift/8) = r; \ | |
| 236 *((buf)+fmt->Gshift/8) = g; \ | |
| 237 *((buf)+fmt->Bshift/8) = b; \ | |
| 238 } else { \ | |
| 239 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 240 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 241 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 242 } \ | |
| 243 } \ | |
| 244 break; \ | |
| 245 \ | |
| 246 case 4: { \ | |
| 247 Uint32 *bufp; \ | |
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248 Uint32 Pixel; \ |
| 0 | 249 \ |
| 250 bufp = (Uint32 *)buf; \ | |
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251 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \ |
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252 *bufp = Pixel | (*bufp & Amask); \ |
| 0 | 253 } \ |
| 254 break; \ | |
| 255 } \ | |
| 256 } | |
| 257 | |
| 258 /* FIXME: Should we rescale alpha into 0..255 here? */ | |
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259 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| 0 | 260 { \ |
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261 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
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262 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
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263 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
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264 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
| 0 | 265 } |
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266 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| 0 | 267 { \ |
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268 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \ |
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269 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \ |
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270 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \ |
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271 a = (Pixel&fmt->Amask)>>fmt->Ashift; \ |
| 0 | 272 } |
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273 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| 0 | 274 { \ |
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275 r = (Pixel>>24); \ |
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276 g = ((Pixel>>16)&0xFF); \ |
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277 b = ((Pixel>>8)&0xFF); \ |
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278 a = (Pixel&0xFF); \ |
| 0 | 279 } |
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280 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| 0 | 281 { \ |
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282 r = ((Pixel>>16)&0xFF); \ |
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283 g = ((Pixel>>8)&0xFF); \ |
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284 b = (Pixel&0xFF); \ |
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285 a = (Pixel>>24); \ |
| 0 | 286 } |
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287 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| 0 | 288 { \ |
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289 r = (Pixel&0xFF); \ |
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290 g = ((Pixel>>8)&0xFF); \ |
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291 b = ((Pixel>>16)&0xFF); \ |
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292 a = (Pixel>>24); \ |
| 0 | 293 } |
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294 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| 0 | 295 do { \ |
| 296 switch (bpp) { \ | |
| 297 case 2: \ | |
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298 Pixel = *((Uint16 *)(buf)); \ |
| 0 | 299 break; \ |
| 300 \ | |
| 301 case 3: {/* FIXME: broken code (no alpha) */ \ | |
| 302 Uint8 *b = (Uint8 *)buf; \ | |
| 303 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
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304 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
| 0 | 305 } else { \ |
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306 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
| 0 | 307 } \ |
| 308 } \ | |
| 309 break; \ | |
| 310 \ | |
| 311 case 4: \ | |
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312 Pixel = *((Uint32 *)(buf)); \ |
| 0 | 313 break; \ |
| 314 \ | |
| 315 default: \ | |
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316 Pixel = 0; /* stop gcc complaints */ \ |
| 0 | 317 break; \ |
| 318 } \ | |
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319 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
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320 Pixel &= ~fmt->Amask; \ |
| 0 | 321 } while(0) |
| 322 | |
| 323 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ | |
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324 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| 0 | 325 { \ |
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326 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
| 0 | 327 ((g>>fmt->Gloss)<<fmt->Gshift)| \ |
| 328 ((b>>fmt->Bloss)<<fmt->Bshift)| \ | |
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329 ((a>>fmt->Aloss)<<fmt->Ashift); \ |
| 0 | 330 } |
| 331 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ | |
| 332 { \ | |
| 333 switch (bpp) { \ | |
| 334 case 2: { \ | |
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335 Uint16 Pixel; \ |
| 0 | 336 \ |
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337 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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338 *((Uint16 *)(buf)) = Pixel; \ |
| 0 | 339 } \ |
| 340 break; \ | |
| 341 \ | |
| 342 case 3: { /* FIXME: broken code (no alpha) */ \ | |
| 343 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ | |
| 344 *((buf)+fmt->Rshift/8) = r; \ | |
| 345 *((buf)+fmt->Gshift/8) = g; \ | |
| 346 *((buf)+fmt->Bshift/8) = b; \ | |
| 347 } else { \ | |
| 348 *((buf)+2-fmt->Rshift/8) = r; \ | |
| 349 *((buf)+2-fmt->Gshift/8) = g; \ | |
| 350 *((buf)+2-fmt->Bshift/8) = b; \ | |
| 351 } \ | |
| 352 } \ | |
| 353 break; \ | |
| 354 \ | |
| 355 case 4: { \ | |
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356 Uint32 Pixel; \ |
| 0 | 357 \ |
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358 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \ |
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359 *((Uint32 *)(buf)) = Pixel; \ |
| 0 | 360 } \ |
| 361 break; \ | |
| 362 } \ | |
| 363 } | |
| 364 | |
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365 /* Blend the RGB values of two Pixels based on a source alpha value */ |
| 0 | 366 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
| 367 do { \ | |
| 368 dR = (((sR-dR)*(A))>>8)+dR; \ | |
| 369 dG = (((sG-dG)*(A))>>8)+dG; \ | |
| 370 dB = (((sB-dB)*(A))>>8)+dB; \ | |
| 371 } while(0) | |
| 372 | |
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373 /* Blend the RGB values of two Pixels based on a source alpha value */ |
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374 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ |
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375 do { \ |
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376 unsigned tR, tG, tB, tA; \ |
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377 tA = 255 - sA; \ |
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378 tR = 1 + (sR * sA) + (dR * tA); \ |
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379 dR = (tR + (tR >> 8)) >> 8; \ |
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380 tG = 1 + (sG * sA) + (dG * tA); \ |
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381 dG = (tG + (tG >> 8)) >> 8; \ |
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382 tB = 1 + (sB * sA) + (dB * tA); \ |
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383 dB = (tB + (tB >> 8)) >> 8; \ |
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384 } while(0) |
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385 |
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386 |
| 0 | 387 /* This is a very useful loop for optimizing blitters */ |
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388 #if defined(_MSC_VER) && (_MSC_VER == 1300) |
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389 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ |
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390 #else |
| 0 | 391 #define USE_DUFFS_LOOP |
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392 #endif |
| 0 | 393 #ifdef USE_DUFFS_LOOP |
| 394 | |
| 395 /* 8-times unrolled loop */ | |
| 396 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 397 { int n = (width+7)/8; \ | |
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398 switch (width & 7) { \ |
| 0 | 399 case 0: do { pixel_copy_increment; \ |
| 400 case 7: pixel_copy_increment; \ | |
| 401 case 6: pixel_copy_increment; \ | |
| 402 case 5: pixel_copy_increment; \ | |
| 403 case 4: pixel_copy_increment; \ | |
| 404 case 3: pixel_copy_increment; \ | |
| 405 case 2: pixel_copy_increment; \ | |
| 406 case 1: pixel_copy_increment; \ | |
| 407 } while ( --n > 0 ); \ | |
| 408 } \ | |
| 409 } | |
| 410 | |
| 411 /* 4-times unrolled loop */ | |
| 412 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 413 { int n = (width+3)/4; \ | |
|
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414 switch (width & 3) { \ |
| 0 | 415 case 0: do { pixel_copy_increment; \ |
| 416 case 3: pixel_copy_increment; \ | |
| 417 case 2: pixel_copy_increment; \ | |
| 418 case 1: pixel_copy_increment; \ | |
| 419 } while ( --n > 0 ); \ | |
| 420 } \ | |
| 421 } | |
| 422 | |
|
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423 /* 2 - times unrolled loop */ |
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424 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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425 double_pixel_copy_increment, width) \ |
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426 { int n, w = width; \ |
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427 if( w & 1 ) { \ |
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428 pixel_copy_increment; \ |
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429 w--; \ |
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430 } \ |
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431 if ( w > 0 ) { \ |
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432 n = ( w + 2) / 4; \ |
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433 switch( w & 2 ) { \ |
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434 case 0: do { double_pixel_copy_increment; \ |
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435 case 2: double_pixel_copy_increment; \ |
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436 } while ( --n > 0 ); \ |
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437 } \ |
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438 } \ |
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439 } |
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440 |
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441 /* 2 - times unrolled loop 4 pixels */ |
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442 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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443 double_pixel_copy_increment, \ |
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444 quatro_pixel_copy_increment, width) \ |
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445 { int n, w = width; \ |
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446 if(w & 1) { \ |
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447 pixel_copy_increment; \ |
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448 w--; \ |
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449 } \ |
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450 if(w & 2) { \ |
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451 double_pixel_copy_increment; \ |
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452 w -= 2; \ |
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453 } \ |
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454 if ( w > 0 ) { \ |
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455 n = ( w + 7 ) / 8; \ |
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456 switch( w & 4 ) { \ |
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457 case 0: do { quatro_pixel_copy_increment; \ |
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458 case 4: quatro_pixel_copy_increment; \ |
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459 } while ( --n > 0 ); \ |
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460 } \ |
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461 } \ |
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462 } |
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463 |
| 0 | 464 /* Use the 8-times version of the loop by default */ |
| 465 #define DUFFS_LOOP(pixel_copy_increment, width) \ | |
| 466 DUFFS_LOOP8(pixel_copy_increment, width) | |
| 467 | |
| 468 #else | |
| 469 | |
| 470 /* Don't use Duff's device to unroll loops */ | |
|
689
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471 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ |
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472 double_pixel_copy_increment, width) \ |
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473 { int n = width; \ |
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474 if( n & 1 ) { \ |
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475 pixel_copy_increment; \ |
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476 n--; \ |
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477 } \ |
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478 n=n>>1; \ |
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479 for(; n > 0; --n) { \ |
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480 double_pixel_copy_increment; \ |
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481 } \ |
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482 } |
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483 |
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484 /* Don't use Duff's device to unroll loops */ |
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485 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ |
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486 double_pixel_copy_increment, \ |
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487 quatro_pixel_copy_increment, width) \ |
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488 { int n = width; \ |
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489 if(n & 1) { \ |
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490 pixel_copy_increment; \ |
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491 n--; \ |
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492 } \ |
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493 if(n & 2) { \ |
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494 double_pixel_copy_increment; \ |
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495 n -= 2; \ |
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496 } \ |
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497 n=n>>2; \ |
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498 for(; n > 0; --n) { \ |
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499 quatro_pixel_copy_increment; \ |
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500 } \ |
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501 } |
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502 |
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503 /* Don't use Duff's device to unroll loops */ |
| 0 | 504 #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| 505 { int n; \ | |
| 506 for ( n=width; n > 0; --n ) { \ | |
| 507 pixel_copy_increment; \ | |
| 508 } \ | |
| 509 } | |
| 510 #define DUFFS_LOOP8(pixel_copy_increment, width) \ | |
| 511 DUFFS_LOOP(pixel_copy_increment, width) | |
| 512 #define DUFFS_LOOP4(pixel_copy_increment, width) \ | |
| 513 DUFFS_LOOP(pixel_copy_increment, width) | |
| 514 | |
| 515 #endif /* USE_DUFFS_LOOP */ | |
| 516 | |
| 517 /* Prevent Visual C++ 6.0 from printing out stupid warnings */ | |
| 518 #if defined(_MSC_VER) && (_MSC_VER >= 600) | |
| 519 #pragma warning(disable: 4550) | |
| 520 #endif | |
| 521 | |
| 522 #endif /* _SDL_blit_h */ |