Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_A.c @ 337:9154ec9ca3d2
Explicitly specify the SDL API calling convention (C by default)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 11 Apr 2002 14:35:16 +0000 |
| parents | f6ffac90895c |
| children | 5bb080d35049 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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 | |
|
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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 | |
| 30 #include "SDL_types.h" | |
| 31 #include "SDL_video.h" | |
| 32 #include "SDL_blit.h" | |
| 33 | |
| 34 /* Functions to perform alpha blended blitting */ | |
| 35 | |
| 36 /* N->1 blending with per-surface alpha */ | |
| 37 static void BlitNto1SurfaceAlpha(SDL_BlitInfo *info) | |
| 38 { | |
| 39 int width = info->d_width; | |
| 40 int height = info->d_height; | |
| 41 Uint8 *src = info->s_pixels; | |
| 42 int srcskip = info->s_skip; | |
| 43 Uint8 *dst = info->d_pixels; | |
| 44 int dstskip = info->d_skip; | |
| 45 Uint8 *palmap = info->table; | |
| 46 SDL_PixelFormat *srcfmt = info->src; | |
| 47 SDL_PixelFormat *dstfmt = info->dst; | |
| 48 int srcbpp = srcfmt->BytesPerPixel; | |
| 49 | |
| 50 const unsigned A = srcfmt->alpha; | |
| 51 | |
| 52 while ( height-- ) { | |
| 53 DUFFS_LOOP4( | |
| 54 { | |
| 55 Uint32 pixel; | |
| 56 unsigned sR; | |
| 57 unsigned sG; | |
| 58 unsigned sB; | |
| 59 unsigned dR; | |
| 60 unsigned dG; | |
| 61 unsigned dB; | |
| 62 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB); | |
| 63 dR = dstfmt->palette->colors[*dst].r; | |
| 64 dG = dstfmt->palette->colors[*dst].g; | |
| 65 dB = dstfmt->palette->colors[*dst].b; | |
| 66 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 67 dR &= 0xff; | |
| 68 dG &= 0xff; | |
| 69 dB &= 0xff; | |
| 70 /* Pack RGB into 8bit pixel */ | |
| 71 if ( palmap == NULL ) { | |
| 72 *dst =((dR>>5)<<(3+2))| | |
| 73 ((dG>>5)<<(2))| | |
| 74 ((dB>>6)<<(0)); | |
| 75 } else { | |
| 76 *dst = palmap[((dR>>5)<<(3+2))| | |
| 77 ((dG>>5)<<(2)) | | |
| 78 ((dB>>6)<<(0))]; | |
| 79 } | |
| 80 dst++; | |
| 81 src += srcbpp; | |
| 82 }, | |
| 83 width); | |
| 84 src += srcskip; | |
| 85 dst += dstskip; | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 /* N->1 blending with pixel alpha */ | |
| 90 static void BlitNto1PixelAlpha(SDL_BlitInfo *info) | |
| 91 { | |
| 92 int width = info->d_width; | |
| 93 int height = info->d_height; | |
| 94 Uint8 *src = info->s_pixels; | |
| 95 int srcskip = info->s_skip; | |
| 96 Uint8 *dst = info->d_pixels; | |
| 97 int dstskip = info->d_skip; | |
| 98 Uint8 *palmap = info->table; | |
| 99 SDL_PixelFormat *srcfmt = info->src; | |
| 100 SDL_PixelFormat *dstfmt = info->dst; | |
| 101 int srcbpp = srcfmt->BytesPerPixel; | |
| 102 | |
| 103 /* FIXME: fix alpha bit field expansion here too? */ | |
| 104 while ( height-- ) { | |
| 105 DUFFS_LOOP4( | |
| 106 { | |
| 107 Uint32 pixel; | |
| 108 unsigned sR; | |
| 109 unsigned sG; | |
| 110 unsigned sB; | |
| 111 unsigned sA; | |
| 112 unsigned dR; | |
| 113 unsigned dG; | |
| 114 unsigned dB; | |
| 115 DISEMBLE_RGBA(src,srcbpp,srcfmt,pixel,sR,sG,sB,sA); | |
| 116 dR = dstfmt->palette->colors[*dst].r; | |
| 117 dG = dstfmt->palette->colors[*dst].g; | |
| 118 dB = dstfmt->palette->colors[*dst].b; | |
| 119 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); | |
| 120 dR &= 0xff; | |
| 121 dG &= 0xff; | |
| 122 dB &= 0xff; | |
| 123 /* Pack RGB into 8bit pixel */ | |
| 124 if ( palmap == NULL ) { | |
| 125 *dst =((dR>>5)<<(3+2))| | |
| 126 ((dG>>5)<<(2))| | |
| 127 ((dB>>6)<<(0)); | |
| 128 } else { | |
| 129 *dst = palmap[((dR>>5)<<(3+2))| | |
| 130 ((dG>>5)<<(2)) | | |
| 131 ((dB>>6)<<(0)) ]; | |
| 132 } | |
| 133 dst++; | |
| 134 src += srcbpp; | |
| 135 }, | |
| 136 width); | |
| 137 src += srcskip; | |
| 138 dst += dstskip; | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 /* colorkeyed N->1 blending with per-surface alpha */ | |
| 143 static void BlitNto1SurfaceAlphaKey(SDL_BlitInfo *info) | |
| 144 { | |
| 145 int width = info->d_width; | |
| 146 int height = info->d_height; | |
| 147 Uint8 *src = info->s_pixels; | |
| 148 int srcskip = info->s_skip; | |
| 149 Uint8 *dst = info->d_pixels; | |
| 150 int dstskip = info->d_skip; | |
| 151 Uint8 *palmap = info->table; | |
| 152 SDL_PixelFormat *srcfmt = info->src; | |
| 153 SDL_PixelFormat *dstfmt = info->dst; | |
| 154 int srcbpp = srcfmt->BytesPerPixel; | |
| 155 Uint32 ckey = srcfmt->colorkey; | |
| 156 | |
| 157 const int A = srcfmt->alpha; | |
| 158 | |
| 159 while ( height-- ) { | |
| 160 DUFFS_LOOP( | |
| 161 { | |
| 162 Uint32 pixel; | |
| 163 unsigned sR; | |
| 164 unsigned sG; | |
| 165 unsigned sB; | |
| 166 unsigned dR; | |
| 167 unsigned dG; | |
| 168 unsigned dB; | |
| 169 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB); | |
| 170 if ( pixel != ckey ) { | |
| 171 dR = dstfmt->palette->colors[*dst].r; | |
| 172 dG = dstfmt->palette->colors[*dst].g; | |
| 173 dB = dstfmt->palette->colors[*dst].b; | |
| 174 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 175 dR &= 0xff; | |
| 176 dG &= 0xff; | |
| 177 dB &= 0xff; | |
| 178 /* Pack RGB into 8bit pixel */ | |
| 179 if ( palmap == NULL ) { | |
| 180 *dst =((dR>>5)<<(3+2))| | |
| 181 ((dG>>5)<<(2)) | | |
| 182 ((dB>>6)<<(0)); | |
| 183 } else { | |
| 184 *dst = palmap[((dR>>5)<<(3+2))| | |
| 185 ((dG>>5)<<(2)) | | |
| 186 ((dB>>6)<<(0)) ]; | |
| 187 } | |
| 188 } | |
| 189 dst++; | |
| 190 src += srcbpp; | |
| 191 }, | |
| 192 width); | |
| 193 src += srcskip; | |
| 194 dst += dstskip; | |
| 195 } | |
| 196 } | |
| 197 | |
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198 /* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */ |
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199 static void BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo *info) |
| 0 | 200 { |
| 201 int width = info->d_width; | |
| 202 int height = info->d_height; | |
| 203 Uint32 *srcp = (Uint32 *)info->s_pixels; | |
| 204 int srcskip = info->s_skip >> 2; | |
| 205 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 206 int dstskip = info->d_skip >> 2; | |
| 207 | |
| 208 while(height--) { | |
| 209 DUFFS_LOOP4({ | |
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210 Uint32 s = *srcp++; |
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211 Uint32 d = *dstp; |
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212 *dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) |
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213 + (s & d & 0x00010101)) | 0xff000000; |
| 0 | 214 }, width); |
| 215 srcp += srcskip; | |
| 216 dstp += dstskip; | |
| 217 } | |
| 218 } | |
| 219 | |
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220 /* fast RGB888->(A)RGB888 blending with surface alpha */ |
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221 static void BlitRGBtoRGBSurfaceAlpha(SDL_BlitInfo *info) |
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222 { |
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223 unsigned alpha = info->src->alpha; |
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224 if(alpha == 128) { |
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225 BlitRGBtoRGBSurfaceAlpha128(info); |
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226 } else { |
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227 int width = info->d_width; |
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228 int height = info->d_height; |
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229 Uint32 *srcp = (Uint32 *)info->s_pixels; |
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230 int srcskip = info->s_skip >> 2; |
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231 Uint32 *dstp = (Uint32 *)info->d_pixels; |
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232 int dstskip = info->d_skip >> 2; |
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233 |
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234 while(height--) { |
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235 DUFFS_LOOP4({ |
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236 Uint32 s; |
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237 Uint32 d; |
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238 Uint32 s1; |
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239 Uint32 d1; |
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240 s = *srcp; |
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241 d = *dstp; |
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242 s1 = s & 0xff00ff; |
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243 d1 = d & 0xff00ff; |
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244 d1 = (d1 + ((s1 - d1) * alpha >> 8)) |
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245 & 0xff00ff; |
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246 s &= 0xff00; |
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247 d &= 0xff00; |
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248 d = (d + ((s - d) * alpha >> 8)) & 0xff00; |
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249 *dstp = d1 | d | 0xff000000; |
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250 ++srcp; |
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251 ++dstp; |
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252 }, width); |
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253 srcp += srcskip; |
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254 dstp += dstskip; |
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255 } |
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256 } |
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257 } |
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258 |
| 0 | 259 /* fast ARGB888->(A)RGB888 blending with pixel alpha */ |
| 260 static void BlitRGBtoRGBPixelAlpha(SDL_BlitInfo *info) | |
| 261 { | |
| 262 int width = info->d_width; | |
| 263 int height = info->d_height; | |
| 264 Uint32 *srcp = (Uint32 *)info->s_pixels; | |
| 265 int srcskip = info->s_skip >> 2; | |
| 266 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 267 int dstskip = info->d_skip >> 2; | |
| 268 | |
| 269 while(height--) { | |
| 270 DUFFS_LOOP4({ | |
| 271 Uint32 dalpha; | |
| 272 Uint32 d; | |
| 273 Uint32 s1; | |
| 274 Uint32 d1; | |
| 275 Uint32 s = *srcp; | |
| 276 Uint32 alpha = s >> 24; | |
| 277 /* FIXME: Here we special-case opaque alpha since the | |
| 278 compositioning used (>>8 instead of /255) doesn't handle | |
| 279 it correctly. Also special-case alpha=0 for speed? | |
| 280 Benchmark this! */ | |
| 281 if(alpha == SDL_ALPHA_OPAQUE) { | |
| 282 *dstp = (s & 0x00ffffff) | (*dstp & 0xff000000); | |
| 283 } else { | |
| 284 /* | |
| 285 * take out the middle component (green), and process | |
| 286 * the other two in parallel. One multiply less. | |
| 287 */ | |
| 288 d = *dstp; | |
| 289 dalpha = d & 0xff000000; | |
| 290 s1 = s & 0xff00ff; | |
| 291 d1 = d & 0xff00ff; | |
| 292 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; | |
| 293 s &= 0xff00; | |
| 294 d &= 0xff00; | |
| 295 d = (d + ((s - d) * alpha >> 8)) & 0xff00; | |
| 296 *dstp = d1 | d | dalpha; | |
| 297 } | |
| 298 ++srcp; | |
| 299 ++dstp; | |
| 300 }, width); | |
| 301 srcp += srcskip; | |
| 302 dstp += dstskip; | |
| 303 } | |
| 304 } | |
| 305 | |
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306 /* 16bpp special case for per-surface alpha=50%: blend 2 pixels in parallel */ |
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307 |
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308 /* blend a single 16 bit pixel at 50% */ |
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309 #define BLEND16_50(d, s, mask) \ |
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310 ((((s & mask) + (d & mask)) >> 1) + (s & d & (~mask & 0xffff))) |
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311 |
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312 /* blend two 16 bit pixels at 50% */ |
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313 #define BLEND2x16_50(d, s, mask) \ |
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314 (((s & (mask | mask << 16)) >> 1) + ((d & (mask | mask << 16)) >> 1) \ |
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315 + (s & d & (~(mask | mask << 16)))) |
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316 |
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317 static void Blit16to16SurfaceAlpha128(SDL_BlitInfo *info, Uint16 mask) |
| 0 | 318 { |
| 319 int width = info->d_width; | |
| 320 int height = info->d_height; | |
| 321 Uint16 *srcp = (Uint16 *)info->s_pixels; | |
| 322 int srcskip = info->s_skip >> 1; | |
| 323 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 324 int dstskip = info->d_skip >> 1; | |
| 325 | |
| 326 while(height--) { | |
|
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327 if(((unsigned long)srcp ^ (unsigned long)dstp) & 2) { |
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328 /* |
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329 * Source and destination not aligned, pipeline it. |
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330 * This is mostly a win for big blits but no loss for |
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331 * small ones |
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332 */ |
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333 Uint32 prev_sw; |
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334 int w = width; |
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335 |
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336 /* handle odd destination */ |
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337 if((unsigned long)dstp & 2) { |
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338 Uint16 d = *dstp, s = *srcp; |
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339 *dstp = BLEND16_50(d, s, mask); |
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340 dstp++; |
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341 srcp++; |
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342 w--; |
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343 } |
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344 srcp++; /* srcp is now 32-bit aligned */ |
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345 |
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346 /* bootstrap pipeline with first halfword */ |
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347 prev_sw = ((Uint32 *)srcp)[-1]; |
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348 |
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349 while(w > 1) { |
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350 Uint32 sw, dw, s; |
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351 sw = *(Uint32 *)srcp; |
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352 dw = *(Uint32 *)dstp; |
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353 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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354 s = (prev_sw << 16) + (sw >> 16); |
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355 else |
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356 s = (prev_sw >> 16) + (sw << 16); |
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357 prev_sw = sw; |
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358 *(Uint32 *)dstp = BLEND2x16_50(dw, s, mask); |
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359 dstp += 2; |
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360 srcp += 2; |
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361 w -= 2; |
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362 } |
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363 |
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364 /* final pixel if any */ |
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365 if(w) { |
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366 Uint16 d = *dstp, s; |
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367 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) |
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368 s = prev_sw; |
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369 else |
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370 s = prev_sw >> 16; |
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371 *dstp = BLEND16_50(d, s, mask); |
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372 srcp++; |
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373 dstp++; |
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374 } |
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375 srcp += srcskip - 1; |
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376 dstp += dstskip; |
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377 } else { |
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378 /* source and destination are aligned */ |
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379 int w = width; |
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380 |
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381 /* first odd pixel? */ |
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382 if((unsigned long)srcp & 2) { |
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383 Uint16 d = *dstp, s = *srcp; |
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384 *dstp = BLEND16_50(d, s, mask); |
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385 srcp++; |
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386 dstp++; |
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387 w--; |
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388 } |
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389 /* srcp and dstp are now 32-bit aligned */ |
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390 |
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391 while(w > 1) { |
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392 Uint32 sw = *(Uint32 *)srcp; |
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393 Uint32 dw = *(Uint32 *)dstp; |
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394 *(Uint32 *)dstp = BLEND2x16_50(dw, sw, mask); |
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395 srcp += 2; |
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396 dstp += 2; |
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397 w -= 2; |
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398 } |
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399 |
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400 /* last odd pixel? */ |
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401 if(w) { |
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402 Uint16 d = *dstp, s = *srcp; |
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403 *dstp = BLEND16_50(d, s, mask); |
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404 srcp++; |
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405 dstp++; |
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406 } |
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407 srcp += srcskip; |
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408 dstp += dstskip; |
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409 } |
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410 } |
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411 } |
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412 |
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413 /* fast RGB565->RGB565 blending with surface alpha */ |
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414 static void Blit565to565SurfaceAlpha(SDL_BlitInfo *info) |
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415 { |
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416 unsigned alpha = info->src->alpha; |
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417 if(alpha == 128) { |
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418 Blit16to16SurfaceAlpha128(info, 0xf7de); |
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419 } else { |
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420 int width = info->d_width; |
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421 int height = info->d_height; |
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422 Uint16 *srcp = (Uint16 *)info->s_pixels; |
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423 int srcskip = info->s_skip >> 1; |
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424 Uint16 *dstp = (Uint16 *)info->d_pixels; |
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425 int dstskip = info->d_skip >> 1; |
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426 alpha >>= 3; /* downscale alpha to 5 bits */ |
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427 |
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428 while(height--) { |
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429 DUFFS_LOOP4({ |
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430 Uint32 s = *srcp++; |
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431 Uint32 d = *dstp; |
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432 /* |
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433 * shift out the middle component (green) to |
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|
434 * the high 16 bits, and process all three RGB |
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435 * components at the same time. |
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436 */ |
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437 s = (s | s << 16) & 0x07e0f81f; |
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438 d = (d | d << 16) & 0x07e0f81f; |
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439 d += (s - d) * alpha >> 5; |
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440 d &= 0x07e0f81f; |
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441 *dstp++ = d | d >> 16; |
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442 }, width); |
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443 srcp += srcskip; |
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444 dstp += dstskip; |
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445 } |
| 0 | 446 } |
| 447 } | |
| 448 | |
| 449 /* fast RGB555->RGB555 blending with surface alpha */ | |
| 450 static void Blit555to555SurfaceAlpha(SDL_BlitInfo *info) | |
| 451 { | |
|
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452 unsigned alpha = info->src->alpha; /* downscale alpha to 5 bits */ |
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453 if(alpha == 128) { |
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454 Blit16to16SurfaceAlpha128(info, 0xfbde); |
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455 } else { |
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456 int width = info->d_width; |
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457 int height = info->d_height; |
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458 Uint16 *srcp = (Uint16 *)info->s_pixels; |
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459 int srcskip = info->s_skip >> 1; |
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460 Uint16 *dstp = (Uint16 *)info->d_pixels; |
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461 int dstskip = info->d_skip >> 1; |
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462 alpha >>= 3; /* downscale alpha to 5 bits */ |
| 0 | 463 |
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464 while(height--) { |
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465 DUFFS_LOOP4({ |
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466 Uint32 s = *srcp++; |
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467 Uint32 d = *dstp; |
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468 /* |
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469 * shift out the middle component (green) to |
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470 * the high 16 bits, and process all three RGB |
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471 * components at the same time. |
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472 */ |
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473 s = (s | s << 16) & 0x03e07c1f; |
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474 d = (d | d << 16) & 0x03e07c1f; |
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475 d += (s - d) * alpha >> 5; |
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476 d &= 0x03e07c1f; |
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477 *dstp++ = d | d >> 16; |
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478 }, width); |
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479 srcp += srcskip; |
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480 dstp += dstskip; |
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481 } |
| 0 | 482 } |
| 483 } | |
| 484 | |
| 485 /* fast ARGB8888->RGB565 blending with pixel alpha */ | |
| 486 static void BlitARGBto565PixelAlpha(SDL_BlitInfo *info) | |
| 487 { | |
| 488 int width = info->d_width; | |
| 489 int height = info->d_height; | |
| 490 Uint32 *srcp = (Uint32 *)info->s_pixels; | |
| 491 int srcskip = info->s_skip >> 2; | |
| 492 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 493 int dstskip = info->d_skip >> 1; | |
| 494 | |
| 495 while(height--) { | |
| 496 DUFFS_LOOP4({ | |
| 497 Uint32 s = *srcp; | |
| 498 unsigned alpha = s >> 27; /* downscale alpha to 5 bits */ | |
| 499 /* FIXME: Here we special-case opaque alpha since the | |
| 500 compositioning used (>>8 instead of /255) doesn't handle | |
| 501 it correctly. Also special-case alpha=0 for speed? | |
| 502 Benchmark this! */ | |
| 503 if(alpha == (SDL_ALPHA_OPAQUE >> 3)) { | |
| 504 *dstp = (s >> 8 & 0xf800) + (s >> 5 & 0x7e0) | |
| 505 + (s >> 3 & 0x1f); | |
| 506 } else { | |
| 507 Uint32 d = *dstp; | |
| 508 /* | |
| 509 * convert source and destination to G0RAB65565 | |
| 510 * and blend all components at the same time | |
| 511 */ | |
| 512 s = ((s & 0xfc00) << 11) + (s >> 8 & 0xf800) | |
| 513 + (s >> 3 & 0x1f); | |
| 514 d = (d | d << 16) & 0x07e0f81f; | |
| 515 d += (s - d) * alpha >> 5; | |
| 516 d &= 0x07e0f81f; | |
| 517 *dstp = d | d >> 16; | |
| 518 } | |
| 519 srcp++; | |
| 520 dstp++; | |
| 521 }, width); | |
| 522 srcp += srcskip; | |
| 523 dstp += dstskip; | |
| 524 } | |
| 525 } | |
| 526 | |
| 527 /* fast ARGB8888->RGB555 blending with pixel alpha */ | |
| 528 static void BlitARGBto555PixelAlpha(SDL_BlitInfo *info) | |
| 529 { | |
| 530 int width = info->d_width; | |
| 531 int height = info->d_height; | |
| 532 Uint32 *srcp = (Uint32 *)info->s_pixels; | |
| 533 int srcskip = info->s_skip >> 2; | |
| 534 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 535 int dstskip = info->d_skip >> 1; | |
| 536 | |
| 537 while(height--) { | |
| 538 DUFFS_LOOP4({ | |
| 539 unsigned alpha; | |
| 540 Uint32 s = *srcp; | |
| 541 alpha = s >> 27; /* downscale alpha to 5 bits */ | |
| 542 /* FIXME: Here we special-case opaque alpha since the | |
| 543 compositioning used (>>8 instead of /255) doesn't handle | |
| 544 it correctly. Also special-case alpha=0 for speed? | |
| 545 Benchmark this! */ | |
| 546 if(alpha == (SDL_ALPHA_OPAQUE >> 3)) { | |
| 547 *dstp = (s >> 9 & 0x7c00) + (s >> 6 & 0x3e0) | |
| 548 + (s >> 3 & 0x1f); | |
| 549 } else { | |
| 550 Uint32 d = *dstp; | |
| 551 /* | |
| 552 * convert source and destination to G0RAB65565 | |
| 553 * and blend all components at the same time | |
| 554 */ | |
| 555 s = ((s & 0xf800) << 10) + (s >> 9 & 0x7c00) | |
| 556 + (s >> 3 & 0x1f); | |
| 557 d = (d | d << 16) & 0x03e07c1f; | |
| 558 d += (s - d) * alpha >> 5; | |
| 559 d &= 0x03e07c1f; | |
| 560 *dstp = d | d >> 16; | |
| 561 } | |
| 562 srcp++; | |
| 563 dstp++; | |
| 564 }, width); | |
| 565 srcp += srcskip; | |
| 566 dstp += dstskip; | |
| 567 } | |
| 568 } | |
| 569 | |
| 570 /* General (slow) N->N blending with per-surface alpha */ | |
| 571 static void BlitNtoNSurfaceAlpha(SDL_BlitInfo *info) | |
| 572 { | |
| 573 int width = info->d_width; | |
| 574 int height = info->d_height; | |
| 575 Uint8 *src = info->s_pixels; | |
| 576 int srcskip = info->s_skip; | |
| 577 Uint8 *dst = info->d_pixels; | |
| 578 int dstskip = info->d_skip; | |
| 579 SDL_PixelFormat *srcfmt = info->src; | |
| 580 SDL_PixelFormat *dstfmt = info->dst; | |
| 581 int srcbpp = srcfmt->BytesPerPixel; | |
| 582 int dstbpp = dstfmt->BytesPerPixel; | |
| 583 unsigned sA = srcfmt->alpha; | |
| 584 unsigned dA = dstfmt->Amask ? SDL_ALPHA_OPAQUE : 0; | |
| 585 | |
| 586 while ( height-- ) { | |
| 587 DUFFS_LOOP4( | |
| 588 { | |
| 589 Uint32 pixel; | |
| 590 unsigned sR; | |
| 591 unsigned sG; | |
| 592 unsigned sB; | |
| 593 unsigned dR; | |
| 594 unsigned dG; | |
| 595 unsigned dB; | |
| 596 DISEMBLE_RGB(src, srcbpp, srcfmt, pixel, sR, sG, sB); | |
| 597 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB); | |
| 598 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); | |
| 599 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA); | |
| 600 src += srcbpp; | |
| 601 dst += dstbpp; | |
| 602 }, | |
| 603 width); | |
| 604 src += srcskip; | |
| 605 dst += dstskip; | |
| 606 } | |
| 607 } | |
| 608 | |
| 609 /* General (slow) colorkeyed N->N blending with per-surface alpha */ | |
| 610 static void BlitNtoNSurfaceAlphaKey(SDL_BlitInfo *info) | |
| 611 { | |
| 612 int width = info->d_width; | |
| 613 int height = info->d_height; | |
| 614 Uint8 *src = info->s_pixels; | |
| 615 int srcskip = info->s_skip; | |
| 616 Uint8 *dst = info->d_pixels; | |
| 617 int dstskip = info->d_skip; | |
| 618 SDL_PixelFormat *srcfmt = info->src; | |
| 619 SDL_PixelFormat *dstfmt = info->dst; | |
| 620 Uint32 ckey = srcfmt->colorkey; | |
| 621 int srcbpp = srcfmt->BytesPerPixel; | |
| 622 int dstbpp = dstfmt->BytesPerPixel; | |
| 623 unsigned sA = srcfmt->alpha; | |
| 624 unsigned dA = dstfmt->Amask ? SDL_ALPHA_OPAQUE : 0; | |
| 625 | |
| 626 while ( height-- ) { | |
| 627 DUFFS_LOOP4( | |
| 628 { | |
| 629 Uint32 pixel; | |
| 630 unsigned sR; | |
| 631 unsigned sG; | |
| 632 unsigned sB; | |
| 633 unsigned dR; | |
| 634 unsigned dG; | |
| 635 unsigned dB; | |
| 636 RETRIEVE_RGB_PIXEL(src, srcbpp, pixel); | |
| 637 if(pixel != ckey) { | |
| 638 RGB_FROM_PIXEL(pixel, srcfmt, sR, sG, sB); | |
| 639 DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB); | |
| 640 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); | |
| 641 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA); | |
| 642 } | |
| 643 src += srcbpp; | |
| 644 dst += dstbpp; | |
| 645 }, | |
| 646 width); | |
| 647 src += srcskip; | |
| 648 dst += dstskip; | |
| 649 } | |
| 650 } | |
| 651 | |
| 652 /* General (slow) N->N blending with pixel alpha */ | |
| 653 static void BlitNtoNPixelAlpha(SDL_BlitInfo *info) | |
| 654 { | |
| 655 int width = info->d_width; | |
| 656 int height = info->d_height; | |
| 657 Uint8 *src = info->s_pixels; | |
| 658 int srcskip = info->s_skip; | |
| 659 Uint8 *dst = info->d_pixels; | |
| 660 int dstskip = info->d_skip; | |
| 661 SDL_PixelFormat *srcfmt = info->src; | |
| 662 SDL_PixelFormat *dstfmt = info->dst; | |
| 663 | |
| 664 int srcbpp; | |
| 665 int dstbpp; | |
| 666 | |
| 667 /* Set up some basic variables */ | |
| 668 srcbpp = srcfmt->BytesPerPixel; | |
| 669 dstbpp = dstfmt->BytesPerPixel; | |
| 670 | |
| 671 /* FIXME: for 8bpp source alpha, this doesn't get opaque values | |
| 672 quite right. for <8bpp source alpha, it gets them very wrong | |
| 673 (check all macros!) | |
| 674 It is unclear whether there is a good general solution that doesn't | |
| 675 need a branch (or a divide). */ | |
| 676 while ( height-- ) { | |
| 677 DUFFS_LOOP4( | |
| 678 { | |
| 679 Uint32 pixel; | |
| 680 unsigned sR; | |
| 681 unsigned sG; | |
| 682 unsigned sB; | |
| 683 unsigned dR; | |
| 684 unsigned dG; | |
| 685 unsigned dB; | |
| 686 unsigned sA; | |
| 687 unsigned dA; | |
| 688 DISEMBLE_RGBA(src, srcbpp, srcfmt, pixel, sR, sG, sB, sA); | |
| 689 DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA); | |
| 690 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); | |
| 691 ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA); | |
| 692 src += srcbpp; | |
| 693 dst += dstbpp; | |
| 694 }, | |
| 695 width); | |
| 696 src += srcskip; | |
| 697 dst += dstskip; | |
| 698 } | |
| 699 } | |
| 700 | |
| 701 | |
| 702 SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int blit_index) | |
| 703 { | |
| 704 SDL_PixelFormat *sf = surface->format; | |
| 705 SDL_PixelFormat *df = surface->map->dst->format; | |
| 706 | |
| 707 if(sf->Amask == 0) { | |
| 708 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 709 if(df->BytesPerPixel == 1) | |
| 710 return BlitNto1SurfaceAlphaKey; | |
| 711 else | |
| 712 return BlitNtoNSurfaceAlphaKey; | |
| 713 } else { | |
| 714 /* Per-surface alpha blits */ | |
| 715 switch(df->BytesPerPixel) { | |
| 716 case 1: | |
| 717 return BlitNto1SurfaceAlpha; | |
| 718 | |
| 719 case 2: | |
| 720 if(surface->map->identity) { | |
| 721 if(df->Gmask == 0x7e0) | |
| 722 return Blit565to565SurfaceAlpha; | |
| 723 else if(df->Gmask == 0x3e0) | |
| 724 return Blit555to555SurfaceAlpha; | |
| 725 } | |
| 726 return BlitNtoNSurfaceAlpha; | |
| 727 | |
| 728 case 4: | |
| 729 if(sf->Rmask == df->Rmask | |
| 730 && sf->Gmask == df->Gmask | |
| 731 && sf->Bmask == df->Bmask | |
| 732 && (sf->Rmask | sf->Gmask | sf->Bmask) == 0xffffff | |
| 733 && sf->BytesPerPixel == 4) | |
| 734 return BlitRGBtoRGBSurfaceAlpha; | |
| 735 else | |
| 736 return BlitNtoNSurfaceAlpha; | |
| 737 | |
| 738 case 3: | |
| 739 default: | |
| 740 return BlitNtoNSurfaceAlpha; | |
| 741 } | |
| 742 } | |
| 743 } else { | |
| 744 /* Per-pixel alpha blits */ | |
| 745 switch(df->BytesPerPixel) { | |
| 746 case 1: | |
| 747 return BlitNto1PixelAlpha; | |
| 748 | |
| 749 case 2: | |
| 750 if(sf->BytesPerPixel == 4 && sf->Amask == 0xff000000 | |
| 751 && sf->Gmask == 0xff00 | |
| 752 && ((sf->Rmask == 0xff && df->Rmask == 0x1f) | |
| 753 || (sf->Bmask == 0xff && df->Bmask == 0x1f))) { | |
| 754 if(df->Gmask == 0x7e0) | |
| 755 return BlitARGBto565PixelAlpha; | |
| 756 else if(df->Gmask == 0x3e0) | |
| 757 return BlitARGBto555PixelAlpha; | |
| 758 } | |
| 759 return BlitNtoNPixelAlpha; | |
| 760 | |
| 761 case 4: | |
| 762 if(sf->Amask == 0xff000000 | |
| 763 && sf->Rmask == df->Rmask | |
| 764 && sf->Gmask == df->Gmask | |
| 765 && sf->Bmask == df->Bmask | |
| 766 && sf->BytesPerPixel == 4) | |
| 767 return BlitRGBtoRGBPixelAlpha; | |
| 768 return BlitNtoNPixelAlpha; | |
| 769 | |
| 770 case 3: | |
| 771 default: | |
| 772 return BlitNtoNPixelAlpha; | |
| 773 } | |
| 774 } | |
| 775 } | |
| 776 |