Mercurial > sdl-ios-xcode
annotate src/video/SDL_blendpoint.c @ 5004:0c72ae7b7cb2
Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Changed the CAS return value to bool, so it's efficient with OSAtomicCompareAndSwap32Barrier()
Added an atomic test adapted from code by Michael Davidsaver
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 16 Jan 2011 15:16:39 -0800 |
| parents | aa8888658021 |
| children | e743b9c3f6d6 |
| rev | line source |
|---|---|
| 2901 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
| 2901 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Lesser General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2.1 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 Lesser General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Lesser General Public | |
| 16 License along with this library; if not, write to the Free Software | |
| 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 #include "SDL_config.h" | |
| 23 | |
| 24 #include "SDL_draw.h" | |
| 25 | |
| 26 static int | |
|
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27 SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 28 Uint8 g, Uint8 b, Uint8 a) |
| 29 { | |
| 30 unsigned inva = 0xff - a; | |
| 31 | |
| 32 switch (blendMode) { | |
| 33 case SDL_BLENDMODE_BLEND: | |
| 34 DRAW_SETPIXELXY_BLEND_RGB555(x, y); | |
| 35 break; | |
| 36 case SDL_BLENDMODE_ADD: | |
| 37 DRAW_SETPIXELXY_ADD_RGB555(x, y); | |
| 38 break; | |
| 39 case SDL_BLENDMODE_MOD: | |
| 40 DRAW_SETPIXELXY_MOD_RGB555(x, y); | |
| 41 break; | |
| 42 default: | |
| 43 DRAW_SETPIXELXY_RGB555(x, y); | |
| 44 break; | |
| 45 } | |
| 46 return 0; | |
| 47 } | |
| 48 | |
| 49 static int | |
|
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50 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 51 Uint8 g, Uint8 b, Uint8 a) |
| 52 { | |
| 53 unsigned inva = 0xff - a; | |
| 54 | |
| 55 switch (blendMode) { | |
| 56 case SDL_BLENDMODE_BLEND: | |
| 57 DRAW_SETPIXELXY_BLEND_RGB565(x, y); | |
| 58 break; | |
| 59 case SDL_BLENDMODE_ADD: | |
| 60 DRAW_SETPIXELXY_ADD_RGB565(x, y); | |
| 61 break; | |
| 62 case SDL_BLENDMODE_MOD: | |
| 63 DRAW_SETPIXELXY_MOD_RGB565(x, y); | |
| 64 break; | |
| 65 default: | |
| 66 DRAW_SETPIXELXY_RGB565(x, y); | |
| 67 break; | |
| 68 } | |
| 69 return 0; | |
| 70 } | |
| 71 | |
| 72 static int | |
|
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73 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 74 Uint8 g, Uint8 b, Uint8 a) |
| 75 { | |
| 76 unsigned inva = 0xff - a; | |
| 77 | |
| 78 switch (blendMode) { | |
| 79 case SDL_BLENDMODE_BLEND: | |
| 80 DRAW_SETPIXELXY_BLEND_RGB888(x, y); | |
| 81 break; | |
| 82 case SDL_BLENDMODE_ADD: | |
| 83 DRAW_SETPIXELXY_ADD_RGB888(x, y); | |
| 84 break; | |
| 85 case SDL_BLENDMODE_MOD: | |
| 86 DRAW_SETPIXELXY_MOD_RGB888(x, y); | |
| 87 break; | |
| 88 default: | |
| 89 DRAW_SETPIXELXY_RGB888(x, y); | |
| 90 break; | |
| 91 } | |
| 92 return 0; | |
| 93 } | |
| 94 | |
| 95 static int | |
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96 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, |
| 2901 | 97 Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| 98 { | |
| 99 unsigned inva = 0xff - a; | |
| 100 | |
| 101 switch (blendMode) { | |
| 102 case SDL_BLENDMODE_BLEND: | |
| 103 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); | |
| 104 break; | |
| 105 case SDL_BLENDMODE_ADD: | |
| 106 DRAW_SETPIXELXY_ADD_ARGB8888(x, y); | |
| 107 break; | |
| 108 case SDL_BLENDMODE_MOD: | |
| 109 DRAW_SETPIXELXY_MOD_ARGB8888(x, y); | |
| 110 break; | |
| 111 default: | |
| 112 DRAW_SETPIXELXY_ARGB8888(x, y); | |
| 113 break; | |
| 114 } | |
| 115 return 0; | |
| 116 } | |
| 117 | |
| 118 static int | |
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119 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 120 Uint8 g, Uint8 b, Uint8 a) |
| 121 { | |
| 122 SDL_PixelFormat *fmt = dst->format; | |
| 123 unsigned inva = 0xff - a; | |
| 124 | |
| 125 switch (fmt->BytesPerPixel) { | |
| 126 case 2: | |
| 127 switch (blendMode) { | |
| 128 case SDL_BLENDMODE_BLEND: | |
| 129 DRAW_SETPIXELXY2_BLEND_RGB(x, y); | |
| 130 break; | |
| 131 case SDL_BLENDMODE_ADD: | |
| 132 DRAW_SETPIXELXY2_ADD_RGB(x, y); | |
| 133 break; | |
| 134 case SDL_BLENDMODE_MOD: | |
| 135 DRAW_SETPIXELXY2_MOD_RGB(x, y); | |
| 136 break; | |
| 137 default: | |
| 138 DRAW_SETPIXELXY2_RGB(x, y); | |
| 139 break; | |
| 140 } | |
| 141 return 0; | |
| 142 case 4: | |
| 143 switch (blendMode) { | |
| 144 case SDL_BLENDMODE_BLEND: | |
| 145 DRAW_SETPIXELXY4_BLEND_RGB(x, y); | |
| 146 break; | |
| 147 case SDL_BLENDMODE_ADD: | |
| 148 DRAW_SETPIXELXY4_ADD_RGB(x, y); | |
| 149 break; | |
| 150 case SDL_BLENDMODE_MOD: | |
| 151 DRAW_SETPIXELXY4_MOD_RGB(x, y); | |
| 152 break; | |
| 153 default: | |
| 154 DRAW_SETPIXELXY4_RGB(x, y); | |
| 155 break; | |
| 156 } | |
| 157 return 0; | |
| 158 default: | |
| 159 SDL_Unsupported(); | |
| 160 return -1; | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 static int | |
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165 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 166 Uint8 g, Uint8 b, Uint8 a) |
| 167 { | |
| 168 SDL_PixelFormat *fmt = dst->format; | |
| 169 unsigned inva = 0xff - a; | |
| 170 | |
| 171 switch (fmt->BytesPerPixel) { | |
| 172 case 4: | |
| 173 switch (blendMode) { | |
| 174 case SDL_BLENDMODE_BLEND: | |
| 175 DRAW_SETPIXELXY4_BLEND_RGBA(x, y); | |
| 176 break; | |
| 177 case SDL_BLENDMODE_ADD: | |
| 178 DRAW_SETPIXELXY4_ADD_RGBA(x, y); | |
| 179 break; | |
| 180 case SDL_BLENDMODE_MOD: | |
| 181 DRAW_SETPIXELXY4_MOD_RGBA(x, y); | |
| 182 break; | |
| 183 default: | |
| 184 DRAW_SETPIXELXY4_RGBA(x, y); | |
| 185 break; | |
| 186 } | |
| 187 return 0; | |
| 188 default: | |
| 189 SDL_Unsupported(); | |
| 190 return -1; | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 int | |
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195 SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 196 Uint8 g, Uint8 b, Uint8 a) |
| 197 { | |
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198 if (!dst) { |
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199 SDL_SetError("Passed NULL destination surface"); |
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200 return -1; |
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201 } |
| 2901 | 202 |
| 203 /* This function doesn't work on surfaces < 8 bpp */ | |
| 204 if (dst->format->BitsPerPixel < 8) { | |
| 205 SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); | |
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206 return -1; |
| 2901 | 207 } |
| 208 | |
| 209 /* Perform clipping */ | |
| 210 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 211 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 212 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 213 return 0; | |
| 214 } | |
| 215 | |
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216 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| 2901 | 217 r = DRAW_MUL(r, a); |
| 218 g = DRAW_MUL(g, a); | |
| 219 b = DRAW_MUL(b, a); | |
| 220 } | |
| 221 | |
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222 switch (dst->format->BitsPerPixel) { |
| 2901 | 223 case 15: |
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224 switch (dst->format->Rmask) { |
| 2901 | 225 case 0x7C00: |
| 226 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); | |
| 227 } | |
| 228 break; | |
| 229 case 16: | |
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230 switch (dst->format->Rmask) { |
| 2901 | 231 case 0xF800: |
| 232 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); | |
| 233 } | |
| 234 break; | |
| 235 case 32: | |
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236 switch (dst->format->Rmask) { |
| 2901 | 237 case 0x00FF0000: |
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238 if (!dst->format->Amask) { |
| 2901 | 239 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, |
| 240 a); | |
| 241 } else { | |
| 242 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, | |
| 243 a); | |
| 244 } | |
| 245 break; | |
| 246 } | |
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247 break; |
| 2901 | 248 default: |
| 249 break; | |
| 250 } | |
| 251 | |
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252 if (!dst->format->Amask) { |
| 2901 | 253 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); |
| 254 } else { | |
| 255 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); | |
| 256 } | |
| 257 } | |
| 258 | |
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259 int |
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260 SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, |
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261 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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262 { |
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263 int minx, miny; |
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264 int maxx, maxy; |
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265 int i; |
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266 int x, y; |
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267 int (*func)(SDL_Surface * dst, int x, int y, |
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268 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
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269 int status = 0; |
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270 |
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271 if (!dst) { |
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272 SDL_SetError("Passed NULL destination surface"); |
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273 return -1; |
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274 } |
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275 |
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276 /* This function doesn't work on surfaces < 8 bpp */ |
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277 if (dst->format->BitsPerPixel < 8) { |
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278 SDL_SetError("SDL_BlendPoints(): Unsupported surface format"); |
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279 return (-1); |
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280 } |
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281 |
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282 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
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283 r = DRAW_MUL(r, a); |
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284 g = DRAW_MUL(g, a); |
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285 b = DRAW_MUL(b, a); |
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286 } |
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287 |
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288 /* FIXME: Does this function pointer slow things down significantly? */ |
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289 switch (dst->format->BitsPerPixel) { |
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290 case 15: |
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291 switch (dst->format->Rmask) { |
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292 case 0x7C00: |
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293 func = SDL_BlendPoint_RGB555; |
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294 break; |
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295 } |
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296 break; |
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297 case 16: |
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298 switch (dst->format->Rmask) { |
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299 case 0xF800: |
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300 func = SDL_BlendPoint_RGB565; |
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301 break; |
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302 } |
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303 break; |
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304 case 32: |
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305 switch (dst->format->Rmask) { |
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306 case 0x00FF0000: |
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307 if (!dst->format->Amask) { |
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308 func = SDL_BlendPoint_RGB888; |
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309 } else { |
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310 func = SDL_BlendPoint_ARGB8888; |
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311 } |
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312 break; |
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313 } |
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314 break; |
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315 default: |
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316 break; |
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317 } |
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318 |
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319 if (!func) { |
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320 if (!dst->format->Amask) { |
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321 func = SDL_BlendPoint_RGB; |
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322 } else { |
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323 func = SDL_BlendPoint_RGBA; |
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324 } |
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325 } |
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326 |
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327 minx = dst->clip_rect.x; |
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328 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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329 miny = dst->clip_rect.y; |
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330 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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331 |
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332 for (i = 0; i < count; ++i) { |
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333 x = points[i].x; |
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334 y = points[i].y; |
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335 |
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336 if (x < minx || x > maxx || y < miny || y > maxy) { |
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337 continue; |
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338 } |
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339 status = func(dst, x, y, blendMode, r, g, b, a); |
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340 } |
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341 return status; |
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342 } |
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343 |
| 2901 | 344 /* vi: set ts=4 sw=4 expandtab: */ |