Mercurial > sdl-ios-xcode
annotate src/video/SDL_blendpoint.c @ 4629:44fd1f0b895a
Fixed a huge bug with texture scaling.
| author | Sunny Sachanandani <sunnysachanandani@gmail.com> |
|---|---|
| date | Mon, 02 Aug 2010 11:13:40 +0530 |
| parents | f7b03b6838cb |
| children | aa8888658021 |
| 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 | |
| 27 SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 | |
| 50 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 | |
| 73 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 | |
| 96 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, int blendMode, | |
| 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 | |
| 119 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 | |
| 165 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 | |
| 195 SDL_BlendPoint(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r, | |
| 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 int 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 int 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: */ |