Mercurial > sdl-ios-xcode
annotate src/video/SDL_blendpoint.c @ 5148:2f44e6969a59
Split the rendering API out into a separate header file.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 01 Feb 2011 15:02:21 -0800 |
| parents | e743b9c3f6d6 |
| children |
| 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 default: | |
| 40 DRAW_SETPIXELXY_RGB555(x, y); | |
| 41 break; | |
| 42 } | |
| 43 return 0; | |
| 44 } | |
| 45 | |
| 46 static int | |
|
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47 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 48 Uint8 g, Uint8 b, Uint8 a) |
| 49 { | |
| 50 unsigned inva = 0xff - a; | |
| 51 | |
| 52 switch (blendMode) { | |
| 53 case SDL_BLENDMODE_BLEND: | |
| 54 DRAW_SETPIXELXY_BLEND_RGB565(x, y); | |
| 55 break; | |
| 56 case SDL_BLENDMODE_ADD: | |
| 57 DRAW_SETPIXELXY_ADD_RGB565(x, y); | |
| 58 break; | |
| 59 default: | |
| 60 DRAW_SETPIXELXY_RGB565(x, y); | |
| 61 break; | |
| 62 } | |
| 63 return 0; | |
| 64 } | |
| 65 | |
| 66 static int | |
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67 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 68 Uint8 g, Uint8 b, Uint8 a) |
| 69 { | |
| 70 unsigned inva = 0xff - a; | |
| 71 | |
| 72 switch (blendMode) { | |
| 73 case SDL_BLENDMODE_BLEND: | |
| 74 DRAW_SETPIXELXY_BLEND_RGB888(x, y); | |
| 75 break; | |
| 76 case SDL_BLENDMODE_ADD: | |
| 77 DRAW_SETPIXELXY_ADD_RGB888(x, y); | |
| 78 break; | |
| 79 default: | |
| 80 DRAW_SETPIXELXY_RGB888(x, y); | |
| 81 break; | |
| 82 } | |
| 83 return 0; | |
| 84 } | |
| 85 | |
| 86 static int | |
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87 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, |
| 2901 | 88 Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| 89 { | |
| 90 unsigned inva = 0xff - a; | |
| 91 | |
| 92 switch (blendMode) { | |
| 93 case SDL_BLENDMODE_BLEND: | |
| 94 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); | |
| 95 break; | |
| 96 case SDL_BLENDMODE_ADD: | |
| 97 DRAW_SETPIXELXY_ADD_ARGB8888(x, y); | |
| 98 break; | |
| 99 default: | |
| 100 DRAW_SETPIXELXY_ARGB8888(x, y); | |
| 101 break; | |
| 102 } | |
| 103 return 0; | |
| 104 } | |
| 105 | |
| 106 static int | |
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107 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 108 Uint8 g, Uint8 b, Uint8 a) |
| 109 { | |
| 110 SDL_PixelFormat *fmt = dst->format; | |
| 111 unsigned inva = 0xff - a; | |
| 112 | |
| 113 switch (fmt->BytesPerPixel) { | |
| 114 case 2: | |
| 115 switch (blendMode) { | |
| 116 case SDL_BLENDMODE_BLEND: | |
| 117 DRAW_SETPIXELXY2_BLEND_RGB(x, y); | |
| 118 break; | |
| 119 case SDL_BLENDMODE_ADD: | |
| 120 DRAW_SETPIXELXY2_ADD_RGB(x, y); | |
| 121 break; | |
| 122 default: | |
| 123 DRAW_SETPIXELXY2_RGB(x, y); | |
| 124 break; | |
| 125 } | |
| 126 return 0; | |
| 127 case 4: | |
| 128 switch (blendMode) { | |
| 129 case SDL_BLENDMODE_BLEND: | |
| 130 DRAW_SETPIXELXY4_BLEND_RGB(x, y); | |
| 131 break; | |
| 132 case SDL_BLENDMODE_ADD: | |
| 133 DRAW_SETPIXELXY4_ADD_RGB(x, y); | |
| 134 break; | |
| 135 default: | |
| 136 DRAW_SETPIXELXY4_RGB(x, y); | |
| 137 break; | |
| 138 } | |
| 139 return 0; | |
| 140 default: | |
| 141 SDL_Unsupported(); | |
| 142 return -1; | |
| 143 } | |
| 144 } | |
| 145 | |
| 146 static int | |
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147 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 148 Uint8 g, Uint8 b, Uint8 a) |
| 149 { | |
| 150 SDL_PixelFormat *fmt = dst->format; | |
| 151 unsigned inva = 0xff - a; | |
| 152 | |
| 153 switch (fmt->BytesPerPixel) { | |
| 154 case 4: | |
| 155 switch (blendMode) { | |
| 156 case SDL_BLENDMODE_BLEND: | |
| 157 DRAW_SETPIXELXY4_BLEND_RGBA(x, y); | |
| 158 break; | |
| 159 case SDL_BLENDMODE_ADD: | |
| 160 DRAW_SETPIXELXY4_ADD_RGBA(x, y); | |
| 161 break; | |
| 162 default: | |
| 163 DRAW_SETPIXELXY4_RGBA(x, y); | |
| 164 break; | |
| 165 } | |
| 166 return 0; | |
| 167 default: | |
| 168 SDL_Unsupported(); | |
| 169 return -1; | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 int | |
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174 SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 175 Uint8 g, Uint8 b, Uint8 a) |
| 176 { | |
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177 if (!dst) { |
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178 SDL_SetError("Passed NULL destination surface"); |
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179 return -1; |
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180 } |
| 2901 | 181 |
| 182 /* This function doesn't work on surfaces < 8 bpp */ | |
| 183 if (dst->format->BitsPerPixel < 8) { | |
| 184 SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); | |
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185 return -1; |
| 2901 | 186 } |
| 187 | |
| 188 /* Perform clipping */ | |
| 189 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 190 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 191 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 192 return 0; | |
| 193 } | |
| 194 | |
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195 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| 2901 | 196 r = DRAW_MUL(r, a); |
| 197 g = DRAW_MUL(g, a); | |
| 198 b = DRAW_MUL(b, a); | |
| 199 } | |
| 200 | |
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201 switch (dst->format->BitsPerPixel) { |
| 2901 | 202 case 15: |
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203 switch (dst->format->Rmask) { |
| 2901 | 204 case 0x7C00: |
| 205 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); | |
| 206 } | |
| 207 break; | |
| 208 case 16: | |
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209 switch (dst->format->Rmask) { |
| 2901 | 210 case 0xF800: |
| 211 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); | |
| 212 } | |
| 213 break; | |
| 214 case 32: | |
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215 switch (dst->format->Rmask) { |
| 2901 | 216 case 0x00FF0000: |
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217 if (!dst->format->Amask) { |
| 2901 | 218 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, |
| 219 a); | |
| 220 } else { | |
| 221 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, | |
| 222 a); | |
| 223 } | |
| 224 break; | |
| 225 } | |
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226 break; |
| 2901 | 227 default: |
| 228 break; | |
| 229 } | |
| 230 | |
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231 if (!dst->format->Amask) { |
| 2901 | 232 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); |
| 233 } else { | |
| 234 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); | |
| 235 } | |
| 236 } | |
| 237 | |
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238 int |
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239 SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, |
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240 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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241 { |
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242 int minx, miny; |
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243 int maxx, maxy; |
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244 int i; |
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245 int x, y; |
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246 int (*func)(SDL_Surface * dst, int x, int y, |
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247 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
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248 int status = 0; |
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249 |
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250 if (!dst) { |
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251 SDL_SetError("Passed NULL destination surface"); |
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252 return -1; |
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253 } |
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254 |
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255 /* This function doesn't work on surfaces < 8 bpp */ |
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256 if (dst->format->BitsPerPixel < 8) { |
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257 SDL_SetError("SDL_BlendPoints(): Unsupported surface format"); |
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258 return (-1); |
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259 } |
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260 |
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261 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
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262 r = DRAW_MUL(r, a); |
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263 g = DRAW_MUL(g, a); |
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264 b = DRAW_MUL(b, a); |
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265 } |
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266 |
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267 /* FIXME: Does this function pointer slow things down significantly? */ |
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268 switch (dst->format->BitsPerPixel) { |
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269 case 15: |
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270 switch (dst->format->Rmask) { |
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271 case 0x7C00: |
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272 func = SDL_BlendPoint_RGB555; |
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273 break; |
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274 } |
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275 break; |
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276 case 16: |
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277 switch (dst->format->Rmask) { |
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278 case 0xF800: |
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279 func = SDL_BlendPoint_RGB565; |
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280 break; |
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281 } |
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282 break; |
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283 case 32: |
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284 switch (dst->format->Rmask) { |
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285 case 0x00FF0000: |
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286 if (!dst->format->Amask) { |
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287 func = SDL_BlendPoint_RGB888; |
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288 } else { |
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289 func = SDL_BlendPoint_ARGB8888; |
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290 } |
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291 break; |
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292 } |
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293 break; |
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294 default: |
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295 break; |
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296 } |
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297 |
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298 if (!func) { |
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299 if (!dst->format->Amask) { |
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300 func = SDL_BlendPoint_RGB; |
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301 } else { |
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302 func = SDL_BlendPoint_RGBA; |
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303 } |
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304 } |
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305 |
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306 minx = dst->clip_rect.x; |
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307 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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308 miny = dst->clip_rect.y; |
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309 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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310 |
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311 for (i = 0; i < count; ++i) { |
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312 x = points[i].x; |
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313 y = points[i].y; |
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314 |
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315 if (x < minx || x > maxx || y < miny || y > maxy) { |
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316 continue; |
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317 } |
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318 status = func(dst, x, y, blendMode, r, g, b, a); |
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319 } |
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320 return status; |
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321 } |
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322 |
| 2901 | 323 /* vi: set ts=4 sw=4 expandtab: */ |