Mercurial > sdl-ios-xcode
annotate src/render/software/SDL_blendpoint.c @ 5169:4d39eeaad00b
Added a way to get a framebuffer interface for a window, and also a way to create a software renderer for an arbitrary surface.
The software renderer has been re-routed to use the framebuffer interface, which makes it possible to have software rendering available even on simple ports.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 03 Feb 2011 15:49:37 -0800 |
| parents | d72793305335 |
| children | d976b67150c5 |
| 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" | |
|
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25 #include "SDL_blendpoint.h" |
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26 |
| 2901 | 27 |
| 28 static int | |
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29 SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 30 Uint8 g, Uint8 b, Uint8 a) |
| 31 { | |
| 32 unsigned inva = 0xff - a; | |
| 33 | |
| 34 switch (blendMode) { | |
| 35 case SDL_BLENDMODE_BLEND: | |
| 36 DRAW_SETPIXELXY_BLEND_RGB555(x, y); | |
| 37 break; | |
| 38 case SDL_BLENDMODE_ADD: | |
| 39 DRAW_SETPIXELXY_ADD_RGB555(x, y); | |
| 40 break; | |
| 41 default: | |
| 42 DRAW_SETPIXELXY_RGB555(x, y); | |
| 43 break; | |
| 44 } | |
| 45 return 0; | |
| 46 } | |
| 47 | |
| 48 static int | |
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49 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 50 Uint8 g, Uint8 b, Uint8 a) |
| 51 { | |
| 52 unsigned inva = 0xff - a; | |
| 53 | |
| 54 switch (blendMode) { | |
| 55 case SDL_BLENDMODE_BLEND: | |
| 56 DRAW_SETPIXELXY_BLEND_RGB565(x, y); | |
| 57 break; | |
| 58 case SDL_BLENDMODE_ADD: | |
| 59 DRAW_SETPIXELXY_ADD_RGB565(x, y); | |
| 60 break; | |
| 61 default: | |
| 62 DRAW_SETPIXELXY_RGB565(x, y); | |
| 63 break; | |
| 64 } | |
| 65 return 0; | |
| 66 } | |
| 67 | |
| 68 static int | |
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69 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 70 Uint8 g, Uint8 b, Uint8 a) |
| 71 { | |
| 72 unsigned inva = 0xff - a; | |
| 73 | |
| 74 switch (blendMode) { | |
| 75 case SDL_BLENDMODE_BLEND: | |
| 76 DRAW_SETPIXELXY_BLEND_RGB888(x, y); | |
| 77 break; | |
| 78 case SDL_BLENDMODE_ADD: | |
| 79 DRAW_SETPIXELXY_ADD_RGB888(x, y); | |
| 80 break; | |
| 81 default: | |
| 82 DRAW_SETPIXELXY_RGB888(x, y); | |
| 83 break; | |
| 84 } | |
| 85 return 0; | |
| 86 } | |
| 87 | |
| 88 static int | |
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89 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, |
| 2901 | 90 Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| 91 { | |
| 92 unsigned inva = 0xff - a; | |
| 93 | |
| 94 switch (blendMode) { | |
| 95 case SDL_BLENDMODE_BLEND: | |
| 96 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); | |
| 97 break; | |
| 98 case SDL_BLENDMODE_ADD: | |
| 99 DRAW_SETPIXELXY_ADD_ARGB8888(x, y); | |
| 100 break; | |
| 101 default: | |
| 102 DRAW_SETPIXELXY_ARGB8888(x, y); | |
| 103 break; | |
| 104 } | |
| 105 return 0; | |
| 106 } | |
| 107 | |
| 108 static int | |
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109 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 110 Uint8 g, Uint8 b, Uint8 a) |
| 111 { | |
| 112 SDL_PixelFormat *fmt = dst->format; | |
| 113 unsigned inva = 0xff - a; | |
| 114 | |
| 115 switch (fmt->BytesPerPixel) { | |
| 116 case 2: | |
| 117 switch (blendMode) { | |
| 118 case SDL_BLENDMODE_BLEND: | |
| 119 DRAW_SETPIXELXY2_BLEND_RGB(x, y); | |
| 120 break; | |
| 121 case SDL_BLENDMODE_ADD: | |
| 122 DRAW_SETPIXELXY2_ADD_RGB(x, y); | |
| 123 break; | |
| 124 default: | |
| 125 DRAW_SETPIXELXY2_RGB(x, y); | |
| 126 break; | |
| 127 } | |
| 128 return 0; | |
| 129 case 4: | |
| 130 switch (blendMode) { | |
| 131 case SDL_BLENDMODE_BLEND: | |
| 132 DRAW_SETPIXELXY4_BLEND_RGB(x, y); | |
| 133 break; | |
| 134 case SDL_BLENDMODE_ADD: | |
| 135 DRAW_SETPIXELXY4_ADD_RGB(x, y); | |
| 136 break; | |
| 137 default: | |
| 138 DRAW_SETPIXELXY4_RGB(x, y); | |
| 139 break; | |
| 140 } | |
| 141 return 0; | |
| 142 default: | |
| 143 SDL_Unsupported(); | |
| 144 return -1; | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 static int | |
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149 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 150 Uint8 g, Uint8 b, Uint8 a) |
| 151 { | |
| 152 SDL_PixelFormat *fmt = dst->format; | |
| 153 unsigned inva = 0xff - a; | |
| 154 | |
| 155 switch (fmt->BytesPerPixel) { | |
| 156 case 4: | |
| 157 switch (blendMode) { | |
| 158 case SDL_BLENDMODE_BLEND: | |
| 159 DRAW_SETPIXELXY4_BLEND_RGBA(x, y); | |
| 160 break; | |
| 161 case SDL_BLENDMODE_ADD: | |
| 162 DRAW_SETPIXELXY4_ADD_RGBA(x, y); | |
| 163 break; | |
| 164 default: | |
| 165 DRAW_SETPIXELXY4_RGBA(x, y); | |
| 166 break; | |
| 167 } | |
| 168 return 0; | |
| 169 default: | |
| 170 SDL_Unsupported(); | |
| 171 return -1; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 int | |
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176 SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 177 Uint8 g, Uint8 b, Uint8 a) |
| 178 { | |
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179 if (!dst) { |
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180 SDL_SetError("Passed NULL destination surface"); |
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181 return -1; |
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182 } |
| 2901 | 183 |
| 184 /* This function doesn't work on surfaces < 8 bpp */ | |
| 185 if (dst->format->BitsPerPixel < 8) { | |
| 186 SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); | |
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187 return -1; |
| 2901 | 188 } |
| 189 | |
| 190 /* Perform clipping */ | |
| 191 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 192 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 193 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 194 return 0; | |
| 195 } | |
| 196 | |
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197 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| 2901 | 198 r = DRAW_MUL(r, a); |
| 199 g = DRAW_MUL(g, a); | |
| 200 b = DRAW_MUL(b, a); | |
| 201 } | |
| 202 | |
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203 switch (dst->format->BitsPerPixel) { |
| 2901 | 204 case 15: |
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205 switch (dst->format->Rmask) { |
| 2901 | 206 case 0x7C00: |
| 207 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); | |
| 208 } | |
| 209 break; | |
| 210 case 16: | |
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211 switch (dst->format->Rmask) { |
| 2901 | 212 case 0xF800: |
| 213 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); | |
| 214 } | |
| 215 break; | |
| 216 case 32: | |
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217 switch (dst->format->Rmask) { |
| 2901 | 218 case 0x00FF0000: |
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219 if (!dst->format->Amask) { |
| 2901 | 220 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, |
| 221 a); | |
| 222 } else { | |
| 223 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, | |
| 224 a); | |
| 225 } | |
| 226 break; | |
| 227 } | |
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228 break; |
| 2901 | 229 default: |
| 230 break; | |
| 231 } | |
| 232 | |
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233 if (!dst->format->Amask) { |
| 2901 | 234 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); |
| 235 } else { | |
| 236 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); | |
| 237 } | |
| 238 } | |
| 239 | |
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240 int |
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241 SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, |
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242 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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243 { |
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244 int minx, miny; |
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245 int maxx, maxy; |
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246 int i; |
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247 int x, y; |
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248 int (*func)(SDL_Surface * dst, int x, int y, |
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249 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
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250 int status = 0; |
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251 |
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252 if (!dst) { |
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253 SDL_SetError("Passed NULL destination surface"); |
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254 return -1; |
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255 } |
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256 |
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257 /* This function doesn't work on surfaces < 8 bpp */ |
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258 if (dst->format->BitsPerPixel < 8) { |
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259 SDL_SetError("SDL_BlendPoints(): Unsupported surface format"); |
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260 return (-1); |
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261 } |
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262 |
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263 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
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264 r = DRAW_MUL(r, a); |
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265 g = DRAW_MUL(g, a); |
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266 b = DRAW_MUL(b, a); |
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267 } |
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268 |
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269 /* FIXME: Does this function pointer slow things down significantly? */ |
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270 switch (dst->format->BitsPerPixel) { |
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271 case 15: |
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272 switch (dst->format->Rmask) { |
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273 case 0x7C00: |
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274 func = SDL_BlendPoint_RGB555; |
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275 break; |
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276 } |
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277 break; |
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278 case 16: |
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279 switch (dst->format->Rmask) { |
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280 case 0xF800: |
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281 func = SDL_BlendPoint_RGB565; |
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282 break; |
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283 } |
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284 break; |
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285 case 32: |
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286 switch (dst->format->Rmask) { |
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287 case 0x00FF0000: |
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288 if (!dst->format->Amask) { |
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289 func = SDL_BlendPoint_RGB888; |
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290 } else { |
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291 func = SDL_BlendPoint_ARGB8888; |
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292 } |
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293 break; |
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294 } |
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295 break; |
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296 default: |
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297 break; |
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298 } |
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299 |
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300 if (!func) { |
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301 if (!dst->format->Amask) { |
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302 func = SDL_BlendPoint_RGB; |
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303 } else { |
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304 func = SDL_BlendPoint_RGBA; |
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305 } |
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306 } |
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307 |
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308 minx = dst->clip_rect.x; |
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309 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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310 miny = dst->clip_rect.y; |
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311 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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312 |
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313 for (i = 0; i < count; ++i) { |
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314 x = points[i].x; |
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315 y = points[i].y; |
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316 |
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317 if (x < minx || x > maxx || y < miny || y > maxy) { |
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318 continue; |
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319 } |
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320 status = func(dst, x, y, blendMode, r, g, b, a); |
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321 } |
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322 return status; |
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323 } |
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324 |
| 2901 | 325 /* vi: set ts=4 sw=4 expandtab: */ |