Mercurial > sdl-ios-xcode
annotate src/render/software/SDL_blendpoint.c @ 5267:b530ef003506
Happy 2011! :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 11 Feb 2011 22:37:15 -0800 |
| parents | 710d00cb3a6a |
| children |
| rev | line source |
|---|---|
| 2901 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 5267 | 3 Copyright (C) 1997-2011 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 | |
|
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24 #if !SDL_RENDER_DISABLED |
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25 |
| 2901 | 26 #include "SDL_draw.h" |
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27 #include "SDL_blendpoint.h" |
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28 |
| 2901 | 29 |
| 30 static int | |
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31 SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 32 Uint8 g, Uint8 b, Uint8 a) |
| 33 { | |
| 34 unsigned inva = 0xff - a; | |
| 35 | |
| 36 switch (blendMode) { | |
| 37 case SDL_BLENDMODE_BLEND: | |
| 38 DRAW_SETPIXELXY_BLEND_RGB555(x, y); | |
| 39 break; | |
| 40 case SDL_BLENDMODE_ADD: | |
| 41 DRAW_SETPIXELXY_ADD_RGB555(x, y); | |
| 42 break; | |
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43 case SDL_BLENDMODE_MOD: |
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44 DRAW_SETPIXELXY_MOD_RGB555(x, y); |
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45 break; |
| 2901 | 46 default: |
| 47 DRAW_SETPIXELXY_RGB555(x, y); | |
| 48 break; | |
| 49 } | |
| 50 return 0; | |
| 51 } | |
| 52 | |
| 53 static int | |
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54 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 55 Uint8 g, Uint8 b, Uint8 a) |
| 56 { | |
| 57 unsigned inva = 0xff - a; | |
| 58 | |
| 59 switch (blendMode) { | |
| 60 case SDL_BLENDMODE_BLEND: | |
| 61 DRAW_SETPIXELXY_BLEND_RGB565(x, y); | |
| 62 break; | |
| 63 case SDL_BLENDMODE_ADD: | |
| 64 DRAW_SETPIXELXY_ADD_RGB565(x, y); | |
| 65 break; | |
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66 case SDL_BLENDMODE_MOD: |
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67 DRAW_SETPIXELXY_MOD_RGB565(x, y); |
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68 break; |
| 2901 | 69 default: |
| 70 DRAW_SETPIXELXY_RGB565(x, y); | |
| 71 break; | |
| 72 } | |
| 73 return 0; | |
| 74 } | |
| 75 | |
| 76 static int | |
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77 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 78 Uint8 g, Uint8 b, Uint8 a) |
| 79 { | |
| 80 unsigned inva = 0xff - a; | |
| 81 | |
| 82 switch (blendMode) { | |
| 83 case SDL_BLENDMODE_BLEND: | |
| 84 DRAW_SETPIXELXY_BLEND_RGB888(x, y); | |
| 85 break; | |
| 86 case SDL_BLENDMODE_ADD: | |
| 87 DRAW_SETPIXELXY_ADD_RGB888(x, y); | |
| 88 break; | |
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89 case SDL_BLENDMODE_MOD: |
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90 DRAW_SETPIXELXY_MOD_RGB888(x, y); |
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91 break; |
| 2901 | 92 default: |
| 93 DRAW_SETPIXELXY_RGB888(x, y); | |
| 94 break; | |
| 95 } | |
| 96 return 0; | |
| 97 } | |
| 98 | |
| 99 static int | |
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100 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, |
| 2901 | 101 Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| 102 { | |
| 103 unsigned inva = 0xff - a; | |
| 104 | |
| 105 switch (blendMode) { | |
| 106 case SDL_BLENDMODE_BLEND: | |
| 107 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); | |
| 108 break; | |
| 109 case SDL_BLENDMODE_ADD: | |
| 110 DRAW_SETPIXELXY_ADD_ARGB8888(x, y); | |
| 111 break; | |
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112 case SDL_BLENDMODE_MOD: |
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113 DRAW_SETPIXELXY_MOD_ARGB8888(x, y); |
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114 break; |
| 2901 | 115 default: |
| 116 DRAW_SETPIXELXY_ARGB8888(x, y); | |
| 117 break; | |
| 118 } | |
| 119 return 0; | |
| 120 } | |
| 121 | |
| 122 static int | |
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123 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 124 Uint8 g, Uint8 b, Uint8 a) |
| 125 { | |
| 126 SDL_PixelFormat *fmt = dst->format; | |
| 127 unsigned inva = 0xff - a; | |
| 128 | |
| 129 switch (fmt->BytesPerPixel) { | |
| 130 case 2: | |
| 131 switch (blendMode) { | |
| 132 case SDL_BLENDMODE_BLEND: | |
| 133 DRAW_SETPIXELXY2_BLEND_RGB(x, y); | |
| 134 break; | |
| 135 case SDL_BLENDMODE_ADD: | |
| 136 DRAW_SETPIXELXY2_ADD_RGB(x, y); | |
| 137 break; | |
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138 case SDL_BLENDMODE_MOD: |
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139 DRAW_SETPIXELXY2_MOD_RGB(x, y); |
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140 break; |
| 2901 | 141 default: |
| 142 DRAW_SETPIXELXY2_RGB(x, y); | |
| 143 break; | |
| 144 } | |
| 145 return 0; | |
| 146 case 4: | |
| 147 switch (blendMode) { | |
| 148 case SDL_BLENDMODE_BLEND: | |
| 149 DRAW_SETPIXELXY4_BLEND_RGB(x, y); | |
| 150 break; | |
| 151 case SDL_BLENDMODE_ADD: | |
| 152 DRAW_SETPIXELXY4_ADD_RGB(x, y); | |
| 153 break; | |
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154 case SDL_BLENDMODE_MOD: |
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155 DRAW_SETPIXELXY4_MOD_RGB(x, y); |
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156 break; |
| 2901 | 157 default: |
| 158 DRAW_SETPIXELXY4_RGB(x, y); | |
| 159 break; | |
| 160 } | |
| 161 return 0; | |
| 162 default: | |
| 163 SDL_Unsupported(); | |
| 164 return -1; | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 static int | |
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169 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 170 Uint8 g, Uint8 b, Uint8 a) |
| 171 { | |
| 172 SDL_PixelFormat *fmt = dst->format; | |
| 173 unsigned inva = 0xff - a; | |
| 174 | |
| 175 switch (fmt->BytesPerPixel) { | |
| 176 case 4: | |
| 177 switch (blendMode) { | |
| 178 case SDL_BLENDMODE_BLEND: | |
| 179 DRAW_SETPIXELXY4_BLEND_RGBA(x, y); | |
| 180 break; | |
| 181 case SDL_BLENDMODE_ADD: | |
| 182 DRAW_SETPIXELXY4_ADD_RGBA(x, y); | |
| 183 break; | |
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184 case SDL_BLENDMODE_MOD: |
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185 DRAW_SETPIXELXY4_MOD_RGBA(x, y); |
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186 break; |
| 2901 | 187 default: |
| 188 DRAW_SETPIXELXY4_RGBA(x, y); | |
| 189 break; | |
| 190 } | |
| 191 return 0; | |
| 192 default: | |
| 193 SDL_Unsupported(); | |
| 194 return -1; | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 int | |
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199 SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 200 Uint8 g, Uint8 b, Uint8 a) |
| 201 { | |
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202 if (!dst) { |
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203 SDL_SetError("Passed NULL destination surface"); |
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204 return -1; |
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205 } |
| 2901 | 206 |
| 207 /* This function doesn't work on surfaces < 8 bpp */ | |
| 208 if (dst->format->BitsPerPixel < 8) { | |
| 209 SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); | |
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210 return -1; |
| 2901 | 211 } |
| 212 | |
| 213 /* Perform clipping */ | |
| 214 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 215 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 216 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 217 return 0; | |
| 218 } | |
| 219 | |
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220 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| 2901 | 221 r = DRAW_MUL(r, a); |
| 222 g = DRAW_MUL(g, a); | |
| 223 b = DRAW_MUL(b, a); | |
| 224 } | |
| 225 | |
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226 switch (dst->format->BitsPerPixel) { |
| 2901 | 227 case 15: |
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228 switch (dst->format->Rmask) { |
| 2901 | 229 case 0x7C00: |
| 230 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); | |
| 231 } | |
| 232 break; | |
| 233 case 16: | |
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234 switch (dst->format->Rmask) { |
| 2901 | 235 case 0xF800: |
| 236 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); | |
| 237 } | |
| 238 break; | |
| 239 case 32: | |
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240 switch (dst->format->Rmask) { |
| 2901 | 241 case 0x00FF0000: |
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242 if (!dst->format->Amask) { |
| 2901 | 243 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, |
| 244 a); | |
| 245 } else { | |
| 246 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, | |
| 247 a); | |
| 248 } | |
| 249 break; | |
| 250 } | |
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251 break; |
| 2901 | 252 default: |
| 253 break; | |
| 254 } | |
| 255 | |
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256 if (!dst->format->Amask) { |
| 2901 | 257 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); |
| 258 } else { | |
| 259 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); | |
| 260 } | |
| 261 } | |
| 262 | |
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263 int |
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264 SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, |
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265 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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266 { |
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267 int minx, miny; |
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268 int maxx, maxy; |
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269 int i; |
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270 int x, y; |
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271 int (*func)(SDL_Surface * dst, int x, int y, |
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272 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
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273 int status = 0; |
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274 |
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275 if (!dst) { |
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276 SDL_SetError("Passed NULL destination surface"); |
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277 return -1; |
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278 } |
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279 |
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280 /* This function doesn't work on surfaces < 8 bpp */ |
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281 if (dst->format->BitsPerPixel < 8) { |
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282 SDL_SetError("SDL_BlendPoints(): Unsupported surface format"); |
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283 return (-1); |
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284 } |
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285 |
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286 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
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287 r = DRAW_MUL(r, a); |
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288 g = DRAW_MUL(g, a); |
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289 b = DRAW_MUL(b, a); |
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290 } |
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291 |
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292 /* FIXME: Does this function pointer slow things down significantly? */ |
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293 switch (dst->format->BitsPerPixel) { |
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294 case 15: |
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295 switch (dst->format->Rmask) { |
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296 case 0x7C00: |
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297 func = SDL_BlendPoint_RGB555; |
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298 break; |
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299 } |
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300 break; |
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301 case 16: |
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302 switch (dst->format->Rmask) { |
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303 case 0xF800: |
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304 func = SDL_BlendPoint_RGB565; |
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305 break; |
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306 } |
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307 break; |
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308 case 32: |
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309 switch (dst->format->Rmask) { |
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310 case 0x00FF0000: |
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311 if (!dst->format->Amask) { |
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312 func = SDL_BlendPoint_RGB888; |
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313 } else { |
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314 func = SDL_BlendPoint_ARGB8888; |
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315 } |
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316 break; |
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317 } |
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318 break; |
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319 default: |
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320 break; |
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321 } |
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322 |
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323 if (!func) { |
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324 if (!dst->format->Amask) { |
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325 func = SDL_BlendPoint_RGB; |
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326 } else { |
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327 func = SDL_BlendPoint_RGBA; |
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328 } |
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329 } |
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330 |
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331 minx = dst->clip_rect.x; |
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332 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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333 miny = dst->clip_rect.y; |
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334 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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335 |
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336 for (i = 0; i < count; ++i) { |
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337 x = points[i].x; |
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338 y = points[i].y; |
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339 |
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340 if (x < minx || x > maxx || y < miny || y > maxy) { |
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341 continue; |
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342 } |
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343 status = func(dst, x, y, blendMode, r, g, b, a); |
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344 } |
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345 return status; |
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346 } |
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347 |
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348 #endif /* !SDL_RENDER_DISABLED */ |
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349 |
| 2901 | 350 /* vi: set ts=4 sw=4 expandtab: */ |