Mercurial > sdl-ios-xcode
annotate src/render/software/SDL_blendpoint.c @ 5217:b0797947dd1c
You don't need to copy the pixels into the streaming texture's pixel data. This behavior is defined specifically to optimize the UpdateTexture path.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 06 Feb 2011 20:56:21 -0800 |
| parents | d976b67150c5 |
| children | 710d00cb3a6a |
| 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; | |
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41 case SDL_BLENDMODE_MOD: |
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42 DRAW_SETPIXELXY_MOD_RGB555(x, y); |
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43 break; |
| 2901 | 44 default: |
| 45 DRAW_SETPIXELXY_RGB555(x, y); | |
| 46 break; | |
| 47 } | |
| 48 return 0; | |
| 49 } | |
| 50 | |
| 51 static int | |
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52 SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 53 Uint8 g, Uint8 b, Uint8 a) |
| 54 { | |
| 55 unsigned inva = 0xff - a; | |
| 56 | |
| 57 switch (blendMode) { | |
| 58 case SDL_BLENDMODE_BLEND: | |
| 59 DRAW_SETPIXELXY_BLEND_RGB565(x, y); | |
| 60 break; | |
| 61 case SDL_BLENDMODE_ADD: | |
| 62 DRAW_SETPIXELXY_ADD_RGB565(x, y); | |
| 63 break; | |
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64 case SDL_BLENDMODE_MOD: |
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65 DRAW_SETPIXELXY_MOD_RGB565(x, y); |
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66 break; |
| 2901 | 67 default: |
| 68 DRAW_SETPIXELXY_RGB565(x, y); | |
| 69 break; | |
| 70 } | |
| 71 return 0; | |
| 72 } | |
| 73 | |
| 74 static int | |
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75 SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 76 Uint8 g, Uint8 b, Uint8 a) |
| 77 { | |
| 78 unsigned inva = 0xff - a; | |
| 79 | |
| 80 switch (blendMode) { | |
| 81 case SDL_BLENDMODE_BLEND: | |
| 82 DRAW_SETPIXELXY_BLEND_RGB888(x, y); | |
| 83 break; | |
| 84 case SDL_BLENDMODE_ADD: | |
| 85 DRAW_SETPIXELXY_ADD_RGB888(x, y); | |
| 86 break; | |
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87 case SDL_BLENDMODE_MOD: |
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88 DRAW_SETPIXELXY_MOD_RGB888(x, y); |
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89 break; |
| 2901 | 90 default: |
| 91 DRAW_SETPIXELXY_RGB888(x, y); | |
| 92 break; | |
| 93 } | |
| 94 return 0; | |
| 95 } | |
| 96 | |
| 97 static int | |
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98 SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, |
| 2901 | 99 Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| 100 { | |
| 101 unsigned inva = 0xff - a; | |
| 102 | |
| 103 switch (blendMode) { | |
| 104 case SDL_BLENDMODE_BLEND: | |
| 105 DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); | |
| 106 break; | |
| 107 case SDL_BLENDMODE_ADD: | |
| 108 DRAW_SETPIXELXY_ADD_ARGB8888(x, y); | |
| 109 break; | |
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110 case SDL_BLENDMODE_MOD: |
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111 DRAW_SETPIXELXY_MOD_ARGB8888(x, y); |
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112 break; |
| 2901 | 113 default: |
| 114 DRAW_SETPIXELXY_ARGB8888(x, y); | |
| 115 break; | |
| 116 } | |
| 117 return 0; | |
| 118 } | |
| 119 | |
| 120 static int | |
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121 SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 122 Uint8 g, Uint8 b, Uint8 a) |
| 123 { | |
| 124 SDL_PixelFormat *fmt = dst->format; | |
| 125 unsigned inva = 0xff - a; | |
| 126 | |
| 127 switch (fmt->BytesPerPixel) { | |
| 128 case 2: | |
| 129 switch (blendMode) { | |
| 130 case SDL_BLENDMODE_BLEND: | |
| 131 DRAW_SETPIXELXY2_BLEND_RGB(x, y); | |
| 132 break; | |
| 133 case SDL_BLENDMODE_ADD: | |
| 134 DRAW_SETPIXELXY2_ADD_RGB(x, y); | |
| 135 break; | |
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136 case SDL_BLENDMODE_MOD: |
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137 DRAW_SETPIXELXY2_MOD_RGB(x, y); |
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138 break; |
| 2901 | 139 default: |
| 140 DRAW_SETPIXELXY2_RGB(x, y); | |
| 141 break; | |
| 142 } | |
| 143 return 0; | |
| 144 case 4: | |
| 145 switch (blendMode) { | |
| 146 case SDL_BLENDMODE_BLEND: | |
| 147 DRAW_SETPIXELXY4_BLEND_RGB(x, y); | |
| 148 break; | |
| 149 case SDL_BLENDMODE_ADD: | |
| 150 DRAW_SETPIXELXY4_ADD_RGB(x, y); | |
| 151 break; | |
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152 case SDL_BLENDMODE_MOD: |
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153 DRAW_SETPIXELXY4_MOD_RGB(x, y); |
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154 break; |
| 2901 | 155 default: |
| 156 DRAW_SETPIXELXY4_RGB(x, y); | |
| 157 break; | |
| 158 } | |
| 159 return 0; | |
| 160 default: | |
| 161 SDL_Unsupported(); | |
| 162 return -1; | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 static int | |
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167 SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 168 Uint8 g, Uint8 b, Uint8 a) |
| 169 { | |
| 170 SDL_PixelFormat *fmt = dst->format; | |
| 171 unsigned inva = 0xff - a; | |
| 172 | |
| 173 switch (fmt->BytesPerPixel) { | |
| 174 case 4: | |
| 175 switch (blendMode) { | |
| 176 case SDL_BLENDMODE_BLEND: | |
| 177 DRAW_SETPIXELXY4_BLEND_RGBA(x, y); | |
| 178 break; | |
| 179 case SDL_BLENDMODE_ADD: | |
| 180 DRAW_SETPIXELXY4_ADD_RGBA(x, y); | |
| 181 break; | |
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182 case SDL_BLENDMODE_MOD: |
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183 DRAW_SETPIXELXY4_MOD_RGBA(x, y); |
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184 break; |
| 2901 | 185 default: |
| 186 DRAW_SETPIXELXY4_RGBA(x, y); | |
| 187 break; | |
| 188 } | |
| 189 return 0; | |
| 190 default: | |
| 191 SDL_Unsupported(); | |
| 192 return -1; | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 int | |
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197 SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, |
| 2901 | 198 Uint8 g, Uint8 b, Uint8 a) |
| 199 { | |
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200 if (!dst) { |
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201 SDL_SetError("Passed NULL destination surface"); |
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202 return -1; |
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203 } |
| 2901 | 204 |
| 205 /* This function doesn't work on surfaces < 8 bpp */ | |
| 206 if (dst->format->BitsPerPixel < 8) { | |
| 207 SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); | |
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208 return -1; |
| 2901 | 209 } |
| 210 | |
| 211 /* Perform clipping */ | |
| 212 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 213 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 214 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 215 return 0; | |
| 216 } | |
| 217 | |
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218 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| 2901 | 219 r = DRAW_MUL(r, a); |
| 220 g = DRAW_MUL(g, a); | |
| 221 b = DRAW_MUL(b, a); | |
| 222 } | |
| 223 | |
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224 switch (dst->format->BitsPerPixel) { |
| 2901 | 225 case 15: |
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226 switch (dst->format->Rmask) { |
| 2901 | 227 case 0x7C00: |
| 228 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); | |
| 229 } | |
| 230 break; | |
| 231 case 16: | |
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232 switch (dst->format->Rmask) { |
| 2901 | 233 case 0xF800: |
| 234 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); | |
| 235 } | |
| 236 break; | |
| 237 case 32: | |
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238 switch (dst->format->Rmask) { |
| 2901 | 239 case 0x00FF0000: |
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240 if (!dst->format->Amask) { |
| 2901 | 241 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, |
| 242 a); | |
| 243 } else { | |
| 244 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, | |
| 245 a); | |
| 246 } | |
| 247 break; | |
| 248 } | |
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249 break; |
| 2901 | 250 default: |
| 251 break; | |
| 252 } | |
| 253 | |
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254 if (!dst->format->Amask) { |
| 2901 | 255 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); |
| 256 } else { | |
| 257 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); | |
| 258 } | |
| 259 } | |
| 260 | |
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261 int |
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262 SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, |
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263 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
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264 { |
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265 int minx, miny; |
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266 int maxx, maxy; |
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267 int i; |
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268 int x, y; |
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269 int (*func)(SDL_Surface * dst, int x, int y, |
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270 SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
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271 int status = 0; |
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272 |
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273 if (!dst) { |
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274 SDL_SetError("Passed NULL destination surface"); |
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275 return -1; |
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276 } |
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277 |
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278 /* This function doesn't work on surfaces < 8 bpp */ |
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279 if (dst->format->BitsPerPixel < 8) { |
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280 SDL_SetError("SDL_BlendPoints(): Unsupported surface format"); |
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281 return (-1); |
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282 } |
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283 |
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284 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
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285 r = DRAW_MUL(r, a); |
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286 g = DRAW_MUL(g, a); |
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287 b = DRAW_MUL(b, a); |
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288 } |
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289 |
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290 /* FIXME: Does this function pointer slow things down significantly? */ |
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291 switch (dst->format->BitsPerPixel) { |
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292 case 15: |
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293 switch (dst->format->Rmask) { |
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294 case 0x7C00: |
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295 func = SDL_BlendPoint_RGB555; |
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296 break; |
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297 } |
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298 break; |
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299 case 16: |
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300 switch (dst->format->Rmask) { |
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301 case 0xF800: |
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302 func = SDL_BlendPoint_RGB565; |
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303 break; |
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304 } |
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305 break; |
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306 case 32: |
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307 switch (dst->format->Rmask) { |
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308 case 0x00FF0000: |
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309 if (!dst->format->Amask) { |
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310 func = SDL_BlendPoint_RGB888; |
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311 } else { |
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312 func = SDL_BlendPoint_ARGB8888; |
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313 } |
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314 break; |
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315 } |
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316 break; |
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317 default: |
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318 break; |
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319 } |
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320 |
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321 if (!func) { |
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322 if (!dst->format->Amask) { |
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323 func = SDL_BlendPoint_RGB; |
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324 } else { |
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325 func = SDL_BlendPoint_RGBA; |
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326 } |
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327 } |
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328 |
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329 minx = dst->clip_rect.x; |
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330 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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331 miny = dst->clip_rect.y; |
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332 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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333 |
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334 for (i = 0; i < count; ++i) { |
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335 x = points[i].x; |
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336 y = points[i].y; |
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337 |
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338 if (x < minx || x > maxx || y < miny || y > maxy) { |
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339 continue; |
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340 } |
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341 status = func(dst, x, y, blendMode, r, g, b, a); |
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342 } |
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343 return status; |
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344 } |
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345 |
| 2901 | 346 /* vi: set ts=4 sw=4 expandtab: */ |