Mercurial > sdl-ios-xcode
annotate src/render/software/SDL_blendpoint.c @ 5275:7aba0406c273
Frank Zago to sdl
The following patch fixes some of the bitrot for the Nintendo DS port.
The support is still basic at the moment, but it allows to run the "general"
test under the current head of tree (parent: 5269:11bd1585efb5 tip).
Most of the patch is mine, but I integrated a couple changes that John
Magnotti posted on Feb 1st.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 12 Feb 2011 11:36:56 -0800 |
| parents | b530ef003506 |
| 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: */ |