| 1 | /*␊ |
| 2 | * Copyright (c) 1995-2002 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * The contents of this file constitute Original Code as defined in and␊ |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the␊ |
| 8 | * "License"). You may not use this file except in compliance with the␊ |
| 9 | * License. Please obtain a copy of the License at␊ |
| 10 | * http://www.apple.com/publicsource and read it before using this file.␊ |
| 11 | * ␊ |
| 12 | * This Original Code and all software distributed under the License are␊ |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the␊ |
| 17 | * License for the specific language governing rights and limitations␊ |
| 18 | * under the License.␊ |
| 19 | * ␊ |
| 20 | * @APPLE_LICENSE_HEADER_END@␊ |
| 21 | */␊ |
| 22 | #include "bmdecompress.h"␊ |
| 23 | ␊ |
| 24 | typedef uint8_t UInt8;␊ |
| 25 | typedef uint16_t UInt16;␊ |
| 26 | typedef int8_t SInt8;␊ |
| 27 | typedef int16_t SInt16;␊ |
| 28 | static void ␊ |
| 29 | PreviewDecompress16(uint32_t * compressBuffer, ␊ |
| 30 | ␉␉␉␉␉uint32_t width, uint32_t height, uint32_t row, ␊ |
| 31 | ␉␉␉␉␉uint16_t * output);␊ |
| 32 | static void ␊ |
| 33 | PreviewDecompress32(uint32_t * compressBuffer, ␊ |
| 34 | ␉␉␉␉␉uint32_t width, uint32_t height, uint32_t row, ␊ |
| 35 | ␉␉␉␉␉uint32_t * output);␊ |
| 36 | ␊ |
| 37 | static void ␊ |
| 38 | PreviewDecompress16(uint32_t * compressBuffer, ␊ |
| 39 | uint32_t width, uint32_t height, uint32_t row, ␊ |
| 40 | uint16_t * output)␊ |
| 41 | {␊ |
| 42 | int i, j;␊ |
| 43 | uint32_t * input;␊ |
| 44 | ␊ |
| 45 | uint16_t * sc0 = malloc((width+2) * sizeof(uint16_t));␊ |
| 46 | uint16_t * sc1 = malloc((width+2) * sizeof(uint16_t));␊ |
| 47 | uint16_t * sc2 = malloc((width+2) * sizeof(uint16_t));␊ |
| 48 | uint16_t * sc3 = malloc((width+2) * sizeof(uint16_t));␊ |
| 49 | ␉␊ |
| 50 | ␉if (!sc0 || !sc1 || !sc2 || !sc3) return;␊ |
| 51 | ␉␊ |
| 52 | uint32_t sr0, sr1, sr2, sr3;␊ |
| 53 | ␊ |
| 54 | bzero(sc0, (width+2) * sizeof(uint16_t));␊ |
| 55 | bzero(sc1, (width+2) * sizeof(uint16_t));␊ |
| 56 | bzero(sc2, (width+2) * sizeof(uint16_t));␊ |
| 57 | bzero(sc3, (width+2) * sizeof(uint16_t));␊ |
| 58 | ␊ |
| 59 | uint32_t tmp1, tmp2, out;␊ |
| 60 | for (j = 0; j < (height + 2); j++)␊ |
| 61 | {␊ |
| 62 | input = compressBuffer;␊ |
| 63 | if (j < height)␊ |
| 64 | input += j;␊ |
| 65 | else␊ |
| 66 | input += height - 1;␊ |
| 67 | input = (uint32_t *)(input[3] + ((uint8_t *)compressBuffer));␊ |
| 68 | ␊ |
| 69 | uint32_t data = 0, repeat = 0, fetch = 0, count = 0;␊ |
| 70 | sr0 = sr1 = sr2 = sr3 = 0;␊ |
| 71 | ␊ |
| 72 | for (i = 0; i < (width + 2); i++)␊ |
| 73 | {␊ |
| 74 | if (i < width)␊ |
| 75 | {␊ |
| 76 | if (!count)␊ |
| 77 | {␊ |
| 78 | count = *input++;␊ |
| 79 | repeat = (count & 0xff000000);␊ |
| 80 | count ^= repeat;␊ |
| 81 | fetch = true;␊ |
| 82 | }␊ |
| 83 | else␊ |
| 84 | fetch = (0 == repeat);␊ |
| 85 | ␊ |
| 86 | count--;␊ |
| 87 | ␊ |
| 88 | if (fetch)␊ |
| 89 | {␊ |
| 90 | ␉␉␉␉␉data = *((uint16_t *)input);␊ |
| 91 | (*((uint16_t *)input))++;␊ |
| 92 | ␊ |
| 93 | // grayscale␊ |
| 94 | // srgb 13933, 46871, 4732␊ |
| 95 | // ntsc 19595, 38470, 7471␊ |
| 96 | data = 13933 * (0x1f & (data >> 10))␊ |
| 97 | + 46871 * (0x1f & (data >> 5))␊ |
| 98 | + 4732 * (0x1f & data);␊ |
| 99 | data >>= 13;␊ |
| 100 | ␊ |
| 101 | // 70% white, 30 % black␊ |
| 102 | data *= 19661;␊ |
| 103 | data += (103 << 16);␊ |
| 104 | data >>= 16;␊ |
| 105 | }␊ |
| 106 | }␊ |
| 107 | ␊ |
| 108 | // gauss blur␊ |
| 109 | tmp2 = sr0 + data;␊ |
| 110 | sr0 = data;␊ |
| 111 | tmp1 = sr1 + tmp2;␊ |
| 112 | sr1 = tmp2;␊ |
| 113 | tmp2 = sr2 + tmp1;␊ |
| 114 | sr2 = tmp1;␊ |
| 115 | tmp1 = sr3 + tmp2;␊ |
| 116 | sr3 = tmp2;␊ |
| 117 | ␊ |
| 118 | tmp2 = sc0[i] + tmp1;␊ |
| 119 | sc0[i] = tmp1;␊ |
| 120 | tmp1 = sc1[i] + tmp2;␊ |
| 121 | sc1[i] = tmp2;␊ |
| 122 | tmp2 = sc2[i] + tmp1;␊ |
| 123 | sc2[i] = tmp1;␊ |
| 124 | out = (128 + sc3[i] + tmp2) >> 11;␊ |
| 125 | sc3[i] = tmp2;␊ |
| 126 | ␊ |
| 127 | out &= 0x1f;␊ |
| 128 | if ((i > 1) && (j > 1))␊ |
| 129 | output[i-2] = out | (out << 5) | (out << 10);␊ |
| 130 | }␊ |
| 131 | ␊ |
| 132 | if (j > 1)␊ |
| 133 | output += row;␊ |
| 134 | }␊ |
| 135 | free(sc3);␊ |
| 136 | free(sc2);␊ |
| 137 | free(sc1);␊ |
| 138 | free(sc0);␊ |
| 139 | }␊ |
| 140 | ␊ |
| 141 | static void ␊ |
| 142 | PreviewDecompress32(uint32_t * compressBuffer, ␊ |
| 143 | uint32_t width, uint32_t height, uint32_t row, ␊ |
| 144 | uint32_t * output)␊ |
| 145 | {␊ |
| 146 | int i, j;␊ |
| 147 | uint32_t * input;␊ |
| 148 | ␊ |
| 149 | uint16_t * sc0 = malloc((width+2) * sizeof(uint16_t));␊ |
| 150 | uint16_t * sc1 = malloc((width+2) * sizeof(uint16_t));␊ |
| 151 | uint16_t * sc2 = malloc((width+2) * sizeof(uint16_t));␊ |
| 152 | uint16_t * sc3 = malloc((width+2) * sizeof(uint16_t));␊ |
| 153 | ␉␊ |
| 154 | ␉if (!sc0 || !sc1 || !sc2 || !sc3) return;␊ |
| 155 | ␊ |
| 156 | ␉␊ |
| 157 | uint32_t sr0, sr1, sr2, sr3;␊ |
| 158 | ␊ |
| 159 | bzero(sc0, (width+2) * sizeof(uint16_t));␊ |
| 160 | bzero(sc1, (width+2) * sizeof(uint16_t));␊ |
| 161 | bzero(sc2, (width+2) * sizeof(uint16_t));␊ |
| 162 | bzero(sc3, (width+2) * sizeof(uint16_t));␊ |
| 163 | ␊ |
| 164 | uint32_t tmp1, tmp2, out;␊ |
| 165 | for (j = 0; j < (height + 2); j++)␊ |
| 166 | {␊ |
| 167 | input = compressBuffer;␊ |
| 168 | if (j < height)␊ |
| 169 | input += j;␊ |
| 170 | else␊ |
| 171 | input += height - 1;␊ |
| 172 | input = (uint32_t *)(input[3] + ((uint8_t *)compressBuffer));␊ |
| 173 | ␊ |
| 174 | uint32_t data = 0, repeat = 0, fetch = 0, count = 0;␊ |
| 175 | sr0 = sr1 = sr2 = sr3 = 0;␊ |
| 176 | ␊ |
| 177 | for (i = 0; i < (width + 2); i++)␊ |
| 178 | {␊ |
| 179 | if (i < width)␊ |
| 180 | {␊ |
| 181 | if (!count)␊ |
| 182 | {␊ |
| 183 | count = *input++;␊ |
| 184 | repeat = (count & 0xff000000);␊ |
| 185 | count ^= repeat;␊ |
| 186 | fetch = true;␊ |
| 187 | }␊ |
| 188 | else␊ |
| 189 | fetch = (0 == repeat);␊ |
| 190 | ␊ |
| 191 | count--;␊ |
| 192 | ␊ |
| 193 | if (fetch)␊ |
| 194 | {␊ |
| 195 | data = *input++;␊ |
| 196 | ␊ |
| 197 | // grayscale␊ |
| 198 | // srgb 13933, 46871, 4732␊ |
| 199 | // ntsc 19595, 38470, 7471␊ |
| 200 | data = 13933 * (0xff & (data >> 24))␊ |
| 201 | + 46871 * (0xff & (data >> 16))␊ |
| 202 | + 4732 * (0xff & data);␊ |
| 203 | data >>= 16;␊ |
| 204 | ␊ |
| 205 | // 70% white, 30 % black␊ |
| 206 | data *= 19661;␊ |
| 207 | data += (103 << 16);␊ |
| 208 | data >>= 16;␊ |
| 209 | }␊ |
| 210 | }␊ |
| 211 | ␊ |
| 212 | // gauss blur␊ |
| 213 | tmp2 = sr0 + data;␊ |
| 214 | sr0 = data;␊ |
| 215 | tmp1 = sr1 + tmp2;␊ |
| 216 | sr1 = tmp2;␊ |
| 217 | tmp2 = sr2 + tmp1;␊ |
| 218 | sr2 = tmp1;␊ |
| 219 | tmp1 = sr3 + tmp2;␊ |
| 220 | sr3 = tmp2;␊ |
| 221 | ␊ |
| 222 | tmp2 = sc0[i] + tmp1;␊ |
| 223 | sc0[i] = tmp1;␊ |
| 224 | tmp1 = sc1[i] + tmp2;␊ |
| 225 | sc1[i] = tmp2;␊ |
| 226 | tmp2 = sc2[i] + tmp1;␊ |
| 227 | sc2[i] = tmp1;␊ |
| 228 | out = (128 + sc3[i] + tmp2) >> 8;␊ |
| 229 | sc3[i] = tmp2;␊ |
| 230 | ␊ |
| 231 | out &= 0xff;␊ |
| 232 | if ((i > 1) && (j > 1))␊ |
| 233 | output[i-2] = out | (out << 8) | (out << 16);␊ |
| 234 | }␊ |
| 235 | ␊ |
| 236 | if (j > 1)␊ |
| 237 | output += row;␊ |
| 238 | }␊ |
| 239 | ␊ |
| 240 | free(sc3);␊ |
| 241 | free(sc2);␊ |
| 242 | free(sc1);␊ |
| 243 | free(sc0);␊ |
| 244 | }␊ |
| 245 | ␊ |
| 246 | void *␊ |
| 247 | DecompressData(void *srcbase, int *dw, int *dh, int *bitsPerPixel)␊ |
| 248 | {␊ |
| 249 | uint32_t * src = (uint32_t *) srcbase;␊ |
| 250 | ␉void * ret;␊ |
| 251 | ␊ |
| 252 | *bitsPerPixel = 8 * ((int) src[0]);␊ |
| 253 | ␉*dw = (int) src[1];␊ |
| 254 | ␉*dh = (int) src[2];␊ |
| 255 | ␉␊ |
| 256 | ␉ret = malloc ((*dw * *dh * *bitsPerPixel)/ 8);␊ |
| 257 | ␊ |
| 258 | if (!ret) ␊ |
| 259 | {␊ |
| 260 | return 0;␊ |
| 261 | }␊ |
| 262 | ␊ |
| 263 | switch(*bitsPerPixel)␊ |
| 264 | {␊ |
| 265 | case 32:␊ |
| 266 | PreviewDecompress32((uint32_t *)srcbase, *dw, *dh, *dw, ret);␊ |
| 267 | break;␊ |
| 268 | case 16:␊ |
| 269 | PreviewDecompress16((uint32_t *)srcbase, *dw, *dh, *dw, ret);␊ |
| 270 | break;␊ |
| 271 | default:␊ |
| 272 | {␊ |
| 273 | free(ret);␊ |
| 274 | ret = 0; ␊ |
| 275 | break;␊ |
| 276 | }␊ |
| 277 | ␊ |
| 278 | }␊ |
| 279 | return ret;␊ |
| 280 | }␊ |
| 281 | |
