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Root/tags/2.0/i386/boot2/bmdecompress.c

Source at commit 1808 created 12 years 4 months ago.
By blackosx, Revise layout of package installer 'Welcome' file so it looks cleaner. Change the copyright notice to begin from 2009 as seen in the Chameleon 2.0 r431 installer. Should this date be set earlier?
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␊
23#include "libsa.h"␊
24␊
25static void ␊
26PreviewDecompress16(uint32_t * compressBuffer, ␊
27 uint32_t width, uint32_t height, uint32_t row, ␊
28 uint16_t * output)␊
29{␊
30 int i, j;␊
31 uint32_t * input;␊
32 ␊
33 uint16_t * sc0 = malloc((width+2) * sizeof(uint16_t));␊
34 uint16_t * sc1 = malloc((width+2) * sizeof(uint16_t));␊
35 uint16_t * sc2 = malloc((width+2) * sizeof(uint16_t));␊
36 uint16_t * sc3 = malloc((width+2) * sizeof(uint16_t));␊
37 uint32_t sr0, sr1, sr2, sr3;␊
38␊
39 bzero(sc0, (width+2) * sizeof(uint16_t));␊
40 bzero(sc1, (width+2) * sizeof(uint16_t));␊
41 bzero(sc2, (width+2) * sizeof(uint16_t));␊
42 bzero(sc3, (width+2) * sizeof(uint16_t));␊
43␊
44 uint32_t tmp1, tmp2, out;␊
45 for (j = 0; j < (height + 2); j++)␊
46 {␊
47 input = compressBuffer;␊
48 if (j < height)␊
49 input += j;␊
50 else␊
51 input += height - 1;␊
52 input = (uint32_t *)(input[3] + ((uint8_t *)compressBuffer));␊
53␊
54 uint32_t data = 0, repeat = 0, fetch = 0, count = 0;␊
55 sr0 = sr1 = sr2 = sr3 = 0;␊
56␊
57 for (i = 0; i < (width + 2); i++)␊
58 {␊
59 if (i < width)␊
60 {␊
61 if (!count)␊
62 {␊
63 count = *input++;␊
64 repeat = (count & 0xff000000);␊
65 count ^= repeat;␊
66 fetch = true;␊
67 }␊
68 else␊
69 fetch = (0 == repeat);␊
70 ␊
71 count--;␊
72 ␊
73 if (fetch)␊
74 {␊
75␉␉␉␉␉data = *((uint16_t *)input);␊
76 (*((uint16_t *)input))++;␊
77 ␊
78 // grayscale␊
79 // srgb 13933, 46871, 4732␊
80 // ntsc 19595, 38470, 7471␊
81 data = 13933 * (0x1f & (data >> 10))␊
82 + 46871 * (0x1f & (data >> 5))␊
83 + 4732 * (0x1f & data);␊
84 data >>= 13;␊
85 ␊
86 // 70% white, 30 % black␊
87 data *= 19661;␊
88 data += (103 << 16);␊
89 data >>= 16;␊
90 }␊
91 }␊
92␊
93 // gauss blur␊
94 tmp2 = sr0 + data;␊
95 sr0 = data;␊
96 tmp1 = sr1 + tmp2;␊
97 sr1 = tmp2;␊
98 tmp2 = sr2 + tmp1;␊
99 sr2 = tmp1;␊
100 tmp1 = sr3 + tmp2;␊
101 sr3 = tmp2;␊
102 ␊
103 tmp2 = sc0[i] + tmp1;␊
104 sc0[i] = tmp1;␊
105 tmp1 = sc1[i] + tmp2;␊
106 sc1[i] = tmp2;␊
107 tmp2 = sc2[i] + tmp1;␊
108 sc2[i] = tmp1;␊
109 out = (128 + sc3[i] + tmp2) >> 11;␊
110 sc3[i] = tmp2;␊
111␊
112 out &= 0x1f;␊
113 if ((i > 1) && (j > 1))␊
114 output[i-2] = out | (out << 5) | (out << 10);␊
115 }␊
116␊
117 if (j > 1)␊
118 output += row;␊
119 }␊
120 free(sc3);␊
121 free(sc2);␊
122 free(sc1);␊
123 free(sc0);␊
124}␊
125␊
126static void ␊
127PreviewDecompress32(uint32_t * compressBuffer, ␊
128 uint32_t width, uint32_t height, uint32_t row, ␊
129 uint32_t * output)␊
130{␊
131 int i, j;␊
132 uint32_t * input;␊
133 ␊
134 uint16_t * sc0 = malloc((width+2) * sizeof(uint16_t));␊
135 uint16_t * sc1 = malloc((width+2) * sizeof(uint16_t));␊
136 uint16_t * sc2 = malloc((width+2) * sizeof(uint16_t));␊
137 uint16_t * sc3 = malloc((width+2) * sizeof(uint16_t));␊
138 uint32_t sr0, sr1, sr2, sr3;␊
139␊
140 bzero(sc0, (width+2) * sizeof(uint16_t));␊
141 bzero(sc1, (width+2) * sizeof(uint16_t));␊
142 bzero(sc2, (width+2) * sizeof(uint16_t));␊
143 bzero(sc3, (width+2) * sizeof(uint16_t));␊
144␊
145 uint32_t tmp1, tmp2, out;␊
146 for (j = 0; j < (height + 2); j++)␊
147 {␊
148 input = compressBuffer;␊
149 if (j < height)␊
150 input += j;␊
151 else␊
152 input += height - 1;␊
153 input = (uint32_t *)(input[3] + ((uint8_t *)compressBuffer));␊
154␊
155 uint32_t data = 0, repeat = 0, fetch = 0, count = 0;␊
156 sr0 = sr1 = sr2 = sr3 = 0;␊
157␊
158 for (i = 0; i < (width + 2); i++)␊
159 {␊
160 if (i < width)␊
161 {␊
162 if (!count)␊
163 {␊
164 count = *input++;␊
165 repeat = (count & 0xff000000);␊
166 count ^= repeat;␊
167 fetch = true;␊
168 }␊
169 else␊
170 fetch = (0 == repeat);␊
171 ␊
172 count--;␊
173 ␊
174 if (fetch)␊
175 {␊
176 data = *input++;␊
177 ␊
178 // grayscale␊
179 // srgb 13933, 46871, 4732␊
180 // ntsc 19595, 38470, 7471␊
181 data = 13933 * (0xff & (data >> 24))␊
182 + 46871 * (0xff & (data >> 16))␊
183 + 4732 * (0xff & data);␊
184 data >>= 16;␊
185 ␊
186 // 70% white, 30 % black␊
187 data *= 19661;␊
188 data += (103 << 16);␊
189 data >>= 16;␊
190 }␊
191 }␊
192␊
193 // gauss blur␊
194 tmp2 = sr0 + data;␊
195 sr0 = data;␊
196 tmp1 = sr1 + tmp2;␊
197 sr1 = tmp2;␊
198 tmp2 = sr2 + tmp1;␊
199 sr2 = tmp1;␊
200 tmp1 = sr3 + tmp2;␊
201 sr3 = tmp2;␊
202 ␊
203 tmp2 = sc0[i] + tmp1;␊
204 sc0[i] = tmp1;␊
205 tmp1 = sc1[i] + tmp2;␊
206 sc1[i] = tmp2;␊
207 tmp2 = sc2[i] + tmp1;␊
208 sc2[i] = tmp1;␊
209 out = (128 + sc3[i] + tmp2) >> 8;␊
210 sc3[i] = tmp2;␊
211␊
212 out &= 0xff;␊
213 if ((i > 1) && (j > 1))␊
214 output[i-2] = out | (out << 8) | (out << 16);␊
215 }␊
216␊
217 if (j > 1)␊
218 output += row;␊
219 }␊
220␊
221 free(sc3);␊
222 free(sc2);␊
223 free(sc1);␊
224 free(sc0);␊
225}␊
226␊
227void *␊
228DecompressData(void *srcbase, int *dw, int *dh, int *bitsPerPixel)␊
229{␊
230 uint32_t * src = (uint32_t *) srcbase;␊
231␉void * ret;␊
232␊
233 *bitsPerPixel = 8 * ((int) src[0]);␊
234␉*dw = (int) src[1];␊
235␉*dh = (int) src[2];␊
236␉␊
237␉ret = malloc ((*dw * *dh * *bitsPerPixel)/ 8);␊
238␊
239 switch(*bitsPerPixel)␊
240 {␊
241 case 32:␊
242 PreviewDecompress32((uint32_t *)srcbase, *dw, *dh, *dw, ret);␊
243 return ret;␊
244 case 16:␊
245 PreviewDecompress16((uint32_t *)srcbase, *dw, *dh, *dw, ret);␊
246 return ret;␊
247 default:␊
248 return 0;␊
249 }␊
250}␊
251

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Revision: 1808