1 | ␍␊ |
2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers)␍␊ |
3 | *␍␊ |
4 | * Last changed in libpng 1.5.11 [June 14, 2012]␍␊ |
5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson␍␊ |
6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)␍␊ |
7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)␍␊ |
8 | *␍␊ |
9 | * This code is released under the libpng license.␍␊ |
10 | * For conditions of distribution and use, see the disclaimer␍␊ |
11 | * and license in png.h␍␊ |
12 | */␍␊ |
13 | ␍␊ |
14 | #include "pngpriv.h"␍␊ |
15 | ␍␊ |
16 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)␍␊ |
17 | ␍␊ |
18 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)␍␊ |
19 | /* Turn on BGR-to-RGB mapping */␍␊ |
20 | void PNGAPI␍␊ |
21 | png_set_bgr(png_structp png_ptr)␍␊ |
22 | {␍␊ |
23 | png_debug(1, "in png_set_bgr");␍␊ |
24 | ␍␊ |
25 | if (png_ptr == NULL)␍␊ |
26 | return;␍␊ |
27 | ␍␊ |
28 | png_ptr->transformations |= PNG_BGR;␍␊ |
29 | }␍␊ |
30 | #endif␍␊ |
31 | ␍␊ |
32 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)␍␊ |
33 | /* Turn on 16 bit byte swapping */␍␊ |
34 | void PNGAPI␍␊ |
35 | png_set_swap(png_structp png_ptr)␍␊ |
36 | {␍␊ |
37 | png_debug(1, "in png_set_swap");␍␊ |
38 | ␍␊ |
39 | if (png_ptr == NULL)␍␊ |
40 | return;␍␊ |
41 | ␍␊ |
42 | if (png_ptr->bit_depth == 16)␍␊ |
43 | png_ptr->transformations |= PNG_SWAP_BYTES;␍␊ |
44 | }␍␊ |
45 | #endif␍␊ |
46 | ␍␊ |
47 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)␍␊ |
48 | /* Turn on pixel packing */␍␊ |
49 | void PNGAPI␍␊ |
50 | png_set_packing(png_structp png_ptr)␍␊ |
51 | {␍␊ |
52 | png_debug(1, "in png_set_packing");␍␊ |
53 | ␍␊ |
54 | if (png_ptr == NULL)␍␊ |
55 | return;␍␊ |
56 | ␍␊ |
57 | if (png_ptr->bit_depth < 8)␍␊ |
58 | {␍␊ |
59 | png_ptr->transformations |= PNG_PACK;␍␊ |
60 | png_ptr->usr_bit_depth = 8;␍␊ |
61 | }␍␊ |
62 | }␍␊ |
63 | #endif␍␊ |
64 | ␍␊ |
65 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)␍␊ |
66 | /* Turn on packed pixel swapping */␍␊ |
67 | void PNGAPI␍␊ |
68 | png_set_packswap(png_structp png_ptr)␍␊ |
69 | {␍␊ |
70 | png_debug(1, "in png_set_packswap");␍␊ |
71 | ␍␊ |
72 | if (png_ptr == NULL)␍␊ |
73 | return;␍␊ |
74 | ␍␊ |
75 | if (png_ptr->bit_depth < 8)␍␊ |
76 | png_ptr->transformations |= PNG_PACKSWAP;␍␊ |
77 | }␍␊ |
78 | #endif␍␊ |
79 | ␍␊ |
80 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)␍␊ |
81 | void PNGAPI␍␊ |
82 | png_set_shift(png_structp png_ptr, png_const_color_8p true_bits)␍␊ |
83 | {␍␊ |
84 | png_debug(1, "in png_set_shift");␍␊ |
85 | ␍␊ |
86 | if (png_ptr == NULL)␍␊ |
87 | return;␍␊ |
88 | ␍␊ |
89 | png_ptr->transformations |= PNG_SHIFT;␍␊ |
90 | png_ptr->shift = *true_bits;␍␊ |
91 | }␍␊ |
92 | #endif␍␊ |
93 | ␍␊ |
94 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \␍␊ |
95 | defined(PNG_WRITE_INTERLACING_SUPPORTED)␍␊ |
96 | int PNGAPI␍␊ |
97 | png_set_interlace_handling(png_structp png_ptr)␍␊ |
98 | {␍␊ |
99 | png_debug(1, "in png_set_interlace handling");␍␊ |
100 | ␍␊ |
101 | if (png_ptr && png_ptr->interlaced)␍␊ |
102 | {␍␊ |
103 | png_ptr->transformations |= PNG_INTERLACE;␍␊ |
104 | return (7);␍␊ |
105 | }␍␊ |
106 | ␍␊ |
107 | return (1);␍␊ |
108 | }␍␊ |
109 | #endif␍␊ |
110 | ␍␊ |
111 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)␍␊ |
112 | /* Add a filler byte on read, or remove a filler or alpha byte on write.␍␊ |
113 | * The filler type has changed in v0.95 to allow future 2-byte fillers␍␊ |
114 | * for 48-bit input data, as well as to avoid problems with some compilers␍␊ |
115 | * that don't like bytes as parameters.␍␊ |
116 | */␍␊ |
117 | void PNGAPI␍␊ |
118 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)␍␊ |
119 | {␍␊ |
120 | png_debug(1, "in png_set_filler");␍␊ |
121 | ␍␊ |
122 | if (png_ptr == NULL)␍␊ |
123 | return;␍␊ |
124 | ␍␊ |
125 | png_ptr->transformations |= PNG_FILLER;␍␊ |
126 | png_ptr->filler = (png_uint_16)filler;␍␊ |
127 | ␍␊ |
128 | if (filler_loc == PNG_FILLER_AFTER)␍␊ |
129 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER;␍␊ |
130 | ␍␊ |
131 | else␍␊ |
132 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;␍␊ |
133 | ␍␊ |
134 | /* This should probably go in the "do_read_filler" routine.␍␊ |
135 | * I attempted to do that in libpng-1.0.1a but that caused problems␍␊ |
136 | * so I restored it in libpng-1.0.2a␍␊ |
137 | */␍␊ |
138 | ␍␊ |
139 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
140 | {␍␊ |
141 | png_ptr->usr_channels = 4;␍␊ |
142 | }␍␊ |
143 | ␍␊ |
144 | /* Also I added this in libpng-1.0.2a (what happens when we expand␍␊ |
145 | * a less-than-8-bit grayscale to GA?) */␍␊ |
146 | ␍␊ |
147 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)␍␊ |
148 | {␍␊ |
149 | png_ptr->usr_channels = 2;␍␊ |
150 | }␍␊ |
151 | }␍␊ |
152 | ␍␊ |
153 | /* Added to libpng-1.2.7 */␍␊ |
154 | void PNGAPI␍␊ |
155 | png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)␍␊ |
156 | {␍␊ |
157 | png_debug(1, "in png_set_add_alpha");␍␊ |
158 | ␍␊ |
159 | if (png_ptr == NULL)␍␊ |
160 | return;␍␊ |
161 | ␍␊ |
162 | png_set_filler(png_ptr, filler, filler_loc);␍␊ |
163 | png_ptr->transformations |= PNG_ADD_ALPHA;␍␊ |
164 | }␍␊ |
165 | ␍␊ |
166 | #endif␍␊ |
167 | ␍␊ |
168 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \␍␊ |
169 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)␍␊ |
170 | void PNGAPI␍␊ |
171 | png_set_swap_alpha(png_structp png_ptr)␍␊ |
172 | {␍␊ |
173 | png_debug(1, "in png_set_swap_alpha");␍␊ |
174 | ␍␊ |
175 | if (png_ptr == NULL)␍␊ |
176 | return;␍␊ |
177 | ␍␊ |
178 | png_ptr->transformations |= PNG_SWAP_ALPHA;␍␊ |
179 | }␍␊ |
180 | #endif␍␊ |
181 | ␍␊ |
182 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \␍␊ |
183 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)␍␊ |
184 | void PNGAPI␍␊ |
185 | png_set_invert_alpha(png_structp png_ptr)␍␊ |
186 | {␍␊ |
187 | png_debug(1, "in png_set_invert_alpha");␍␊ |
188 | ␍␊ |
189 | if (png_ptr == NULL)␍␊ |
190 | return;␍␊ |
191 | ␍␊ |
192 | png_ptr->transformations |= PNG_INVERT_ALPHA;␍␊ |
193 | }␍␊ |
194 | #endif␍␊ |
195 | ␍␊ |
196 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)␍␊ |
197 | void PNGAPI␍␊ |
198 | png_set_invert_mono(png_structp png_ptr)␍␊ |
199 | {␍␊ |
200 | png_debug(1, "in png_set_invert_mono");␍␊ |
201 | ␍␊ |
202 | if (png_ptr == NULL)␍␊ |
203 | return;␍␊ |
204 | ␍␊ |
205 | png_ptr->transformations |= PNG_INVERT_MONO;␍␊ |
206 | }␍␊ |
207 | ␍␊ |
208 | /* Invert monochrome grayscale data */␍␊ |
209 | void /* PRIVATE */␍␊ |
210 | png_do_invert(png_row_infop row_info, png_bytep row)␍␊ |
211 | {␍␊ |
212 | png_debug(1, "in png_do_invert");␍␊ |
213 | ␍␊ |
214 | /* This test removed from libpng version 1.0.13 and 1.2.0:␍␊ |
215 | * if (row_info->bit_depth == 1 &&␍␊ |
216 | */␍␊ |
217 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY)␍␊ |
218 | {␍␊ |
219 | png_bytep rp = row;␍␊ |
220 | png_size_t i;␍␊ |
221 | png_size_t istop = row_info->rowbytes;␍␊ |
222 | ␍␊ |
223 | for (i = 0; i < istop; i++)␍␊ |
224 | {␍␊ |
225 | *rp = (png_byte)(~(*rp));␍␊ |
226 | rp++;␍␊ |
227 | }␍␊ |
228 | }␍␊ |
229 | ␍␊ |
230 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&␍␊ |
231 | row_info->bit_depth == 8)␍␊ |
232 | {␍␊ |
233 | png_bytep rp = row;␍␊ |
234 | png_size_t i;␍␊ |
235 | png_size_t istop = row_info->rowbytes;␍␊ |
236 | ␍␊ |
237 | for (i = 0; i < istop; i += 2)␍␊ |
238 | {␍␊ |
239 | *rp = (png_byte)(~(*rp));␍␊ |
240 | rp += 2;␍␊ |
241 | }␍␊ |
242 | }␍␊ |
243 | ␍␊ |
244 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
245 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&␍␊ |
246 | row_info->bit_depth == 16)␍␊ |
247 | {␍␊ |
248 | png_bytep rp = row;␍␊ |
249 | png_size_t i;␍␊ |
250 | png_size_t istop = row_info->rowbytes;␍␊ |
251 | ␍␊ |
252 | for (i = 0; i < istop; i += 4)␍␊ |
253 | {␍␊ |
254 | *rp = (png_byte)(~(*rp));␍␊ |
255 | *(rp + 1) = (png_byte)(~(*(rp + 1)));␍␊ |
256 | rp += 4;␍␊ |
257 | }␍␊ |
258 | }␍␊ |
259 | #endif␍␊ |
260 | }␍␊ |
261 | #endif␍␊ |
262 | ␍␊ |
263 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
264 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)␍␊ |
265 | /* Swaps byte order on 16 bit depth images */␍␊ |
266 | void /* PRIVATE */␍␊ |
267 | png_do_swap(png_row_infop row_info, png_bytep row)␍␊ |
268 | {␍␊ |
269 | png_debug(1, "in png_do_swap");␍␊ |
270 | ␍␊ |
271 | if (row_info->bit_depth == 16)␍␊ |
272 | {␍␊ |
273 | png_bytep rp = row;␍␊ |
274 | png_uint_32 i;␍␊ |
275 | png_uint_32 istop= row_info->width * row_info->channels;␍␊ |
276 | ␍␊ |
277 | for (i = 0; i < istop; i++, rp += 2)␍␊ |
278 | {␍␊ |
279 | png_byte t = *rp;␍␊ |
280 | *rp = *(rp + 1);␍␊ |
281 | *(rp + 1) = t;␍␊ |
282 | }␍␊ |
283 | }␍␊ |
284 | }␍␊ |
285 | #endif␍␊ |
286 | #endif␍␊ |
287 | ␍␊ |
288 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)␍␊ |
289 | static PNG_CONST png_byte onebppswaptable[256] = {␍␊ |
290 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,␍␊ |
291 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,␍␊ |
292 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,␍␊ |
293 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,␍␊ |
294 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,␍␊ |
295 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,␍␊ |
296 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,␍␊ |
297 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,␍␊ |
298 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,␍␊ |
299 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,␍␊ |
300 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,␍␊ |
301 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,␍␊ |
302 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,␍␊ |
303 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,␍␊ |
304 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,␍␊ |
305 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,␍␊ |
306 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,␍␊ |
307 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,␍␊ |
308 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,␍␊ |
309 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,␍␊ |
310 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,␍␊ |
311 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,␍␊ |
312 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,␍␊ |
313 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,␍␊ |
314 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,␍␊ |
315 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,␍␊ |
316 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,␍␊ |
317 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,␍␊ |
318 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,␍␊ |
319 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,␍␊ |
320 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,␍␊ |
321 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF␍␊ |
322 | };␍␊ |
323 | ␍␊ |
324 | static PNG_CONST png_byte twobppswaptable[256] = {␍␊ |
325 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,␍␊ |
326 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,␍␊ |
327 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,␍␊ |
328 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,␍␊ |
329 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,␍␊ |
330 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,␍␊ |
331 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,␍␊ |
332 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,␍␊ |
333 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,␍␊ |
334 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,␍␊ |
335 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,␍␊ |
336 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,␍␊ |
337 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,␍␊ |
338 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,␍␊ |
339 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,␍␊ |
340 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,␍␊ |
341 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,␍␊ |
342 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,␍␊ |
343 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,␍␊ |
344 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,␍␊ |
345 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,␍␊ |
346 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,␍␊ |
347 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,␍␊ |
348 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,␍␊ |
349 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,␍␊ |
350 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,␍␊ |
351 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,␍␊ |
352 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,␍␊ |
353 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,␍␊ |
354 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,␍␊ |
355 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,␍␊ |
356 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF␍␊ |
357 | };␍␊ |
358 | ␍␊ |
359 | static PNG_CONST png_byte fourbppswaptable[256] = {␍␊ |
360 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,␍␊ |
361 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,␍␊ |
362 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,␍␊ |
363 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,␍␊ |
364 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,␍␊ |
365 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,␍␊ |
366 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,␍␊ |
367 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,␍␊ |
368 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,␍␊ |
369 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,␍␊ |
370 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,␍␊ |
371 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,␍␊ |
372 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,␍␊ |
373 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,␍␊ |
374 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,␍␊ |
375 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,␍␊ |
376 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,␍␊ |
377 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,␍␊ |
378 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,␍␊ |
379 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,␍␊ |
380 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,␍␊ |
381 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,␍␊ |
382 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,␍␊ |
383 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,␍␊ |
384 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,␍␊ |
385 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,␍␊ |
386 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,␍␊ |
387 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,␍␊ |
388 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,␍␊ |
389 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,␍␊ |
390 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,␍␊ |
391 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF␍␊ |
392 | };␍␊ |
393 | ␍␊ |
394 | /* Swaps pixel packing order within bytes */␍␊ |
395 | void /* PRIVATE */␍␊ |
396 | png_do_packswap(png_row_infop row_info, png_bytep row)␍␊ |
397 | {␍␊ |
398 | png_debug(1, "in png_do_packswap");␍␊ |
399 | ␍␊ |
400 | if (row_info->bit_depth < 8)␍␊ |
401 | {␍␊ |
402 | png_bytep rp;␍␊ |
403 | png_const_bytep end, table;␍␊ |
404 | ␍␊ |
405 | end = row + row_info->rowbytes;␍␊ |
406 | ␍␊ |
407 | if (row_info->bit_depth == 1)␍␊ |
408 | table = onebppswaptable;␍␊ |
409 | ␍␊ |
410 | else if (row_info->bit_depth == 2)␍␊ |
411 | table = twobppswaptable;␍␊ |
412 | ␍␊ |
413 | else if (row_info->bit_depth == 4)␍␊ |
414 | table = fourbppswaptable;␍␊ |
415 | ␍␊ |
416 | else␍␊ |
417 | return;␍␊ |
418 | ␍␊ |
419 | for (rp = row; rp < end; rp++)␍␊ |
420 | *rp = table[*rp];␍␊ |
421 | }␍␊ |
422 | }␍␊ |
423 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */␍␊ |
424 | ␍␊ |
425 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \␍␊ |
426 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED)␍␊ |
427 | /* Remove a channel - this used to be 'png_do_strip_filler' but it used a␍␊ |
428 | * somewhat weird combination of flags to determine what to do. All the calls␍␊ |
429 | * to png_do_strip_filler are changed in 1.5.2 to call this instead with the␍␊ |
430 | * correct arguments.␍␊ |
431 | *␍␊ |
432 | * The routine isn't general - the channel must be the channel at the start or␍␊ |
433 | * end (not in the middle) of each pixel.␍␊ |
434 | */␍␊ |
435 | void /* PRIVATE */␍␊ |
436 | png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)␍␊ |
437 | {␍␊ |
438 | png_bytep sp = row; /* source pointer */␍␊ |
439 | png_bytep dp = row; /* destination pointer */␍␊ |
440 | png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */␍␊ |
441 | ␍␊ |
442 | /* At the start sp will point to the first byte to copy and dp to where␍␊ |
443 | * it is copied to. ep always points just beyond the end of the row, so␍␊ |
444 | * the loop simply copies (channels-1) channels until sp reaches ep.␍␊ |
445 | *␍␊ |
446 | * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.␍␊ |
447 | * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.␍␊ |
448 | */␍␊ |
449 | ␍␊ |
450 | /* GA, GX, XG cases */␍␊ |
451 | if (row_info->channels == 2)␍␊ |
452 | {␍␊ |
453 | if (row_info->bit_depth == 8)␍␊ |
454 | {␍␊ |
455 | if (at_start) /* Skip initial filler */␍␊ |
456 | ++sp;␍␊ |
457 | else /* Skip initial channel and, for sp, the filler */␍␊ |
458 | sp += 2, ++dp;␍␊ |
459 | ␍␊ |
460 | /* For a 1 pixel wide image there is nothing to do */␍␊ |
461 | while (sp < ep)␍␊ |
462 | *dp++ = *sp, sp += 2;␍␊ |
463 | ␍␊ |
464 | row_info->pixel_depth = 8;␍␊ |
465 | }␍␊ |
466 | ␍␊ |
467 | else if (row_info->bit_depth == 16)␍␊ |
468 | {␍␊ |
469 | if (at_start) /* Skip initial filler */␍␊ |
470 | sp += 2;␍␊ |
471 | else /* Skip initial channel and, for sp, the filler */␍␊ |
472 | sp += 4, dp += 2;␍␊ |
473 | ␍␊ |
474 | while (sp < ep)␍␊ |
475 | *dp++ = *sp++, *dp++ = *sp, sp += 3;␍␊ |
476 | ␍␊ |
477 | row_info->pixel_depth = 16;␍␊ |
478 | }␍␊ |
479 | ␍␊ |
480 | else␍␊ |
481 | return; /* bad bit depth */␍␊ |
482 | ␍␊ |
483 | row_info->channels = 1;␍␊ |
484 | ␍␊ |
485 | /* Finally fix the color type if it records an alpha channel */␍␊ |
486 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)␍␊ |
487 | row_info->color_type = PNG_COLOR_TYPE_GRAY;␍␊ |
488 | }␍␊ |
489 | ␍␊ |
490 | /* RGBA, RGBX, XRGB cases */␍␊ |
491 | else if (row_info->channels == 4)␍␊ |
492 | {␍␊ |
493 | if (row_info->bit_depth == 8)␍␊ |
494 | {␍␊ |
495 | if (at_start) /* Skip initial filler */␍␊ |
496 | ++sp;␍␊ |
497 | else /* Skip initial channels and, for sp, the filler */␍␊ |
498 | sp += 4, dp += 3;␍␊ |
499 | ␍␊ |
500 | /* Note that the loop adds 3 to dp and 4 to sp each time. */␍␊ |
501 | while (sp < ep)␍␊ |
502 | *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;␍␊ |
503 | ␍␊ |
504 | row_info->pixel_depth = 24;␍␊ |
505 | }␍␊ |
506 | ␍␊ |
507 | else if (row_info->bit_depth == 16)␍␊ |
508 | {␍␊ |
509 | if (at_start) /* Skip initial filler */␍␊ |
510 | sp += 2;␍␊ |
511 | else /* Skip initial channels and, for sp, the filler */␍␊ |
512 | sp += 8, dp += 6;␍␊ |
513 | ␍␊ |
514 | while (sp < ep)␍␊ |
515 | {␍␊ |
516 | /* Copy 6 bytes, skip 2 */␍␊ |
517 | *dp++ = *sp++, *dp++ = *sp++;␍␊ |
518 | *dp++ = *sp++, *dp++ = *sp++;␍␊ |
519 | *dp++ = *sp++, *dp++ = *sp, sp += 3;␍␊ |
520 | }␍␊ |
521 | ␍␊ |
522 | row_info->pixel_depth = 48;␍␊ |
523 | }␍␊ |
524 | ␍␊ |
525 | else␍␊ |
526 | return; /* bad bit depth */␍␊ |
527 | ␍␊ |
528 | row_info->channels = 3;␍␊ |
529 | ␍␊ |
530 | /* Finally fix the color type if it records an alpha channel */␍␊ |
531 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
532 | row_info->color_type = PNG_COLOR_TYPE_RGB;␍␊ |
533 | }␍␊ |
534 | ␍␊ |
535 | else␍␊ |
536 | return; /* The filler channel has gone already */␍␊ |
537 | ␍␊ |
538 | /* Fix the rowbytes value. */␍␊ |
539 | row_info->rowbytes = dp-row;␍␊ |
540 | }␍␊ |
541 | #endif␍␊ |
542 | ␍␊ |
543 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)␍␊ |
544 | /* Swaps red and blue bytes within a pixel */␍␊ |
545 | void /* PRIVATE */␍␊ |
546 | png_do_bgr(png_row_infop row_info, png_bytep row)␍␊ |
547 | {␍␊ |
548 | png_debug(1, "in png_do_bgr");␍␊ |
549 | ␍␊ |
550 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR))␍␊ |
551 | {␍␊ |
552 | png_uint_32 row_width = row_info->width;␍␊ |
553 | if (row_info->bit_depth == 8)␍␊ |
554 | {␍␊ |
555 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
556 | {␍␊ |
557 | png_bytep rp;␍␊ |
558 | png_uint_32 i;␍␊ |
559 | ␍␊ |
560 | for (i = 0, rp = row; i < row_width; i++, rp += 3)␍␊ |
561 | {␍␊ |
562 | png_byte save = *rp;␍␊ |
563 | *rp = *(rp + 2);␍␊ |
564 | *(rp + 2) = save;␍␊ |
565 | }␍␊ |
566 | }␍␊ |
567 | ␍␊ |
568 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
569 | {␍␊ |
570 | png_bytep rp;␍␊ |
571 | png_uint_32 i;␍␊ |
572 | ␍␊ |
573 | for (i = 0, rp = row; i < row_width; i++, rp += 4)␍␊ |
574 | {␍␊ |
575 | png_byte save = *rp;␍␊ |
576 | *rp = *(rp + 2);␍␊ |
577 | *(rp + 2) = save;␍␊ |
578 | }␍␊ |
579 | }␍␊ |
580 | }␍␊ |
581 | ␍␊ |
582 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
583 | else if (row_info->bit_depth == 16)␍␊ |
584 | {␍␊ |
585 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
586 | {␍␊ |
587 | png_bytep rp;␍␊ |
588 | png_uint_32 i;␍␊ |
589 | ␍␊ |
590 | for (i = 0, rp = row; i < row_width; i++, rp += 6)␍␊ |
591 | {␍␊ |
592 | png_byte save = *rp;␍␊ |
593 | *rp = *(rp + 4);␍␊ |
594 | *(rp + 4) = save;␍␊ |
595 | save = *(rp + 1);␍␊ |
596 | *(rp + 1) = *(rp + 5);␍␊ |
597 | *(rp + 5) = save;␍␊ |
598 | }␍␊ |
599 | }␍␊ |
600 | ␍␊ |
601 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
602 | {␍␊ |
603 | png_bytep rp;␍␊ |
604 | png_uint_32 i;␍␊ |
605 | ␍␊ |
606 | for (i = 0, rp = row; i < row_width; i++, rp += 8)␍␊ |
607 | {␍␊ |
608 | png_byte save = *rp;␍␊ |
609 | *rp = *(rp + 4);␍␊ |
610 | *(rp + 4) = save;␍␊ |
611 | save = *(rp + 1);␍␊ |
612 | *(rp + 1) = *(rp + 5);␍␊ |
613 | *(rp + 5) = save;␍␊ |
614 | }␍␊ |
615 | }␍␊ |
616 | }␍␊ |
617 | #endif␍␊ |
618 | }␍␊ |
619 | }␍␊ |
620 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */␍␊ |
621 | ␍␊ |
622 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \␍␊ |
623 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)␍␊ |
624 | /* Added at libpng-1.5.10 */␍␊ |
625 | void /* PRIVATE */␍␊ |
626 | png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info)␍␊ |
627 | {␍␊ |
628 | if (png_ptr->num_palette < (1 << row_info->bit_depth) &&␍␊ |
629 | png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */␍␊ |
630 | {␍␊ |
631 | /* Calculations moved outside switch in an attempt to stop different␍␊ |
632 | * compiler warnings. 'padding' is in *bits* within the last byte, it is␍␊ |
633 | * an 'int' because pixel_depth becomes an 'int' in the expression below,␍␊ |
634 | * and this calculation is used because it avoids warnings that other␍␊ |
635 | * forms produced on either GCC or MSVC.␍␊ |
636 | */␍␊ |
637 | int padding = (-row_info->pixel_depth * row_info->width) & 7;␍␊ |
638 | png_bytep rp = png_ptr->row_buf + row_info->rowbytes;␍␊ |
639 | ␍␊ |
640 | switch (row_info->bit_depth)␍␊ |
641 | {␍␊ |
642 | case 1:␍␊ |
643 | {␍␊ |
644 | /* in this case, all bytes must be 0 so we don't need␍␊ |
645 | * to unpack the pixels except for the rightmost one.␍␊ |
646 | */␍␊ |
647 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
648 | {␍␊ |
649 | if (*rp >> padding != 0)␍␊ |
650 | png_ptr->num_palette_max = 1;␍␊ |
651 | padding = 0;␍␊ |
652 | }␍␊ |
653 | ␍␊ |
654 | break;␍␊ |
655 | }␍␊ |
656 | ␍␊ |
657 | case 2:␍␊ |
658 | {␍␊ |
659 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
660 | {␍␊ |
661 | int i = ((*rp >> padding) & 0x03);␍␊ |
662 | ␍␊ |
663 | if (i > png_ptr->num_palette_max)␍␊ |
664 | png_ptr->num_palette_max = i;␍␊ |
665 | ␍␊ |
666 | i = (((*rp >> padding) >> 2) & 0x03);␍␊ |
667 | ␍␊ |
668 | if (i > png_ptr->num_palette_max)␍␊ |
669 | png_ptr->num_palette_max = i;␍␊ |
670 | ␍␊ |
671 | i = (((*rp >> padding) >> 4) & 0x03);␍␊ |
672 | ␍␊ |
673 | if (i > png_ptr->num_palette_max)␍␊ |
674 | png_ptr->num_palette_max = i;␍␊ |
675 | ␍␊ |
676 | i = (((*rp >> padding) >> 6) & 0x03);␍␊ |
677 | ␍␊ |
678 | if (i > png_ptr->num_palette_max)␍␊ |
679 | png_ptr->num_palette_max = i;␍␊ |
680 | ␍␊ |
681 | padding = 0;␍␊ |
682 | }␍␊ |
683 | ␍␊ |
684 | break;␍␊ |
685 | }␍␊ |
686 | ␍␊ |
687 | case 4:␍␊ |
688 | {␍␊ |
689 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
690 | {␍␊ |
691 | int i = ((*rp >> padding) & 0x0f);␍␊ |
692 | ␍␊ |
693 | if (i > png_ptr->num_palette_max)␍␊ |
694 | png_ptr->num_palette_max = i;␍␊ |
695 | ␍␊ |
696 | i = (((*rp >> padding) >> 4) & 0x0f);␍␊ |
697 | ␍␊ |
698 | if (i > png_ptr->num_palette_max)␍␊ |
699 | png_ptr->num_palette_max = i;␍␊ |
700 | ␍␊ |
701 | padding = 0;␍␊ |
702 | }␍␊ |
703 | ␍␊ |
704 | break;␍␊ |
705 | }␍␊ |
706 | ␍␊ |
707 | case 8:␍␊ |
708 | {␍␊ |
709 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
710 | {␍␊ |
711 | if (*rp > png_ptr->num_palette_max)␍␊ |
712 | png_ptr->num_palette_max = (int) *rp;␍␊ |
713 | }␍␊ |
714 | ␍␊ |
715 | break;␍␊ |
716 | }␍␊ |
717 | ␍␊ |
718 | default:␍␊ |
719 | break;␍␊ |
720 | }␍␊ |
721 | }␍␊ |
722 | }␍␊ |
723 | #endif /* PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED */␍␊ |
724 | ␍␊ |
725 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \␍␊ |
726 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)␍␊ |
727 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED␍␊ |
728 | void PNGAPI␍␊ |
729 | png_set_user_transform_info(png_structp png_ptr, png_voidp␍␊ |
730 | user_transform_ptr, int user_transform_depth, int user_transform_channels)␍␊ |
731 | {␍␊ |
732 | png_debug(1, "in png_set_user_transform_info");␍␊ |
733 | ␍␊ |
734 | if (png_ptr == NULL)␍␊ |
735 | return;␍␊ |
736 | png_ptr->user_transform_ptr = user_transform_ptr;␍␊ |
737 | png_ptr->user_transform_depth = (png_byte)user_transform_depth;␍␊ |
738 | png_ptr->user_transform_channels = (png_byte)user_transform_channels;␍␊ |
739 | }␍␊ |
740 | #endif␍␊ |
741 | ␍␊ |
742 | /* This function returns a pointer to the user_transform_ptr associated with␍␊ |
743 | * the user transform functions. The application should free any memory␍␊ |
744 | * associated with this pointer before png_write_destroy and png_read_destroy␍␊ |
745 | * are called.␍␊ |
746 | */␍␊ |
747 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED␍␊ |
748 | png_voidp PNGAPI␍␊ |
749 | png_get_user_transform_ptr(png_const_structp png_ptr)␍␊ |
750 | {␍␊ |
751 | if (png_ptr == NULL)␍␊ |
752 | return (NULL);␍␊ |
753 | ␍␊ |
754 | return ((png_voidp)png_ptr->user_transform_ptr);␍␊ |
755 | }␍␊ |
756 | #endif␍␊ |
757 | ␍␊ |
758 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED␍␊ |
759 | png_uint_32 PNGAPI␍␊ |
760 | png_get_current_row_number(png_const_structp png_ptr)␍␊ |
761 | {␍␊ |
762 | /* See the comments in png.h - this is the sub-image row when reading and␍␊ |
763 | * interlaced image.␍␊ |
764 | */␍␊ |
765 | if (png_ptr != NULL)␍␊ |
766 | return png_ptr->row_number;␍␊ |
767 | ␍␊ |
768 | return PNG_UINT_32_MAX; /* help the app not to fail silently */␍␊ |
769 | }␍␊ |
770 | ␍␊ |
771 | png_byte PNGAPI␍␊ |
772 | png_get_current_pass_number(png_const_structp png_ptr)␍␊ |
773 | {␍␊ |
774 | if (png_ptr != NULL)␍␊ |
775 | return png_ptr->pass;␍␊ |
776 | return 8; /* invalid */␍␊ |
777 | }␍␊ |
778 | #endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */␍␊ |
779 | #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED ||␍␊ |
780 | PNG_WRITE_USER_TRANSFORM_SUPPORTED */␍␊ |
781 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */␍␊ |
782 | |