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1 | |
2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers) | |
3 | * | |
4 | * libpng 1.0.1 | |
5 | * For conditions of distribution and use, see copyright notice in png.h | |
6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. | |
7 | * Copyright (c) 1996, 1997 Andreas Dilger | |
8 | * Copyright (c) 1998, Glenn Randers-Pehrson | |
9 | * March 15, 1998 | |
10 | */ | |
11 | ||
12 | #define PNG_INTERNAL | |
13 | #include "png.h" | |
14 | ||
15 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | |
16 | /* turn on bgr to rgb mapping */ | |
17 | void | |
18 | png_set_bgr(png_structp png_ptr) | |
19 | { | |
20 | png_debug(1, "in png_set_bgr\n"); | |
21 | png_ptr->transformations |= PNG_BGR; | |
22 | } | |
23 | #endif | |
24 | ||
25 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | |
26 | /* turn on 16 bit byte swapping */ | |
27 | void | |
28 | png_set_swap(png_structp png_ptr) | |
29 | { | |
30 | png_debug(1, "in png_set_swap\n"); | |
31 | if (png_ptr->bit_depth == 16) | |
32 | png_ptr->transformations |= PNG_SWAP_BYTES; | |
33 | } | |
34 | #endif | |
35 | ||
36 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) | |
37 | /* turn on pixel packing */ | |
38 | void | |
39 | png_set_packing(png_structp png_ptr) | |
40 | { | |
41 | png_debug(1, "in png_set_packing\n"); | |
42 | if (png_ptr->bit_depth < 8) | |
43 | { | |
44 | png_ptr->transformations |= PNG_PACK; | |
45 | png_ptr->usr_bit_depth = 8; | |
46 | } | |
47 | } | |
48 | #endif | |
49 | ||
50 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) | |
51 | /* turn on packed pixel swapping */ | |
52 | void | |
53 | png_set_packswap(png_structp png_ptr) | |
54 | { | |
55 | png_debug(1, "in png_set_packswap\n"); | |
56 | if (png_ptr->bit_depth < 8) | |
57 | png_ptr->transformations |= PNG_PACKSWAP; | |
58 | } | |
59 | #endif | |
60 | ||
61 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) | |
62 | void | |
63 | png_set_shift(png_structp png_ptr, png_color_8p true_bits) | |
64 | { | |
65 | png_debug(1, "in png_set_shift\n"); | |
66 | png_ptr->transformations |= PNG_SHIFT; | |
67 | png_ptr->shift = *true_bits; | |
68 | } | |
69 | #endif | |
70 | ||
71 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ | |
72 | defined(PNG_WRITE_INTERLACING_SUPPORTED) | |
73 | int | |
74 | png_set_interlace_handling(png_structp png_ptr) | |
75 | { | |
76 | png_debug(1, "in png_set_interlace handling\n"); | |
77 | if (png_ptr->interlaced) | |
78 | { | |
79 | png_ptr->transformations |= PNG_INTERLACE; | |
80 | return (7); | |
81 | } | |
82 | ||
83 | return (1); | |
84 | } | |
85 | #endif | |
86 | ||
87 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) | |
88 | /* Add a filler byte on read, or remove a filler or alpha byte on write. | |
89 | * The filler type has changed in v0.95 to allow future 2-byte fillers | |
90 | * for 48-bit input data, as well as avoiding problems with some compilers | |
91 | * which don't like bytes as parameters. | |
92 | */ | |
93 | void | |
94 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) | |
95 | { | |
96 | png_debug(1, "in png_set_filler\n"); | |
97 | png_ptr->transformations |= PNG_FILLER; | |
98 | png_ptr->filler = (png_byte)filler; | |
99 | if (filler_loc == PNG_FILLER_AFTER) | |
100 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; | |
101 | else | |
102 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; | |
103 | ||
104 | /* This should probably go in the "do_filler" routine */ | |
105 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8) | |
106 | { | |
107 | png_ptr->usr_channels = 4; | |
108 | } | |
109 | } | |
110 | #endif | |
111 | ||
112 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ | |
113 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) | |
114 | void | |
115 | png_set_swap_alpha(png_structp png_ptr) | |
116 | { | |
117 | png_debug(1, "in png_set_swap_alpha\n"); | |
118 | png_ptr->transformations |= PNG_SWAP_ALPHA; | |
119 | } | |
120 | #endif | |
121 | ||
122 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ | |
123 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) | |
124 | void | |
125 | png_set_invert_alpha(png_structp png_ptr) | |
126 | { | |
127 | png_debug(1, "in png_set_invert_alpha\n"); | |
128 | png_ptr->transformations |= PNG_INVERT_ALPHA; | |
129 | } | |
130 | #endif | |
131 | ||
132 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) | |
133 | void | |
134 | png_set_invert_mono(png_structp png_ptr) | |
135 | { | |
136 | png_debug(1, "in png_set_invert_mono\n"); | |
137 | png_ptr->transformations |= PNG_INVERT_MONO; | |
138 | } | |
139 | ||
140 | /* invert monocrome grayscale data */ | |
141 | void | |
142 | png_do_invert(png_row_infop row_info, png_bytep row) | |
143 | { | |
144 | png_debug(1, "in png_do_invert\n"); | |
145 | if (row_info->bit_depth == 1 && | |
146 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
147 | row != NULL && row_info != NULL && | |
148 | #endif | |
149 | row_info->color_type == PNG_COLOR_TYPE_GRAY) | |
150 | { | |
151 | png_bytep rp; | |
152 | png_uint_32 i; | |
153 | ||
154 | for (i = 0, rp = row; i < row_info->rowbytes; i++, rp++) | |
155 | { | |
156 | *rp = (png_byte)(~(*rp)); | |
157 | } | |
158 | } | |
159 | } | |
160 | #endif | |
161 | ||
162 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | |
163 | /* swaps byte order on 16 bit depth images */ | |
164 | void | |
165 | png_do_swap(png_row_infop row_info, png_bytep row) | |
166 | { | |
167 | png_debug(1, "in png_do_swap\n"); | |
168 | if ( | |
169 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
170 | row != NULL && row_info != NULL && | |
171 | #endif | |
172 | row_info->bit_depth == 16) | |
173 | { | |
174 | png_bytep rp; | |
175 | png_byte t; | |
176 | png_uint_32 i; | |
177 | ||
178 | for (i = 0, rp = row; | |
179 | i < row_info->width * row_info->channels; | |
180 | i++, rp += 2) | |
181 | { | |
182 | t = *rp; | |
183 | *rp = *(rp + 1); | |
184 | *(rp + 1) = t; | |
185 | } | |
186 | } | |
187 | } | |
188 | #endif | |
189 | ||
190 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) | |
191 | static png_byte onebppswaptable[256] = { | |
192 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, | |
193 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, | |
194 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, | |
195 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, | |
196 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, | |
197 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, | |
198 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, | |
199 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, | |
200 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, | |
201 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, | |
202 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, | |
203 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, | |
204 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, | |
205 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, | |
206 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, | |
207 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, | |
208 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, | |
209 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, | |
210 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, | |
211 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, | |
212 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, | |
213 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, | |
214 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, | |
215 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, | |
216 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, | |
217 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, | |
218 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, | |
219 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, | |
220 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, | |
221 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, | |
222 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, | |
223 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF | |
224 | }; | |
225 | ||
226 | static png_byte twobppswaptable[256] = { | |
227 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, | |
228 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, | |
229 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, | |
230 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, | |
231 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, | |
232 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, | |
233 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, | |
234 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, | |
235 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, | |
236 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, | |
237 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, | |
238 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, | |
239 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, | |
240 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, | |
241 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, | |
242 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, | |
243 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, | |
244 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, | |
245 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, | |
246 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, | |
247 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, | |
248 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, | |
249 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, | |
250 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, | |
251 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, | |
252 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, | |
253 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, | |
254 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, | |
255 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, | |
256 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, | |
257 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, | |
258 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF | |
259 | }; | |
260 | ||
261 | static png_byte fourbppswaptable[256] = { | |
262 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, | |
263 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, | |
264 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, | |
265 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, | |
266 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, | |
267 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, | |
268 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, | |
269 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, | |
270 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, | |
271 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, | |
272 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, | |
273 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, | |
274 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, | |
275 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, | |
276 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, | |
277 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, | |
278 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, | |
279 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, | |
280 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, | |
281 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, | |
282 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, | |
283 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, | |
284 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, | |
285 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, | |
286 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, | |
287 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, | |
288 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, | |
289 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, | |
290 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, | |
291 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, | |
292 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, | |
293 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF | |
294 | }; | |
295 | ||
296 | /* swaps pixel packing order within bytes */ | |
297 | void | |
298 | png_do_packswap(png_row_infop row_info, png_bytep row) | |
299 | { | |
300 | png_debug(1, "in png_do_packswap\n"); | |
301 | if ( | |
302 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
303 | row != NULL && row_info != NULL && | |
304 | #endif | |
305 | row_info->bit_depth < 8) | |
306 | { | |
307 | png_bytep rp, end, table; | |
308 | ||
309 | end = row + row_info->rowbytes; | |
310 | ||
311 | if (row_info->bit_depth == 1) | |
312 | table = onebppswaptable; | |
313 | else if (row_info->bit_depth == 2) | |
314 | table = twobppswaptable; | |
315 | else if (row_info->bit_depth == 4) | |
316 | table = fourbppswaptable; | |
317 | else | |
318 | return; | |
319 | ||
320 | for (rp = row; rp < end; rp++) | |
321 | *rp = table[*rp]; | |
322 | } | |
323 | } | |
324 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ | |
325 | ||
326 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ | |
327 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
328 | /* remove filler or alpha byte(s) */ | |
329 | void | |
330 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) | |
331 | { | |
332 | png_debug(1, "in png_do_strip_filler\n"); | |
333 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
334 | if (row != NULL && row_info != NULL) | |
335 | #endif | |
336 | { | |
337 | /* | |
338 | if (row_info->color_type == PNG_COLOR_TYPE_RGB || | |
339 | row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) | |
340 | */ | |
341 | if (row_info->channels == 4) | |
342 | { | |
343 | if (row_info->bit_depth == 8) | |
344 | { | |
345 | /* This converts from RGBX or RGBA to RGB */ | |
346 | if (flags & PNG_FLAG_FILLER_AFTER) | |
347 | { | |
348 | png_bytep sp, dp; | |
349 | png_uint_32 i; | |
350 | ||
351 | for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++) | |
352 | { | |
353 | *dp++ = *sp++; | |
354 | *dp++ = *sp++; | |
355 | *dp++ = *sp++; | |
356 | sp++; | |
357 | } | |
358 | } | |
359 | /* This converts from XRGB or ARGB to RGB */ | |
360 | else | |
361 | { | |
362 | png_bytep sp, dp; | |
363 | png_uint_32 i; | |
364 | ||
365 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) | |
366 | { | |
367 | sp++; | |
368 | *dp++ = *sp++; | |
369 | *dp++ = *sp++; | |
370 | *dp++ = *sp++; | |
371 | } | |
372 | } | |
373 | row_info->pixel_depth = 24; | |
374 | row_info->rowbytes = row_info->width * 3; | |
375 | } | |
376 | else /* if (row_info->bit_depth == 16) */ | |
377 | { | |
378 | if (flags & PNG_FLAG_FILLER_AFTER) | |
379 | { | |
380 | png_bytep sp, dp; | |
381 | png_uint_32 i; | |
382 | ||
383 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ | |
384 | for (i = 1, sp = row + 8, dp = row + 6; i < row_info->width; i++) | |
385 | { | |
386 | /* This could be (although memcpy is probably slower): | |
387 | png_memcpy(dp, sp, 6); | |
388 | sp += 8; | |
389 | dp += 6; | |
390 | */ | |
391 | *dp++ = *sp++; | |
392 | *dp++ = *sp++; | |
393 | *dp++ = *sp++; | |
394 | *dp++ = *sp++; | |
395 | *dp++ = *sp++; | |
396 | *dp++ = *sp++; | |
397 | sp += 2; | |
398 | } | |
399 | } | |
400 | else | |
401 | { | |
402 | png_bytep sp, dp; | |
403 | png_uint_32 i; | |
404 | ||
405 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ | |
406 | for (i = 0, sp = row + 2, dp = row; i < row_info->width; i++) | |
407 | { | |
408 | /* This could be (although memcpy is probably slower): | |
409 | png_memcpy(dp, sp, 6); | |
410 | sp += 8; | |
411 | dp += 6; | |
412 | */ | |
413 | *dp++ = *sp++; | |
414 | *dp++ = *sp++; | |
415 | *dp++ = *sp++; | |
416 | *dp++ = *sp++; | |
417 | *dp++ = *sp++; | |
418 | *dp++ = *sp++; | |
419 | } | |
420 | } | |
421 | row_info->pixel_depth = 48; | |
422 | row_info->rowbytes = row_info->width * 6; | |
423 | } | |
424 | row_info->channels = 3; | |
425 | } | |
426 | /* | |
427 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY || | |
428 | row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) | |
429 | */ | |
430 | else if (row_info->channels == 2) | |
431 | { | |
432 | if (row_info->bit_depth == 8) | |
433 | { | |
434 | /* This converts from GX or GA to G */ | |
435 | if (flags & PNG_FLAG_FILLER_AFTER) | |
436 | { | |
437 | png_bytep sp, dp; | |
438 | png_uint_32 i; | |
439 | ||
440 | for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++) | |
441 | { | |
442 | *dp++ = *sp++; | |
443 | sp++; | |
444 | } | |
445 | } | |
446 | /* This converts from XG or AG to G */ | |
447 | else | |
448 | { | |
449 | png_bytep sp, dp; | |
450 | png_uint_32 i; | |
451 | ||
452 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) | |
453 | { | |
454 | sp++; | |
455 | *dp++ = *sp++; | |
456 | } | |
457 | } | |
458 | row_info->pixel_depth = 8; | |
459 | row_info->rowbytes = row_info->width; | |
460 | } | |
461 | else /* if (row_info->bit_depth == 16) */ | |
462 | { | |
463 | if (flags & PNG_FLAG_FILLER_AFTER) | |
464 | { | |
465 | png_bytep sp, dp; | |
466 | png_uint_32 i; | |
467 | ||
468 | /* This converts from GGXX or GGAA to GG */ | |
469 | for (i = 1, sp = row + 4, dp = row + 2; i < row_info->width; i++) | |
470 | { | |
471 | *dp++ = *sp++; | |
472 | *dp++ = *sp++; | |
473 | sp += 2; | |
474 | } | |
475 | } | |
476 | else | |
477 | { | |
478 | png_bytep sp, dp; | |
479 | png_uint_32 i; | |
480 | ||
481 | /* This converts from XXGG or AAGG to GG */ | |
482 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) | |
483 | { | |
484 | sp += 2; | |
485 | *dp++ = *sp++; | |
486 | *dp++ = *sp++; | |
487 | } | |
488 | } | |
489 | row_info->pixel_depth = 16; | |
490 | row_info->rowbytes = row_info->width * 2; | |
491 | } | |
492 | row_info->channels = 1; | |
493 | } | |
494 | } | |
495 | } | |
496 | #endif | |
497 | ||
498 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | |
499 | /* swaps red and blue bytes within a pixel */ | |
500 | void | |
501 | png_do_bgr(png_row_infop row_info, png_bytep row) | |
502 | { | |
503 | png_debug(1, "in png_do_bgr\n"); | |
504 | if ( | |
505 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
506 | row != NULL && row_info != NULL && | |
507 | #endif | |
508 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) | |
509 | { | |
510 | if (row_info->bit_depth == 8) | |
511 | { | |
512 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) | |
513 | { | |
514 | png_bytep rp; | |
515 | png_byte save; | |
516 | png_uint_32 i; | |
517 | ||
518 | for (i = 0, rp = row; i < row_info->width; i++, rp += 3) | |
519 | { | |
520 | save = *rp; | |
521 | *rp = *(rp + 2); | |
522 | *(rp + 2) = save; | |
523 | } | |
524 | } | |
525 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) | |
526 | { | |
527 | png_bytep rp; | |
528 | png_byte save; | |
529 | png_uint_32 i; | |
530 | ||
531 | for (i = 0, rp = row; i < row_info->width; i++, rp += 4) | |
532 | { | |
533 | save = *rp; | |
534 | *rp = *(rp + 2); | |
535 | *(rp + 2) = save; | |
536 | } | |
537 | } | |
538 | } | |
539 | else if (row_info->bit_depth == 16) | |
540 | { | |
541 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) | |
542 | { | |
543 | png_bytep rp; | |
544 | png_byte save[2]; | |
545 | png_uint_32 i; | |
546 | ||
547 | for (i = 0, rp = row; i < row_info->width; i++, rp += 6) | |
548 | { | |
549 | save[0] = *rp; | |
550 | save[1] = *(rp + 1); | |
551 | *rp = *(rp + 4); | |
552 | *(rp + 1) = *(rp + 5); | |
553 | *(rp + 4) = save[0]; | |
554 | *(rp + 5) = save[1]; | |
555 | } | |
556 | } | |
557 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) | |
558 | { | |
559 | png_bytep rp; | |
560 | png_byte save[2]; | |
561 | png_uint_32 i; | |
562 | ||
563 | for (i = 0, rp = row; i < row_info->width; i++, rp += 8) | |
564 | { | |
565 | save[0] = *rp; | |
566 | save[1] = *(rp + 1); | |
567 | *rp = *(rp + 4); | |
568 | *(rp + 1) = *(rp + 5); | |
569 | *(rp + 4) = save[0]; | |
570 | *(rp + 5) = save[1]; | |
571 | } | |
572 | } | |
573 | } | |
574 | } | |
575 | } | |
576 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ | |
577 |