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- Committer: Sérgio Benjamim
- Date: 2015-10-10 23:00:20 UTC
- Revision ID: sergio_br2@yahoo.com.br-20151010230020-gdtmmv30zn25396n
Update to 1.6.18.
- files added:
- arm
- contrib/arm-neon
- contrib/conftest
- contrib/examples
- contrib/libtests
- contrib/tools
- projects/owatcom
- projects/vstudio/pnglibconf
- projects/vstudio/pngstest
- projects/vstudio/pngunknown
- projects/vstudio/pngvalid
- tests
- files removed:
- contrib/pngminim/decoder/gather.sh
- projects/visualc6
- projects/xcode
- projects/xcode/libpng.xcodeproj
- files modified:
- ANNOUNCE
- compile *
- contrib/pngminus/png2pnm.bat *
- contrib/pngminus/png2pnm.sh *
- contrib/pngminus/pngminus.bat *
- contrib/pngminus/pngminus.sh *
- contrib/pngminus/pnm2png.bat *
- contrib/pngminus/pnm2png.sh *
- ltmain.sh *
- scripts/libpng-config-body.in *
- test-driver *
added
removed
pngwrite.c
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/* pngwrite.c - general routines to write a PNG file
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*
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* Last changed in libpng 1.4.15 [February 12, 2015]
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* Last changed in libpng 1.6.18 [July 23, 2015]
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5
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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* and license in png.h
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12
*/
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/* Get internal access to png.h */
15
#define PNG_NO_PEDANTIC_WARNINGS
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#include "png.h"
14
#include "pngpriv.h"
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#if defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
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# include <errno.h>
17
#endif
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#ifdef PNG_WRITE_SUPPORTED
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#include "pngpriv.h"
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
22
/* Write out all the unknown chunks for the current given location */
23
static void
24
write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr,
25
unsigned int where)
26
{
27
if (info_ptr->unknown_chunks_num != 0)
28
{
29
png_const_unknown_chunkp up;
30
31
png_debug(5, "writing extra chunks");
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33
for (up = info_ptr->unknown_chunks;
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up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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++up)
36
if ((up->location & where) != 0)
37
{
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/* If per-chunk unknown chunk handling is enabled use it, otherwise
39
* just write the chunks the application has set.
40
*/
41
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
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int keep = png_handle_as_unknown(png_ptr, up->name);
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/* NOTE: this code is radically different from the read side in the
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* matter of handling an ancillary unknown chunk. In the read side
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* the default behavior is to discard it, in the code below the default
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* behavior is to write it. Critical chunks are, however, only
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* written if explicitly listed or if the default is set to write all
49
* unknown chunks.
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*
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* The default handling is also slightly weird - it is not possible to
52
* stop the writing of all unsafe-to-copy chunks!
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*
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* TODO: REVIEW: this would seem to be a bug.
55
*/
56
if (keep != PNG_HANDLE_CHUNK_NEVER &&
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((up->name[3] & 0x20) /* safe-to-copy overrides everything */ ||
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keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(keep == PNG_HANDLE_CHUNK_AS_DEFAULT &&
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png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS)))
61
#endif
62
{
63
/* TODO: review, what is wrong with a zero length unknown chunk? */
64
if (up->size == 0)
65
png_warning(png_ptr, "Writing zero-length unknown chunk");
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png_write_chunk(png_ptr, up->name, up->data, up->size);
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}
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}
70
}
71
}
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#endif /* WRITE_UNKNOWN_CHUNKS */
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/* Writes all the PNG information. This is the suggested way to use the
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* library. If you have a new chunk to add, make a function to write it,
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81
* them in png_write_end(), and compressing them.
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82
*/
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void PNGAPI
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png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
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png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
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{
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png_debug(1, "in png_write_info_before_PLTE");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
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if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
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{
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/* Write PNG signature */
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png_write_sig(png_ptr);
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/* Write PNG signature */
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png_write_sig(png_ptr);
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#ifdef PNG_MNG_FEATURES_SUPPORTED
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if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \
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(png_ptr->mng_features_permitted))
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{
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png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
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png_ptr->mng_features_permitted = 0;
46
}
97
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 && \
98
png_ptr->mng_features_permitted != 0)
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{
100
png_warning(png_ptr,
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"MNG features are not allowed in a PNG datastream");
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png_ptr->mng_features_permitted = 0;
103
}
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#endif
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/* Write IHDR information. */
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png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
50
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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info_ptr->filter_type,
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/* Write IHDR information. */
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png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
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info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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info_ptr->filter_type,
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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info_ptr->interlace_type);
54
#else
55
0);
56
#endif
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/* The rest of these check to see if the valid field has the appropriate
58
* flag set, and if it does, writes the chunk.
59
*/
60
#ifdef PNG_WRITE_gAMA_SUPPORTED
61
if (info_ptr->valid & PNG_INFO_gAMA)
62
{
63
# ifdef PNG_FLOATING_POINT_SUPPORTED
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png_write_gAMA(png_ptr, info_ptr->gamma);
65
#else
66
#ifdef PNG_FIXED_POINT_SUPPORTED
67
png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
68
# endif
69
#endif
70
}
71
#endif
72
#ifdef PNG_WRITE_sRGB_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sRGB)
74
png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
75
#endif
76
#ifdef PNG_WRITE_iCCP_SUPPORTED
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if (info_ptr->valid & PNG_INFO_iCCP)
78
png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
79
info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
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#endif
111
info_ptr->interlace_type
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#else
113
0
114
#endif
115
);
116
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/* The rest of these check to see if the valid field has the appropriate
118
* flag set, and if it does, writes the chunk.
119
*
120
* 1.6.0: COLORSPACE support controls the writing of these chunks too, and
121
* the chunks will be written if the WRITE routine is there and
122
* information * is available in the COLORSPACE. (See
123
* png_colorspace_sync_info in png.c for where the valid flags get set.)
124
*
125
* Under certain circumstances the colorspace can be invalidated without
126
* syncing the info_struct 'valid' flags; this happens if libpng detects
127
* an error and calls png_error while the color space is being set, yet
128
* the application continues writing the PNG. So check the 'invalid'
129
* flag here too.
130
*/
131
#ifdef PNG_GAMMA_SUPPORTED
132
# ifdef PNG_WRITE_gAMA_SUPPORTED
133
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
134
(info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) != 0 &&
135
(info_ptr->valid & PNG_INFO_gAMA) != 0)
136
png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma);
137
# endif
138
#endif
139
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#ifdef PNG_COLORSPACE_SUPPORTED
141
/* Write only one of sRGB or an ICC profile. If a profile was supplied
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* and it matches one of the known sRGB ones issue a warning.
143
*/
144
# ifdef PNG_WRITE_iCCP_SUPPORTED
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if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
146
(info_ptr->valid & PNG_INFO_iCCP) != 0)
147
{
148
# ifdef PNG_WRITE_sRGB_SUPPORTED
149
if ((info_ptr->valid & PNG_INFO_sRGB) != 0)
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png_app_warning(png_ptr,
151
"profile matches sRGB but writing iCCP instead");
152
# endif
153
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png_write_iCCP(png_ptr, info_ptr->iccp_name,
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info_ptr->iccp_profile);
156
}
157
# ifdef PNG_WRITE_sRGB_SUPPORTED
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else
159
# endif
160
# endif
161
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# ifdef PNG_WRITE_sRGB_SUPPORTED
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if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
164
(info_ptr->valid & PNG_INFO_sRGB) != 0)
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png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent);
166
# endif /* WRITE_sRGB */
167
#endif /* COLORSPACE */
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#ifdef PNG_WRITE_sBIT_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sBIT)
83
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
170
if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
171
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
84
172
#endif
85
#ifdef PNG_WRITE_cHRM_SUPPORTED
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if (info_ptr->valid & PNG_INFO_cHRM)
87
{
88
#ifdef PNG_FLOATING_POINT_SUPPORTED
89
png_write_cHRM(png_ptr,
90
info_ptr->x_white, info_ptr->y_white,
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info_ptr->x_red, info_ptr->y_red,
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info_ptr->x_green, info_ptr->y_green,
93
info_ptr->x_blue, info_ptr->y_blue);
94
#else
95
# ifdef PNG_FIXED_POINT_SUPPORTED
96
png_write_cHRM_fixed(png_ptr,
97
info_ptr->int_x_white, info_ptr->int_y_white,
98
info_ptr->int_x_red, info_ptr->int_y_red,
99
info_ptr->int_x_green, info_ptr->int_y_green,
100
info_ptr->int_x_blue, info_ptr->int_y_blue);
173
174
#ifdef PNG_COLORSPACE_SUPPORTED
175
# ifdef PNG_WRITE_cHRM_SUPPORTED
176
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
177
(info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0 &&
178
(info_ptr->valid & PNG_INFO_cHRM) != 0)
179
png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy);
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# endif
102
181
#endif
103
}
104
#endif
182
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
106
if (info_ptr->unknown_chunks_num)
107
{
108
png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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112
for (up = info_ptr->unknown_chunks;
113
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
114
up++)
115
{
116
int keep = png_handle_as_unknown(png_ptr, up->name);
117
if (keep != PNG_HANDLE_CHUNK_NEVER &&
118
up->location && !(up->location & PNG_HAVE_PLTE) &&
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!(up->location & PNG_HAVE_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
122
{
123
if (up->size == 0)
124
png_warning(png_ptr, "Writing zero-length unknown chunk");
125
png_write_chunk(png_ptr, up->name, up->data, up->size);
126
}
127
}
128
}
184
write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR);
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185
#endif
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png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
131
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}
132
189
}
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void PNGAPI
135
png_write_info(png_structp png_ptr, png_infop info_ptr)
192
png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
136
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{
137
194
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
138
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int i;
145
202
146
203
png_write_info_before_PLTE(png_ptr, info_ptr);
147
204
148
if (info_ptr->valid & PNG_INFO_PLTE)
205
if ((info_ptr->valid & PNG_INFO_PLTE) != 0)
149
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png_write_PLTE(png_ptr, info_ptr->palette,
150
(png_uint_32)info_ptr->num_palette);
151
else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
207
(png_uint_32)info_ptr->num_palette);
208
209
else if ((info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) !=0)
152
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png_error(png_ptr, "Valid palette required for paletted images");
153
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#ifdef PNG_WRITE_tRNS_SUPPORTED
155
if (info_ptr->valid & PNG_INFO_tRNS)
213
if ((info_ptr->valid & PNG_INFO_tRNS) !=0)
156
214
{
157
215
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
158
216
/* Invert the alpha channel (in tRNS) */
159
if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
160
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
217
if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0 &&
218
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
161
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{
162
int j;
163
for (j = 0; j<(int)info_ptr->num_trans; j++)
164
info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]);
220
int j, jend;
221
222
jend = info_ptr->num_trans;
223
if (jend > PNG_MAX_PALETTE_LENGTH)
224
jend = PNG_MAX_PALETTE_LENGTH;
225
226
for (j = 0; j<jend; ++j)
227
info_ptr->trans_alpha[j] =
228
(png_byte)(255 - info_ptr->trans_alpha[j]);
165
229
}
166
230
#endif
167
231
png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
168
info_ptr->num_trans, info_ptr->color_type);
232
info_ptr->num_trans, info_ptr->color_type);
169
233
}
170
234
#endif
171
235
#ifdef PNG_WRITE_bKGD_SUPPORTED
172
if (info_ptr->valid & PNG_INFO_bKGD)
236
if ((info_ptr->valid & PNG_INFO_bKGD) != 0)
173
237
png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
174
238
#endif
239
175
240
#ifdef PNG_WRITE_hIST_SUPPORTED
176
if (info_ptr->valid & PNG_INFO_hIST)
241
if ((info_ptr->valid & PNG_INFO_hIST) != 0)
177
242
png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
178
243
#endif
244
179
245
#ifdef PNG_WRITE_oFFs_SUPPORTED
180
if (info_ptr->valid & PNG_INFO_oFFs)
246
if ((info_ptr->valid & PNG_INFO_oFFs) != 0)
181
247
png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
182
info_ptr->offset_unit_type);
248
info_ptr->offset_unit_type);
183
249
#endif
250
184
251
#ifdef PNG_WRITE_pCAL_SUPPORTED
185
if (info_ptr->valid & PNG_INFO_pCAL)
252
if ((info_ptr->valid & PNG_INFO_pCAL) != 0)
186
253
png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
187
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
188
info_ptr->pcal_units, info_ptr->pcal_params);
254
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
255
info_ptr->pcal_units, info_ptr->pcal_params);
189
256
#endif
190
257
191
#ifdef PNG_sCAL_SUPPORTED
192
if (info_ptr->valid & PNG_INFO_sCAL)
193
258
#ifdef PNG_WRITE_sCAL_SUPPORTED
194
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
195
png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
196
info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
197
#else /* !FLOATING_POINT */
198
#ifdef PNG_FIXED_POINT_SUPPORTED
259
if ((info_ptr->valid & PNG_INFO_sCAL) != 0)
199
260
png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
200
261
info_ptr->scal_s_width, info_ptr->scal_s_height);
201
#endif /* FIXED_POINT */
202
#endif /* FLOATING_POINT */
203
#else /* !WRITE_sCAL */
204
png_warning(png_ptr,
205
"png_write_sCAL not supported; sCAL chunk not written");
206
#endif /* WRITE_sCAL */
207
262
#endif /* sCAL */
208
263
209
264
#ifdef PNG_WRITE_pHYs_SUPPORTED
210
if (info_ptr->valid & PNG_INFO_pHYs)
265
if ((info_ptr->valid & PNG_INFO_pHYs) != 0)
211
266
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
212
info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
267
info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
213
268
#endif /* pHYs */
214
269
215
270
#ifdef PNG_WRITE_tIME_SUPPORTED
216
if (info_ptr->valid & PNG_INFO_tIME)
271
if ((info_ptr->valid & PNG_INFO_tIME) != 0)
217
272
{
218
273
png_write_tIME(png_ptr, &(info_ptr->mod_time));
219
274
png_ptr->mode |= PNG_WROTE_tIME;
221
276
#endif /* tIME */
222
277
223
278
#ifdef PNG_WRITE_sPLT_SUPPORTED
224
if (info_ptr->valid & PNG_INFO_sPLT)
225
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
226
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
279
if ((info_ptr->valid & PNG_INFO_sPLT) != 0)
280
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
281
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
227
282
#endif /* sPLT */
228
283
229
284
#ifdef PNG_WRITE_TEXT_SUPPORTED
231
286
for (i = 0; i < info_ptr->num_text; i++)
232
287
{
233
288
png_debug2(2, "Writing header text chunk %d, type %d", i,
234
info_ptr->text[i].compression);
289
info_ptr->text[i].compression);
235
290
/* An internationalized chunk? */
236
291
if (info_ptr->text[i].compression > 0)
237
292
{
238
293
#ifdef PNG_WRITE_iTXt_SUPPORTED
239
/* Write international chunk */
240
png_write_iTXt(png_ptr,
241
info_ptr->text[i].compression,
242
info_ptr->text[i].key,
243
info_ptr->text[i].lang,
244
info_ptr->text[i].lang_key,
245
info_ptr->text[i].text);
294
/* Write international chunk */
295
png_write_iTXt(png_ptr,
296
info_ptr->text[i].compression,
297
info_ptr->text[i].key,
298
info_ptr->text[i].lang,
299
info_ptr->text[i].lang_key,
300
info_ptr->text[i].text);
301
/* Mark this chunk as written */
302
if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
303
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
304
else
305
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
246
306
#else
247
png_warning(png_ptr, "Unable to write international text");
307
png_warning(png_ptr, "Unable to write international text");
248
308
#endif
249
/* Mark this chunk as written */
250
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
251
309
}
310
252
311
/* If we want a compressed text chunk */
253
312
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
254
313
{
255
314
#ifdef PNG_WRITE_zTXt_SUPPORTED
256
315
/* Write compressed chunk */
257
316
png_write_zTXt(png_ptr, info_ptr->text[i].key,
258
info_ptr->text[i].text, 0,
259
info_ptr->text[i].compression);
317
info_ptr->text[i].text, info_ptr->text[i].compression);
318
/* Mark this chunk as written */
319
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
260
320
#else
261
321
png_warning(png_ptr, "Unable to write compressed text");
262
322
#endif
263
/* Mark this chunk as written */
264
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
265
323
}
324
266
325
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
267
326
{
268
327
#ifdef PNG_WRITE_tEXt_SUPPORTED
269
328
/* Write uncompressed chunk */
270
329
png_write_tEXt(png_ptr, info_ptr->text[i].key,
271
info_ptr->text[i].text,
272
0);
330
info_ptr->text[i].text,
331
0);
273
332
/* Mark this chunk as written */
274
333
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
275
334
#else
281
340
#endif /* tEXt */
282
341
283
342
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
284
if (info_ptr->unknown_chunks_num)
285
{
286
png_unknown_chunk *up;
287
288
png_debug(5, "writing extra chunks");
289
290
for (up = info_ptr->unknown_chunks;
291
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
292
up++)
293
{
294
int keep = png_handle_as_unknown(png_ptr, up->name);
295
if (keep != PNG_HANDLE_CHUNK_NEVER &&
296
up->location && (up->location & PNG_HAVE_PLTE) &&
297
!(up->location & PNG_HAVE_IDAT) &&
298
!(up->location & PNG_AFTER_IDAT) &&
299
((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
300
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
301
{
302
png_write_chunk(png_ptr, up->name, up->data, up->size);
303
}
304
}
305
}
343
write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE);
306
344
#endif
307
345
}
308
346
312
350
* comments, I suggest writing them here, and compressing them.
313
351
*/
314
352
void PNGAPI
315
png_write_end(png_structp png_ptr, png_infop info_ptr)
353
png_write_end(png_structrp png_ptr, png_inforp info_ptr)
316
354
{
317
355
png_debug(1, "in png_write_end");
318
356
319
357
if (png_ptr == NULL)
320
358
return;
321
if (!(png_ptr->mode & PNG_HAVE_IDAT))
359
360
if ((png_ptr->mode & PNG_HAVE_IDAT) == 0)
322
361
png_error(png_ptr, "No IDATs written into file");
323
362
363
#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
364
if (png_ptr->num_palette_max > png_ptr->num_palette)
365
png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
366
#endif
367
324
368
/* See if user wants us to write information chunks */
325
369
if (info_ptr != NULL)
326
370
{
329
373
#endif
330
374
#ifdef PNG_WRITE_tIME_SUPPORTED
331
375
/* Check to see if user has supplied a time chunk */
332
if ((info_ptr->valid & PNG_INFO_tIME) &&
333
!(png_ptr->mode & PNG_WROTE_tIME))
376
if ((info_ptr->valid & PNG_INFO_tIME) != 0 &&
377
(png_ptr->mode & PNG_WROTE_tIME) == 0)
334
378
png_write_tIME(png_ptr, &(info_ptr->mod_time));
379
335
380
#endif
336
381
#ifdef PNG_WRITE_TEXT_SUPPORTED
337
382
/* Loop through comment chunks */
345
390
#ifdef PNG_WRITE_iTXt_SUPPORTED
346
391
/* Write international chunk */
347
392
png_write_iTXt(png_ptr,
348
info_ptr->text[i].compression,
349
info_ptr->text[i].key,
350
info_ptr->text[i].lang,
351
info_ptr->text[i].lang_key,
352
info_ptr->text[i].text);
393
info_ptr->text[i].compression,
394
info_ptr->text[i].key,
395
info_ptr->text[i].lang,
396
info_ptr->text[i].lang_key,
397
info_ptr->text[i].text);
398
/* Mark this chunk as written */
399
if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
400
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
401
else
402
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
353
403
#else
354
404
png_warning(png_ptr, "Unable to write international text");
355
405
#endif
356
/* Mark this chunk as written */
357
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
358
406
}
407
359
408
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
360
409
{
361
410
#ifdef PNG_WRITE_zTXt_SUPPORTED
362
411
/* Write compressed chunk */
363
412
png_write_zTXt(png_ptr, info_ptr->text[i].key,
364
info_ptr->text[i].text, 0,
365
info_ptr->text[i].compression);
413
info_ptr->text[i].text, info_ptr->text[i].compression);
414
/* Mark this chunk as written */
415
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
366
416
#else
367
417
png_warning(png_ptr, "Unable to write compressed text");
368
418
#endif
369
/* Mark this chunk as written */
370
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
371
419
}
420
372
421
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
373
422
{
374
423
#ifdef PNG_WRITE_tEXt_SUPPORTED
375
424
/* Write uncompressed chunk */
376
425
png_write_tEXt(png_ptr, info_ptr->text[i].key,
377
info_ptr->text[i].text, 0);
426
info_ptr->text[i].text, 0);
427
/* Mark this chunk as written */
428
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
378
429
#else
379
430
png_warning(png_ptr, "Unable to write uncompressed text");
380
431
#endif
381
382
/* Mark this chunk as written */
383
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
384
432
}
385
433
}
386
434
#endif
387
435
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
388
if (info_ptr->unknown_chunks_num)
389
{
390
png_unknown_chunk *up;
391
392
png_debug(5, "writing extra chunks");
393
394
for (up = info_ptr->unknown_chunks;
395
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
396
up++)
397
{
398
int keep = png_handle_as_unknown(png_ptr, up->name);
399
if (keep != PNG_HANDLE_CHUNK_NEVER &&
400
up->location && (up->location & PNG_AFTER_IDAT) &&
401
((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
402
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
403
{
404
png_write_chunk(png_ptr, up->name, up->data, up->size);
405
}
406
}
407
}
436
write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT);
408
437
#endif
409
438
}
410
439
412
441
413
442
/* Write end of PNG file */
414
443
png_write_IEND(png_ptr);
444
415
445
/* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
416
446
* and restored again in libpng-1.2.30, may cause some applications that
417
447
* do not set png_ptr->output_flush_fn to crash. If your application
427
457
}
428
458
429
459
#ifdef PNG_CONVERT_tIME_SUPPORTED
430
/* "tm" structure is not supported on WindowsCE */
431
460
void PNGAPI
432
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
461
png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime)
433
462
{
434
463
png_debug(1, "in png_convert_from_struct_tm");
435
464
454
483
#endif
455
484
456
485
/* Initialize png_ptr structure, and allocate any memory needed */
457
png_structp PNGAPI
458
png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
459
png_error_ptr error_fn, png_error_ptr warn_fn)
486
PNG_FUNCTION(png_structp,PNGAPI
487
png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
488
png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
460
489
{
461
#ifdef PNG_USER_MEM_SUPPORTED
462
return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
463
warn_fn, NULL, NULL, NULL));
490
#ifndef PNG_USER_MEM_SUPPORTED
491
png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
492
error_fn, warn_fn, NULL, NULL, NULL);
493
#else
494
return png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
495
warn_fn, NULL, NULL, NULL);
464
496
}
465
497
466
498
/* Alternate initialize png_ptr structure, and allocate any memory needed */
467
png_structp PNGAPI
468
png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
469
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
470
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
499
PNG_FUNCTION(png_structp,PNGAPI
500
png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
501
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
502
png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
471
503
{
472
#endif /* PNG_USER_MEM_SUPPORTED */
473
volatile int png_cleanup_needed = 0;
474
#ifdef PNG_SETJMP_SUPPORTED
475
volatile
476
#endif
477
png_structp png_ptr;
478
#ifdef PNG_SETJMP_SUPPORTED
479
#ifdef USE_FAR_KEYWORD
480
jmp_buf jmpbuf;
481
#endif
482
#endif
483
484
png_debug(1, "in png_create_write_struct");
485
486
#ifdef PNG_USER_MEM_SUPPORTED
487
png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
488
(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
489
#else
490
png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
491
#endif /* PNG_USER_MEM_SUPPORTED */
492
if (png_ptr == NULL)
493
return (NULL);
494
495
/* Added at libpng-1.2.6 */
496
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
497
png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
498
png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
499
#endif
500
501
#ifdef PNG_SETJMP_SUPPORTED
502
/* Applications that neglect to set up their own setjmp() and then
503
encounter a png_error() will longjmp here. Since the jmpbuf is
504
then meaningless we abort instead of returning. */
505
#ifdef USE_FAR_KEYWORD
506
if (setjmp(jmpbuf))
507
#else
508
if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */
509
#endif
510
#ifdef USE_FAR_KEYWORD
511
png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf));
512
#endif
513
PNG_ABORT();
514
#endif
515
516
#ifdef PNG_USER_MEM_SUPPORTED
517
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
518
#endif /* PNG_USER_MEM_SUPPORTED */
519
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
520
521
if (user_png_ver != NULL)
522
{
523
int i = -1;
524
int found_dots = 0;
525
526
do
527
{
528
i++;
529
if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i])
530
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
531
if (user_png_ver[i] == '.')
532
found_dots++;
533
} while (found_dots < 2 && user_png_ver[i] != 0 &&
534
PNG_LIBPNG_VER_STRING[i] != 0);
535
}
536
537
if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
538
{
539
/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
540
* we must recompile any applications that use any older library version.
541
* For versions after libpng 1.0, we will be compatible, so we need
542
* only check the first digit.
543
*/
544
if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
545
(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
546
(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
547
{
548
#ifdef PNG_STDIO_SUPPORTED
549
char msg[80];
550
if (user_png_ver)
551
{
552
png_snprintf(msg, 80,
553
"Application was compiled with png.h from libpng-%.20s",
554
user_png_ver);
555
png_warning(png_ptr, msg);
556
}
557
png_snprintf(msg, 80,
558
"Application is running with png.c from libpng-%.20s",
559
png_libpng_ver);
560
png_warning(png_ptr, msg);
561
#endif
562
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
563
png_ptr->flags = 0;
564
#endif
565
png_warning(png_ptr,
566
"Incompatible libpng version in application and library");
567
png_cleanup_needed = 1;
568
}
569
}
570
571
/* Initialize zbuf - compression buffer */
572
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
573
if (!png_cleanup_needed)
574
{
575
png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
576
png_ptr->zbuf_size);
577
if (png_ptr->zbuf == NULL)
578
png_cleanup_needed = 1;
579
}
580
if (png_cleanup_needed)
581
{
582
/* Clean up PNG structure and deallocate any memory. */
583
png_free(png_ptr, png_ptr->zbuf);
584
png_ptr->zbuf = NULL;
585
#ifdef PNG_USER_MEM_SUPPORTED
586
png_destroy_struct_2((png_voidp)png_ptr,
587
(png_free_ptr)free_fn, (png_voidp)mem_ptr);
588
#else
589
png_destroy_struct((png_voidp)png_ptr);
590
#endif
591
return (NULL);
592
}
593
594
png_set_write_fn(png_ptr, NULL, NULL, NULL);
595
596
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
597
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
598
1, NULL, NULL);
599
#endif
600
601
return (png_ptr);
504
png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
505
error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
506
#endif /* USER_MEM */
507
if (png_ptr != NULL)
508
{
509
/* Set the zlib control values to defaults; they can be overridden by the
510
* application after the struct has been created.
511
*/
512
png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
513
514
/* The 'zlib_strategy' setting is irrelevant because png_default_claim in
515
* pngwutil.c defaults it according to whether or not filters will be
516
* used, and ignores this setting.
517
*/
518
png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
519
png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
520
png_ptr->zlib_mem_level = 8;
521
png_ptr->zlib_window_bits = 15;
522
png_ptr->zlib_method = 8;
523
524
#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
525
png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY;
526
png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION;
527
png_ptr->zlib_text_mem_level = 8;
528
png_ptr->zlib_text_window_bits = 15;
529
png_ptr->zlib_text_method = 8;
530
#endif /* WRITE_COMPRESSED_TEXT */
531
532
/* This is a highly dubious configuration option; by default it is off,
533
* but it may be appropriate for private builds that are testing
534
* extensions not conformant to the current specification, or of
535
* applications that must not fail to write at all costs!
536
*/
537
#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
538
/* In stable builds only warn if an application error can be completely
539
* handled.
540
*/
541
png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
542
#endif
543
544
/* App warnings are warnings in release (or release candidate) builds but
545
* are errors during development.
546
*/
547
#if PNG_RELEASE_BUILD
548
png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
549
#endif
550
551
/* TODO: delay this, it can be done in png_init_io() (if the app doesn't
552
* do it itself) avoiding setting the default function if it is not
553
* required.
554
*/
555
png_set_write_fn(png_ptr, NULL, NULL, NULL);
556
}
557
558
return png_ptr;
602
559
}
603
560
604
561
608
565
* "write" the image seven times.
609
566
*/
610
567
void PNGAPI
611
png_write_rows(png_structp png_ptr, png_bytepp row,
612
png_uint_32 num_rows)
568
png_write_rows(png_structrp png_ptr, png_bytepp row,
569
png_uint_32 num_rows)
613
570
{
614
571
png_uint_32 i; /* row counter */
615
572
png_bytepp rp; /* row pointer */
630
587
* if you are writing an interlaced image.
631
588
*/
632
589
void PNGAPI
633
png_write_image(png_structp png_ptr, png_bytepp image)
590
png_write_image(png_structrp png_ptr, png_bytepp image)
634
591
{
635
592
png_uint_32 i; /* row index */
636
593
int pass, num_pass; /* pass variables */
660
617
}
661
618
}
662
619
620
#ifdef PNG_MNG_FEATURES_SUPPORTED
621
/* Performs intrapixel differencing */
622
static void
623
png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
624
{
625
png_debug(1, "in png_do_write_intrapixel");
626
627
if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
628
{
629
int bytes_per_pixel;
630
png_uint_32 row_width = row_info->width;
631
if (row_info->bit_depth == 8)
632
{
633
png_bytep rp;
634
png_uint_32 i;
635
636
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
637
bytes_per_pixel = 3;
638
639
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
640
bytes_per_pixel = 4;
641
642
else
643
return;
644
645
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
646
{
647
*(rp) = (png_byte)(*rp - *(rp + 1));
648
*(rp + 2) = (png_byte)(*(rp + 2) - *(rp + 1));
649
}
650
}
651
652
#ifdef PNG_WRITE_16BIT_SUPPORTED
653
else if (row_info->bit_depth == 16)
654
{
655
png_bytep rp;
656
png_uint_32 i;
657
658
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
659
bytes_per_pixel = 6;
660
661
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
662
bytes_per_pixel = 8;
663
664
else
665
return;
666
667
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
668
{
669
png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
670
png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
671
png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
672
png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
673
png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
674
*(rp ) = (png_byte)(red >> 8);
675
*(rp + 1) = (png_byte)red;
676
*(rp + 4) = (png_byte)(blue >> 8);
677
*(rp + 5) = (png_byte)blue;
678
}
679
}
680
#endif /* WRITE_16BIT */
681
}
682
}
683
#endif /* MNG_FEATURES */
684
663
685
/* Called by user to write a row of image data */
664
686
void PNGAPI
665
png_write_row(png_structp png_ptr, png_bytep row)
687
png_write_row(png_structrp png_ptr, png_const_bytep row)
666
688
{
689
/* 1.5.6: moved from png_struct to be a local structure: */
690
png_row_info row_info;
691
667
692
if (png_ptr == NULL)
668
693
return;
669
694
670
png_debug2(1, "in png_write_row (row %lu, pass %d)",
671
(unsigned long)png_ptr->row_number, png_ptr->pass);
695
png_debug2(1, "in png_write_row (row %u, pass %d)",
696
png_ptr->row_number, png_ptr->pass);
672
697
673
698
/* Initialize transformations and other stuff if first time */
674
699
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
675
700
{
676
701
/* Make sure we wrote the header info */
677
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
702
if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
678
703
png_error(png_ptr,
679
"png_write_info was never called before png_write_row");
704
"png_write_info was never called before png_write_row");
680
705
681
706
/* Check for transforms that have been set but were defined out */
682
707
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
683
if (png_ptr->transformations & PNG_INVERT_MONO)
708
if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
684
709
png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined");
685
710
#endif
711
686
712
#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
687
if (png_ptr->transformations & PNG_FILLER)
713
if ((png_ptr->transformations & PNG_FILLER) != 0)
688
714
png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined");
689
715
#endif
690
716
#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
691
717
defined(PNG_READ_PACKSWAP_SUPPORTED)
692
if (png_ptr->transformations & PNG_PACKSWAP)
718
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
693
719
png_warning(png_ptr,
694
720
"PNG_WRITE_PACKSWAP_SUPPORTED is not defined");
695
721
#endif
722
696
723
#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
697
if (png_ptr->transformations & PNG_PACK)
724
if ((png_ptr->transformations & PNG_PACK) != 0)
698
725
png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined");
699
726
#endif
727
700
728
#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
701
if (png_ptr->transformations & PNG_SHIFT)
729
if ((png_ptr->transformations & PNG_SHIFT) != 0)
702
730
png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined");
703
731
#endif
732
704
733
#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
705
if (png_ptr->transformations & PNG_BGR)
734
if ((png_ptr->transformations & PNG_BGR) != 0)
706
735
png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined");
707
736
#endif
737
708
738
#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
709
if (png_ptr->transformations & PNG_SWAP_BYTES)
739
if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
710
740
png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined");
711
741
#endif
712
742
715
745
716
746
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
717
747
/* If interlaced and not interested in row, return */
718
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
748
if (png_ptr->interlaced != 0 &&
749
(png_ptr->transformations & PNG_INTERLACE) != 0)
719
750
{
720
751
switch (png_ptr->pass)
721
752
{
722
753
case 0:
723
if (png_ptr->row_number & 0x07)
754
if ((png_ptr->row_number & 0x07) != 0)
724
755
{
725
756
png_write_finish_row(png_ptr);
726
757
return;
727
758
}
728
759
break;
760
729
761
case 1:
730
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
762
if ((png_ptr->row_number & 0x07) != 0 || png_ptr->width < 5)
731
763
{
732
764
png_write_finish_row(png_ptr);
733
765
return;
734
766
}
735
767
break;
768
736
769
case 2:
737
770
if ((png_ptr->row_number & 0x07) != 4)
738
771
{
740
773
return;
741
774
}
742
775
break;
776
743
777
case 3:
744
if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
778
if ((png_ptr->row_number & 0x03) != 0 || png_ptr->width < 3)
745
779
{
746
780
png_write_finish_row(png_ptr);
747
781
return;
748
782
}
749
783
break;
784
750
785
case 4:
751
786
if ((png_ptr->row_number & 0x03) != 2)
752
787
{
754
789
return;
755
790
}
756
791
break;
792
757
793
case 5:
758
if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
794
if ((png_ptr->row_number & 0x01) != 0 || png_ptr->width < 2)
759
795
{
760
796
png_write_finish_row(png_ptr);
761
797
return;
762
798
}
763
799
break;
800
764
801
case 6:
765
if (!(png_ptr->row_number & 0x01))
802
if ((png_ptr->row_number & 0x01) == 0)
766
803
{
767
804
png_write_finish_row(png_ptr);
768
805
return;
769
806
}
770
807
break;
808
809
default: /* error: ignore it */
810
break;
771
811
}
772
812
}
773
813
#endif
774
814
775
815
/* Set up row info for transformations */
776
png_ptr->row_info.color_type = png_ptr->color_type;
777
png_ptr->row_info.width = png_ptr->usr_width;
778
png_ptr->row_info.channels = png_ptr->usr_channels;
779
png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
780
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
781
png_ptr->row_info.channels);
782
783
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
784
png_ptr->row_info.width);
785
786
png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
787
png_debug1(3, "row_info->width = %lu",
788
(unsigned long)png_ptr->row_info.width);
789
png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
790
png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
791
png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
792
png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
816
row_info.color_type = png_ptr->color_type;
817
row_info.width = png_ptr->usr_width;
818
row_info.channels = png_ptr->usr_channels;
819
row_info.bit_depth = png_ptr->usr_bit_depth;
820
row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
821
row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
822
823
png_debug1(3, "row_info->color_type = %d", row_info.color_type);
824
png_debug1(3, "row_info->width = %u", row_info.width);
825
png_debug1(3, "row_info->channels = %d", row_info.channels);
826
png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth);
827
png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth);
828
png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes);
793
829
794
830
/* Copy user's row into buffer, leaving room for filter byte. */
795
png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
831
memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes);
796
832
797
833
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
798
834
/* Handle interlacing */
799
835
if (png_ptr->interlaced && png_ptr->pass < 6 &&
800
(png_ptr->transformations & PNG_INTERLACE))
836
(png_ptr->transformations & PNG_INTERLACE) != 0)
801
837
{
802
png_do_write_interlace(&(png_ptr->row_info),
803
png_ptr->row_buf + 1, png_ptr->pass);
838
png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
804
839
/* This should always get caught above, but still ... */
805
if (!(png_ptr->row_info.width))
840
if (row_info.width == 0)
806
841
{
807
842
png_write_finish_row(png_ptr);
808
843
return;
810
845
}
811
846
#endif
812
847
848
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
813
849
/* Handle other transformations */
814
if (png_ptr->transformations)
815
png_do_write_transformations(png_ptr);
850
if (png_ptr->transformations != 0)
851
png_do_write_transformations(png_ptr, &row_info);
852
#endif
853
854
/* At this point the row_info pixel depth must match the 'transformed' depth,
855
* which is also the output depth.
856
*/
857
if (row_info.pixel_depth != png_ptr->pixel_depth ||
858
row_info.pixel_depth != png_ptr->transformed_pixel_depth)
859
png_error(png_ptr, "internal write transform logic error");
816
860
817
861
#ifdef PNG_MNG_FEATURES_SUPPORTED
818
862
/* Write filter_method 64 (intrapixel differencing) only if
824
868
* 4. The filter_method is 64 and
825
869
* 5. The color_type is RGB or RGBA
826
870
*/
827
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
828
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
871
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
872
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
829
873
{
830
874
/* Intrapixel differencing */
831
png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
875
png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1);
832
876
}
833
877
#endif
834
878
879
/* Added at libpng-1.5.10 */
880
#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
881
/* Check for out-of-range palette index */
882
if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
883
png_ptr->num_palette_max >= 0)
884
png_do_check_palette_indexes(png_ptr, &row_info);
885
#endif
886
835
887
/* Find a filter if necessary, filter the row and write it out. */
836
png_write_find_filter(png_ptr, &(png_ptr->row_info));
888
png_write_find_filter(png_ptr, &row_info);
837
889
838
890
if (png_ptr->write_row_fn != NULL)
839
891
(*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
842
894
#ifdef PNG_WRITE_FLUSH_SUPPORTED
843
895
/* Set the automatic flush interval or 0 to turn flushing off */
844
896
void PNGAPI
845
png_set_flush(png_structp png_ptr, int nrows)
897
png_set_flush(png_structrp png_ptr, int nrows)
846
898
{
847
899
png_debug(1, "in png_set_flush");
848
900
849
901
if (png_ptr == NULL)
850
902
return;
903
851
904
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
852
905
}
853
906
854
907
/* Flush the current output buffers now */
855
908
void PNGAPI
856
png_write_flush(png_structp png_ptr)
909
png_write_flush(png_structrp png_ptr)
857
910
{
858
int wrote_IDAT;
859
860
911
png_debug(1, "in png_write_flush");
861
912
862
913
if (png_ptr == NULL)
863
914
return;
915
864
916
/* We have already written out all of the data */
865
917
if (png_ptr->row_number >= png_ptr->num_rows)
866
918
return;
867
919
868
do
869
{
870
int ret;
871
872
/* Compress the data */
873
ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
874
wrote_IDAT = 0;
875
876
/* Check for compression errors */
877
if (ret != Z_OK)
878
{
879
if (png_ptr->zstream.msg != NULL)
880
png_error(png_ptr, png_ptr->zstream.msg);
881
else
882
png_error(png_ptr, "zlib error");
883
}
884
885
if (!(png_ptr->zstream.avail_out))
886
{
887
/* Write the IDAT and reset the zlib output buffer */
888
png_write_IDAT(png_ptr, png_ptr->zbuf,
889
png_ptr->zbuf_size);
890
png_ptr->zstream.next_out = png_ptr->zbuf;
891
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
892
wrote_IDAT = 1;
893
}
894
} while(wrote_IDAT == 1);
895
896
/* If there is any data left to be output, write it into a new IDAT */
897
if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
898
{
899
/* Write the IDAT and reset the zlib output buffer */
900
png_write_IDAT(png_ptr, png_ptr->zbuf,
901
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
902
png_ptr->zstream.next_out = png_ptr->zbuf;
903
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
904
}
920
png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH);
905
921
png_ptr->flush_rows = 0;
906
922
png_flush(png_ptr);
907
923
}
908
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
909
910
/* Free all memory used by the write */
911
void PNGAPI
912
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
913
{
914
png_structp png_ptr = NULL;
915
png_infop info_ptr = NULL;
916
#ifdef PNG_USER_MEM_SUPPORTED
917
png_free_ptr free_fn = NULL;
918
png_voidp mem_ptr = NULL;
919
#endif
920
921
png_debug(1, "in png_destroy_write_struct");
922
923
if (png_ptr_ptr != NULL)
924
{
925
png_ptr = *png_ptr_ptr;
926
#ifdef PNG_USER_MEM_SUPPORTED
927
free_fn = png_ptr->free_fn;
928
mem_ptr = png_ptr->mem_ptr;
929
#endif
930
}
931
932
#ifdef PNG_USER_MEM_SUPPORTED
933
if (png_ptr != NULL)
934
{
935
free_fn = png_ptr->free_fn;
936
mem_ptr = png_ptr->mem_ptr;
937
}
938
#endif
939
940
if (info_ptr_ptr != NULL)
941
info_ptr = *info_ptr_ptr;
942
943
if (info_ptr != NULL)
944
{
945
if (png_ptr != NULL)
946
{
947
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
948
949
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
950
if (png_ptr->num_chunk_list)
951
{
952
png_free(png_ptr, png_ptr->chunk_list);
953
png_ptr->num_chunk_list = 0;
954
}
955
#endif
956
}
957
958
#ifdef PNG_USER_MEM_SUPPORTED
959
png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
960
(png_voidp)mem_ptr);
961
#else
962
png_destroy_struct((png_voidp)info_ptr);
963
#endif
964
*info_ptr_ptr = NULL;
965
}
966
967
if (png_ptr != NULL)
968
{
969
png_write_destroy(png_ptr);
970
#ifdef PNG_USER_MEM_SUPPORTED
971
png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
972
(png_voidp)mem_ptr);
973
#else
974
png_destroy_struct((png_voidp)png_ptr);
975
#endif
976
*png_ptr_ptr = NULL;
977
}
978
}
979
980
981
/* Free any memory used in png_ptr struct (old method) */
982
void /* PRIVATE */
983
png_write_destroy(png_structp png_ptr)
984
{
985
#ifdef PNG_SETJMP_SUPPORTED
986
jmp_buf tmp_jmp; /* Save jump buffer */
987
#endif
988
png_error_ptr error_fn;
989
png_error_ptr warning_fn;
990
png_voidp error_ptr;
991
#ifdef PNG_USER_MEM_SUPPORTED
992
png_free_ptr free_fn;
993
#endif
994
924
#endif /* WRITE_FLUSH */
925
926
/* Free any memory used in png_ptr struct without freeing the struct itself. */
927
static void
928
png_write_destroy(png_structrp png_ptr)
929
{
995
930
png_debug(1, "in png_write_destroy");
996
931
997
932
/* Free any memory zlib uses */
998
deflateEnd(&png_ptr->zstream);
933
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
934
deflateEnd(&png_ptr->zstream);
999
935
1000
936
/* Free our memory. png_free checks NULL for us. */
1001
png_free(png_ptr, png_ptr->zbuf);
937
png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1002
938
png_free(png_ptr, png_ptr->row_buf);
939
png_ptr->row_buf = NULL;
1003
940
#ifdef PNG_WRITE_FILTER_SUPPORTED
1004
941
png_free(png_ptr, png_ptr->prev_row);
1005
png_free(png_ptr, png_ptr->sub_row);
1006
png_free(png_ptr, png_ptr->up_row);
1007
png_free(png_ptr, png_ptr->avg_row);
1008
png_free(png_ptr, png_ptr->paeth_row);
1009
#endif
1010
1011
#ifdef PNG_TIME_RFC1123_SUPPORTED
1012
png_free(png_ptr, png_ptr->time_buffer);
1013
#endif
1014
1015
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1016
png_free(png_ptr, png_ptr->prev_filters);
1017
png_free(png_ptr, png_ptr->filter_weights);
1018
png_free(png_ptr, png_ptr->inv_filter_weights);
1019
png_free(png_ptr, png_ptr->filter_costs);
1020
png_free(png_ptr, png_ptr->inv_filter_costs);
1021
#endif
1022
1023
#ifdef PNG_SETJMP_SUPPORTED
1024
/* Reset structure */
1025
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
1026
#endif
1027
1028
error_fn = png_ptr->error_fn;
1029
warning_fn = png_ptr->warning_fn;
1030
error_ptr = png_ptr->error_ptr;
1031
#ifdef PNG_USER_MEM_SUPPORTED
1032
free_fn = png_ptr->free_fn;
1033
#endif
1034
1035
png_memset(png_ptr, 0, png_sizeof(png_struct));
1036
1037
png_ptr->error_fn = error_fn;
1038
png_ptr->warning_fn = warning_fn;
1039
png_ptr->error_ptr = error_ptr;
1040
#ifdef PNG_USER_MEM_SUPPORTED
1041
png_ptr->free_fn = free_fn;
1042
#endif
1043
1044
#ifdef PNG_SETJMP_SUPPORTED
1045
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1046
#endif
942
png_free(png_ptr, png_ptr->try_row);
943
png_free(png_ptr, png_ptr->tst_row);
944
png_ptr->prev_row = NULL;
945
png_ptr->try_row = NULL;
946
png_ptr->tst_row = NULL;
947
#endif
948
949
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
950
png_free(png_ptr, png_ptr->chunk_list);
951
png_ptr->chunk_list = NULL;
952
#endif
953
954
/* The error handling and memory handling information is left intact at this
955
* point: the jmp_buf may still have to be freed. See png_destroy_png_struct
956
* for how this happens.
957
*/
958
}
959
960
/* Free all memory used by the write.
961
* In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for
962
* *png_ptr_ptr. Prior to 1.6.0 it would accept such a value and it would free
963
* the passed in info_structs but it would quietly fail to free any of the data
964
* inside them. In 1.6.0 it quietly does nothing (it has to be quiet because it
965
* has no png_ptr.)
966
*/
967
void PNGAPI
968
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
969
{
970
png_debug(1, "in png_destroy_write_struct");
971
972
if (png_ptr_ptr != NULL)
973
{
974
png_structrp png_ptr = *png_ptr_ptr;
975
976
if (png_ptr != NULL) /* added in libpng 1.6.0 */
977
{
978
png_destroy_info_struct(png_ptr, info_ptr_ptr);
979
980
*png_ptr_ptr = NULL;
981
png_write_destroy(png_ptr);
982
png_destroy_png_struct(png_ptr);
983
}
984
}
1047
985
}
1048
986
1049
987
/* Allow the application to select one or more row filters to use. */
1050
988
void PNGAPI
1051
png_set_filter(png_structp png_ptr, int method, int filters)
989
png_set_filter(png_structrp png_ptr, int method, int filters)
1052
990
{
1053
991
png_debug(1, "in png_set_filter");
1054
992
1055
993
if (png_ptr == NULL)
1056
994
return;
995
1057
996
#ifdef PNG_MNG_FEATURES_SUPPORTED
1058
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
1059
(method == PNG_INTRAPIXEL_DIFFERENCING))
1060
method = PNG_FILTER_TYPE_BASE;
997
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
998
(method == PNG_INTRAPIXEL_DIFFERENCING))
999
method = PNG_FILTER_TYPE_BASE;
1000
1061
1001
#endif
1062
1002
if (method == PNG_FILTER_TYPE_BASE)
1063
1003
{
1064
1004
switch (filters & (PNG_ALL_FILTERS | 0x07))
1065
1005
{
1006
#ifdef PNG_WRITE_FILTER_SUPPORTED
1007
case 5:
1008
case 6:
1009
case 7: png_app_error(png_ptr, "Unknown row filter for method 0");
1010
/* FALL THROUGH */
1011
#endif /* WRITE_FILTER */
1066
1012
case PNG_FILTER_VALUE_NONE:
1067
png_ptr->do_filter = PNG_FILTER_NONE; break;
1013
png_ptr->do_filter = PNG_FILTER_NONE; break;
1014
1068
1015
#ifdef PNG_WRITE_FILTER_SUPPORTED
1069
case 5:
1070
case 6:
1071
case 7: png_warning(png_ptr, "Unknown row filter for method 0");
1072
break;
1073
1016
case PNG_FILTER_VALUE_SUB:
1074
png_ptr->do_filter = PNG_FILTER_SUB; break;
1017
png_ptr->do_filter = PNG_FILTER_SUB; break;
1018
1075
1019
case PNG_FILTER_VALUE_UP:
1076
png_ptr->do_filter = PNG_FILTER_UP; break;
1020
png_ptr->do_filter = PNG_FILTER_UP; break;
1021
1077
1022
case PNG_FILTER_VALUE_AVG:
1078
png_ptr->do_filter = PNG_FILTER_AVG; break;
1023
png_ptr->do_filter = PNG_FILTER_AVG; break;
1024
1079
1025
case PNG_FILTER_VALUE_PAETH:
1080
png_ptr->do_filter = PNG_FILTER_PAETH; break;
1081
default: png_ptr->do_filter = (png_byte)filters; break;
1026
png_ptr->do_filter = PNG_FILTER_PAETH; break;
1027
1028
default:
1029
png_ptr->do_filter = (png_byte)filters; break;
1082
1030
#else
1083
default: png_warning(png_ptr, "Unknown row filter for method 0");
1084
break;
1085
#endif /* PNG_WRITE_FILTER_SUPPORTED */
1031
default:
1032
png_app_error(png_ptr, "Unknown row filter for method 0");
1033
#endif /* WRITE_FILTER */
1086
1034
}
1087
1035
1036
#ifdef PNG_WRITE_FILTER_SUPPORTED
1088
1037
/* If we have allocated the row_buf, this means we have already started
1089
1038
* with the image and we should have allocated all of the filter buffers
1090
1039
* that have been selected. If prev_row isn't already allocated, then
1091
1040
* it is too late to start using the filters that need it, since we
1092
1041
* will be missing the data in the previous row. If an application
1093
1042
* wants to start and stop using particular filters during compression,
1094
* it should start out with all of the filters, and then add and
1095
* remove them after the start of compression.
1043
* it should start out with all of the filters, and then remove them
1044
* or add them back after the start of compression.
1045
*
1046
* NOTE: this is a nasty constraint on the code, because it means that the
1047
* prev_row buffer must be maintained even if there are currently no
1048
* 'prev_row' requiring filters active.
1096
1049
*/
1097
1050
if (png_ptr->row_buf != NULL)
1098
1051
{
1099
#ifdef PNG_WRITE_FILTER_SUPPORTED
1100
if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
1101
{
1102
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
1103
(png_ptr->rowbytes + 1));
1104
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
1105
}
1106
1107
if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
1108
{
1109
if (png_ptr->prev_row == NULL)
1110
{
1111
png_warning(png_ptr, "Can't add Up filter after starting");
1112
png_ptr->do_filter &= ~PNG_FILTER_UP;
1113
}
1114
else
1115
{
1116
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
1117
(png_ptr->rowbytes + 1));
1118
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
1119
}
1120
}
1121
1122
if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
1123
{
1124
if (png_ptr->prev_row == NULL)
1125
{
1126
png_warning(png_ptr, "Can't add Average filter after starting");
1127
png_ptr->do_filter &= ~PNG_FILTER_AVG;
1128
}
1129
else
1130
{
1131
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
1132
(png_ptr->rowbytes + 1));
1133
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
1134
}
1135
}
1136
1137
if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
1138
png_ptr->paeth_row == NULL)
1139
{
1140
if (png_ptr->prev_row == NULL)
1141
{
1142
png_warning(png_ptr, "Can't add Paeth filter after starting");
1143
png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
1144
}
1145
else
1146
{
1147
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
1148
(png_ptr->rowbytes + 1));
1149
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
1150
}
1151
}
1152
1153
if (png_ptr->do_filter == PNG_NO_FILTERS)
1154
#endif /* PNG_WRITE_FILTER_SUPPORTED */
1155
png_ptr->do_filter = PNG_FILTER_NONE;
1052
int num_filters;
1053
png_alloc_size_t buf_size;
1054
1055
/* Repeat the checks in png_write_start_row; 1 pixel high or wide
1056
* images cannot benefit from certain filters. If this isn't done here
1057
* the check below will fire on 1 pixel high images.
1058
*/
1059
if (png_ptr->height == 1)
1060
filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
1061
1062
if (png_ptr->width == 1)
1063
filters &= ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH);
1064
1065
if ((filters & (PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH)) != 0
1066
&& png_ptr->prev_row == NULL)
1067
{
1068
/* This is the error case, however it is benign - the previous row
1069
* is not available so the filter can't be used. Just warn here.
1070
*/
1071
png_app_warning(png_ptr,
1072
"png_set_filter: UP/AVG/PAETH cannot be added after start");
1073
filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
1074
}
1075
1076
num_filters = 0;
1077
1078
if (filters & PNG_FILTER_SUB)
1079
num_filters++;
1080
1081
if (filters & PNG_FILTER_UP)
1082
num_filters++;
1083
1084
if (filters & PNG_FILTER_AVG)
1085
num_filters++;
1086
1087
if (filters & PNG_FILTER_PAETH)
1088
num_filters++;
1089
1090
/* Allocate needed row buffers if they have not already been
1091
* allocated.
1092
*/
1093
buf_size = PNG_ROWBYTES(png_ptr->usr_channels * png_ptr->usr_bit_depth,
1094
png_ptr->width) + 1;
1095
1096
if (png_ptr->try_row == NULL)
1097
png_ptr->try_row = png_voidcast(png_bytep,
1098
png_malloc(png_ptr, buf_size));
1099
1100
if (num_filters > 1)
1101
{
1102
if (png_ptr->tst_row == NULL)
1103
png_ptr->tst_row = png_voidcast(png_bytep,
1104
png_malloc(png_ptr, buf_size));
1105
}
1156
1106
}
1107
png_ptr->do_filter = (png_byte)filters;
1108
#endif
1157
1109
}
1158
1110
else
1159
1111
png_error(png_ptr, "Unknown custom filter method");
1160
1112
}
1161
1113
1162
/* This allows us to influence the way in which libpng chooses the "best"
1163
* filter for the current scanline. While the "minimum-sum-of-absolute-
1164
* differences metric is relatively fast and effective, there is some
1165
* question as to whether it can be improved upon by trying to keep the
1166
* filtered data going to zlib more consistent, hopefully resulting in
1167
* better compression.
1168
*/
1169
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
1170
void PNGAPI
1171
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
1172
int num_weights, png_doublep filter_weights,
1173
png_doublep filter_costs)
1174
{
1175
int i;
1176
1177
png_debug(1, "in png_set_filter_heuristics");
1178
1179
if (png_ptr == NULL)
1180
return;
1181
if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
1182
{
1183
png_warning(png_ptr, "Unknown filter heuristic method");
1184
return;
1185
}
1186
1187
if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
1188
{
1189
heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
1190
}
1191
1192
if (num_weights < 0 || filter_weights == NULL ||
1193
heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
1194
{
1195
num_weights = 0;
1196
}
1197
1198
png_ptr->num_prev_filters = (png_byte)num_weights;
1199
png_ptr->heuristic_method = (png_byte)heuristic_method;
1200
1201
if (num_weights > 0)
1202
{
1203
if (png_ptr->prev_filters == NULL)
1204
{
1205
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
1206
(png_uint_32)(png_sizeof(png_byte) * num_weights));
1207
1208
/* To make sure that the weighting starts out fairly */
1209
for (i = 0; i < num_weights; i++)
1210
{
1211
png_ptr->prev_filters[i] = 255;
1212
}
1213
}
1214
1215
if (png_ptr->filter_weights == NULL)
1216
{
1217
png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
1218
(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1219
1220
png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
1221
(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1222
for (i = 0; i < num_weights; i++)
1223
{
1224
png_ptr->inv_filter_weights[i] =
1225
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1226
}
1227
}
1228
1229
for (i = 0; i < num_weights; i++)
1230
{
1231
if (filter_weights[i] < 0.0)
1232
{
1233
png_ptr->inv_filter_weights[i] =
1234
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1235
}
1236
else
1237
{
1238
png_ptr->inv_filter_weights[i] =
1239
(png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
1240
png_ptr->filter_weights[i] =
1241
(png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
1242
}
1243
}
1244
}
1245
1246
/* If, in the future, there are other filter methods, this would
1247
* need to be based on png_ptr->filter.
1248
*/
1249
if (png_ptr->filter_costs == NULL)
1250
{
1251
png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
1252
(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1253
1254
png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
1255
(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1256
1257
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1258
{
1259
png_ptr->inv_filter_costs[i] =
1260
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
1261
}
1262
}
1263
1264
/* Here is where we set the relative costs of the different filters. We
1265
* should take the desired compression level into account when setting
1266
* the costs, so that Paeth, for instance, has a high relative cost at low
1267
* compression levels, while it has a lower relative cost at higher
1268
* compression settings. The filter types are in order of increasing
1269
* relative cost, so it would be possible to do this with an algorithm.
1270
*/
1271
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1272
{
1273
if (filter_costs == NULL || filter_costs[i] < 0.0)
1274
{
1275
png_ptr->inv_filter_costs[i] =
1276
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
1277
}
1278
else if (filter_costs[i] >= 1.0)
1279
{
1280
png_ptr->inv_filter_costs[i] =
1281
(png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
1282
png_ptr->filter_costs[i] =
1283
(png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
1284
}
1285
}
1286
}
1287
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1288
1289
void PNGAPI
1290
png_set_compression_level(png_structp png_ptr, int level)
1114
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
1115
/* Provide floating and fixed point APIs */
1116
#ifdef PNG_FLOATING_POINT_SUPPORTED
1117
void PNGAPI
1118
png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method,
1119
int num_weights, png_const_doublep filter_weights,
1120
png_const_doublep filter_costs)
1121
{
1122
PNG_UNUSED(png_ptr)
1123
PNG_UNUSED(heuristic_method)
1124
PNG_UNUSED(num_weights)
1125
PNG_UNUSED(filter_weights)
1126
PNG_UNUSED(filter_costs)
1127
}
1128
#endif /* FLOATING_POINT */
1129
1130
#ifdef PNG_FIXED_POINT_SUPPORTED
1131
void PNGAPI
1132
png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method,
1133
int num_weights, png_const_fixed_point_p filter_weights,
1134
png_const_fixed_point_p filter_costs)
1135
{
1136
PNG_UNUSED(png_ptr)
1137
PNG_UNUSED(heuristic_method)
1138
PNG_UNUSED(num_weights)
1139
PNG_UNUSED(filter_weights)
1140
PNG_UNUSED(filter_costs)
1141
}
1142
#endif /* FIXED_POINT */
1143
#endif /* WRITE_WEIGHTED_FILTER */
1144
1145
#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
1146
void PNGAPI
1147
png_set_compression_level(png_structrp png_ptr, int level)
1291
1148
{
1292
1149
png_debug(1, "in png_set_compression_level");
1293
1150
1294
1151
if (png_ptr == NULL)
1295
1152
return;
1296
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
1153
1297
1154
png_ptr->zlib_level = level;
1298
1155
}
1299
1156
1300
1157
void PNGAPI
1301
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
1158
png_set_compression_mem_level(png_structrp png_ptr, int mem_level)
1302
1159
{
1303
1160
png_debug(1, "in png_set_compression_mem_level");
1304
1161
1305
1162
if (png_ptr == NULL)
1306
1163
return;
1307
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
1164
1308
1165
png_ptr->zlib_mem_level = mem_level;
1309
1166
}
1310
1167
1311
1168
void PNGAPI
1312
png_set_compression_strategy(png_structp png_ptr, int strategy)
1169
png_set_compression_strategy(png_structrp png_ptr, int strategy)
1313
1170
{
1314
1171
png_debug(1, "in png_set_compression_strategy");
1315
1172
1316
1173
if (png_ptr == NULL)
1317
1174
return;
1175
1176
/* The flag setting here prevents the libpng dynamic selection of strategy.
1177
*/
1318
1178
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
1319
1179
png_ptr->zlib_strategy = strategy;
1320
1180
}
1321
1181
1182
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
1183
* smaller value of window_bits if it can do so safely.
1184
*/
1322
1185
void PNGAPI
1323
png_set_compression_window_bits(png_structp png_ptr, int window_bits)
1186
png_set_compression_window_bits(png_structrp png_ptr, int window_bits)
1324
1187
{
1325
1188
if (png_ptr == NULL)
1326
1189
return;
1190
1191
/* Prior to 1.6.0 this would warn but then set the window_bits value. This
1192
* meant that negative window bits values could be selected that would cause
1193
* libpng to write a non-standard PNG file with raw deflate or gzip
1194
* compressed IDAT or ancillary chunks. Such files can be read and there is
1195
* no warning on read, so this seems like a very bad idea.
1196
*/
1327
1197
if (window_bits > 15)
1198
{
1328
1199
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1200
window_bits = 15;
1201
}
1202
1329
1203
else if (window_bits < 8)
1204
{
1330
1205
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1331
#ifndef WBITS_8_OK
1332
/* Avoid libpng bug with 256-byte windows */
1333
if (window_bits == 8)
1334
{
1335
png_warning(png_ptr, "Compression window is being reset to 512");
1336
window_bits = 9;
1337
}
1338
#endif
1339
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
1206
window_bits = 8;
1207
}
1208
1340
1209
png_ptr->zlib_window_bits = window_bits;
1341
1210
}
1342
1211
1343
1212
void PNGAPI
1344
png_set_compression_method(png_structp png_ptr, int method)
1213
png_set_compression_method(png_structrp png_ptr, int method)
1345
1214
{
1346
1215
png_debug(1, "in png_set_compression_method");
1347
1216
1348
1217
if (png_ptr == NULL)
1349
1218
return;
1219
1220
/* This would produce an invalid PNG file if it worked, but it doesn't and
1221
* deflate will fault it, so it is harmless to just warn here.
1222
*/
1350
1223
if (method != 8)
1351
1224
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
1352
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
1225
1353
1226
png_ptr->zlib_method = method;
1354
1227
}
1355
1356
void PNGAPI
1357
png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
1358
{
1359
if (png_ptr == NULL)
1360
return;
1228
#endif /* WRITE_CUSTOMIZE_COMPRESSION */
1229
1230
/* The following were added to libpng-1.5.4 */
1231
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
1232
void PNGAPI
1233
png_set_text_compression_level(png_structrp png_ptr, int level)
1234
{
1235
png_debug(1, "in png_set_text_compression_level");
1236
1237
if (png_ptr == NULL)
1238
return;
1239
1240
png_ptr->zlib_text_level = level;
1241
}
1242
1243
void PNGAPI
1244
png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level)
1245
{
1246
png_debug(1, "in png_set_text_compression_mem_level");
1247
1248
if (png_ptr == NULL)
1249
return;
1250
1251
png_ptr->zlib_text_mem_level = mem_level;
1252
}
1253
1254
void PNGAPI
1255
png_set_text_compression_strategy(png_structrp png_ptr, int strategy)
1256
{
1257
png_debug(1, "in png_set_text_compression_strategy");
1258
1259
if (png_ptr == NULL)
1260
return;
1261
1262
png_ptr->zlib_text_strategy = strategy;
1263
}
1264
1265
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
1266
* smaller value of window_bits if it can do so safely.
1267
*/
1268
void PNGAPI
1269
png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits)
1270
{
1271
if (png_ptr == NULL)
1272
return;
1273
1274
if (window_bits > 15)
1275
{
1276
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1277
window_bits = 15;
1278
}
1279
1280
else if (window_bits < 8)
1281
{
1282
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1283
window_bits = 8;
1284
}
1285
1286
png_ptr->zlib_text_window_bits = window_bits;
1287
}
1288
1289
void PNGAPI
1290
png_set_text_compression_method(png_structrp png_ptr, int method)
1291
{
1292
png_debug(1, "in png_set_text_compression_method");
1293
1294
if (png_ptr == NULL)
1295
return;
1296
1297
if (method != 8)
1298
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
1299
1300
png_ptr->zlib_text_method = method;
1301
}
1302
#endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
1303
/* end of API added to libpng-1.5.4 */
1304
1305
void PNGAPI
1306
png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn)
1307
{
1308
if (png_ptr == NULL)
1309
return;
1310
1361
1311
png_ptr->write_row_fn = write_row_fn;
1362
1312
}
1363
1313
1364
1314
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1365
1315
void PNGAPI
1366
png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
1367
write_user_transform_fn)
1316
png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr
1317
write_user_transform_fn)
1368
1318
{
1369
1319
png_debug(1, "in png_set_write_user_transform_fn");
1370
1320
1371
1321
if (png_ptr == NULL)
1372
1322
return;
1323
1373
1324
png_ptr->transformations |= PNG_USER_TRANSFORM;
1374
1325
png_ptr->write_user_transform_fn = write_user_transform_fn;
1375
1326
}
1378
1329
1379
1330
#ifdef PNG_INFO_IMAGE_SUPPORTED
1380
1331
void PNGAPI
1381
png_write_png(png_structp png_ptr, png_infop info_ptr,
1382
int transforms, voidp params)
1332
png_write_png(png_structrp png_ptr, png_inforp info_ptr,
1333
int transforms, voidp params)
1383
1334
{
1384
1335
if (png_ptr == NULL || info_ptr == NULL)
1385
1336
return;
1386
1337
1338
if ((info_ptr->valid & PNG_INFO_IDAT) == 0)
1339
{
1340
png_app_error(png_ptr, "no rows for png_write_image to write");
1341
return;
1342
}
1343
1387
1344
/* Write the file header information. */
1388
1345
png_write_info(png_ptr, info_ptr);
1389
1346
1390
1347
/* ------ these transformations don't touch the info structure ------- */
1391
1348
1349
/* Invert monochrome pixels */
1350
if ((transforms & PNG_TRANSFORM_INVERT_MONO) != 0)
1392
1351
#ifdef PNG_WRITE_INVERT_SUPPORTED
1393
/* Invert monochrome pixels */
1394
if (transforms & PNG_TRANSFORM_INVERT_MONO)
1395
1352
png_set_invert_mono(png_ptr);
1353
#else
1354
png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported");
1396
1355
#endif
1397
1356
1398
#ifdef PNG_WRITE_SHIFT_SUPPORTED
1399
1357
/* Shift the pixels up to a legal bit depth and fill in
1400
1358
* as appropriate to correctly scale the image.
1401
1359
*/
1402
if ((transforms & PNG_TRANSFORM_SHIFT)
1403
&& (info_ptr->valid & PNG_INFO_sBIT))
1404
png_set_shift(png_ptr, &info_ptr->sig_bit);
1360
if ((transforms & PNG_TRANSFORM_SHIFT) != 0)
1361
#ifdef PNG_WRITE_SHIFT_SUPPORTED
1362
if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
1363
png_set_shift(png_ptr, &info_ptr->sig_bit);
1364
#else
1365
png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported");
1405
1366
#endif
1406
1367
1368
/* Pack pixels into bytes */
1369
if ((transforms & PNG_TRANSFORM_PACKING) != 0)
1407
1370
#ifdef PNG_WRITE_PACK_SUPPORTED
1408
/* Pack pixels into bytes */
1409
if (transforms & PNG_TRANSFORM_PACKING)
1410
png_set_packing(png_ptr);
1371
png_set_packing(png_ptr);
1372
#else
1373
png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported");
1411
1374
#endif
1412
1375
1376
/* Swap location of alpha bytes from ARGB to RGBA */
1377
if ((transforms & PNG_TRANSFORM_SWAP_ALPHA) != 0)
1413
1378
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1414
/* Swap location of alpha bytes from ARGB to RGBA */
1415
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1416
1379
png_set_swap_alpha(png_ptr);
1380
#else
1381
png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported");
1417
1382
#endif
1418
1383
1384
/* Remove a filler (X) from XRGB/RGBX/AG/GA into to convert it into
1385
* RGB, note that the code expects the input color type to be G or RGB; no
1386
* alpha channel.
1387
*/
1388
if ((transforms & (PNG_TRANSFORM_STRIP_FILLER_AFTER|
1389
PNG_TRANSFORM_STRIP_FILLER_BEFORE)) != 0)
1390
{
1419
1391
#ifdef PNG_WRITE_FILLER_SUPPORTED
1420
/* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */
1421
if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
1422
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
1423
else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
1424
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
1392
if ((transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) != 0)
1393
{
1394
if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
1395
png_app_error(png_ptr,
1396
"PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported");
1397
1398
/* Continue if ignored - this is the pre-1.6.10 behavior */
1399
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
1400
}
1401
1402
else if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
1403
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
1404
#else
1405
png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_FILLER not supported");
1425
1406
#endif
1407
}
1426
1408
1409
/* Flip BGR pixels to RGB */
1410
if ((transforms & PNG_TRANSFORM_BGR) != 0)
1427
1411
#ifdef PNG_WRITE_BGR_SUPPORTED
1428
/* Flip BGR pixels to RGB */
1429
if (transforms & PNG_TRANSFORM_BGR)
1430
1412
png_set_bgr(png_ptr);
1413
#else
1414
png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported");
1431
1415
#endif
1432
1416
1417
/* Swap bytes of 16-bit files to most significant byte first */
1418
if ((transforms & PNG_TRANSFORM_SWAP_ENDIAN) != 0)
1433
1419
#ifdef PNG_WRITE_SWAP_SUPPORTED
1434
/* Swap bytes of 16-bit files to most significant byte first */
1435
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1436
1420
png_set_swap(png_ptr);
1421
#else
1422
png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported");
1437
1423
#endif
1438
1424
1425
/* Swap bits of 1, 2, 4 bit packed pixel formats */
1426
if ((transforms & PNG_TRANSFORM_PACKSWAP) != 0)
1439
1427
#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
1440
/* Swap bits of 1, 2, 4 bit packed pixel formats */
1441
if (transforms & PNG_TRANSFORM_PACKSWAP)
1442
1428
png_set_packswap(png_ptr);
1429
#else
1430
png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported");
1443
1431
#endif
1444
1432
1445
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1446
1433
/* Invert the alpha channel from opacity to transparency */
1447
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1434
if ((transforms & PNG_TRANSFORM_INVERT_ALPHA) != 0)
1435
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1448
1436
png_set_invert_alpha(png_ptr);
1437
#else
1438
png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported");
1449
1439
#endif
1450
1440
1451
1441
/* ----------------------- end of transformations ------------------- */
1452
1442
1453
1443
/* Write the bits */
1454
if (info_ptr->valid & PNG_INFO_IDAT)
1455
png_write_image(png_ptr, info_ptr->row_pointers);
1444
png_write_image(png_ptr, info_ptr->row_pointers);
1456
1445
1457
1446
/* It is REQUIRED to call this to finish writing the rest of the file */
1458
1447
png_write_end(png_ptr, info_ptr);
1459
1448
1460
PNG_UNUSED(transforms) /* Quiet compiler warnings */
1461
1449
PNG_UNUSED(params)
1462
1450
}
1463
1451
#endif
1464
#endif /* PNG_WRITE_SUPPORTED */
1452
1453
1454
#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
1455
# ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */
1456
/* Initialize the write structure - general purpose utility. */
1457
static int
1458
png_image_write_init(png_imagep image)
1459
{
1460
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image,
1461
png_safe_error, png_safe_warning);
1462
1463
if (png_ptr != NULL)
1464
{
1465
png_infop info_ptr = png_create_info_struct(png_ptr);
1466
1467
if (info_ptr != NULL)
1468
{
1469
png_controlp control = png_voidcast(png_controlp,
1470
png_malloc_warn(png_ptr, (sizeof *control)));
1471
1472
if (control != NULL)
1473
{
1474
memset(control, 0, (sizeof *control));
1475
1476
control->png_ptr = png_ptr;
1477
control->info_ptr = info_ptr;
1478
control->for_write = 1;
1479
1480
image->opaque = control;
1481
return 1;
1482
}
1483
1484
/* Error clean up */
1485
png_destroy_info_struct(png_ptr, &info_ptr);
1486
}
1487
1488
png_destroy_write_struct(&png_ptr, NULL);
1489
}
1490
1491
return png_image_error(image, "png_image_write_: out of memory");
1492
}
1493
1494
/* Arguments to png_image_write_main: */
1495
typedef struct
1496
{
1497
/* Arguments: */
1498
png_imagep image;
1499
png_const_voidp buffer;
1500
png_int_32 row_stride;
1501
png_const_voidp colormap;
1502
int convert_to_8bit;
1503
/* Local variables: */
1504
png_const_voidp first_row;
1505
ptrdiff_t row_bytes;
1506
png_voidp local_row;
1507
} png_image_write_control;
1508
1509
/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to
1510
* do any necessary byte swapping. The component order is defined by the
1511
* png_image format value.
1512
*/
1513
static int
1514
png_write_image_16bit(png_voidp argument)
1515
{
1516
png_image_write_control *display = png_voidcast(png_image_write_control*,
1517
argument);
1518
png_imagep image = display->image;
1519
png_structrp png_ptr = image->opaque->png_ptr;
1520
1521
png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
1522
display->first_row);
1523
png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row);
1524
png_uint_16p row_end;
1525
const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
1526
int aindex = 0;
1527
png_uint_32 y = image->height;
1528
1529
if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
1530
{
1531
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
1532
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
1533
{
1534
aindex = -1;
1535
++input_row; /* To point to the first component */
1536
++output_row;
1537
}
1538
else
1539
aindex = channels;
1540
# else
1541
aindex = channels;
1542
# endif
1543
}
1544
1545
else
1546
png_error(png_ptr, "png_write_image: internal call error");
1547
1548
/* Work out the output row end and count over this, note that the increment
1549
* above to 'row' means that row_end can actually be beyond the end of the
1550
* row; this is correct.
1551
*/
1552
row_end = output_row + image->width * (channels+1);
1553
1554
while (y-- > 0)
1555
{
1556
png_const_uint_16p in_ptr = input_row;
1557
png_uint_16p out_ptr = output_row;
1558
1559
while (out_ptr < row_end)
1560
{
1561
const png_uint_16 alpha = in_ptr[aindex];
1562
png_uint_32 reciprocal = 0;
1563
int c;
1564
1565
out_ptr[aindex] = alpha;
1566
1567
/* Calculate a reciprocal. The correct calculation is simply
1568
* component/alpha*65535 << 15. (I.e. 15 bits of precision); this
1569
* allows correct rounding by adding .5 before the shift. 'reciprocal'
1570
* is only initialized when required.
1571
*/
1572
if (alpha > 0 && alpha < 65535)
1573
reciprocal = ((0xffff<<15)+(alpha>>1))/alpha;
1574
1575
c = channels;
1576
do /* always at least one channel */
1577
{
1578
png_uint_16 component = *in_ptr++;
1579
1580
/* The following gives 65535 for an alpha of 0, which is fine,
1581
* otherwise if 0/0 is represented as some other value there is more
1582
* likely to be a discontinuity which will probably damage
1583
* compression when moving from a fully transparent area to a
1584
* nearly transparent one. (The assumption here is that opaque
1585
* areas tend not to be 0 intensity.)
1586
*/
1587
if (component >= alpha)
1588
component = 65535;
1589
1590
/* component<alpha, so component/alpha is less than one and
1591
* component*reciprocal is less than 2^31.
1592
*/
1593
else if (component > 0 && alpha < 65535)
1594
{
1595
png_uint_32 calc = component * reciprocal;
1596
calc += 16384; /* round to nearest */
1597
component = (png_uint_16)(calc >> 15);
1598
}
1599
1600
*out_ptr++ = component;
1601
}
1602
while (--c > 0);
1603
1604
/* Skip to next component (skip the intervening alpha channel) */
1605
++in_ptr;
1606
++out_ptr;
1607
}
1608
1609
png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row));
1610
input_row += display->row_bytes/(sizeof (png_uint_16));
1611
}
1612
1613
return 1;
1614
}
1615
1616
/* Given 16-bit input (1 to 4 channels) write 8-bit output. If an alpha channel
1617
* is present it must be removed from the components, the components are then
1618
* written in sRGB encoding. No components are added or removed.
1619
*
1620
* Calculate an alpha reciprocal to reverse pre-multiplication. As above the
1621
* calculation can be done to 15 bits of accuracy; however, the output needs to
1622
* be scaled in the range 0..255*65535, so include that scaling here.
1623
*/
1624
# define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
1625
1626
static png_byte
1627
png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
1628
png_uint_32 reciprocal/*from the above macro*/)
1629
{
1630
/* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0
1631
* is represented as some other value there is more likely to be a
1632
* discontinuity which will probably damage compression when moving from a
1633
* fully transparent area to a nearly transparent one. (The assumption here
1634
* is that opaque areas tend not to be 0 intensity.)
1635
*
1636
* There is a rounding problem here; if alpha is less than 128 it will end up
1637
* as 0 when scaled to 8 bits. To avoid introducing spurious colors into the
1638
* output change for this too.
1639
*/
1640
if (component >= alpha || alpha < 128)
1641
return 255;
1642
1643
/* component<alpha, so component/alpha is less than one and
1644
* component*reciprocal is less than 2^31.
1645
*/
1646
else if (component > 0)
1647
{
1648
/* The test is that alpha/257 (rounded) is less than 255, the first value
1649
* that becomes 255 is 65407.
1650
* NOTE: this must agree with the PNG_DIV257 macro (which must, therefore,
1651
* be exact!) [Could also test reciprocal != 0]
1652
*/
1653
if (alpha < 65407)
1654
{
1655
component *= reciprocal;
1656
component += 64; /* round to nearest */
1657
component >>= 7;
1658
}
1659
1660
else
1661
component *= 255;
1662
1663
/* Convert the component to sRGB. */
1664
return (png_byte)PNG_sRGB_FROM_LINEAR(component);
1665
}
1666
1667
else
1668
return 0;
1669
}
1670
1671
static int
1672
png_write_image_8bit(png_voidp argument)
1673
{
1674
png_image_write_control *display = png_voidcast(png_image_write_control*,
1675
argument);
1676
png_imagep image = display->image;
1677
png_structrp png_ptr = image->opaque->png_ptr;
1678
1679
png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
1680
display->first_row);
1681
png_bytep output_row = png_voidcast(png_bytep, display->local_row);
1682
png_uint_32 y = image->height;
1683
const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
1684
1685
if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
1686
{
1687
png_bytep row_end;
1688
int aindex;
1689
1690
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
1691
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
1692
{
1693
aindex = -1;
1694
++input_row; /* To point to the first component */
1695
++output_row;
1696
}
1697
1698
else
1699
# endif
1700
aindex = channels;
1701
1702
/* Use row_end in place of a loop counter: */
1703
row_end = output_row + image->width * (channels+1);
1704
1705
while (y-- > 0)
1706
{
1707
png_const_uint_16p in_ptr = input_row;
1708
png_bytep out_ptr = output_row;
1709
1710
while (out_ptr < row_end)
1711
{
1712
png_uint_16 alpha = in_ptr[aindex];
1713
png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
1714
png_uint_32 reciprocal = 0;
1715
int c;
1716
1717
/* Scale and write the alpha channel. */
1718
out_ptr[aindex] = alphabyte;
1719
1720
if (alphabyte > 0 && alphabyte < 255)
1721
reciprocal = UNP_RECIPROCAL(alpha);
1722
1723
c = channels;
1724
do /* always at least one channel */
1725
*out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal);
1726
while (--c > 0);
1727
1728
/* Skip to next component (skip the intervening alpha channel) */
1729
++in_ptr;
1730
++out_ptr;
1731
} /* while out_ptr < row_end */
1732
1733
png_write_row(png_ptr, png_voidcast(png_const_bytep,
1734
display->local_row));
1735
input_row += display->row_bytes/(sizeof (png_uint_16));
1736
} /* while y */
1737
}
1738
1739
else
1740
{
1741
/* No alpha channel, so the row_end really is the end of the row and it
1742
* is sufficient to loop over the components one by one.
1743
*/
1744
png_bytep row_end = output_row + image->width * channels;
1745
1746
while (y-- > 0)
1747
{
1748
png_const_uint_16p in_ptr = input_row;
1749
png_bytep out_ptr = output_row;
1750
1751
while (out_ptr < row_end)
1752
{
1753
png_uint_32 component = *in_ptr++;
1754
1755
component *= 255;
1756
*out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component);
1757
}
1758
1759
png_write_row(png_ptr, output_row);
1760
input_row += display->row_bytes/(sizeof (png_uint_16));
1761
}
1762
}
1763
1764
return 1;
1765
}
1766
1767
static void
1768
png_image_set_PLTE(png_image_write_control *display)
1769
{
1770
const png_imagep image = display->image;
1771
const void *cmap = display->colormap;
1772
const int entries = image->colormap_entries > 256 ? 256 :
1773
(int)image->colormap_entries;
1774
1775
/* NOTE: the caller must check for cmap != NULL and entries != 0 */
1776
const png_uint_32 format = image->format;
1777
const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
1778
1779
# if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
1780
defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED)
1781
const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
1782
(format & PNG_FORMAT_FLAG_ALPHA) != 0;
1783
# else
1784
# define afirst 0
1785
# endif
1786
1787
# ifdef PNG_FORMAT_BGR_SUPPORTED
1788
const int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
1789
# else
1790
# define bgr 0
1791
# endif
1792
1793
int i, num_trans;
1794
png_color palette[256];
1795
png_byte tRNS[256];
1796
1797
memset(tRNS, 255, (sizeof tRNS));
1798
memset(palette, 0, (sizeof palette));
1799
1800
for (i=num_trans=0; i<entries; ++i)
1801
{
1802
/* This gets automatically converted to sRGB with reversal of the
1803
* pre-multiplication if the color-map has an alpha channel.
1804
*/
1805
if ((format & PNG_FORMAT_FLAG_LINEAR) != 0)
1806
{
1807
png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap);
1808
1809
entry += i * channels;
1810
1811
if ((channels & 1) != 0) /* no alpha */
1812
{
1813
if (channels >= 3) /* RGB */
1814
{
1815
palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
1816
entry[(2 ^ bgr)]);
1817
palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
1818
entry[1]);
1819
palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
1820
entry[bgr]);
1821
}
1822
1823
else /* Gray */
1824
palette[i].blue = palette[i].red = palette[i].green =
1825
(png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry);
1826
}
1827
1828
else /* alpha */
1829
{
1830
png_uint_16 alpha = entry[afirst ? 0 : channels-1];
1831
png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
1832
png_uint_32 reciprocal = 0;
1833
1834
/* Calculate a reciprocal, as in the png_write_image_8bit code above
1835
* this is designed to produce a value scaled to 255*65535 when
1836
* divided by 128 (i.e. asr 7).
1837
*/
1838
if (alphabyte > 0 && alphabyte < 255)
1839
reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha;
1840
1841
tRNS[i] = alphabyte;
1842
if (alphabyte < 255)
1843
num_trans = i+1;
1844
1845
if (channels >= 3) /* RGB */
1846
{
1847
palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)],
1848
alpha, reciprocal);
1849
palette[i].green = png_unpremultiply(entry[afirst + 1], alpha,
1850
reciprocal);
1851
palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha,
1852
reciprocal);
1853
}
1854
1855
else /* gray */
1856
palette[i].blue = palette[i].red = palette[i].green =
1857
png_unpremultiply(entry[afirst], alpha, reciprocal);
1858
}
1859
}
1860
1861
else /* Color-map has sRGB values */
1862
{
1863
png_const_bytep entry = png_voidcast(png_const_bytep, cmap);
1864
1865
entry += i * channels;
1866
1867
switch (channels)
1868
{
1869
case 4:
1870
tRNS[i] = entry[afirst ? 0 : 3];
1871
if (tRNS[i] < 255)
1872
num_trans = i+1;
1873
/* FALL THROUGH */
1874
case 3:
1875
palette[i].blue = entry[afirst + (2 ^ bgr)];
1876
palette[i].green = entry[afirst + 1];
1877
palette[i].red = entry[afirst + bgr];
1878
break;
1879
1880
case 2:
1881
tRNS[i] = entry[1 ^ afirst];
1882
if (tRNS[i] < 255)
1883
num_trans = i+1;
1884
/* FALL THROUGH */
1885
case 1:
1886
palette[i].blue = palette[i].red = palette[i].green =
1887
entry[afirst];
1888
break;
1889
1890
default:
1891
break;
1892
}
1893
}
1894
}
1895
1896
# ifdef afirst
1897
# undef afirst
1898
# endif
1899
# ifdef bgr
1900
# undef bgr
1901
# endif
1902
1903
png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette,
1904
entries);
1905
1906
if (num_trans > 0)
1907
png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS,
1908
num_trans, NULL);
1909
1910
image->colormap_entries = entries;
1911
}
1912
1913
static int
1914
png_image_write_main(png_voidp argument)
1915
{
1916
png_image_write_control *display = png_voidcast(png_image_write_control*,
1917
argument);
1918
png_imagep image = display->image;
1919
png_structrp png_ptr = image->opaque->png_ptr;
1920
png_inforp info_ptr = image->opaque->info_ptr;
1921
png_uint_32 format = image->format;
1922
1923
/* The following four ints are actually booleans */
1924
int colormap = (format & PNG_FORMAT_FLAG_COLORMAP);
1925
int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR); /* input */
1926
int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA);
1927
int write_16bit = linear && !colormap && (display->convert_to_8bit == 0);
1928
1929
# ifdef PNG_BENIGN_ERRORS_SUPPORTED
1930
/* Make sure we error out on any bad situation */
1931
png_set_benign_errors(png_ptr, 0/*error*/);
1932
# endif
1933
1934
/* Default the 'row_stride' parameter if required. */
1935
if (display->row_stride == 0)
1936
display->row_stride = PNG_IMAGE_ROW_STRIDE(*image);
1937
1938
/* Set the required transforms then write the rows in the correct order. */
1939
if ((format & PNG_FORMAT_FLAG_COLORMAP) != 0)
1940
{
1941
if (display->colormap != NULL && image->colormap_entries > 0)
1942
{
1943
png_uint_32 entries = image->colormap_entries;
1944
1945
png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
1946
entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)),
1947
PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
1948
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
1949
1950
png_image_set_PLTE(display);
1951
}
1952
1953
else
1954
png_error(image->opaque->png_ptr,
1955
"no color-map for color-mapped image");
1956
}
1957
1958
else
1959
png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
1960
write_16bit ? 16 : 8,
1961
((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) +
1962
((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0),
1963
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
1964
1965
/* Counter-intuitively the data transformations must be called *after*
1966
* png_write_info, not before as in the read code, but the 'set' functions
1967
* must still be called before. Just set the color space information, never
1968
* write an interlaced image.
1969
*/
1970
1971
if (write_16bit != 0)
1972
{
1973
/* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */
1974
png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR);
1975
1976
if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
1977
png_set_cHRM_fixed(png_ptr, info_ptr,
1978
/* color x y */
1979
/* white */ 31270, 32900,
1980
/* red */ 64000, 33000,
1981
/* green */ 30000, 60000,
1982
/* blue */ 15000, 6000
1983
);
1984
}
1985
1986
else if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
1987
png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL);
1988
1989
/* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit
1990
* space must still be gamma encoded.
1991
*/
1992
else
1993
png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
1994
1995
/* Write the file header. */
1996
png_write_info(png_ptr, info_ptr);
1997
1998
/* Now set up the data transformations (*after* the header is written),
1999
* remove the handled transformations from the 'format' flags for checking.
2000
*
2001
* First check for a little endian system if writing 16 bit files.
2002
*/
2003
if (write_16bit != 0)
2004
{
2005
PNG_CONST png_uint_16 le = 0x0001;
2006
2007
if ((*(png_const_bytep) & le) != 0)
2008
png_set_swap(png_ptr);
2009
}
2010
2011
# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
2012
if ((format & PNG_FORMAT_FLAG_BGR) != 0)
2013
{
2014
if (colormap == 0 && (format & PNG_FORMAT_FLAG_COLOR) != 0)
2015
png_set_bgr(png_ptr);
2016
format &= ~PNG_FORMAT_FLAG_BGR;
2017
}
2018
# endif
2019
2020
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
2021
if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
2022
{
2023
if (colormap == 0 && (format & PNG_FORMAT_FLAG_ALPHA) != 0)
2024
png_set_swap_alpha(png_ptr);
2025
format &= ~PNG_FORMAT_FLAG_AFIRST;
2026
}
2027
# endif
2028
2029
/* If there are 16 or fewer color-map entries we wrote a lower bit depth
2030
* above, but the application data is still byte packed.
2031
*/
2032
if (colormap != 0 && image->colormap_entries <= 16)
2033
png_set_packing(png_ptr);
2034
2035
/* That should have handled all (both) the transforms. */
2036
if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR |
2037
PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0)
2038
png_error(png_ptr, "png_write_image: unsupported transformation");
2039
2040
{
2041
png_const_bytep row = png_voidcast(png_const_bytep, display->buffer);
2042
ptrdiff_t row_bytes = display->row_stride;
2043
2044
if (linear != 0)
2045
row_bytes *= (sizeof (png_uint_16));
2046
2047
if (row_bytes < 0)
2048
row += (image->height-1) * (-row_bytes);
2049
2050
display->first_row = row;
2051
display->row_bytes = row_bytes;
2052
}
2053
2054
/* Apply 'fast' options if the flag is set. */
2055
if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0)
2056
{
2057
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS);
2058
/* NOTE: determined by experiment using pngstest, this reflects some
2059
* balance between the time to write the image once and the time to read
2060
* it about 50 times. The speed-up in pngstest was about 10-20% of the
2061
* total (user) time on a heavily loaded system.
2062
*/
2063
# ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
2064
png_set_compression_level(png_ptr, 3);
2065
# endif
2066
}
2067
2068
/* Check for the cases that currently require a pre-transform on the row
2069
* before it is written. This only applies when the input is 16-bit and
2070
* either there is an alpha channel or it is converted to 8-bit.
2071
*/
2072
if ((linear != 0 && alpha != 0 ) ||
2073
(colormap == 0 && display->convert_to_8bit != 0))
2074
{
2075
png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr,
2076
png_get_rowbytes(png_ptr, info_ptr)));
2077
int result;
2078
2079
display->local_row = row;
2080
if (write_16bit != 0)
2081
result = png_safe_execute(image, png_write_image_16bit, display);
2082
else
2083
result = png_safe_execute(image, png_write_image_8bit, display);
2084
display->local_row = NULL;
2085
2086
png_free(png_ptr, row);
2087
2088
/* Skip the 'write_end' on error: */
2089
if (result == 0)
2090
return 0;
2091
}
2092
2093
/* Otherwise this is the case where the input is in a format currently
2094
* supported by the rest of the libpng write code; call it directly.
2095
*/
2096
else
2097
{
2098
png_const_bytep row = png_voidcast(png_const_bytep, display->first_row);
2099
ptrdiff_t row_bytes = display->row_bytes;
2100
png_uint_32 y = image->height;
2101
2102
while (y-- > 0)
2103
{
2104
png_write_row(png_ptr, row);
2105
row += row_bytes;
2106
}
2107
}
2108
2109
png_write_end(png_ptr, info_ptr);
2110
return 1;
2111
}
2112
2113
int PNGAPI
2114
png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit,
2115
const void *buffer, png_int_32 row_stride, const void *colormap)
2116
{
2117
/* Write the image to the given (FILE*). */
2118
if (image != NULL && image->version == PNG_IMAGE_VERSION)
2119
{
2120
if (file != NULL)
2121
{
2122
if (png_image_write_init(image) != 0)
2123
{
2124
png_image_write_control display;
2125
int result;
2126
2127
/* This is slightly evil, but png_init_io doesn't do anything other
2128
* than this and we haven't changed the standard IO functions so
2129
* this saves a 'safe' function.
2130
*/
2131
image->opaque->png_ptr->io_ptr = file;
2132
2133
memset(&display, 0, (sizeof display));
2134
display.image = image;
2135
display.buffer = buffer;
2136
display.row_stride = row_stride;
2137
display.colormap = colormap;
2138
display.convert_to_8bit = convert_to_8bit;
2139
2140
result = png_safe_execute(image, png_image_write_main, &display);
2141
png_image_free(image);
2142
return result;
2143
}
2144
2145
else
2146
return 0;
2147
}
2148
2149
else
2150
return png_image_error(image,
2151
"png_image_write_to_stdio: invalid argument");
2152
}
2153
2154
else if (image != NULL)
2155
return png_image_error(image,
2156
"png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION");
2157
2158
else
2159
return 0;
2160
}
2161
2162
int PNGAPI
2163
png_image_write_to_file(png_imagep image, const char *file_name,
2164
int convert_to_8bit, const void *buffer, png_int_32 row_stride,
2165
const void *colormap)
2166
{
2167
/* Write the image to the named file. */
2168
if (image != NULL && image->version == PNG_IMAGE_VERSION)
2169
{
2170
if (file_name != NULL)
2171
{
2172
FILE *fp = fopen(file_name, "wb");
2173
2174
if (fp != NULL)
2175
{
2176
if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer,
2177
row_stride, colormap) != 0)
2178
{
2179
int error; /* from fflush/fclose */
2180
2181
/* Make sure the file is flushed correctly. */
2182
if (fflush(fp) == 0 && ferror(fp) == 0)
2183
{
2184
if (fclose(fp) == 0)
2185
return 1;
2186
2187
error = errno; /* from fclose */
2188
}
2189
2190
else
2191
{
2192
error = errno; /* from fflush or ferror */
2193
(void)fclose(fp);
2194
}
2195
2196
(void)remove(file_name);
2197
/* The image has already been cleaned up; this is just used to
2198
* set the error (because the original write succeeded).
2199
*/
2200
return png_image_error(image, strerror(error));
2201
}
2202
2203
else
2204
{
2205
/* Clean up: just the opened file. */
2206
(void)fclose(fp);
2207
(void)remove(file_name);
2208
return 0;
2209
}
2210
}
2211
2212
else
2213
return png_image_error(image, strerror(errno));
2214
}
2215
2216
else
2217
return png_image_error(image,
2218
"png_image_write_to_file: invalid argument");
2219
}
2220
2221
else if (image != NULL)
2222
return png_image_error(image,
2223
"png_image_write_to_file: incorrect PNG_IMAGE_VERSION");
2224
2225
else
2226
return 0;
2227
}
2228
# endif /* STDIO */
2229
#endif /* SIMPLIFIED_WRITE */
2230
#endif /* WRITE */
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