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authorDavid Walter Seikel2013-01-13 18:54:10 +1000
committerDavid Walter Seikel2013-01-13 18:54:10 +1000
commit959831f4ef5a3e797f576c3de08cd65032c997ad (patch)
treee7351908be5995f0b325b2ebeaa02d5a34b82583 /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c
parentAdd info about changes to Irrlicht. (diff)
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Remove damned ancient DOS line endings from Irrlicht. Hopefully I did not go overboard.
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c')
-rw-r--r--libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c798
1 files changed, 399 insertions, 399 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c
index 13f953b..5fe8328 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/wrgif.c
@@ -1,399 +1,399 @@
1/* 1/*
2 * wrgif.c 2 * wrgif.c
3 * 3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane. 4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software. 5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file. 6 * For conditions of distribution and use, see the accompanying README file.
7 * 7 *
8 * This file contains routines to write output images in GIF format. 8 * This file contains routines to write output images in GIF format.
9 * 9 *
10 ************************************************************************** 10 **************************************************************************
11 * NOTE: to avoid entanglements with Unisys' patent on LZW compression, * 11 * NOTE: to avoid entanglements with Unisys' patent on LZW compression, *
12 * this code has been modified to output "uncompressed GIF" files. * 12 * this code has been modified to output "uncompressed GIF" files. *
13 * There is no trace of the LZW algorithm in this file. * 13 * There is no trace of the LZW algorithm in this file. *
14 ************************************************************************** 14 **************************************************************************
15 * 15 *
16 * These routines may need modification for non-Unix environments or 16 * These routines may need modification for non-Unix environments or
17 * specialized applications. As they stand, they assume output to 17 * specialized applications. As they stand, they assume output to
18 * an ordinary stdio stream. 18 * an ordinary stdio stream.
19 */ 19 */
20 20
21/* 21/*
22 * This code is loosely based on ppmtogif from the PBMPLUS distribution 22 * This code is loosely based on ppmtogif from the PBMPLUS distribution
23 * of Feb. 1991. That file contains the following copyright notice: 23 * of Feb. 1991. That file contains the following copyright notice:
24 * Based on GIFENCODE by David Rowley <mgardi@watdscu.waterloo.edu>. 24 * Based on GIFENCODE by David Rowley <mgardi@watdscu.waterloo.edu>.
25 * Lempel-Ziv compression based on "compress" by Spencer W. Thomas et al. 25 * Lempel-Ziv compression based on "compress" by Spencer W. Thomas et al.
26 * Copyright (C) 1989 by Jef Poskanzer. 26 * Copyright (C) 1989 by Jef Poskanzer.
27 * Permission to use, copy, modify, and distribute this software and its 27 * Permission to use, copy, modify, and distribute this software and its
28 * documentation for any purpose and without fee is hereby granted, provided 28 * documentation for any purpose and without fee is hereby granted, provided
29 * that the above copyright notice appear in all copies and that both that 29 * that the above copyright notice appear in all copies and that both that
30 * copyright notice and this permission notice appear in supporting 30 * copyright notice and this permission notice appear in supporting
31 * documentation. This software is provided "as is" without express or 31 * documentation. This software is provided "as is" without express or
32 * implied warranty. 32 * implied warranty.
33 * 33 *
34 * We are also required to state that 34 * We are also required to state that
35 * "The Graphics Interchange Format(c) is the Copyright property of 35 * "The Graphics Interchange Format(c) is the Copyright property of
36 * CompuServe Incorporated. GIF(sm) is a Service Mark property of 36 * CompuServe Incorporated. GIF(sm) is a Service Mark property of
37 * CompuServe Incorporated." 37 * CompuServe Incorporated."
38 */ 38 */
39 39
40#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 40#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
41 41
42#ifdef GIF_SUPPORTED 42#ifdef GIF_SUPPORTED
43 43
44 44
45/* Private version of data destination object */ 45/* Private version of data destination object */
46 46
47typedef struct { 47typedef struct {
48 struct djpeg_dest_struct pub; /* public fields */ 48 struct djpeg_dest_struct pub; /* public fields */
49 49
50 j_decompress_ptr cinfo; /* back link saves passing separate parm */ 50 j_decompress_ptr cinfo; /* back link saves passing separate parm */
51 51
52 /* State for packing variable-width codes into a bitstream */ 52 /* State for packing variable-width codes into a bitstream */
53 int n_bits; /* current number of bits/code */ 53 int n_bits; /* current number of bits/code */
54 int maxcode; /* maximum code, given n_bits */ 54 int maxcode; /* maximum code, given n_bits */
55 INT32 cur_accum; /* holds bits not yet output */ 55 INT32 cur_accum; /* holds bits not yet output */
56 int cur_bits; /* # of bits in cur_accum */ 56 int cur_bits; /* # of bits in cur_accum */
57 57
58 /* State for GIF code assignment */ 58 /* State for GIF code assignment */
59 int ClearCode; /* clear code (doesn't change) */ 59 int ClearCode; /* clear code (doesn't change) */
60 int EOFCode; /* EOF code (ditto) */ 60 int EOFCode; /* EOF code (ditto) */
61 int code_counter; /* counts output symbols */ 61 int code_counter; /* counts output symbols */
62 62
63 /* GIF data packet construction buffer */ 63 /* GIF data packet construction buffer */
64 int bytesinpkt; /* # of bytes in current packet */ 64 int bytesinpkt; /* # of bytes in current packet */
65 char packetbuf[256]; /* workspace for accumulating packet */ 65 char packetbuf[256]; /* workspace for accumulating packet */
66 66
67} gif_dest_struct; 67} gif_dest_struct;
68 68
69typedef gif_dest_struct * gif_dest_ptr; 69typedef gif_dest_struct * gif_dest_ptr;
70 70
71/* Largest value that will fit in N bits */ 71/* Largest value that will fit in N bits */
72#define MAXCODE(n_bits) ((1 << (n_bits)) - 1) 72#define MAXCODE(n_bits) ((1 << (n_bits)) - 1)
73 73
74 74
75/* 75/*
76 * Routines to package finished data bytes into GIF data blocks. 76 * Routines to package finished data bytes into GIF data blocks.
77 * A data block consists of a count byte (1..255) and that many data bytes. 77 * A data block consists of a count byte (1..255) and that many data bytes.
78 */ 78 */
79 79
80LOCAL(void) 80LOCAL(void)
81flush_packet (gif_dest_ptr dinfo) 81flush_packet (gif_dest_ptr dinfo)
82/* flush any accumulated data */ 82/* flush any accumulated data */
83{ 83{
84 if (dinfo->bytesinpkt > 0) { /* never write zero-length packet */ 84 if (dinfo->bytesinpkt > 0) { /* never write zero-length packet */
85 dinfo->packetbuf[0] = (char) dinfo->bytesinpkt++; 85 dinfo->packetbuf[0] = (char) dinfo->bytesinpkt++;
86 if (JFWRITE(dinfo->pub.output_file, dinfo->packetbuf, dinfo->bytesinpkt) 86 if (JFWRITE(dinfo->pub.output_file, dinfo->packetbuf, dinfo->bytesinpkt)
87 != (size_t) dinfo->bytesinpkt) 87 != (size_t) dinfo->bytesinpkt)
88 ERREXIT(dinfo->cinfo, JERR_FILE_WRITE); 88 ERREXIT(dinfo->cinfo, JERR_FILE_WRITE);
89 dinfo->bytesinpkt = 0; 89 dinfo->bytesinpkt = 0;
90 } 90 }
91} 91}
92 92
93 93
94/* Add a character to current packet; flush to disk if necessary */ 94/* Add a character to current packet; flush to disk if necessary */
95#define CHAR_OUT(dinfo,c) \ 95#define CHAR_OUT(dinfo,c) \
96 { (dinfo)->packetbuf[++(dinfo)->bytesinpkt] = (char) (c); \ 96 { (dinfo)->packetbuf[++(dinfo)->bytesinpkt] = (char) (c); \
97 if ((dinfo)->bytesinpkt >= 255) \ 97 if ((dinfo)->bytesinpkt >= 255) \
98 flush_packet(dinfo); \ 98 flush_packet(dinfo); \
99 } 99 }
100 100
101 101
102/* Routine to convert variable-width codes into a byte stream */ 102/* Routine to convert variable-width codes into a byte stream */
103 103
104LOCAL(void) 104LOCAL(void)
105output (gif_dest_ptr dinfo, int code) 105output (gif_dest_ptr dinfo, int code)
106/* Emit a code of n_bits bits */ 106/* Emit a code of n_bits bits */
107/* Uses cur_accum and cur_bits to reblock into 8-bit bytes */ 107/* Uses cur_accum and cur_bits to reblock into 8-bit bytes */
108{ 108{
109 dinfo->cur_accum |= ((INT32) code) << dinfo->cur_bits; 109 dinfo->cur_accum |= ((INT32) code) << dinfo->cur_bits;
110 dinfo->cur_bits += dinfo->n_bits; 110 dinfo->cur_bits += dinfo->n_bits;
111 111
112 while (dinfo->cur_bits >= 8) { 112 while (dinfo->cur_bits >= 8) {
113 CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF); 113 CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF);
114 dinfo->cur_accum >>= 8; 114 dinfo->cur_accum >>= 8;
115 dinfo->cur_bits -= 8; 115 dinfo->cur_bits -= 8;
116 } 116 }
117} 117}
118 118
119 119
120/* The pseudo-compression algorithm. 120/* The pseudo-compression algorithm.
121 * 121 *
122 * In this module we simply output each pixel value as a separate symbol; 122 * In this module we simply output each pixel value as a separate symbol;
123 * thus, no compression occurs. In fact, there is expansion of one bit per 123 * thus, no compression occurs. In fact, there is expansion of one bit per
124 * pixel, because we use a symbol width one bit wider than the pixel width. 124 * pixel, because we use a symbol width one bit wider than the pixel width.
125 * 125 *
126 * GIF ordinarily uses variable-width symbols, and the decoder will expect 126 * GIF ordinarily uses variable-width symbols, and the decoder will expect
127 * to ratchet up the symbol width after a fixed number of symbols. 127 * to ratchet up the symbol width after a fixed number of symbols.
128 * To simplify the logic and keep the expansion penalty down, we emit a 128 * To simplify the logic and keep the expansion penalty down, we emit a
129 * GIF Clear code to reset the decoder just before the width would ratchet up. 129 * GIF Clear code to reset the decoder just before the width would ratchet up.
130 * Thus, all the symbols in the output file will have the same bit width. 130 * Thus, all the symbols in the output file will have the same bit width.
131 * Note that emitting the Clear codes at the right times is a mere matter of 131 * Note that emitting the Clear codes at the right times is a mere matter of
132 * counting output symbols and is in no way dependent on the LZW patent. 132 * counting output symbols and is in no way dependent on the LZW patent.
133 * 133 *
134 * With a small basic pixel width (low color count), Clear codes will be 134 * With a small basic pixel width (low color count), Clear codes will be
135 * needed very frequently, causing the file to expand even more. So this 135 * needed very frequently, causing the file to expand even more. So this
136 * simplistic approach wouldn't work too well on bilevel images, for example. 136 * simplistic approach wouldn't work too well on bilevel images, for example.
137 * But for output of JPEG conversions the pixel width will usually be 8 bits 137 * But for output of JPEG conversions the pixel width will usually be 8 bits
138 * (129 to 256 colors), so the overhead added by Clear symbols is only about 138 * (129 to 256 colors), so the overhead added by Clear symbols is only about
139 * one symbol in every 256. 139 * one symbol in every 256.
140 */ 140 */
141 141
142LOCAL(void) 142LOCAL(void)
143compress_init (gif_dest_ptr dinfo, int i_bits) 143compress_init (gif_dest_ptr dinfo, int i_bits)
144/* Initialize pseudo-compressor */ 144/* Initialize pseudo-compressor */
145{ 145{
146 /* init all the state variables */ 146 /* init all the state variables */
147 dinfo->n_bits = i_bits; 147 dinfo->n_bits = i_bits;
148 dinfo->maxcode = MAXCODE(dinfo->n_bits); 148 dinfo->maxcode = MAXCODE(dinfo->n_bits);
149 dinfo->ClearCode = (1 << (i_bits - 1)); 149 dinfo->ClearCode = (1 << (i_bits - 1));
150 dinfo->EOFCode = dinfo->ClearCode + 1; 150 dinfo->EOFCode = dinfo->ClearCode + 1;
151 dinfo->code_counter = dinfo->ClearCode + 2; 151 dinfo->code_counter = dinfo->ClearCode + 2;
152 /* init output buffering vars */ 152 /* init output buffering vars */
153 dinfo->bytesinpkt = 0; 153 dinfo->bytesinpkt = 0;
154 dinfo->cur_accum = 0; 154 dinfo->cur_accum = 0;
155 dinfo->cur_bits = 0; 155 dinfo->cur_bits = 0;
156 /* GIF specifies an initial Clear code */ 156 /* GIF specifies an initial Clear code */
157 output(dinfo, dinfo->ClearCode); 157 output(dinfo, dinfo->ClearCode);
158} 158}
159 159
160 160
161LOCAL(void) 161LOCAL(void)
162compress_pixel (gif_dest_ptr dinfo, int c) 162compress_pixel (gif_dest_ptr dinfo, int c)
163/* Accept and "compress" one pixel value. 163/* Accept and "compress" one pixel value.
164 * The given value must be less than n_bits wide. 164 * The given value must be less than n_bits wide.
165 */ 165 */
166{ 166{
167 /* Output the given pixel value as a symbol. */ 167 /* Output the given pixel value as a symbol. */
168 output(dinfo, c); 168 output(dinfo, c);
169 /* Issue Clear codes often enough to keep the reader from ratcheting up 169 /* Issue Clear codes often enough to keep the reader from ratcheting up
170 * its symbol size. 170 * its symbol size.
171 */ 171 */
172 if (dinfo->code_counter < dinfo->maxcode) { 172 if (dinfo->code_counter < dinfo->maxcode) {
173 dinfo->code_counter++; 173 dinfo->code_counter++;
174 } else { 174 } else {
175 output(dinfo, dinfo->ClearCode); 175 output(dinfo, dinfo->ClearCode);
176 dinfo->code_counter = dinfo->ClearCode + 2; /* reset the counter */ 176 dinfo->code_counter = dinfo->ClearCode + 2; /* reset the counter */
177 } 177 }
178} 178}
179 179
180 180
181LOCAL(void) 181LOCAL(void)
182compress_term (gif_dest_ptr dinfo) 182compress_term (gif_dest_ptr dinfo)
183/* Clean up at end */ 183/* Clean up at end */
184{ 184{
185 /* Send an EOF code */ 185 /* Send an EOF code */
186 output(dinfo, dinfo->EOFCode); 186 output(dinfo, dinfo->EOFCode);
187 /* Flush the bit-packing buffer */ 187 /* Flush the bit-packing buffer */
188 if (dinfo->cur_bits > 0) { 188 if (dinfo->cur_bits > 0) {
189 CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF); 189 CHAR_OUT(dinfo, dinfo->cur_accum & 0xFF);
190 } 190 }
191 /* Flush the packet buffer */ 191 /* Flush the packet buffer */
192 flush_packet(dinfo); 192 flush_packet(dinfo);
193} 193}
194 194
195 195
196/* GIF header construction */ 196/* GIF header construction */
197 197
198 198
199LOCAL(void) 199LOCAL(void)
200put_word (gif_dest_ptr dinfo, unsigned int w) 200put_word (gif_dest_ptr dinfo, unsigned int w)
201/* Emit a 16-bit word, LSB first */ 201/* Emit a 16-bit word, LSB first */
202{ 202{
203 putc(w & 0xFF, dinfo->pub.output_file); 203 putc(w & 0xFF, dinfo->pub.output_file);
204 putc((w >> 8) & 0xFF, dinfo->pub.output_file); 204 putc((w >> 8) & 0xFF, dinfo->pub.output_file);
205} 205}
206 206
207 207
208LOCAL(void) 208LOCAL(void)
209put_3bytes (gif_dest_ptr dinfo, int val) 209put_3bytes (gif_dest_ptr dinfo, int val)
210/* Emit 3 copies of same byte value --- handy subr for colormap construction */ 210/* Emit 3 copies of same byte value --- handy subr for colormap construction */
211{ 211{
212 putc(val, dinfo->pub.output_file); 212 putc(val, dinfo->pub.output_file);
213 putc(val, dinfo->pub.output_file); 213 putc(val, dinfo->pub.output_file);
214 putc(val, dinfo->pub.output_file); 214 putc(val, dinfo->pub.output_file);
215} 215}
216 216
217 217
218LOCAL(void) 218LOCAL(void)
219emit_header (gif_dest_ptr dinfo, int num_colors, JSAMPARRAY colormap) 219emit_header (gif_dest_ptr dinfo, int num_colors, JSAMPARRAY colormap)
220/* Output the GIF file header, including color map */ 220/* Output the GIF file header, including color map */
221/* If colormap==NULL, synthesize a gray-scale colormap */ 221/* If colormap==NULL, synthesize a gray-scale colormap */
222{ 222{
223 int BitsPerPixel, ColorMapSize, InitCodeSize, FlagByte; 223 int BitsPerPixel, ColorMapSize, InitCodeSize, FlagByte;
224 int cshift = dinfo->cinfo->data_precision - 8; 224 int cshift = dinfo->cinfo->data_precision - 8;
225 int i; 225 int i;
226 226
227 if (num_colors > 256) 227 if (num_colors > 256)
228 ERREXIT1(dinfo->cinfo, JERR_TOO_MANY_COLORS, num_colors); 228 ERREXIT1(dinfo->cinfo, JERR_TOO_MANY_COLORS, num_colors);
229 /* Compute bits/pixel and related values */ 229 /* Compute bits/pixel and related values */
230 BitsPerPixel = 1; 230 BitsPerPixel = 1;
231 while (num_colors > (1 << BitsPerPixel)) 231 while (num_colors > (1 << BitsPerPixel))
232 BitsPerPixel++; 232 BitsPerPixel++;
233 ColorMapSize = 1 << BitsPerPixel; 233 ColorMapSize = 1 << BitsPerPixel;
234 if (BitsPerPixel <= 1) 234 if (BitsPerPixel <= 1)
235 InitCodeSize = 2; 235 InitCodeSize = 2;
236 else 236 else
237 InitCodeSize = BitsPerPixel; 237 InitCodeSize = BitsPerPixel;
238 /* 238 /*
239 * Write the GIF header. 239 * Write the GIF header.
240 * Note that we generate a plain GIF87 header for maximum compatibility. 240 * Note that we generate a plain GIF87 header for maximum compatibility.
241 */ 241 */
242 putc('G', dinfo->pub.output_file); 242 putc('G', dinfo->pub.output_file);
243 putc('I', dinfo->pub.output_file); 243 putc('I', dinfo->pub.output_file);
244 putc('F', dinfo->pub.output_file); 244 putc('F', dinfo->pub.output_file);
245 putc('8', dinfo->pub.output_file); 245 putc('8', dinfo->pub.output_file);
246 putc('7', dinfo->pub.output_file); 246 putc('7', dinfo->pub.output_file);
247 putc('a', dinfo->pub.output_file); 247 putc('a', dinfo->pub.output_file);
248 /* Write the Logical Screen Descriptor */ 248 /* Write the Logical Screen Descriptor */
249 put_word(dinfo, (unsigned int) dinfo->cinfo->output_width); 249 put_word(dinfo, (unsigned int) dinfo->cinfo->output_width);
250 put_word(dinfo, (unsigned int) dinfo->cinfo->output_height); 250 put_word(dinfo, (unsigned int) dinfo->cinfo->output_height);
251 FlagByte = 0x80; /* Yes, there is a global color table */ 251 FlagByte = 0x80; /* Yes, there is a global color table */
252 FlagByte |= (BitsPerPixel-1) << 4; /* color resolution */ 252 FlagByte |= (BitsPerPixel-1) << 4; /* color resolution */
253 FlagByte |= (BitsPerPixel-1); /* size of global color table */ 253 FlagByte |= (BitsPerPixel-1); /* size of global color table */
254 putc(FlagByte, dinfo->pub.output_file); 254 putc(FlagByte, dinfo->pub.output_file);
255 putc(0, dinfo->pub.output_file); /* Background color index */ 255 putc(0, dinfo->pub.output_file); /* Background color index */
256 putc(0, dinfo->pub.output_file); /* Reserved (aspect ratio in GIF89) */ 256 putc(0, dinfo->pub.output_file); /* Reserved (aspect ratio in GIF89) */
257 /* Write the Global Color Map */ 257 /* Write the Global Color Map */
258 /* If the color map is more than 8 bits precision, */ 258 /* If the color map is more than 8 bits precision, */
259 /* we reduce it to 8 bits by shifting */ 259 /* we reduce it to 8 bits by shifting */
260 for (i=0; i < ColorMapSize; i++) { 260 for (i=0; i < ColorMapSize; i++) {
261 if (i < num_colors) { 261 if (i < num_colors) {
262 if (colormap != NULL) { 262 if (colormap != NULL) {
263 if (dinfo->cinfo->out_color_space == JCS_RGB) { 263 if (dinfo->cinfo->out_color_space == JCS_RGB) {
264 /* Normal case: RGB color map */ 264 /* Normal case: RGB color map */
265 putc(GETJSAMPLE(colormap[0][i]) >> cshift, dinfo->pub.output_file); 265 putc(GETJSAMPLE(colormap[0][i]) >> cshift, dinfo->pub.output_file);
266 putc(GETJSAMPLE(colormap[1][i]) >> cshift, dinfo->pub.output_file); 266 putc(GETJSAMPLE(colormap[1][i]) >> cshift, dinfo->pub.output_file);
267 putc(GETJSAMPLE(colormap[2][i]) >> cshift, dinfo->pub.output_file); 267 putc(GETJSAMPLE(colormap[2][i]) >> cshift, dinfo->pub.output_file);
268 } else { 268 } else {
269 /* Grayscale "color map": possible if quantizing grayscale image */ 269 /* Grayscale "color map": possible if quantizing grayscale image */
270 put_3bytes(dinfo, GETJSAMPLE(colormap[0][i]) >> cshift); 270 put_3bytes(dinfo, GETJSAMPLE(colormap[0][i]) >> cshift);
271 } 271 }
272 } else { 272 } else {
273 /* Create a gray-scale map of num_colors values, range 0..255 */ 273 /* Create a gray-scale map of num_colors values, range 0..255 */
274 put_3bytes(dinfo, (i * 255 + (num_colors-1)/2) / (num_colors-1)); 274 put_3bytes(dinfo, (i * 255 + (num_colors-1)/2) / (num_colors-1));
275 } 275 }
276 } else { 276 } else {
277 /* fill out the map to a power of 2 */ 277 /* fill out the map to a power of 2 */
278 put_3bytes(dinfo, 0); 278 put_3bytes(dinfo, 0);
279 } 279 }
280 } 280 }
281 /* Write image separator and Image Descriptor */ 281 /* Write image separator and Image Descriptor */
282 putc(',', dinfo->pub.output_file); /* separator */ 282 putc(',', dinfo->pub.output_file); /* separator */
283 put_word(dinfo, 0); /* left/top offset */ 283 put_word(dinfo, 0); /* left/top offset */
284 put_word(dinfo, 0); 284 put_word(dinfo, 0);
285 put_word(dinfo, (unsigned int) dinfo->cinfo->output_width); /* image size */ 285 put_word(dinfo, (unsigned int) dinfo->cinfo->output_width); /* image size */
286 put_word(dinfo, (unsigned int) dinfo->cinfo->output_height); 286 put_word(dinfo, (unsigned int) dinfo->cinfo->output_height);
287 /* flag byte: not interlaced, no local color map */ 287 /* flag byte: not interlaced, no local color map */
288 putc(0x00, dinfo->pub.output_file); 288 putc(0x00, dinfo->pub.output_file);
289 /* Write Initial Code Size byte */ 289 /* Write Initial Code Size byte */
290 putc(InitCodeSize, dinfo->pub.output_file); 290 putc(InitCodeSize, dinfo->pub.output_file);
291 291
292 /* Initialize for "compression" of image data */ 292 /* Initialize for "compression" of image data */
293 compress_init(dinfo, InitCodeSize+1); 293 compress_init(dinfo, InitCodeSize+1);
294} 294}
295 295
296 296
297/* 297/*
298 * Startup: write the file header. 298 * Startup: write the file header.
299 */ 299 */
300 300
301METHODDEF(void) 301METHODDEF(void)
302start_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) 302start_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
303{ 303{
304 gif_dest_ptr dest = (gif_dest_ptr) dinfo; 304 gif_dest_ptr dest = (gif_dest_ptr) dinfo;
305 305
306 if (cinfo->quantize_colors) 306 if (cinfo->quantize_colors)
307 emit_header(dest, cinfo->actual_number_of_colors, cinfo->colormap); 307 emit_header(dest, cinfo->actual_number_of_colors, cinfo->colormap);
308 else 308 else
309 emit_header(dest, 256, (JSAMPARRAY) NULL); 309 emit_header(dest, 256, (JSAMPARRAY) NULL);
310} 310}
311 311
312 312
313/* 313/*
314 * Write some pixel data. 314 * Write some pixel data.
315 * In this module rows_supplied will always be 1. 315 * In this module rows_supplied will always be 1.
316 */ 316 */
317 317
318METHODDEF(void) 318METHODDEF(void)
319put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, 319put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
320 JDIMENSION rows_supplied) 320 JDIMENSION rows_supplied)
321{ 321{
322 gif_dest_ptr dest = (gif_dest_ptr) dinfo; 322 gif_dest_ptr dest = (gif_dest_ptr) dinfo;
323 register JSAMPROW ptr; 323 register JSAMPROW ptr;
324 register JDIMENSION col; 324 register JDIMENSION col;
325 325
326 ptr = dest->pub.buffer[0]; 326 ptr = dest->pub.buffer[0];
327 for (col = cinfo->output_width; col > 0; col--) { 327 for (col = cinfo->output_width; col > 0; col--) {
328 compress_pixel(dest, GETJSAMPLE(*ptr++)); 328 compress_pixel(dest, GETJSAMPLE(*ptr++));
329 } 329 }
330} 330}
331 331
332 332
333/* 333/*
334 * Finish up at the end of the file. 334 * Finish up at the end of the file.
335 */ 335 */
336 336
337METHODDEF(void) 337METHODDEF(void)
338finish_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) 338finish_output_gif (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
339{ 339{
340 gif_dest_ptr dest = (gif_dest_ptr) dinfo; 340 gif_dest_ptr dest = (gif_dest_ptr) dinfo;
341 341
342 /* Flush "compression" mechanism */ 342 /* Flush "compression" mechanism */
343 compress_term(dest); 343 compress_term(dest);
344 /* Write a zero-length data block to end the series */ 344 /* Write a zero-length data block to end the series */
345 putc(0, dest->pub.output_file); 345 putc(0, dest->pub.output_file);
346 /* Write the GIF terminator mark */ 346 /* Write the GIF terminator mark */
347 putc(';', dest->pub.output_file); 347 putc(';', dest->pub.output_file);
348 /* Make sure we wrote the output file OK */ 348 /* Make sure we wrote the output file OK */
349 fflush(dest->pub.output_file); 349 fflush(dest->pub.output_file);
350 if (ferror(dest->pub.output_file)) 350 if (ferror(dest->pub.output_file))
351 ERREXIT(cinfo, JERR_FILE_WRITE); 351 ERREXIT(cinfo, JERR_FILE_WRITE);
352} 352}
353 353
354 354
355/* 355/*
356 * The module selection routine for GIF format output. 356 * The module selection routine for GIF format output.
357 */ 357 */
358 358
359GLOBAL(djpeg_dest_ptr) 359GLOBAL(djpeg_dest_ptr)
360jinit_write_gif (j_decompress_ptr cinfo) 360jinit_write_gif (j_decompress_ptr cinfo)
361{ 361{
362 gif_dest_ptr dest; 362 gif_dest_ptr dest;
363 363
364 /* Create module interface object, fill in method pointers */ 364 /* Create module interface object, fill in method pointers */
365 dest = (gif_dest_ptr) 365 dest = (gif_dest_ptr)
366 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 366 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
367 SIZEOF(gif_dest_struct)); 367 SIZEOF(gif_dest_struct));
368 dest->cinfo = cinfo; /* make back link for subroutines */ 368 dest->cinfo = cinfo; /* make back link for subroutines */
369 dest->pub.start_output = start_output_gif; 369 dest->pub.start_output = start_output_gif;
370 dest->pub.put_pixel_rows = put_pixel_rows; 370 dest->pub.put_pixel_rows = put_pixel_rows;
371 dest->pub.finish_output = finish_output_gif; 371 dest->pub.finish_output = finish_output_gif;
372 372
373 if (cinfo->out_color_space != JCS_GRAYSCALE && 373 if (cinfo->out_color_space != JCS_GRAYSCALE &&
374 cinfo->out_color_space != JCS_RGB) 374 cinfo->out_color_space != JCS_RGB)
375 ERREXIT(cinfo, JERR_GIF_COLORSPACE); 375 ERREXIT(cinfo, JERR_GIF_COLORSPACE);
376 376
377 /* Force quantization if color or if > 8 bits input */ 377 /* Force quantization if color or if > 8 bits input */
378 if (cinfo->out_color_space != JCS_GRAYSCALE || cinfo->data_precision > 8) { 378 if (cinfo->out_color_space != JCS_GRAYSCALE || cinfo->data_precision > 8) {
379 /* Force quantization to at most 256 colors */ 379 /* Force quantization to at most 256 colors */
380 cinfo->quantize_colors = TRUE; 380 cinfo->quantize_colors = TRUE;
381 if (cinfo->desired_number_of_colors > 256) 381 if (cinfo->desired_number_of_colors > 256)
382 cinfo->desired_number_of_colors = 256; 382 cinfo->desired_number_of_colors = 256;
383 } 383 }
384 384
385 /* Calculate output image dimensions so we can allocate space */ 385 /* Calculate output image dimensions so we can allocate space */
386 jpeg_calc_output_dimensions(cinfo); 386 jpeg_calc_output_dimensions(cinfo);
387 387
388 if (cinfo->output_components != 1) /* safety check: just one component? */ 388 if (cinfo->output_components != 1) /* safety check: just one component? */
389 ERREXIT(cinfo, JERR_GIF_BUG); 389 ERREXIT(cinfo, JERR_GIF_BUG);
390 390
391 /* Create decompressor output buffer. */ 391 /* Create decompressor output buffer. */
392 dest->pub.buffer = (*cinfo->mem->alloc_sarray) 392 dest->pub.buffer = (*cinfo->mem->alloc_sarray)
393 ((j_common_ptr) cinfo, JPOOL_IMAGE, cinfo->output_width, (JDIMENSION) 1); 393 ((j_common_ptr) cinfo, JPOOL_IMAGE, cinfo->output_width, (JDIMENSION) 1);
394 dest->pub.buffer_height = 1; 394 dest->pub.buffer_height = 1;
395 395
396 return (djpeg_dest_ptr) dest; 396 return (djpeg_dest_ptr) dest;
397} 397}
398 398
399#endif /* GIF_SUPPORTED */ 399#endif /* GIF_SUPPORTED */
generated by cgit v1.1 at 2024-08-31 17:18:45 +0000