File: png.trm

package info (click to toggle)
gnuplot 3.7.1p1-4
  • links: PTS
  • area: main
  • in suites: potato
  • size: 5,808 kB
  • ctags: 4,418
  • sloc: ansic: 43,279; lisp: 661; makefile: 647; asm: 539; sh: 416; objc: 379; csh: 297; pascal: 194; perl: 138
file content (474 lines) | stat: -rw-r--r-- 11,666 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/*
 * $Id: png.trm,v 1.11.2.5 1999/10/19 13:31:28 lhecking Exp $
 *
 */

/* GNUPLOT - png.trm */

/*[
 * Copyright 1995, 1998
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

/*
 * This file is included by ../term.c.
 *
 * This terminal driver supports:
 *  png
 *
 * AUTHORS
 *  Alexander Lehmann	original code,
 *                      derived from pbm.trm by Russell Lang.
 *
 * send your comments or suggestions to (info-gnuplot@dartmouth.edu).
 *
 */

/* To compile this terminal driver, you need libpng and zlib, both are
   available at ftp://ftp.uu.net/graphics/png. Remember to add the
   include dirs and libraries to TERMFLAGS and TERMLIBS. */

/* The following png drivers use the generic bit mapped graphics
   routines from bitmap.c to build up a bit map in memory.  The driver
   interchanges colomns and lines in order to access entire lines
   easily and returns the lines to get bits in the right order :
   (x,y) -> (y,XMAX-1-x). */
/* This interchange is done by calling b_makebitmap() with reversed
   xmax and ymax, and then setting b_rastermode to TRUE.  b_setpixel()
   will then perform the interchange before each pixel is plotted */

#include "driver.h"

#ifdef TERM_REGISTER
register_term(png_driver)
#endif

#ifdef TERM_PROTO
TERM_PUBLIC void PNG_options __PROTO((void));
TERM_PUBLIC void PNG_init __PROTO((void));
TERM_PUBLIC void PNG_reset __PROTO((void));
TERM_PUBLIC void PNG_setfont __PROTO((void));
TERM_PUBLIC void PNG_graphics __PROTO((void));
TERM_PUBLIC void PNG_text __PROTO((void));
TERM_PUBLIC void PNG_linetype __PROTO((int linetype));
TERM_PUBLIC void PNG_point __PROTO((unsigned int x, unsigned int y, int point));
#endif /* TERM_PROTO */

/* make XMAX and YMAX a multiple of 8 */
#define PNG_XMAX (640)
#define PNG_YMAX (480)
#define PNG_VCHAR (FNT5X9_VCHAR)
#define PNG_HCHAR (FNT5X9_VCHAR)
#define PNG_VTIC FNT5X9_HBITS
#define PNG_HTIC FNT5X9_HBITS

#ifdef TERM_BODY

#include "png.h"

/* I'm not sure exactly which is the first version we work with,
 * but I know that some older ones don't define all the symbols
 * we use
 */

/* png version test now in configure */

static int png_font = 1;	/* small font */
static int png_mode = 0;	/* 0:monochrome 1:gray 2:color */

/* 7=black, 0=white */
static int png_gray[] = { 7, 1, 6, 5, 4, 3, 2, 1, 7 };	/* grays  */
/* bit3=!intensify, bit2=!red, bit1=!green, bit0=!blue */
static int png_color_table[] ={ 15, 8, 3, 5, 6, 4, 2, 1, 11, 13, 14 };	/* colors */
static png_color png_palette[16];

TERM_PUBLIC void
PNG_options()
{
    png_font = 1;	/* small */
    png_mode = 0;

    term_options[0] = NUL;

    while (!END_OF_COMMAND) {
	if (almost_equals(c_token, "s$mall"))
	    png_font = 1;
	else if (almost_equals(c_token, "me$dium"))
	    png_font = 2;
	else if (almost_equals(c_token, "l$arge"))
	    png_font = 3;
	else if (almost_equals(c_token, "mo$nochrome"))
	    png_mode = 0;
	else if (almost_equals(c_token, "g$ray"))
	    png_mode = 1;
	else if (almost_equals(c_token, "c$olor")
		 || almost_equals(c_token, "c$olour"))
	    png_mode = 2;
	else {
	    /* reset to default, since term is already set */
	    png_font = 1;
	    png_mode = 0;
	    int_error("expecting: {small, medium, large}, or {monochrome, gray, color}", c_token);
	}
	c_token++;
    }

    /* setup options string */

    switch (png_font) {
    case 3:
	strcat(term_options, "large");
	break;
    case 2:
	strcat(term_options, "medium");
	break;
    case 1:
    default:
	strcat(term_options, "small");
	break;
    }

    switch (png_mode) {
    case 2:
	strcat(term_options, " color");
	break;
    case 1:
	strcat(term_options, " gray");
	break;
    case 0:
    default:
	strcat(term_options, " monochrome");
	break;
    }

}


TERM_PUBLIC void
PNG_init()
{
    PNG_setfont();		/* HBB 980226: do this here! */
}


TERM_PUBLIC void
PNG_reset()
{
#ifdef VMS
    fflush_binary();
#endif /* VMS */
}


TERM_PUBLIC void
PNG_setfont()
{
    switch (png_font) {
    case 3:
	b_charsize(FNT13X25);
	term->v_char = FNT13X25_VCHAR;
	term->h_char = FNT13X25_HCHAR;
	term->v_tic = FNT13X25_HBITS;
	term->h_tic = FNT13X25_HBITS;
	break;
    case 2:
	b_charsize(FNT9X17);
	term->v_char = FNT9X17_VCHAR;
	term->h_char = FNT9X17_HCHAR;
	term->v_tic = FNT9X17_HBITS;
	term->h_tic = FNT9X17_HBITS;
	break;
    case 1:
    default:
	b_charsize(FNT5X9);
	term->v_char = FNT5X9_VCHAR;
	term->h_char = FNT5X9_HCHAR;
	term->v_tic = FNT5X9_HBITS;
	term->h_tic = FNT5X9_HBITS;
	break;
    }
}


TERM_PUBLIC void
PNG_graphics()
{
    int numplanes = 1;

    switch (png_mode) {
    case 2:
	numplanes = 4;
	break;
    case 1:
	numplanes = 3;
	break;
    case 0:
    default:
	numplanes = 1;
	break;
    }

    /* PNGsetfont(); *//* HBB 980226: do this in init() ! */

    /* rotate plot -90 degrees by reversing XMAX and YMAX and by
       setting b_rastermode to TRUE */
    b_makebitmap((unsigned int) (PNG_YMAX * ysize),
		 (unsigned int) (PNG_XMAX * xsize), numplanes);
    b_rastermode = TRUE;

    if (png_mode != 0)
	b_setlinetype(0);	/* solid lines */
}

TERM_PUBLIC void
PNG_text()
{
    register int x, j, row;
    png_structp png_ptr;
    png_infop info_ptr;
    register int i, value;
    png_bytep prow;
    int mask, plane1, plane2, plane3, plane4;
    int red, green, blue;
    png_text pngtext, *pngtext_copy;
    char text[100];

    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (!png_ptr) {
	b_freebitmap();
	return;
    }
    info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr) {
	png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
	b_freebitmap();
	return;
    }
    prow = malloc(b_ysize);
    if (!prow) {
	png_destroy_write_struct(&png_ptr, &info_ptr);
	b_freebitmap();
	return;
    }
    if (setjmp(png_ptr->jmpbuf)) {
	png_destroy_write_struct(&png_ptr, &info_ptr);
	free(prow);
	b_freebitmap();
	return;
    }

#ifdef __OLD_PNGLIB__
   /* deprecated and no longer necessary */        
    png_info_init(info_ptr);
    png_write_init(png_ptr); */
#endif /* __OLD_PNGLIB__ */

    png_init_io(png_ptr, gpoutfile);

    info_ptr->width = b_ysize;
    info_ptr->height = b_xsize;

    info_ptr->bit_depth = png_mode == 0 ? 1 : 4;
    info_ptr->color_type = png_mode == 2 ? PNG_COLOR_TYPE_PALETTE :
	PNG_COLOR_TYPE_GRAY;
    if (png_mode == 2) {
	info_ptr->valid |= PNG_INFO_PLTE;
	info_ptr->palette = png_palette;
	info_ptr->num_palette = 16;
    }
    if (png_mode != 0) {
	info_ptr->valid |= PNG_INFO_sBIT;
	if (png_mode == 1) {
	    info_ptr->sig_bit.gray = 3;
	    png_set_shift(png_ptr, &(info_ptr->sig_bit));
	} else {
	    info_ptr->sig_bit.red = 2;
	    info_ptr->sig_bit.green = 2;
	    info_ptr->sig_bit.blue = 2;
	}
    }
    info_ptr->interlace_type = 0;
    if (png_mode == 0)
	png_set_invert_mono(png_ptr);

    if (png_mode == 2)
	for (i = 0; i < 16; i++) {
	    red = (i & 4) ? 1 : 3;
	    green = (i & 2) ? 1 : 3;
	    blue = (i & 1) ? 1 : 3;
	    if (i & 8) {
		red--;
		green--;
		blue--;
	    }
	    png_palette[i].red = red * 85;
	    png_palette[i].green = green * 85;
	    png_palette[i].blue = blue * 85;
	}
    sprintf(text, "gnuplot %sversion %s patchlevel %s",
	    OS, version, patchlevel);

    pngtext.compression = -1;
    pngtext.key = "Software";
    pngtext.text = text;
    pngtext.text_length = strlen(text);

    pngtext_copy = malloc(sizeof(*pngtext_copy));
    *pngtext_copy = pngtext;
    info_ptr->num_text = 1;
    info_ptr->text = pngtext_copy;

    png_write_info(png_ptr, info_ptr);

    info_ptr->num_text = 0;
    if (info_ptr->text) free(info_ptr->text);
    info_ptr->text = NULL;

    png_set_packing(png_ptr);

    /* dump bitmap in raster mode */
    for (x = b_xsize - 1; x >= 0; x--) {
	row = (b_ysize / 8) - 1;
	for (j = row; j >= 0; j--) {
	    mask = 0x80;
	    plane1 = (*((*b_p)[j] + x));
	    if (png_mode != 0) {
		plane2 = (*((*b_p)[j + b_psize] + x));
		plane3 = (*((*b_p)[j + b_psize + b_psize] + x));
	    } else {
		plane2 = 0;
		plane3 = 0;
	    }
	    if (png_mode == 2)
		plane4 = (*((*b_p)[j + b_psize + b_psize + b_psize] + x));
	    else
		plane4 = 0;

	    for (i = 0; i < 8; i++) {
		value = 0;
		if (plane1 & mask)
		    value += 1;
		if (plane2 & mask)
		    value += 2;
		if (plane3 & mask)
		    value += 4;
		if (plane4 & mask)
		    value += 8;
		if (png_mode == 1)
		    value = 7 - value;

		prow[(row - j) * 8 + i] = (png_byte) value;
		mask >>= 1;
	    }
	}
	png_write_rows(png_ptr, &prow, 1);
    }

    png_write_end(png_ptr, info_ptr);
    png_destroy_write_struct(&png_ptr, &info_ptr);
    free(prow);
    b_freebitmap();
}


TERM_PUBLIC void
PNG_linetype(linetype)
int linetype;
{
    switch (png_mode) {
    case 2:
	if (linetype >= 9)
	    linetype %= 9;
	b_setvalue(png_color_table[linetype + 2]);
	break;
    case 1:
	if (linetype >= 7)
	    linetype %= 7;
	b_setvalue(png_gray[linetype + 2]);
	break;
    case 0:
    default:
	b_setlinetype(linetype);
	break;
    }
}

TERM_PUBLIC void
PNG_point(x, y, point)
unsigned int x, y;
int point;
{
    if (png_mode == 0)
	line_and_point(x, y, point);
    else
	do_point(x, y, point);
}

#endif /* TERM_BODY */

#ifdef TERM_TABLE

TERM_TABLE_START(png_driver)
    "png",
    "Portable Network Graphics [small medium large] [monochrome gray color]",
    PNG_XMAX, PNG_YMAX, PNG_VCHAR,
    PNG_HCHAR, PNG_VTIC, PNG_HTIC, PNG_options,
    PNG_init, PNG_reset, PNG_text, null_scale,
    PNG_graphics, b_move, b_vector, PNG_linetype,
    b_put_text, b_text_angle, null_justify_text, PNG_point,
    do_arrow, set_font_null,
    0,				/* pointsize */
    TERM_CAN_MULTIPLOT | TERM_BINARY
TERM_TABLE_END(png_driver)

#undef LAST_TERM
#define LAST_TERM png_driver

#endif /* TERM_TABLE */

#ifdef TERM_HELP
START_HELP(png)
"1 png",
"?commands set terminal png",
"?set terminal png",
"?set term png",
"?terminal png",
"?term png",
"?png",
" The `png` terminal driver supports Portable Network Graphics.  To compile it,",
" you will need  the third-party libraries \"libpng\" and \"zlib\"; both are",
" available at ftp://ftp.uu.net/graphics/png.  `png` has two options.",
"",
" Syntax:",
"       set terminal png {small | medium | large}",
"                        {monochrome | gray | color}",
"",
" The defaults are small (fontsize) and monochrome.  Default size of the output",
" is 640*480 pixel."
END_HELP(png)
#endif /* TERM_HELP */