1 /****************************************************************************
2 * RRDtool 1.2rc3 Copyright by Tobi Oetiker, 1997-2005
3 ****************************************************************************
4 * rrd_gfx.c graphics wrapper for rrdtool
5 **************************************************************************/
7 /* #define DEBUG */
9 #ifdef DEBUG
10 # define DPRINT(x) (void)(printf x, printf("\n"))
11 #else
12 # define DPRINT(x)
13 #endif
14 #include "rrd_tool.h"
15 #include <png.h>
16 #include <ft2build.h>
17 #include FT_FREETYPE_H
18 #include FT_GLYPH_H
20 #include "rrd_gfx.h"
21 #include "rrd_afm.h"
23 /* lines are better drawn on the pixle than between pixles */
24 #define LINEOFFSET 0.5
26 typedef struct gfx_char_s *gfx_char;
27 struct gfx_char_s {
28 FT_UInt index; /* glyph index */
29 FT_Vector pos; /* location from baseline in 26.6 */
30 FT_Glyph image; /* glyph bitmap */
31 };
33 typedef struct gfx_string_s *gfx_string;
34 struct gfx_string_s {
35 unsigned int width;
36 unsigned int height;
37 size_t count; /* number of characters */
38 gfx_char glyphs;
39 size_t num_glyphs;
40 FT_BBox bbox;
41 FT_Matrix transform;
42 };
44 /* compute string bbox */
45 static void compute_string_bbox(gfx_string string);
47 /* create a freetype glyph string */
48 gfx_string gfx_string_create ( FT_Face face,
49 const char *text, int rotation, double tabwidth);
51 /* create a freetype glyph string */
52 static void gfx_string_destroy ( gfx_string string );
54 static
55 gfx_node_t *gfx_new_node( gfx_canvas_t *canvas,enum gfx_en type){
56 gfx_node_t *node = art_new(gfx_node_t,1);
57 if (node == NULL) return NULL;
58 node->type = type;
59 node->color = 0x0; /* color of element 0xRRGGBBAA alpha 0xff is solid*/
60 node->size =0.0; /* font size, line width */
61 node->path = NULL; /* path */
62 node->points = 0;
63 node->points_max =0;
64 node->closed_path = 0;
65 node->svp = NULL; /* svp */
66 node->filename = NULL; /* font or image filename */
67 node->text = NULL;
68 node->x = 0.0;
69 node->y = 0.0; /* position */
70 node->angle = 0;
71 node->halign = GFX_H_NULL; /* text alignement */
72 node->valign = GFX_V_NULL; /* text alignement */
73 node->tabwidth = 0.0;
74 node->next = NULL;
75 if (canvas->lastnode != NULL){
76 canvas->lastnode->next = node;
77 }
78 if (canvas->firstnode == NULL){
79 canvas->firstnode = node;
80 }
81 canvas->lastnode = node;
82 return node;
83 }
85 gfx_canvas_t *gfx_new_canvas (void) {
86 gfx_canvas_t *canvas = art_new(gfx_canvas_t,1);
87 canvas->firstnode = NULL;
88 canvas->lastnode = NULL;
89 canvas->imgformat = IF_PNG; /* we default to PNG output */
90 canvas->interlaced = 0;
91 canvas->zoom = 1.0;
92 return canvas;
93 }
95 /* create a new line */
96 gfx_node_t *gfx_new_line(gfx_canvas_t *canvas,
97 double X0, double Y0,
98 double X1, double Y1,
99 double width, gfx_color_t color){
100 return gfx_new_dashed_line(canvas, X0, Y0, X1, Y1, width, color, 0, 0);
101 }
103 gfx_node_t *gfx_new_dashed_line(gfx_canvas_t *canvas,
104 double X0, double Y0,
105 double X1, double Y1,
106 double width, gfx_color_t color,
107 double dash_on, double dash_off){
109 gfx_node_t *node;
110 ArtVpath *vec;
111 node = gfx_new_node(canvas,GFX_LINE);
112 if (node == NULL) return NULL;
113 vec = art_new(ArtVpath, 3);
114 if (vec == NULL) return NULL;
115 vec[0].code = ART_MOVETO_OPEN; vec[0].x=X0+LINEOFFSET; vec[0].y=Y0+LINEOFFSET;
116 vec[1].code = ART_LINETO; vec[1].x=X1+LINEOFFSET; vec[1].y=Y1+LINEOFFSET;
117 vec[2].code = ART_END;
119 node->points = 3;
120 node->points_max = 3;
121 node->color = color;
122 node->size = width;
123 node->dash_on = dash_on;
124 node->dash_off = dash_off;
125 node->path = vec;
126 return node;
127 }
129 /* create a new area */
130 gfx_node_t *gfx_new_area (gfx_canvas_t *canvas,
131 double X0, double Y0,
132 double X1, double Y1,
133 double X2, double Y2,
134 gfx_color_t color) {
136 gfx_node_t *node;
137 ArtVpath *vec;
138 node = gfx_new_node(canvas,GFX_AREA);
139 if (node == NULL) return NULL;
140 vec = art_new(ArtVpath, 5);
141 if (vec == NULL) return NULL;
142 vec[0].code = ART_MOVETO; vec[0].x=X0; vec[0].y=Y0;
143 vec[1].code = ART_LINETO; vec[1].x=X1; vec[1].y=Y1;
144 vec[2].code = ART_LINETO; vec[2].x=X2; vec[2].y=Y2;
145 vec[3].code = ART_LINETO; vec[3].x=X0; vec[3].y=Y0;
146 vec[4].code = ART_END;
148 node->points = 5;
149 node->points_max = 5;
150 node->color = color;
151 node->path = vec;
153 return node;
154 }
156 /* add a point to a line or to an area */
157 int gfx_add_point (gfx_node_t *node,
158 double x, double y){
159 if (node == NULL) return 1;
160 if (node->type == GFX_AREA) {
161 double X0 = node->path[0].x;
162 double Y0 = node->path[0].y;
163 node->points -= 2;
164 art_vpath_add_point (&(node->path),
165 &(node->points),
166 &(node->points_max),
167 ART_LINETO,
168 x,y);
169 art_vpath_add_point (&(node->path),
170 &(node->points),
171 &(node->points_max),
172 ART_LINETO,
173 X0,Y0);
174 art_vpath_add_point (&(node->path),
175 &(node->points),
176 &(node->points_max),
177 ART_END,
178 0,0);
179 } else if (node->type == GFX_LINE) {
180 node->points -= 1;
181 art_vpath_add_point (&(node->path),
182 &(node->points),
183 &(node->points_max),
184 ART_LINETO,
185 x+LINEOFFSET,y+LINEOFFSET);
186 art_vpath_add_point (&(node->path),
187 &(node->points),
188 &(node->points_max),
189 ART_END,
190 0,0);
192 } else {
193 /* can only add point to areas and lines */
194 return 1;
195 }
196 return 0;
197 }
199 void gfx_close_path (gfx_node_t *node) {
200 node->closed_path = 1;
201 if (node->path[0].code == ART_MOVETO_OPEN)
202 node->path[0].code = ART_MOVETO;
203 }
205 /* create a text node */
206 gfx_node_t *gfx_new_text (gfx_canvas_t *canvas,
207 double x, double y, gfx_color_t color,
208 char* font, double size,
209 double tabwidth, double angle,
210 enum gfx_h_align_en h_align,
211 enum gfx_v_align_en v_align,
212 char* text){
213 gfx_node_t *node = gfx_new_node(canvas,GFX_TEXT);
215 node->text = strdup(text);
216 node->size = size;
217 node->filename = strdup(font);
218 node->x = x;
219 node->y = y;
220 node->angle = angle;
221 node->color = color;
222 node->tabwidth = tabwidth;
223 node->halign = h_align;
224 node->valign = v_align;
225 #if 0
226 /* debugging: show text anchor
227 green is along x-axis, red is downward y-axis */
228 if (1) {
229 double a = 2 * M_PI * -node->angle / 360.0;
230 double cos_a = cos(a);
231 double sin_a = sin(a);
232 double len = 3;
233 gfx_new_line(canvas,
234 x, y,
235 x + len * cos_a, y - len * sin_a,
236 0.2, 0x00FF0000);
237 gfx_new_line(canvas,
238 x, y,
239 x + len * sin_a, y + len * cos_a,
240 0.2, 0xFF000000);
241 }
242 #endif
243 return node;
244 }
246 int gfx_render(gfx_canvas_t *canvas,
247 art_u32 width, art_u32 height,
248 gfx_color_t background, FILE *fp){
249 switch (canvas->imgformat) {
250 case IF_PNG:
251 return gfx_render_png (canvas, width, height, background, fp);
252 case IF_SVG:
253 return gfx_render_svg (canvas, width, height, background, fp);
254 case IF_EPS:
255 return gfx_render_eps (canvas, width, height, background, fp);
256 case IF_PDF:
257 return gfx_render_pdf (canvas, width, height, background, fp);
258 default:
259 return -1;
260 }
261 }
263 static void gfx_string_destroy ( gfx_string string ) {
264 unsigned int n;
265 if (string->glyphs) {
266 for (n=0; n<string->num_glyphs; ++n)
267 FT_Done_Glyph (string->glyphs[n].image);
268 free (string->glyphs);
269 }
270 free (string);
271 }
274 double gfx_get_text_width ( gfx_canvas_t *canvas,
275 double start, char* font, double size,
276 double tabwidth, char* text, int rotation){
277 switch (canvas->imgformat) {
278 case IF_PNG:
279 return gfx_get_text_width_libart (start, font, size, tabwidth, text, rotation);
280 case IF_SVG: /* fall through */
281 case IF_EPS:
282 case IF_PDF:
283 return afm_get_text_width(start, font, size, tabwidth, text);
284 default:
285 return size * strlen(text);
286 }
287 }
289 double gfx_get_text_width_libart (
290 double start, char* font, double size,
291 double tabwidth, char* text, int rotation){
293 int error;
294 double text_width=0;
295 FT_Face face;
296 FT_Library library=NULL;
297 gfx_string string;
299 FT_Init_FreeType( &library );
300 error = FT_New_Face( library, font, 0, &face );
301 if ( error ) return -1;
302 error = FT_Set_Char_Size(face, size*64,size*64, 100,100);
303 if ( error ) return -1;
305 string = gfx_string_create( face, text, rotation,tabwidth);
306 text_width = string->width;
307 gfx_string_destroy(string);
308 FT_Done_FreeType(library);
309 return text_width/64;
310 }
312 static void gfx_libart_close_path(gfx_node_t *node, ArtVpath **vec)
313 {
314 /* libart must have end==start for closed paths,
315 even if using ART_MOVETO and not ART_MOVETO_OPEN
316 so add extra point which is the same as the starting point */
317 int points_max = node->points; /* scaled array has exact size */
318 int points = node->points - 1;
319 art_vpath_add_point (vec, &points, &points_max, ART_LINETO,
320 (**vec).x, (**vec).y);
321 art_vpath_add_point (vec, &points, &points_max, ART_END, 0, 0);
322 }
324 static void gfx_round_scaled_coordinates(ArtVpath *vec)
325 {
326 while (vec->code != ART_END) {
327 vec->x = floor(vec->x - LINEOFFSET + 0.5) + LINEOFFSET;
328 vec->y = floor(vec->y - LINEOFFSET + 0.5) + LINEOFFSET;
329 vec++;
330 }
331 }
333 /* find bbox of a string */
334 static void compute_string_bbox(gfx_string string) {
335 unsigned int n;
336 FT_BBox bbox;
338 bbox.xMin = bbox.yMin = 32000;
339 bbox.xMax = bbox.yMax = -32000;
340 for ( n = 0; n < string->num_glyphs; n++ ) {
341 FT_BBox glyph_bbox;
342 FT_Glyph_Get_CBox( string->glyphs[n].image, ft_glyph_bbox_gridfit,
343 &glyph_bbox );
344 if (glyph_bbox.xMin < bbox.xMin) {
345 bbox.xMin = glyph_bbox.xMin;
346 }
347 if (glyph_bbox.yMin < bbox.yMin) {
348 bbox.yMin = glyph_bbox.yMin;
349 }
350 if (glyph_bbox.xMax > bbox.xMax) {
351 bbox.xMax = glyph_bbox.xMax;
352 }
353 if (glyph_bbox.yMax > bbox.yMax) {
354 bbox.yMax = glyph_bbox.yMax;
355 }
356 }
357 if ( bbox.xMin > bbox.xMax ) {
358 bbox.xMin = 0;
359 bbox.yMin = 0;
360 bbox.xMax = 0;
361 bbox.yMax = 0;
362 }
363 string->bbox.xMin = bbox.xMin;
364 string->bbox.xMax = bbox.xMax;
365 string->bbox.yMin = bbox.yMin;
366 string->bbox.yMax = bbox.yMax;
367 }
369 /* create a free type glyph string */
370 gfx_string gfx_string_create(FT_Face face,const char *text,
371 int rotation, double tabwidth)
372 {
374 FT_GlyphSlot slot = face->glyph; /* a small shortcut */
375 FT_Bool use_kerning;
376 FT_UInt previous;
377 FT_Vector ft_pen;
379 gfx_string string;
380 gfx_char glyph; /* current glyph in table */
381 unsigned int n;
382 int error;
383 int gottab = 0;
385 ft_pen.x = 0; /* start at (0,0) !! */
386 ft_pen.y = 0;
388 string = (gfx_string) malloc (sizeof(struct gfx_string_s));
389 string->width = 0;
390 string->height = 0;
391 string->count = strlen (text);
392 string->glyphs = (gfx_char) calloc (string->count,sizeof(struct gfx_char_s));
393 string->num_glyphs = 0;
394 string->transform.xx = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
395 string->transform.xy = (FT_Fixed)(-sin(M_PI*(rotation)/180.0)*0x10000);
396 string->transform.yx = (FT_Fixed)( sin(M_PI*(rotation)/180.0)*0x10000);
397 string->transform.yy = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
399 use_kerning = FT_HAS_KERNING(face);
400 previous = 0;
401 glyph = string->glyphs;
402 for (n=0; n<string->count; n++, glyph++) {
403 FT_Vector vec;
404 /* handle the tabs ...
405 have a witespace glyph inserted, but set its width such that the distance
406 of the new right edge is x times tabwidth from 0,0 where x is an integer. */
407 char letter = text[n];
408 gottab = 0;
409 if (letter == '\\' && n+1 < string->count && text[n+1] == 't'){
410 /* we have a tab here so skip the backslash and
411 set t to ' ' so that we get a white space */
412 gottab = 1;
413 n++;
414 letter = ' ';
415 }
416 if (letter == '\t'){
417 letter = ' ';
418 gottab = 1 ;
419 }
420 /* initialize each struct gfx_char_s */
421 glyph->index = 0;
422 glyph->pos.x = 0;
423 glyph->pos.y = 0;
424 glyph->image = NULL;
426 glyph->index = FT_Get_Char_Index( face, letter );
428 /* compute glyph origin */
429 if ( use_kerning && previous && glyph->index ) {
430 FT_Vector kerning;
431 FT_Get_Kerning (face, previous, glyph->index,
432 ft_kerning_default, &kerning);
433 ft_pen.x += kerning.x;
434 ft_pen.y += kerning.y;
435 }
437 /* load the glyph image (in its native format) */
438 /* for now, we take a monochrome glyph bitmap */
439 error = FT_Load_Glyph (face, glyph->index, FT_LOAD_DEFAULT);
440 if (error) {
441 fprintf (stderr, "couldn't load glyph: %c\n", letter);
442 continue;
443 }
444 error = FT_Get_Glyph (slot, &glyph->image);
445 if (error) {
446 fprintf (stderr, "couldn't get glyph from slot: %c\n", letter);
447 continue;
448 }
449 /* if we are in tabbing mode, we replace the tab with a space and shift the position
450 of the space so that its left edge is where the tab was supposed to land us */
451 if (gottab){
452 /* we are in gridfitting mode so the calculations happen in 1/64 pixles */
453 ft_pen.x = tabwidth*64.0 * (float)(1 + (long)(ft_pen.x / (tabwidth * 64.0))) - slot->advance.x;
454 }
455 /* store current pen position */
456 glyph->pos.x = ft_pen.x;
457 glyph->pos.y = ft_pen.y;
460 ft_pen.x += slot->advance.x;
461 ft_pen.y += slot->advance.y;
463 /* rotate glyph */
464 vec = glyph->pos;
465 FT_Vector_Transform (&vec, &string->transform);
466 error = FT_Glyph_Transform (glyph->image, &string->transform, &vec);
467 if (error) {
468 fprintf (stderr, "couldn't transform glyph\n");
469 continue;
470 }
472 /* convert to a bitmap - destroy native image */
473 error = FT_Glyph_To_Bitmap (&glyph->image, FT_RENDER_MODE_NORMAL, 0, 1);
474 if (error) {
475 fprintf (stderr, "couldn't convert glyph to bitmap\n");
476 continue;
477 }
479 /* increment number of glyphs */
480 previous = glyph->index;
481 string->num_glyphs++;
482 }
483 /* printf ("number of glyphs = %d\n", string->num_glyphs);*/
484 compute_string_bbox( string );
485 /* the last character was a tab */
486 if (gottab) {
487 string->width = ft_pen.x;
488 } else {
489 string->width = string->bbox.xMax - string->bbox.xMin;
490 }
491 string->height = string->bbox.yMax - string->bbox.yMin;
492 return string;
493 }
496 static int gfx_save_png (art_u8 *buffer, FILE *fp,
497 long width, long height, long bytes_per_pixel);
498 /* render grafics into png image */
500 int gfx_render_png (gfx_canvas_t *canvas,
501 art_u32 width, art_u32 height,
502 gfx_color_t background, FILE *fp){
505 FT_Library library;
506 gfx_node_t *node = canvas->firstnode;
507 art_u8 red = background >> 24, green = (background >> 16) & 0xff;
508 art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
509 unsigned long pys_width = width * canvas->zoom;
510 unsigned long pys_height = height * canvas->zoom;
511 const int bytes_per_pixel = 3;
512 unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
513 art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
514 art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height);
515 FT_Init_FreeType( &library );
516 while(node){
517 switch (node->type) {
518 case GFX_LINE:
519 case GFX_AREA: {
520 ArtVpath *vec,*pvec;
521 double dst[6];
522 ArtSVP *svp,*usvp,*rsvp;
523 art_affine_scale(dst,canvas->zoom,canvas->zoom);
524 vec = art_vpath_affine_transform(node->path,dst);
525 if (node->closed_path)
526 gfx_libart_close_path(node, &vec);
527 gfx_round_scaled_coordinates(vec);
528 pvec = art_vpath_perturb(vec);
529 art_free(vec);
530 if(node->type == GFX_LINE){
531 svp = art_svp_vpath_stroke ( pvec, ART_PATH_STROKE_JOIN_ROUND,
532 ART_PATH_STROKE_CAP_ROUND,
533 node->size*canvas->zoom,1,1);
534 } else {
535 svp = art_svp_from_vpath ( pvec );
536 }
537 art_free(pvec);
538 usvp=art_svp_uncross(svp);
539 art_free(svp);
540 rsvp=art_svp_rewind_uncrossed(usvp,ART_WIND_RULE_ODDEVEN);
541 art_free(usvp);
542 art_rgb_svp_alpha (rsvp ,0,0, pys_width, pys_height,
543 node->color, buffer, rowstride, NULL);
544 art_free(rsvp);
545 break;
546 }
547 case GFX_TEXT: {
548 unsigned int n;
549 int error;
550 art_u8 fcolor[3],falpha;
551 FT_Face face;
552 gfx_char glyph;
553 gfx_string string;
554 FT_Vector vec; /* 26.6 */
556 float pen_x = 0.0 , pen_y = 0.0;
557 /* double x,y; */
558 long ix,iy,iz;
560 fcolor[0] = node->color >> 24;
561 fcolor[1] = (node->color >> 16) & 0xff;
562 fcolor[2] = (node->color >> 8) & 0xff;
563 falpha = node->color & 0xff;
564 error = FT_New_Face( library,
565 (char *)node->filename,
566 0,
567 &face );
568 if ( error ) break;
570 error = FT_Set_Char_Size(face, /* handle to face object */
571 (long)(node->size*64),
572 (long)(node->size*64),
573 (long)(100*canvas->zoom),
574 (long)(100*canvas->zoom));
575 if ( error ) break;
576 pen_x = node->x * canvas->zoom;
577 pen_y = node->y * canvas->zoom;
579 string = gfx_string_create (face, node->text, node->angle, node->tabwidth);
580 switch(node->halign){
581 case GFX_H_RIGHT: vec.x = -string->bbox.xMax;
582 break;
583 case GFX_H_CENTER: vec.x = abs(string->bbox.xMax) >= abs(string->bbox.xMin) ?
584 -string->bbox.xMax/2:-string->bbox.xMin/2;
585 break;
586 case GFX_H_LEFT: vec.x = -string->bbox.xMin;
587 break;
588 case GFX_H_NULL: vec.x = 0;
589 break;
590 }
592 switch(node->valign){
593 case GFX_V_TOP: vec.y = string->bbox.yMax;
594 break;
595 case GFX_V_CENTER: vec.y = abs(string->bbox.yMax) >= abs(string->bbox.yMin) ?
596 string->bbox.yMax/2:string->bbox.yMin/2;
597 break;
598 case GFX_V_BOTTOM: vec.y = 0;
599 break;
600 case GFX_V_NULL: vec.y = 0;
601 break;
602 }
603 pen_x += vec.x/64;
604 pen_y += vec.y/64;
605 glyph = string->glyphs;
606 for(n=0; n<string->num_glyphs; ++n, ++glyph) {
607 int gr;
608 FT_Glyph image;
609 FT_BitmapGlyph bit;
611 /* make copy to transform */
612 if (! glyph->image) {
613 fprintf (stderr, "no image\n");
614 continue;
615 }
616 error = FT_Glyph_Copy (glyph->image, &image);
617 if (error) {
618 fprintf (stderr, "couldn't copy image\n");
619 continue;
620 }
622 /* transform it */
623 vec = glyph->pos;
624 FT_Vector_Transform (&vec, &string->transform);
626 bit = (FT_BitmapGlyph) image;
628 gr = bit->bitmap.num_grays -1;
629 for (iy=0; iy < bit->bitmap.rows; iy++){
630 long buf_y = iy+(pen_y+0.5)-bit->top;
631 if (buf_y < 0 || buf_y >= (long)pys_height) continue;
632 buf_y *= rowstride;
633 for (ix=0;ix < bit->bitmap.width;ix++){
634 long buf_x = ix + (pen_x + 0.5) + (double)bit->left ;
635 art_u8 font_alpha;
637 if (buf_x < 0 || buf_x >= (long)pys_width) continue;
638 buf_x *= bytes_per_pixel ;
639 font_alpha = *(bit->bitmap.buffer + iy * bit->bitmap.width + ix);
640 font_alpha = (art_u8)((double)font_alpha / gr * falpha);
641 for (iz = 0; iz < 3; iz++){
642 art_u8 *orig = buffer + buf_y + buf_x + iz;
643 *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) +
644 (double)fcolor[iz] / gr * (font_alpha));
645 }
646 }
647 }
648 FT_Done_Glyph (image);
649 }
650 gfx_string_destroy(string);
651 }
652 }
653 node = node->next;
654 }
655 gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
656 art_free(buffer);
657 FT_Done_FreeType( library );
658 return 0;
659 }
661 /* free memory used by nodes this will also remove memory required for
662 associated paths and svcs ... but not for text strings */
663 int
664 gfx_destroy (gfx_canvas_t *canvas){
665 gfx_node_t *next,*node = canvas->firstnode;
666 while(node){
667 next = node->next;
668 art_free(node->path);
669 art_free(node->svp);
670 free(node->text);
671 free(node->filename);
672 art_free(node);
673 node = next;
674 }
675 return 0;
676 }
678 static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){
679 png_structp png_ptr = NULL;
680 png_infop info_ptr = NULL;
681 int i;
682 png_bytep *row_pointers;
683 int rowstride = width * bytes_per_pixel;
684 png_text text[2];
686 if (fp == NULL)
687 return (1);
689 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
690 if (png_ptr == NULL)
691 {
692 return (1);
693 }
694 row_pointers = (png_bytepp)png_malloc(png_ptr,
695 height*sizeof(png_bytep));
697 info_ptr = png_create_info_struct(png_ptr);
699 if (info_ptr == NULL)
700 {
701 png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
702 return (1);
703 }
705 if (setjmp(png_jmpbuf(png_ptr)))
706 {
707 /* If we get here, we had a problem writing the file */
708 png_destroy_write_struct(&png_ptr, &info_ptr);
709 return (1);
710 }
712 png_init_io(png_ptr, fp);
713 png_set_IHDR (png_ptr, info_ptr,width, height,
714 8, PNG_COLOR_TYPE_RGB,
715 PNG_INTERLACE_NONE,
716 PNG_COMPRESSION_TYPE_DEFAULT,
717 PNG_FILTER_TYPE_DEFAULT);
719 text[0].key = "Software";
720 text[0].text = "RRDtool, Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch";
721 text[0].compression = PNG_TEXT_COMPRESSION_NONE;
722 png_set_text (png_ptr, info_ptr, text, 1);
724 /* lets make this fast */
725 png_set_compression_level(png_ptr,1);
726 png_set_filter(png_ptr,PNG_FILTER_TYPE_BASE,PNG_NO_FILTERS);
727 /*
728 png_set_filter(png_ptr,PNG_FILTER_TYPE_BASE,PNG_FILTER_SUB);
729 png_set_compression_strategy(png_ptr,Z_HUFFMAN_ONLY);
730 png_set_compression_level(png_ptr,Z_BEST_SPEED); */
732 /* Write header data */
733 png_write_info (png_ptr, info_ptr);
734 for (i = 0; i < height; i++)
735 row_pointers[i] = (png_bytep) (buffer + i*rowstride);
737 png_write_image(png_ptr, row_pointers);
738 png_write_end(png_ptr, info_ptr);
739 png_destroy_write_struct(&png_ptr, &info_ptr);
740 return 1;
741 }
744 /* ------- SVG -------
745 SVG reference:
746 http://www.w3.org/TR/SVG/
747 */
748 static int svg_indent = 0;
749 static int svg_single_line = 0;
750 static const char *svg_default_font = "Helvetica";
751 typedef struct svg_dash
752 {
753 int dash_enable;
754 double dash_adjust, dash_len, dash_offset;
755 double adjusted_on, adjusted_off;
756 } svg_dash;
759 static void svg_print_indent(FILE *fp)
760 {
761 int i;
762 for (i = svg_indent - svg_single_line; i > 0; i--) {
763 putc(' ', fp);
764 putc(' ', fp);
765 }
766 }
768 static void svg_start_tag(FILE *fp, const char *name)
769 {
770 svg_print_indent(fp);
771 putc('<', fp);
772 fputs(name, fp);
773 svg_indent++;
774 }
776 static void svg_close_tag_single_line(FILE *fp)
777 {
778 svg_single_line++;
779 putc('>', fp);
780 }
782 static void svg_close_tag(FILE *fp)
783 {
784 putc('>', fp);
785 if (!svg_single_line)
786 putc('\n', fp);
787 }
789 static void svg_end_tag(FILE *fp, const char *name)
790 {
791 /* name is NULL if closing empty-node tag */
792 svg_indent--;
793 if (svg_single_line)
794 svg_single_line--;
795 else if (name)
796 svg_print_indent(fp);
797 if (name != NULL) {
798 fputs("</", fp);
799 fputs(name, fp);
800 } else {
801 putc('/', fp);
802 }
803 svg_close_tag(fp);
804 }
806 static void svg_close_tag_empty_node(FILE *fp)
807 {
808 svg_end_tag(fp, NULL);
809 }
811 static void svg_write_text(FILE *fp, const char *text)
812 {
813 const unsigned char *p, *start, *last;
814 unsigned int ch;
815 p = (const unsigned char*)text;
816 if (!p)
817 return;
818 /* trim leading spaces */
819 while (*p == ' ')
820 p++;
821 start = p;
822 /* trim trailing spaces */
823 last = p - 1;
824 while ((ch = *p) != 0) {
825 if (ch != ' ')
826 last = p;
827 p++;
828 }
829 /* encode trimmed text */
830 p = start;
831 while (p <= last) {
832 ch = *p++;
833 ch = afm_host2unicode(ch); /* unsafe macro */
834 switch (ch) {
835 case '&': fputs("&", fp); break;
836 case '<': fputs("<", fp); break;
837 case '>': fputs(">", fp); break;
838 case '"': fputs(""", fp); break;
839 default:
840 if (ch >= 127)
841 fprintf(fp, "&#%d;", ch);
842 else
843 putc(ch, fp);
844 }
845 }
846 }
848 static void svg_format_number(char *buf, int bufsize, double d)
849 {
850 /* omit decimals if integer to reduce filesize */
851 char *p;
852 snprintf(buf, bufsize, "%.2f", d);
853 p = buf; /* doesn't trust snprintf return value */
854 while (*p)
855 p++;
856 while (--p > buf) {
857 char ch = *p;
858 if (ch == '0') {
859 *p = '\0'; /* zap trailing zeros */
860 continue;
861 }
862 if (ch == '.')
863 *p = '\0'; /* zap trailing dot */
864 break;
865 }
866 }
868 static void svg_write_number(FILE *fp, double d)
869 {
870 char buf[60];
871 svg_format_number(buf, sizeof(buf), d);
872 fputs(buf, fp);
873 }
875 static int svg_color_is_black(int c)
876 {
877 /* gfx_color_t is RRGGBBAA */
878 return c == 0x000000FF;
879 }
881 static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
882 {
883 /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
884 gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
885 gfx_color_t opacity = c & 0xFF;
886 fprintf(fp, " %s=\"", attr);
887 if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
888 /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
889 fprintf(fp, "#%03lX",
890 ( ((rrggbb >> 8) & 0xF00)
891 | ((rrggbb >> 4) & 0x0F0)
892 | ( rrggbb & 0x00F)));
893 } else {
894 fprintf(fp, "#%06lX", rrggbb);
895 }
896 fputs("\"", fp);
897 if (opacity != 0xFF) {
898 fprintf(fp, " stroke-opacity=\"");
899 svg_write_number(fp, opacity / 255.0);
900 fputs("\"", fp);
901 }
902 }
904 static void svg_get_dash(gfx_node_t *node, svg_dash *d)
905 {
906 double offset;
907 int mult;
908 if (node->dash_on <= 0 || node->dash_off <= 0) {
909 d->dash_enable = 0;
910 return;
911 }
912 d->dash_enable = 1;
913 d->dash_len = node->dash_on + node->dash_off;
914 /* dash on/off adjustment due to round caps */
915 d->dash_adjust = 0.8 * node->size;
916 d->adjusted_on = node->dash_on - d->dash_adjust;
917 if (d->adjusted_on < 0.01)
918 d->adjusted_on = 0.01;
919 d->adjusted_off = d->dash_len - d->adjusted_on;
920 /* dash offset calc */
921 if (node->path[0].x == node->path[1].x) /* only good for horz/vert lines */
922 offset = node->path[0].y;
923 else
924 offset = node->path[0].x;
925 mult = (int)fabs(offset / d->dash_len);
926 d->dash_offset = offset - mult * d->dash_len;
927 if (node->path[0].x < node->path[1].x || node->path[0].y < node->path[1].y)
928 d->dash_offset = d->dash_len - d->dash_offset;
929 }
931 static int svg_dash_equal(svg_dash *a, svg_dash *b)
932 {
933 if (a->dash_enable != b->dash_enable)
934 return 0;
935 if (a->adjusted_on != b->adjusted_on)
936 return 0;
937 if (a->adjusted_off != b->adjusted_off)
938 return 0;
939 /* rest of properties will be the same when on+off are */
940 return 1;
941 }
943 static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
944 {
945 svg_dash dash_info;
946 svg_get_dash(node, &dash_info);
947 fputs(" stroke-width=\"", fp);
948 svg_write_number(fp, node->size);
949 fputs("\"", fp);
950 svg_write_color(fp, node->color, "stroke");
951 fputs(" fill=\"none\"", fp);
952 if (dash_info.dash_enable) {
953 if (dash_info.dash_offset != 0) {
954 fputs(" stroke-dashoffset=\"", fp);
955 svg_write_number(fp, dash_info.dash_offset);
956 fputs("\"", fp);
957 }
958 fputs(" stroke-dasharray=\"", fp);
959 svg_write_number(fp, dash_info.adjusted_on);
960 fputs(",", fp);
961 svg_write_number(fp, dash_info.adjusted_off);
962 fputs("\"", fp);
963 }
964 }
966 static int svg_is_int_step(double a, double b)
967 {
968 double diff = fabs(a - b);
969 return floor(diff) == diff;
970 }
972 static int svg_path_straight_segment(FILE *fp,
973 double lastA, double currentA, double currentB,
974 gfx_node_t *node,
975 int segment_idx, int isx, char absChar, char relChar)
976 {
977 if (!svg_is_int_step(lastA, currentA)) {
978 putc(absChar, fp);
979 svg_write_number(fp, currentA);
980 return 0;
981 }
982 if (segment_idx < node->points - 1) {
983 ArtVpath *vec = node->path + segment_idx + 1;
984 if (vec->code == ART_LINETO) {
985 double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
986 double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
987 if (nextB == currentB
988 && ((currentA >= lastA) == (nextA >= currentA))
989 && svg_is_int_step(currentA, nextA)) {
990 return 1; /* skip to next as it is a straight line */
991 }
992 }
993 }
994 putc(relChar, fp);
995 svg_write_number(fp, currentA - lastA);
996 return 0;
997 }
999 static void svg_path(FILE *fp, gfx_node_t *node, int multi)
1000 {
1001 int i;
1002 double lastX = 0, lastY = 0;
1003 /* for straight lines <path..> tags take less space than
1004 <line..> tags because of the efficient packing
1005 in the 'd' attribute */
1006 svg_start_tag(fp, "path");
1007 if (!multi)
1008 svg_common_path_attributes(fp, node);
1009 fputs(" d=\"", fp);
1010 /* specification of the 'd' attribute: */
1011 /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
1012 for (i = 0; i < node->points; i++) {
1013 ArtVpath *vec = node->path + i;
1014 double x = vec->x - LINEOFFSET;
1015 double y = vec->y - LINEOFFSET;
1016 switch (vec->code) {
1017 case ART_MOVETO_OPEN: /* fall-through */
1018 case ART_MOVETO:
1019 putc('M', fp);
1020 svg_write_number(fp, x);
1021 putc(',', fp);
1022 svg_write_number(fp, y);
1023 break;
1024 case ART_LINETO:
1025 /* try optimize filesize by using minimal lineto commands */
1026 /* without introducing rounding errors. */
1027 if (x == lastX) {
1028 if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
1029 continue;
1030 } else if (y == lastY) {
1031 if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
1032 continue;
1033 } else {
1034 putc('L', fp);
1035 svg_write_number(fp, x);
1036 putc(',', fp);
1037 svg_write_number(fp, y);
1038 }
1039 break;
1040 case ART_CURVETO: break; /* unsupported */
1041 case ART_END: break; /* nop */
1042 }
1043 lastX = x;
1044 lastY = y;
1045 }
1046 if (node->closed_path)
1047 fputs(" Z", fp);
1048 fputs("\"", fp);
1049 svg_close_tag_empty_node(fp);
1050 }
1052 static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
1053 {
1054 /* optimize for multiple paths with the same color, penwidth, etc. */
1055 int num = 1;
1056 gfx_node_t *node = *nodeR;
1057 gfx_node_t *next = node->next;
1058 while (next) {
1059 if (next->type != node->type
1060 || next->size != node->size
1061 || next->color != node->color
1062 || next->dash_on != node->dash_on
1063 || next->dash_off != node->dash_off)
1064 break;
1065 next = next->next;
1066 num++;
1067 }
1068 if (num == 1) {
1069 svg_path(fp, node, 0);
1070 return;
1071 }
1072 svg_start_tag(fp, "g");
1073 svg_common_path_attributes(fp, node);
1074 svg_close_tag(fp);
1075 while (num && node) {
1076 svg_path(fp, node, 1);
1077 if (!--num)
1078 break;
1079 node = node->next;
1080 *nodeR = node;
1081 }
1082 svg_end_tag(fp, "g");
1083 }
1085 static void svg_area(FILE *fp, gfx_node_t *node)
1086 {
1087 int i;
1088 double startX = 0, startY = 0;
1089 svg_start_tag(fp, "polygon");
1090 fputs(" ", fp);
1091 svg_write_color(fp, node->color, "fill");
1092 fputs(" points=\"", fp);
1093 for (i = 0; i < node->points; i++) {
1094 ArtVpath *vec = node->path + i;
1095 double x = vec->x - LINEOFFSET;
1096 double y = vec->y - LINEOFFSET;
1097 switch (vec->code) {
1098 case ART_MOVETO_OPEN: /* fall-through */
1099 case ART_MOVETO:
1100 svg_write_number(fp, x);
1101 putc(',', fp);
1102 svg_write_number(fp, y);
1103 startX = x;
1104 startY = y;
1105 break;
1106 case ART_LINETO:
1107 if (i == node->points - 2
1108 && node->path[i + 1].code == ART_END
1109 && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
1110 break; /* poly area always closed, no need for last point */
1111 }
1112 putc(' ', fp);
1113 svg_write_number(fp, x);
1114 putc(',', fp);
1115 svg_write_number(fp, y);
1116 break;
1117 case ART_CURVETO: break; /* unsupported */
1118 case ART_END: break; /* nop */
1119 }
1120 }
1121 fputs("\"", fp);
1122 svg_close_tag_empty_node(fp);
1123 }
1125 static void svg_text(FILE *fp, gfx_node_t *node)
1126 {
1127 double x = node->x - LINEOFFSET;
1128 double y = node->y - LINEOFFSET;
1129 if (node->angle != 0) {
1130 svg_start_tag(fp, "g");
1131 fputs(" transform=\"translate(", fp);
1132 svg_write_number(fp, x);
1133 fputs(",", fp);
1134 svg_write_number(fp, y);
1135 fputs(") rotate(", fp);
1136 svg_write_number(fp, node->angle);
1137 fputs(")\"", fp);
1138 x = y = 0;
1139 svg_close_tag(fp);
1140 }
1141 switch (node->valign) {
1142 case GFX_V_TOP: y += node->size; break;
1143 case GFX_V_CENTER: y += node->size / 3; break;
1144 case GFX_V_BOTTOM: break;
1145 case GFX_V_NULL: break;
1146 }
1147 svg_start_tag(fp, "text");
1148 fputs(" x=\"", fp);
1149 svg_write_number(fp, x);
1150 fputs("\" y=\"", fp);
1151 svg_write_number(fp, y);
1153 /* if (strcmp(node->filename, svg_default_font))
1154 fprintf(fp, " font-family=\"%s\"", node->filename);
1155 */
1156 fputs("\" font-family=\"Helvetica", fp);
1157 fputs("\" font-size=\"", fp);
1158 svg_write_number(fp, node->size);
1159 fputs("\"", fp);
1160 if (!svg_color_is_black(node->color))
1161 svg_write_color(fp, node->color, "fill");
1162 switch (node->halign) {
1163 case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
1164 case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
1165 case GFX_H_LEFT: break;
1166 case GFX_H_NULL: break;
1167 }
1168 svg_close_tag_single_line(fp);
1169 /* support for node->tabwidth missing */
1170 svg_write_text(fp, node->text);
1171 svg_end_tag(fp, "text");
1172 if (node->angle != 0)
1173 svg_end_tag(fp, "g");
1174 }
1176 int gfx_render_svg (gfx_canvas_t *canvas,
1177 art_u32 width, art_u32 height,
1178 gfx_color_t background, FILE *fp){
1179 gfx_node_t *node = canvas->firstnode;
1180 fputs(
1181 "<?xml version=\"1.0\" standalone=\"no\"?>\n"
1182 "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
1183 " \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
1184 "<!--\n"
1185 " SVG file created by RRDtool,\n"
1186 " Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
1187 "\n"
1188 " The width/height attributes in the outhermost svg node\n"
1189 " are just default sizes for the browser which is used\n"
1190 " if the svg file is openened directly without being\n"
1191 " embedded in an html file.\n"
1192 " The viewBox is the local coord system for rrdtool.\n"
1193 "-->\n", fp);
1194 svg_start_tag(fp, "svg");
1195 fputs(" width=\"", fp);
1196 svg_write_number(fp, width * canvas->zoom);
1197 fputs("\" height=\"", fp);
1198 svg_write_number(fp, height * canvas->zoom);
1199 fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
1200 svg_write_number(fp, -LINEOFFSET);
1201 fputs(" ", fp);
1202 svg_write_number(fp, -LINEOFFSET);
1203 fputs(" ", fp);
1204 svg_write_number(fp, width - LINEOFFSET);
1205 fputs(" ", fp);
1206 svg_write_number(fp, height - LINEOFFSET);
1207 fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
1208 fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
1209 fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
1210 svg_close_tag(fp);
1211 svg_start_tag(fp, "rect");
1212 fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
1213 svg_write_color(fp, background, "fill");
1214 svg_close_tag_empty_node(fp);
1215 while (node) {
1216 switch (node->type) {
1217 case GFX_LINE:
1218 svg_multi_path(fp, &node);
1219 break;
1220 case GFX_AREA:
1221 svg_area(fp, node);
1222 break;
1223 case GFX_TEXT:
1224 svg_text(fp, node);
1225 }
1226 node = node->next;
1227 }
1228 svg_end_tag(fp, "svg");
1229 return 0;
1230 }
1232 /* ------- EPS -------
1233 EPS and Postscript references:
1234 http://partners.adobe.com/asn/developer/technotes/postscript.html
1235 */
1237 typedef struct eps_font
1238 {
1239 const char *ps_font;
1240 int id;
1241 struct eps_font *next;
1242 } eps_font;
1244 typedef struct eps_state
1245 {
1246 FILE *fp;
1247 gfx_canvas_t *canvas;
1248 art_u32 page_width, page_height;
1249 eps_font *font_list;
1250 /*--*/
1251 gfx_color_t color;
1252 const char *font;
1253 double font_size;
1254 double line_width;
1255 int linecap, linejoin;
1256 int has_dash;
1257 } eps_state;
1259 static void eps_set_color(eps_state *state, gfx_color_t color)
1260 {
1261 /* gfx_color_t is RRGGBBAA */
1262 if (state->color == color)
1263 return;
1264 fprintf(state->fp, "%d %d %d Rgb\n",
1265 (int)((color >> 24) & 255),
1266 (int)((color >> 16) & 255),
1267 (int)((color >> 8) & 255));
1268 state->color = color;
1269 }
1271 static int eps_add_font(eps_state *state, gfx_node_t *node)
1272 {
1273 /* The fonts list could be postponed to the end using
1274 (atend), but let's be nice and have them in the header. */
1275 const char *ps_font = afm_get_font_postscript_name(node->filename);
1276 eps_font *ef;
1277 for (ef = state->font_list; ef; ef = ef->next) {
1278 if (!strcmp(ps_font, ef->ps_font))
1279 return 0;
1280 }
1281 ef = malloc(sizeof(eps_font));
1282 if (ef == NULL) {
1283 rrd_set_error("malloc for eps_font");
1284 return -1;
1285 }
1286 ef->next = state->font_list;
1287 ef->ps_font = ps_font;
1288 state->font_list = ef;
1289 return 0;
1290 }
1292 static void eps_list_fonts(eps_state *state, const char *dscName)
1293 {
1294 eps_font *ef;
1295 int lineLen = strlen(dscName);
1296 if (!state->font_list)
1297 return;
1298 fputs(dscName, state->fp);
1299 for (ef = state->font_list; ef; ef = ef->next) {
1300 int nameLen = strlen(ef->ps_font);
1301 if (lineLen + nameLen > 100 && lineLen) {
1302 fputs("\n", state->fp);
1303 fputs("%%- \n", state->fp);
1304 lineLen = 5;
1305 } else {
1306 fputs(" ", state->fp);
1307 lineLen++;
1308 }
1309 fputs(ef->ps_font, state->fp);
1310 lineLen += nameLen;
1311 }
1312 fputs("\n", state->fp);
1313 }
1315 static void eps_define_fonts(eps_state *state)
1316 {
1317 eps_font *ef;
1318 if (!state->font_list)
1319 return;
1320 for (ef = state->font_list; ef; ef = ef->next) {
1321 /* PostScript¨ LANGUAGE REFERENCE third edition
1322 page 349 */
1323 fprintf(state->fp,
1324 "%%\n"
1325 "/%s findfont dup length dict begin\n"
1326 "{ 1 index /FID ne {def} {pop pop} ifelse } forall\n"
1327 "/Encoding ISOLatin1Encoding def\n"
1328 "currentdict end\n"
1329 "/%s-ISOLatin1 exch definefont pop\n"
1330 "/SetFont-%s { /%s-ISOLatin1 findfont exch scalefont setfont } bd\n",
1331 ef->ps_font, ef->ps_font, ef->ps_font, ef->ps_font);
1332 }
1333 }
1335 static int eps_prologue(eps_state *state)
1336 {
1337 gfx_node_t *node;
1338 fputs(
1339 "%!PS-Adobe-3.0 EPSF-3.0\n"
1340 "%%Creator: RRDtool 1.2rc3 Tobias Oetiker, http://tobi.oetiker.ch\n"
1341 /* can't like weird chars here */
1342 "%%Title: (RRDtool output)\n"
1343 "%%DocumentData: Clean7Bit\n"
1344 "", state->fp);
1345 fprintf(state->fp, "%%%%BoundingBox: 0 0 %d %d\n",
1346 state->page_width, state->page_height);
1347 for (node = state->canvas->firstnode; node; node = node->next) {
1348 if (node->type == GFX_TEXT && eps_add_font(state, node) == -1)
1349 return -1;
1350 }
1351 eps_list_fonts(state, "%%DocumentFonts:");
1352 eps_list_fonts(state, "%%DocumentNeededFonts:");
1353 fputs(
1354 "%%EndComments\n"
1355 "%%BeginProlog\n"
1356 "%%EndProlog\n" /* must have, or BoundingBox is ignored */
1357 "/bd { bind def } bind def\n"
1358 "", state->fp);
1359 fprintf(state->fp, "/X { %.2f add } bd\n", LINEOFFSET);
1360 fputs(
1361 "/X2 {X exch X exch} bd\n"
1362 "/M {X2 moveto} bd\n"
1363 "/L {X2 lineto} bd\n"
1364 "/m {moveto} bd\n"
1365 "/l {lineto} bd\n"
1366 "/S {stroke} bd\n"
1367 "/CP {closepath} bd\n"
1368 "/WS {setlinewidth stroke} bd\n"
1369 "/F {fill} bd\n"
1370 "/TaL { } bd\n"
1371 "/TaC {dup stringwidth pop neg 2 div 0 rmoveto } bd\n"
1372 "/TaR {dup stringwidth pop neg 0 rmoveto } bd\n"
1373 "/TL {moveto TaL show} bd\n"
1374 "/TC {moveto TaC show} bd\n"
1375 "/TR {moveto TaR show} bd\n"
1376 "/Rgb { 255.0 div 3 1 roll\n"
1377 " 255.0 div 3 1 roll \n"
1378 " 255.0 div 3 1 roll setrgbcolor } bd\n"
1379 "", state->fp);
1380 eps_define_fonts(state);
1381 return 0;
1382 }
1384 static void eps_clear_dash(eps_state *state)
1385 {
1386 if (!state->has_dash)
1387 return;
1388 state->has_dash = 0;
1389 fputs("[1 0] 0 setdash\n", state->fp);
1390 }
1392 static void eps_write_linearea(eps_state *state, gfx_node_t *node)
1393 {
1394 int i;
1395 FILE *fp = state->fp;
1396 int useOffset = 0;
1397 int clearDashIfAny = 1;
1398 eps_set_color(state, node->color);
1399 if (node->type == GFX_LINE) {
1400 svg_dash dash_info;
1401 if (state->linecap != 1) {
1402 fputs("1 setlinecap\n", fp);
1403 state->linecap = 1;
1404 }
1405 if (state->linejoin != 1) {
1406 fputs("1 setlinejoin\n", fp);
1407 state->linejoin = 1;
1408 }
1409 svg_get_dash(node, &dash_info);
1410 if (dash_info.dash_enable) {
1411 clearDashIfAny = 0;
1412 state->has_dash = 1;
1413 fputs("[", fp);
1414 svg_write_number(fp, dash_info.adjusted_on);
1415 fputs(" ", fp);
1416 svg_write_number(fp, dash_info.adjusted_off);
1417 fputs("] ", fp);
1418 svg_write_number(fp, dash_info.dash_offset);
1419 fputs(" setdash\n", fp);
1420 }
1421 }
1422 if (clearDashIfAny)
1423 eps_clear_dash(state);
1424 for (i = 0; i < node->points; i++) {
1425 ArtVpath *vec = node->path + i;
1426 double x = vec->x;
1427 double y = state->page_height - vec->y;
1428 if (vec->code == ART_MOVETO_OPEN || vec->code == ART_MOVETO)
1429 useOffset = (fabs(x - floor(x) - 0.5) < 0.01 && fabs(y - floor(y) - 0.5) < 0.01);
1430 if (useOffset) {
1431 x -= LINEOFFSET;
1432 y -= LINEOFFSET;
1433 }
1434 switch (vec->code) {
1435 case ART_MOVETO_OPEN: /* fall-through */
1436 case ART_MOVETO:
1437 svg_write_number(fp, x);
1438 fputc(' ', fp);
1439 svg_write_number(fp, y);
1440 fputc(' ', fp);
1441 fputs(useOffset ? "M\n" : "m\n", fp);
1442 break;
1443 case ART_LINETO:
1444 svg_write_number(fp, x);
1445 fputc(' ', fp);
1446 svg_write_number(fp, y);
1447 fputc(' ', fp);
1448 fputs(useOffset ? "L\n" : "l\n", fp);
1449 break;
1450 case ART_CURVETO: break; /* unsupported */
1451 case ART_END: break; /* nop */
1452 }
1453 }
1454 if (node->type == GFX_LINE) {
1455 if (node->closed_path)
1456 fputs("CP ", fp);
1457 if (node->size != state->line_width) {
1458 state->line_width = node->size;
1459 svg_write_number(fp, state->line_width);
1460 fputs(" WS\n", fp);
1461 } else {
1462 fputs("S\n", fp);
1463 }
1464 } else {
1465 fputs("F\n", fp);
1466 }
1467 }
1469 static void eps_write_text(eps_state *state, gfx_node_t *node)
1470 {
1471 FILE *fp = state->fp;
1472 const unsigned char *p;
1473 const char *ps_font = afm_get_font_postscript_name(node->filename);
1474 char align = 'L';
1475 double x = node->x;
1476 double y = state->page_height - node->y, ydelta = 0;
1477 int lineLen = 0;
1478 eps_set_color(state, node->color);
1479 if (strcmp(ps_font, state->font) || node->size != state->font_size) {
1480 state->font = ps_font;
1481 state->font_size = node->size;
1482 svg_write_number(fp, state->font_size);
1483 fprintf(fp, " SetFont-%s\n", state->font);
1484 }
1485 fputs("(", fp);
1486 lineLen = 20;
1487 for (p = (const unsigned char*)node->text; *p; p++) {
1488 if (lineLen > 70) {
1489 fputs("\\\n", fp); /* backslash and \n */
1490 lineLen = 0;
1491 }
1492 switch (*p) {
1493 case '(':
1494 case ')':
1495 case '\\':
1496 case '\n':
1497 case '\r':
1498 case '\t':
1499 fputc('\\', fp);
1500 lineLen++;
1501 /* fall-through */
1502 default:
1503 if (*p >= 126)
1504 fprintf(fp, "\\%03o", *p);
1505 else
1506 fputc(*p, fp);
1507 lineLen++;
1508 }
1509 }
1510 fputs(") ", fp);
1511 switch(node->valign){
1512 case GFX_V_TOP: ydelta = -node->size; break;
1513 case GFX_V_CENTER: ydelta = -node->size / 3.0; break;
1514 case GFX_V_BOTTOM: break;
1515 case GFX_V_NULL: break;
1516 }
1517 if (node->angle == 0)
1518 y += ydelta;
1519 switch (node->halign) {
1520 case GFX_H_RIGHT: align = 'R'; break;
1521 case GFX_H_CENTER: align = 'C'; break;
1522 case GFX_H_LEFT: align= 'L'; break;
1523 case GFX_H_NULL: align= 'L'; break;
1524 }
1525 if (node->angle != 0) {
1526 fputs("\n", fp);
1527 fputs(" gsave ", fp);
1528 svg_write_number(fp, x);
1529 fputc(' ', fp);
1530 svg_write_number(fp, y);
1531 fputs(" translate ", fp);
1532 svg_write_number(fp, -node->angle);
1533 fputs(" rotate 0 ", fp);
1534 svg_write_number(fp, ydelta);
1535 fputs(" moveto ", fp);
1536 fprintf(fp, "Ta%c", align);
1537 fputs(" show grestore\n", fp);
1538 } else {
1539 svg_write_number(fp, x);
1540 fputc(' ', fp);
1541 svg_write_number(fp, y);
1542 fputs(" T", fp);
1543 fputc(align, fp);
1544 fputc('\n', fp);
1545 }
1546 }
1548 static int eps_write_content(eps_state *state)
1549 {
1550 gfx_node_t *node;
1551 fputs("%\n", state->fp);
1552 for (node = state->canvas->firstnode; node; node = node->next) {
1553 switch (node->type) {
1554 case GFX_LINE:
1555 case GFX_AREA:
1556 eps_write_linearea(state, node);
1557 break;
1558 case GFX_TEXT:
1559 eps_write_text(state, node);
1560 break;
1561 }
1562 }
1563 return 0;
1564 }
1566 int gfx_render_eps (gfx_canvas_t *canvas,
1567 art_u32 width, art_u32 height,
1568 gfx_color_t background, FILE *fp){
1569 struct eps_state state;
1570 state.fp = fp;
1571 state.canvas = canvas;
1572 state.page_width = width;
1573 state.page_height = height;
1574 state.font = "no-default-font";
1575 state.font_size = -1;
1576 state.color = 0; /* black */
1577 state.font_list = NULL;
1578 state.linecap = -1;
1579 state.linejoin = -1;
1580 state.has_dash = 0;
1581 if (eps_prologue(&state) == -1)
1582 return -1;
1583 eps_set_color(&state, background);
1584 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1585 height, width, height, width);
1586 if (eps_write_content(&state) == -1)
1587 return 0;
1588 fputs("showpage\n", fp);
1589 fputs("%%EOF\n", fp);
1590 while (state.font_list) {
1591 eps_font *next = state.font_list->next;
1592 free(state.font_list);
1593 state.font_list = next;
1594 }
1595 return 0;
1596 }
1598 /* ------- PDF -------
1599 PDF references page:
1600 http://partners.adobe.com/asn/developer/technotes/acrobatpdf.html
1601 */
1603 typedef struct pdf_buffer
1604 {
1605 int id, is_obj, is_dict, is_stream, pdf_file_pos;
1606 char *data;
1607 int alloc_size, current_size;
1608 struct pdf_buffer *previous_buffer, *next_buffer;
1609 struct pdf_state *state;
1610 } pdf_buffer;
1612 typedef struct pdf_font
1613 {
1614 const char *ps_font;
1615 pdf_buffer obj;
1616 struct pdf_font *next;
1617 } pdf_font;
1619 typedef struct pdf_state
1620 {
1621 FILE *fp;
1622 gfx_canvas_t *canvas;
1623 art_u32 page_width, page_height;
1624 pdf_font *font_list;
1625 pdf_buffer *first_buffer, *last_buffer;
1626 int pdf_file_pos;
1627 int has_failed;
1628 /*--*/
1629 gfx_color_t stroke_color, fill_color;
1630 int font_id;
1631 double font_size;
1632 double line_width;
1633 svg_dash dash;
1634 int linecap, linejoin;
1635 int last_obj_id;
1636 /*--*/
1637 pdf_buffer pdf_header;
1638 pdf_buffer catalog_obj, pages_obj, page1_obj;
1639 pdf_buffer fontsdict_obj;
1640 pdf_buffer graph_stream;
1641 } pdf_state;
1643 static void pdf_init_buffer(pdf_state *state, pdf_buffer *buf)
1644 {
1645 int initial_size = 32;
1646 buf->state = state;
1647 buf->id = -42;
1648 buf->alloc_size = 0;
1649 buf->current_size = 0;
1650 buf->data = (char*)malloc(initial_size);
1651 buf->is_obj = 0;
1652 buf->previous_buffer = NULL;
1653 buf->next_buffer = NULL;
1654 if (buf->data == NULL) {
1655 rrd_set_error("malloc for pdf_buffer data");
1656 state->has_failed = 1;
1657 return;
1658 }
1659 buf->alloc_size = initial_size;
1660 if (state->last_buffer)
1661 state->last_buffer->next_buffer = buf;
1662 if (state->first_buffer == NULL)
1663 state->first_buffer = buf;
1664 buf->previous_buffer = state->last_buffer;
1665 state->last_buffer = buf;
1666 }
1668 static void pdf_put(pdf_buffer *buf, const char *text, int len)
1669 {
1670 if (len <= 0)
1671 return;
1672 if (buf->alloc_size < buf->current_size + len) {
1673 int new_size = buf->alloc_size;
1674 char *new_buf;
1675 while (new_size < buf->current_size + len)
1676 new_size *= 4;
1677 new_buf = (char*)malloc(new_size);
1678 if (new_buf == NULL) {
1679 rrd_set_error("re-malloc for pdf_buffer data");
1680 buf->state->has_failed = 1;
1681 return;
1682 }
1683 memcpy(new_buf, buf->data, buf->current_size);
1684 free(buf->data);
1685 buf->data = new_buf;
1686 buf->alloc_size = new_size;
1687 }
1688 memcpy(buf->data + buf->current_size, text, len);
1689 buf->current_size += len;
1690 }
1692 static void pdf_puts(pdf_buffer *buf, const char *text)
1693 {
1694 pdf_put(buf, text, strlen(text));
1695 }
1697 static void pdf_indent(pdf_buffer *buf)
1698 {
1699 pdf_puts(buf, "\t");
1700 }
1702 static void pdf_putsi(pdf_buffer *buf, const char *text)
1703 {
1704 pdf_indent(buf);
1705 pdf_puts(buf, text);
1706 }
1708 static void pdf_putint(pdf_buffer *buf, int i)
1709 {
1710 char tmp[20];
1711 sprintf(tmp, "%d", i);
1712 pdf_puts(buf, tmp);
1713 }
1715 static void pdf_putnumber(pdf_buffer *buf, double d)
1716 {
1717 char tmp[50];
1718 svg_format_number(tmp, sizeof(tmp), d);
1719 pdf_puts(buf, tmp);
1720 }
1722 static void pdf_init_object(pdf_state *state, pdf_buffer *buf)
1723 {
1724 pdf_init_buffer(state, buf);
1725 buf->id = ++state->last_obj_id;
1726 buf->is_obj = 1;
1727 buf->is_stream = 0;
1728 }
1730 static void pdf_init_dict(pdf_state *state, pdf_buffer *buf)
1731 {
1732 pdf_init_object(state, buf);
1733 buf->is_dict = 1;
1734 }
1736 static void pdf_set_color(pdf_buffer *buf, gfx_color_t color,
1737 gfx_color_t *current_color, const char *op)
1738 {
1739 /* gfx_color_t is RRGGBBAA */
1740 if (*current_color == color)
1741 return;
1742 pdf_putnumber(buf, ((color >> 24) & 255) / 255.0);
1743 pdf_puts(buf, " ");
1744 pdf_putnumber(buf, ((color >> 16) & 255) / 255.0);
1745 pdf_puts(buf, " ");
1746 pdf_putnumber(buf, ((color >> 8) & 255) / 255.0);
1747 pdf_puts(buf, " ");
1748 pdf_puts(buf, op);
1749 pdf_puts(buf, "\n");
1750 *current_color = color;
1751 }
1753 static void pdf_set_stroke_color(pdf_buffer *buf, gfx_color_t color)
1754 {
1755 pdf_set_color(buf, color, &buf->state->stroke_color, "RG");
1756 }
1758 static void pdf_set_fill_color(pdf_buffer *buf, gfx_color_t color)
1759 {
1760 pdf_set_color(buf, color, &buf->state->fill_color, "rg");
1761 }
1763 static pdf_font *pdf_find_font(pdf_state *state, gfx_node_t *node)
1764 {
1765 const char *ps_font = afm_get_font_postscript_name(node->filename);
1766 pdf_font *ef;
1767 for (ef = state->font_list; ef; ef = ef->next) {
1768 if (!strcmp(ps_font, ef->ps_font))
1769 return ef;
1770 }
1771 return NULL;
1772 }
1774 static void pdf_add_font(pdf_state *state, gfx_node_t *node)
1775 {
1776 pdf_font *ef = pdf_find_font(state, node);
1777 if (ef)
1778 return;
1779 ef = malloc(sizeof(pdf_font));
1780 if (ef == NULL) {
1781 rrd_set_error("malloc for pdf_font");
1782 state->has_failed = 1;
1783 return;
1784 }
1785 pdf_init_dict(state, &ef->obj);
1786 ef->next = state->font_list;
1787 ef->ps_font = afm_get_font_postscript_name(node->filename);
1788 state->font_list = ef;
1789 /* fonts dict */
1790 pdf_putsi(&state->fontsdict_obj, "/F");
1791 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1792 pdf_puts(&state->fontsdict_obj, " ");
1793 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1794 pdf_puts(&state->fontsdict_obj, " 0 R\n");
1795 /* fonts def */
1796 pdf_putsi(&ef->obj, "/Type /Font\n");
1797 pdf_putsi(&ef->obj, "/Subtype /Type1\n");
1798 pdf_putsi(&ef->obj, "/Name /F");
1799 pdf_putint(&ef->obj, ef->obj.id);
1800 pdf_puts(&ef->obj, "\n");
1801 pdf_putsi(&ef->obj, "/BaseFont /");
1802 pdf_puts(&ef->obj, ef->ps_font);
1803 pdf_puts(&ef->obj, "\n");
1804 pdf_putsi(&ef->obj, "/Encoding /WinAnsiEncoding\n");
1805 /* 'Cp1252' (this is latin 1 extended with 27 characters;
1806 the encoding is also known as 'winansi')
1807 http://www.lowagie.com/iText/tutorial/ch09.html */
1808 }
1810 static void pdf_create_fonts(pdf_state *state)
1811 {
1812 gfx_node_t *node;
1813 for (node = state->canvas->firstnode; node; node = node->next) {
1814 if (node->type == GFX_TEXT)
1815 pdf_add_font(state, node);
1816 }
1817 }
1819 static void pdf_write_linearea(pdf_state *state, gfx_node_t *node)
1820 {
1821 int i;
1822 pdf_buffer *s = &state->graph_stream;
1823 if (node->type == GFX_LINE) {
1824 svg_dash dash_info;
1825 svg_get_dash(node, &dash_info);
1826 if (!svg_dash_equal(&dash_info, &state->dash)) {
1827 state->dash = dash_info;
1828 if (dash_info.dash_enable) {
1829 pdf_puts(s, "[");
1830 pdf_putnumber(s, dash_info.adjusted_on);
1831 pdf_puts(s, " ");
1832 pdf_putnumber(s, dash_info.adjusted_off);
1833 pdf_puts(s, "] ");
1834 pdf_putnumber(s, dash_info.dash_offset);
1835 pdf_puts(s, " d\n");
1836 } else {
1837 pdf_puts(s, "[] 0 d\n");
1838 }
1839 }
1840 pdf_set_stroke_color(s, node->color);
1841 if (state->linecap != 1) {
1842 pdf_puts(s, "1 j\n");
1843 state->linecap = 1;
1844 }
1845 if (state->linejoin != 1) {
1846 pdf_puts(s, "1 J\n");
1847 state->linejoin = 1;
1848 }
1849 if (node->size != state->line_width) {
1850 state->line_width = node->size;
1851 pdf_putnumber(s, state->line_width);
1852 pdf_puts(s, " w\n");
1853 }
1854 } else {
1855 pdf_set_fill_color(s, node->color);
1856 }
1857 for (i = 0; i < node->points; i++) {
1858 ArtVpath *vec = node->path + i;
1859 double x = vec->x;
1860 double y = state->page_height - vec->y;
1861 if (node->type == GFX_AREA) {
1862 x += LINEOFFSET; /* adjust for libart handling of areas */
1863 y -= LINEOFFSET;
1864 }
1865 switch (vec->code) {
1866 case ART_MOVETO_OPEN: /* fall-through */
1867 case ART_MOVETO:
1868 pdf_putnumber(s, x);
1869 pdf_puts(s, " ");
1870 pdf_putnumber(s, y);
1871 pdf_puts(s, " m\n");
1872 break;
1873 case ART_LINETO:
1874 pdf_putnumber(s, x);
1875 pdf_puts(s, " ");
1876 pdf_putnumber(s, y);
1877 pdf_puts(s, " l\n");
1878 break;
1879 case ART_CURVETO: break; /* unsupported */
1880 case ART_END: break; /* nop */
1881 }
1882 }
1883 if (node->type == GFX_LINE) {
1884 pdf_puts(s, node->closed_path ? "s\n" : "S\n");
1885 } else {
1886 pdf_puts(s, "f\n");
1887 }
1888 }
1890 static void pdf_write_text(pdf_state *state, gfx_node_t *node,
1891 int last_was_text, int next_is_text)
1892 {
1893 char tmp[30];
1894 pdf_buffer *s = &state->graph_stream;
1895 const unsigned char *p;
1896 pdf_font *font = pdf_find_font(state, node);
1897 double x = node->x;
1898 double y = state->page_height - node->y;
1899 double dx = 0, dy = 0;
1900 double cos_a = 0, sin_a = 0;
1901 if (font == NULL) {
1902 rrd_set_error("font disappeared");
1903 state->has_failed = 1;
1904 return;
1905 }
1906 switch(node->valign){
1907 case GFX_V_TOP: dy = -node->size; break;
1908 case GFX_V_CENTER: dy = -node->size / 3.0; break;
1909 case GFX_V_BOTTOM: break;
1910 case GFX_V_NULL: break;
1911 }
1912 switch (node->halign) {
1913 case GFX_H_RIGHT: dx = -afm_get_text_width(0, font->ps_font,
1914 node->size, node->tabwidth, node->text);
1915 break;
1916 case GFX_H_CENTER: dx = -afm_get_text_width(0, font->ps_font,
1917 node->size, node->tabwidth, node->text) / 2;
1918 break;
1919 case GFX_H_LEFT: break;
1920 case GFX_H_NULL: break;
1921 }
1922 pdf_set_fill_color(s, node->color);
1923 if (node->angle != 0) {
1924 double a = 2 * M_PI * -node->angle / 360.0;
1925 double new_x, new_y;
1926 cos_a = cos(a);
1927 sin_a = sin(a);
1928 new_x = cos_a * dx - sin_a * dy + x;
1929 new_y = sin_a * dx + cos_a * dy + y;
1930 x = new_x;
1931 y = new_y;
1932 } else {
1933 x += dx;
1934 y += dy;
1935 }
1936 if (!last_was_text)
1937 pdf_puts(s, "BT\n");
1938 if (state->font_id != font->obj.id || node->size != state->font_size) {
1939 state->font_id = font->obj.id;
1940 state->font_size = node->size;
1941 pdf_puts(s, "/F");
1942 pdf_putint(s, font->obj.id);
1943 pdf_puts(s, " ");
1944 pdf_putnumber(s, node->size);
1945 pdf_puts(s, " Tf\n");
1946 }
1947 if (node->angle == 0) {
1948 pdf_puts(s, "1 0 0 1 ");
1949 } else {
1950 pdf_putnumber(s, cos_a);
1951 pdf_puts(s, " ");
1952 pdf_putnumber(s, sin_a);
1953 pdf_puts(s, " ");
1954 pdf_putnumber(s, -sin_a);
1955 pdf_puts(s, " ");
1956 pdf_putnumber(s, cos_a);
1957 pdf_puts(s, " ");
1958 }
1959 pdf_putnumber(s, x);
1960 pdf_puts(s, " ");
1961 pdf_putnumber(s, y);
1962 pdf_puts(s, " Tm\n");
1963 pdf_puts(s, "(");
1964 for (p = (const unsigned char*)node->text; *p; p++) {
1965 switch (*p) {
1966 case '(':
1967 case ')':
1968 case '\\':
1969 case '\n':
1970 case '\r':
1971 case '\t':
1972 pdf_puts(s, "\\");
1973 /* fall-through */
1974 default:
1975 if (*p >= 126) {
1976 snprintf(tmp, sizeof(tmp), "\\%03o", *p);
1977 pdf_puts(s, tmp);
1978 } else {
1979 pdf_put(s, (const char*)p, 1);
1980 }
1981 }
1982 }
1983 pdf_puts(s, ") Tj\n");
1984 if (!next_is_text)
1985 pdf_puts(s, "ET\n");
1986 }
1988 static void pdf_write_content(pdf_state *state)
1989 {
1990 gfx_node_t *node;
1991 int last_was_text = 0, next_is_text;
1992 for (node = state->canvas->firstnode; node; node = node->next) {
1993 switch (node->type) {
1994 case GFX_LINE:
1995 case GFX_AREA:
1996 pdf_write_linearea(state, node);
1997 break;
1998 case GFX_TEXT:
1999 next_is_text = node->next && node->next->type == GFX_TEXT;
2000 pdf_write_text(state, node, last_was_text, next_is_text);
2001 break;
2002 }
2003 last_was_text = node->type == GFX_TEXT;
2004 }
2005 }
2007 static void pdf_init_document(pdf_state *state)
2008 {
2009 pdf_init_buffer(state, &state->pdf_header);
2010 pdf_init_dict(state, &state->catalog_obj);
2011 pdf_init_dict(state, &state->pages_obj);
2012 pdf_init_dict(state, &state->page1_obj);
2013 pdf_init_dict(state, &state->fontsdict_obj);
2014 pdf_create_fonts(state);
2015 if (state->has_failed)
2016 return;
2017 /* make stream last object in file */
2018 pdf_init_object(state, &state->graph_stream);
2019 state->graph_stream.is_stream = 1;
2020 }
2022 static void pdf_setup_document(pdf_state *state)
2023 {
2024 /* all objects created by now, so init code can reference them */
2025 /* HEADER */
2026 pdf_puts(&state->pdf_header, "%PDF-1.3\n");
2027 /* following 8 bit comment is recommended by Adobe for
2028 indicating binary file to file transfer applications */
2029 pdf_puts(&state->pdf_header, "%\xE2\xE3\xCF\xD3\n");
2030 /* CATALOG */
2031 pdf_putsi(&state->catalog_obj, "/Type /Catalog\n");
2032 pdf_putsi(&state->catalog_obj, "/Pages ");
2033 pdf_putint(&state->catalog_obj, state->pages_obj.id);
2034 pdf_puts(&state->catalog_obj, " 0 R\n");
2035 /* PAGES */
2036 pdf_putsi(&state->pages_obj, "/Type /Pages\n");
2037 pdf_putsi(&state->pages_obj, "/Kids [");
2038 pdf_putint(&state->pages_obj, state->page1_obj.id);
2039 pdf_puts(&state->pages_obj, " 0 R]\n");
2040 pdf_putsi(&state->pages_obj, "/Count 1\n");
2041 /* PAGE 1 */
2042 pdf_putsi(&state->page1_obj, "/Type /Page\n");
2043 pdf_putsi(&state->page1_obj, "/Parent ");
2044 pdf_putint(&state->page1_obj, state->pages_obj.id);
2045 pdf_puts(&state->page1_obj, " 0 R\n");
2046 pdf_putsi(&state->page1_obj, "/MediaBox [0 0 ");
2047 pdf_putint(&state->page1_obj, state->page_width);
2048 pdf_puts(&state->page1_obj, " ");
2049 pdf_putint(&state->page1_obj, state->page_height);
2050 pdf_puts(&state->page1_obj, "]\n");
2051 pdf_putsi(&state->page1_obj, "/Contents ");
2052 pdf_putint(&state->page1_obj, state->graph_stream.id);
2053 pdf_puts(&state->page1_obj, " 0 R\n");
2054 pdf_putsi(&state->page1_obj, "/Resources << /Font ");
2055 pdf_putint(&state->page1_obj, state->fontsdict_obj.id);
2056 pdf_puts(&state->page1_obj, " 0 R >>\n");
2057 }
2059 static void pdf_write_string_to_file(pdf_state *state, const char *text)
2060 {
2061 fputs(text, state->fp);
2062 state->pdf_file_pos += strlen(text);
2063 }
2065 static void pdf_write_buf_to_file(pdf_state *state, pdf_buffer *buf)
2066 {
2067 char tmp[40];
2068 buf->pdf_file_pos = state->pdf_file_pos;
2069 if (buf->is_obj) {
2070 snprintf(tmp, sizeof(tmp), "%d 0 obj\n", buf->id);
2071 pdf_write_string_to_file(state, tmp);
2072 }
2073 if (buf->is_dict)
2074 pdf_write_string_to_file(state, "<<\n");
2075 if (buf->is_stream) {
2076 snprintf(tmp, sizeof(tmp), "<< /Length %d >>\n", buf->current_size);
2077 pdf_write_string_to_file(state, tmp);
2078 pdf_write_string_to_file(state, "stream\n");
2079 }
2080 fwrite(buf->data, 1, buf->current_size, state->fp);
2081 state->pdf_file_pos += buf->current_size;
2082 if (buf->is_stream)
2083 pdf_write_string_to_file(state, "endstream\n");
2084 if (buf->is_dict)
2085 pdf_write_string_to_file(state, ">>\n");
2086 if (buf->is_obj)
2087 pdf_write_string_to_file(state, "endobj\n");
2088 }
2090 static void pdf_write_to_file(pdf_state *state)
2091 {
2092 pdf_buffer *buf = state->first_buffer;
2093 int xref_pos;
2094 state->pdf_file_pos = 0;
2095 pdf_write_buf_to_file(state, &state->pdf_header);
2096 while (buf) {
2097 if (buf->is_obj)
2098 pdf_write_buf_to_file(state, buf);
2099 buf = buf->next_buffer;
2100 }
2101 xref_pos = state->pdf_file_pos;
2102 fprintf(state->fp, "xref\n");
2103 fprintf(state->fp, "%d %d\n", 0, state->last_obj_id + 1);
2104 /* TOC lines must be exactly 20 bytes including \n */
2105 fprintf(state->fp, "%010d %05d f\x20\n", 0, 65535);
2106 for (buf = state->first_buffer; buf; buf = buf->next_buffer) {
2107 if (buf->is_obj)
2108 fprintf(state->fp, "%010d %05d n\x20\n", buf->pdf_file_pos, 0);
2109 }
2110 fprintf(state->fp, "trailer\n");
2111 fprintf(state->fp, "<<\n");
2112 fprintf(state->fp, "\t/Size %d\n", state->last_obj_id + 1);
2113 fprintf(state->fp, "\t/Root %d 0 R\n", state->catalog_obj.id);
2114 fprintf(state->fp, ">>\n");
2115 fprintf(state->fp, "startxref\n");
2116 fprintf(state->fp, "%d\n", xref_pos);
2117 fputs("%%EOF\n", state->fp);
2118 }
2120 static void pdf_free_resources(pdf_state *state)
2121 {
2122 pdf_buffer *buf = state->first_buffer;
2123 while (buf) {
2124 free(buf->data);
2125 buf->data = NULL;
2126 buf->alloc_size = buf->current_size = 0;
2127 buf = buf->next_buffer;
2128 }
2129 while (state->font_list) {
2130 pdf_font *next = state->font_list->next;
2131 free(state->font_list);
2132 state->font_list = next;
2133 }
2134 }
2136 int gfx_render_pdf (gfx_canvas_t *canvas,
2137 art_u32 width, art_u32 height,
2138 gfx_color_t background, FILE *fp){
2139 struct pdf_state state;
2140 memset(&state, 0, sizeof(pdf_state));
2141 state.fp = fp;
2142 state.canvas = canvas;
2143 state.page_width = width;
2144 state.page_height = height;
2145 state.font_id = -1;
2146 state.font_size = -1;
2147 state.font_list = NULL;
2148 state.linecap = -1;
2149 state.linejoin = -1;
2150 pdf_init_document(&state);
2151 /*
2152 pdf_set_color(&state, background);
2153 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
2154 height, width, height, width);
2155 */
2156 if (!state.has_failed)
2157 pdf_write_content(&state);
2158 if (!state.has_failed)
2159 pdf_setup_document(&state);
2160 if (!state.has_failed)
2161 pdf_write_to_file(&state);
2162 pdf_free_resources(&state);
2163 return state.has_failed ? -1 : 0;
2164 }