1 /****************************************************************************
2 * RRDtool 1.2rc6 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 }
325 /* find bbox of a string */
326 static void compute_string_bbox(gfx_string string) {
327 unsigned int n;
328 FT_BBox bbox;
330 bbox.xMin = bbox.yMin = 32000;
331 bbox.xMax = bbox.yMax = -32000;
332 for ( n = 0; n < string->num_glyphs; n++ ) {
333 FT_BBox glyph_bbox;
334 FT_Glyph_Get_CBox( string->glyphs[n].image, ft_glyph_bbox_gridfit,
335 &glyph_bbox );
336 if (glyph_bbox.xMin < bbox.xMin) {
337 bbox.xMin = glyph_bbox.xMin;
338 }
339 if (glyph_bbox.yMin < bbox.yMin) {
340 bbox.yMin = glyph_bbox.yMin;
341 }
342 if (glyph_bbox.xMax > bbox.xMax) {
343 bbox.xMax = glyph_bbox.xMax;
344 }
345 if (glyph_bbox.yMax > bbox.yMax) {
346 bbox.yMax = glyph_bbox.yMax;
347 }
348 }
349 if ( bbox.xMin > bbox.xMax ) {
350 bbox.xMin = 0;
351 bbox.yMin = 0;
352 bbox.xMax = 0;
353 bbox.yMax = 0;
354 }
355 string->bbox.xMin = bbox.xMin;
356 string->bbox.xMax = bbox.xMax;
357 string->bbox.yMin = bbox.yMin;
358 string->bbox.yMax = bbox.yMax;
359 }
361 /* create a free type glyph string */
362 gfx_string gfx_string_create(FT_Face face,const char *text,
363 int rotation, double tabwidth)
364 {
366 FT_GlyphSlot slot = face->glyph; /* a small shortcut */
367 FT_Bool use_kerning;
368 FT_UInt previous;
369 FT_Vector ft_pen;
371 gfx_string string;
372 gfx_char glyph; /* current glyph in table */
373 unsigned int n;
374 int error;
375 int gottab = 0;
377 ft_pen.x = 0; /* start at (0,0) !! */
378 ft_pen.y = 0;
380 string = (gfx_string) malloc (sizeof(struct gfx_string_s));
381 string->width = 0;
382 string->height = 0;
383 string->count = strlen (text);
384 string->glyphs = (gfx_char) calloc (string->count,sizeof(struct gfx_char_s));
385 string->num_glyphs = 0;
386 string->transform.xx = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
387 string->transform.xy = (FT_Fixed)(-sin(M_PI*(rotation)/180.0)*0x10000);
388 string->transform.yx = (FT_Fixed)( sin(M_PI*(rotation)/180.0)*0x10000);
389 string->transform.yy = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
391 use_kerning = FT_HAS_KERNING(face);
392 previous = 0;
393 glyph = string->glyphs;
394 for (n=0; n<string->count; n++, glyph++) {
395 FT_Vector vec;
396 /* handle the tabs ...
397 have a witespace glyph inserted, but set its width such that the distance
398 of the new right edge is x times tabwidth from 0,0 where x is an integer. */
399 char letter = text[n];
400 gottab = 0;
401 if (letter == '\\' && n+1 < string->count && text[n+1] == 't'){
402 /* we have a tab here so skip the backslash and
403 set t to ' ' so that we get a white space */
404 gottab = 1;
405 n++;
406 letter = ' ';
407 }
408 if (letter == '\t'){
409 letter = ' ';
410 gottab = 1 ;
411 }
412 /* initialize each struct gfx_char_s */
413 glyph->index = 0;
414 glyph->pos.x = 0;
415 glyph->pos.y = 0;
416 glyph->image = NULL;
418 glyph->index = FT_Get_Char_Index( face, letter );
420 /* compute glyph origin */
421 if ( use_kerning && previous && glyph->index ) {
422 FT_Vector kerning;
423 FT_Get_Kerning (face, previous, glyph->index,
424 ft_kerning_default, &kerning);
425 ft_pen.x += kerning.x;
426 ft_pen.y += kerning.y;
427 }
429 /* load the glyph image (in its native format) */
430 /* for now, we take a monochrome glyph bitmap */
431 error = FT_Load_Glyph (face, glyph->index, FT_LOAD_DEFAULT);
432 if (error) {
433 fprintf (stderr, "couldn't load glyph: %c\n", letter);
434 continue;
435 }
436 error = FT_Get_Glyph (slot, &glyph->image);
437 if (error) {
438 fprintf (stderr, "couldn't get glyph from slot: %c\n", letter);
439 continue;
440 }
441 /* if we are in tabbing mode, we replace the tab with a space and shift the position
442 of the space so that its left edge is where the tab was supposed to land us */
443 if (gottab){
444 /* we are in gridfitting mode so the calculations happen in 1/64 pixles */
445 ft_pen.x = tabwidth*64.0 * (float)(1 + (long)(ft_pen.x / (tabwidth * 64.0))) - slot->advance.x;
446 }
447 /* store current pen position */
448 glyph->pos.x = ft_pen.x;
449 glyph->pos.y = ft_pen.y;
452 ft_pen.x += slot->advance.x;
453 ft_pen.y += slot->advance.y;
455 /* rotate glyph */
456 vec = glyph->pos;
457 FT_Vector_Transform (&vec, &string->transform);
458 error = FT_Glyph_Transform (glyph->image, &string->transform, &vec);
459 if (error) {
460 fprintf (stderr, "couldn't transform glyph\n");
461 continue;
462 }
464 /* convert to a bitmap - destroy native image */
465 error = FT_Glyph_To_Bitmap (&glyph->image, FT_RENDER_MODE_NORMAL, 0, 1);
466 if (error) {
467 fprintf (stderr, "couldn't convert glyph to bitmap\n");
468 continue;
469 }
471 /* increment number of glyphs */
472 previous = glyph->index;
473 string->num_glyphs++;
474 }
475 /* printf ("number of glyphs = %d\n", string->num_glyphs);*/
476 compute_string_bbox( string );
477 /* the last character was a tab */
478 if (gottab) {
479 string->width = ft_pen.x;
480 } else {
481 string->width = string->bbox.xMax - string->bbox.xMin;
482 }
483 string->height = string->bbox.yMax - string->bbox.yMin;
484 return string;
485 }
488 static int gfx_save_png (art_u8 *buffer, FILE *fp,
489 long width, long height, long bytes_per_pixel);
490 /* render grafics into png image */
492 int gfx_render_png (gfx_canvas_t *canvas,
493 art_u32 width, art_u32 height,
494 gfx_color_t background, FILE *fp){
497 FT_Library library;
498 gfx_node_t *node = canvas->firstnode;
499 art_u8 red = background >> 24, green = (background >> 16) & 0xff;
500 art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
501 unsigned long pys_width = width * canvas->zoom;
502 unsigned long pys_height = height * canvas->zoom;
503 const int bytes_per_pixel = 3;
504 unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
505 art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
506 art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height);
507 FT_Init_FreeType( &library );
508 while(node){
509 switch (node->type) {
510 case GFX_LINE:
511 case GFX_AREA: {
512 ArtVpath *vec,*pvec;
513 double dst[6];
514 ArtSVP *svp,*svpt;
515 art_affine_scale(dst,canvas->zoom,canvas->zoom);
516 vec = art_vpath_affine_transform(node->path,dst);
517 if (node->closed_path)
518 gfx_libart_close_path(node, &vec);
519 /* gfx_round_scaled_coordinates(vec); */
520 pvec = art_vpath_perturb(vec);
521 art_free(vec);
522 if(node->type == GFX_LINE){
523 svp = art_svp_vpath_stroke ( pvec, ART_PATH_STROKE_JOIN_ROUND,
524 ART_PATH_STROKE_CAP_ROUND,
525 node->size*canvas->zoom,4,0.25);
526 } else {
527 svp = art_svp_from_vpath ( pvec );
528 svpt = art_svp_uncross( svp );
529 art_free(svp);
530 svp = art_svp_rewind_uncrossed(svpt,ART_WIND_RULE_NONZERO);
531 art_free(svpt);
532 }
533 art_free(pvec);
534 art_rgb_svp_alpha (svp ,0,0, pys_width, pys_height,
535 node->color, buffer, rowstride, NULL);
536 art_free(svp);
537 break;
538 }
539 case GFX_TEXT: {
540 unsigned int n;
541 int error;
542 art_u8 fcolor[3],falpha;
543 FT_Face face;
544 gfx_char glyph;
545 gfx_string string;
546 FT_Vector vec; /* 26.6 */
548 float pen_x = 0.0 , pen_y = 0.0;
549 /* double x,y; */
550 long ix,iy,iz;
552 fcolor[0] = node->color >> 24;
553 fcolor[1] = (node->color >> 16) & 0xff;
554 fcolor[2] = (node->color >> 8) & 0xff;
555 falpha = node->color & 0xff;
556 error = FT_New_Face( library,
557 (char *)node->filename,
558 0,
559 &face );
560 if ( error ) {
561 rrd_set_error("faild to load %s",node->filename);
562 break;
563 }
564 error = FT_Set_Char_Size(face, /* handle to face object */
565 (long)(node->size*64),
566 (long)(node->size*64),
567 (long)(100*canvas->zoom),
568 (long)(100*canvas->zoom));
569 if ( error ) break;
570 pen_x = node->x * canvas->zoom;
571 pen_y = node->y * canvas->zoom;
573 string = gfx_string_create (face, node->text, node->angle, node->tabwidth);
574 switch(node->halign){
575 case GFX_H_RIGHT: vec.x = -string->bbox.xMax;
576 break;
577 case GFX_H_CENTER: vec.x = abs(string->bbox.xMax) >= abs(string->bbox.xMin) ?
578 -string->bbox.xMax/2:-string->bbox.xMin/2;
579 break;
580 case GFX_H_LEFT: vec.x = -string->bbox.xMin;
581 break;
582 case GFX_H_NULL: vec.x = 0;
583 break;
584 }
586 switch(node->valign){
587 case GFX_V_TOP: vec.y = string->bbox.yMax;
588 break;
589 case GFX_V_CENTER: vec.y = abs(string->bbox.yMax) >= abs(string->bbox.yMin) ?
590 string->bbox.yMax/2:string->bbox.yMin/2;
591 break;
592 case GFX_V_BOTTOM: vec.y = 0;
593 break;
594 case GFX_V_NULL: vec.y = 0;
595 break;
596 }
597 pen_x += vec.x/64;
598 pen_y += vec.y/64;
599 glyph = string->glyphs;
600 for(n=0; n<string->num_glyphs; ++n, ++glyph) {
601 int gr;
602 FT_Glyph image;
603 FT_BitmapGlyph bit;
605 /* make copy to transform */
606 if (! glyph->image) {
607 fprintf (stderr, "no image\n");
608 continue;
609 }
610 error = FT_Glyph_Copy (glyph->image, &image);
611 if (error) {
612 fprintf (stderr, "couldn't copy image\n");
613 continue;
614 }
616 /* transform it */
617 vec = glyph->pos;
618 FT_Vector_Transform (&vec, &string->transform);
620 bit = (FT_BitmapGlyph) image;
622 gr = bit->bitmap.num_grays -1;
623 for (iy=0; iy < bit->bitmap.rows; iy++){
624 long buf_y = iy+(pen_y+0.5)-bit->top;
625 if (buf_y < 0 || buf_y >= (long)pys_height) continue;
626 buf_y *= rowstride;
627 for (ix=0;ix < bit->bitmap.width;ix++){
628 long buf_x = ix + (pen_x + 0.5) + (double)bit->left ;
629 art_u8 font_alpha;
631 if (buf_x < 0 || buf_x >= (long)pys_width) continue;
632 buf_x *= bytes_per_pixel ;
633 font_alpha = *(bit->bitmap.buffer + iy * bit->bitmap.width + ix);
634 font_alpha = (art_u8)((double)font_alpha / gr * falpha);
635 for (iz = 0; iz < 3; iz++){
636 art_u8 *orig = buffer + buf_y + buf_x + iz;
637 *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) +
638 (double)fcolor[iz] / gr * (font_alpha));
639 }
640 }
641 }
642 FT_Done_Glyph (image);
643 }
644 gfx_string_destroy(string);
645 }
646 }
647 node = node->next;
648 }
649 gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
650 art_free(buffer);
651 FT_Done_FreeType( library );
652 return 0;
653 }
655 /* free memory used by nodes this will also remove memory required for
656 associated paths and svcs ... but not for text strings */
657 int
658 gfx_destroy (gfx_canvas_t *canvas){
659 gfx_node_t *next,*node = canvas->firstnode;
660 while(node){
661 next = node->next;
662 art_free(node->path);
663 art_free(node->svp);
664 free(node->text);
665 free(node->filename);
666 art_free(node);
667 node = next;
668 }
669 return 0;
670 }
672 static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){
673 png_structp png_ptr = NULL;
674 png_infop info_ptr = NULL;
675 int i;
676 png_bytep *row_pointers;
677 int rowstride = width * bytes_per_pixel;
678 png_text text[2];
680 if (fp == NULL)
681 return (1);
683 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
684 if (png_ptr == NULL)
685 {
686 return (1);
687 }
688 row_pointers = (png_bytepp)png_malloc(png_ptr,
689 height*sizeof(png_bytep));
691 info_ptr = png_create_info_struct(png_ptr);
693 if (info_ptr == NULL)
694 {
695 png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
696 return (1);
697 }
699 if (setjmp(png_jmpbuf(png_ptr)))
700 {
701 /* If we get here, we had a problem writing the file */
702 png_destroy_write_struct(&png_ptr, &info_ptr);
703 return (1);
704 }
706 png_init_io(png_ptr, fp);
707 png_set_IHDR (png_ptr, info_ptr,width, height,
708 8, PNG_COLOR_TYPE_RGB,
709 PNG_INTERLACE_NONE,
710 PNG_COMPRESSION_TYPE_DEFAULT,
711 PNG_FILTER_TYPE_DEFAULT);
713 text[0].key = "Software";
714 text[0].text = "RRDtool, Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch";
715 text[0].compression = PNG_TEXT_COMPRESSION_NONE;
716 png_set_text (png_ptr, info_ptr, text, 1);
718 /* lets make this fast */
719 png_set_compression_level(png_ptr,1);
720 png_set_filter(png_ptr,PNG_FILTER_TYPE_BASE,PNG_NO_FILTERS);
721 /*
722 png_set_filter(png_ptr,PNG_FILTER_TYPE_BASE,PNG_FILTER_SUB);
723 png_set_compression_strategy(png_ptr,Z_HUFFMAN_ONLY);
724 png_set_compression_level(png_ptr,Z_BEST_SPEED); */
726 /* Write header data */
727 png_write_info (png_ptr, info_ptr);
728 for (i = 0; i < height; i++)
729 row_pointers[i] = (png_bytep) (buffer + i*rowstride);
731 png_write_image(png_ptr, row_pointers);
732 png_write_end(png_ptr, info_ptr);
733 png_destroy_write_struct(&png_ptr, &info_ptr);
734 return 1;
735 }
738 /* ------- SVG -------
739 SVG reference:
740 http://www.w3.org/TR/SVG/
741 */
742 static int svg_indent = 0;
743 static int svg_single_line = 0;
744 static const char *svg_default_font = "Helvetica";
745 typedef struct svg_dash
746 {
747 int dash_enable;
748 double dash_adjust, dash_len, dash_offset;
749 double adjusted_on, adjusted_off;
750 } svg_dash;
753 static void svg_print_indent(FILE *fp)
754 {
755 int i;
756 for (i = svg_indent - svg_single_line; i > 0; i--) {
757 putc(' ', fp);
758 putc(' ', fp);
759 }
760 }
762 static void svg_start_tag(FILE *fp, const char *name)
763 {
764 svg_print_indent(fp);
765 putc('<', fp);
766 fputs(name, fp);
767 svg_indent++;
768 }
770 static void svg_close_tag_single_line(FILE *fp)
771 {
772 svg_single_line++;
773 putc('>', fp);
774 }
776 static void svg_close_tag(FILE *fp)
777 {
778 putc('>', fp);
779 if (!svg_single_line)
780 putc('\n', fp);
781 }
783 static void svg_end_tag(FILE *fp, const char *name)
784 {
785 /* name is NULL if closing empty-node tag */
786 svg_indent--;
787 if (svg_single_line)
788 svg_single_line--;
789 else if (name)
790 svg_print_indent(fp);
791 if (name != NULL) {
792 fputs("</", fp);
793 fputs(name, fp);
794 } else {
795 putc('/', fp);
796 }
797 svg_close_tag(fp);
798 }
800 static void svg_close_tag_empty_node(FILE *fp)
801 {
802 svg_end_tag(fp, NULL);
803 }
805 static void svg_write_text(FILE *fp, const char *text)
806 {
807 const unsigned char *p, *start, *last;
808 unsigned int ch;
809 p = (const unsigned char*)text;
810 if (!p)
811 return;
812 /* trim leading spaces */
813 while (*p == ' ')
814 p++;
815 start = p;
816 /* trim trailing spaces */
817 last = p - 1;
818 while ((ch = *p) != 0) {
819 if (ch != ' ')
820 last = p;
821 p++;
822 }
823 /* encode trimmed text */
824 p = start;
825 while (p <= last) {
826 ch = *p++;
827 ch = afm_host2unicode(ch); /* unsafe macro */
828 switch (ch) {
829 case '&': fputs("&", fp); break;
830 case '<': fputs("<", fp); break;
831 case '>': fputs(">", fp); break;
832 case '"': fputs(""", fp); break;
833 default:
834 if (ch >= 127)
835 fprintf(fp, "&#%d;", ch);
836 else
837 putc(ch, fp);
838 }
839 }
840 }
842 static void svg_format_number(char *buf, int bufsize, double d)
843 {
844 /* omit decimals if integer to reduce filesize */
845 char *p;
846 snprintf(buf, bufsize, "%.2f", d);
847 p = buf; /* doesn't trust snprintf return value */
848 while (*p)
849 p++;
850 while (--p > buf) {
851 char ch = *p;
852 if (ch == '0') {
853 *p = '\0'; /* zap trailing zeros */
854 continue;
855 }
856 if (ch == '.')
857 *p = '\0'; /* zap trailing dot */
858 break;
859 }
860 }
862 static void svg_write_number(FILE *fp, double d)
863 {
864 char buf[60];
865 svg_format_number(buf, sizeof(buf), d);
866 fputs(buf, fp);
867 }
869 static int svg_color_is_black(int c)
870 {
871 /* gfx_color_t is RRGGBBAA */
872 return c == 0x000000FF;
873 }
875 static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
876 {
877 /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
878 gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
879 gfx_color_t opacity = c & 0xFF;
880 fprintf(fp, " %s=\"", attr);
881 if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
882 /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
883 fprintf(fp, "#%03lX",
884 ( ((rrggbb >> 8) & 0xF00)
885 | ((rrggbb >> 4) & 0x0F0)
886 | ( rrggbb & 0x00F)));
887 } else {
888 fprintf(fp, "#%06lX", rrggbb);
889 }
890 fputs("\"", fp);
891 if (opacity != 0xFF) {
892 fprintf(fp, " stroke-opacity=\"");
893 svg_write_number(fp, opacity / 255.0);
894 fputs("\"", fp);
895 }
896 }
898 static void svg_get_dash(gfx_node_t *node, svg_dash *d)
899 {
900 double offset;
901 int mult;
902 if (node->dash_on <= 0 || node->dash_off <= 0) {
903 d->dash_enable = 0;
904 return;
905 }
906 d->dash_enable = 1;
907 d->dash_len = node->dash_on + node->dash_off;
908 /* dash on/off adjustment due to round caps */
909 d->dash_adjust = 0.8 * node->size;
910 d->adjusted_on = node->dash_on - d->dash_adjust;
911 if (d->adjusted_on < 0.01)
912 d->adjusted_on = 0.01;
913 d->adjusted_off = d->dash_len - d->adjusted_on;
914 /* dash offset calc */
915 if (node->path[0].x == node->path[1].x) /* only good for horz/vert lines */
916 offset = node->path[0].y;
917 else
918 offset = node->path[0].x;
919 mult = (int)fabs(offset / d->dash_len);
920 d->dash_offset = offset - mult * d->dash_len;
921 if (node->path[0].x < node->path[1].x || node->path[0].y < node->path[1].y)
922 d->dash_offset = d->dash_len - d->dash_offset;
923 }
925 static int svg_dash_equal(svg_dash *a, svg_dash *b)
926 {
927 if (a->dash_enable != b->dash_enable)
928 return 0;
929 if (a->adjusted_on != b->adjusted_on)
930 return 0;
931 if (a->adjusted_off != b->adjusted_off)
932 return 0;
933 /* rest of properties will be the same when on+off are */
934 return 1;
935 }
937 static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
938 {
939 svg_dash dash_info;
940 svg_get_dash(node, &dash_info);
941 fputs(" stroke-width=\"", fp);
942 svg_write_number(fp, node->size);
943 fputs("\"", fp);
944 svg_write_color(fp, node->color, "stroke");
945 fputs(" fill=\"none\"", fp);
946 if (dash_info.dash_enable) {
947 if (dash_info.dash_offset != 0) {
948 fputs(" stroke-dashoffset=\"", fp);
949 svg_write_number(fp, dash_info.dash_offset);
950 fputs("\"", fp);
951 }
952 fputs(" stroke-dasharray=\"", fp);
953 svg_write_number(fp, dash_info.adjusted_on);
954 fputs(",", fp);
955 svg_write_number(fp, dash_info.adjusted_off);
956 fputs("\"", fp);
957 }
958 }
960 static int svg_is_int_step(double a, double b)
961 {
962 double diff = fabs(a - b);
963 return floor(diff) == diff;
964 }
966 static int svg_path_straight_segment(FILE *fp,
967 double lastA, double currentA, double currentB,
968 gfx_node_t *node,
969 int segment_idx, int isx, char absChar, char relChar)
970 {
971 if (!svg_is_int_step(lastA, currentA)) {
972 putc(absChar, fp);
973 svg_write_number(fp, currentA);
974 return 0;
975 }
976 if (segment_idx < node->points - 1) {
977 ArtVpath *vec = node->path + segment_idx + 1;
978 if (vec->code == ART_LINETO) {
979 double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
980 double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
981 if (nextB == currentB
982 && ((currentA >= lastA) == (nextA >= currentA))
983 && svg_is_int_step(currentA, nextA)) {
984 return 1; /* skip to next as it is a straight line */
985 }
986 }
987 }
988 putc(relChar, fp);
989 svg_write_number(fp, currentA - lastA);
990 return 0;
991 }
993 static void svg_path(FILE *fp, gfx_node_t *node, int multi)
994 {
995 int i;
996 double lastX = 0, lastY = 0;
997 /* for straight lines <path..> tags take less space than
998 <line..> tags because of the efficient packing
999 in the 'd' attribute */
1000 svg_start_tag(fp, "path");
1001 if (!multi)
1002 svg_common_path_attributes(fp, node);
1003 fputs(" d=\"", fp);
1004 /* specification of the 'd' attribute: */
1005 /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
1006 for (i = 0; i < node->points; i++) {
1007 ArtVpath *vec = node->path + i;
1008 double x = vec->x - LINEOFFSET;
1009 double y = vec->y - LINEOFFSET;
1010 switch (vec->code) {
1011 case ART_MOVETO_OPEN: /* fall-through */
1012 case ART_MOVETO:
1013 putc('M', fp);
1014 svg_write_number(fp, x);
1015 putc(',', fp);
1016 svg_write_number(fp, y);
1017 break;
1018 case ART_LINETO:
1019 /* try optimize filesize by using minimal lineto commands */
1020 /* without introducing rounding errors. */
1021 if (x == lastX) {
1022 if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
1023 continue;
1024 } else if (y == lastY) {
1025 if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
1026 continue;
1027 } else {
1028 putc('L', fp);
1029 svg_write_number(fp, x);
1030 putc(',', fp);
1031 svg_write_number(fp, y);
1032 }
1033 break;
1034 case ART_CURVETO: break; /* unsupported */
1035 case ART_END: break; /* nop */
1036 }
1037 lastX = x;
1038 lastY = y;
1039 }
1040 if (node->closed_path)
1041 fputs(" Z", fp);
1042 fputs("\"", fp);
1043 svg_close_tag_empty_node(fp);
1044 }
1046 static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
1047 {
1048 /* optimize for multiple paths with the same color, penwidth, etc. */
1049 int num = 1;
1050 gfx_node_t *node = *nodeR;
1051 gfx_node_t *next = node->next;
1052 while (next) {
1053 if (next->type != node->type
1054 || next->size != node->size
1055 || next->color != node->color
1056 || next->dash_on != node->dash_on
1057 || next->dash_off != node->dash_off)
1058 break;
1059 next = next->next;
1060 num++;
1061 }
1062 if (num == 1) {
1063 svg_path(fp, node, 0);
1064 return;
1065 }
1066 svg_start_tag(fp, "g");
1067 svg_common_path_attributes(fp, node);
1068 svg_close_tag(fp);
1069 while (num && node) {
1070 svg_path(fp, node, 1);
1071 if (!--num)
1072 break;
1073 node = node->next;
1074 *nodeR = node;
1075 }
1076 svg_end_tag(fp, "g");
1077 }
1079 static void svg_area(FILE *fp, gfx_node_t *node)
1080 {
1081 int i;
1082 double startX = 0, startY = 0;
1083 svg_start_tag(fp, "polygon");
1084 fputs(" ", fp);
1085 svg_write_color(fp, node->color, "fill");
1086 fputs(" points=\"", fp);
1087 for (i = 0; i < node->points; i++) {
1088 ArtVpath *vec = node->path + i;
1089 double x = vec->x - LINEOFFSET;
1090 double y = vec->y - LINEOFFSET;
1091 switch (vec->code) {
1092 case ART_MOVETO_OPEN: /* fall-through */
1093 case ART_MOVETO:
1094 svg_write_number(fp, x);
1095 putc(',', fp);
1096 svg_write_number(fp, y);
1097 startX = x;
1098 startY = y;
1099 break;
1100 case ART_LINETO:
1101 if (i == node->points - 2
1102 && node->path[i + 1].code == ART_END
1103 && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
1104 break; /* poly area always closed, no need for last point */
1105 }
1106 putc(' ', fp);
1107 svg_write_number(fp, x);
1108 putc(',', fp);
1109 svg_write_number(fp, y);
1110 break;
1111 case ART_CURVETO: break; /* unsupported */
1112 case ART_END: break; /* nop */
1113 }
1114 }
1115 fputs("\"", fp);
1116 svg_close_tag_empty_node(fp);
1117 }
1119 static void svg_text(FILE *fp, gfx_node_t *node)
1120 {
1121 double x = node->x - LINEOFFSET;
1122 double y = node->y - LINEOFFSET;
1123 if (node->angle != 0) {
1124 svg_start_tag(fp, "g");
1125 fputs(" transform=\"translate(", fp);
1126 svg_write_number(fp, x);
1127 fputs(",", fp);
1128 svg_write_number(fp, y);
1129 fputs(") rotate(", fp);
1130 svg_write_number(fp, node->angle);
1131 fputs(")\"", fp);
1132 x = y = 0;
1133 svg_close_tag(fp);
1134 }
1135 switch (node->valign) {
1136 case GFX_V_TOP: y += node->size; break;
1137 case GFX_V_CENTER: y += node->size / 3; break;
1138 case GFX_V_BOTTOM: break;
1139 case GFX_V_NULL: break;
1140 }
1141 svg_start_tag(fp, "text");
1142 fputs(" x=\"", fp);
1143 svg_write_number(fp, x);
1144 fputs("\" y=\"", fp);
1145 svg_write_number(fp, y);
1147 /* if (strcmp(node->filename, svg_default_font))
1148 fprintf(fp, " font-family=\"%s\"", node->filename);
1149 */
1150 fputs("\" font-family=\"Helvetica", fp);
1151 fputs("\" font-size=\"", fp);
1152 svg_write_number(fp, node->size);
1153 fputs("\"", fp);
1154 if (!svg_color_is_black(node->color))
1155 svg_write_color(fp, node->color, "fill");
1156 switch (node->halign) {
1157 case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
1158 case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
1159 case GFX_H_LEFT: break;
1160 case GFX_H_NULL: break;
1161 }
1162 svg_close_tag_single_line(fp);
1163 /* support for node->tabwidth missing */
1164 svg_write_text(fp, node->text);
1165 svg_end_tag(fp, "text");
1166 if (node->angle != 0)
1167 svg_end_tag(fp, "g");
1168 }
1170 int gfx_render_svg (gfx_canvas_t *canvas,
1171 art_u32 width, art_u32 height,
1172 gfx_color_t background, FILE *fp){
1173 gfx_node_t *node = canvas->firstnode;
1174 fputs(
1175 "<?xml version=\"1.0\" standalone=\"no\"?>\n"
1176 "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
1177 " \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
1178 "<!--\n"
1179 " SVG file created by RRDtool,\n"
1180 " Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
1181 "\n"
1182 " The width/height attributes in the outhermost svg node\n"
1183 " are just default sizes for the browser which is used\n"
1184 " if the svg file is openened directly without being\n"
1185 " embedded in an html file.\n"
1186 " The viewBox is the local coord system for rrdtool.\n"
1187 "-->\n", fp);
1188 svg_start_tag(fp, "svg");
1189 fputs(" width=\"", fp);
1190 svg_write_number(fp, width * canvas->zoom);
1191 fputs("\" height=\"", fp);
1192 svg_write_number(fp, height * canvas->zoom);
1193 fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
1194 svg_write_number(fp, -LINEOFFSET);
1195 fputs(" ", fp);
1196 svg_write_number(fp, -LINEOFFSET);
1197 fputs(" ", fp);
1198 svg_write_number(fp, width - LINEOFFSET);
1199 fputs(" ", fp);
1200 svg_write_number(fp, height - LINEOFFSET);
1201 fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
1202 fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
1203 fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
1204 svg_close_tag(fp);
1205 svg_start_tag(fp, "rect");
1206 fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
1207 svg_write_color(fp, background, "fill");
1208 svg_close_tag_empty_node(fp);
1209 while (node) {
1210 switch (node->type) {
1211 case GFX_LINE:
1212 svg_multi_path(fp, &node);
1213 break;
1214 case GFX_AREA:
1215 svg_area(fp, node);
1216 break;
1217 case GFX_TEXT:
1218 svg_text(fp, node);
1219 }
1220 node = node->next;
1221 }
1222 svg_end_tag(fp, "svg");
1223 return 0;
1224 }
1226 /* ------- EPS -------
1227 EPS and Postscript references:
1228 http://partners.adobe.com/asn/developer/technotes/postscript.html
1229 */
1231 typedef struct eps_font
1232 {
1233 const char *ps_font;
1234 int id;
1235 struct eps_font *next;
1236 } eps_font;
1238 typedef struct eps_state
1239 {
1240 FILE *fp;
1241 gfx_canvas_t *canvas;
1242 art_u32 page_width, page_height;
1243 eps_font *font_list;
1244 /*--*/
1245 gfx_color_t color;
1246 const char *font;
1247 double font_size;
1248 double line_width;
1249 int linecap, linejoin;
1250 int has_dash;
1251 } eps_state;
1253 static void eps_set_color(eps_state *state, gfx_color_t color)
1254 {
1255 /* gfx_color_t is RRGGBBAA */
1256 if (state->color == color)
1257 return;
1258 fprintf(state->fp, "%d %d %d Rgb\n",
1259 (int)((color >> 24) & 255),
1260 (int)((color >> 16) & 255),
1261 (int)((color >> 8) & 255));
1262 state->color = color;
1263 }
1265 static int eps_add_font(eps_state *state, gfx_node_t *node)
1266 {
1267 /* The fonts list could be postponed to the end using
1268 (atend), but let's be nice and have them in the header. */
1269 const char *ps_font = afm_get_font_postscript_name(node->filename);
1270 eps_font *ef;
1271 for (ef = state->font_list; ef; ef = ef->next) {
1272 if (!strcmp(ps_font, ef->ps_font))
1273 return 0;
1274 }
1275 ef = malloc(sizeof(eps_font));
1276 if (ef == NULL) {
1277 rrd_set_error("malloc for eps_font");
1278 return -1;
1279 }
1280 ef->next = state->font_list;
1281 ef->ps_font = ps_font;
1282 state->font_list = ef;
1283 return 0;
1284 }
1286 static void eps_list_fonts(eps_state *state, const char *dscName)
1287 {
1288 eps_font *ef;
1289 int lineLen = strlen(dscName);
1290 if (!state->font_list)
1291 return;
1292 fputs(dscName, state->fp);
1293 for (ef = state->font_list; ef; ef = ef->next) {
1294 int nameLen = strlen(ef->ps_font);
1295 if (lineLen + nameLen > 100 && lineLen) {
1296 fputs("\n", state->fp);
1297 fputs("%%- \n", state->fp);
1298 lineLen = 5;
1299 } else {
1300 fputs(" ", state->fp);
1301 lineLen++;
1302 }
1303 fputs(ef->ps_font, state->fp);
1304 lineLen += nameLen;
1305 }
1306 fputs("\n", state->fp);
1307 }
1309 static void eps_define_fonts(eps_state *state)
1310 {
1311 eps_font *ef;
1312 if (!state->font_list)
1313 return;
1314 for (ef = state->font_list; ef; ef = ef->next) {
1315 /* PostScript¨ LANGUAGE REFERENCE third edition
1316 page 349 */
1317 fprintf(state->fp,
1318 "%%\n"
1319 "/%s findfont dup length dict begin\n"
1320 "{ 1 index /FID ne {def} {pop pop} ifelse } forall\n"
1321 "/Encoding ISOLatin1Encoding def\n"
1322 "currentdict end\n"
1323 "/%s-ISOLatin1 exch definefont pop\n"
1324 "/SetFont-%s { /%s-ISOLatin1 findfont exch scalefont setfont } bd\n",
1325 ef->ps_font, ef->ps_font, ef->ps_font, ef->ps_font);
1326 }
1327 }
1329 static int eps_prologue(eps_state *state)
1330 {
1331 gfx_node_t *node;
1332 fputs(
1333 "%!PS-Adobe-3.0 EPSF-3.0\n"
1334 "%%Creator: RRDtool 1.2rc6 Tobias Oetiker, http://tobi.oetiker.ch\n"
1335 /* can't like weird chars here */
1336 "%%Title: (RRDtool output)\n"
1337 "%%DocumentData: Clean7Bit\n"
1338 "", state->fp);
1339 fprintf(state->fp, "%%%%BoundingBox: 0 0 %d %d\n",
1340 state->page_width, state->page_height);
1341 for (node = state->canvas->firstnode; node; node = node->next) {
1342 if (node->type == GFX_TEXT && eps_add_font(state, node) == -1)
1343 return -1;
1344 }
1345 eps_list_fonts(state, "%%DocumentFonts:");
1346 eps_list_fonts(state, "%%DocumentNeededFonts:");
1347 fputs(
1348 "%%EndComments\n"
1349 "%%BeginProlog\n"
1350 "%%EndProlog\n" /* must have, or BoundingBox is ignored */
1351 "/bd { bind def } bind def\n"
1352 "", state->fp);
1353 fprintf(state->fp, "/X { %.2f add } bd\n", LINEOFFSET);
1354 fputs(
1355 "/X2 {X exch X exch} bd\n"
1356 "/M {X2 moveto} bd\n"
1357 "/L {X2 lineto} bd\n"
1358 "/m {moveto} bd\n"
1359 "/l {lineto} bd\n"
1360 "/S {stroke} bd\n"
1361 "/CP {closepath} bd\n"
1362 "/WS {setlinewidth stroke} bd\n"
1363 "/F {fill} bd\n"
1364 "/TaL { } bd\n"
1365 "/TaC {dup stringwidth pop neg 2 div 0 rmoveto } bd\n"
1366 "/TaR {dup stringwidth pop neg 0 rmoveto } bd\n"
1367 "/TL {moveto TaL show} bd\n"
1368 "/TC {moveto TaC show} bd\n"
1369 "/TR {moveto TaR show} bd\n"
1370 "/Rgb { 255.0 div 3 1 roll\n"
1371 " 255.0 div 3 1 roll \n"
1372 " 255.0 div 3 1 roll setrgbcolor } bd\n"
1373 "", state->fp);
1374 eps_define_fonts(state);
1375 return 0;
1376 }
1378 static void eps_clear_dash(eps_state *state)
1379 {
1380 if (!state->has_dash)
1381 return;
1382 state->has_dash = 0;
1383 fputs("[1 0] 0 setdash\n", state->fp);
1384 }
1386 static void eps_write_linearea(eps_state *state, gfx_node_t *node)
1387 {
1388 int i;
1389 FILE *fp = state->fp;
1390 int useOffset = 0;
1391 int clearDashIfAny = 1;
1392 eps_set_color(state, node->color);
1393 if (node->type == GFX_LINE) {
1394 svg_dash dash_info;
1395 if (state->linecap != 1) {
1396 fputs("1 setlinecap\n", fp);
1397 state->linecap = 1;
1398 }
1399 if (state->linejoin != 1) {
1400 fputs("1 setlinejoin\n", fp);
1401 state->linejoin = 1;
1402 }
1403 svg_get_dash(node, &dash_info);
1404 if (dash_info.dash_enable) {
1405 clearDashIfAny = 0;
1406 state->has_dash = 1;
1407 fputs("[", fp);
1408 svg_write_number(fp, dash_info.adjusted_on);
1409 fputs(" ", fp);
1410 svg_write_number(fp, dash_info.adjusted_off);
1411 fputs("] ", fp);
1412 svg_write_number(fp, dash_info.dash_offset);
1413 fputs(" setdash\n", fp);
1414 }
1415 }
1416 if (clearDashIfAny)
1417 eps_clear_dash(state);
1418 for (i = 0; i < node->points; i++) {
1419 ArtVpath *vec = node->path + i;
1420 double x = vec->x;
1421 double y = state->page_height - vec->y;
1422 if (vec->code == ART_MOVETO_OPEN || vec->code == ART_MOVETO)
1423 useOffset = (fabs(x - floor(x) - 0.5) < 0.01 && fabs(y - floor(y) - 0.5) < 0.01);
1424 if (useOffset) {
1425 x -= LINEOFFSET;
1426 y -= LINEOFFSET;
1427 }
1428 switch (vec->code) {
1429 case ART_MOVETO_OPEN: /* fall-through */
1430 case ART_MOVETO:
1431 svg_write_number(fp, x);
1432 fputc(' ', fp);
1433 svg_write_number(fp, y);
1434 fputc(' ', fp);
1435 fputs(useOffset ? "M\n" : "m\n", fp);
1436 break;
1437 case ART_LINETO:
1438 svg_write_number(fp, x);
1439 fputc(' ', fp);
1440 svg_write_number(fp, y);
1441 fputc(' ', fp);
1442 fputs(useOffset ? "L\n" : "l\n", fp);
1443 break;
1444 case ART_CURVETO: break; /* unsupported */
1445 case ART_END: break; /* nop */
1446 }
1447 }
1448 if (node->type == GFX_LINE) {
1449 if (node->closed_path)
1450 fputs("CP ", fp);
1451 if (node->size != state->line_width) {
1452 state->line_width = node->size;
1453 svg_write_number(fp, state->line_width);
1454 fputs(" WS\n", fp);
1455 } else {
1456 fputs("S\n", fp);
1457 }
1458 } else {
1459 fputs("F\n", fp);
1460 }
1461 }
1463 static void eps_write_text(eps_state *state, gfx_node_t *node)
1464 {
1465 FILE *fp = state->fp;
1466 const unsigned char *p;
1467 const char *ps_font = afm_get_font_postscript_name(node->filename);
1468 char align = 'L';
1469 double x = node->x;
1470 double y = state->page_height - node->y, ydelta = 0;
1471 int lineLen = 0;
1472 eps_set_color(state, node->color);
1473 if (strcmp(ps_font, state->font) || node->size != state->font_size) {
1474 state->font = ps_font;
1475 state->font_size = node->size;
1476 svg_write_number(fp, state->font_size);
1477 fprintf(fp, " SetFont-%s\n", state->font);
1478 }
1479 fputs("(", fp);
1480 lineLen = 20;
1481 for (p = (const unsigned char*)node->text; *p; p++) {
1482 if (lineLen > 70) {
1483 fputs("\\\n", fp); /* backslash and \n */
1484 lineLen = 0;
1485 }
1486 switch (*p) {
1487 case '(':
1488 case ')':
1489 case '\\':
1490 case '\n':
1491 case '\r':
1492 case '\t':
1493 fputc('\\', fp);
1494 lineLen++;
1495 /* fall-through */
1496 default:
1497 if (*p >= 126)
1498 fprintf(fp, "\\%03o", *p);
1499 else
1500 fputc(*p, fp);
1501 lineLen++;
1502 }
1503 }
1504 fputs(") ", fp);
1505 switch(node->valign){
1506 case GFX_V_TOP: ydelta = -node->size; break;
1507 case GFX_V_CENTER: ydelta = -node->size / 3.0; break;
1508 case GFX_V_BOTTOM: break;
1509 case GFX_V_NULL: break;
1510 }
1511 if (node->angle == 0)
1512 y += ydelta;
1513 switch (node->halign) {
1514 case GFX_H_RIGHT: align = 'R'; break;
1515 case GFX_H_CENTER: align = 'C'; break;
1516 case GFX_H_LEFT: align= 'L'; break;
1517 case GFX_H_NULL: align= 'L'; break;
1518 }
1519 if (node->angle != 0) {
1520 fputs("\n", fp);
1521 fputs(" gsave ", fp);
1522 svg_write_number(fp, x);
1523 fputc(' ', fp);
1524 svg_write_number(fp, y);
1525 fputs(" translate ", fp);
1526 svg_write_number(fp, -node->angle);
1527 fputs(" rotate 0 ", fp);
1528 svg_write_number(fp, ydelta);
1529 fputs(" moveto ", fp);
1530 fprintf(fp, "Ta%c", align);
1531 fputs(" show grestore\n", fp);
1532 } else {
1533 svg_write_number(fp, x);
1534 fputc(' ', fp);
1535 svg_write_number(fp, y);
1536 fputs(" T", fp);
1537 fputc(align, fp);
1538 fputc('\n', fp);
1539 }
1540 }
1542 static int eps_write_content(eps_state *state)
1543 {
1544 gfx_node_t *node;
1545 fputs("%\n", state->fp);
1546 for (node = state->canvas->firstnode; node; node = node->next) {
1547 switch (node->type) {
1548 case GFX_LINE:
1549 case GFX_AREA:
1550 eps_write_linearea(state, node);
1551 break;
1552 case GFX_TEXT:
1553 eps_write_text(state, node);
1554 break;
1555 }
1556 }
1557 return 0;
1558 }
1560 int gfx_render_eps (gfx_canvas_t *canvas,
1561 art_u32 width, art_u32 height,
1562 gfx_color_t background, FILE *fp){
1563 struct eps_state state;
1564 state.fp = fp;
1565 state.canvas = canvas;
1566 state.page_width = width;
1567 state.page_height = height;
1568 state.font = "no-default-font";
1569 state.font_size = -1;
1570 state.color = 0; /* black */
1571 state.font_list = NULL;
1572 state.linecap = -1;
1573 state.linejoin = -1;
1574 state.has_dash = 0;
1575 if (eps_prologue(&state) == -1)
1576 return -1;
1577 eps_set_color(&state, background);
1578 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1579 height, width, height, width);
1580 if (eps_write_content(&state) == -1)
1581 return 0;
1582 fputs("showpage\n", fp);
1583 fputs("%%EOF\n", fp);
1584 while (state.font_list) {
1585 eps_font *next = state.font_list->next;
1586 free(state.font_list);
1587 state.font_list = next;
1588 }
1589 return 0;
1590 }
1592 /* ------- PDF -------
1593 PDF references page:
1594 http://partners.adobe.com/asn/developer/technotes/acrobatpdf.html
1595 */
1597 typedef struct pdf_buffer
1598 {
1599 int id, is_obj, is_dict, is_stream, pdf_file_pos;
1600 char *data;
1601 int alloc_size, current_size;
1602 struct pdf_buffer *previous_buffer, *next_buffer;
1603 struct pdf_state *state;
1604 } pdf_buffer;
1606 typedef struct pdf_font
1607 {
1608 const char *ps_font;
1609 pdf_buffer obj;
1610 struct pdf_font *next;
1611 } pdf_font;
1613 typedef struct pdf_state
1614 {
1615 FILE *fp;
1616 gfx_canvas_t *canvas;
1617 art_u32 page_width, page_height;
1618 pdf_font *font_list;
1619 pdf_buffer *first_buffer, *last_buffer;
1620 int pdf_file_pos;
1621 int has_failed;
1622 /*--*/
1623 gfx_color_t stroke_color, fill_color;
1624 int font_id;
1625 double font_size;
1626 double line_width;
1627 svg_dash dash;
1628 int linecap, linejoin;
1629 int last_obj_id;
1630 /*--*/
1631 pdf_buffer pdf_header;
1632 pdf_buffer catalog_obj, pages_obj, page1_obj;
1633 pdf_buffer fontsdict_obj;
1634 pdf_buffer graph_stream;
1635 } pdf_state;
1637 static void pdf_init_buffer(pdf_state *state, pdf_buffer *buf)
1638 {
1639 int initial_size = 32;
1640 buf->state = state;
1641 buf->id = -42;
1642 buf->alloc_size = 0;
1643 buf->current_size = 0;
1644 buf->data = (char*)malloc(initial_size);
1645 buf->is_obj = 0;
1646 buf->previous_buffer = NULL;
1647 buf->next_buffer = NULL;
1648 if (buf->data == NULL) {
1649 rrd_set_error("malloc for pdf_buffer data");
1650 state->has_failed = 1;
1651 return;
1652 }
1653 buf->alloc_size = initial_size;
1654 if (state->last_buffer)
1655 state->last_buffer->next_buffer = buf;
1656 if (state->first_buffer == NULL)
1657 state->first_buffer = buf;
1658 buf->previous_buffer = state->last_buffer;
1659 state->last_buffer = buf;
1660 }
1662 static void pdf_put(pdf_buffer *buf, const char *text, int len)
1663 {
1664 if (len <= 0)
1665 return;
1666 if (buf->alloc_size < buf->current_size + len) {
1667 int new_size = buf->alloc_size;
1668 char *new_buf;
1669 while (new_size < buf->current_size + len)
1670 new_size *= 4;
1671 new_buf = (char*)malloc(new_size);
1672 if (new_buf == NULL) {
1673 rrd_set_error("re-malloc for pdf_buffer data");
1674 buf->state->has_failed = 1;
1675 return;
1676 }
1677 memcpy(new_buf, buf->data, buf->current_size);
1678 free(buf->data);
1679 buf->data = new_buf;
1680 buf->alloc_size = new_size;
1681 }
1682 memcpy(buf->data + buf->current_size, text, len);
1683 buf->current_size += len;
1684 }
1686 static void pdf_puts(pdf_buffer *buf, const char *text)
1687 {
1688 pdf_put(buf, text, strlen(text));
1689 }
1691 static void pdf_indent(pdf_buffer *buf)
1692 {
1693 pdf_puts(buf, "\t");
1694 }
1696 static void pdf_putsi(pdf_buffer *buf, const char *text)
1697 {
1698 pdf_indent(buf);
1699 pdf_puts(buf, text);
1700 }
1702 static void pdf_putint(pdf_buffer *buf, int i)
1703 {
1704 char tmp[20];
1705 sprintf(tmp, "%d", i);
1706 pdf_puts(buf, tmp);
1707 }
1709 static void pdf_putnumber(pdf_buffer *buf, double d)
1710 {
1711 char tmp[50];
1712 svg_format_number(tmp, sizeof(tmp), d);
1713 pdf_puts(buf, tmp);
1714 }
1716 static void pdf_init_object(pdf_state *state, pdf_buffer *buf)
1717 {
1718 pdf_init_buffer(state, buf);
1719 buf->id = ++state->last_obj_id;
1720 buf->is_obj = 1;
1721 buf->is_stream = 0;
1722 }
1724 static void pdf_init_dict(pdf_state *state, pdf_buffer *buf)
1725 {
1726 pdf_init_object(state, buf);
1727 buf->is_dict = 1;
1728 }
1730 static void pdf_set_color(pdf_buffer *buf, gfx_color_t color,
1731 gfx_color_t *current_color, const char *op)
1732 {
1733 /* gfx_color_t is RRGGBBAA */
1734 if (*current_color == color)
1735 return;
1736 pdf_putnumber(buf, ((color >> 24) & 255) / 255.0);
1737 pdf_puts(buf, " ");
1738 pdf_putnumber(buf, ((color >> 16) & 255) / 255.0);
1739 pdf_puts(buf, " ");
1740 pdf_putnumber(buf, ((color >> 8) & 255) / 255.0);
1741 pdf_puts(buf, " ");
1742 pdf_puts(buf, op);
1743 pdf_puts(buf, "\n");
1744 *current_color = color;
1745 }
1747 static void pdf_set_stroke_color(pdf_buffer *buf, gfx_color_t color)
1748 {
1749 pdf_set_color(buf, color, &buf->state->stroke_color, "RG");
1750 }
1752 static void pdf_set_fill_color(pdf_buffer *buf, gfx_color_t color)
1753 {
1754 pdf_set_color(buf, color, &buf->state->fill_color, "rg");
1755 }
1757 static pdf_font *pdf_find_font(pdf_state *state, gfx_node_t *node)
1758 {
1759 const char *ps_font = afm_get_font_postscript_name(node->filename);
1760 pdf_font *ef;
1761 for (ef = state->font_list; ef; ef = ef->next) {
1762 if (!strcmp(ps_font, ef->ps_font))
1763 return ef;
1764 }
1765 return NULL;
1766 }
1768 static void pdf_add_font(pdf_state *state, gfx_node_t *node)
1769 {
1770 pdf_font *ef = pdf_find_font(state, node);
1771 if (ef)
1772 return;
1773 ef = malloc(sizeof(pdf_font));
1774 if (ef == NULL) {
1775 rrd_set_error("malloc for pdf_font");
1776 state->has_failed = 1;
1777 return;
1778 }
1779 pdf_init_dict(state, &ef->obj);
1780 ef->next = state->font_list;
1781 ef->ps_font = afm_get_font_postscript_name(node->filename);
1782 state->font_list = ef;
1783 /* fonts dict */
1784 pdf_putsi(&state->fontsdict_obj, "/F");
1785 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1786 pdf_puts(&state->fontsdict_obj, " ");
1787 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1788 pdf_puts(&state->fontsdict_obj, " 0 R\n");
1789 /* fonts def */
1790 pdf_putsi(&ef->obj, "/Type /Font\n");
1791 pdf_putsi(&ef->obj, "/Subtype /Type1\n");
1792 pdf_putsi(&ef->obj, "/Name /F");
1793 pdf_putint(&ef->obj, ef->obj.id);
1794 pdf_puts(&ef->obj, "\n");
1795 pdf_putsi(&ef->obj, "/BaseFont /");
1796 pdf_puts(&ef->obj, ef->ps_font);
1797 pdf_puts(&ef->obj, "\n");
1798 pdf_putsi(&ef->obj, "/Encoding /WinAnsiEncoding\n");
1799 /* 'Cp1252' (this is latin 1 extended with 27 characters;
1800 the encoding is also known as 'winansi')
1801 http://www.lowagie.com/iText/tutorial/ch09.html */
1802 }
1804 static void pdf_create_fonts(pdf_state *state)
1805 {
1806 gfx_node_t *node;
1807 for (node = state->canvas->firstnode; node; node = node->next) {
1808 if (node->type == GFX_TEXT)
1809 pdf_add_font(state, node);
1810 }
1811 }
1813 static void pdf_write_linearea(pdf_state *state, gfx_node_t *node)
1814 {
1815 int i;
1816 pdf_buffer *s = &state->graph_stream;
1817 if (node->type == GFX_LINE) {
1818 svg_dash dash_info;
1819 svg_get_dash(node, &dash_info);
1820 if (!svg_dash_equal(&dash_info, &state->dash)) {
1821 state->dash = dash_info;
1822 if (dash_info.dash_enable) {
1823 pdf_puts(s, "[");
1824 pdf_putnumber(s, dash_info.adjusted_on);
1825 pdf_puts(s, " ");
1826 pdf_putnumber(s, dash_info.adjusted_off);
1827 pdf_puts(s, "] ");
1828 pdf_putnumber(s, dash_info.dash_offset);
1829 pdf_puts(s, " d\n");
1830 } else {
1831 pdf_puts(s, "[] 0 d\n");
1832 }
1833 }
1834 pdf_set_stroke_color(s, node->color);
1835 if (state->linecap != 1) {
1836 pdf_puts(s, "1 j\n");
1837 state->linecap = 1;
1838 }
1839 if (state->linejoin != 1) {
1840 pdf_puts(s, "1 J\n");
1841 state->linejoin = 1;
1842 }
1843 if (node->size != state->line_width) {
1844 state->line_width = node->size;
1845 pdf_putnumber(s, state->line_width);
1846 pdf_puts(s, " w\n");
1847 }
1848 } else {
1849 pdf_set_fill_color(s, node->color);
1850 }
1851 for (i = 0; i < node->points; i++) {
1852 ArtVpath *vec = node->path + i;
1853 double x = vec->x;
1854 double y = state->page_height - vec->y;
1855 if (node->type == GFX_AREA) {
1856 x += LINEOFFSET; /* adjust for libart handling of areas */
1857 y -= LINEOFFSET;
1858 }
1859 switch (vec->code) {
1860 case ART_MOVETO_OPEN: /* fall-through */
1861 case ART_MOVETO:
1862 pdf_putnumber(s, x);
1863 pdf_puts(s, " ");
1864 pdf_putnumber(s, y);
1865 pdf_puts(s, " m\n");
1866 break;
1867 case ART_LINETO:
1868 pdf_putnumber(s, x);
1869 pdf_puts(s, " ");
1870 pdf_putnumber(s, y);
1871 pdf_puts(s, " l\n");
1872 break;
1873 case ART_CURVETO: break; /* unsupported */
1874 case ART_END: break; /* nop */
1875 }
1876 }
1877 if (node->type == GFX_LINE) {
1878 pdf_puts(s, node->closed_path ? "s\n" : "S\n");
1879 } else {
1880 pdf_puts(s, "f\n");
1881 }
1882 }
1884 static void pdf_write_text(pdf_state *state, gfx_node_t *node,
1885 int last_was_text, int next_is_text)
1886 {
1887 char tmp[30];
1888 pdf_buffer *s = &state->graph_stream;
1889 const unsigned char *p;
1890 pdf_font *font = pdf_find_font(state, node);
1891 double x = node->x;
1892 double y = state->page_height - node->y;
1893 double dx = 0, dy = 0;
1894 double cos_a = 0, sin_a = 0;
1895 if (font == NULL) {
1896 rrd_set_error("font disappeared");
1897 state->has_failed = 1;
1898 return;
1899 }
1900 switch(node->valign){
1901 case GFX_V_TOP: dy = -node->size; break;
1902 case GFX_V_CENTER: dy = -node->size / 3.0; break;
1903 case GFX_V_BOTTOM: break;
1904 case GFX_V_NULL: break;
1905 }
1906 switch (node->halign) {
1907 case GFX_H_RIGHT: dx = -afm_get_text_width(0, font->ps_font,
1908 node->size, node->tabwidth, node->text);
1909 break;
1910 case GFX_H_CENTER: dx = -afm_get_text_width(0, font->ps_font,
1911 node->size, node->tabwidth, node->text) / 2;
1912 break;
1913 case GFX_H_LEFT: break;
1914 case GFX_H_NULL: break;
1915 }
1916 pdf_set_fill_color(s, node->color);
1917 if (node->angle != 0) {
1918 double a = 2 * M_PI * -node->angle / 360.0;
1919 double new_x, new_y;
1920 cos_a = cos(a);
1921 sin_a = sin(a);
1922 new_x = cos_a * dx - sin_a * dy + x;
1923 new_y = sin_a * dx + cos_a * dy + y;
1924 x = new_x;
1925 y = new_y;
1926 } else {
1927 x += dx;
1928 y += dy;
1929 }
1930 if (!last_was_text)
1931 pdf_puts(s, "BT\n");
1932 if (state->font_id != font->obj.id || node->size != state->font_size) {
1933 state->font_id = font->obj.id;
1934 state->font_size = node->size;
1935 pdf_puts(s, "/F");
1936 pdf_putint(s, font->obj.id);
1937 pdf_puts(s, " ");
1938 pdf_putnumber(s, node->size);
1939 pdf_puts(s, " Tf\n");
1940 }
1941 if (node->angle == 0) {
1942 pdf_puts(s, "1 0 0 1 ");
1943 } else {
1944 pdf_putnumber(s, cos_a);
1945 pdf_puts(s, " ");
1946 pdf_putnumber(s, sin_a);
1947 pdf_puts(s, " ");
1948 pdf_putnumber(s, -sin_a);
1949 pdf_puts(s, " ");
1950 pdf_putnumber(s, cos_a);
1951 pdf_puts(s, " ");
1952 }
1953 pdf_putnumber(s, x);
1954 pdf_puts(s, " ");
1955 pdf_putnumber(s, y);
1956 pdf_puts(s, " Tm\n");
1957 pdf_puts(s, "(");
1958 for (p = (const unsigned char*)node->text; *p; p++) {
1959 switch (*p) {
1960 case '(':
1961 case ')':
1962 case '\\':
1963 case '\n':
1964 case '\r':
1965 case '\t':
1966 pdf_puts(s, "\\");
1967 /* fall-through */
1968 default:
1969 if (*p >= 126) {
1970 snprintf(tmp, sizeof(tmp), "\\%03o", *p);
1971 pdf_puts(s, tmp);
1972 } else {
1973 pdf_put(s, (const char*)p, 1);
1974 }
1975 }
1976 }
1977 pdf_puts(s, ") Tj\n");
1978 if (!next_is_text)
1979 pdf_puts(s, "ET\n");
1980 }
1982 static void pdf_write_content(pdf_state *state)
1983 {
1984 gfx_node_t *node;
1985 int last_was_text = 0, next_is_text;
1986 for (node = state->canvas->firstnode; node; node = node->next) {
1987 switch (node->type) {
1988 case GFX_LINE:
1989 case GFX_AREA:
1990 pdf_write_linearea(state, node);
1991 break;
1992 case GFX_TEXT:
1993 next_is_text = node->next && node->next->type == GFX_TEXT;
1994 pdf_write_text(state, node, last_was_text, next_is_text);
1995 break;
1996 }
1997 last_was_text = node->type == GFX_TEXT;
1998 }
1999 }
2001 static void pdf_init_document(pdf_state *state)
2002 {
2003 pdf_init_buffer(state, &state->pdf_header);
2004 pdf_init_dict(state, &state->catalog_obj);
2005 pdf_init_dict(state, &state->pages_obj);
2006 pdf_init_dict(state, &state->page1_obj);
2007 pdf_init_dict(state, &state->fontsdict_obj);
2008 pdf_create_fonts(state);
2009 if (state->has_failed)
2010 return;
2011 /* make stream last object in file */
2012 pdf_init_object(state, &state->graph_stream);
2013 state->graph_stream.is_stream = 1;
2014 }
2016 static void pdf_setup_document(pdf_state *state)
2017 {
2018 /* all objects created by now, so init code can reference them */
2019 /* HEADER */
2020 pdf_puts(&state->pdf_header, "%PDF-1.3\n");
2021 /* following 8 bit comment is recommended by Adobe for
2022 indicating binary file to file transfer applications */
2023 pdf_puts(&state->pdf_header, "%\xE2\xE3\xCF\xD3\n");
2024 /* CATALOG */
2025 pdf_putsi(&state->catalog_obj, "/Type /Catalog\n");
2026 pdf_putsi(&state->catalog_obj, "/Pages ");
2027 pdf_putint(&state->catalog_obj, state->pages_obj.id);
2028 pdf_puts(&state->catalog_obj, " 0 R\n");
2029 /* PAGES */
2030 pdf_putsi(&state->pages_obj, "/Type /Pages\n");
2031 pdf_putsi(&state->pages_obj, "/Kids [");
2032 pdf_putint(&state->pages_obj, state->page1_obj.id);
2033 pdf_puts(&state->pages_obj, " 0 R]\n");
2034 pdf_putsi(&state->pages_obj, "/Count 1\n");
2035 /* PAGE 1 */
2036 pdf_putsi(&state->page1_obj, "/Type /Page\n");
2037 pdf_putsi(&state->page1_obj, "/Parent ");
2038 pdf_putint(&state->page1_obj, state->pages_obj.id);
2039 pdf_puts(&state->page1_obj, " 0 R\n");
2040 pdf_putsi(&state->page1_obj, "/MediaBox [0 0 ");
2041 pdf_putint(&state->page1_obj, state->page_width);
2042 pdf_puts(&state->page1_obj, " ");
2043 pdf_putint(&state->page1_obj, state->page_height);
2044 pdf_puts(&state->page1_obj, "]\n");
2045 pdf_putsi(&state->page1_obj, "/Contents ");
2046 pdf_putint(&state->page1_obj, state->graph_stream.id);
2047 pdf_puts(&state->page1_obj, " 0 R\n");
2048 pdf_putsi(&state->page1_obj, "/Resources << /Font ");
2049 pdf_putint(&state->page1_obj, state->fontsdict_obj.id);
2050 pdf_puts(&state->page1_obj, " 0 R >>\n");
2051 }
2053 static void pdf_write_string_to_file(pdf_state *state, const char *text)
2054 {
2055 fputs(text, state->fp);
2056 state->pdf_file_pos += strlen(text);
2057 }
2059 static void pdf_write_buf_to_file(pdf_state *state, pdf_buffer *buf)
2060 {
2061 char tmp[40];
2062 buf->pdf_file_pos = state->pdf_file_pos;
2063 if (buf->is_obj) {
2064 snprintf(tmp, sizeof(tmp), "%d 0 obj\n", buf->id);
2065 pdf_write_string_to_file(state, tmp);
2066 }
2067 if (buf->is_dict)
2068 pdf_write_string_to_file(state, "<<\n");
2069 if (buf->is_stream) {
2070 snprintf(tmp, sizeof(tmp), "<< /Length %d >>\n", buf->current_size);
2071 pdf_write_string_to_file(state, tmp);
2072 pdf_write_string_to_file(state, "stream\n");
2073 }
2074 fwrite(buf->data, 1, buf->current_size, state->fp);
2075 state->pdf_file_pos += buf->current_size;
2076 if (buf->is_stream)
2077 pdf_write_string_to_file(state, "endstream\n");
2078 if (buf->is_dict)
2079 pdf_write_string_to_file(state, ">>\n");
2080 if (buf->is_obj)
2081 pdf_write_string_to_file(state, "endobj\n");
2082 }
2084 static void pdf_write_to_file(pdf_state *state)
2085 {
2086 pdf_buffer *buf = state->first_buffer;
2087 int xref_pos;
2088 state->pdf_file_pos = 0;
2089 pdf_write_buf_to_file(state, &state->pdf_header);
2090 while (buf) {
2091 if (buf->is_obj)
2092 pdf_write_buf_to_file(state, buf);
2093 buf = buf->next_buffer;
2094 }
2095 xref_pos = state->pdf_file_pos;
2096 fprintf(state->fp, "xref\n");
2097 fprintf(state->fp, "%d %d\n", 0, state->last_obj_id + 1);
2098 /* TOC lines must be exactly 20 bytes including \n */
2099 fprintf(state->fp, "%010d %05d f\x20\n", 0, 65535);
2100 for (buf = state->first_buffer; buf; buf = buf->next_buffer) {
2101 if (buf->is_obj)
2102 fprintf(state->fp, "%010d %05d n\x20\n", buf->pdf_file_pos, 0);
2103 }
2104 fprintf(state->fp, "trailer\n");
2105 fprintf(state->fp, "<<\n");
2106 fprintf(state->fp, "\t/Size %d\n", state->last_obj_id + 1);
2107 fprintf(state->fp, "\t/Root %d 0 R\n", state->catalog_obj.id);
2108 fprintf(state->fp, ">>\n");
2109 fprintf(state->fp, "startxref\n");
2110 fprintf(state->fp, "%d\n", xref_pos);
2111 fputs("%%EOF\n", state->fp);
2112 }
2114 static void pdf_free_resources(pdf_state *state)
2115 {
2116 pdf_buffer *buf = state->first_buffer;
2117 while (buf) {
2118 free(buf->data);
2119 buf->data = NULL;
2120 buf->alloc_size = buf->current_size = 0;
2121 buf = buf->next_buffer;
2122 }
2123 while (state->font_list) {
2124 pdf_font *next = state->font_list->next;
2125 free(state->font_list);
2126 state->font_list = next;
2127 }
2128 }
2130 int gfx_render_pdf (gfx_canvas_t *canvas,
2131 art_u32 width, art_u32 height,
2132 gfx_color_t background, FILE *fp){
2133 struct pdf_state state;
2134 memset(&state, 0, sizeof(pdf_state));
2135 state.fp = fp;
2136 state.canvas = canvas;
2137 state.page_width = width;
2138 state.page_height = height;
2139 state.font_id = -1;
2140 state.font_size = -1;
2141 state.font_list = NULL;
2142 state.linecap = -1;
2143 state.linejoin = -1;
2144 pdf_init_document(&state);
2145 /*
2146 pdf_set_color(&state, background);
2147 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
2148 height, width, height, width);
2149 */
2150 if (!state.has_failed)
2151 pdf_write_content(&state);
2152 if (!state.has_failed)
2153 pdf_setup_document(&state);
2154 if (!state.has_failed)
2155 pdf_write_to_file(&state);
2156 pdf_free_resources(&state);
2157 return state.has_failed ? -1 : 0;
2158 }