1 /****************************************************************************
2 * RRDtool 1.2.x Copyright Tobias 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);
214 /* if (angle != 0.0){*/
215 /* currently we only support 0 and 270 */
216 /* angle = 270.0;
217 }*/
219 node->text = strdup(text);
220 node->size = size;
221 node->filename = strdup(font);
222 node->x = x;
223 node->y = y;
224 node->angle = angle;
225 node->color = color;
226 node->tabwidth = tabwidth;
227 node->halign = h_align;
228 node->valign = v_align;
229 #if 0
230 /* debugging: show text anchor
231 green is along x-axis, red is downward y-axis */
232 if (1) {
233 double a = 2 * M_PI * -node->angle / 360.0;
234 double cos_a = cos(a);
235 double sin_a = sin(a);
236 double len = 3;
237 gfx_new_line(canvas,
238 x, y,
239 x + len * cos_a, y - len * sin_a,
240 0.2, 0x00FF0000);
241 gfx_new_line(canvas,
242 x, y,
243 x + len * sin_a, y + len * cos_a,
244 0.2, 0xFF000000);
245 }
246 #endif
247 return node;
248 }
250 int gfx_render(gfx_canvas_t *canvas,
251 art_u32 width, art_u32 height,
252 gfx_color_t background, FILE *fp){
253 switch (canvas->imgformat) {
254 case IF_PNG:
255 return gfx_render_png (canvas, width, height, background, fp);
256 case IF_SVG:
257 return gfx_render_svg (canvas, width, height, background, fp);
258 case IF_EPS:
259 return gfx_render_eps (canvas, width, height, background, fp);
260 case IF_PDF:
261 return gfx_render_pdf (canvas, width, height, background, fp);
262 default:
263 return -1;
264 }
265 }
267 static void gfx_string_destroy ( gfx_string string ) {
268 unsigned int n;
269 if (string->glyphs) {
270 for (n=0; n<string->num_glyphs; ++n)
271 FT_Done_Glyph (string->glyphs[n].image);
272 free (string->glyphs);
273 }
274 free (string);
275 }
278 double gfx_get_text_width ( gfx_canvas_t *canvas,
279 double start, char* font, double size,
280 double tabwidth, char* text, int rotation){
281 switch (canvas->imgformat) {
282 case IF_PNG:
283 return gfx_get_text_width_libart (start, font, size, tabwidth, text, rotation);
284 case IF_SVG: /* fall through */
285 case IF_EPS:
286 case IF_PDF:
287 return afm_get_text_width(start, font, size, tabwidth, text);
288 default:
289 return size * strlen(text);
290 }
291 }
293 double gfx_get_text_width_libart (
294 double start, char* font, double size,
295 double tabwidth, char* text, int rotation){
297 int error;
298 double text_width=0;
299 FT_Face face;
300 FT_Library library=NULL;
301 gfx_string string;
303 FT_Init_FreeType( &library );
304 error = FT_New_Face( library, font, 0, &face );
305 if ( error ) return -1;
306 error = FT_Set_Char_Size(face, size*64,size*64, 100,100);
307 if ( error ) return -1;
309 string = gfx_string_create( face, text, rotation,tabwidth);
310 text_width = string->width;
311 gfx_string_destroy(string);
312 FT_Done_FreeType(library);
313 return text_width/64;
314 }
316 static void gfx_libart_close_path(gfx_node_t *node, ArtVpath **vec)
317 {
318 /* libart must have end==start for closed paths,
319 even if using ART_MOVETO and not ART_MOVETO_OPEN
320 so add extra point which is the same as the starting point */
321 int points_max = node->points; /* scaled array has exact size */
322 int points = node->points - 1;
323 art_vpath_add_point (vec, &points, &points_max, ART_LINETO,
324 (**vec).x, (**vec).y);
325 art_vpath_add_point (vec, &points, &points_max, ART_END, 0, 0);
326 }
328 static void gfx_round_scaled_coordinates(ArtVpath *vec)
329 {
330 while (vec->code != ART_END) {
331 vec->x = floor(vec->x - LINEOFFSET + 0.5) + LINEOFFSET;
332 vec->y = floor(vec->y - LINEOFFSET + 0.5) + LINEOFFSET;
333 vec++;
334 }
335 }
337 /* find bbox of a string */
338 static void compute_string_bbox(gfx_string string) {
339 unsigned int n;
340 FT_BBox bbox;
342 bbox.xMin = bbox.yMin = 32000;
343 bbox.xMax = bbox.yMax = -32000;
344 for ( n = 0; n < string->num_glyphs; n++ ) {
345 FT_BBox glyph_bbox;
346 FT_Glyph_Get_CBox( string->glyphs[n].image, ft_glyph_bbox_gridfit,
347 &glyph_bbox );
348 if (glyph_bbox.xMin < bbox.xMin) {
349 bbox.xMin = glyph_bbox.xMin;
350 }
351 if (glyph_bbox.yMin < bbox.yMin) {
352 bbox.yMin = glyph_bbox.yMin;
353 }
354 if (glyph_bbox.xMax > bbox.xMax) {
355 bbox.xMax = glyph_bbox.xMax;
356 }
357 if (glyph_bbox.yMax > bbox.yMax) {
358 bbox.yMax = glyph_bbox.yMax;
359 }
360 }
361 if ( bbox.xMin > bbox.xMax ) {
362 bbox.xMin = 0;
363 bbox.yMin = 0;
364 bbox.xMax = 0;
365 bbox.yMax = 0;
366 }
367 string->bbox.xMin = bbox.xMin;
368 string->bbox.xMax = bbox.xMax;
369 string->bbox.yMin = bbox.yMin;
370 string->bbox.yMax = bbox.yMax;
371 }
373 /* create a free type glyph string */
374 gfx_string gfx_string_create(FT_Face face,const char *text,
375 int rotation, double tabwidth)
376 {
378 FT_GlyphSlot slot = face->glyph; /* a small shortcut */
379 FT_Bool use_kerning;
380 FT_UInt previous;
381 FT_Vector ft_pen;
383 gfx_string string;
384 gfx_char glyph; /* current glyph in table */
385 unsigned int n;
386 int error;
387 int gottab;
389 ft_pen.x = 0; /* start at (0,0) !! */
390 ft_pen.y = 0;
392 string = (gfx_string) malloc (sizeof(struct gfx_string_s));
393 string->width = 0;
394 string->height = 0;
395 string->count = strlen (text);
396 string->glyphs = (gfx_char) calloc (string->count,sizeof(struct gfx_char_s));
397 string->num_glyphs = 0;
398 string->transform.xx = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
399 string->transform.xy = (FT_Fixed)(-sin(M_PI*(rotation)/180.0)*0x10000);
400 string->transform.yx = (FT_Fixed)( sin(M_PI*(rotation)/180.0)*0x10000);
401 string->transform.yy = (FT_Fixed)( cos(M_PI*(rotation)/180.0)*0x10000);
403 use_kerning = FT_HAS_KERNING(face);
404 previous = 0;
405 glyph = string->glyphs;
406 for (n=0; n<string->count; n++, glyph++) {
407 FT_Vector vec;
408 /* handle the tabs ...
409 have a witespace glyph inserted, but set its width such that the distance
410 of the new right edge is x times tabwidth from 0,0 where x is an integer. */
411 char letter = text[n];
412 gottab = 0;
413 if (letter == '\\' && n+1 < string->count && text[n+1] == 't'){
414 /* we have a tab here so skip the backslash and
415 set t to ' ' so that we get a white space */
416 gottab = 1;
417 n++;
418 letter = ' ';
419 }
420 if (letter == '\t'){
421 letter = ' ';
422 gottab = 1 ;
423 }
424 /* initialize each struct gfx_char_s */
425 glyph->index = 0;
426 glyph->pos.x = 0;
427 glyph->pos.y = 0;
428 glyph->image = NULL;
430 glyph->index = FT_Get_Char_Index( face, letter );
432 /* compute glyph origin */
433 if ( use_kerning && previous && glyph->index ) {
434 FT_Vector kerning;
435 FT_Get_Kerning (face, previous, glyph->index,
436 ft_kerning_default, &kerning);
437 ft_pen.x += kerning.x;
438 ft_pen.y += kerning.y;
439 }
441 /* load the glyph image (in its native format) */
442 /* for now, we take a monochrome glyph bitmap */
443 error = FT_Load_Glyph (face, glyph->index, FT_LOAD_DEFAULT);
444 if (error) {
445 fprintf (stderr, "couldn't load glyph: %c\n", letter);
446 continue;
447 }
448 error = FT_Get_Glyph (slot, &glyph->image);
449 if (error) {
450 fprintf (stderr, "couldn't get glyph from slot: %c\n", letter);
451 continue;
452 }
453 /* if we are in tabbing mode, we replace the tab with a space and shift the position
454 of the space so that its left edge is where the tab was supposed to land us */
455 if (gottab){
456 /* we are in gridfitting mode so the calculations happen in 1/64 pixles */
457 ft_pen.x = tabwidth*64.0 * (float)(1 + (long)(ft_pen.x / (tabwidth * 64.0))) - slot->advance.x;
458 }
459 /* store current pen position */
460 glyph->pos.x = ft_pen.x;
461 glyph->pos.y = ft_pen.y;
464 ft_pen.x += slot->advance.x;
465 ft_pen.y += slot->advance.y;
467 /* rotate glyph */
468 vec = glyph->pos;
469 FT_Vector_Transform (&vec, &string->transform);
470 error = FT_Glyph_Transform (glyph->image, &string->transform, &vec);
471 if (error) {
472 fprintf (stderr, "couldn't transform glyph\n");
473 continue;
474 }
476 /* convert to a bitmap - destroy native image */
477 error = FT_Glyph_To_Bitmap (&glyph->image, FT_RENDER_MODE_NORMAL, 0, 1);
478 if (error) {
479 fprintf (stderr, "couldn't convert glyph to bitmap\n");
480 continue;
481 }
483 /* increment number of glyphs */
484 previous = glyph->index;
485 string->num_glyphs++;
486 }
487 /* printf ("number of glyphs = %d\n", string->num_glyphs);*/
488 compute_string_bbox( string );
489 /* the last character was a tab */
490 if (gottab) {
491 string->width = ft_pen.x;
492 } else {
493 string->width = string->bbox.xMax - string->bbox.xMin;
494 }
495 string->height = string->bbox.yMax - string->bbox.yMin;
496 return string;
497 }
500 static int gfx_save_png (art_u8 *buffer, FILE *fp,
501 long width, long height, long bytes_per_pixel);
502 /* render grafics into png image */
504 int gfx_render_png (gfx_canvas_t *canvas,
505 art_u32 width, art_u32 height,
506 gfx_color_t background, FILE *fp){
509 FT_Library library;
510 gfx_node_t *node = canvas->firstnode;
511 art_u8 red = background >> 24, green = (background >> 16) & 0xff;
512 art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
513 unsigned long pys_width = width * canvas->zoom;
514 unsigned long pys_height = height * canvas->zoom;
515 const int bytes_per_pixel = 3;
516 unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
517 art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
518 art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height);
519 FT_Init_FreeType( &library );
520 while(node){
521 switch (node->type) {
522 case GFX_LINE:
523 case GFX_AREA: {
524 ArtVpath *vec;
525 double dst[6];
526 ArtSVP *svp;
527 art_affine_scale(dst,canvas->zoom,canvas->zoom);
528 vec = art_vpath_affine_transform(node->path,dst);
529 if (node->closed_path)
530 gfx_libart_close_path(node, &vec);
531 gfx_round_scaled_coordinates(vec);
532 if(node->type == GFX_LINE){
533 svp = art_svp_vpath_stroke ( vec, ART_PATH_STROKE_JOIN_ROUND,
534 ART_PATH_STROKE_CAP_ROUND,
535 node->size*canvas->zoom,1,1);
536 } else {
537 svp = art_svp_from_vpath ( vec );
538 }
539 art_free(vec);
540 art_rgb_svp_alpha (svp ,0,0, pys_width, pys_height,
541 node->color, buffer, rowstride, NULL);
542 art_free(svp);
543 break;
544 }
545 case GFX_TEXT: {
546 unsigned int n;
547 int error;
548 art_u8 fcolor[3],falpha;
549 FT_Face face;
550 gfx_char glyph;
551 gfx_string string;
552 FT_Vector vec; /* 26.6 */
554 float pen_x = 0.0 , pen_y = 0.0;
555 /* double x,y; */
556 long ix,iy,iz;
558 fcolor[0] = node->color >> 24;
559 fcolor[1] = (node->color >> 16) & 0xff;
560 fcolor[2] = (node->color >> 8) & 0xff;
561 falpha = node->color & 0xff;
562 error = FT_New_Face( library,
563 (char *)node->filename,
564 0,
565 &face );
566 if ( error ) break;
568 error = FT_Set_Char_Size(face, /* handle to face object */
569 (long)(node->size*64),
570 (long)(node->size*64),
571 (long)(100*canvas->zoom),
572 (long)(100*canvas->zoom));
573 if ( error ) break;
574 pen_x = node->x * canvas->zoom;
575 pen_y = node->y * canvas->zoom;
577 string = gfx_string_create (face, node->text, node->angle, node->tabwidth);
578 switch(node->halign){
579 case GFX_H_RIGHT: vec.x = -string->bbox.xMax;
580 break;
581 case GFX_H_CENTER: vec.x = abs(string->bbox.xMax) >= abs(string->bbox.xMin) ?
582 -string->bbox.xMax/2:-string->bbox.xMin/2;
583 break;
584 case GFX_H_LEFT: vec.x = -string->bbox.xMin;
585 break;
586 case GFX_H_NULL: vec.x = 0;
587 break;
588 }
590 switch(node->valign){
591 case GFX_V_TOP: vec.y = string->bbox.yMax;
592 break;
593 case GFX_V_CENTER: vec.y = abs(string->bbox.yMax) >= abs(string->bbox.yMin) ?
594 string->bbox.yMax/2:string->bbox.yMin/2;
595 break;
596 case GFX_V_BOTTOM: vec.y = 0;
597 break;
598 case GFX_V_NULL: vec.y = 0;
599 break;
600 }
601 pen_x += vec.x/64;
602 pen_y += vec.y/64;
603 glyph = string->glyphs;
604 for(n=0; n<string->num_glyphs; ++n, ++glyph) {
605 int gr;
606 FT_Glyph image;
607 FT_BitmapGlyph bit;
609 /* make copy to transform */
610 if (! glyph->image) {
611 fprintf (stderr, "no image\n");
612 continue;
613 }
614 error = FT_Glyph_Copy (glyph->image, &image);
615 if (error) {
616 fprintf (stderr, "couldn't copy image\n");
617 continue;
618 }
620 /* transform it */
621 vec = glyph->pos;
622 FT_Vector_Transform (&vec, &string->transform);
624 bit = (FT_BitmapGlyph) image;
626 gr = bit->bitmap.num_grays -1;
627 for (iy=0; iy < bit->bitmap.rows; iy++){
628 long buf_y = iy+(pen_y+0.5)-bit->top;
629 if (buf_y < 0 || buf_y >= (long)pys_height) continue;
630 buf_y *= rowstride;
631 for (ix=0;ix < bit->bitmap.width;ix++){
632 long buf_x = ix + (pen_x + 0.5) + (double)bit->left ;
633 art_u8 font_alpha;
635 if (buf_x < 0 || buf_x >= (long)pys_width) continue;
636 buf_x *= bytes_per_pixel ;
637 font_alpha = *(bit->bitmap.buffer + iy * bit->bitmap.width + ix);
638 font_alpha = (art_u8)((double)font_alpha / gr * falpha);
639 for (iz = 0; iz < 3; iz++){
640 art_u8 *orig = buffer + buf_y + buf_x + iz;
641 *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) +
642 (double)fcolor[iz] / gr * (font_alpha));
643 }
644 }
645 }
646 FT_Done_Glyph (image);
647 }
648 gfx_string_destroy(string);
649 }
650 }
651 node = node->next;
652 }
653 gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
654 art_free(buffer);
655 FT_Done_FreeType( library );
656 return 0;
657 }
659 /* free memory used by nodes this will also remove memory required for
660 associated paths and svcs ... but not for text strings */
661 int
662 gfx_destroy (gfx_canvas_t *canvas){
663 gfx_node_t *next,*node = canvas->firstnode;
664 while(node){
665 next = node->next;
666 art_free(node->path);
667 art_free(node->svp);
668 free(node->text);
669 free(node->filename);
670 art_free(node);
671 node = next;
672 }
673 return 0;
674 }
676 static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){
677 png_structp png_ptr = NULL;
678 png_infop info_ptr = NULL;
679 int i;
680 png_bytep *row_pointers;
681 int rowstride = width * bytes_per_pixel;
682 png_text text[2];
684 if (fp == NULL)
685 return (1);
687 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
688 if (png_ptr == NULL)
689 {
690 return (1);
691 }
692 row_pointers = (png_bytepp)png_malloc(png_ptr,
693 height*sizeof(png_bytep));
695 info_ptr = png_create_info_struct(png_ptr);
697 if (info_ptr == NULL)
698 {
699 png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
700 return (1);
701 }
703 if (setjmp(png_jmpbuf(png_ptr)))
704 {
705 /* If we get here, we had a problem writing the file */
706 png_destroy_write_struct(&png_ptr, &info_ptr);
707 return (1);
708 }
710 png_init_io(png_ptr, fp);
711 png_set_IHDR (png_ptr, info_ptr,width, height,
712 8, PNG_COLOR_TYPE_RGB,
713 PNG_INTERLACE_NONE,
714 PNG_COMPRESSION_TYPE_DEFAULT,
715 PNG_FILTER_TYPE_DEFAULT);
717 text[0].key = "Software";
718 text[0].text = "RRDtool, Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch";
719 text[0].compression = PNG_TEXT_COMPRESSION_NONE;
720 png_set_text (png_ptr, info_ptr, text, 1);
722 /* Write header data */
723 png_write_info (png_ptr, info_ptr);
725 for (i = 0; i < height; i++)
726 row_pointers[i] = (png_bytep) (buffer + i*rowstride);
728 png_write_image(png_ptr, row_pointers);
729 png_write_end(png_ptr, info_ptr);
730 png_destroy_write_struct(&png_ptr, &info_ptr);
731 return 1;
732 }
735 /* ------- SVG -------
736 SVG reference:
737 http://www.w3.org/TR/SVG/
738 */
739 static int svg_indent = 0;
740 static int svg_single_line = 0;
741 static const char *svg_default_font = "Helvetica";
742 typedef struct svg_dash
743 {
744 int dash_enable;
745 double dash_adjust, dash_len, dash_offset;
746 double adjusted_on, adjusted_off;
747 } svg_dash;
750 static void svg_print_indent(FILE *fp)
751 {
752 int i;
753 for (i = svg_indent - svg_single_line; i > 0; i--) {
754 putc(' ', fp);
755 putc(' ', fp);
756 }
757 }
759 static void svg_start_tag(FILE *fp, const char *name)
760 {
761 svg_print_indent(fp);
762 putc('<', fp);
763 fputs(name, fp);
764 svg_indent++;
765 }
767 static void svg_close_tag_single_line(FILE *fp)
768 {
769 svg_single_line++;
770 putc('>', fp);
771 }
773 static void svg_close_tag(FILE *fp)
774 {
775 putc('>', fp);
776 if (!svg_single_line)
777 putc('\n', fp);
778 }
780 static void svg_end_tag(FILE *fp, const char *name)
781 {
782 /* name is NULL if closing empty-node tag */
783 svg_indent--;
784 if (svg_single_line)
785 svg_single_line--;
786 else if (name)
787 svg_print_indent(fp);
788 if (name != NULL) {
789 fputs("</", fp);
790 fputs(name, fp);
791 } else {
792 putc('/', fp);
793 }
794 svg_close_tag(fp);
795 }
797 static void svg_close_tag_empty_node(FILE *fp)
798 {
799 svg_end_tag(fp, NULL);
800 }
802 static void svg_write_text(FILE *fp, const char *text)
803 {
804 const unsigned char *p, *start, *last;
805 unsigned int ch;
806 p = (const unsigned char*)text;
807 if (!p)
808 return;
809 /* trim leading spaces */
810 while (*p == ' ')
811 p++;
812 start = p;
813 /* trim trailing spaces */
814 last = p - 1;
815 while ((ch = *p) != 0) {
816 if (ch != ' ')
817 last = p;
818 p++;
819 }
820 /* encode trimmed text */
821 p = start;
822 while (p <= last) {
823 ch = *p++;
824 ch = afm_host2unicode(ch); /* unsafe macro */
825 switch (ch) {
826 case '&': fputs("&", fp); break;
827 case '<': fputs("<", fp); break;
828 case '>': fputs(">", fp); break;
829 case '"': fputs(""", fp); break;
830 default:
831 if (ch >= 127)
832 fprintf(fp, "&#%d;", ch);
833 else
834 putc(ch, fp);
835 }
836 }
837 }
839 static void svg_format_number(char *buf, int bufsize, double d)
840 {
841 /* omit decimals if integer to reduce filesize */
842 char *p;
843 snprintf(buf, bufsize, "%.2f", d);
844 p = buf; /* doesn't trust snprintf return value */
845 while (*p)
846 p++;
847 while (--p > buf) {
848 char ch = *p;
849 if (ch == '0') {
850 *p = '\0'; /* zap trailing zeros */
851 continue;
852 }
853 if (ch == '.')
854 *p = '\0'; /* zap trailing dot */
855 break;
856 }
857 }
859 static void svg_write_number(FILE *fp, double d)
860 {
861 char buf[60];
862 svg_format_number(buf, sizeof(buf), d);
863 fputs(buf, fp);
864 }
866 static int svg_color_is_black(int c)
867 {
868 /* gfx_color_t is RRGGBBAA */
869 return c == 0x000000FF;
870 }
872 static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
873 {
874 /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
875 gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
876 gfx_color_t opacity = c & 0xFF;
877 fprintf(fp, " %s=\"", attr);
878 if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
879 /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
880 fprintf(fp, "#%03lX",
881 ( ((rrggbb >> 8) & 0xF00)
882 | ((rrggbb >> 4) & 0x0F0)
883 | ( rrggbb & 0x00F)));
884 } else {
885 fprintf(fp, "#%06lX", rrggbb);
886 }
887 fputs("\"", fp);
888 if (opacity != 0xFF) {
889 fprintf(fp, " stroke-opacity=\"");
890 svg_write_number(fp, opacity / 255.0);
891 fputs("\"", fp);
892 }
893 }
895 static void svg_get_dash(gfx_node_t *node, svg_dash *d)
896 {
897 double offset;
898 int mult;
899 if (node->dash_on <= 0 || node->dash_off <= 0) {
900 d->dash_enable = 0;
901 return;
902 }
903 d->dash_enable = 1;
904 d->dash_len = node->dash_on + node->dash_off;
905 /* dash on/off adjustment due to round caps */
906 d->dash_adjust = 0.8 * node->size;
907 d->adjusted_on = node->dash_on - d->dash_adjust;
908 if (d->adjusted_on < 0.01)
909 d->adjusted_on = 0.01;
910 d->adjusted_off = d->dash_len - d->adjusted_on;
911 /* dash offset calc */
912 if (node->path[0].x == node->path[1].x) /* only good for horz/vert lines */
913 offset = node->path[0].y;
914 else
915 offset = node->path[0].x;
916 mult = (int)fabs(offset / d->dash_len);
917 d->dash_offset = offset - mult * d->dash_len;
918 if (node->path[0].x < node->path[1].x || node->path[0].y < node->path[1].y)
919 d->dash_offset = d->dash_len - d->dash_offset;
920 }
922 static int svg_dash_equal(svg_dash *a, svg_dash *b)
923 {
924 if (a->dash_enable != b->dash_enable)
925 return 0;
926 if (a->adjusted_on != b->adjusted_on)
927 return 0;
928 if (a->adjusted_off != b->adjusted_off)
929 return 0;
930 /* rest of properties will be the same when on+off are */
931 return 1;
932 }
934 static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
935 {
936 svg_dash dash_info;
937 svg_get_dash(node, &dash_info);
938 fputs(" stroke-width=\"", fp);
939 svg_write_number(fp, node->size);
940 fputs("\"", fp);
941 svg_write_color(fp, node->color, "stroke");
942 fputs(" fill=\"none\"", fp);
943 if (dash_info.dash_enable) {
944 if (dash_info.dash_offset != 0) {
945 fputs(" stroke-dashoffset=\"", fp);
946 svg_write_number(fp, dash_info.dash_offset);
947 fputs("\"", fp);
948 }
949 fputs(" stroke-dasharray=\"", fp);
950 svg_write_number(fp, dash_info.adjusted_on);
951 fputs(",", fp);
952 svg_write_number(fp, dash_info.adjusted_off);
953 fputs("\"", fp);
954 }
955 }
957 static int svg_is_int_step(double a, double b)
958 {
959 double diff = fabs(a - b);
960 return floor(diff) == diff;
961 }
963 static int svg_path_straight_segment(FILE *fp,
964 double lastA, double currentA, double currentB,
965 gfx_node_t *node,
966 int segment_idx, int isx, char absChar, char relChar)
967 {
968 if (!svg_is_int_step(lastA, currentA)) {
969 putc(absChar, fp);
970 svg_write_number(fp, currentA);
971 return 0;
972 }
973 if (segment_idx < node->points - 1) {
974 ArtVpath *vec = node->path + segment_idx + 1;
975 if (vec->code == ART_LINETO) {
976 double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
977 double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
978 if (nextB == currentB
979 && ((currentA >= lastA) == (nextA >= currentA))
980 && svg_is_int_step(currentA, nextA)) {
981 return 1; /* skip to next as it is a straight line */
982 }
983 }
984 }
985 putc(relChar, fp);
986 svg_write_number(fp, currentA - lastA);
987 return 0;
988 }
990 static void svg_path(FILE *fp, gfx_node_t *node, int multi)
991 {
992 int i;
993 double lastX = 0, lastY = 0;
994 /* for straight lines <path..> tags take less space than
995 <line..> tags because of the efficient packing
996 in the 'd' attribute */
997 svg_start_tag(fp, "path");
998 if (!multi)
999 svg_common_path_attributes(fp, node);
1000 fputs(" d=\"", fp);
1001 /* specification of the 'd' attribute: */
1002 /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
1003 for (i = 0; i < node->points; i++) {
1004 ArtVpath *vec = node->path + i;
1005 double x = vec->x - LINEOFFSET;
1006 double y = vec->y - LINEOFFSET;
1007 switch (vec->code) {
1008 case ART_MOVETO_OPEN: /* fall-through */
1009 case ART_MOVETO:
1010 putc('M', fp);
1011 svg_write_number(fp, x);
1012 putc(',', fp);
1013 svg_write_number(fp, y);
1014 break;
1015 case ART_LINETO:
1016 /* try optimize filesize by using minimal lineto commands */
1017 /* without introducing rounding errors. */
1018 if (x == lastX) {
1019 if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
1020 continue;
1021 } else if (y == lastY) {
1022 if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
1023 continue;
1024 } else {
1025 putc('L', fp);
1026 svg_write_number(fp, x);
1027 putc(',', fp);
1028 svg_write_number(fp, y);
1029 }
1030 break;
1031 case ART_CURVETO: break; /* unsupported */
1032 case ART_END: break; /* nop */
1033 }
1034 lastX = x;
1035 lastY = y;
1036 }
1037 if (node->closed_path)
1038 fputs(" Z", fp);
1039 fputs("\"", fp);
1040 svg_close_tag_empty_node(fp);
1041 }
1043 static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
1044 {
1045 /* optimize for multiple paths with the same color, penwidth, etc. */
1046 int num = 1;
1047 gfx_node_t *node = *nodeR;
1048 gfx_node_t *next = node->next;
1049 while (next) {
1050 if (next->type != node->type
1051 || next->size != node->size
1052 || next->color != node->color
1053 || next->dash_on != node->dash_on
1054 || next->dash_off != node->dash_off)
1055 break;
1056 next = next->next;
1057 num++;
1058 }
1059 if (num == 1) {
1060 svg_path(fp, node, 0);
1061 return;
1062 }
1063 svg_start_tag(fp, "g");
1064 svg_common_path_attributes(fp, node);
1065 svg_close_tag(fp);
1066 while (num && node) {
1067 svg_path(fp, node, 1);
1068 if (!--num)
1069 break;
1070 node = node->next;
1071 *nodeR = node;
1072 }
1073 svg_end_tag(fp, "g");
1074 }
1076 static void svg_area(FILE *fp, gfx_node_t *node)
1077 {
1078 int i;
1079 double startX = 0, startY = 0;
1080 svg_start_tag(fp, "polygon");
1081 fputs(" ", fp);
1082 svg_write_color(fp, node->color, "fill");
1083 fputs(" points=\"", fp);
1084 for (i = 0; i < node->points; i++) {
1085 ArtVpath *vec = node->path + i;
1086 double x = vec->x - LINEOFFSET;
1087 double y = vec->y - LINEOFFSET;
1088 switch (vec->code) {
1089 case ART_MOVETO_OPEN: /* fall-through */
1090 case ART_MOVETO:
1091 svg_write_number(fp, x);
1092 putc(',', fp);
1093 svg_write_number(fp, y);
1094 startX = x;
1095 startY = y;
1096 break;
1097 case ART_LINETO:
1098 if (i == node->points - 2
1099 && node->path[i + 1].code == ART_END
1100 && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
1101 break; /* poly area always closed, no need for last point */
1102 }
1103 putc(' ', fp);
1104 svg_write_number(fp, x);
1105 putc(',', fp);
1106 svg_write_number(fp, y);
1107 break;
1108 case ART_CURVETO: break; /* unsupported */
1109 case ART_END: break; /* nop */
1110 }
1111 }
1112 fputs("\"", fp);
1113 svg_close_tag_empty_node(fp);
1114 }
1116 static void svg_text(FILE *fp, gfx_node_t *node)
1117 {
1118 double x = node->x - LINEOFFSET;
1119 double y = node->y - LINEOFFSET;
1120 if (node->angle != 0) {
1121 svg_start_tag(fp, "g");
1122 fputs(" transform=\"translate(", fp);
1123 svg_write_number(fp, x);
1124 fputs(",", fp);
1125 svg_write_number(fp, y);
1126 fputs(") rotate(", fp);
1127 svg_write_number(fp, node->angle);
1128 fputs(")\"", fp);
1129 x = y = 0;
1130 svg_close_tag(fp);
1131 }
1132 switch (node->valign) {
1133 case GFX_V_TOP: y += node->size; break;
1134 case GFX_V_CENTER: y += node->size / 3; break;
1135 case GFX_V_BOTTOM: break;
1136 case GFX_V_NULL: break;
1137 }
1138 svg_start_tag(fp, "text");
1139 fputs(" x=\"", fp);
1140 svg_write_number(fp, x);
1141 fputs("\" y=\"", fp);
1142 svg_write_number(fp, y);
1144 /* if (strcmp(node->filename, svg_default_font))
1145 fprintf(fp, " font-family=\"%s\"", node->filename);
1146 */
1147 fputs("\" font-family=\"Helvetica", fp);
1148 fputs("\" font-size=\"", fp);
1149 svg_write_number(fp, node->size);
1150 fputs("\"", fp);
1151 if (!svg_color_is_black(node->color))
1152 svg_write_color(fp, node->color, "fill");
1153 switch (node->halign) {
1154 case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
1155 case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
1156 case GFX_H_LEFT: break;
1157 case GFX_H_NULL: break;
1158 }
1159 svg_close_tag_single_line(fp);
1160 /* support for node->tabwidth missing */
1161 svg_write_text(fp, node->text);
1162 svg_end_tag(fp, "text");
1163 if (node->angle != 0)
1164 svg_end_tag(fp, "g");
1165 }
1167 int gfx_render_svg (gfx_canvas_t *canvas,
1168 art_u32 width, art_u32 height,
1169 gfx_color_t background, FILE *fp){
1170 gfx_node_t *node = canvas->firstnode;
1171 fputs(
1172 "<?xml version=\"1.0\" standalone=\"no\"?>\n"
1173 "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
1174 " \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
1175 "<!--\n"
1176 " SVG file created by RRDtool,\n"
1177 " Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
1178 "\n"
1179 " The width/height attributes in the outhermost svg node\n"
1180 " are just default sizes for the browser which is used\n"
1181 " if the svg file is openened directly without being\n"
1182 " embedded in an html file.\n"
1183 " The viewBox is the local coord system for rrdtool.\n"
1184 "-->\n", fp);
1185 svg_start_tag(fp, "svg");
1186 fputs(" width=\"", fp);
1187 svg_write_number(fp, width * canvas->zoom);
1188 fputs("\" height=\"", fp);
1189 svg_write_number(fp, height * canvas->zoom);
1190 fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
1191 svg_write_number(fp, -LINEOFFSET);
1192 fputs(" ", fp);
1193 svg_write_number(fp, -LINEOFFSET);
1194 fputs(" ", fp);
1195 svg_write_number(fp, width - LINEOFFSET);
1196 fputs(" ", fp);
1197 svg_write_number(fp, height - LINEOFFSET);
1198 fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
1199 fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
1200 fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
1201 svg_close_tag(fp);
1202 svg_start_tag(fp, "rect");
1203 fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
1204 svg_write_color(fp, background, "fill");
1205 svg_close_tag_empty_node(fp);
1206 while (node) {
1207 switch (node->type) {
1208 case GFX_LINE:
1209 svg_multi_path(fp, &node);
1210 break;
1211 case GFX_AREA:
1212 svg_area(fp, node);
1213 break;
1214 case GFX_TEXT:
1215 svg_text(fp, node);
1216 }
1217 node = node->next;
1218 }
1219 svg_end_tag(fp, "svg");
1220 return 0;
1221 }
1223 /* ------- EPS -------
1224 EPS and Postscript references:
1225 http://partners.adobe.com/asn/developer/technotes/postscript.html
1226 */
1228 typedef struct eps_font
1229 {
1230 const char *ps_font;
1231 int id;
1232 struct eps_font *next;
1233 } eps_font;
1235 typedef struct eps_state
1236 {
1237 FILE *fp;
1238 gfx_canvas_t *canvas;
1239 art_u32 page_width, page_height;
1240 eps_font *font_list;
1241 /*--*/
1242 gfx_color_t color;
1243 const char *font;
1244 double font_size;
1245 double line_width;
1246 int linecap, linejoin;
1247 int has_dash;
1248 } eps_state;
1250 static void eps_set_color(eps_state *state, gfx_color_t color)
1251 {
1252 /* gfx_color_t is RRGGBBAA */
1253 if (state->color == color)
1254 return;
1255 fprintf(state->fp, "%d %d %d Rgb\n",
1256 (int)((color >> 24) & 255),
1257 (int)((color >> 16) & 255),
1258 (int)((color >> 8) & 255));
1259 state->color = color;
1260 }
1262 static int eps_add_font(eps_state *state, gfx_node_t *node)
1263 {
1264 /* The fonts list could be postponed to the end using
1265 (atend), but let's be nice and have them in the header. */
1266 const char *ps_font = afm_get_font_postscript_name(node->filename);
1267 eps_font *ef;
1268 for (ef = state->font_list; ef; ef = ef->next) {
1269 if (!strcmp(ps_font, ef->ps_font))
1270 return 0;
1271 }
1272 ef = malloc(sizeof(eps_font));
1273 if (ef == NULL) {
1274 rrd_set_error("malloc for eps_font");
1275 return -1;
1276 }
1277 ef->next = state->font_list;
1278 ef->ps_font = ps_font;
1279 state->font_list = ef;
1280 return 0;
1281 }
1283 static void eps_list_fonts(eps_state *state, const char *dscName)
1284 {
1285 eps_font *ef;
1286 int lineLen = strlen(dscName);
1287 if (!state->font_list)
1288 return;
1289 fputs(dscName, state->fp);
1290 for (ef = state->font_list; ef; ef = ef->next) {
1291 int nameLen = strlen(ef->ps_font);
1292 if (lineLen + nameLen > 100 && lineLen) {
1293 fputs("\n", state->fp);
1294 fputs("%%- \n", state->fp);
1295 lineLen = 5;
1296 } else {
1297 fputs(" ", state->fp);
1298 lineLen++;
1299 }
1300 fputs(ef->ps_font, state->fp);
1301 lineLen += nameLen;
1302 }
1303 fputs("\n", state->fp);
1304 }
1306 static void eps_define_fonts(eps_state *state)
1307 {
1308 eps_font *ef;
1309 if (!state->font_list)
1310 return;
1311 for (ef = state->font_list; ef; ef = ef->next) {
1312 /* PostScript¨ LANGUAGE REFERENCE third edition
1313 page 349 */
1314 fprintf(state->fp,
1315 "%%\n"
1316 "/%s findfont dup length dict begin\n"
1317 "{ 1 index /FID ne {def} {pop pop} ifelse } forall\n"
1318 "/Encoding ISOLatin1Encoding def\n"
1319 "currentdict end\n"
1320 "/%s-ISOLatin1 exch definefont pop\n"
1321 "/SetFont-%s { /%s-ISOLatin1 findfont exch scalefont setfont } bd\n",
1322 ef->ps_font, ef->ps_font, ef->ps_font, ef->ps_font);
1323 }
1324 }
1326 static int eps_prologue(eps_state *state)
1327 {
1328 gfx_node_t *node;
1329 fputs(
1330 "%!PS-Adobe-3.0 EPSF-3.0\n"
1331 "%%Creator: RRDtool 1.1.x, Tobias Oetiker, http://tobi.oetiker.ch\n"
1332 /* can't like weird chars here */
1333 "%%Title: (RRDtool output)\n"
1334 "%%DocumentData: Clean7Bit\n"
1335 "", state->fp);
1336 fprintf(state->fp, "%%%%BoundingBox: 0 0 %d %d\n",
1337 state->page_width, state->page_height);
1338 for (node = state->canvas->firstnode; node; node = node->next) {
1339 if (node->type == GFX_TEXT && eps_add_font(state, node) == -1)
1340 return -1;
1341 }
1342 eps_list_fonts(state, "%%DocumentFonts:");
1343 eps_list_fonts(state, "%%DocumentNeededFonts:");
1344 fputs(
1345 "%%EndComments\n"
1346 "%%BeginProlog\n"
1347 "%%EndProlog\n" /* must have, or BoundingBox is ignored */
1348 "/bd { bind def } bind def\n"
1349 "", state->fp);
1350 fprintf(state->fp, "/X { %.2f add } bd\n", LINEOFFSET);
1351 fputs(
1352 "/X2 {X exch X exch} bd\n"
1353 "/M {X2 moveto} bd\n"
1354 "/L {X2 lineto} bd\n"
1355 "/m {moveto} bd\n"
1356 "/l {lineto} bd\n"
1357 "/S {stroke} bd\n"
1358 "/CP {closepath} bd\n"
1359 "/WS {setlinewidth stroke} bd\n"
1360 "/F {fill} bd\n"
1361 "/TaL { } bd\n"
1362 "/TaC {dup stringwidth pop neg 2 div 0 rmoveto } bd\n"
1363 "/TaR {dup stringwidth pop neg 0 rmoveto } bd\n"
1364 "/TL {moveto TaL show} bd\n"
1365 "/TC {moveto TaC show} bd\n"
1366 "/TR {moveto TaR show} bd\n"
1367 "/Rgb { 255.0 div 3 1 roll\n"
1368 " 255.0 div 3 1 roll \n"
1369 " 255.0 div 3 1 roll setrgbcolor } bd\n"
1370 "", state->fp);
1371 eps_define_fonts(state);
1372 return 0;
1373 }
1375 static void eps_clear_dash(eps_state *state)
1376 {
1377 if (!state->has_dash)
1378 return;
1379 state->has_dash = 0;
1380 fputs("[1 0] 0 setdash\n", state->fp);
1381 }
1383 static void eps_write_linearea(eps_state *state, gfx_node_t *node)
1384 {
1385 int i;
1386 FILE *fp = state->fp;
1387 int useOffset = 0;
1388 int clearDashIfAny = 1;
1389 eps_set_color(state, node->color);
1390 if (node->type == GFX_LINE) {
1391 svg_dash dash_info;
1392 if (state->linecap != 1) {
1393 fputs("1 setlinecap\n", fp);
1394 state->linecap = 1;
1395 }
1396 if (state->linejoin != 1) {
1397 fputs("1 setlinejoin\n", fp);
1398 state->linejoin = 1;
1399 }
1400 svg_get_dash(node, &dash_info);
1401 if (dash_info.dash_enable) {
1402 clearDashIfAny = 0;
1403 state->has_dash = 1;
1404 fputs("[", fp);
1405 svg_write_number(fp, dash_info.adjusted_on);
1406 fputs(" ", fp);
1407 svg_write_number(fp, dash_info.adjusted_off);
1408 fputs("] ", fp);
1409 svg_write_number(fp, dash_info.dash_offset);
1410 fputs(" setdash\n", fp);
1411 }
1412 }
1413 if (clearDashIfAny)
1414 eps_clear_dash(state);
1415 for (i = 0; i < node->points; i++) {
1416 ArtVpath *vec = node->path + i;
1417 double x = vec->x;
1418 double y = state->page_height - vec->y;
1419 if (vec->code == ART_MOVETO_OPEN || vec->code == ART_MOVETO)
1420 useOffset = (fabs(x - floor(x) - 0.5) < 0.01 && fabs(y - floor(y) - 0.5) < 0.01);
1421 if (useOffset) {
1422 x -= LINEOFFSET;
1423 y -= LINEOFFSET;
1424 }
1425 switch (vec->code) {
1426 case ART_MOVETO_OPEN: /* fall-through */
1427 case ART_MOVETO:
1428 svg_write_number(fp, x);
1429 fputc(' ', fp);
1430 svg_write_number(fp, y);
1431 fputc(' ', fp);
1432 fputs(useOffset ? "M\n" : "m\n", fp);
1433 break;
1434 case ART_LINETO:
1435 svg_write_number(fp, x);
1436 fputc(' ', fp);
1437 svg_write_number(fp, y);
1438 fputc(' ', fp);
1439 fputs(useOffset ? "L\n" : "l\n", fp);
1440 break;
1441 case ART_CURVETO: break; /* unsupported */
1442 case ART_END: break; /* nop */
1443 }
1444 }
1445 if (node->type == GFX_LINE) {
1446 if (node->closed_path)
1447 fputs("CP ", fp);
1448 if (node->size != state->line_width) {
1449 state->line_width = node->size;
1450 svg_write_number(fp, state->line_width);
1451 fputs(" WS\n", fp);
1452 } else {
1453 fputs("S\n", fp);
1454 }
1455 } else {
1456 fputs("F\n", fp);
1457 }
1458 }
1460 static void eps_write_text(eps_state *state, gfx_node_t *node)
1461 {
1462 FILE *fp = state->fp;
1463 const unsigned char *p;
1464 const char *ps_font = afm_get_font_postscript_name(node->filename);
1465 char align = 'L';
1466 double x = node->x;
1467 double y = state->page_height - node->y, ydelta = 0;
1468 int lineLen = 0;
1469 eps_set_color(state, node->color);
1470 if (strcmp(ps_font, state->font) || node->size != state->font_size) {
1471 state->font = ps_font;
1472 state->font_size = node->size;
1473 svg_write_number(fp, state->font_size);
1474 fprintf(fp, " SetFont-%s\n", state->font);
1475 }
1476 fputs("(", fp);
1477 lineLen = 20;
1478 for (p = (const unsigned char*)node->text; *p; p++) {
1479 if (lineLen > 70) {
1480 fputs("\\\n", fp); /* backslash and \n */
1481 lineLen = 0;
1482 }
1483 switch (*p) {
1484 case '(':
1485 case ')':
1486 case '\\':
1487 case '\n':
1488 case '\r':
1489 case '\t':
1490 fputc('\\', fp);
1491 lineLen++;
1492 /* fall-through */
1493 default:
1494 if (*p >= 126)
1495 fprintf(fp, "\\%03o", *p);
1496 else
1497 fputc(*p, fp);
1498 lineLen++;
1499 }
1500 }
1501 fputs(") ", fp);
1502 switch(node->valign){
1503 case GFX_V_TOP: ydelta = -node->size; break;
1504 case GFX_V_CENTER: ydelta = -node->size / 3.0; break;
1505 case GFX_V_BOTTOM: break;
1506 case GFX_V_NULL: break;
1507 }
1508 if (node->angle == 0)
1509 y += ydelta;
1510 switch (node->halign) {
1511 case GFX_H_RIGHT: align = 'R'; break;
1512 case GFX_H_CENTER: align = 'C'; break;
1513 case GFX_H_LEFT: align= 'L'; break;
1514 case GFX_H_NULL: align= 'L'; break;
1515 }
1516 if (node->angle != 0) {
1517 fputs("\n", fp);
1518 fputs(" gsave ", fp);
1519 svg_write_number(fp, x);
1520 fputc(' ', fp);
1521 svg_write_number(fp, y);
1522 fputs(" translate ", fp);
1523 svg_write_number(fp, -node->angle);
1524 fputs(" rotate 0 ", fp);
1525 svg_write_number(fp, ydelta);
1526 fputs(" moveto ", fp);
1527 fprintf(fp, "Ta%c", align);
1528 fputs(" show grestore\n", fp);
1529 } else {
1530 svg_write_number(fp, x);
1531 fputc(' ', fp);
1532 svg_write_number(fp, y);
1533 fputs(" T", fp);
1534 fputc(align, fp);
1535 fputc('\n', fp);
1536 }
1537 }
1539 static int eps_write_content(eps_state *state)
1540 {
1541 gfx_node_t *node;
1542 fputs("%\n", state->fp);
1543 for (node = state->canvas->firstnode; node; node = node->next) {
1544 switch (node->type) {
1545 case GFX_LINE:
1546 case GFX_AREA:
1547 eps_write_linearea(state, node);
1548 break;
1549 case GFX_TEXT:
1550 eps_write_text(state, node);
1551 break;
1552 }
1553 }
1554 return 0;
1555 }
1557 int gfx_render_eps (gfx_canvas_t *canvas,
1558 art_u32 width, art_u32 height,
1559 gfx_color_t background, FILE *fp){
1560 struct eps_state state;
1561 state.fp = fp;
1562 state.canvas = canvas;
1563 state.page_width = width;
1564 state.page_height = height;
1565 state.font = "no-default-font";
1566 state.font_size = -1;
1567 state.color = 0; /* black */
1568 state.font_list = NULL;
1569 state.linecap = -1;
1570 state.linejoin = -1;
1571 state.has_dash = 0;
1572 if (eps_prologue(&state) == -1)
1573 return -1;
1574 eps_set_color(&state, background);
1575 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1576 height, width, height, width);
1577 if (eps_write_content(&state) == -1)
1578 return 0;
1579 fputs("showpage\n", fp);
1580 fputs("%%EOF\n", fp);
1581 while (state.font_list) {
1582 eps_font *next = state.font_list->next;
1583 free(state.font_list);
1584 state.font_list = next;
1585 }
1586 return 0;
1587 }
1589 /* ------- PDF -------
1590 PDF references page:
1591 http://partners.adobe.com/asn/developer/technotes/acrobatpdf.html
1592 */
1594 typedef struct pdf_buffer
1595 {
1596 int id, is_obj, is_dict, is_stream, pdf_file_pos;
1597 char *data;
1598 int alloc_size, current_size;
1599 struct pdf_buffer *previous_buffer, *next_buffer;
1600 struct pdf_state *state;
1601 } pdf_buffer;
1603 typedef struct pdf_font
1604 {
1605 const char *ps_font;
1606 pdf_buffer obj;
1607 struct pdf_font *next;
1608 } pdf_font;
1610 typedef struct pdf_state
1611 {
1612 FILE *fp;
1613 gfx_canvas_t *canvas;
1614 art_u32 page_width, page_height;
1615 pdf_font *font_list;
1616 pdf_buffer *first_buffer, *last_buffer;
1617 int pdf_file_pos;
1618 int has_failed;
1619 /*--*/
1620 gfx_color_t stroke_color, fill_color;
1621 int font_id;
1622 double font_size;
1623 double line_width;
1624 svg_dash dash;
1625 int linecap, linejoin;
1626 int last_obj_id;
1627 /*--*/
1628 pdf_buffer pdf_header;
1629 pdf_buffer catalog_obj, pages_obj, page1_obj;
1630 pdf_buffer fontsdict_obj;
1631 pdf_buffer graph_stream;
1632 } pdf_state;
1634 static void pdf_init_buffer(pdf_state *state, pdf_buffer *buf)
1635 {
1636 int initial_size = 32;
1637 buf->state = state;
1638 buf->id = -42;
1639 buf->alloc_size = 0;
1640 buf->current_size = 0;
1641 buf->data = (char*)malloc(initial_size);
1642 buf->is_obj = 0;
1643 buf->previous_buffer = NULL;
1644 buf->next_buffer = NULL;
1645 if (buf->data == NULL) {
1646 rrd_set_error("malloc for pdf_buffer data");
1647 state->has_failed = 1;
1648 return;
1649 }
1650 buf->alloc_size = initial_size;
1651 if (state->last_buffer)
1652 state->last_buffer->next_buffer = buf;
1653 if (state->first_buffer == NULL)
1654 state->first_buffer = buf;
1655 buf->previous_buffer = state->last_buffer;
1656 state->last_buffer = buf;
1657 }
1659 static void pdf_put(pdf_buffer *buf, const char *text, int len)
1660 {
1661 if (len <= 0)
1662 return;
1663 if (buf->alloc_size < buf->current_size + len) {
1664 int new_size = buf->alloc_size;
1665 char *new_buf;
1666 while (new_size < buf->current_size + len)
1667 new_size *= 4;
1668 new_buf = (char*)malloc(new_size);
1669 if (new_buf == NULL) {
1670 rrd_set_error("re-malloc for pdf_buffer data");
1671 buf->state->has_failed = 1;
1672 return;
1673 }
1674 memcpy(new_buf, buf->data, buf->current_size);
1675 free(buf->data);
1676 buf->data = new_buf;
1677 buf->alloc_size = new_size;
1678 }
1679 memcpy(buf->data + buf->current_size, text, len);
1680 buf->current_size += len;
1681 }
1683 static void pdf_puts(pdf_buffer *buf, const char *text)
1684 {
1685 pdf_put(buf, text, strlen(text));
1686 }
1688 static void pdf_indent(pdf_buffer *buf)
1689 {
1690 pdf_puts(buf, "\t");
1691 }
1693 static void pdf_putsi(pdf_buffer *buf, const char *text)
1694 {
1695 pdf_indent(buf);
1696 pdf_puts(buf, text);
1697 }
1699 static void pdf_putint(pdf_buffer *buf, int i)
1700 {
1701 char tmp[20];
1702 sprintf(tmp, "%d", i);
1703 pdf_puts(buf, tmp);
1704 }
1706 static void pdf_putnumber(pdf_buffer *buf, double d)
1707 {
1708 char tmp[50];
1709 svg_format_number(tmp, sizeof(tmp), d);
1710 pdf_puts(buf, tmp);
1711 }
1713 static void pdf_init_object(pdf_state *state, pdf_buffer *buf)
1714 {
1715 pdf_init_buffer(state, buf);
1716 buf->id = ++state->last_obj_id;
1717 buf->is_obj = 1;
1718 buf->is_stream = 0;
1719 }
1721 static void pdf_init_dict(pdf_state *state, pdf_buffer *buf)
1722 {
1723 pdf_init_object(state, buf);
1724 buf->is_dict = 1;
1725 }
1727 static void pdf_set_color(pdf_buffer *buf, gfx_color_t color,
1728 gfx_color_t *current_color, const char *op)
1729 {
1730 /* gfx_color_t is RRGGBBAA */
1731 if (*current_color == color)
1732 return;
1733 pdf_putnumber(buf, ((color >> 24) & 255) / 255.0);
1734 pdf_puts(buf, " ");
1735 pdf_putnumber(buf, ((color >> 16) & 255) / 255.0);
1736 pdf_puts(buf, " ");
1737 pdf_putnumber(buf, ((color >> 8) & 255) / 255.0);
1738 pdf_puts(buf, " ");
1739 pdf_puts(buf, op);
1740 pdf_puts(buf, "\n");
1741 *current_color = color;
1742 }
1744 static void pdf_set_stroke_color(pdf_buffer *buf, gfx_color_t color)
1745 {
1746 pdf_set_color(buf, color, &buf->state->stroke_color, "RG");
1747 }
1749 static void pdf_set_fill_color(pdf_buffer *buf, gfx_color_t color)
1750 {
1751 pdf_set_color(buf, color, &buf->state->fill_color, "rg");
1752 }
1754 static pdf_font *pdf_find_font(pdf_state *state, gfx_node_t *node)
1755 {
1756 const char *ps_font = afm_get_font_postscript_name(node->filename);
1757 pdf_font *ef;
1758 for (ef = state->font_list; ef; ef = ef->next) {
1759 if (!strcmp(ps_font, ef->ps_font))
1760 return ef;
1761 }
1762 return NULL;
1763 }
1765 static void pdf_add_font(pdf_state *state, gfx_node_t *node)
1766 {
1767 pdf_font *ef = pdf_find_font(state, node);
1768 if (ef)
1769 return;
1770 ef = malloc(sizeof(pdf_font));
1771 if (ef == NULL) {
1772 rrd_set_error("malloc for pdf_font");
1773 state->has_failed = 1;
1774 return;
1775 }
1776 pdf_init_dict(state, &ef->obj);
1777 ef->next = state->font_list;
1778 ef->ps_font = afm_get_font_postscript_name(node->filename);
1779 state->font_list = ef;
1780 /* fonts dict */
1781 pdf_putsi(&state->fontsdict_obj, "/F");
1782 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1783 pdf_puts(&state->fontsdict_obj, " ");
1784 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1785 pdf_puts(&state->fontsdict_obj, " 0 R\n");
1786 /* fonts def */
1787 pdf_putsi(&ef->obj, "/Type /Font\n");
1788 pdf_putsi(&ef->obj, "/Subtype /Type1\n");
1789 pdf_putsi(&ef->obj, "/Name /F");
1790 pdf_putint(&ef->obj, ef->obj.id);
1791 pdf_puts(&ef->obj, "\n");
1792 pdf_putsi(&ef->obj, "/BaseFont /");
1793 pdf_puts(&ef->obj, ef->ps_font);
1794 pdf_puts(&ef->obj, "\n");
1795 pdf_putsi(&ef->obj, "/Encoding /WinAnsiEncoding\n");
1796 /* 'Cp1252' (this is latin 1 extended with 27 characters;
1797 the encoding is also known as 'winansi')
1798 http://www.lowagie.com/iText/tutorial/ch09.html */
1799 }
1801 static void pdf_create_fonts(pdf_state *state)
1802 {
1803 gfx_node_t *node;
1804 for (node = state->canvas->firstnode; node; node = node->next) {
1805 if (node->type == GFX_TEXT)
1806 pdf_add_font(state, node);
1807 }
1808 }
1810 static void pdf_write_linearea(pdf_state *state, gfx_node_t *node)
1811 {
1812 int i;
1813 pdf_buffer *s = &state->graph_stream;
1814 if (node->type == GFX_LINE) {
1815 svg_dash dash_info;
1816 svg_get_dash(node, &dash_info);
1817 if (!svg_dash_equal(&dash_info, &state->dash)) {
1818 state->dash = dash_info;
1819 if (dash_info.dash_enable) {
1820 pdf_puts(s, "[");
1821 pdf_putnumber(s, dash_info.adjusted_on);
1822 pdf_puts(s, " ");
1823 pdf_putnumber(s, dash_info.adjusted_off);
1824 pdf_puts(s, "] ");
1825 pdf_putnumber(s, dash_info.dash_offset);
1826 pdf_puts(s, " d\n");
1827 } else {
1828 pdf_puts(s, "[] 0 d\n");
1829 }
1830 }
1831 pdf_set_stroke_color(s, node->color);
1832 if (state->linecap != 1) {
1833 pdf_puts(s, "1 j\n");
1834 state->linecap = 1;
1835 }
1836 if (state->linejoin != 1) {
1837 pdf_puts(s, "1 J\n");
1838 state->linejoin = 1;
1839 }
1840 if (node->size != state->line_width) {
1841 state->line_width = node->size;
1842 pdf_putnumber(s, state->line_width);
1843 pdf_puts(s, " w\n");
1844 }
1845 } else {
1846 pdf_set_fill_color(s, node->color);
1847 }
1848 for (i = 0; i < node->points; i++) {
1849 ArtVpath *vec = node->path + i;
1850 double x = vec->x;
1851 double y = state->page_height - vec->y;
1852 if (node->type == GFX_AREA) {
1853 x += LINEOFFSET; /* adjust for libart handling of areas */
1854 y -= LINEOFFSET;
1855 }
1856 switch (vec->code) {
1857 case ART_MOVETO_OPEN: /* fall-through */
1858 case ART_MOVETO:
1859 pdf_putnumber(s, x);
1860 pdf_puts(s, " ");
1861 pdf_putnumber(s, y);
1862 pdf_puts(s, " m\n");
1863 break;
1864 case ART_LINETO:
1865 pdf_putnumber(s, x);
1866 pdf_puts(s, " ");
1867 pdf_putnumber(s, y);
1868 pdf_puts(s, " l\n");
1869 break;
1870 case ART_CURVETO: break; /* unsupported */
1871 case ART_END: break; /* nop */
1872 }
1873 }
1874 if (node->type == GFX_LINE) {
1875 pdf_puts(s, node->closed_path ? "s\n" : "S\n");
1876 } else {
1877 pdf_puts(s, "f\n");
1878 }
1879 }
1881 static void pdf_write_text(pdf_state *state, gfx_node_t *node,
1882 int last_was_text, int next_is_text)
1883 {
1884 char tmp[30];
1885 pdf_buffer *s = &state->graph_stream;
1886 const unsigned char *p;
1887 pdf_font *font = pdf_find_font(state, node);
1888 double x = node->x;
1889 double y = state->page_height - node->y;
1890 double dx = 0, dy = 0;
1891 double cos_a = 0, sin_a = 0;
1892 if (font == NULL) {
1893 rrd_set_error("font disappeared");
1894 state->has_failed = 1;
1895 return;
1896 }
1897 switch(node->valign){
1898 case GFX_V_TOP: dy = -node->size; break;
1899 case GFX_V_CENTER: dy = -node->size / 3.0; break;
1900 case GFX_V_BOTTOM: break;
1901 case GFX_V_NULL: break;
1902 }
1903 switch (node->halign) {
1904 case GFX_H_RIGHT: dx = -afm_get_text_width(0, font->ps_font,
1905 node->size, node->tabwidth, node->text);
1906 break;
1907 case GFX_H_CENTER: dx = -afm_get_text_width(0, font->ps_font,
1908 node->size, node->tabwidth, node->text) / 2;
1909 break;
1910 case GFX_H_LEFT: break;
1911 case GFX_H_NULL: break;
1912 }
1913 pdf_set_fill_color(s, node->color);
1914 if (node->angle != 0) {
1915 double a = 2 * M_PI * -node->angle / 360.0;
1916 double new_x, new_y;
1917 cos_a = cos(a);
1918 sin_a = sin(a);
1919 new_x = cos_a * dx - sin_a * dy + x;
1920 new_y = sin_a * dx + cos_a * dy + y;
1921 x = new_x;
1922 y = new_y;
1923 } else {
1924 x += dx;
1925 y += dy;
1926 }
1927 if (!last_was_text)
1928 pdf_puts(s, "BT\n");
1929 if (state->font_id != font->obj.id || node->size != state->font_size) {
1930 state->font_id = font->obj.id;
1931 state->font_size = node->size;
1932 pdf_puts(s, "/F");
1933 pdf_putint(s, font->obj.id);
1934 pdf_puts(s, " ");
1935 pdf_putnumber(s, node->size);
1936 pdf_puts(s, " Tf\n");
1937 }
1938 if (node->angle == 0) {
1939 pdf_puts(s, "1 0 0 1 ");
1940 } else {
1941 pdf_putnumber(s, cos_a);
1942 pdf_puts(s, " ");
1943 pdf_putnumber(s, sin_a);
1944 pdf_puts(s, " ");
1945 pdf_putnumber(s, -sin_a);
1946 pdf_puts(s, " ");
1947 pdf_putnumber(s, cos_a);
1948 pdf_puts(s, " ");
1949 }
1950 pdf_putnumber(s, x);
1951 pdf_puts(s, " ");
1952 pdf_putnumber(s, y);
1953 pdf_puts(s, " Tm\n");
1954 pdf_puts(s, "(");
1955 for (p = (const unsigned char*)node->text; *p; p++) {
1956 switch (*p) {
1957 case '(':
1958 case ')':
1959 case '\\':
1960 case '\n':
1961 case '\r':
1962 case '\t':
1963 pdf_puts(s, "\\");
1964 /* fall-through */
1965 default:
1966 if (*p >= 126) {
1967 snprintf(tmp, sizeof(tmp), "\\%03o", *p);
1968 pdf_puts(s, tmp);
1969 } else {
1970 pdf_put(s, (const char*)p, 1);
1971 }
1972 }
1973 }
1974 pdf_puts(s, ") Tj\n");
1975 if (!next_is_text)
1976 pdf_puts(s, "ET\n");
1977 }
1979 static void pdf_write_content(pdf_state *state)
1980 {
1981 gfx_node_t *node;
1982 int last_was_text = 0, next_is_text;
1983 for (node = state->canvas->firstnode; node; node = node->next) {
1984 switch (node->type) {
1985 case GFX_LINE:
1986 case GFX_AREA:
1987 pdf_write_linearea(state, node);
1988 break;
1989 case GFX_TEXT:
1990 next_is_text = node->next && node->next->type == GFX_TEXT;
1991 pdf_write_text(state, node, last_was_text, next_is_text);
1992 break;
1993 }
1994 last_was_text = node->type == GFX_TEXT;
1995 }
1996 }
1998 static void pdf_init_document(pdf_state *state)
1999 {
2000 pdf_init_buffer(state, &state->pdf_header);
2001 pdf_init_dict(state, &state->catalog_obj);
2002 pdf_init_dict(state, &state->pages_obj);
2003 pdf_init_dict(state, &state->page1_obj);
2004 pdf_init_dict(state, &state->fontsdict_obj);
2005 pdf_create_fonts(state);
2006 if (state->has_failed)
2007 return;
2008 /* make stream last object in file */
2009 pdf_init_object(state, &state->graph_stream);
2010 state->graph_stream.is_stream = 1;
2011 }
2013 static void pdf_setup_document(pdf_state *state)
2014 {
2015 /* all objects created by now, so init code can reference them */
2016 /* HEADER */
2017 pdf_puts(&state->pdf_header, "%PDF-1.3\n");
2018 /* following 8 bit comment is recommended by Adobe for
2019 indicating binary file to file transfer applications */
2020 pdf_puts(&state->pdf_header, "%\xE2\xE3\xCF\xD3\n");
2021 /* CATALOG */
2022 pdf_putsi(&state->catalog_obj, "/Type /Catalog\n");
2023 pdf_putsi(&state->catalog_obj, "/Pages ");
2024 pdf_putint(&state->catalog_obj, state->pages_obj.id);
2025 pdf_puts(&state->catalog_obj, " 0 R\n");
2026 /* PAGES */
2027 pdf_putsi(&state->pages_obj, "/Type /Pages\n");
2028 pdf_putsi(&state->pages_obj, "/Kids [");
2029 pdf_putint(&state->pages_obj, state->page1_obj.id);
2030 pdf_puts(&state->pages_obj, " 0 R]\n");
2031 pdf_putsi(&state->pages_obj, "/Count 1\n");
2032 /* PAGE 1 */
2033 pdf_putsi(&state->page1_obj, "/Type /Page\n");
2034 pdf_putsi(&state->page1_obj, "/Parent ");
2035 pdf_putint(&state->page1_obj, state->pages_obj.id);
2036 pdf_puts(&state->page1_obj, " 0 R\n");
2037 pdf_putsi(&state->page1_obj, "/MediaBox [0 0 ");
2038 pdf_putint(&state->page1_obj, state->page_width);
2039 pdf_puts(&state->page1_obj, " ");
2040 pdf_putint(&state->page1_obj, state->page_height);
2041 pdf_puts(&state->page1_obj, "]\n");
2042 pdf_putsi(&state->page1_obj, "/Contents ");
2043 pdf_putint(&state->page1_obj, state->graph_stream.id);
2044 pdf_puts(&state->page1_obj, " 0 R\n");
2045 pdf_putsi(&state->page1_obj, "/Resources << /Font ");
2046 pdf_putint(&state->page1_obj, state->fontsdict_obj.id);
2047 pdf_puts(&state->page1_obj, " 0 R >>\n");
2048 }
2050 static void pdf_write_string_to_file(pdf_state *state, const char *text)
2051 {
2052 fputs(text, state->fp);
2053 state->pdf_file_pos += strlen(text);
2054 }
2056 static void pdf_write_buf_to_file(pdf_state *state, pdf_buffer *buf)
2057 {
2058 char tmp[40];
2059 buf->pdf_file_pos = state->pdf_file_pos;
2060 if (buf->is_obj) {
2061 snprintf(tmp, sizeof(tmp), "%d 0 obj\n", buf->id);
2062 pdf_write_string_to_file(state, tmp);
2063 }
2064 if (buf->is_dict)
2065 pdf_write_string_to_file(state, "<<\n");
2066 if (buf->is_stream) {
2067 snprintf(tmp, sizeof(tmp), "<< /Length %d >>\n", buf->current_size);
2068 pdf_write_string_to_file(state, tmp);
2069 pdf_write_string_to_file(state, "stream\n");
2070 }
2071 fwrite(buf->data, 1, buf->current_size, state->fp);
2072 state->pdf_file_pos += buf->current_size;
2073 if (buf->is_stream)
2074 pdf_write_string_to_file(state, "endstream\n");
2075 if (buf->is_dict)
2076 pdf_write_string_to_file(state, ">>\n");
2077 if (buf->is_obj)
2078 pdf_write_string_to_file(state, "endobj\n");
2079 }
2081 static void pdf_write_to_file(pdf_state *state)
2082 {
2083 pdf_buffer *buf = state->first_buffer;
2084 int xref_pos;
2085 state->pdf_file_pos = 0;
2086 pdf_write_buf_to_file(state, &state->pdf_header);
2087 while (buf) {
2088 if (buf->is_obj)
2089 pdf_write_buf_to_file(state, buf);
2090 buf = buf->next_buffer;
2091 }
2092 xref_pos = state->pdf_file_pos;
2093 fprintf(state->fp, "xref\n");
2094 fprintf(state->fp, "%d %d\n", 0, state->last_obj_id + 1);
2095 /* TOC lines must be exactly 20 bytes including \n */
2096 fprintf(state->fp, "%010d %05d f\x20\n", 0, 65535);
2097 for (buf = state->first_buffer; buf; buf = buf->next_buffer) {
2098 if (buf->is_obj)
2099 fprintf(state->fp, "%010d %05d n\x20\n", buf->pdf_file_pos, 0);
2100 }
2101 fprintf(state->fp, "trailer\n");
2102 fprintf(state->fp, "<<\n");
2103 fprintf(state->fp, "\t/Size %d\n", state->last_obj_id + 1);
2104 fprintf(state->fp, "\t/Root %d 0 R\n", state->catalog_obj.id);
2105 fprintf(state->fp, ">>\n");
2106 fprintf(state->fp, "startxref\n");
2107 fprintf(state->fp, "%d\n", xref_pos);
2108 fputs("%%EOF\n", state->fp);
2109 }
2111 static void pdf_free_resources(pdf_state *state)
2112 {
2113 pdf_buffer *buf = state->first_buffer;
2114 while (buf) {
2115 free(buf->data);
2116 buf->data = NULL;
2117 buf->alloc_size = buf->current_size = 0;
2118 buf = buf->next_buffer;
2119 }
2120 while (state->font_list) {
2121 pdf_font *next = state->font_list->next;
2122 free(state->font_list);
2123 state->font_list = next;
2124 }
2125 }
2127 int gfx_render_pdf (gfx_canvas_t *canvas,
2128 art_u32 width, art_u32 height,
2129 gfx_color_t background, FILE *fp){
2130 struct pdf_state state;
2131 memset(&state, 0, sizeof(pdf_state));
2132 state.fp = fp;
2133 state.canvas = canvas;
2134 state.page_width = width;
2135 state.page_height = height;
2136 state.font_id = -1;
2137 state.font_size = -1;
2138 state.font_list = NULL;
2139 state.linecap = -1;
2140 state.linejoin = -1;
2141 pdf_init_document(&state);
2142 /*
2143 pdf_set_color(&state, background);
2144 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
2145 height, width, height, width);
2146 */
2147 if (!state.has_failed)
2148 pdf_write_content(&state);
2149 if (!state.has_failed)
2150 pdf_setup_document(&state);
2151 if (!state.has_failed)
2152 pdf_write_to_file(&state);
2153 pdf_free_resources(&state);
2154 return state.has_failed ? -1 : 0;
2155 }