bc57a9039a8379a05a8c10bc2a9996bec5f806c0
1 /****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
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
19 #include "rrd_gfx.h"
20 #include "rrd_afm.h"
22 /* lines are better drawn on the pixle than between pixles */
23 #define LINEOFFSET 0.5
25 static
26 gfx_node_t *gfx_new_node( gfx_canvas_t *canvas,enum gfx_en type){
27 gfx_node_t *node = art_new(gfx_node_t,1);
28 if (node == NULL) return NULL;
29 node->type = type;
30 node->color = 0x0; /* color of element 0xRRGGBBAA alpha 0xff is solid*/
31 node->size =0.0; /* font size, line width */
32 node->path = NULL; /* path */
33 node->points = 0;
34 node->points_max =0;
35 node->closed_path = 0;
36 node->svp = NULL; /* svp */
37 node->filename = NULL; /* font or image filename */
38 node->text = NULL;
39 node->x = 0.0;
40 node->y = 0.0; /* position */
41 node->angle = 0;
42 node->halign = GFX_H_NULL; /* text alignement */
43 node->valign = GFX_V_NULL; /* text alignement */
44 node->tabwidth = 0.0;
45 node->next = NULL;
46 if (canvas->lastnode != NULL){
47 canvas->lastnode->next = node;
48 }
49 if (canvas->firstnode == NULL){
50 canvas->firstnode = node;
51 }
52 canvas->lastnode = node;
53 return node;
54 }
56 gfx_canvas_t *gfx_new_canvas (void) {
57 gfx_canvas_t *canvas = art_new(gfx_canvas_t,1);
58 canvas->firstnode = NULL;
59 canvas->lastnode = NULL;
60 canvas->imgformat = IF_PNG; /* we default to PNG output */
61 canvas->interlaced = 0;
62 canvas->zoom = 1.0;
63 return canvas;
64 }
66 /* create a new line */
67 gfx_node_t *gfx_new_line(gfx_canvas_t *canvas,
68 double X0, double Y0,
69 double X1, double Y1,
70 double width, gfx_color_t color){
71 return gfx_new_dashed_line(canvas, X0, Y0, X1, Y1, width, color, 0, 0);
72 }
74 gfx_node_t *gfx_new_dashed_line(gfx_canvas_t *canvas,
75 double X0, double Y0,
76 double X1, double Y1,
77 double width, gfx_color_t color,
78 double dash_on, double dash_off){
80 gfx_node_t *node;
81 ArtVpath *vec;
82 node = gfx_new_node(canvas,GFX_LINE);
83 if (node == NULL) return NULL;
84 vec = art_new(ArtVpath, 3);
85 if (vec == NULL) return NULL;
86 vec[0].code = ART_MOVETO_OPEN; vec[0].x=X0+LINEOFFSET; vec[0].y=Y0+LINEOFFSET;
87 vec[1].code = ART_LINETO; vec[1].x=X1+LINEOFFSET; vec[1].y=Y1+LINEOFFSET;
88 vec[2].code = ART_END;
90 node->points = 3;
91 node->points_max = 3;
92 node->color = color;
93 node->size = width;
94 node->dash_on = dash_on;
95 node->dash_off = dash_off;
96 node->path = vec;
97 return node;
98 }
100 /* create a new area */
101 gfx_node_t *gfx_new_area (gfx_canvas_t *canvas,
102 double X0, double Y0,
103 double X1, double Y1,
104 double X2, double Y2,
105 gfx_color_t color) {
107 gfx_node_t *node;
108 ArtVpath *vec;
109 node = gfx_new_node(canvas,GFX_AREA);
110 if (node == NULL) return NULL;
111 vec = art_new(ArtVpath, 5);
112 if (vec == NULL) return NULL;
113 vec[0].code = ART_MOVETO; vec[0].x=X0; vec[0].y=Y0;
114 vec[1].code = ART_LINETO; vec[1].x=X1; vec[1].y=Y1;
115 vec[2].code = ART_LINETO; vec[2].x=X2; vec[2].y=Y2;
116 vec[3].code = ART_LINETO; vec[3].x=X0; vec[3].y=Y0;
117 vec[4].code = ART_END;
119 node->points = 5;
120 node->points_max = 5;
121 node->color = color;
122 node->path = vec;
124 return node;
125 }
127 /* add a point to a line or to an area */
128 int gfx_add_point (gfx_node_t *node,
129 double x, double y){
130 if (node == NULL) return 1;
131 if (node->type == GFX_AREA) {
132 double X0 = node->path[0].x;
133 double Y0 = node->path[0].y;
134 node->points -= 2;
135 art_vpath_add_point (&(node->path),
136 &(node->points),
137 &(node->points_max),
138 ART_LINETO,
139 x,y);
140 art_vpath_add_point (&(node->path),
141 &(node->points),
142 &(node->points_max),
143 ART_LINETO,
144 X0,Y0);
145 art_vpath_add_point (&(node->path),
146 &(node->points),
147 &(node->points_max),
148 ART_END,
149 0,0);
150 } else if (node->type == GFX_LINE) {
151 node->points -= 1;
152 art_vpath_add_point (&(node->path),
153 &(node->points),
154 &(node->points_max),
155 ART_LINETO,
156 x+LINEOFFSET,y+LINEOFFSET);
157 art_vpath_add_point (&(node->path),
158 &(node->points),
159 &(node->points_max),
160 ART_END,
161 0,0);
163 } else {
164 /* can only add point to areas and lines */
165 return 1;
166 }
167 return 0;
168 }
170 void gfx_close_path (gfx_node_t *node) {
171 node->closed_path = 1;
172 if (node->path[0].code == ART_MOVETO_OPEN)
173 node->path[0].code = ART_MOVETO;
174 }
176 /* create a text node */
177 gfx_node_t *gfx_new_text (gfx_canvas_t *canvas,
178 double x, double y, gfx_color_t color,
179 char* font, double size,
180 double tabwidth, double angle,
181 enum gfx_h_align_en h_align,
182 enum gfx_v_align_en v_align,
183 char* text){
184 gfx_node_t *node = gfx_new_node(canvas,GFX_TEXT);
185 if (angle != 0.0){
186 /* currently we only support 0 and 270 */
187 angle = 270.0;
188 }
190 node->text = strdup(text);
191 node->size = size;
192 node->filename = strdup(font);
193 node->x = x;
194 node->y = y;
195 node->angle = angle;
196 node->color = color;
197 node->tabwidth = tabwidth;
198 node->halign = h_align;
199 node->valign = v_align;
200 #if 0
201 /* debugging: show text anchor
202 green is along x-axis, red is downward y-axis */
203 if (1) {
204 double a = 2 * M_PI * -node->angle / 360.0;
205 double cos_a = cos(a);
206 double sin_a = sin(a);
207 double len = 3;
208 gfx_new_line(canvas,
209 x, y,
210 x + len * cos_a, y - len * sin_a,
211 0.2, 0x00FF0000);
212 gfx_new_line(canvas,
213 x, y,
214 x + len * sin_a, y + len * cos_a,
215 0.2, 0xFF000000);
216 }
217 #endif
218 return node;
219 }
221 int gfx_render(gfx_canvas_t *canvas,
222 art_u32 width, art_u32 height,
223 gfx_color_t background, FILE *fp){
224 switch (canvas->imgformat) {
225 case IF_PNG:
226 return gfx_render_png (canvas, width, height, background, fp);
227 case IF_SVG:
228 return gfx_render_svg (canvas, width, height, background, fp);
229 case IF_EPS:
230 return gfx_render_eps (canvas, width, height, background, fp);
231 case IF_PDF:
232 return gfx_render_pdf (canvas, width, height, background, fp);
233 default:
234 return -1;
235 }
236 }
238 double gfx_get_text_width ( gfx_canvas_t *canvas,
239 double start, char* font, double size,
240 double tabwidth, char* text){
241 switch (canvas->imgformat) {
242 case IF_PNG:
243 return gfx_get_text_width_libart (canvas, start, font, size, tabwidth, text);
244 case IF_SVG: /* fall through */
245 case IF_EPS:
246 case IF_PDF:
247 return afm_get_text_width(start, font, size, tabwidth, text);
248 default:
249 return size * strlen(text);
250 }
251 }
253 double gfx_get_text_width_libart ( gfx_canvas_t *canvas,
254 double start, char* font, double size,
255 double tabwidth, char* text){
257 FT_GlyphSlot slot;
258 FT_UInt previous=0;
259 FT_UInt glyph_index=0;
260 FT_Bool use_kerning;
261 int error;
262 FT_Face face;
263 FT_Library library=NULL;
264 double text_width=0;
265 FT_Init_FreeType( &library );
266 error = FT_New_Face( library, font, 0, &face );
267 if ( error ) return -1;
268 error = FT_Set_Char_Size(face, size*64,size*64, 100,100);
269 if ( error ) return -1;
271 use_kerning = FT_HAS_KERNING(face);
272 slot = face->glyph;
273 for(;*text;text++) {
274 previous = glyph_index;
275 glyph_index = FT_Get_Char_Index( face, *text);
277 if (use_kerning && previous && glyph_index){
278 FT_Vector delta;
279 FT_Get_Kerning( face, previous, glyph_index,
280 0, &delta );
281 text_width += (double)delta.x / 64.0;
283 }
284 error = FT_Load_Glyph( face, glyph_index, 0 );
285 if ( error ) {
286 FT_Done_FreeType(library);
287 return -1;
288 }
289 if (! previous) {
290 text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
291 }
292 text_width += (double)slot->metrics.horiAdvance / 64.0;
293 }
294 text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */
295 text_width += (double)slot->metrics.width / 64.0; /* add just char width */
296 text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
297 FT_Done_FreeType(library);
298 return text_width;
299 }
301 static void gfx_libart_close_path(gfx_canvas_t *canvas,
302 gfx_node_t *node, ArtVpath **vec)
303 {
304 /* libart must have end==start for closed paths,
305 even if using ART_MOVETO and not ART_MOVETO_OPEN
306 so add extra point which is the same as the starting point */
307 int points_max = node->points; /* scaled array has exact size */
308 int points = node->points - 1;
309 art_vpath_add_point (vec, &points, &points_max, ART_LINETO,
310 (**vec).x, (**vec).y);
311 art_vpath_add_point (vec, &points, &points_max, ART_END, 0, 0);
312 }
314 static void gfx_round_scaled_coordinates(gfx_canvas_t *canvas,
315 gfx_node_t *node, ArtVpath *vec)
316 {
317 while (vec->code != ART_END) {
318 vec->x = floor(vec->x - LINEOFFSET + 0.5) + LINEOFFSET;
319 vec->y = floor(vec->y - LINEOFFSET + 0.5) + LINEOFFSET;
320 vec++;
321 }
322 }
324 static int gfx_save_png (art_u8 *buffer, FILE *fp,
325 long width, long height, long bytes_per_pixel);
326 /* render grafics into png image */
327 int gfx_render_png (gfx_canvas_t *canvas,
328 art_u32 width, art_u32 height,
329 gfx_color_t background, FILE *fp){
332 FT_Library library;
333 gfx_node_t *node = canvas->firstnode;
334 art_u8 red = background >> 24, green = (background >> 16) & 0xff;
335 art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
336 unsigned long pys_width = width * canvas->zoom;
337 unsigned long pys_height = height * canvas->zoom;
338 const int bytes_per_pixel = 3;
339 unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
340 art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
341 art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height);
342 FT_Init_FreeType( &library );
343 while(node){
344 switch (node->type) {
345 case GFX_LINE:
346 case GFX_AREA: {
347 ArtVpath *vec;
348 double dst[6];
349 ArtSVP *svp;
350 art_affine_scale(dst,canvas->zoom,canvas->zoom);
351 vec = art_vpath_affine_transform(node->path,dst);
352 if (node->closed_path)
353 gfx_libart_close_path(canvas, node, &vec);
354 gfx_round_scaled_coordinates(canvas, node, vec);
355 if(node->type == GFX_LINE){
356 svp = art_svp_vpath_stroke ( vec, ART_PATH_STROKE_JOIN_ROUND,
357 ART_PATH_STROKE_CAP_ROUND,
358 node->size*canvas->zoom,1,1);
359 } else {
360 svp = art_svp_from_vpath ( vec );
361 }
362 art_free(vec);
363 art_rgb_svp_alpha (svp ,0,0, pys_width, pys_height,
364 node->color, buffer, rowstride, NULL);
365 art_free(svp);
366 break;
367 }
368 case GFX_TEXT: {
369 int error;
370 float text_width=0.0, text_height = 0.0;
371 unsigned char *text;
372 art_u8 fcolor[3],falpha;
373 FT_Face face;
374 FT_GlyphSlot slot;
375 FT_UInt previous=0;
376 FT_UInt glyph_index=0;
377 FT_Bool use_kerning;
379 float pen_x = 0.0 , pen_y = 0.0;
380 /* double x,y; */
381 long ix,iy,iz;
383 fcolor[0] = node->color >> 24;
384 fcolor[1] = (node->color >> 16) & 0xff;
385 fcolor[2] = (node->color >> 8) & 0xff;
386 falpha = node->color & 0xff;
387 error = FT_New_Face( library,
388 (char *)node->filename,
389 0,
390 &face );
391 if ( error ) break;
392 use_kerning = FT_HAS_KERNING(face);
394 error = FT_Set_Char_Size(face, /* handle to face object */
395 (long)(node->size*64),
396 (long)(node->size*64),
397 (long)(100*canvas->zoom),
398 (long)(100*canvas->zoom));
399 if ( error ) break;
400 pen_x = node->x * canvas->zoom;
401 pen_y = node->y * canvas->zoom;
402 slot = face->glyph;
404 for(text=(unsigned char *)node->text;*text;text++) {
405 previous = glyph_index;
406 glyph_index = FT_Get_Char_Index( face, *text);
408 if (use_kerning && previous && glyph_index){
409 FT_Vector delta;
410 FT_Get_Kerning( face, previous, glyph_index,
411 0, &delta );
412 text_width += (double)delta.x / 64.0;
414 }
415 error = FT_Load_Glyph( face, glyph_index, 0 );
416 if ( error ) break;
417 if (previous == 0){
418 pen_x -= (double)slot->metrics.horiBearingX / 64.0; /* adjust pos for first char */
419 text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
420 }
421 if ( text_height < (double)slot->metrics.horiBearingY / 64.0 ) {
422 text_height = (double)slot->metrics.horiBearingY / 64.0;
423 }
424 text_width += (double)slot->metrics.horiAdvance / 64.0;
425 }
426 text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */
427 text_width += (double)slot->metrics.width / 64.0; /* add just char width */
428 text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
430 switch(node->halign){
431 case GFX_H_RIGHT: pen_x -= text_width; break;
432 case GFX_H_CENTER: pen_x -= text_width / 2.0; break;
433 case GFX_H_LEFT: break;
434 case GFX_H_NULL: break;
435 }
437 switch(node->valign){
438 case GFX_V_TOP: pen_y += text_height; break;
439 case GFX_V_CENTER: pen_y += text_height / 2.0; break;
440 case GFX_V_BOTTOM: break;
441 case GFX_V_NULL: break;
442 }
444 glyph_index=0;
445 for(text=(unsigned char *)node->text;*text;text++) {
446 int gr;
447 previous = glyph_index;
448 glyph_index = FT_Get_Char_Index( face, *text);
450 if (use_kerning && previous && glyph_index){
451 FT_Vector delta;
452 FT_Get_Kerning( face, previous, glyph_index,
453 0, &delta );
454 pen_x += (double)delta.x / 64.0;
456 }
457 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_RENDER );
458 if ( error ) break;
459 gr = slot->bitmap.num_grays -1;
460 for (iy=0; iy < slot->bitmap.rows; iy++){
461 long buf_y = iy+(pen_y+0.5)-slot->bitmap_top;
462 if (buf_y < 0 || buf_y >= pys_height) continue;
463 buf_y *= rowstride;
464 for (ix=0;ix < slot->bitmap.width;ix++){
465 long buf_x = ix + (pen_x + 0.5) + (double)slot->bitmap_left ;
466 art_u8 font_alpha;
468 if (buf_x < 0 || buf_x >= pys_width) continue;
469 buf_x *= bytes_per_pixel ;
470 font_alpha = *(slot->bitmap.buffer + iy * slot->bitmap.width + ix);
471 font_alpha = (art_u8)((double)font_alpha / gr * falpha);
472 for (iz = 0; iz < 3; iz++){
473 art_u8 *orig = buffer + buf_y + buf_x + iz;
474 *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) +
475 (double)fcolor[iz] / gr * (font_alpha));
476 }
477 }
478 }
479 pen_x += (double)slot->metrics.horiAdvance / 64.0;
480 }
481 }
482 }
483 node = node->next;
484 }
485 gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
486 art_free(buffer);
487 FT_Done_FreeType( library );
488 return 0;
489 }
491 /* free memory used by nodes this will also remove memory required for
492 associated paths and svcs ... but not for text strings */
493 int
494 gfx_destroy (gfx_canvas_t *canvas){
495 gfx_node_t *next,*node = canvas->firstnode;
496 while(node){
497 next = node->next;
498 art_free(node->path);
499 art_free(node->svp);
500 free(node->text);
501 free(node->filename);
502 art_free(node);
503 node = next;
504 }
505 return 0;
506 }
508 static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){
509 png_structp png_ptr = NULL;
510 png_infop info_ptr = NULL;
511 int i;
512 png_bytep *row_pointers;
513 int rowstride = width * bytes_per_pixel;
514 png_text text[2];
516 if (fp == NULL)
517 return (1);
519 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
520 if (png_ptr == NULL)
521 {
522 return (1);
523 }
524 row_pointers = (png_bytepp)png_malloc(png_ptr,
525 height*sizeof(png_bytep));
527 info_ptr = png_create_info_struct(png_ptr);
529 if (info_ptr == NULL)
530 {
531 png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
532 return (1);
533 }
535 if (setjmp(png_jmpbuf(png_ptr)))
536 {
537 /* If we get here, we had a problem writing the file */
538 png_destroy_write_struct(&png_ptr, &info_ptr);
539 return (1);
540 }
542 png_init_io(png_ptr, fp);
543 png_set_IHDR (png_ptr, info_ptr,width, height,
544 8, PNG_COLOR_TYPE_RGB,
545 PNG_INTERLACE_NONE,
546 PNG_COMPRESSION_TYPE_DEFAULT,
547 PNG_FILTER_TYPE_DEFAULT);
549 text[0].key = "Software";
550 text[0].text = "RRDtool, Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch";
551 text[0].compression = PNG_TEXT_COMPRESSION_NONE;
552 png_set_text (png_ptr, info_ptr, text, 1);
554 /* Write header data */
555 png_write_info (png_ptr, info_ptr);
557 for (i = 0; i < height; i++)
558 row_pointers[i] = (png_bytep) (buffer + i*rowstride);
560 png_write_image(png_ptr, row_pointers);
561 png_write_end(png_ptr, info_ptr);
562 png_destroy_write_struct(&png_ptr, &info_ptr);
563 return 1;
564 }
567 /* ------- SVG -------
568 SVG reference:
569 http://www.w3.org/TR/SVG/
570 */
571 static int svg_indent = 0;
572 static int svg_single_line = 0;
573 static const char *svg_default_font = "Helvetica";
574 typedef struct svg_dash
575 {
576 int dash_enable;
577 double dash_adjust, dash_len, dash_offset;
578 double adjusted_on, adjusted_off;
579 } svg_dash;
582 static void svg_print_indent(FILE *fp)
583 {
584 int i;
585 for (i = svg_indent - svg_single_line; i > 0; i--) {
586 putc(' ', fp);
587 putc(' ', fp);
588 }
589 }
591 static void svg_start_tag(FILE *fp, const char *name)
592 {
593 svg_print_indent(fp);
594 putc('<', fp);
595 fputs(name, fp);
596 svg_indent++;
597 }
599 static void svg_close_tag_single_line(FILE *fp)
600 {
601 svg_single_line++;
602 putc('>', fp);
603 }
605 static void svg_close_tag(FILE *fp)
606 {
607 putc('>', fp);
608 if (!svg_single_line)
609 putc('\n', fp);
610 }
612 static void svg_end_tag(FILE *fp, const char *name)
613 {
614 /* name is NULL if closing empty-node tag */
615 svg_indent--;
616 if (svg_single_line)
617 svg_single_line--;
618 else if (name)
619 svg_print_indent(fp);
620 if (name != NULL) {
621 fputs("</", fp);
622 fputs(name, fp);
623 } else {
624 putc('/', fp);
625 }
626 svg_close_tag(fp);
627 }
629 static void svg_close_tag_empty_node(FILE *fp)
630 {
631 svg_end_tag(fp, NULL);
632 }
634 static void svg_write_text(FILE *fp, const char *text)
635 {
636 const unsigned char *p, *start, *last;
637 unsigned int ch;
638 p = (const unsigned char*)text;
639 if (!p)
640 return;
641 /* trim leading spaces */
642 while (*p == ' ')
643 p++;
644 start = p;
645 /* trim trailing spaces */
646 last = p - 1;
647 while ((ch = *p) != 0) {
648 if (ch != ' ')
649 last = p;
650 p++;
651 }
652 /* encode trimmed text */
653 p = start;
654 while (p <= last) {
655 ch = *p++;
656 ch = afm_host2unicode(ch); /* unsafe macro */
657 switch (ch) {
658 case '&': fputs("&", fp); break;
659 case '<': fputs("<", fp); break;
660 case '>': fputs(">", fp); break;
661 case '"': fputs(""", fp); break;
662 default:
663 if (ch >= 127)
664 fprintf(fp, "&#%d;", ch);
665 else
666 putc(ch, fp);
667 }
668 }
669 }
671 static void svg_format_number(char *buf, int bufsize, double d)
672 {
673 /* omit decimals if integer to reduce filesize */
674 char *p;
675 snprintf(buf, bufsize, "%.2f", d);
676 p = buf; /* doesn't trust snprintf return value */
677 while (*p)
678 p++;
679 while (--p > buf) {
680 char ch = *p;
681 if (ch == '0') {
682 *p = '\0'; /* zap trailing zeros */
683 continue;
684 }
685 if (ch == '.')
686 *p = '\0'; /* zap trailing dot */
687 break;
688 }
689 }
691 static void svg_write_number(FILE *fp, double d)
692 {
693 char buf[60];
694 svg_format_number(buf, sizeof(buf), d);
695 fputs(buf, fp);
696 }
698 static int svg_color_is_black(int c)
699 {
700 /* gfx_color_t is RRGGBBAA */
701 return c == 0x000000FF;
702 }
704 static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
705 {
706 /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
707 gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
708 gfx_color_t opacity = c & 0xFF;
709 fprintf(fp, " %s=\"", attr);
710 if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
711 /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
712 fprintf(fp, "#%03lX",
713 ( ((rrggbb >> 8) & 0xF00)
714 | ((rrggbb >> 4) & 0x0F0)
715 | ( rrggbb & 0x00F)));
716 } else {
717 fprintf(fp, "#%06lX", rrggbb);
718 }
719 fputs("\"", fp);
720 if (opacity != 0xFF) {
721 fprintf(fp, " stroke-opacity=\"");
722 svg_write_number(fp, opacity / 255.0);
723 fputs("\"", fp);
724 }
725 }
727 static void svg_get_dash(gfx_node_t *node, svg_dash *d)
728 {
729 double offset;
730 int mult;
731 if (node->dash_on <= 0 || node->dash_off <= 0) {
732 d->dash_enable = 0;
733 return;
734 }
735 d->dash_enable = 1;
736 d->dash_len = node->dash_on + node->dash_off;
737 /* dash on/off adjustment due to round caps */
738 d->dash_adjust = 0.8 * node->size;
739 d->adjusted_on = node->dash_on - d->dash_adjust;
740 if (d->adjusted_on < 0.01)
741 d->adjusted_on = 0.01;
742 d->adjusted_off = d->dash_len - d->adjusted_on;
743 /* dash offset calc */
744 if (node->path[0].x == node->path[1].x) /* only good for horz/vert lines */
745 offset = node->path[0].y;
746 else
747 offset = node->path[0].x;
748 mult = (int)fabs(offset / d->dash_len);
749 d->dash_offset = offset - mult * d->dash_len;
750 if (node->path[0].x < node->path[1].x || node->path[0].y < node->path[1].y)
751 d->dash_offset = d->dash_len - d->dash_offset;
752 }
754 static int svg_dash_equal(svg_dash *a, svg_dash *b)
755 {
756 if (a->dash_enable != b->dash_enable)
757 return 0;
758 if (a->adjusted_on != b->adjusted_on)
759 return 0;
760 if (a->adjusted_off != b->adjusted_off)
761 return 0;
762 /* rest of properties will be the same when on+off are */
763 return 1;
764 }
766 static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
767 {
768 svg_dash dash_info;
769 svg_get_dash(node, &dash_info);
770 fputs(" stroke-width=\"", fp);
771 svg_write_number(fp, node->size);
772 fputs("\"", fp);
773 svg_write_color(fp, node->color, "stroke");
774 fputs(" fill=\"none\"", fp);
775 if (dash_info.dash_enable) {
776 if (dash_info.dash_offset != 0) {
777 fputs(" stroke-dashoffset=\"", fp);
778 svg_write_number(fp, dash_info.dash_offset);
779 fputs("\"", fp);
780 }
781 fputs(" stroke-dasharray=\"", fp);
782 svg_write_number(fp, dash_info.adjusted_on);
783 fputs(",", fp);
784 svg_write_number(fp, dash_info.adjusted_off);
785 fputs("\"", fp);
786 }
787 }
789 static int svg_is_int_step(double a, double b)
790 {
791 double diff = fabs(a - b);
792 return floor(diff) == diff;
793 }
795 static int svg_path_straight_segment(FILE *fp,
796 double lastA, double currentA, double currentB,
797 gfx_node_t *node,
798 int segment_idx, int isx, char absChar, char relChar)
799 {
800 if (!svg_is_int_step(lastA, currentA)) {
801 putc(absChar, fp);
802 svg_write_number(fp, currentA);
803 return 0;
804 }
805 if (segment_idx < node->points - 1) {
806 ArtVpath *vec = node->path + segment_idx + 1;
807 if (vec->code == ART_LINETO) {
808 double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
809 double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
810 if (nextB == currentB
811 && ((currentA >= lastA) == (nextA >= currentA))
812 && svg_is_int_step(currentA, nextA)) {
813 return 1; /* skip to next as it is a straight line */
814 }
815 }
816 }
817 putc(relChar, fp);
818 svg_write_number(fp, currentA - lastA);
819 return 0;
820 }
822 static void svg_path(FILE *fp, gfx_node_t *node, int multi)
823 {
824 int i;
825 double lastX = 0, lastY = 0;
826 /* for straight lines <path..> tags take less space than
827 <line..> tags because of the efficient packing
828 in the 'd' attribute */
829 svg_start_tag(fp, "path");
830 if (!multi)
831 svg_common_path_attributes(fp, node);
832 fputs(" d=\"", fp);
833 /* specification of the 'd' attribute: */
834 /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
835 for (i = 0; i < node->points; i++) {
836 ArtVpath *vec = node->path + i;
837 double x = vec->x - LINEOFFSET;
838 double y = vec->y - LINEOFFSET;
839 switch (vec->code) {
840 case ART_MOVETO_OPEN: /* fall-through */
841 case ART_MOVETO:
842 putc('M', fp);
843 svg_write_number(fp, x);
844 putc(',', fp);
845 svg_write_number(fp, y);
846 break;
847 case ART_LINETO:
848 /* try optimize filesize by using minimal lineto commands */
849 /* without introducing rounding errors. */
850 if (x == lastX) {
851 if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
852 continue;
853 } else if (y == lastY) {
854 if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
855 continue;
856 } else {
857 putc('L', fp);
858 svg_write_number(fp, x);
859 putc(',', fp);
860 svg_write_number(fp, y);
861 }
862 break;
863 case ART_CURVETO: break; /* unsupported */
864 case ART_END: break; /* nop */
865 }
866 lastX = x;
867 lastY = y;
868 }
869 if (node->closed_path)
870 fputs(" Z", fp);
871 fputs("\"", fp);
872 svg_close_tag_empty_node(fp);
873 }
875 static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
876 {
877 /* optimize for multiple paths with the same color, penwidth, etc. */
878 int num = 1;
879 gfx_node_t *node = *nodeR;
880 gfx_node_t *next = node->next;
881 while (next) {
882 if (next->type != node->type
883 || next->size != node->size
884 || next->color != node->color
885 || next->dash_on != node->dash_on
886 || next->dash_off != node->dash_off)
887 break;
888 next = next->next;
889 num++;
890 }
891 if (num == 1) {
892 svg_path(fp, node, 0);
893 return;
894 }
895 svg_start_tag(fp, "g");
896 svg_common_path_attributes(fp, node);
897 svg_close_tag(fp);
898 while (num && node) {
899 svg_path(fp, node, 1);
900 if (!--num)
901 break;
902 node = node->next;
903 *nodeR = node;
904 }
905 svg_end_tag(fp, "g");
906 }
908 static void svg_area(FILE *fp, gfx_node_t *node)
909 {
910 int i;
911 double startX = 0, startY = 0;
912 svg_start_tag(fp, "polygon");
913 fputs(" ", fp);
914 svg_write_color(fp, node->color, "fill");
915 fputs(" points=\"", fp);
916 for (i = 0; i < node->points; i++) {
917 ArtVpath *vec = node->path + i;
918 double x = vec->x - LINEOFFSET;
919 double y = vec->y - LINEOFFSET;
920 switch (vec->code) {
921 case ART_MOVETO_OPEN: /* fall-through */
922 case ART_MOVETO:
923 svg_write_number(fp, x);
924 putc(',', fp);
925 svg_write_number(fp, y);
926 startX = x;
927 startY = y;
928 break;
929 case ART_LINETO:
930 if (i == node->points - 2
931 && node->path[i + 1].code == ART_END
932 && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
933 break; /* poly area always closed, no need for last point */
934 }
935 putc(' ', fp);
936 svg_write_number(fp, x);
937 putc(',', fp);
938 svg_write_number(fp, y);
939 break;
940 case ART_CURVETO: break; /* unsupported */
941 case ART_END: break; /* nop */
942 }
943 }
944 fputs("\"", fp);
945 svg_close_tag_empty_node(fp);
946 }
948 static void svg_text(FILE *fp, gfx_node_t *node)
949 {
950 double x = node->x - LINEOFFSET;
951 double y = node->y - LINEOFFSET;
952 if (node->angle != 0) {
953 svg_start_tag(fp, "g");
954 fputs(" transform=\"translate(", fp);
955 svg_write_number(fp, x);
956 fputs(",", fp);
957 svg_write_number(fp, y);
958 fputs(") rotate(", fp);
959 svg_write_number(fp, node->angle);
960 fputs(")\"", fp);
961 x = y = 0;
962 svg_close_tag(fp);
963 }
964 switch (node->valign) {
965 case GFX_V_TOP: y += node->size; break;
966 case GFX_V_CENTER: y += node->size / 3; break;
967 case GFX_V_BOTTOM: break;
968 case GFX_V_NULL: break;
969 }
970 svg_start_tag(fp, "text");
971 fputs(" x=\"", fp);
972 svg_write_number(fp, x);
973 fputs("\" y=\"", fp);
974 svg_write_number(fp, y);
975 if (strcmp(node->filename, svg_default_font))
976 fprintf(fp, " font-family=\"%s\"", node->filename);
977 fputs("\" font-size=\"", fp);
978 svg_write_number(fp, node->size);
979 fputs("\"", fp);
980 if (!svg_color_is_black(node->color))
981 svg_write_color(fp, node->color, "fill");
982 switch (node->halign) {
983 case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
984 case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
985 case GFX_H_LEFT: break;
986 case GFX_H_NULL: break;
987 }
988 svg_close_tag_single_line(fp);
989 /* support for node->tabwidth missing */
990 svg_write_text(fp, node->text);
991 svg_end_tag(fp, "text");
992 if (node->angle != 0)
993 svg_end_tag(fp, "g");
994 }
996 int gfx_render_svg (gfx_canvas_t *canvas,
997 art_u32 width, art_u32 height,
998 gfx_color_t background, FILE *fp){
999 gfx_node_t *node = canvas->firstnode;
1000 fputs(
1001 "<?xml version=\"1.0\" standalone=\"no\"?>\n"
1002 "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
1003 " \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
1004 "<!--\n"
1005 " SVG file created by RRDtool,\n"
1006 " Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
1007 "\n"
1008 " The width/height attributes in the outhermost svg node\n"
1009 " are just default sizes for the browser which is used\n"
1010 " if the svg file is openened directly without being\n"
1011 " embedded in an html file.\n"
1012 " The viewBox is the local coord system for rrdtool.\n"
1013 "-->\n", fp);
1014 svg_start_tag(fp, "svg");
1015 fputs(" width=\"", fp);
1016 svg_write_number(fp, width * canvas->zoom);
1017 fputs("\" height=\"", fp);
1018 svg_write_number(fp, height * canvas->zoom);
1019 fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
1020 svg_write_number(fp, -LINEOFFSET);
1021 fputs(" ", fp);
1022 svg_write_number(fp, -LINEOFFSET);
1023 fputs(" ", fp);
1024 svg_write_number(fp, width - LINEOFFSET);
1025 fputs(" ", fp);
1026 svg_write_number(fp, height - LINEOFFSET);
1027 fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
1028 fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
1029 fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
1030 svg_close_tag(fp);
1031 svg_start_tag(fp, "rect");
1032 fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
1033 svg_write_color(fp, background, "fill");
1034 svg_close_tag_empty_node(fp);
1035 while (node) {
1036 switch (node->type) {
1037 case GFX_LINE:
1038 svg_multi_path(fp, &node);
1039 break;
1040 case GFX_AREA:
1041 svg_area(fp, node);
1042 break;
1043 case GFX_TEXT:
1044 svg_text(fp, node);
1045 }
1046 node = node->next;
1047 }
1048 svg_end_tag(fp, "svg");
1049 return 0;
1050 }
1052 /* ------- EPS -------
1053 EPS and Postscript references:
1054 http://partners.adobe.com/asn/developer/technotes/postscript.html
1055 */
1057 typedef struct eps_font
1058 {
1059 const char *ps_font;
1060 int id;
1061 struct eps_font *next;
1062 } eps_font;
1064 typedef struct eps_state
1065 {
1066 FILE *fp;
1067 gfx_canvas_t *canvas;
1068 art_u32 page_width, page_height;
1069 eps_font *font_list;
1070 /*--*/
1071 gfx_color_t color;
1072 const char *font;
1073 double font_size;
1074 double line_width;
1075 int linecap, linejoin;
1076 int has_dash;
1077 } eps_state;
1079 static void eps_set_color(eps_state *state, gfx_color_t color)
1080 {
1081 /* gfx_color_t is RRGGBBAA */
1082 if (state->color == color)
1083 return;
1084 fprintf(state->fp, "%d %d %d Rgb\n",
1085 (int)((color >> 24) & 255),
1086 (int)((color >> 16) & 255),
1087 (int)((color >> 8) & 255));
1088 state->color = color;
1089 }
1091 static int eps_add_font(eps_state *state, gfx_node_t *node)
1092 {
1093 /* The fonts list could be postponed to the end using
1094 (atend), but let's be nice and have them in the header. */
1095 const char *ps_font = afm_get_font_postscript_name(node->filename);
1096 eps_font *ef;
1097 for (ef = state->font_list; ef; ef = ef->next) {
1098 if (!strcmp(ps_font, ef->ps_font))
1099 return 0;
1100 }
1101 ef = malloc(sizeof(eps_font));
1102 if (ef == NULL) {
1103 rrd_set_error("malloc for eps_font");
1104 return -1;
1105 }
1106 ef->next = state->font_list;
1107 ef->ps_font = ps_font;
1108 state->font_list = ef;
1109 return 0;
1110 }
1112 static void eps_list_fonts(eps_state *state, const char *dscName)
1113 {
1114 eps_font *ef;
1115 int lineLen = strlen(dscName);
1116 if (!state->font_list)
1117 return;
1118 fputs(dscName, state->fp);
1119 for (ef = state->font_list; ef; ef = ef->next) {
1120 int nameLen = strlen(ef->ps_font);
1121 if (lineLen + nameLen > 100 && lineLen) {
1122 fputs("\n", state->fp);
1123 fputs("%%- \n", state->fp);
1124 lineLen = 5;
1125 } else {
1126 fputs(" ", state->fp);
1127 lineLen++;
1128 }
1129 fputs(ef->ps_font, state->fp);
1130 lineLen += nameLen;
1131 }
1132 fputs("\n", state->fp);
1133 }
1135 static void eps_define_fonts(eps_state *state)
1136 {
1137 eps_font *ef;
1138 if (!state->font_list)
1139 return;
1140 for (ef = state->font_list; ef; ef = ef->next) {
1141 /* PostScript¨ LANGUAGE REFERENCE third edition
1142 page 349 */
1143 fprintf(state->fp,
1144 "%%\n"
1145 "/%s findfont dup length dict begin\n"
1146 "{ 1 index /FID ne {def} {pop pop} ifelse } forall\n"
1147 "/Encoding ISOLatin1Encoding def\n"
1148 "currentdict end\n"
1149 "/%s-ISOLatin1 exch definefont pop\n"
1150 "/SetFont-%s { /%s-ISOLatin1 findfont exch scalefont setfont } bd\n",
1151 ef->ps_font, ef->ps_font, ef->ps_font, ef->ps_font);
1152 }
1153 }
1155 static int eps_prologue(eps_state *state)
1156 {
1157 gfx_node_t *node;
1158 fputs(
1159 "%!PS-Adobe-3.0 EPSF-3.0\n"
1160 "%%Creator: RRDtool 1.1.x, Tobias Oetiker, http://tobi.oetiker.ch\n"
1161 /* can't like weird chars here */
1162 "%%Title: (RRDTool output)\n"
1163 "%%DocumentData: Clean7Bit\n"
1164 "", state->fp);
1165 fprintf(state->fp, "%%%%BoundingBox: 0 0 %d %d\n",
1166 state->page_width, state->page_height);
1167 for (node = state->canvas->firstnode; node; node = node->next) {
1168 if (node->type == GFX_TEXT && eps_add_font(state, node) == -1)
1169 return -1;
1170 }
1171 eps_list_fonts(state, "%%DocumentFonts:");
1172 eps_list_fonts(state, "%%DocumentNeededFonts:");
1173 fputs(
1174 "%%EndComments\n"
1175 "%%BeginProlog\n"
1176 "%%EndProlog\n" /* must have, or BoundingBox is ignored */
1177 "/bd { bind def } bind def\n"
1178 "", state->fp);
1179 fprintf(state->fp, "/X { %.2f add } bd\n", LINEOFFSET);
1180 fputs(
1181 "/X2 {X exch X exch} bd\n"
1182 "/M {X2 moveto} bd\n"
1183 "/L {X2 lineto} bd\n"
1184 "/m {moveto} bd\n"
1185 "/l {lineto} bd\n"
1186 "/S {stroke} bd\n"
1187 "/CP {closepath} bd\n"
1188 "/WS {setlinewidth stroke} bd\n"
1189 "/F {fill} bd\n"
1190 "/TaL { } bd\n"
1191 "/TaC {dup stringwidth pop neg 2 div 0 rmoveto } bd\n"
1192 "/TaR {dup stringwidth pop neg 0 rmoveto } bd\n"
1193 "/TL {moveto TaL show} bd\n"
1194 "/TC {moveto TaC show} bd\n"
1195 "/TR {moveto TaR show} bd\n"
1196 "/Rgb { 255.0 div 3 1 roll\n"
1197 " 255.0 div 3 1 roll \n"
1198 " 255.0 div 3 1 roll setrgbcolor } bd\n"
1199 "", state->fp);
1200 eps_define_fonts(state);
1201 return 0;
1202 }
1204 static void eps_clear_dash(eps_state *state)
1205 {
1206 if (!state->has_dash)
1207 return;
1208 state->has_dash = 0;
1209 fputs("[1 0] 0 setdash\n", state->fp);
1210 }
1212 static void eps_write_linearea(eps_state *state, gfx_node_t *node)
1213 {
1214 int i;
1215 FILE *fp = state->fp;
1216 int useOffset = 0;
1217 int clearDashIfAny = 1;
1218 eps_set_color(state, node->color);
1219 if (node->type == GFX_LINE) {
1220 svg_dash dash_info;
1221 if (state->linecap != 1) {
1222 fputs("1 setlinecap\n", fp);
1223 state->linecap = 1;
1224 }
1225 if (state->linejoin != 1) {
1226 fputs("1 setlinejoin\n", fp);
1227 state->linejoin = 1;
1228 }
1229 svg_get_dash(node, &dash_info);
1230 if (dash_info.dash_enable) {
1231 clearDashIfAny = 0;
1232 state->has_dash = 1;
1233 fputs("[", fp);
1234 svg_write_number(fp, dash_info.adjusted_on);
1235 fputs(" ", fp);
1236 svg_write_number(fp, dash_info.adjusted_off);
1237 fputs("] ", fp);
1238 svg_write_number(fp, dash_info.dash_offset);
1239 fputs(" setdash\n", fp);
1240 }
1241 }
1242 if (clearDashIfAny)
1243 eps_clear_dash(state);
1244 for (i = 0; i < node->points; i++) {
1245 ArtVpath *vec = node->path + i;
1246 double x = vec->x;
1247 double y = state->page_height - vec->y;
1248 if (vec->code == ART_MOVETO_OPEN || vec->code == ART_MOVETO)
1249 useOffset = (fabs(x - floor(x) - 0.5) < 0.01 && fabs(y - floor(y) - 0.5) < 0.01);
1250 if (useOffset) {
1251 x -= LINEOFFSET;
1252 y -= LINEOFFSET;
1253 }
1254 switch (vec->code) {
1255 case ART_MOVETO_OPEN: /* fall-through */
1256 case ART_MOVETO:
1257 svg_write_number(fp, x);
1258 fputc(' ', fp);
1259 svg_write_number(fp, y);
1260 fputc(' ', fp);
1261 fputs(useOffset ? "M\n" : "m\n", fp);
1262 break;
1263 case ART_LINETO:
1264 svg_write_number(fp, x);
1265 fputc(' ', fp);
1266 svg_write_number(fp, y);
1267 fputc(' ', fp);
1268 fputs(useOffset ? "L\n" : "l\n", fp);
1269 break;
1270 case ART_CURVETO: break; /* unsupported */
1271 case ART_END: break; /* nop */
1272 }
1273 }
1274 if (node->type == GFX_LINE) {
1275 if (node->closed_path)
1276 fputs("CP ", fp);
1277 if (node->size != state->line_width) {
1278 state->line_width = node->size;
1279 svg_write_number(fp, state->line_width);
1280 fputs(" WS\n", fp);
1281 } else {
1282 fputs("S\n", fp);
1283 }
1284 } else {
1285 fputs("F\n", fp);
1286 }
1287 }
1289 static void eps_write_text(eps_state *state, gfx_node_t *node)
1290 {
1291 FILE *fp = state->fp;
1292 const unsigned char *p;
1293 const char *ps_font = afm_get_font_postscript_name(node->filename);
1294 char align = 'L';
1295 double x = node->x;
1296 double y = state->page_height - node->y, ydelta = 0;
1297 int lineLen = 0;
1298 eps_set_color(state, node->color);
1299 if (strcmp(ps_font, state->font) || node->size != state->font_size) {
1300 state->font = ps_font;
1301 state->font_size = node->size;
1302 svg_write_number(fp, state->font_size);
1303 fprintf(fp, " SetFont-%s\n", state->font);
1304 }
1305 fputs("(", fp);
1306 lineLen = 20;
1307 for (p = (const unsigned char*)node->text; *p; p++) {
1308 if (lineLen > 70) {
1309 fputs("\\\n", fp); /* backslash and \n */
1310 lineLen = 0;
1311 }
1312 switch (*p) {
1313 case '(':
1314 case ')':
1315 case '\\':
1316 case '\n':
1317 case '\r':
1318 case '\t':
1319 fputc('\\', fp);
1320 lineLen++;
1321 /* fall-through */
1322 default:
1323 if (*p >= 126)
1324 fprintf(fp, "\\%03o", *p);
1325 else
1326 fputc(*p, fp);
1327 lineLen++;
1328 }
1329 }
1330 fputs(") ", fp);
1331 switch(node->valign){
1332 case GFX_V_TOP: ydelta = -node->size; break;
1333 case GFX_V_CENTER: ydelta = -node->size / 3.0; break;
1334 case GFX_V_BOTTOM: break;
1335 case GFX_V_NULL: break;
1336 }
1337 if (node->angle == 0)
1338 y += ydelta;
1339 switch (node->halign) {
1340 case GFX_H_RIGHT: align = 'R'; break;
1341 case GFX_H_CENTER: align = 'C'; break;
1342 case GFX_H_LEFT: align= 'L'; break;
1343 case GFX_H_NULL: align= 'L'; break;
1344 }
1345 if (node->angle != 0) {
1346 fputs("\n", fp);
1347 fputs(" gsave ", fp);
1348 svg_write_number(fp, x);
1349 fputc(' ', fp);
1350 svg_write_number(fp, y);
1351 fputs(" translate ", fp);
1352 svg_write_number(fp, -node->angle);
1353 fputs(" rotate 0 ", fp);
1354 svg_write_number(fp, ydelta);
1355 fputs(" moveto ", fp);
1356 fprintf(fp, "Ta%c", align);
1357 fputs(" show grestore\n", fp);
1358 } else {
1359 svg_write_number(fp, x);
1360 fputc(' ', fp);
1361 svg_write_number(fp, y);
1362 fputs(" T", fp);
1363 fputc(align, fp);
1364 fputc('\n', fp);
1365 }
1366 }
1368 static int eps_write_content(eps_state *state)
1369 {
1370 gfx_node_t *node;
1371 fputs("%\n", state->fp);
1372 for (node = state->canvas->firstnode; node; node = node->next) {
1373 switch (node->type) {
1374 case GFX_LINE:
1375 case GFX_AREA:
1376 eps_write_linearea(state, node);
1377 break;
1378 case GFX_TEXT:
1379 eps_write_text(state, node);
1380 break;
1381 }
1382 }
1383 return 0;
1384 }
1386 int gfx_render_eps (gfx_canvas_t *canvas,
1387 art_u32 width, art_u32 height,
1388 gfx_color_t background, FILE *fp){
1389 struct eps_state state;
1390 state.fp = fp;
1391 state.canvas = canvas;
1392 state.page_width = width;
1393 state.page_height = height;
1394 state.font = "no-default-font";
1395 state.font_size = -1;
1396 state.color = 0; /* black */
1397 state.font_list = NULL;
1398 state.linecap = -1;
1399 state.linejoin = -1;
1400 state.has_dash = 0;
1401 if (eps_prologue(&state) == -1)
1402 return -1;
1403 eps_set_color(&state, background);
1404 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1405 height, width, height, width);
1406 if (eps_write_content(&state) == -1)
1407 return 0;
1408 fputs("showpage\n", fp);
1409 fputs("%%EOF\n", fp);
1410 while (state.font_list) {
1411 eps_font *next = state.font_list->next;
1412 free(state.font_list);
1413 state.font_list = next;
1414 }
1415 return 0;
1416 }
1418 /* ------- PDF -------
1419 PDF references page:
1420 http://partners.adobe.com/asn/developer/technotes/acrobatpdf.html
1421 */
1423 typedef struct pdf_buffer
1424 {
1425 int id, is_obj, is_dict, is_stream, pdf_file_pos;
1426 char *data;
1427 int alloc_size, current_size;
1428 struct pdf_buffer *previous_buffer, *next_buffer;
1429 struct pdf_state *state;
1430 } pdf_buffer;
1432 typedef struct pdf_font
1433 {
1434 const char *ps_font;
1435 pdf_buffer obj;
1436 struct pdf_font *next;
1437 } pdf_font;
1439 typedef struct pdf_state
1440 {
1441 FILE *fp;
1442 gfx_canvas_t *canvas;
1443 art_u32 page_width, page_height;
1444 pdf_font *font_list;
1445 pdf_buffer *first_buffer, *last_buffer;
1446 int pdf_file_pos;
1447 int has_failed;
1448 /*--*/
1449 gfx_color_t stroke_color, fill_color;
1450 int font_id;
1451 double font_size;
1452 double line_width;
1453 svg_dash dash;
1454 int linecap, linejoin;
1455 int last_obj_id;
1456 /*--*/
1457 pdf_buffer pdf_header;
1458 pdf_buffer catalog_obj, pages_obj, page1_obj;
1459 pdf_buffer fontsdict_obj;
1460 pdf_buffer graph_stream;
1461 } pdf_state;
1463 static void pdf_init_buffer(pdf_state *state, pdf_buffer *buf)
1464 {
1465 int initial_size = 32;
1466 buf->state = state;
1467 buf->id = -42;
1468 buf->alloc_size = 0;
1469 buf->current_size = 0;
1470 buf->data = (char*)malloc(initial_size);
1471 buf->is_obj = 0;
1472 buf->previous_buffer = NULL;
1473 buf->next_buffer = NULL;
1474 if (buf->data == NULL) {
1475 rrd_set_error("malloc for pdf_buffer data");
1476 state->has_failed = 1;
1477 return;
1478 }
1479 buf->alloc_size = initial_size;
1480 if (state->last_buffer)
1481 state->last_buffer->next_buffer = buf;
1482 if (state->first_buffer == NULL)
1483 state->first_buffer = buf;
1484 buf->previous_buffer = state->last_buffer;
1485 state->last_buffer = buf;
1486 }
1488 static void pdf_put(pdf_buffer *buf, const char *text, int len)
1489 {
1490 if (len <= 0)
1491 return;
1492 if (buf->alloc_size < buf->current_size + len) {
1493 int new_size = buf->alloc_size;
1494 char *new_buf;
1495 while (new_size < buf->current_size + len)
1496 new_size *= 4;
1497 new_buf = (char*)malloc(new_size);
1498 if (new_buf == NULL) {
1499 rrd_set_error("re-malloc for pdf_buffer data");
1500 buf->state->has_failed = 1;
1501 return;
1502 }
1503 memcpy(new_buf, buf->data, buf->current_size);
1504 free(buf->data);
1505 buf->data = new_buf;
1506 buf->alloc_size = new_size;
1507 }
1508 memcpy(buf->data + buf->current_size, text, len);
1509 buf->current_size += len;
1510 }
1512 static void pdf_puts(pdf_buffer *buf, const char *text)
1513 {
1514 pdf_put(buf, text, strlen(text));
1515 }
1517 static void pdf_indent(pdf_buffer *buf)
1518 {
1519 pdf_puts(buf, "\t");
1520 }
1522 static void pdf_putsi(pdf_buffer *buf, const char *text)
1523 {
1524 pdf_indent(buf);
1525 pdf_puts(buf, text);
1526 }
1528 static void pdf_putint(pdf_buffer *buf, int i)
1529 {
1530 char tmp[20];
1531 sprintf(tmp, "%d", i);
1532 pdf_puts(buf, tmp);
1533 }
1535 static void pdf_putnumber(pdf_buffer *buf, double d)
1536 {
1537 char tmp[50];
1538 svg_format_number(tmp, sizeof(tmp), d);
1539 pdf_puts(buf, tmp);
1540 }
1542 static void pdf_init_object(pdf_state *state, pdf_buffer *buf)
1543 {
1544 pdf_init_buffer(state, buf);
1545 buf->id = ++state->last_obj_id;
1546 buf->is_obj = 1;
1547 }
1549 static void pdf_init_dict(pdf_state *state, pdf_buffer *buf)
1550 {
1551 pdf_init_object(state, buf);
1552 buf->is_dict = 1;
1553 }
1555 static void pdf_set_color(pdf_buffer *buf, gfx_color_t color,
1556 gfx_color_t *current_color, const char *op)
1557 {
1558 /* gfx_color_t is RRGGBBAA */
1559 if (*current_color == color)
1560 return;
1561 pdf_putnumber(buf, ((color >> 24) & 255) / 255.0);
1562 pdf_puts(buf, " ");
1563 pdf_putnumber(buf, ((color >> 16) & 255) / 255.0);
1564 pdf_puts(buf, " ");
1565 pdf_putnumber(buf, ((color >> 8) & 255) / 255.0);
1566 pdf_puts(buf, " ");
1567 pdf_puts(buf, op);
1568 pdf_puts(buf, "\n");
1569 *current_color = color;
1570 }
1572 static void pdf_set_stroke_color(pdf_buffer *buf, gfx_color_t color)
1573 {
1574 pdf_set_color(buf, color, &buf->state->stroke_color, "RG");
1575 }
1577 static void pdf_set_fill_color(pdf_buffer *buf, gfx_color_t color)
1578 {
1579 pdf_set_color(buf, color, &buf->state->fill_color, "rg");
1580 }
1582 static pdf_font *pdf_find_font(pdf_state *state, gfx_node_t *node)
1583 {
1584 const char *ps_font = afm_get_font_postscript_name(node->filename);
1585 pdf_font *ef;
1586 for (ef = state->font_list; ef; ef = ef->next) {
1587 if (!strcmp(ps_font, ef->ps_font))
1588 return ef;
1589 }
1590 return NULL;
1591 }
1593 static void pdf_add_font(pdf_state *state, gfx_node_t *node)
1594 {
1595 pdf_font *ef = pdf_find_font(state, node);
1596 if (ef)
1597 return;
1598 ef = malloc(sizeof(pdf_font));
1599 if (ef == NULL) {
1600 rrd_set_error("malloc for pdf_font");
1601 state->has_failed = 1;
1602 return;
1603 }
1604 pdf_init_dict(state, &ef->obj);
1605 ef->next = state->font_list;
1606 ef->ps_font = afm_get_font_postscript_name(node->filename);
1607 state->font_list = ef;
1608 /* fonts dict */
1609 pdf_putsi(&state->fontsdict_obj, "/F");
1610 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1611 pdf_puts(&state->fontsdict_obj, " ");
1612 pdf_putint(&state->fontsdict_obj, ef->obj.id);
1613 pdf_puts(&state->fontsdict_obj, " 0 R\n");
1614 /* fonts def */
1615 pdf_putsi(&ef->obj, "/Type /Font\n");
1616 pdf_putsi(&ef->obj, "/Subtype /Type1\n");
1617 pdf_putsi(&ef->obj, "/Name /F");
1618 pdf_putint(&ef->obj, ef->obj.id);
1619 pdf_puts(&ef->obj, "\n");
1620 pdf_putsi(&ef->obj, "/BaseFont /");
1621 pdf_puts(&ef->obj, ef->ps_font);
1622 pdf_puts(&ef->obj, "\n");
1623 pdf_putsi(&ef->obj, "/Encoding /WinAnsiEncoding\n");
1624 /* 'Cp1252' (this is latin 1 extended with 27 characters;
1625 the encoding is also known as 'winansi')
1626 http://www.lowagie.com/iText/tutorial/ch09.html */
1627 }
1629 static void pdf_create_fonts(pdf_state *state)
1630 {
1631 gfx_node_t *node;
1632 for (node = state->canvas->firstnode; node; node = node->next) {
1633 if (node->type == GFX_TEXT)
1634 pdf_add_font(state, node);
1635 }
1636 }
1638 static void pdf_write_linearea(pdf_state *state, gfx_node_t *node)
1639 {
1640 int i;
1641 pdf_buffer *s = &state->graph_stream;
1642 if (node->type == GFX_LINE) {
1643 svg_dash dash_info;
1644 svg_get_dash(node, &dash_info);
1645 if (!svg_dash_equal(&dash_info, &state->dash)) {
1646 state->dash = dash_info;
1647 if (dash_info.dash_enable) {
1648 pdf_puts(s, "[");
1649 pdf_putnumber(s, dash_info.adjusted_on);
1650 pdf_puts(s, " ");
1651 pdf_putnumber(s, dash_info.adjusted_off);
1652 pdf_puts(s, "] ");
1653 pdf_putnumber(s, dash_info.dash_offset);
1654 pdf_puts(s, " d\n");
1655 } else {
1656 pdf_puts(s, "[] 0 d\n");
1657 }
1658 }
1659 pdf_set_stroke_color(s, node->color);
1660 if (state->linecap != 1) {
1661 pdf_puts(s, "1 j\n");
1662 state->linecap = 1;
1663 }
1664 if (state->linejoin != 1) {
1665 pdf_puts(s, "1 J\n");
1666 state->linejoin = 1;
1667 }
1668 if (node->size != state->line_width) {
1669 state->line_width = node->size;
1670 pdf_putnumber(s, state->line_width);
1671 pdf_puts(s, " w\n");
1672 }
1673 } else {
1674 pdf_set_fill_color(s, node->color);
1675 }
1676 for (i = 0; i < node->points; i++) {
1677 ArtVpath *vec = node->path + i;
1678 double x = vec->x;
1679 double y = state->page_height - vec->y;
1680 if (node->type == GFX_AREA) {
1681 x += LINEOFFSET; /* adjust for libart handling of areas */
1682 y -= LINEOFFSET;
1683 }
1684 switch (vec->code) {
1685 case ART_MOVETO_OPEN: /* fall-through */
1686 case ART_MOVETO:
1687 pdf_putnumber(s, x);
1688 pdf_puts(s, " ");
1689 pdf_putnumber(s, y);
1690 pdf_puts(s, " m\n");
1691 break;
1692 case ART_LINETO:
1693 pdf_putnumber(s, x);
1694 pdf_puts(s, " ");
1695 pdf_putnumber(s, y);
1696 pdf_puts(s, " l\n");
1697 break;
1698 case ART_CURVETO: break; /* unsupported */
1699 case ART_END: break; /* nop */
1700 }
1701 }
1702 if (node->type == GFX_LINE) {
1703 pdf_puts(s, node->closed_path ? "s\n" : "S\n");
1704 } else {
1705 pdf_puts(s, "f\n");
1706 }
1707 }
1709 static void pdf_write_text(pdf_state *state, gfx_node_t *node,
1710 int last_was_text, int next_is_text)
1711 {
1712 char tmp[30];
1713 pdf_buffer *s = &state->graph_stream;
1714 const unsigned char *p;
1715 pdf_font *font = pdf_find_font(state, node);
1716 double x = node->x;
1717 double y = state->page_height - node->y;
1718 double dx = 0, dy = 0;
1719 double cos_a = 0, sin_a = 0;
1720 if (font == NULL) {
1721 rrd_set_error("font disappeared");
1722 state->has_failed = 1;
1723 return;
1724 }
1725 switch(node->valign){
1726 case GFX_V_TOP: dy = -node->size; break;
1727 case GFX_V_CENTER: dy = -node->size / 3.0; break;
1728 case GFX_V_BOTTOM: break;
1729 case GFX_V_NULL: break;
1730 }
1731 switch (node->halign) {
1732 case GFX_H_RIGHT: dx = -afm_get_text_width(0, font->ps_font,
1733 node->size, node->tabwidth, node->text);
1734 break;
1735 case GFX_H_CENTER: dx = -afm_get_text_width(0, font->ps_font,
1736 node->size, node->tabwidth, node->text) / 2;
1737 break;
1738 case GFX_H_LEFT: break;
1739 case GFX_H_NULL: break;
1740 }
1741 pdf_set_fill_color(s, node->color);
1742 if (node->angle != 0) {
1743 double a = 2 * M_PI * -node->angle / 360.0;
1744 double new_x, new_y;
1745 cos_a = cos(a);
1746 sin_a = sin(a);
1747 new_x = cos_a * dx - sin_a * dy + x;
1748 new_y = sin_a * dx + cos_a * dy + y;
1749 x = new_x;
1750 y = new_y;
1751 } else {
1752 x += dx;
1753 y += dy;
1754 }
1755 if (!last_was_text)
1756 pdf_puts(s, "BT\n");
1757 if (state->font_id != font->obj.id || node->size != state->font_size) {
1758 state->font_id = font->obj.id;
1759 state->font_size = node->size;
1760 pdf_puts(s, "/F");
1761 pdf_putint(s, font->obj.id);
1762 pdf_puts(s, " ");
1763 pdf_putnumber(s, node->size);
1764 pdf_puts(s, " Tf\n");
1765 }
1766 if (node->angle == 0) {
1767 pdf_puts(s, "1 0 0 1 ");
1768 } else {
1769 pdf_putnumber(s, cos_a);
1770 pdf_puts(s, " ");
1771 pdf_putnumber(s, sin_a);
1772 pdf_puts(s, " ");
1773 pdf_putnumber(s, -sin_a);
1774 pdf_puts(s, " ");
1775 pdf_putnumber(s, cos_a);
1776 pdf_puts(s, " ");
1777 }
1778 pdf_putnumber(s, x);
1779 pdf_puts(s, " ");
1780 pdf_putnumber(s, y);
1781 pdf_puts(s, " Tm\n");
1782 pdf_puts(s, "(");
1783 for (p = (const unsigned char*)node->text; *p; p++) {
1784 switch (*p) {
1785 case '(':
1786 case ')':
1787 case '\\':
1788 case '\n':
1789 case '\r':
1790 case '\t':
1791 pdf_puts(s, "\\");
1792 /* fall-through */
1793 default:
1794 if (*p >= 126) {
1795 snprintf(tmp, sizeof(tmp), "\\%03o", *p);
1796 pdf_puts(s, tmp);
1797 } else {
1798 pdf_put(s, (const char*)p, 1);
1799 }
1800 }
1801 }
1802 pdf_puts(s, ") Tj\n");
1803 if (!next_is_text)
1804 pdf_puts(s, "ET\n");
1805 }
1807 static void pdf_write_content(pdf_state *state)
1808 {
1809 gfx_node_t *node;
1810 int last_was_text = 0, next_is_text;
1811 for (node = state->canvas->firstnode; node; node = node->next) {
1812 switch (node->type) {
1813 case GFX_LINE:
1814 case GFX_AREA:
1815 pdf_write_linearea(state, node);
1816 break;
1817 case GFX_TEXT:
1818 next_is_text = node->next && node->next->type == GFX_TEXT;
1819 pdf_write_text(state, node, last_was_text, next_is_text);
1820 break;
1821 }
1822 last_was_text = node->type == GFX_TEXT;
1823 }
1824 }
1826 static void pdf_init_document(pdf_state *state)
1827 {
1828 pdf_init_buffer(state, &state->pdf_header);
1829 pdf_init_dict(state, &state->catalog_obj);
1830 pdf_init_dict(state, &state->pages_obj);
1831 pdf_init_dict(state, &state->page1_obj);
1832 pdf_init_dict(state, &state->fontsdict_obj);
1833 state->graph_stream.is_stream = 1;
1834 pdf_create_fonts(state);
1835 if (state->has_failed)
1836 return;
1837 /* make stream last object in file */
1838 pdf_init_object(state, &state->graph_stream);
1839 }
1841 static void pdf_setup_document(pdf_state *state)
1842 {
1843 /* all objects created by now, so init code can reference them */
1844 /* HEADER */
1845 pdf_puts(&state->pdf_header, "%PDF-1.3\n");
1846 /* following 8 bit comment is recommended by Adobe for
1847 indicating binary file to file transfer applications */
1848 pdf_puts(&state->pdf_header, "%\xE2\xE3\xCF\xD3\n");
1849 /* CATALOG */
1850 pdf_putsi(&state->catalog_obj, "/Type /Catalog\n");
1851 pdf_putsi(&state->catalog_obj, "/Pages ");
1852 pdf_putint(&state->catalog_obj, state->pages_obj.id);
1853 pdf_puts(&state->catalog_obj, " 0 R\n");
1854 /* PAGES */
1855 pdf_putsi(&state->pages_obj, "/Type /Pages\n");
1856 pdf_putsi(&state->pages_obj, "/Kids [");
1857 pdf_putint(&state->pages_obj, state->page1_obj.id);
1858 pdf_puts(&state->pages_obj, " 0 R]\n");
1859 pdf_putsi(&state->pages_obj, "/Count 1\n");
1860 /* PAGE 1 */
1861 pdf_putsi(&state->page1_obj, "/Type /Page\n");
1862 pdf_putsi(&state->page1_obj, "/Parent ");
1863 pdf_putint(&state->page1_obj, state->pages_obj.id);
1864 pdf_puts(&state->page1_obj, " 0 R\n");
1865 pdf_putsi(&state->page1_obj, "/MediaBox [0 0 ");
1866 pdf_putint(&state->page1_obj, state->page_width);
1867 pdf_puts(&state->page1_obj, " ");
1868 pdf_putint(&state->page1_obj, state->page_height);
1869 pdf_puts(&state->page1_obj, "]\n");
1870 pdf_putsi(&state->page1_obj, "/Contents ");
1871 pdf_putint(&state->page1_obj, state->graph_stream.id);
1872 pdf_puts(&state->page1_obj, " 0 R\n");
1873 pdf_putsi(&state->page1_obj, "/Resources << /Font ");
1874 pdf_putint(&state->page1_obj, state->fontsdict_obj.id);
1875 pdf_puts(&state->page1_obj, " 0 R >>\n");
1876 }
1878 static void pdf_write_string_to_file(pdf_state *state, const char *text)
1879 {
1880 fputs(text, state->fp);
1881 state->pdf_file_pos += strlen(text);
1882 }
1884 static void pdf_write_buf_to_file(pdf_state *state, pdf_buffer *buf)
1885 {
1886 char tmp[40];
1887 buf->pdf_file_pos = state->pdf_file_pos;
1888 if (buf->is_obj) {
1889 snprintf(tmp, sizeof(tmp), "%d 0 obj\n", buf->id);
1890 pdf_write_string_to_file(state, tmp);
1891 }
1892 if (buf->is_dict)
1893 pdf_write_string_to_file(state, "<<\n");
1894 if (buf->is_stream) {
1895 snprintf(tmp, sizeof(tmp), "<< /Length %d >>\n", buf->current_size);
1896 pdf_write_string_to_file(state, tmp);
1897 pdf_write_string_to_file(state, "stream\n");
1898 }
1899 fwrite(buf->data, 1, buf->current_size, state->fp);
1900 state->pdf_file_pos += buf->current_size;
1901 if (buf->is_stream)
1902 pdf_write_string_to_file(state, "endstream\n");
1903 if (buf->is_dict)
1904 pdf_write_string_to_file(state, ">>\n");
1905 if (buf->is_obj)
1906 pdf_write_string_to_file(state, "endobj\n");
1907 }
1909 static void pdf_write_to_file(pdf_state *state)
1910 {
1911 pdf_buffer *buf = state->first_buffer;
1912 int xref_pos;
1913 state->pdf_file_pos = 0;
1914 pdf_write_buf_to_file(state, &state->pdf_header);
1915 while (buf) {
1916 if (buf->is_obj)
1917 pdf_write_buf_to_file(state, buf);
1918 buf = buf->next_buffer;
1919 }
1920 xref_pos = state->pdf_file_pos;
1921 fprintf(state->fp, "xref\n");
1922 fprintf(state->fp, "%d %d\n", 0, state->last_obj_id + 1);
1923 /* TOC lines must be exactly 20 bytes including \n */
1924 fprintf(state->fp, "%010d %05d f\x20\n", 0, 65535);
1925 for (buf = state->first_buffer; buf; buf = buf->next_buffer) {
1926 if (buf->is_obj)
1927 fprintf(state->fp, "%010d %05d n\x20\n", buf->pdf_file_pos, 0);
1928 }
1929 fprintf(state->fp, "trailer\n");
1930 fprintf(state->fp, "<<\n");
1931 fprintf(state->fp, "\t/Size %d\n", state->last_obj_id + 1);
1932 fprintf(state->fp, "\t/Root %d 0 R\n", state->catalog_obj.id);
1933 fprintf(state->fp, ">>\n");
1934 fprintf(state->fp, "startxref\n");
1935 fprintf(state->fp, "%d\n", xref_pos);
1936 fputs("%%EOF\n", state->fp);
1937 }
1939 static void pdf_free_resources(pdf_state *state)
1940 {
1941 pdf_buffer *buf = state->first_buffer;
1942 while (buf) {
1943 free(buf->data);
1944 buf->data = NULL;
1945 buf->alloc_size = buf->current_size = 0;
1946 buf = buf->next_buffer;
1947 }
1948 while (state->font_list) {
1949 pdf_font *next = state->font_list->next;
1950 free(state->font_list);
1951 state->font_list = next;
1952 }
1953 }
1955 int gfx_render_pdf (gfx_canvas_t *canvas,
1956 art_u32 width, art_u32 height,
1957 gfx_color_t background, FILE *fp){
1958 struct pdf_state state;
1959 memset(&state, 0, sizeof(pdf_state));
1960 state.fp = fp;
1961 state.canvas = canvas;
1962 state.page_width = width;
1963 state.page_height = height;
1964 state.font_id = -1;
1965 state.font_size = -1;
1966 state.font_list = NULL;
1967 state.linecap = -1;
1968 state.linejoin = -1;
1969 pdf_init_document(&state);
1970 /*
1971 pdf_set_color(&state, background);
1972 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1973 height, width, height, width);
1974 */
1975 if (!state.has_failed)
1976 pdf_write_content(&state);
1977 if (!state.has_failed)
1978 pdf_setup_document(&state);
1979 if (!state.has_failed)
1980 pdf_write_to_file(&state);
1981 pdf_free_resources(&state);
1982 return state.has_failed ? -1 : 0;
1983 }