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 gfx_new_line(canvas, x - 3, y + 0, x, y, 0.2, 0x00FF0000);
203 gfx_new_line(canvas, x - 0, y + 3, x, y, 0.2, 0x00FF0000);
204 #endif
205 return node;
206 }
208 int gfx_render(gfx_canvas_t *canvas,
209 art_u32 width, art_u32 height,
210 gfx_color_t background, FILE *fp){
211 switch (canvas->imgformat) {
212 case IF_PNG:
213 return gfx_render_png (canvas, width, height, background, fp);
214 case IF_SVG:
215 return gfx_render_svg (canvas, width, height, background, fp);
216 case IF_EPS:
217 return gfx_render_eps (canvas, width, height, background, fp);
218 default:
219 return -1;
220 }
221 }
223 double gfx_get_text_width ( gfx_canvas_t *canvas,
224 double start, char* font, double size,
225 double tabwidth, char* text){
226 switch (canvas->imgformat) {
227 case IF_PNG:
228 return gfx_get_text_width_libart (canvas, start, font, size, tabwidth, text);
229 case IF_SVG: /* fall through */
230 case IF_EPS:
231 return afm_get_text_width(start, font, size, tabwidth, text);
232 default:
233 return size * strlen(text);
234 }
235 }
237 double gfx_get_text_width_libart ( gfx_canvas_t *canvas,
238 double start, char* font, double size,
239 double tabwidth, char* text){
241 FT_GlyphSlot slot;
242 FT_UInt previous=0;
243 FT_UInt glyph_index=0;
244 FT_Bool use_kerning;
245 int error;
246 FT_Face face;
247 FT_Library library=NULL;
248 double text_width=0;
249 FT_Init_FreeType( &library );
250 error = FT_New_Face( library, font, 0, &face );
251 if ( error ) return -1;
252 error = FT_Set_Char_Size(face, size*64,size*64, 100,100);
253 if ( error ) return -1;
255 use_kerning = FT_HAS_KERNING(face);
256 slot = face->glyph;
257 for(;*text;text++) {
258 previous = glyph_index;
259 glyph_index = FT_Get_Char_Index( face, *text);
261 if (use_kerning && previous && glyph_index){
262 FT_Vector delta;
263 FT_Get_Kerning( face, previous, glyph_index,
264 0, &delta );
265 text_width += (double)delta.x / 64.0;
267 }
268 error = FT_Load_Glyph( face, glyph_index, 0 );
269 if ( error ) {
270 FT_Done_FreeType(library);
271 return -1;
272 }
273 if (! previous) {
274 text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
275 }
276 text_width += (double)slot->metrics.horiAdvance / 64.0;
277 }
278 text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */
279 text_width += (double)slot->metrics.width / 64.0; /* add just char width */
280 text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
281 FT_Done_FreeType(library);
282 return text_width;
283 }
285 static void gfx_libart_close_path(gfx_canvas_t *canvas,
286 gfx_node_t *node, ArtVpath **vec)
287 {
288 /* libart must have end==start for closed paths,
289 even if using ART_MOVETO and not ART_MOVETO_OPEN
290 so add extra point which is the same as the starting point */
291 int points_max = node->points; /* scaled array has exact size */
292 int points = node->points - 1;
293 art_vpath_add_point (vec, &points, &points_max, ART_LINETO,
294 (**vec).x, (**vec).y);
295 art_vpath_add_point (vec, &points, &points_max, ART_END, 0, 0);
296 }
298 static void gfx_round_scaled_coordinates(gfx_canvas_t *canvas,
299 gfx_node_t *node, ArtVpath *vec)
300 {
301 while (vec->code != ART_END) {
302 vec->x = floor(vec->x - LINEOFFSET + 0.5) + LINEOFFSET;
303 vec->y = floor(vec->y - LINEOFFSET + 0.5) + LINEOFFSET;
304 vec++;
305 }
306 }
308 static int gfx_save_png (art_u8 *buffer, FILE *fp,
309 long width, long height, long bytes_per_pixel);
310 /* render grafics into png image */
311 int gfx_render_png (gfx_canvas_t *canvas,
312 art_u32 width, art_u32 height,
313 gfx_color_t background, FILE *fp){
316 FT_Library library;
317 gfx_node_t *node = canvas->firstnode;
318 art_u8 red = background >> 24, green = (background >> 16) & 0xff;
319 art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
320 unsigned long pys_width = width * canvas->zoom;
321 unsigned long pys_height = height * canvas->zoom;
322 const int bytes_per_pixel = 3;
323 unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
324 art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
325 art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height);
326 FT_Init_FreeType( &library );
327 while(node){
328 switch (node->type) {
329 case GFX_LINE:
330 case GFX_AREA: {
331 ArtVpath *vec;
332 double dst[6];
333 ArtSVP *svp;
334 art_affine_scale(dst,canvas->zoom,canvas->zoom);
335 vec = art_vpath_affine_transform(node->path,dst);
336 if (node->closed_path)
337 gfx_libart_close_path(canvas, node, &vec);
338 gfx_round_scaled_coordinates(canvas, node, vec);
339 if(node->type == GFX_LINE){
340 svp = art_svp_vpath_stroke ( vec, ART_PATH_STROKE_JOIN_ROUND,
341 ART_PATH_STROKE_CAP_ROUND,
342 node->size*canvas->zoom,1,1);
343 } else {
344 svp = art_svp_from_vpath ( vec );
345 }
346 art_free(vec);
347 art_rgb_svp_alpha (svp ,0,0, pys_width, pys_height,
348 node->color, buffer, rowstride, NULL);
349 art_free(svp);
350 break;
351 }
352 case GFX_TEXT: {
353 int error;
354 float text_width=0.0, text_height = 0.0;
355 unsigned char *text;
356 art_u8 fcolor[3],falpha;
357 FT_Face face;
358 FT_GlyphSlot slot;
359 FT_UInt previous=0;
360 FT_UInt glyph_index=0;
361 FT_Bool use_kerning;
363 float pen_x = 0.0 , pen_y = 0.0;
364 /* double x,y; */
365 long ix,iy,iz;
367 fcolor[0] = node->color >> 24;
368 fcolor[1] = (node->color >> 16) & 0xff;
369 fcolor[2] = (node->color >> 8) & 0xff;
370 falpha = node->color & 0xff;
371 error = FT_New_Face( library,
372 (char *)node->filename,
373 0,
374 &face );
375 if ( error ) break;
376 use_kerning = FT_HAS_KERNING(face);
378 error = FT_Set_Char_Size(face, /* handle to face object */
379 (long)(node->size*64),
380 (long)(node->size*64),
381 (long)(100*canvas->zoom),
382 (long)(100*canvas->zoom));
383 if ( error ) break;
384 pen_x = node->x * canvas->zoom;
385 pen_y = node->y * canvas->zoom;
386 slot = face->glyph;
388 for(text=(unsigned char *)node->text;*text;text++) {
389 previous = glyph_index;
390 glyph_index = FT_Get_Char_Index( face, *text);
392 if (use_kerning && previous && glyph_index){
393 FT_Vector delta;
394 FT_Get_Kerning( face, previous, glyph_index,
395 0, &delta );
396 text_width += (double)delta.x / 64.0;
398 }
399 error = FT_Load_Glyph( face, glyph_index, 0 );
400 if ( error ) break;
401 if (previous == 0){
402 pen_x -= (double)slot->metrics.horiBearingX / 64.0; /* adjust pos for first char */
403 text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
404 }
405 if ( text_height < (double)slot->metrics.horiBearingY / 64.0 ) {
406 text_height = (double)slot->metrics.horiBearingY / 64.0;
407 }
408 text_width += (double)slot->metrics.horiAdvance / 64.0;
409 }
410 text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */
411 text_width += (double)slot->metrics.width / 64.0; /* add just char width */
412 text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
414 switch(node->halign){
415 case GFX_H_RIGHT: pen_x -= text_width; break;
416 case GFX_H_CENTER: pen_x -= text_width / 2.0; break;
417 case GFX_H_LEFT: break;
418 case GFX_H_NULL: break;
419 }
421 switch(node->valign){
422 case GFX_V_TOP: pen_y += text_height; break;
423 case GFX_V_CENTER: pen_y += text_height / 2.0; break;
424 case GFX_V_BOTTOM: break;
425 case GFX_V_NULL: break;
426 }
428 glyph_index=0;
429 for(text=(unsigned char *)node->text;*text;text++) {
430 int gr;
431 previous = glyph_index;
432 glyph_index = FT_Get_Char_Index( face, *text);
434 if (use_kerning && previous && glyph_index){
435 FT_Vector delta;
436 FT_Get_Kerning( face, previous, glyph_index,
437 0, &delta );
438 pen_x += (double)delta.x / 64.0;
440 }
441 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_RENDER );
442 if ( error ) break;
443 gr = slot->bitmap.num_grays -1;
444 for (iy=0; iy < slot->bitmap.rows; iy++){
445 long buf_y = iy+(pen_y+0.5)-slot->bitmap_top;
446 if (buf_y < 0 || buf_y >= pys_height) continue;
447 buf_y *= rowstride;
448 for (ix=0;ix < slot->bitmap.width;ix++){
449 long buf_x = ix + (pen_x + 0.5) + (double)slot->bitmap_left ;
450 art_u8 font_alpha;
452 if (buf_x < 0 || buf_x >= pys_width) continue;
453 buf_x *= bytes_per_pixel ;
454 font_alpha = *(slot->bitmap.buffer + iy * slot->bitmap.width + ix);
455 font_alpha = (art_u8)((double)font_alpha / gr * falpha);
456 for (iz = 0; iz < 3; iz++){
457 art_u8 *orig = buffer + buf_y + buf_x + iz;
458 *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) +
459 (double)fcolor[iz] / gr * (font_alpha));
460 }
461 }
462 }
463 pen_x += (double)slot->metrics.horiAdvance / 64.0;
464 }
465 }
466 }
467 node = node->next;
468 }
469 gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
470 art_free(buffer);
471 FT_Done_FreeType( library );
472 return 0;
473 }
475 /* free memory used by nodes this will also remove memory required for
476 associated paths and svcs ... but not for text strings */
477 int
478 gfx_destroy (gfx_canvas_t *canvas){
479 gfx_node_t *next,*node = canvas->firstnode;
480 while(node){
481 next = node->next;
482 art_free(node->path);
483 art_free(node->svp);
484 free(node->text);
485 free(node->filename);
486 art_free(node);
487 node = next;
488 }
489 return 0;
490 }
492 static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){
493 png_structp png_ptr = NULL;
494 png_infop info_ptr = NULL;
495 int i;
496 png_bytep *row_pointers;
497 int rowstride = width * bytes_per_pixel;
498 png_text text[2];
500 if (fp == NULL)
501 return (1);
503 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
504 if (png_ptr == NULL)
505 {
506 return (1);
507 }
508 row_pointers = (png_bytepp)png_malloc(png_ptr,
509 height*sizeof(png_bytep));
511 info_ptr = png_create_info_struct(png_ptr);
513 if (info_ptr == NULL)
514 {
515 png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
516 return (1);
517 }
519 if (setjmp(png_jmpbuf(png_ptr)))
520 {
521 /* If we get here, we had a problem writing the file */
522 png_destroy_write_struct(&png_ptr, &info_ptr);
523 return (1);
524 }
526 png_init_io(png_ptr, fp);
527 png_set_IHDR (png_ptr, info_ptr,width, height,
528 8, PNG_COLOR_TYPE_RGB,
529 PNG_INTERLACE_NONE,
530 PNG_COMPRESSION_TYPE_DEFAULT,
531 PNG_FILTER_TYPE_DEFAULT);
533 text[0].key = "Software";
534 text[0].text = "RRDtool, Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch";
535 text[0].compression = PNG_TEXT_COMPRESSION_NONE;
536 png_set_text (png_ptr, info_ptr, text, 1);
538 /* Write header data */
539 png_write_info (png_ptr, info_ptr);
541 for (i = 0; i < height; i++)
542 row_pointers[i] = (png_bytep) (buffer + i*rowstride);
544 png_write_image(png_ptr, row_pointers);
545 png_write_end(png_ptr, info_ptr);
546 png_destroy_write_struct(&png_ptr, &info_ptr);
547 return 1;
548 }
551 /* ------- SVG -------
552 SVG reference:
553 http://www.w3.org/TR/SVG/
554 */
555 static int svg_indent = 0;
556 static int svg_single_line = 0;
557 static const char *svg_default_font = "Helvetica";
559 static void svg_print_indent(FILE *fp)
560 {
561 int i;
562 for (i = svg_indent - svg_single_line; i > 0; i--) {
563 putc(' ', fp);
564 putc(' ', fp);
565 }
566 }
568 static void svg_start_tag(FILE *fp, const char *name)
569 {
570 svg_print_indent(fp);
571 putc('<', fp);
572 fputs(name, fp);
573 svg_indent++;
574 }
576 static void svg_close_tag_single_line(FILE *fp)
577 {
578 svg_single_line++;
579 putc('>', fp);
580 }
582 static void svg_close_tag(FILE *fp)
583 {
584 putc('>', fp);
585 if (!svg_single_line)
586 putc('\n', fp);
587 }
589 static void svg_end_tag(FILE *fp, const char *name)
590 {
591 /* name is NULL if closing empty-node tag */
592 svg_indent--;
593 if (svg_single_line)
594 svg_single_line--;
595 else if (name)
596 svg_print_indent(fp);
597 if (name != NULL) {
598 fputs("</", fp);
599 fputs(name, fp);
600 } else {
601 putc('/', fp);
602 }
603 svg_close_tag(fp);
604 }
606 static void svg_close_tag_empty_node(FILE *fp)
607 {
608 svg_end_tag(fp, NULL);
609 }
611 static void svg_write_text(FILE *fp, const char *text)
612 {
613 const unsigned char *p, *start, *last;
614 unsigned int ch;
615 p = (const unsigned char*)text;
616 if (!p)
617 return;
618 /* trim leading spaces */
619 while (*p == ' ')
620 p++;
621 start = p;
622 /* trim trailing spaces */
623 last = p - 1;
624 while ((ch = *p) != 0) {
625 if (ch != ' ')
626 last = p;
627 p++;
628 }
629 /* encode trimmed text */
630 p = start;
631 while (p <= last) {
632 ch = *p++;
633 ch = afm_host2unicode(ch); /* unsafe macro */
634 switch (ch) {
635 case '&': fputs("&", fp); break;
636 case '<': fputs("<", fp); break;
637 case '>': fputs(">", fp); break;
638 case '"': fputs(""", fp); break;
639 default:
640 if (ch >= 127)
641 fprintf(fp, "&#%d;", ch);
642 else
643 putc(ch, fp);
644 }
645 }
646 }
648 static void svg_write_number(FILE *fp, double d)
649 {
650 /* omit decimals if integer to reduce filesize */
651 char buf[60], *p;
652 snprintf(buf, sizeof(buf), "%.2f", d);
653 p = buf; /* doesn't trust snprintf return value */
654 while (*p)
655 p++;
656 while (--p > buf) {
657 char ch = *p;
658 if (ch == '0') {
659 *p = '\0'; /* zap trailing zeros */
660 continue;
661 }
662 if (ch == '.')
663 *p = '\0'; /* zap trailing dot */
664 break;
665 }
666 fputs(buf, fp);
667 }
669 static int svg_color_is_black(int c)
670 {
671 /* gfx_color_t is RRGGBBAA */
672 return c == 0x000000FF;
673 }
675 static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
676 {
677 /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
678 gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
679 gfx_color_t opacity = c & 0xFF;
680 fprintf(fp, " %s=\"", attr);
681 if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
682 /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
683 fprintf(fp, "#%03lX",
684 ( ((rrggbb >> 8) & 0xF00)
685 | ((rrggbb >> 4) & 0x0F0)
686 | ( rrggbb & 0x00F)));
687 } else {
688 fprintf(fp, "#%06lX", rrggbb);
689 }
690 fputs("\"", fp);
691 if (opacity != 0xFF) {
692 fprintf(fp, " stroke-opacity=\"");
693 svg_write_number(fp, opacity / 255.0);
694 fputs("\"", fp);
695 }
696 }
698 static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
699 {
700 fputs(" stroke-width=\"", fp);
701 svg_write_number(fp, node->size);
702 fputs("\"", fp);
703 svg_write_color(fp, node->color, "stroke");
704 fputs(" fill=\"none\"", fp);
705 if (node->dash_on > 0 && node->dash_off > 0) {
706 fputs(" stroke-dasharray=\"", fp);
707 svg_write_number(fp, node->dash_on);
708 fputs(",", fp);
709 svg_write_number(fp, node->dash_off);
710 fputs("\"", fp);
711 }
712 }
714 static int svg_is_int_step(double a, double b)
715 {
716 double diff = fabs(a - b);
717 return floor(diff) == diff;
718 }
720 static int svg_path_straight_segment(FILE *fp,
721 double lastA, double currentA, double currentB,
722 gfx_node_t *node,
723 int segment_idx, int isx, char absChar, char relChar)
724 {
725 if (!svg_is_int_step(lastA, currentA)) {
726 putc(absChar, fp);
727 svg_write_number(fp, currentA);
728 return 0;
729 }
730 if (segment_idx < node->points - 1) {
731 ArtVpath *vec = node->path + segment_idx + 1;
732 if (vec->code == ART_LINETO) {
733 double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
734 double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
735 if (nextB == currentB
736 && ((currentA >= lastA) == (nextA >= currentA))
737 && svg_is_int_step(currentA, nextA)) {
738 return 1; /* skip to next as it is a straight line */
739 }
740 }
741 }
742 putc(relChar, fp);
743 svg_write_number(fp, currentA - lastA);
744 return 0;
745 }
747 static void svg_path(FILE *fp, gfx_node_t *node, int multi)
748 {
749 int i;
750 double lastX = 0, lastY = 0;
751 /* for straight lines <path..> tags take less space than
752 <line..> tags because of the efficient packing
753 in the 'd' attribute */
754 svg_start_tag(fp, "path");
755 if (!multi)
756 svg_common_path_attributes(fp, node);
757 fputs(" d=\"", fp);
758 /* specification of the 'd' attribute: */
759 /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
760 for (i = 0; i < node->points; i++) {
761 ArtVpath *vec = node->path + i;
762 double x = vec->x - LINEOFFSET;
763 double y = vec->y - LINEOFFSET;
764 switch (vec->code) {
765 case ART_MOVETO_OPEN: /* fall-through */
766 case ART_MOVETO:
767 putc('M', fp);
768 svg_write_number(fp, x);
769 putc(',', fp);
770 svg_write_number(fp, y);
771 break;
772 case ART_LINETO:
773 /* try optimize filesize by using minimal lineto commands */
774 /* without introducing rounding errors. */
775 if (x == lastX) {
776 if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
777 continue;
778 } else if (y == lastY) {
779 if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
780 continue;
781 } else {
782 putc('L', fp);
783 svg_write_number(fp, x);
784 putc(',', fp);
785 svg_write_number(fp, y);
786 }
787 break;
788 case ART_CURVETO: break; /* unsupported */
789 case ART_END: break; /* nop */
790 }
791 lastX = x;
792 lastY = y;
793 }
794 if (node->closed_path)
795 fputs(" Z", fp);
796 fputs("\"", fp);
797 svg_close_tag_empty_node(fp);
798 }
800 static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
801 {
802 /* optimize for multiple paths with the same color, penwidth, etc. */
803 int num = 1;
804 gfx_node_t *node = *nodeR;
805 gfx_node_t *next = node->next;
806 while (next) {
807 if (next->type != node->type
808 || next->size != node->size
809 || next->color != node->color
810 || next->dash_on != node->dash_on
811 || next->dash_off != node->dash_off)
812 break;
813 next = next->next;
814 num++;
815 }
816 if (num == 1) {
817 svg_path(fp, node, 0);
818 return;
819 }
820 svg_start_tag(fp, "g");
821 svg_common_path_attributes(fp, node);
822 svg_close_tag(fp);
823 while (num && node) {
824 svg_path(fp, node, 1);
825 if (!--num)
826 break;
827 node = node->next;
828 *nodeR = node;
829 }
830 svg_end_tag(fp, "g");
831 }
833 static void svg_area(FILE *fp, gfx_node_t *node)
834 {
835 int i;
836 double startX = 0, startY = 0;
837 svg_start_tag(fp, "polygon");
838 fputs(" ", fp);
839 svg_write_color(fp, node->color, "fill");
840 fputs(" points=\"", fp);
841 for (i = 0; i < node->points; i++) {
842 ArtVpath *vec = node->path + i;
843 double x = vec->x - LINEOFFSET;
844 double y = vec->y - LINEOFFSET;
845 switch (vec->code) {
846 case ART_MOVETO_OPEN: /* fall-through */
847 case ART_MOVETO:
848 svg_write_number(fp, x);
849 putc(',', fp);
850 svg_write_number(fp, y);
851 startX = x;
852 startY = y;
853 break;
854 case ART_LINETO:
855 if (i == node->points - 2
856 && node->path[i + 1].code == ART_END
857 && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
858 break; /* poly area always closed, no need for last point */
859 }
860 putc(' ', fp);
861 svg_write_number(fp, x);
862 putc(',', fp);
863 svg_write_number(fp, y);
864 break;
865 case ART_CURVETO: break; /* unsupported */
866 case ART_END: break; /* nop */
867 }
868 }
869 fputs("\"", fp);
870 svg_close_tag_empty_node(fp);
871 }
873 static void svg_text(FILE *fp, gfx_node_t *node)
874 {
875 double x = node->x - LINEOFFSET;
876 double y = node->y - LINEOFFSET;
877 if (node->angle != 0) {
878 svg_start_tag(fp, "g");
879 fputs(" transform=\"translate(", fp);
880 svg_write_number(fp, x);
881 fputs(",", fp);
882 svg_write_number(fp, y);
883 fputs(") rotate(", fp);
884 svg_write_number(fp, node->angle);
885 fputs(")\"", fp);
886 x = y = 0;
887 svg_close_tag(fp);
888 }
889 switch (node->valign) {
890 case GFX_V_TOP: y += node->size; break;
891 case GFX_V_CENTER: y += node->size / 2; break;
892 case GFX_V_BOTTOM: break;
893 case GFX_V_NULL: break;
894 }
895 svg_start_tag(fp, "text");
896 fputs(" x=\"", fp);
897 svg_write_number(fp, x);
898 fputs("\" y=\"", fp);
899 svg_write_number(fp, y);
900 if (strcmp(node->filename, svg_default_font))
901 fprintf(fp, " font-family=\"%s\"", node->filename);
902 fputs("\" font-size=\"", fp);
903 svg_write_number(fp, node->size);
904 fputs("\"", fp);
905 if (!svg_color_is_black(node->color))
906 svg_write_color(fp, node->color, "fill");
907 switch (node->halign) {
908 case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
909 case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
910 case GFX_H_LEFT: break;
911 case GFX_H_NULL: break;
912 }
913 svg_close_tag_single_line(fp);
914 /* support for node->tabwidth missing */
915 svg_write_text(fp, node->text);
916 svg_end_tag(fp, "text");
917 if (node->angle != 0)
918 svg_end_tag(fp, "g");
919 }
921 int gfx_render_svg (gfx_canvas_t *canvas,
922 art_u32 width, art_u32 height,
923 gfx_color_t background, FILE *fp){
924 gfx_node_t *node = canvas->firstnode;
925 fputs(
926 "<?xml version=\"1.0\" standalone=\"no\"?>\n"
927 "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
928 " \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
929 "<!--\n"
930 " SVG file created by RRDtool,\n"
931 " Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
932 "\n"
933 " The width/height attributes in the outhermost svg node\n"
934 " are just default sizes for the browser which is used\n"
935 " if the svg file is openened directly without being\n"
936 " embedded in an html file.\n"
937 " The viewBox is the local coord system for rrdtool.\n"
938 "-->\n", fp);
939 svg_start_tag(fp, "svg");
940 fputs(" width=\"", fp);
941 svg_write_number(fp, width * canvas->zoom);
942 fputs("\" height=\"", fp);
943 svg_write_number(fp, height * canvas->zoom);
944 fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
945 svg_write_number(fp, -LINEOFFSET);
946 fputs(" ", fp);
947 svg_write_number(fp, -LINEOFFSET);
948 fputs(" ", fp);
949 svg_write_number(fp, width - LINEOFFSET);
950 fputs(" ", fp);
951 svg_write_number(fp, height - LINEOFFSET);
952 fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
953 fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
954 fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
955 svg_close_tag(fp);
956 svg_start_tag(fp, "rect");
957 fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
958 svg_write_color(fp, background, "fill");
959 svg_close_tag_empty_node(fp);
960 while (node) {
961 switch (node->type) {
962 case GFX_LINE:
963 svg_multi_path(fp, &node);
964 break;
965 case GFX_AREA:
966 svg_area(fp, node);
967 break;
968 case GFX_TEXT:
969 svg_text(fp, node);
970 }
971 node = node->next;
972 }
973 svg_end_tag(fp, "svg");
974 return 0;
975 }
977 /* ------- EPS -------
978 EPS and Postscript references:
979 http://partners.adobe.com/asn/developer/technotes/postscript.html
980 */
982 typedef struct eps_font
983 {
984 const char *ps_font;
985 int id;
986 struct eps_font *next;
987 } eps_font;
989 typedef struct eps_state
990 {
991 FILE *fp;
992 gfx_canvas_t *canvas;
993 art_u32 page_width, page_height;
994 eps_font *font_list;
995 /*--*/
996 gfx_color_t color;
997 const char *font;
998 double font_size;
999 double line_width;
1000 int linecap, linejoin;
1001 } eps_state;
1003 static void eps_set_color(eps_state *state, gfx_color_t color)
1004 {
1005 /* gfx_color_t is RRGGBBAA */
1006 if (state->color == color)
1007 return;
1008 fprintf(state->fp, "%d %d %d Rgb\n",
1009 (int)((color >> 24) & 255),
1010 (int)((color >> 16) & 255),
1011 (int)((color >> 8) & 255));
1012 state->color = color;
1013 }
1015 static int eps_add_font(eps_state *state, gfx_node_t *node)
1016 {
1017 /* The fonts list could be postponed to the end using
1018 (atend), but let's be nice and have them in the header. */
1019 const char *ps_font = afm_get_font_postscript_name(node->filename);
1020 eps_font *ef;
1021 for (ef = state->font_list; ef; ef = ef->next) {
1022 if (!strcmp(ps_font, ef->ps_font))
1023 return 0;
1024 }
1025 ef = malloc(sizeof(eps_font));
1026 if (ef == NULL) {
1027 rrd_set_error("malloc for eps_font");
1028 return -1;
1029 }
1030 ef->next = state->font_list;
1031 ef->ps_font = ps_font;
1032 state->font_list = ef;
1033 return 0;
1034 }
1036 static void eps_list_fonts(eps_state *state, const char *dscName)
1037 {
1038 eps_font *ef;
1039 int lineLen = strlen(dscName);
1040 if (!state->font_list)
1041 return;
1042 fputs(dscName, state->fp);
1043 for (ef = state->font_list; ef; ef = ef->next) {
1044 int nameLen = strlen(ef->ps_font);
1045 if (lineLen + nameLen > 100 && lineLen) {
1046 fputs("\n", state->fp);
1047 fputs("%%- \n", state->fp);
1048 lineLen = 5;
1049 } else {
1050 fputs(" ", state->fp);
1051 lineLen++;
1052 }
1053 fputs(ef->ps_font, state->fp);
1054 lineLen += nameLen;
1055 }
1056 fputs("\n", state->fp);
1057 }
1059 static void eps_define_fonts(eps_state *state)
1060 {
1061 eps_font *ef;
1062 if (!state->font_list)
1063 return;
1064 for (ef = state->font_list; ef; ef = ef->next) {
1065 /* PostScript¨ LANGUAGE REFERENCE third edition
1066 page 349 */
1067 fprintf(state->fp,
1068 "%%\n"
1069 "/%s findfont dup length dict begin\n"
1070 "{ 1 index /FID ne {def} {pop pop} ifelse } forall\n"
1071 "/Encoding ISOLatin1Encoding def\n"
1072 "currentdict end\n"
1073 "/%s-ISOLatin1 exch definefont pop\n"
1074 "/SetFont-%s { /%s-ISOLatin1 findfont exch scalefont setfont } bd\n",
1075 ef->ps_font, ef->ps_font, ef->ps_font, ef->ps_font);
1076 }
1077 }
1079 static int eps_prologue(eps_state *state)
1080 {
1081 gfx_node_t *node;
1082 fputs(
1083 "%!PS-Adobe-3.0 EPSF-3.0\n"
1084 "%%Creator: RRDtool 1.1.x, Tobias Oetiker, http://tobi.oetiker.ch\n"
1085 /* can't like weird chars here */
1086 "%%Title: (RRDTool output)\n"
1087 "%%DocumentData: Clean7Bit\n"
1088 "", state->fp);
1089 fprintf(state->fp, "%%%%BoundingBox: 0 0 %d %d\n",
1090 state->page_width, state->page_height);
1091 for (node = state->canvas->firstnode; node; node = node->next) {
1092 if (node->type == GFX_TEXT && eps_add_font(state, node) == -1)
1093 return -1;
1094 }
1095 eps_list_fonts(state, "%%DocumentFonts:");
1096 eps_list_fonts(state, "%%DocumentNeededFonts:");
1097 fputs(
1098 "%%EndComments\n"
1099 "%%BeginProlog\n"
1100 "%%EndProlog\n" /* must have, or BoundingBox is ignored */
1101 "/bd { bind def } bind def\n"
1102 "", state->fp);
1103 fprintf(state->fp, "/X { %.2f add } bd\n", LINEOFFSET);
1104 fputs(
1105 "/X2 {X exch X exch} bd\n"
1106 "/M {X2 moveto} bd\n"
1107 "/L {X2 lineto} bd\n"
1108 "/m {moveto} bd\n"
1109 "/l {lineto} bd\n"
1110 "/S {stroke} bd\n"
1111 "/CP {closepath} bd\n"
1112 "/WS {setlinewidth stroke} bd\n"
1113 "/F {fill} bd\n"
1114 "/TaL { } bd\n"
1115 "/TaC {dup stringwidth pop neg 2 div 0 rmoveto } bd\n"
1116 "/TaR {dup stringwidth pop neg 0 rmoveto } bd\n"
1117 "/TL {moveto TaL show} bd\n"
1118 "/TC {moveto TaC show} bd\n"
1119 "/TR {moveto TaR show} bd\n"
1120 "/Rgb { 255.0 div 3 1 roll\n"
1121 " 255.0 div 3 1 roll \n"
1122 " 255.0 div 3 1 roll setrgbcolor } bd\n"
1123 "", state->fp);
1124 eps_define_fonts(state);
1125 return 0;
1126 }
1128 static void eps_write_linearea(eps_state *state, gfx_node_t *node)
1129 {
1130 int i;
1131 FILE *fp = state->fp;
1132 int useOffset = 0;
1133 eps_set_color(state, node->color);
1134 if (node->type == GFX_LINE) {
1135 if (state->linecap != 1) {
1136 fputs("1 setlinecap\n", fp);
1137 state->linecap = 1;
1138 }
1139 if (state->linejoin != 1) {
1140 fputs("1 setlinejoin\n", fp);
1141 state->linejoin = 1;
1142 }
1143 }
1144 for (i = 0; i < node->points; i++) {
1145 ArtVpath *vec = node->path + i;
1146 double x = vec->x;
1147 double y = state->page_height - vec->y;
1148 if (vec->code == ART_MOVETO_OPEN || vec->code == ART_MOVETO)
1149 useOffset = (fabs(x - floor(x) - 0.5) < 0.01 && fabs(y - floor(y) - 0.5) < 0.01);
1150 if (useOffset) {
1151 x -= LINEOFFSET;
1152 y -= LINEOFFSET;
1153 }
1154 switch (vec->code) {
1155 case ART_MOVETO_OPEN: /* fall-through */
1156 case ART_MOVETO:
1157 svg_write_number(fp, x);
1158 fputc(' ', fp);
1159 svg_write_number(fp, y);
1160 fputc(' ', fp);
1161 fputs(useOffset ? "M\n" : "m\n", fp);
1162 break;
1163 case ART_LINETO:
1164 svg_write_number(fp, x);
1165 fputc(' ', fp);
1166 svg_write_number(fp, y);
1167 fputc(' ', fp);
1168 fputs(useOffset ? "L\n" : "l\n", fp);
1169 break;
1170 case ART_CURVETO: break; /* unsupported */
1171 case ART_END: break; /* nop */
1172 }
1173 }
1174 if (node->type == GFX_LINE) {
1175 if (node->closed_path)
1176 fputs("CP ", fp);
1177 if (node->size != state->line_width) {
1178 state->line_width = node->size;
1179 svg_write_number(fp, state->line_width);
1180 fputs(" WS\n", fp);
1181 } else {
1182 fputs("S\n", fp);
1183 }
1184 } else {
1185 fputs("F\n", fp);
1186 }
1187 }
1189 static void eps_write_text(eps_state *state, gfx_node_t *node)
1190 {
1191 FILE *fp = state->fp;
1192 const unsigned char *p;
1193 const char *ps_font = afm_get_font_postscript_name(node->filename);
1194 char align = 'L';
1195 double x = node->x;
1196 double y = state->page_height - node->y, ydelta = 0;
1197 int lineLen = 0;
1198 eps_set_color(state, node->color);
1199 if (strcmp(ps_font, state->font) || node->size != state->font_size) {
1200 state->font = ps_font;
1201 state->font_size = node->size;
1202 svg_write_number(fp, state->font_size);
1203 fprintf(fp, " SetFont-%s\n", state->font);
1204 }
1205 fputs("(", fp);
1206 lineLen = 20;
1207 for (p = (const unsigned char*)node->text; *p; p++) {
1208 if (lineLen > 70) {
1209 fputs("\\\n", fp); /* backslash and \n */
1210 lineLen = 0;
1211 }
1212 switch (*p) {
1213 case '(':
1214 case ')':
1215 case '\\':
1216 case '\n':
1217 case '\r':
1218 case '\t':
1219 fputc('\\', fp);
1220 lineLen++;
1221 /* fall-through */
1222 default:
1223 if (*p >= 126)
1224 fprintf(fp, "\\%03o", *p);
1225 else
1226 fputc(*p, fp);
1227 lineLen++;
1228 }
1229 }
1230 fputs(") ", fp);
1231 switch(node->valign){
1232 case GFX_V_TOP: ydelta = -node->size; break;
1233 case GFX_V_CENTER: ydelta = -node->size / 3.0; break;
1234 case GFX_V_BOTTOM: break;
1235 case GFX_V_NULL: break;
1236 }
1237 if (node->angle == 0)
1238 y += ydelta;
1239 switch (node->halign) {
1240 case GFX_H_RIGHT: align = 'R'; break;
1241 case GFX_H_CENTER: align = 'C'; break;
1242 case GFX_H_LEFT: align= 'L'; break;
1243 case GFX_H_NULL: align= 'L'; break;
1244 }
1245 if (node->angle != 0) {
1246 fputs("\n", fp);
1247 fputs(" gsave ", fp);
1248 svg_write_number(fp, x);
1249 fputc(' ', fp);
1250 svg_write_number(fp, y);
1251 fputs(" translate ", fp);
1252 svg_write_number(fp, -node->angle);
1253 fputs(" rotate 0 ", fp);
1254 svg_write_number(fp, ydelta);
1255 fputs(" moveto ", fp);
1256 fprintf(fp, "Ta%c", align);
1257 fputs(" show grestore\n", fp);
1258 } else {
1259 svg_write_number(fp, x);
1260 fputc(' ', fp);
1261 svg_write_number(fp, y);
1262 fputs(" T", fp);
1263 fputc(align, fp);
1264 fputc('\n', fp);
1265 }
1266 }
1268 static int eps_write_content(eps_state *state)
1269 {
1270 gfx_node_t *node;
1271 fputs("%\n", state->fp);
1272 for (node = state->canvas->firstnode; node; node = node->next) {
1273 switch (node->type) {
1274 case GFX_LINE:
1275 case GFX_AREA:
1276 eps_write_linearea(state, node);
1277 break;
1278 case GFX_TEXT:
1279 eps_write_text(state, node);
1280 break;
1281 }
1282 }
1283 return 0;
1284 }
1286 int gfx_render_eps (gfx_canvas_t *canvas,
1287 art_u32 width, art_u32 height,
1288 gfx_color_t background, FILE *fp){
1289 struct eps_state state;
1290 state.fp = fp;
1291 state.canvas = canvas;
1292 state.page_width = width;
1293 state.page_height = height;
1294 state.font = "no-default-font";
1295 state.font_size = -1;
1296 state.color = 0; /* black */
1297 state.font_list = NULL;
1298 state.linecap = -1;
1299 state.linejoin = -1;
1300 if (eps_prologue(&state) == -1)
1301 return -1;
1302 eps_set_color(&state, background);
1303 fprintf(fp, "0 0 M 0 %d L %d %d L %d 0 L fill\n",
1304 height, width, height, width);
1305 if (eps_write_content(&state) == -1)
1306 return 0;
1307 fputs("showpage\n", fp);
1308 fputs("%%EOF\n", fp);
1309 while (state.font_list) {
1310 eps_font *next = state.font_list->next;
1311 free(state.font_list);
1312 state.font_list = next;
1313 }
1314 return 0;
1315 }