#include <png.h>
#include <ft2build.h>
#include FT_FREETYPE_H
+#include <math.h>
#include "rrd_gfx.h"
node->path = NULL; /* path */
node->points = 0;
node->points_max =0;
+ node->closed_path = 0;
node->svp = NULL; /* svp */
node->filename = NULL; /* font or image filename */
node->text = NULL;
node->x = 0.0;
node->y = 0.0; /* position */
+ node->angle = 0;
node->halign = GFX_H_NULL; /* text alignement */
node->valign = GFX_V_NULL; /* text alignement */
node->tabwidth = 0.0;
gfx_canvas_t *canvas = art_new(gfx_canvas_t,1);
canvas->firstnode = NULL;
canvas->lastnode = NULL;
+ canvas->imgformat = IF_PNG; /* we default to PNG output */
+ canvas->interlaced = 0;
+ canvas->zoom = 1.0;
return canvas;
}
double x0, double y0,
double x1, double y1,
double width, gfx_color_t color){
+ return gfx_new_dashed_line(canvas, x0, y0, x1, y1, width, color, 0, 0);
+}
+
+gfx_node_t *gfx_new_dashed_line(gfx_canvas_t *canvas,
+ double x0, double y0,
+ double x1, double y1,
+ double width, gfx_color_t color,
+ double dash_on, double dash_off){
gfx_node_t *node;
ArtVpath *vec;
node->points_max = 3;
node->color = color;
node->size = width;
+ node->dash_on = dash_on;
+ node->dash_off = dash_off;
node->path = vec;
return node;
}
return 0;
}
-
+void gfx_close_path (gfx_node_t *node) {
+ node->closed_path = 1;
+}
/* create a text node */
gfx_node_t *gfx_new_text (gfx_canvas_t *canvas,
node->filename = strdup(font);
node->x = x;
node->y = y;
+ node->angle = angle;
node->color = color;
node->tabwidth = tabwidth;
node->halign = h_align;
return node;
}
-double gfx_get_text_width ( double start, char* font, double size,
+int gfx_render(gfx_canvas_t *canvas,
+ art_u32 width, art_u32 height,
+ gfx_color_t background, FILE *fp){
+ switch (canvas->imgformat) {
+ case IF_PNG:
+ return gfx_render_png (canvas, width, height, background, fp);
+ case IF_SVG:
+ return gfx_render_svg (canvas, width, height, background, fp);
+ default:
+ return -1;
+ }
+}
+
+double gfx_get_text_width ( gfx_canvas_t *canvas,
+ double start, char* font, double size,
+ double tabwidth, char* text){
+ switch (canvas->imgformat) {
+ case IF_PNG:
+ return gfx_get_text_width_libart (canvas, start, font, size, tabwidth, text);
+ default:
+ return size * strlen(text);
+ }
+}
+
+double gfx_get_text_width_libart ( gfx_canvas_t *canvas,
+ double start, char* font, double size,
double tabwidth, char* text){
FT_GlyphSlot slot;
}
error = FT_Load_Glyph( face, glyph_index, 0 );
+ if ( error ) {
+ FT_Done_FreeType(library);
+ return -1;
+ }
if (! previous) {
text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
}
text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */
text_width += (double)slot->metrics.width / 64.0; /* add just char width */
text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
+ FT_Done_FreeType(library);
return text_width;
}
/* render grafics into png image */
int gfx_render_png (gfx_canvas_t *canvas,
art_u32 width, art_u32 height,
- double zoom,
gfx_color_t background, FILE *fp){
gfx_node_t *node = canvas->firstnode;
art_u8 red = background >> 24, green = (background >> 16) & 0xff;
art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff );
- unsigned long pys_width = width * zoom;
- unsigned long pys_height = height * zoom;
+ unsigned long pys_width = width * canvas->zoom;
+ unsigned long pys_height = height * canvas->zoom;
const int bytes_per_pixel = 3;
unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */
art_u8 *buffer = art_new (art_u8, rowstride*pys_height);
ArtVpath *vec;
double dst[6];
ArtSVP *svp;
- art_affine_scale(dst,zoom,zoom);
+ if (node->closed_path) {
+ /* libart uses end==start for closed as indicator of closed path */
+ gfx_add_point(node, node->path[0].x, node->path[0].y);
+ node->closed_path = 0;
+ }
+ art_affine_scale(dst,canvas->zoom,canvas->zoom);
vec = art_vpath_affine_transform(node->path,dst);
if(node->type == GFX_LINE){
svp = art_svp_vpath_stroke ( vec, ART_PATH_STROKE_JOIN_ROUND,
ART_PATH_STROKE_CAP_ROUND,
- node->size*zoom,1,1);
+ node->size*canvas->zoom,1,1);
} else {
svp = art_svp_from_vpath ( vec );
}
(char *)node->filename,
0,
&face );
+ if ( error ) break;
use_kerning = FT_HAS_KERNING(face);
- if ( error ) break;
error = FT_Set_Char_Size(face, /* handle to face object */
(long)(node->size*64),
(long)(node->size*64),
- (long)(100*zoom),
- (long)(100*zoom));
- pen_x = node->x * zoom;
- pen_y = node->y * zoom;
+ (long)(100*canvas->zoom),
+ (long)(100*canvas->zoom));
+ if ( error ) break;
+ pen_x = node->x * canvas->zoom;
+ pen_y = node->y * canvas->zoom;
slot = face->glyph;
for(text=(unsigned char *)node->text;*text;text++) {
}
error = FT_Load_Glyph( face, glyph_index, 0 );
+ if ( error ) break;
if (previous == 0){
pen_x -= (double)slot->metrics.horiBearingX / 64.0; /* adjust pos for first char */
text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */
}
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_RENDER );
+ if ( error ) break;
gr = slot->bitmap.num_grays -1;
for (iy=0; iy < slot->bitmap.rows; iy++){
long buf_y = iy+(pen_y+0.5)-slot->bitmap_top;
}
gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel);
art_free(buffer);
+ FT_Done_FreeType( library );
return 0;
}
png_destroy_write_struct(&png_ptr, &info_ptr);
return 1;
}
+
+
+/* ------- SVG -------
+ SVG reference:
+ http://www.w3.org/TR/SVG/
+*/
+static int svg_indent = 0;
+static int svg_single_line = 0;
+static const char *svg_default_font = "Helvetica";
+
+static void svg_print_indent(FILE *fp)
+{
+ int i;
+ for (i = svg_indent - svg_single_line; i > 0; i--) {
+ putc(' ', fp);
+ putc(' ', fp);
+ }
+}
+
+static void svg_start_tag(FILE *fp, const char *name)
+{
+ svg_print_indent(fp);
+ putc('<', fp);
+ fputs(name, fp);
+ svg_indent++;
+}
+
+static void svg_close_tag_single_line(FILE *fp)
+{
+ svg_single_line++;
+ putc('>', fp);
+}
+
+static void svg_close_tag(FILE *fp)
+{
+ putc('>', fp);
+ if (!svg_single_line)
+ putc('\n', fp);
+}
+
+static void svg_end_tag(FILE *fp, const char *name)
+{
+ /* name is NULL if closing empty-node tag */
+ svg_indent--;
+ if (svg_single_line)
+ svg_single_line--;
+ else if (name)
+ svg_print_indent(fp);
+ if (name != NULL) {
+ fputs("</", fp);
+ fputs(name, fp);
+ } else {
+ putc('/', fp);
+ }
+ svg_close_tag(fp);
+}
+
+static void svg_close_tag_empty_node(FILE *fp)
+{
+ svg_end_tag(fp, NULL);
+}
+
+static void svg_write_text(FILE *fp, const char *p)
+{
+ char ch;
+ const char *start, *last;
+ if (!p)
+ return;
+ /* trim leading spaces */
+ while (*p == ' ')
+ p++;
+ start = p;
+ /* trim trailing spaces */
+ last = p - 1;
+ while ((ch = *p) != 0) {
+ if (ch != ' ')
+ last = p;
+ p++;
+ }
+ /* encode trimmed text */
+ p = start;
+ while (p <= last) {
+ ch = *p++;
+ switch (ch) {
+ case '&': fputs("&", fp); break;
+ case '<': fputs("<", fp); break;
+ case '>': fputs(">", fp); break;
+ case '"': fputs(""", fp); break;
+ default: putc(ch, fp);
+ }
+ }
+}
+
+static void svg_write_number(FILE *fp, double d)
+{
+ /* omit decimals if integer to reduce filesize */
+ char buf[60], *p;
+ snprintf(buf, sizeof(buf), "%.2f", d);
+ p = buf; /* doesn't trust snprintf return value */
+ while (*p)
+ p++;
+ while (--p > buf) {
+ char ch = *p;
+ if (ch == '0') {
+ *p = '\0'; /* zap trailing zeros */
+ continue;
+ }
+ if (ch == '.')
+ *p = '\0'; /* zap trailing dot */
+ break;
+ }
+ fputs(buf, fp);
+}
+
+static int svg_color_is_black(int c)
+{
+ /* gfx_color_t is RRGGBBAA */
+ return c == 0x000000FF;
+}
+
+static void svg_write_color(FILE *fp, gfx_color_t c, const char *attr)
+{
+ /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB and #RGB like html */
+ gfx_color_t rrggbb = (int)((c >> 8) & 0xFFFFFF);
+ gfx_color_t opacity = c & 0xFF;
+ fprintf(fp, " %s=\"", attr);
+ if ((rrggbb & 0x0F0F0F) == ((rrggbb >> 4) & 0x0F0F0F)) {
+ /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
+ fprintf(fp, "#%03lX",
+ ( ((rrggbb >> 8) & 0xF00)
+ | ((rrggbb >> 4) & 0x0F0)
+ | ( rrggbb & 0x00F)));
+ } else {
+ fprintf(fp, "#%06lX", rrggbb);
+ }
+ fputs("\"", fp);
+ if (opacity != 0xFF) {
+ fprintf(fp, " stroke-opacity=\"");
+ svg_write_number(fp, opacity / 255.0);
+ fputs("\"", fp);
+ }
+}
+
+static void svg_common_path_attributes(FILE *fp, gfx_node_t *node)
+{
+ fputs(" stroke-width=\"", fp);
+ svg_write_number(fp, node->size);
+ fputs("\"", fp);
+ svg_write_color(fp, node->color, "stroke");
+ fputs(" fill=\"none\"", fp);
+ if (node->dash_on != 0 && node->dash_off != 0) {
+ fputs(" stroke-dasharray=\"", fp);
+ svg_write_number(fp, node->dash_on);
+ fputs(",", fp);
+ svg_write_number(fp, node->dash_off);
+ fputs("\"", fp);
+ }
+}
+
+static int svg_is_int_step(double a, double b)
+{
+ double diff = fabs(a - b);
+ return floor(diff) == diff;
+}
+
+static int svg_path_straight_segment(FILE *fp,
+ double lastA, double currentA, double currentB,
+ gfx_node_t *node,
+ int segment_idx, int isx, char absChar, char relChar)
+{
+ if (!svg_is_int_step(lastA, currentA)) {
+ putc(absChar, fp);
+ svg_write_number(fp, currentA);
+ return 0;
+ }
+ if (segment_idx < node->points - 1) {
+ ArtVpath *vec = node->path + segment_idx + 1;
+ if (vec->code == ART_LINETO) {
+ double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
+ double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
+ if (nextB == currentB
+ && ((currentA >= lastA) == (nextA >= currentA))
+ && svg_is_int_step(currentA, nextA)) {
+ return 1; /* skip to next as it is a straight line */
+ }
+ }
+ }
+ putc(relChar, fp);
+ svg_write_number(fp, currentA - lastA);
+ return 0;
+}
+
+static void svg_path(FILE *fp, gfx_node_t *node, int multi)
+{
+ int i;
+ double lastX = 0, lastY = 0;
+ /* for straight lines <path..> tags take less space than
+ <line..> tags because of the efficient packing
+ in the 'd' attribute */
+ svg_start_tag(fp, "path");
+ if (!multi)
+ svg_common_path_attributes(fp, node);
+ fputs(" d=\"", fp);
+ /* specification of the 'd' attribute: */
+ /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
+ for (i = 0; i < node->points; i++) {
+ ArtVpath *vec = node->path + i;
+ double x = vec->x - LINEOFFSET;
+ double y = vec->y - LINEOFFSET;
+ switch (vec->code) {
+ case ART_MOVETO_OPEN: /* fall-through */
+ case ART_MOVETO:
+ putc('M', fp);
+ svg_write_number(fp, x);
+ putc(',', fp);
+ svg_write_number(fp, y);
+ break;
+ case ART_LINETO:
+ /* try optimize filesize by using minimal lineto commands */
+ /* without introducing rounding errors. */
+ if (x == lastX) {
+ if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
+ continue;
+ } else if (y == lastY) {
+ if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
+ continue;
+ } else {
+ putc('L', fp);
+ svg_write_number(fp, x);
+ putc(',', fp);
+ svg_write_number(fp, y);
+ }
+ break;
+ case ART_CURVETO: break; /* unsupported */
+ case ART_END: break; /* nop */
+ }
+ lastX = x;
+ lastY = y;
+ }
+ if (node->closed_path)
+ fputs(" Z", fp);
+ fputs("\"", fp);
+ svg_close_tag_empty_node(fp);
+}
+
+static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
+{
+ /* optimize for multiple paths with the same color, penwidth, etc. */
+ int num = 1;
+ gfx_node_t *node = *nodeR;
+ gfx_node_t *next = node->next;
+ while (next) {
+ if (next->type != node->type
+ || next->size != node->size
+ || next->color != node->color
+ || next->dash_on != node->dash_on
+ || next->dash_off != node->dash_off)
+ break;
+ next = next->next;
+ num++;
+ }
+ if (num == 1) {
+ svg_path(fp, node, 0);
+ return;
+ }
+ svg_start_tag(fp, "g");
+ svg_common_path_attributes(fp, node);
+ svg_close_tag(fp);
+ while (num && node) {
+ svg_path(fp, node, 1);
+ if (!--num)
+ break;
+ node = node->next;
+ *nodeR = node;
+ }
+ svg_end_tag(fp, "g");
+}
+
+static void svg_area(FILE *fp, gfx_node_t *node)
+{
+ int i;
+ double startX = 0, startY = 0;
+ svg_start_tag(fp, "polygon");
+ fputs(" ", fp);
+ svg_write_color(fp, node->color, "fill");
+ fputs(" points=\"", fp);
+ for (i = 0; i < node->points; i++) {
+ ArtVpath *vec = node->path + i;
+ double x = vec->x - LINEOFFSET;
+ double y = vec->y - LINEOFFSET;
+ switch (vec->code) {
+ case ART_MOVETO_OPEN: /* fall-through */
+ case ART_MOVETO:
+ svg_write_number(fp, x);
+ putc(',', fp);
+ svg_write_number(fp, y);
+ startX = x;
+ startY = y;
+ break;
+ case ART_LINETO:
+ if (i == node->points - 2
+ && node->path[i + 1].code == ART_END
+ && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
+ break; /* poly area always closed, no need for last point */
+ }
+ putc(' ', fp);
+ svg_write_number(fp, x);
+ putc(',', fp);
+ svg_write_number(fp, y);
+ break;
+ case ART_CURVETO: break; /* unsupported */
+ case ART_END: break; /* nop */
+ }
+ }
+ fputs("\"", fp);
+ svg_close_tag_empty_node(fp);
+}
+
+static void svg_text(FILE *fp, gfx_node_t *node)
+{
+ double x = node->x - LINEOFFSET;
+ double y = node->y - LINEOFFSET;
+ if (node->angle != 0) {
+ svg_start_tag(fp, "g");
+ fputs(" transform=\"translate(", fp);
+ svg_write_number(fp, x);
+ fputs(",", fp);
+ svg_write_number(fp, y);
+ fputs(") rotate(", fp);
+ svg_write_number(fp, node->angle);
+ fputs(")\"", fp);
+ x = y = 0;
+ svg_close_tag(fp);
+ }
+ switch (node->valign) {
+ case GFX_V_TOP: y += node->size; break;
+ case GFX_V_CENTER: y += node->size / 2; break;
+ case GFX_V_BOTTOM: break;
+ case GFX_V_NULL: break;
+ }
+ svg_start_tag(fp, "text");
+ fputs(" x=\"", fp);
+ svg_write_number(fp, x);
+ fputs("\" y=\"", fp);
+ svg_write_number(fp, y);
+ if (strcmp(node->filename, svg_default_font))
+ fprintf(fp, " font-family=\"%s\"", node->filename);
+ fputs("\" font-size=\"", fp);
+ svg_write_number(fp, node->size);
+ fputs("\"", fp);
+ if (!svg_color_is_black(node->color))
+ svg_write_color(fp, node->color, "fill");
+ switch (node->halign) {
+ case GFX_H_RIGHT: fputs(" text-anchor=\"end\"", fp); break;
+ case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
+ case GFX_H_LEFT: break;
+ case GFX_H_NULL: break;
+ }
+ svg_close_tag_single_line(fp);
+ /* support for node->tabwidth missing */
+ svg_write_text(fp, node->text);
+ svg_end_tag(fp, "text");
+ if (node->angle != 0)
+ svg_end_tag(fp, "g");
+}
+
+int gfx_render_svg (gfx_canvas_t *canvas,
+ art_u32 width, art_u32 height,
+ gfx_color_t background, FILE *fp){
+ gfx_node_t *node = canvas->firstnode;
+ fputs(
+"<?xml version=\"1.0\" standalone=\"no\"?>\n"
+"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
+" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
+"<!--\n"
+" SVG file created by RRDtool,\n"
+" Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
+"\n"
+" The width/height attributes in the outhermost svg node\n"
+" are just default sizes for the browser which is used\n"
+" if the svg file is openened directly without being\n"
+" embedded in an html file.\n"
+" The viewBox is the local coord system for rrdtool.\n"
+"-->\n", fp);
+ svg_start_tag(fp, "svg");
+ fputs(" width=\"", fp);
+ svg_write_number(fp, width * canvas->zoom);
+ fputs("\" height=\"", fp);
+ svg_write_number(fp, height * canvas->zoom);
+ fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
+ svg_write_number(fp, -LINEOFFSET);
+ fputs(" ", fp);
+ svg_write_number(fp, -LINEOFFSET);
+ fputs(" ", fp);
+ svg_write_number(fp, width - LINEOFFSET);
+ fputs(" ", fp);
+ svg_write_number(fp, height - LINEOFFSET);
+ fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
+ fprintf(fp, " font-family=\"%s\"", svg_default_font); /* default font */
+ fputs(" stroke-linecap=\"round\" stroke-linejoin=\"round\"", fp);
+ svg_close_tag(fp);
+ svg_start_tag(fp, "rect");
+ fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
+ svg_write_color(fp, background, "fill");
+ svg_close_tag_empty_node(fp);
+ while (node) {
+ switch (node->type) {
+ case GFX_LINE:
+ svg_multi_path(fp, &node);
+ break;
+ case GFX_AREA:
+ svg_area(fp, node);
+ break;
+ case GFX_TEXT:
+ svg_text(fp, node);
+ }
+ node = node->next;
+ }
+ svg_end_tag(fp, "svg");
+ return 0;
+}
projects / rrdtool.git / blobdiff