From 15cdb30e3125ce542289fe385f559799e5abf220 Mon Sep 17 00:00:00 2001 From: John Mark Bell Date: Mon, 24 Aug 2009 08:06:29 +0000 Subject: Beginnings of port to core buildsystem svn path=/trunk/libsvgtiny/; revision=9419 --- src/svgtiny.c | 1079 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1079 insertions(+) create mode 100644 src/svgtiny.c (limited to 'src/svgtiny.c') diff --git a/src/svgtiny.c b/src/svgtiny.c new file mode 100644 index 0000000..ab6b6dd --- /dev/null +++ b/src/svgtiny.c @@ -0,0 +1,1079 @@ +/* + * This file is part of Libsvgtiny + * Licensed under the MIT License, + * http://opensource.org/licenses/mit-license.php + * Copyright 2008 James Bursa + */ + +#define _GNU_SOURCE /* for strndup */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "svgtiny.h" +#include "svgtiny_internal.h" + + +static svgtiny_code svgtiny_parse_svg(xmlNode *svg, + struct svgtiny_parse_state state); +static svgtiny_code svgtiny_parse_path(xmlNode *path, + struct svgtiny_parse_state state); +static svgtiny_code svgtiny_parse_rect(xmlNode *rect, + struct svgtiny_parse_state state); +static svgtiny_code svgtiny_parse_circle(xmlNode *circle, + struct svgtiny_parse_state state); +static svgtiny_code svgtiny_parse_line(xmlNode *line, + struct svgtiny_parse_state state); +static svgtiny_code svgtiny_parse_poly(xmlNode *poly, + struct svgtiny_parse_state state, bool polygon); +static svgtiny_code svgtiny_parse_text(xmlNode *text, + struct svgtiny_parse_state state); +static void svgtiny_parse_position_attributes(const xmlNode *node, + const struct svgtiny_parse_state state, + float *x, float *y, float *width, float *height); +static void svgtiny_parse_paint_attributes(const xmlNode *node, + struct svgtiny_parse_state *state); +static void svgtiny_parse_font_attributes(const xmlNode *node, + struct svgtiny_parse_state *state); +static void svgtiny_parse_transform_attributes(xmlNode *node, + struct svgtiny_parse_state *state); +static svgtiny_code svgtiny_add_path(float *p, unsigned int n, + struct svgtiny_parse_state *state); + + +/** + * Create a new svgtiny_diagram structure. + */ + +struct svgtiny_diagram *svgtiny_create(void) +{ + struct svgtiny_diagram *diagram; + + diagram = malloc(sizeof *diagram); + if (!diagram) + return 0; + + diagram->shape = 0; + diagram->shape_count = 0; + diagram->error_line = 0; + diagram->error_message = 0; + + return diagram; +} + + +/** + * Parse a block of memory into a svgtiny_diagram. + */ + +svgtiny_code svgtiny_parse(struct svgtiny_diagram *diagram, + const char *buffer, size_t size, const char *url, + int viewport_width, int viewport_height) +{ + xmlDoc *document; + xmlNode *svg; + struct svgtiny_parse_state state; + float x, y, width, height; + svgtiny_code code; + + assert(diagram); + assert(buffer); + assert(url); + + /* parse XML to tree */ + document = xmlReadMemory(buffer, size, url, 0, + XML_PARSE_NONET | XML_PARSE_COMPACT); + if (!document) + return svgtiny_LIBXML_ERROR; + + /*xmlDebugDumpDocument(stderr, document);*/ + + /* find root element */ + svg = xmlDocGetRootElement(document); + if (!svg) + return svgtiny_NOT_SVG; + if (strcmp((const char *) svg->name, "svg") != 0) + return svgtiny_NOT_SVG; + + /* get graphic dimensions */ + state.diagram = diagram; + state.document = document; + state.viewport_width = viewport_width; + state.viewport_height = viewport_height; + svgtiny_parse_position_attributes(svg, state, &x, &y, &width, &height); + diagram->width = width; + diagram->height = height; + + /* set up parsing state */ + state.viewport_width = width; + state.viewport_height = height; + state.ctm.a = 1; /*(float) viewport_width / (float) width;*/ + state.ctm.b = 0; + state.ctm.c = 0; + state.ctm.d = 1; /*(float) viewport_height / (float) height;*/ + state.ctm.e = 0; /*x;*/ + state.ctm.f = 0; /*y;*/ + /*state.style = css_base_style; + state.style.font_size.value.length.value = option_font_size * 0.1;*/ + state.fill = 0x000000; + state.stroke = svgtiny_TRANSPARENT; + state.stroke_width = 1; + state.linear_gradient_stop_count = 0; + + /* parse tree */ + code = svgtiny_parse_svg(svg, state); + + /* free XML tree */ + xmlFreeDoc(document); + + return code; +} + + +/** + * Parse a or element node. + */ + +svgtiny_code svgtiny_parse_svg(xmlNode *svg, + struct svgtiny_parse_state state) +{ + float x, y, width, height; + + svgtiny_parse_position_attributes(svg, state, &x, &y, &width, &height); + svgtiny_parse_paint_attributes(svg, &state); + svgtiny_parse_font_attributes(svg, &state); + + /* parse viewBox */ + xmlAttr *view_box = xmlHasProp(svg, (const xmlChar *) "viewBox"); + if (view_box) { + const char *s = (const char *) view_box->children->content; + float min_x, min_y, vwidth, vheight; + if (sscanf(s, "%f,%f,%f,%f", + &min_x, &min_y, &vwidth, &vheight) == 4 || + sscanf(s, "%f %f %f %f", + &min_x, &min_y, &vwidth, &vheight) == 4) { + state.ctm.a = (float) state.viewport_width / vwidth; + state.ctm.d = (float) state.viewport_height / vheight; + state.ctm.e += -min_x * state.ctm.a; + state.ctm.f += -min_y * state.ctm.d; + } + } + + svgtiny_parse_transform_attributes(svg, &state); + + for (xmlNode *child = svg->children; child; child = child->next) { + svgtiny_code code = svgtiny_OK; + + if (child->type == XML_ELEMENT_NODE) { + const char *name = (const char *) child->name; + if (strcmp(name, "svg") == 0) + code = svgtiny_parse_svg(child, state); + else if (strcmp(name, "g") == 0) + code = svgtiny_parse_svg(child, state); + else if (strcmp(name, "a") == 0) + code = svgtiny_parse_svg(child, state); + else if (strcmp(name, "path") == 0) + code = svgtiny_parse_path(child, state); + else if (strcmp(name, "rect") == 0) + code = svgtiny_parse_rect(child, state); + else if (strcmp(name, "circle") == 0) + code = svgtiny_parse_circle(child, state); + else if (strcmp(name, "line") == 0) + code = svgtiny_parse_line(child, state); + else if (strcmp(name, "polyline") == 0) + code = svgtiny_parse_poly(child, state, false); + else if (strcmp(name, "polygon") == 0) + code = svgtiny_parse_poly(child, state, true); + else if (strcmp(name, "text") == 0) + code = svgtiny_parse_text(child, state); + } + + if (code != svgtiny_OK) + return code; + } + + return svgtiny_OK; +} + + + +/** + * Parse a element node. + * + * http://www.w3.org/TR/SVG11/paths#PathElement + */ + +svgtiny_code svgtiny_parse_path(xmlNode *path, + struct svgtiny_parse_state state) +{ + char *s, *path_d; + + svgtiny_parse_paint_attributes(path, &state); + svgtiny_parse_transform_attributes(path, &state); + + /* read d attribute */ + s = path_d = (char *) xmlGetProp(path, (const xmlChar *) "d"); + if (!s) { + state.diagram->error_line = path->line; + state.diagram->error_message = "path: missing d attribute"; + return svgtiny_SVG_ERROR; + } + + /* allocate space for path: it will never have more elements than d */ + float *p = malloc(sizeof p[0] * strlen(s)); + if (!p) + return svgtiny_OUT_OF_MEMORY; + + /* parse d and build path */ + for (unsigned int i = 0; s[i]; i++) + if (s[i] == ',') + s[i] = ' '; + unsigned int i = 0; + float last_x = 0, last_y = 0; + float last_cubic_x = 0, last_cubic_y = 0; + float last_quad_x = 0, last_quad_y = 0; + while (*s) { + char command[2]; + int plot_command; + float x, y, x1, y1, x2, y2; + int n; + + /* moveto (M, m), lineto (L, l) (2 arguments) */ + if (sscanf(s, " %1[MmLl] %f %f %n", command, &x, &y, &n) == 3) { + /*LOG(("moveto or lineto"));*/ + if (*command == 'M' || *command == 'm') + plot_command = svgtiny_PATH_MOVE; + else + plot_command = svgtiny_PATH_LINE; + do { + p[i++] = plot_command; + if ('a' <= *command) { + x += last_x; + y += last_y; + } + p[i++] = last_cubic_x = last_quad_x = last_x + = x; + p[i++] = last_cubic_y = last_quad_y = last_y + = y; + s += n; + plot_command = svgtiny_PATH_LINE; + } while (sscanf(s, "%f %f %n", &x, &y, &n) == 2); + + /* closepath (Z, z) (no arguments) */ + } else if (sscanf(s, " %1[Zz] %n", command, &n) == 1) { + /*LOG(("closepath"));*/ + p[i++] = svgtiny_PATH_CLOSE; + s += n; + + /* horizontal lineto (H, h) (1 argument) */ + } else if (sscanf(s, " %1[Hh] %f %n", command, &x, &n) == 2) { + /*LOG(("horizontal lineto"));*/ + do { + p[i++] = svgtiny_PATH_LINE; + if (*command == 'h') + x += last_x; + p[i++] = last_cubic_x = last_quad_x = last_x + = x; + p[i++] = last_cubic_y = last_quad_y = last_y; + s += n; + } while (sscanf(s, "%f %n", &x, &n) == 1); + + /* vertical lineto (V, v) (1 argument) */ + } else if (sscanf(s, " %1[Vv] %f %n", command, &y, &n) == 2) { + /*LOG(("vertical lineto"));*/ + do { + p[i++] = svgtiny_PATH_LINE; + if (*command == 'v') + y += last_y; + p[i++] = last_cubic_x = last_quad_x = last_x; + p[i++] = last_cubic_y = last_quad_y = last_y + = y; + s += n; + } while (sscanf(s, "%f %n", &x, &n) == 1); + + /* curveto (C, c) (6 arguments) */ + } else if (sscanf(s, " %1[Cc] %f %f %f %f %f %f %n", command, + &x1, &y1, &x2, &y2, &x, &y, &n) == 7) { + /*LOG(("curveto"));*/ + do { + p[i++] = svgtiny_PATH_BEZIER; + if (*command == 'c') { + x1 += last_x; + y1 += last_y; + x2 += last_x; + y2 += last_y; + x += last_x; + y += last_y; + } + p[i++] = x1; + p[i++] = y1; + p[i++] = last_cubic_x = x2; + p[i++] = last_cubic_y = y2; + p[i++] = last_quad_x = last_x = x; + p[i++] = last_quad_y = last_y = y; + s += n; + } while (sscanf(s, "%f %f %f %f %f %f %n", + &x1, &y1, &x2, &y2, &x, &y, &n) == 6); + + /* shorthand/smooth curveto (S, s) (4 arguments) */ + } else if (sscanf(s, " %1[Ss] %f %f %f %f %n", command, + &x2, &y2, &x, &y, &n) == 5) { + /*LOG(("shorthand/smooth curveto"));*/ + do { + p[i++] = svgtiny_PATH_BEZIER; + x1 = last_x + (last_x - last_cubic_x); + y1 = last_y + (last_y - last_cubic_y); + if (*command == 's') { + x2 += last_x; + y2 += last_y; + x += last_x; + y += last_y; + } + p[i++] = x1; + p[i++] = y1; + p[i++] = last_cubic_x = x2; + p[i++] = last_cubic_y = y2; + p[i++] = last_quad_x = last_x = x; + p[i++] = last_quad_y = last_y = y; + s += n; + } while (sscanf(s, "%f %f %f %f %n", + &x2, &y2, &x, &y, &n) == 4); + + /* quadratic Bezier curveto (Q, q) (4 arguments) */ + } else if (sscanf(s, " %1[Qq] %f %f %f %f %n", command, + &x1, &y1, &x, &y, &n) == 5) { + /*LOG(("quadratic Bezier curveto"));*/ + do { + p[i++] = svgtiny_PATH_BEZIER; + last_quad_x = x1; + last_quad_y = y1; + if (*command == 'q') { + x1 += last_x; + y1 += last_y; + x += last_x; + y += last_y; + } + p[i++] = 1./3 * last_x + 2./3 * x1; + p[i++] = 1./3 * last_y + 2./3 * y1; + p[i++] = 2./3 * x1 + 1./3 * x; + p[i++] = 2./3 * y1 + 1./3 * y; + p[i++] = last_cubic_x = last_x = x; + p[i++] = last_cubic_y = last_y = y; + s += n; + } while (sscanf(s, "%f %f %f %f %n", + &x1, &y1, &x, &y, &n) == 4); + + /* shorthand/smooth quadratic Bezier curveto (T, t) + (2 arguments) */ + } else if (sscanf(s, " %1[Tt] %f %f %n", command, + &x, &y, &n) == 3) { + /*LOG(("shorthand/smooth quadratic Bezier curveto"));*/ + do { + p[i++] = svgtiny_PATH_BEZIER; + x1 = last_x + (last_x - last_quad_x); + y1 = last_y + (last_y - last_quad_y); + last_quad_x = x1; + last_quad_y = y1; + if (*command == 't') { + x1 += last_x; + y1 += last_y; + x += last_x; + y += last_y; + } + p[i++] = 1./3 * last_x + 2./3 * x1; + p[i++] = 1./3 * last_y + 2./3 * y1; + p[i++] = 2./3 * x1 + 1./3 * x; + p[i++] = 2./3 * y1 + 1./3 * y; + p[i++] = last_cubic_x = last_x = x; + p[i++] = last_cubic_y = last_y = y; + s += n; + } while (sscanf(s, "%f %f %n", + &x, &y, &n) == 2); + + } else { + /*LOG(("parse failed at \"%s\"", s));*/ + break; + } + } + + xmlFree(path_d); + + return svgtiny_add_path(p, i, &state); +} + + +/** + * Parse a element node. + * + * http://www.w3.org/TR/SVG11/shapes#RectElement + */ + +svgtiny_code svgtiny_parse_rect(xmlNode *rect, + struct svgtiny_parse_state state) +{ + float x, y, width, height; + + svgtiny_parse_position_attributes(rect, state, + &x, &y, &width, &height); + svgtiny_parse_paint_attributes(rect, &state); + svgtiny_parse_transform_attributes(rect, &state); + + float *p = malloc(13 * sizeof p[0]); + if (!p) + return svgtiny_OUT_OF_MEMORY; + + p[0] = svgtiny_PATH_MOVE; + p[1] = x; + p[2] = y; + p[3] = svgtiny_PATH_LINE; + p[4] = x + width; + p[5] = y; + p[6] = svgtiny_PATH_LINE; + p[7] = x + width; + p[8] = y + height; + p[9] = svgtiny_PATH_LINE; + p[10] = x; + p[11] = y + height; + p[12] = svgtiny_PATH_CLOSE; + + return svgtiny_add_path(p, 13, &state); +} + + +/** + * Parse a element node. + */ + +svgtiny_code svgtiny_parse_circle(xmlNode *circle, + struct svgtiny_parse_state state) +{ + float x = 0, y = 0, r = 0; + const float kappa = 0.5522847498; + + for (xmlAttr *attr = circle->properties; attr; attr = attr->next) { + const char *name = (const char *) attr->name; + const char *content = (const char *) attr->children->content; + if (strcmp(name, "cx") == 0) + x = svgtiny_parse_length(content, + state.viewport_width, state); + else if (strcmp(name, "cy") == 0) + y = svgtiny_parse_length(content, + state.viewport_height, state); + else if (strcmp(name, "r") == 0) + r = svgtiny_parse_length(content, + state.viewport_width, state); + } + svgtiny_parse_paint_attributes(circle, &state); + svgtiny_parse_transform_attributes(circle, &state); + + float *p = malloc(32 * sizeof p[0]); + if (!p) + return svgtiny_OUT_OF_MEMORY; + + p[0] = svgtiny_PATH_MOVE; + p[1] = x - r; + p[2] = y; + p[3] = svgtiny_PATH_BEZIER; + p[4] = x - r; + p[5] = y + r * kappa; + p[6] = x - r * kappa; + p[7] = y + r; + p[8] = x; + p[9] = y + r; + p[10] = svgtiny_PATH_BEZIER; + p[11] = x + r * kappa; + p[12] = y + r; + p[13] = x + r; + p[14] = y + r * kappa; + p[15] = x + r; + p[16] = y; + p[17] = svgtiny_PATH_BEZIER; + p[18] = x + r; + p[19] = y - r * kappa; + p[20] = x + r * kappa; + p[21] = y - r; + p[22] = x; + p[23] = y - r; + p[24] = svgtiny_PATH_BEZIER; + p[25] = x - r * kappa; + p[26] = y - r; + p[27] = x - r; + p[28] = y - r * kappa; + p[29] = x - r; + p[30] = y; + p[31] = svgtiny_PATH_CLOSE; + + return svgtiny_add_path(p, 32, &state); +} + + +/** + * Parse a element node. + */ + +svgtiny_code svgtiny_parse_line(xmlNode *line, + struct svgtiny_parse_state state) +{ + float x1 = 0, y1 = 0, x2 = 0, y2 = 0; + + for (xmlAttr *attr = line->properties; attr; attr = attr->next) { + const char *name = (const char *) attr->name; + const char *content = (const char *) attr->children->content; + if (strcmp(name, "x1") == 0) + x1 = svgtiny_parse_length(content, + state.viewport_width, state); + else if (strcmp(name, "y1") == 0) + y1 = svgtiny_parse_length(content, + state.viewport_height, state); + else if (strcmp(name, "x2") == 0) + x2 = svgtiny_parse_length(content, + state.viewport_width, state); + else if (strcmp(name, "y2") == 0) + y2 = svgtiny_parse_length(content, + state.viewport_height, state); + } + svgtiny_parse_paint_attributes(line, &state); + svgtiny_parse_transform_attributes(line, &state); + + float *p = malloc(7 * sizeof p[0]); + if (!p) + return svgtiny_OUT_OF_MEMORY; + + p[0] = svgtiny_PATH_MOVE; + p[1] = x1; + p[2] = y1; + p[3] = svgtiny_PATH_LINE; + p[4] = x2; + p[5] = y2; + p[6] = svgtiny_PATH_CLOSE; + + return svgtiny_add_path(p, 7, &state); +} + + +/** + * Parse a or element node. + * + * http://www.w3.org/TR/SVG11/shapes#PolylineElement + * http://www.w3.org/TR/SVG11/shapes#PolygonElement + */ + +svgtiny_code svgtiny_parse_poly(xmlNode *poly, + struct svgtiny_parse_state state, bool polygon) +{ + char *s, *points; + + svgtiny_parse_paint_attributes(poly, &state); + svgtiny_parse_transform_attributes(poly, &state); + + /* read points attribute */ + s = points = (char *) xmlGetProp(poly, (const xmlChar *) "points"); + if (!s) { + state.diagram->error_line = poly->line; + state.diagram->error_message = + "polyline/polygon: missing points attribute"; + return svgtiny_SVG_ERROR; + } + + /* allocate space for path: it will never have more elements than s */ + float *p = malloc(sizeof p[0] * strlen(s)); + if (!p) { + xmlFree(points); + return svgtiny_OUT_OF_MEMORY; + } + + /* parse s and build path */ + for (unsigned int i = 0; s[i]; i++) + if (s[i] == ',') + s[i] = ' '; + unsigned int i = 0; + while (*s) { + float x, y; + int n; + + if (sscanf(s, "%f %f %n", &x, &y, &n) == 2) { + if (i == 0) + p[i++] = svgtiny_PATH_MOVE; + else + p[i++] = svgtiny_PATH_LINE; + p[i++] = x; + p[i++] = y; + s += n; + } else { + break; + } + } + if (polygon) + p[i++] = svgtiny_PATH_CLOSE; + + xmlFree(points); + + return svgtiny_add_path(p, i, &state); +} + + +/** + * Parse a or element node. + */ + +svgtiny_code svgtiny_parse_text(xmlNode *text, + struct svgtiny_parse_state state) +{ + float x, y, width, height; + + svgtiny_parse_position_attributes(text, state, + &x, &y, &width, &height); + svgtiny_parse_font_attributes(text, &state); + svgtiny_parse_transform_attributes(text, &state); + + float px = state.ctm.a * x + state.ctm.c * y + state.ctm.e; + float py = state.ctm.b * x + state.ctm.d * y + state.ctm.f; +/* state.ctm.e = px - state.origin_x; */ +/* state.ctm.f = py - state.origin_y; */ + + /*struct css_style style = state.style; + style.font_size.value.length.value *= state.ctm.a;*/ + + for (xmlNode *child = text->children; child; child = child->next) { + svgtiny_code code = svgtiny_OK; + + if (child->type == XML_TEXT_NODE) { + struct svgtiny_shape *shape = svgtiny_add_shape(&state); + if (!shape) + return svgtiny_OUT_OF_MEMORY; + shape->text = strdup((const char *) child->content); + shape->text_x = px; + shape->text_y = py; + state.diagram->shape_count++; + + } else if (child->type == XML_ELEMENT_NODE && + strcmp((const char *) child->name, + "tspan") == 0) { + code = svgtiny_parse_text(child, state); + } + + if (!code != svgtiny_OK) + return code; + } + + return svgtiny_OK; +} + + +/** + * Parse x, y, width, and height attributes, if present. + */ + +void svgtiny_parse_position_attributes(const xmlNode *node, + const struct svgtiny_parse_state state, + float *x, float *y, float *width, float *height) +{ + *x = 0; + *y = 0; + *width = state.viewport_width; + *height = state.viewport_height; + + for (xmlAttr *attr = node->properties; attr; attr = attr->next) { + const char *name = (const char *) attr->name; + const char *content = (const char *) attr->children->content; + if (strcmp(name, "x") == 0) + *x = svgtiny_parse_length(content, + state.viewport_width, state); + else if (strcmp(name, "y") == 0) + *y = svgtiny_parse_length(content, + state.viewport_height, state); + else if (strcmp(name, "width") == 0) + *width = svgtiny_parse_length(content, + state.viewport_width, state); + else if (strcmp(name, "height") == 0) + *height = svgtiny_parse_length(content, + state.viewport_height, state); + } +} + + +/** + * Parse a length as a number of pixels. + */ + +float svgtiny_parse_length(const char *s, int viewport_size, + const struct svgtiny_parse_state state) +{ + int num_length = strspn(s, "0123456789+-."); + const char *unit = s + num_length; + float n = atof((const char *) s); + float font_size = 20; /*css_len2px(&state.style.font_size.value.length, 0);*/ + + if (unit[0] == 0) { + return n; + } else if (unit[0] == '%') { + return n / 100.0 * viewport_size; + } else if (unit[0] == 'e' && unit[1] == 'm') { + return n * font_size; + } else if (unit[0] == 'e' && unit[1] == 'x') { + return n / 2.0 * font_size; + } else if (unit[0] == 'p' && unit[1] == 'x') { + return n; + } else if (unit[0] == 'p' && unit[1] == 't') { + return n * 1.25; + } else if (unit[0] == 'p' && unit[1] == 'c') { + return n * 15.0; + } else if (unit[0] == 'm' && unit[1] == 'm') { + return n * 3.543307; + } else if (unit[0] == 'c' && unit[1] == 'm') { + return n * 35.43307; + } else if (unit[0] == 'i' && unit[1] == 'n') { + return n * 90; + } + + return 0; +} + + +/** + * Parse paint attributes, if present. + */ + +void svgtiny_parse_paint_attributes(const xmlNode *node, + struct svgtiny_parse_state *state) +{ + for (const xmlAttr *attr = node->properties; attr; attr = attr->next) { + const char *name = (const char *) attr->name; + const char *content = (const char *) attr->children->content; + if (strcmp(name, "fill") == 0) + svgtiny_parse_color(content, &state->fill, state); + else if (strcmp(name, "stroke") == 0) + svgtiny_parse_color(content, &state->stroke, state); + else if (strcmp(name, "stroke-width") == 0) + state->stroke_width = svgtiny_parse_length(content, + state->viewport_width, *state); + else if (strcmp(name, "style") == 0) { + const char *style = (const char *) + attr->children->content; + const char *s; + char *value; + if ((s = strstr(style, "fill:"))) { + s += 5; + while (*s == ' ') + s++; + value = strndup(s, strcspn(s, "; ")); + svgtiny_parse_color(value, &state->fill, state); + free(value); + } + if ((s = strstr(style, "stroke:"))) { + s += 7; + while (*s == ' ') + s++; + value = strndup(s, strcspn(s, "; ")); + svgtiny_parse_color(value, &state->stroke, state); + free(value); + } + if ((s = strstr(style, "stroke-width:"))) { + s += 13; + while (*s == ' ') + s++; + state->stroke_width = svgtiny_parse_length(s, + state->viewport_width, *state); + } + } + } +} + + +/** + * Parse a colour. + */ + +void svgtiny_parse_color(const char *s, svgtiny_colour *c, + struct svgtiny_parse_state *state) +{ + unsigned int r, g, b; + float rf, gf, bf; + size_t len = strlen(s); + char *id = 0, *rparen; + + if (len == 4 && s[0] == '#') { + if (sscanf(s + 1, "%1x%1x%1x", &r, &g, &b) == 3) + *c = svgtiny_RGB(r | r << 4, g | g << 4, b | b << 4); + + } else if (len == 7 && s[0] == '#') { + if (sscanf(s + 1, "%2x%2x%2x", &r, &g, &b) == 3) + *c = svgtiny_RGB(r, g, b); + + } else if (10 <= len && s[0] == 'r' && s[1] == 'g' && s[2] == 'b' && + s[3] == '(' && s[len - 1] == ')') { + if (sscanf(s + 4, "%i,%i,%i", &r, &g, &b) == 3) + *c = svgtiny_RGB(r, g, b); + else if (sscanf(s + 4, "%f%%,%f%%,%f%%", &rf, &gf, &bf) == 3) { + b = bf * 255 / 100; + g = gf * 255 / 100; + r = rf * 255 / 100; + *c = svgtiny_RGB(r, g, b); + } + + } else if (len == 4 && strcmp(s, "none") == 0) { + *c = svgtiny_TRANSPARENT; + + } else if (5 < len && s[0] == 'u' && s[1] == 'r' && s[2] == 'l' && + s[3] == '(') { + if (s[4] == '#') { + id = strdup(s + 5); + if (!id) + return; + rparen = strchr(id, ')'); + if (rparen) + *rparen = 0; + svgtiny_find_gradient(id, state); + free(id); + fprintf(stderr, "linear_gradient_stop_count %i\n", + state->linear_gradient_stop_count); + if (state->linear_gradient_stop_count == 0) + *c = svgtiny_TRANSPARENT; + else if (state->linear_gradient_stop_count == 1) + *c = state->gradient_stop[0].color; + else + *c = svgtiny_LINEAR_GRADIENT; + } + + } else { + const struct svgtiny_named_color *named_color; + named_color = svgtiny_color_lookup(s, strlen(s)); + if (named_color) + *c = named_color->color; + } +} + + +/** + * Parse font attributes, if present. + */ + +void svgtiny_parse_font_attributes(const xmlNode *node, + struct svgtiny_parse_state *state) +{ + for (const xmlAttr *attr = node->properties; attr; attr = attr->next) { + if (strcmp((const char *) attr->name, "font-size") == 0) { + /*if (css_parse_length( + (const char *) attr->children->content, + &state->style.font_size.value.length, + true, true)) { + state->style.font_size.size = + CSS_FONT_SIZE_LENGTH; + }*/ + } + } +} + + +/** + * Parse transform attributes, if present. + * + * http://www.w3.org/TR/SVG11/coords#TransformAttribute + */ + +void svgtiny_parse_transform_attributes(xmlNode *node, + struct svgtiny_parse_state *state) +{ + char *transform; + + /* parse transform */ + transform = (char *) xmlGetProp(node, (const xmlChar *) "transform"); + if (transform) { + svgtiny_parse_transform(transform, &state->ctm.a, &state->ctm.b, + &state->ctm.c, &state->ctm.d, + &state->ctm.e, &state->ctm.f); + xmlFree(transform); + } +} + + +/** + * Parse a transform string. + */ + +void svgtiny_parse_transform(char *s, float *ma, float *mb, + float *mc, float *md, float *me, float *mf) +{ + float a, b, c, d, e, f; + float za, zb, zc, zd, ze, zf; + float angle, x, y; + int n; + + for (unsigned int i = 0; s[i]; i++) + if (s[i] == ',') + s[i] = ' '; + + while (*s) { + a = d = 1; + b = c = 0; + e = f = 0; + if (sscanf(s, "matrix (%f %f %f %f %f %f) %n", + &a, &b, &c, &d, &e, &f, &n) == 6) + ; + else if (sscanf(s, "translate (%f %f) %n", + &e, &f, &n) == 2) + ; + else if (sscanf(s, "translate (%f) %n", + &e, &n) == 1) + ; + else if (sscanf(s, "scale (%f %f) %n", + &a, &d, &n) == 2) + ; + else if (sscanf(s, "scale (%f) %n", + &a, &n) == 1) + d = a; + else if (sscanf(s, "rotate (%f %f %f) %n", + &angle, &x, &y, &n) == 3) { + angle = angle / 180 * M_PI; + a = cos(angle); + b = sin(angle); + c = -sin(angle); + d = cos(angle); + e = -x * cos(angle) + y * sin(angle) + x; + f = -x * sin(angle) - y * cos(angle) + y; + } else if (sscanf(s, "rotate (%f) %n", + &angle, &n) == 1) { + angle = angle / 180 * M_PI; + a = cos(angle); + b = sin(angle); + c = -sin(angle); + d = cos(angle); + } else if (sscanf(s, "skewX (%f) %n", + &angle, &n) == 1) { + angle = angle / 180 * M_PI; + c = tan(angle); + } else if (sscanf(s, "skewY (%f) %n", + &angle, &n) == 1) { + angle = angle / 180 * M_PI; + b = tan(angle); + } else + break; + za = *ma * a + *mc * b; + zb = *mb * a + *md * b; + zc = *ma * c + *mc * d; + zd = *mb * c + *md * d; + ze = *ma * e + *mc * f + *me; + zf = *mb * e + *md * f + *mf; + *ma = za; + *mb = zb; + *mc = zc; + *md = zd; + *me = ze; + *mf = zf; + s += n; + } +} + + +/** + * Add a path to the svgtiny_diagram. + */ + +svgtiny_code svgtiny_add_path(float *p, unsigned int n, + struct svgtiny_parse_state *state) +{ + if (state->fill == svgtiny_LINEAR_GRADIENT) + return svgtiny_add_path_linear_gradient(p, n, state); + + svgtiny_transform_path(p, n, state); + + struct svgtiny_shape *shape = svgtiny_add_shape(state); + if (!shape) { + free(p); + return svgtiny_OUT_OF_MEMORY; + } + shape->path = p; + shape->path_length = n; + state->diagram->shape_count++; + + return svgtiny_OK; +} + + +/** + * Add a svgtiny_shape to the svgtiny_diagram. + */ + +struct svgtiny_shape *svgtiny_add_shape(struct svgtiny_parse_state *state) +{ + struct svgtiny_shape *shape = realloc(state->diagram->shape, + (state->diagram->shape_count + 1) * + sizeof (state->diagram->shape[0])); + if (!shape) + return 0; + state->diagram->shape = shape; + + shape += state->diagram->shape_count; + shape->path = 0; + shape->path_length = 0; + shape->text = 0; + shape->fill = state->fill; + shape->stroke = state->stroke; + shape->stroke_width = state->stroke_width * + (state->ctm.a + state->ctm.d) / 2; + + return shape; +} + + +/** + * Apply the current transformation matrix to a path. + */ + +void svgtiny_transform_path(float *p, unsigned int n, + struct svgtiny_parse_state *state) +{ + for (unsigned int j = 0; j != n; ) { + unsigned int points = 0; + switch ((int) p[j]) { + case svgtiny_PATH_MOVE: + case svgtiny_PATH_LINE: + points = 1; + break; + case svgtiny_PATH_CLOSE: + points = 0; + break; + case svgtiny_PATH_BEZIER: + points = 3; + break; + default: + assert(0); + } + j++; + for (unsigned int k = 0; k != points; k++) { + float x0 = p[j], y0 = p[j + 1]; + float x = state->ctm.a * x0 + state->ctm.c * y0 + + state->ctm.e; + float y = state->ctm.b * x0 + state->ctm.d * y0 + + state->ctm.f; + p[j] = x; + p[j + 1] = y; + j += 2; + } + } +} + + +/** + * Free all memory used by a diagram. + */ + +void svgtiny_free(struct svgtiny_diagram *svg) +{ + assert(svg); + + for (unsigned int i = 0; i != svg->shape_count; i++) { + free(svg->shape[i].path); + free(svg->shape[i].text); + } + + free(svg->shape); + + free(svg); +} + -- cgit v1.2.3