static fz_path *
svg_parse_polygon_imp(fz_context *ctx, svg_document *doc, fz_xml *node, int doclose)
{
fz_path *path;
const char *str = fz_xml_att(node, "points");
float number;
float args[2];
int nargs;
int isfirst;
if (!str)
return NULL;
isfirst = 1;
nargs = 0;
path = fz_new_path(ctx);
while (*str)
{
while (svg_is_whitespace_or_comma(*str))
str ++;
if (svg_is_digit(*str))
{
str = svg_lex_number(&number, str);
args[nargs++] = number;
}
if (nargs == 2)
{
if (isfirst)
{
fz_moveto(ctx, path, args[0], args[1]);
isfirst = 0;
}
else
{
fz_lineto(ctx, path, args[0], args[1]);
}
nargs = 0;
}
}
return path;
}
void
svg_parse_color(fz_context *ctx, svg_document *doc, const char *str, float *rgb)
{
int i, l, m, r, cmp, n;
rgb[0] = 0.0f;
rgb[1] = 0.0f;
rgb[2] = 0.0f;
/* Crack hex-coded RGB */
if (str[0] == '#')
{
str ++;
n = strlen(str);
if (n == 3 || (n > 3 && !ishex(str[3])))
{
rgb[0] = (unhex(str[0]) * 16 + unhex(str[0])) / 255.0f;
rgb[1] = (unhex(str[1]) * 16 + unhex(str[1])) / 255.0f;
rgb[2] = (unhex(str[2]) * 16 + unhex(str[2])) / 255.0f;
return;
}
if (n >= 6)
{
rgb[0] = (unhex(str[0]) * 16 + unhex(str[1])) / 255.0f;
rgb[1] = (unhex(str[2]) * 16 + unhex(str[3])) / 255.0f;
rgb[2] = (unhex(str[4]) * 16 + unhex(str[5])) / 255.0f;
return;
}
return;
}
/* rgb(X,Y,Z) -- whitespace allowed around numbers */
else if (strstr(str, "rgb("))
{
int numberlen = 0;
char numberbuf[50];
str = str + 4;
for (i = 0; i < 3; i++)
{
while (svg_is_whitespace_or_comma(*str))
str ++;
if (svg_is_digit(*str))
{
numberlen = 0;
while (svg_is_digit(*str) && numberlen < sizeof(numberbuf) - 1)
numberbuf[numberlen++] = *str++;
numberbuf[numberlen] = 0;
if (*str == '%')
{
str ++;
rgb[i] = fz_atof(numberbuf) / 100.0f;
}
else
{
rgb[i] = fz_atof(numberbuf) / 255.0f;
}
}
}
return;
}
/* TODO: parse icc-profile(X,Y,Z,W) syntax */
/* Search for a pre-defined color */
else
{
char keyword[50], *p;
fz_strlcpy(keyword, str, sizeof keyword);
p = keyword;
while (*p && *p >= 'a' && *p <= 'z')
++p;
*p = 0;
l = 0;
r = sizeof(svg_predefined_colors) / sizeof(svg_predefined_colors[0]);
while (l <= r)
{
m = (l + r) / 2;
cmp = strcmp(svg_predefined_colors[m].name, keyword);
if (cmp > 0)
r = m - 1;
else if (cmp < 0)
l = m + 1;
else
{
rgb[0] = svg_predefined_colors[m].red / 255.0f;
rgb[1] = svg_predefined_colors[m].green / 255.0f;
rgb[2] = svg_predefined_colors[m].blue / 255.0f;
return;
}
}
}
}
static fz_path *
svg_parse_path_data(fz_context *ctx, svg_document *doc, const char *str)
{
fz_path *path = fz_new_path(ctx);
fz_point p;
float x1, y1, x2, y2;
int cmd;
float number;
float args[6];
int nargs;
/* saved control point for smooth curves */
int reset_smooth = 1;
float smooth_x = 0.0;
float smooth_y = 0.0;
cmd = 0;
nargs = 0;
fz_try(ctx)
{
fz_moveto(ctx, path, 0.0, 0.0); /* for the case of opening 'm' */
while (*str)
{
while (svg_is_whitespace_or_comma(*str))
str ++;
if (svg_is_digit(*str))
{
str = svg_lex_number(&number, str);
if (nargs == 6)
fz_throw(ctx, FZ_ERROR_GENERIC, "stack overflow in path data");
args[nargs++] = number;
}
else if (svg_is_alpha(*str))
{
if (nargs != 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "syntax error in path data (wrong number of parameters to '%c')", cmd);
cmd = *str++;
}
else if (*str == 0)
{
break;
}
else
{
fz_throw(ctx, FZ_ERROR_GENERIC, "syntax error in path data: '%c'", *str);
}
if (reset_smooth)
{
smooth_x = 0.0;
smooth_y = 0.0;
}
reset_smooth = 1;
switch (cmd)
{
case 'M':
if (nargs == 2)
{
fz_moveto(ctx, path, args[0], args[1]);
nargs = 0;
cmd = 'L'; /* implicit lineto after */
}
break;
case 'm':
if (nargs == 2)
{
p = fz_currentpoint(ctx, path);
fz_moveto(ctx, path, p.x + args[0], p.y + args[1]);
nargs = 0;
cmd = 'l'; /* implicit lineto after */
}
break;
case 'Z':
case 'z':
if (nargs == 0)
{
fz_closepath(ctx, path);
}
break;
case 'L':
if (nargs == 2)
{
fz_lineto(ctx, path, args[0], args[1]);
nargs = 0;
}
break;
case 'l':
if (nargs == 2)
{
p = fz_currentpoint(ctx, path);
fz_lineto(ctx, path, p.x + args[0], p.y + args[1]);
nargs = 0;
}
break;
case 'H':
if (nargs == 1)
{
p = fz_currentpoint(ctx, path);
fz_lineto(ctx, path, args[0], p.y);
nargs = 0;
}
break;
case 'h':
if (nargs == 1)
{
p = fz_currentpoint(ctx, path);
fz_lineto(ctx, path, p.x + args[0], p.y);
nargs = 0;
}
break;
case 'V':
if (nargs == 1)
{
p = fz_currentpoint(ctx, path);
fz_lineto(ctx, path, p.x, args[0]);
nargs = 0;
}
break;
case 'v':
if (nargs == 1)
{
p = fz_currentpoint(ctx, path);
fz_lineto(ctx, path, p.x, p.y + args[0]);
nargs = 0;
}
break;
case 'C':
reset_smooth = 0;
if (nargs == 6)
{
fz_curveto(ctx, path, args[0], args[1], args[2], args[3], args[4], args[5]);
smooth_x = args[4] - args[2];
smooth_y = args[5] - args[3];
nargs = 0;
}
break;
case 'c':
reset_smooth = 0;
if (nargs == 6)
{
p = fz_currentpoint(ctx, path);
fz_curveto(ctx, path,
p.x + args[0], p.y + args[1],
p.x + args[2], p.y + args[3],
p.x + args[4], p.y + args[5]);
smooth_x = args[4] - args[2];
smooth_y = args[5] - args[3];
nargs = 0;
}
break;
case 'S':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
fz_curveto(ctx, path,
p.x + smooth_x, p.y + smooth_y,
args[0], args[1],
args[2], args[3]);
smooth_x = args[2] - args[0];
smooth_y = args[3] - args[1];
nargs = 0;
}
break;
case 's':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
fz_curveto(ctx, path,
p.x + smooth_x, p.y + smooth_y,
p.x + args[0], p.y + args[1],
p.x + args[2], p.y + args[3]);
smooth_x = args[2] - args[0];
smooth_y = args[3] - args[1];
nargs = 0;
}
break;
case 'Q':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
x1 = args[0];
y1 = args[1];
x2 = args[2];
y2 = args[3];
fz_curveto(ctx, path,
(p.x + 2 * x1) / 3, (p.y + 2 * y1) / 3,
(x2 + 2 * x1) / 3, (y2 + 2 * y1) / 3,
x2, y2);
smooth_x = x2 - x1;
smooth_y = y2 - y1;
nargs = 0;
}
break;
case 'q':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
x1 = args[0] + p.x;
y1 = args[1] + p.y;
x2 = args[2] + p.x;
y2 = args[3] + p.y;
fz_curveto(ctx, path,
(p.x + 2 * x1) / 3, (p.y + 2 * y1) / 3,
(x2 + 2 * x1) / 3, (y2 + 2 * y1) / 3,
x2, y2);
smooth_x = x2 - x1;
smooth_y = y2 - y1;
nargs = 0;
}
break;
case 'T':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
x1 = p.x + smooth_x;
y1 = p.y + smooth_y;
x2 = args[0];
y2 = args[1];
fz_curveto(ctx, path,
(p.x + 2 * x1) / 3, (p.y + 2 * y1) / 3,
(x2 + 2 * x1) / 3, (y2 + 2 * y1) / 3,
x2, y2);
smooth_x = x2 - x1;
smooth_y = y2 - y1;
nargs = 0;
}
break;
case 't':
reset_smooth = 0;
if (nargs == 4)
{
p = fz_currentpoint(ctx, path);
x1 = p.x + smooth_x;
y1 = p.y + smooth_y;
x2 = args[0] + p.x;
y2 = args[1] + p.y;
fz_curveto(ctx, path,
(p.x + 2 * x1) / 3, (p.y + 2 * y1) / 3,
(x2 + 2 * x1) / 3, (y2 + 2 * y1) / 3,
x2, y2);
smooth_x = x2 - x1;
smooth_y = y2 - y1;
nargs = 0;
}
break;
case 0:
if (nargs != 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "path data must begin with a command");
break;
default:
fz_throw(ctx, FZ_ERROR_GENERIC, "unrecognized command in path data: '%c'", cmd);
}
}
}
fz_catch(ctx)
{
fz_drop_path(ctx, path);
fz_rethrow(ctx);
}
return path;
}
/* Coordinate transformations */
fz_matrix
svg_parse_transform(fz_context *ctx, svg_document *doc, const char *str, fz_matrix transform)
{
char keyword[20];
int keywordlen;
float args[6];
int nargs;
nargs = 0;
keywordlen = 0;
while (*str)
{
while (svg_is_whitespace_or_comma(*str))
str ++;
if (*str == 0)
break;
/*
* Parse keyword and opening parenthesis.
*/
keywordlen = 0;
while (svg_is_alpha(*str) && keywordlen < sizeof(keyword) - 1)
keyword[keywordlen++] = *str++;
keyword[keywordlen] = 0;
if (keywordlen == 0)
fz_throw(ctx, FZ_ERROR_SYNTAX, "expected keyword in transform attribute");
while (svg_is_whitespace(*str))
str ++;
if (*str != '(')
fz_throw(ctx, FZ_ERROR_SYNTAX, "expected opening parenthesis in transform attribute");
str ++;
/*
* Parse list of numbers until closing parenthesis
*/
nargs = 0;
while (*str && *str != ')' && nargs < 6)
{
while (svg_is_whitespace_or_comma(*str))
str ++;
if (svg_is_digit(*str))
str = svg_lex_number(&args[nargs++], str);
}
if (*str != ')')
fz_throw(ctx, FZ_ERROR_SYNTAX, "expected closing parenthesis in transform attribute");
str ++;
/*
* Execute the transform.
*/
if (!strcmp(keyword, "matrix"))
{
fz_matrix m;
if (nargs != 6)
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to matrix(): %d", nargs);
m.a = args[0];
m.b = args[1];
m.c = args[2];
m.d = args[3];
m.e = args[4];
m.f = args[5];
transform = fz_concat(transform, m);
}
else if (!strcmp(keyword, "translate"))
{
if (nargs != 2)
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to translate(): %d", nargs);
transform = fz_pre_translate(transform, args[0], args[1]);
}
else if (!strcmp(keyword, "scale"))
{
if (nargs == 1)
transform = fz_pre_scale(transform, args[0], args[0]);
else if (nargs == 2)
transform = fz_pre_scale(transform, args[0], args[1]);
else
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to scale(): %d", nargs);
}
else if (!strcmp(keyword, "rotate"))
{
if (nargs != 1)
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to rotate(): %d", nargs);
transform = fz_pre_rotate(transform, args[0]);
}
else if (!strcmp(keyword, "skewX"))
{
fz_matrix m;
if (nargs != 1)
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to skewX(): %d", nargs);
m.a = 1;
m.b = 0;
m.c = tanf(args[0] * FZ_DEGREE);
m.d = 1;
m.e = 0;
m.f = 0;
transform = fz_concat(transform, m);
}
else if (!strcmp(keyword, "skewY"))
{
fz_matrix m;
if (nargs != 1)
fz_throw(ctx, FZ_ERROR_SYNTAX, "wrong number of arguments to skewY(): %d", nargs);
m.a = 1;
m.b = tanf(args[0] * FZ_DEGREE);
m.c = 0;
m.d = 1;
m.e = 0;
m.f = 0;
transform = fz_concat(transform, m);
}
else
{
fz_throw(ctx, FZ_ERROR_SYNTAX, "unknown transform function: %s", keyword);
}
}
return transform;
}
