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SVG parser - simplify viewport/viewBox logic + use functions e.g 'premultiply' rather than operator*= for clarity.

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This commit is contained in:
Artem Pavlenko 2022-12-19 11:07:03 +00:00
parent d417b8933a
commit 32263cde89
3 changed files with 88 additions and 93 deletions
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1
include/mapnik/svg/svg_parser.hpp
View file

@ -111,7 +111,6 @@ class MAPNIK_DECL svg_parser : private util::noncopyable
mapnik::css_data css_data_;
boost::optional<viewbox> vbox_{};
double normalized_diagonal_ = 0.0;
agg::trans_affine viewbox_tr_{};
std::deque<double> font_sizes_{};
error_handler err_handler_;
};

18
include/mapnik/svg/svg_transform_grammar_x3_def.hpp
View file

@ -64,7 +64,7 @@ auto const matrix_action = [](auto const& ctx) {
auto d = boost::fusion::at_c<3>(attr);
auto e = boost::fusion::at_c<4>(attr);
auto f = boost::fusion::at_c<5>(attr);
tr = agg::trans_affine(a, b, c, d, e, f) * tr;
tr.premultiply(agg::trans_affine(a, b, c, d, e, f));
};
auto const rotate_action = [](auto const& ctx) {
@ -75,14 +75,14 @@ auto const rotate_action = [](auto const& ctx) {
auto cy = boost::fusion::at_c<2>(attr) ? *boost::fusion::at_c<2>(attr) : 0.0;
if (cx == 0.0 && cy == 0.0)
{
tr = agg::trans_affine_rotation(agg::deg2rad(a)) * tr;
tr.premultiply(agg::trans_affine_rotation(agg::deg2rad(a)));
}
else
{
agg::trans_affine t = agg::trans_affine_translation(-cx, -cy);
t *= agg::trans_affine_rotation(agg::deg2rad(a));
t *= agg::trans_affine_translation(cx, cy);
tr = t * tr;
tr.premultiply(t);
}
};
@ -92,9 +92,9 @@ auto const translate_action = [](auto const& ctx) {
auto tx = boost::fusion::at_c<0>(attr);
auto ty = boost::fusion::at_c<1>(attr);
if (ty)
tr = agg::trans_affine_translation(tx, *ty) * tr;
tr.premultiply(agg::trans_affine_translation(tx, *ty));
else
tr = agg::trans_affine_translation(tx, 0.0) * tr;
tr.premultiply(agg::trans_affine_translation(tx, 0.0));
};
auto const scale_action = [](auto const& ctx) {
@ -103,21 +103,21 @@ auto const scale_action = [](auto const& ctx) {
auto sx = boost::fusion::at_c<0>(attr);
auto sy = boost::fusion::at_c<1>(attr);
if (sy)
tr = agg::trans_affine_scaling(sx, *sy) * tr;
tr.premultiply(agg::trans_affine_scaling(sx, *sy));
else
tr = agg::trans_affine_scaling(sx, sx) * tr;
tr.premultiply(agg::trans_affine_scaling(sx, sx));
};
auto const skewX_action = [](auto const& ctx) {
auto& tr = extract_transform(ctx);
auto skew_x = _attr(ctx);
tr = agg::trans_affine_skewing(agg::deg2rad(skew_x), 0.0) * tr;
tr.premultiply(agg::trans_affine_skewing(agg::deg2rad(skew_x), 0.0));
};
auto const skewY_action = [](auto const& ctx) {
auto& tr = extract_transform(ctx);
auto skew_y = _attr(ctx);
tr = agg::trans_affine_skewing(0.0, agg::deg2rad(skew_y)) * tr;
tr.premultiply(agg::trans_affine_skewing(0.0, agg::deg2rad(skew_y)));
};
// rules

78
src/svg/svg_parser.cpp
View file

@ -54,6 +54,8 @@ MAPNIK_DISABLE_WARNING_POP
#include <fstream>
#include <array>
namespace mapnik {
namespace svg {
@ -540,6 +542,15 @@ void traverse_tree(svg_parser& parser, rapidxml::xml_node<char> const* node)
process_css(parser, node);
parse_attr(parser, node);
}
break;
case "svg"_case:
if (node->first_node() != nullptr)
{
parser.path_.push_attr();
parse_attr(parser, node);
parse_dimensions(parser, node);
}
break;
case "use"_case:
parser.path_.push_attr();
@ -642,38 +653,26 @@ void parse_element(svg_parser& parser, char const* name, rapidxml::xml_node<char
switch (name_to_int(name))
{
case "path"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_path(parser, node);
break;
case "polygon"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_polygon(parser, node);
break;
case "polyline"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_polyline(parser, node);
break;
case "line"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_line(parser, node);
break;
case "rect"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_rect(parser, node);
break;
case "circle"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_circle(parser, node);
break;
case "ellipse"_case:
parser.path_.transform().multiply(parser.viewbox_tr_);
parse_ellipse(parser, node);
break;
case "svg"_case:
parser.path_.push_attr();
parse_dimensions(parser, node);
parse_attr(parser, node);
break;
default:
handle_unsupported(parser, unsupported_elements, name, "element");
break;
@ -893,7 +892,6 @@ void parse_dimensions(svg_parser& parser, rapidxml::xml_node<char> const* node)
viewbox vbox = {0, 0, 0, 0};
bool has_percent_height = true;
bool has_percent_width = true;
auto const* width_attr = node->first_attribute("width");
if (width_attr)
{
@ -933,58 +931,56 @@ void parse_dimensions(svg_parser& parser, rapidxml::xml_node<char> const* node)
double sx = width / vbox.width;
double sy = height / vbox.height;
double scale = preserve_aspect_ratio.second ? std::min(sx, sy) : std::max(sx, sy);
switch (preserve_aspect_ratio.first)
{
case none:
t = agg::trans_affine_scaling(sx, sy) * t;
t.premultiply(agg::trans_affine_scaling(sx, sy));
break;
case xMinYMin:
t = agg::trans_affine_scaling(scale, scale) * t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
break;
case xMinYMid:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(0, -0.5 * (vbox.height - height / scale)) * t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(0, -0.5 * (vbox.height - height / scale)));
break;
case xMinYMax:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(0, -1.0 * (vbox.height - height / scale)) * t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(0, -1.0 * (vbox.height - height / scale)));
break;
case xMidYMin:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale), 0.0) * t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-0.5 * (vbox.width - width / scale), 0.0));
break;
case xMidYMid: // (the default)
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
-0.5 * (vbox.height - height / scale)) *
t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
-0.5 * (vbox.height - height / scale)));
break;
case xMidYMax:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
-1.0 * (vbox.height - height / scale)) *
t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
-1.0 * (vbox.height - height / scale)));
break;
case xMaxYMin:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale), 0.0) * t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-1.0 * (vbox.width - width / scale), 0.0));
break;
case xMaxYMid:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
-0.5 * (vbox.height - height / scale)) *
t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
-0.5 * (vbox.height - height / scale)));
break;
case xMaxYMax:
t = agg::trans_affine_scaling(scale, scale) * t;
t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
-1.0 * (vbox.height - height / scale)) *
t;
t.premultiply(agg::trans_affine_scaling(scale, scale));
t.premultiply(agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
-1.0 * (vbox.height - height / scale)));
break;
};
t.premultiply(agg::trans_affine_translation(-vbox.x0, -vbox.y0));
parser.path_.transform().premultiply(t);
}
t = agg::trans_affine_translation(-vbox.x0, -vbox.y0) * t;
parser.viewbox_tr_ = t;
}
else if (width == 0 || height == 0 || has_percent_width || has_percent_height)
{