SVG : refactor and simplify width/height+viewBox logic (https://www.w3.org/TR/SVG11/struct.html#SVGElement) + check font_sizes_ size before accesing last element
This commit is contained in:
Artem Pavlenko
parent
0feabeb7e8
commit
654a3c1f9f
1 changed files with 80 additions and 78 deletions
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@ -304,7 +304,7 @@ double parse_font_size(T & parser, char const* str)
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{
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parser.err_handler().on_error("SVG parse error: failed to parse <font-size> with value \"" + std::string(str) + "\"");
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}
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parser.font_sizes_.back() = val;
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if (!parser.font_sizes_.empty()) parser.font_sizes_.back() = val;
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return val;
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}
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@ -837,7 +837,7 @@ void parse_attr(svg_parser & parser, char const* name, char const* value )
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break;
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case "font-size"_case:
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{
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double font_size = parse_font_size(parser, value);
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parse_font_size(parser, value);
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break;
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}
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default:
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@ -872,9 +872,9 @@ void parse_attr(svg_parser & parser, rapidxml::xml_node<char> const* node)
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void parse_dimensions(svg_parser & parser, rapidxml::xml_node<char> const* node)
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{
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double width = 0;
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double height = 0;
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double aspect_ratio = 1;
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// https://www.w3.org/TR/SVG11/struct.html#SVGElement
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double width = 1; // 100%
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double height = 1; // 100%
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viewbox vbox = {0, 0, 0, 0};
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bool has_percent_height = true;
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bool has_percent_width = true;
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@ -896,85 +896,87 @@ void parse_dimensions(svg_parser & parser, rapidxml::xml_node<char> const* node)
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agg::trans_affine t{};
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parser.vbox_ = vbox;
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parser.normalized_diagonal_ = std::sqrt(vbox.width * vbox.width + vbox.height * vbox.height)/std::sqrt(2.0);
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if (!has_percent_width && !has_percent_height)
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{
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if (width > 0 && height > 0 && vbox.width > 0 && vbox.height > 0)
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{
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std::pair<unsigned,bool> preserve_aspect_ratio {xMidYMid, true};
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auto const* aspect_ratio_attr = node->first_attribute("preserveAspectRatio");
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if (aspect_ratio_attr)
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{
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preserve_aspect_ratio = parse_preserve_aspect_ratio(parser.err_handler(), aspect_ratio_attr->value());
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}
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double sx = width / vbox.width;
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double sy = height / vbox.height;
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double scale = preserve_aspect_ratio.second ? std::min(sx, sy) : std::max(sx, sy);
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switch (preserve_aspect_ratio.first)
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{
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case none:
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t = agg::trans_affine_scaling(sx, sy) * t;
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break;
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case xMinYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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break;
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case xMinYMid:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(0, -0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMinYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(0, -1.0 * (vbox.height - height / scale)) * t;
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break;
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case xMidYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale), 0.0) * t;
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break;
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case xMidYMid: // (the default)
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
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-0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMidYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
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-1.0 * (vbox.height - height / scale)) * t;
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break;
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case xMaxYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale), 0.0) * t;
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break;
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case xMaxYMid:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
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-0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMaxYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
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-1.0 * (vbox.height - height / scale)) * t;
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break;
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};
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if (has_percent_width) width = vbox.width * width;
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else if (!width_attr || width == 0) width = vbox.width;
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if (has_percent_height) height = vbox.height * height;
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else if (!height_attr || height == 0) height = vbox.height;
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if (width > 0 && height > 0 && vbox.width > 0 && vbox.height > 0)
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{
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std::pair<unsigned,bool> preserve_aspect_ratio {xMidYMid, true};
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auto const* aspect_ratio_attr = node->first_attribute("preserveAspectRatio");
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if (aspect_ratio_attr)
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{
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preserve_aspect_ratio = parse_preserve_aspect_ratio(parser.err_handler(), aspect_ratio_attr->value());
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}
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}
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if (has_percent_width && !has_percent_height)
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{
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aspect_ratio = vbox.width / vbox.height;
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width = aspect_ratio * height;
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}
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else if (!has_percent_width && has_percent_height)
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{
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aspect_ratio = vbox.width/vbox.height;
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height = height / aspect_ratio;
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}
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else if (has_percent_width && has_percent_height)
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{
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width = vbox.width;
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height = vbox.height;
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double sx = width / vbox.width;
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double sy = height / vbox.height;
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double scale = preserve_aspect_ratio.second ? std::min(sx, sy) : std::max(sx, sy);
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switch (preserve_aspect_ratio.first)
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{
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case none:
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t = agg::trans_affine_scaling(sx, sy) * t;
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break;
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case xMinYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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break;
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case xMinYMid:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(0, -0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMinYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(0, -1.0 * (vbox.height - height / scale)) * t;
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break;
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case xMidYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale), 0.0) * t;
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break;
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case xMidYMid: // (the default)
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
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-0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMidYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-0.5 * (vbox.width - width / scale),
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-1.0 * (vbox.height - height / scale)) * t;
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break;
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case xMaxYMin:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale), 0.0) * t;
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break;
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case xMaxYMid:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
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-0.5 * (vbox.height - height / scale)) * t;
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break;
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case xMaxYMax:
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t = agg::trans_affine_scaling(scale, scale) * t;
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t = agg::trans_affine_translation(-1.0 * (vbox.width - width / scale),
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-1.0 * (vbox.height - height / scale)) * t;
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break;
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};
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}
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t = agg::trans_affine_translation(-vbox.x0, -vbox.y0) * t;
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parser.viewbox_tr_ = t;
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}
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else if (width == 0 || height == 0 || has_percent_width || has_percent_height)
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{
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std::stringstream ss;
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ss << "SVG parse error: can't infer valid image dimensions from \" width:";
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if (has_percent_width) ss << width * 100 << "%";
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else ss << width;
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ss << " height:";
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if (has_percent_height) ss << height * 100 << "%";
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else ss << height;
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ss << "\"";
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parser.err_handler().on_error(ss.str());
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parser.path_.set_dimensions(0, 0);
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return;
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}
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parser.path_.set_dimensions(width, height);
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}
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