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61d387135f
Basically, when we first encounter the document, we parse it as before, but we also note the offsets of other glyphs and store the remaining XML. The next time we see another glyph, we can simply parse that glyph node and insert it back into the stored XML.
367 lines
13 KiB
C++
367 lines
13 KiB
C++
/**************************************************************************/
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/* thorvg_svg_in_ot.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifdef GDEXTENSION
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// Headers for building as GDExtension plug-in.
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#include <godot_cpp/classes/xml_parser.hpp>
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#include <godot_cpp/core/mutex_lock.hpp>
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#include <godot_cpp/godot.hpp>
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#include <godot_cpp/templates/vector.hpp>
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using namespace godot;
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#elif defined(GODOT_MODULE)
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// Headers for building as built-in module.
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#include "core/error/error_macros.h"
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#include "core/io/xml_parser.h"
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#include "core/os/memory.h"
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#include "core/os/os.h"
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#include "core/string/ustring.h"
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#include "core/typedefs.h"
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#include "core/variant/variant.h"
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#include "modules/modules_enabled.gen.h" // For svg, freetype.
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#endif
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#ifdef MODULE_SVG_ENABLED
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#ifdef MODULE_FREETYPE_ENABLED
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#include "thorvg_svg_in_ot.h"
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#include <freetype/otsvg.h>
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#include <ft2build.h>
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#include <math.h>
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#include <stdlib.h>
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FT_Error tvg_svg_in_ot_init(FT_Pointer *p_state) {
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*p_state = memnew(TVG_State);
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return FT_Err_Ok;
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}
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void tvg_svg_in_ot_free(FT_Pointer *p_state) {
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TVG_State *state = *reinterpret_cast<TVG_State **>(p_state);
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memdelete(state);
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}
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static void construct_xml(Ref<XMLParser> &parser, double &r_embox_x, double &r_embox_y, String *p_xml, int64_t &r_tag_count) {
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if (parser->get_node_type() == XMLParser::NODE_ELEMENT) {
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*p_xml += vformat("<%s", parser->get_node_name());
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bool is_svg_tag = parser->get_node_name() == "svg";
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for (int i = 0; i < parser->get_attribute_count(); i++) {
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String aname = parser->get_attribute_name(i);
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String value = parser->get_attribute_value(i);
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if (is_svg_tag && aname == "viewBox") {
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PackedStringArray vb = value.split(" ");
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if (vb.size() == 4) {
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r_embox_x = vb[2].to_float();
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r_embox_y = vb[3].to_float();
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}
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} else if (is_svg_tag && aname == "width") {
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r_embox_x = value.to_float();
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} else if (is_svg_tag && aname == "height") {
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r_embox_y = value.to_float();
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} else {
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*p_xml += vformat(" %s=\"%s\"", aname, value);
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}
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}
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if (parser->is_empty()) {
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*p_xml += "/>";
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} else {
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*p_xml += ">";
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if (r_tag_count >= 0) {
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r_tag_count++;
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}
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}
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} else if (parser->get_node_type() == XMLParser::NODE_TEXT) {
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*p_xml += parser->get_node_data();
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} else if (parser->get_node_type() == XMLParser::NODE_ELEMENT_END) {
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*p_xml += vformat("</%s>", parser->get_node_name());
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if (r_tag_count > 0) {
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r_tag_count--;
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}
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}
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}
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FT_Error tvg_svg_in_ot_preset_slot(FT_GlyphSlot p_slot, FT_Bool p_cache, FT_Pointer *p_state) {
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TVG_State *state = *reinterpret_cast<TVG_State **>(p_state);
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if (!state) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "SVG in OT state not initialized.");
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}
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MutexLock lock(state->mutex);
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FT_SVG_Document document = (FT_SVG_Document)p_slot->other;
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FT_Size_Metrics metrics = document->metrics;
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GL_State &gl_state = state->glyph_map[p_slot->glyph_index];
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if (!gl_state.ready) {
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Ref<XMLParser> parser;
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parser.instantiate();
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parser->_open_buffer((const uint8_t *)document->svg_document, document->svg_document_length);
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String xml_body;
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double embox_x = document->units_per_EM;
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double embox_y = document->units_per_EM;
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TVG_DocumentCache &cache = state->document_map[document->svg_document];
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if (!cache.xml_body.is_empty()) {
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// If we have a cached document, that means we have already parsed it.
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// All node cache should be available.
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xml_body = cache.xml_body;
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embox_x = cache.embox_x;
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embox_y = cache.embox_y;
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ERR_FAIL_COND_V(!cache.node_caches.has(p_slot->glyph_index), FT_Err_Invalid_SVG_Document);
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Vector<TVG_NodeCache> &ncs = cache.node_caches[p_slot->glyph_index];
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uint64_t offset = 0;
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for (TVG_NodeCache &nc : ncs) {
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// Seek will call read() internally.
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if (parser->seek(nc.document_offset) == OK) {
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int64_t tag_count = 0;
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String xml_node;
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// We only parse the glyph node.
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do {
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construct_xml(parser, embox_x, embox_y, &xml_node, tag_count);
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} while (tag_count != 0 && parser->read() == OK);
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xml_body = xml_body.insert(nc.body_offset + offset, xml_node);
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offset += xml_node.length();
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}
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}
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} else {
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String xml_node;
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String xml_body_temp;
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String *p_xml = &xml_body_temp;
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int64_t tag_count = -1;
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while (parser->read() == OK) {
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if (parser->has_attribute("id")) {
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const String &gl_name = parser->get_named_attribute_value("id");
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if (gl_name.begins_with("glyph")) {
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int dot_pos = gl_name.find_char('.');
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int64_t gl_idx = gl_name.substr(5, (dot_pos > 0) ? dot_pos - 5 : -1).to_int();
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TVG_NodeCache node_cache = TVG_NodeCache();
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node_cache.document_offset = parser->get_node_offset(),
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node_cache.body_offset = (uint64_t)cache.xml_body.length();
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cache.node_caches[gl_idx].push_back(node_cache);
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if (p_slot->glyph_index != gl_idx) {
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parser->skip_section();
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continue;
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}
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tag_count = 0;
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xml_node = "";
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p_xml = &xml_node;
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}
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}
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xml_body_temp = "";
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construct_xml(parser, embox_x, embox_y, p_xml, tag_count);
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if (xml_body_temp.length() > 0) {
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xml_body += xml_body_temp;
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cache.xml_body += xml_body_temp;
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continue;
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}
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if (tag_count == 0) {
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p_xml = &xml_body_temp;
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tag_count = -1;
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xml_body += xml_node;
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}
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}
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cache.embox_x = embox_x;
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cache.embox_y = embox_y;
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}
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std::unique_ptr<tvg::Picture> picture = tvg::Picture::gen();
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gl_state.xml_code = xml_body.utf8();
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tvg::Result result = picture->load(gl_state.xml_code.get_data(), gl_state.xml_code.length(), "svg+xml", false);
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if (result != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to load SVG document (glyph metrics).");
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}
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float svg_width, svg_height;
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picture->size(&svg_width, &svg_height);
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double aspect = svg_width / svg_height;
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result = picture->size(embox_x * aspect, embox_y);
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if (result != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to resize SVG document.");
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}
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double x_svg_to_out = (double)metrics.x_ppem / embox_x;
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double y_svg_to_out = (double)metrics.y_ppem / embox_y;
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gl_state.m.e11 = (double)document->transform.xx / (1 << 16);
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gl_state.m.e12 = -(double)document->transform.xy / (1 << 16);
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gl_state.m.e21 = -(double)document->transform.yx / (1 << 16);
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gl_state.m.e22 = (double)document->transform.yy / (1 << 16);
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gl_state.m.e13 = (double)document->delta.x / 64 * embox_x / metrics.x_ppem;
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gl_state.m.e23 = -(double)document->delta.y / 64 * embox_y / metrics.y_ppem;
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gl_state.m.e31 = 0;
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gl_state.m.e32 = 0;
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gl_state.m.e33 = 1;
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result = picture->size(embox_x * aspect * x_svg_to_out, embox_y * y_svg_to_out);
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if (result != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to resize SVG document.");
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}
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result = picture->transform(gl_state.m);
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if (result != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to apply transform to SVG document.");
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}
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picture->size(&gl_state.w, &gl_state.h);
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gl_state.x = (gl_state.h - gl_state.w) / 2.0;
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gl_state.y = -gl_state.h;
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gl_state.ready = true;
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}
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p_slot->bitmap_left = (FT_Int)gl_state.x;
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p_slot->bitmap_top = (FT_Int)-gl_state.y;
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double tmpd = Math::ceil(gl_state.h);
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p_slot->bitmap.rows = (unsigned int)tmpd;
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tmpd = Math::ceil(gl_state.w);
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p_slot->bitmap.width = (unsigned int)tmpd;
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p_slot->bitmap.pitch = (int)p_slot->bitmap.width * 4;
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p_slot->bitmap.pixel_mode = FT_PIXEL_MODE_BGRA;
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float metrics_width = (float)gl_state.w;
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float metrics_height = (float)gl_state.h;
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float horiBearingX = (float)gl_state.x;
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float horiBearingY = (float)-gl_state.y;
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float vertBearingX = p_slot->metrics.horiBearingX / 64.0f - p_slot->metrics.horiAdvance / 64.0f / 2;
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float vertBearingY = (p_slot->metrics.vertAdvance / 64.0f - p_slot->metrics.height / 64.0f) / 2;
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float tmpf = Math::round(metrics_width * 64);
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p_slot->metrics.width = (FT_Pos)tmpf;
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tmpf = Math::round(metrics_height * 64);
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p_slot->metrics.height = (FT_Pos)tmpf;
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p_slot->metrics.horiBearingX = (FT_Pos)(horiBearingX * 64);
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p_slot->metrics.horiBearingY = (FT_Pos)(horiBearingY * 64);
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p_slot->metrics.vertBearingX = (FT_Pos)(vertBearingX * 64);
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p_slot->metrics.vertBearingY = (FT_Pos)(vertBearingY * 64);
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if (p_slot->metrics.vertAdvance == 0) {
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p_slot->metrics.vertAdvance = (FT_Pos)(metrics_height * 1.2f * 64);
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}
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return FT_Err_Ok;
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}
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FT_Error tvg_svg_in_ot_render(FT_GlyphSlot p_slot, FT_Pointer *p_state) {
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TVG_State *state = *reinterpret_cast<TVG_State **>(p_state);
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if (!state) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "SVG in OT state not initialized.");
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}
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MutexLock lock(state->mutex);
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if (!state->glyph_map.has(p_slot->glyph_index)) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "SVG glyph not loaded.");
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}
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GL_State &gl_state = state->glyph_map[p_slot->glyph_index];
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ERR_FAIL_COND_V_MSG(!gl_state.ready, FT_Err_Invalid_SVG_Document, "SVG glyph not ready.");
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std::unique_ptr<tvg::Picture> picture = tvg::Picture::gen();
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tvg::Result res = picture->load(gl_state.xml_code.get_data(), gl_state.xml_code.length(), "svg+xml", false);
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to load SVG document (glyph rendering).");
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}
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res = picture->size(gl_state.w, gl_state.h);
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to resize SVG document.");
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}
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res = picture->transform(gl_state.m);
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_SVG_Document, "Failed to apply transform to SVG document.");
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}
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std::unique_ptr<tvg::SwCanvas> sw_canvas = tvg::SwCanvas::gen();
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res = sw_canvas->target((uint32_t *)p_slot->bitmap.buffer, (int)p_slot->bitmap.width, (int)p_slot->bitmap.width, (int)p_slot->bitmap.rows, tvg::SwCanvas::ARGB8888S);
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_Outline, "Failed to create SVG canvas.");
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}
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res = sw_canvas->push(std::move(picture));
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_Outline, "Failed to set SVG canvas source.");
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}
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res = sw_canvas->draw();
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_Outline, "Failed to draw to SVG canvas.");
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}
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res = sw_canvas->sync();
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if (res != tvg::Result::Success) {
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ERR_FAIL_V_MSG(FT_Err_Invalid_Outline, "Failed to sync SVG canvas.");
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}
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state->glyph_map.erase(p_slot->glyph_index);
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p_slot->bitmap.pixel_mode = FT_PIXEL_MODE_BGRA;
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p_slot->bitmap.num_grays = 256;
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p_slot->format = FT_GLYPH_FORMAT_BITMAP;
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return FT_Err_Ok;
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}
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SVG_RendererHooks tvg_svg_in_ot_hooks = {
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(SVG_Lib_Init_Func)tvg_svg_in_ot_init,
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(SVG_Lib_Free_Func)tvg_svg_in_ot_free,
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(SVG_Lib_Render_Func)tvg_svg_in_ot_render,
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(SVG_Lib_Preset_Slot_Func)tvg_svg_in_ot_preset_slot,
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};
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SVG_RendererHooks *get_tvg_svg_in_ot_hooks() {
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return &tvg_svg_in_ot_hooks;
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}
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#endif // MODULE_FREETYPE_ENABLED
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#endif // MODULE_SVG_ENABLED
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