tools svg2tvg: introduce a new tool for exporting tvg.

This is an utility to convert a file from svg to tvg
To use this, enable the feature by toggling in the meson option.

$meson build -Dtools="svg2tvg" ...

See also the usage:

Usage:
   svg2tvg [SVG file]

Examples:
    $ svg2tvg input.svg

meson_options.txt

@@ -30,7 +30,7 @@ option('bindings',
 
 option('tools',
    type: 'array',
-   choices: ['', 'svg2png'],
+   choices: ['', 'svg2tvg', 'svg2png'],
    value: [''],
    description: 'Enable building thorvg tools')
 

src/bin/meson.build

@@ -2,3 +2,7 @@ if get_option('tools').contains('svg2png') == true
    subdir('svg2png')
 endif
 
+if get_option('tools').contains('svg2tvg') == true
+   subdir('svg2tvg')
+endif
+

src/bin/svg2tvg/meson.build

@@ -0,0 +1,6 @@
+svg2tvg_src  = files('svg2tvg.cpp')
+
+executable('svg2tvg',
+           svg2tvg_src,
+           include_directories : headers,
+           link_with : thorvg_lib)

src/bin/svg2tvg/svg2tvg.cpp

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd. All rights reserved.
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <iostream>
+#include <thorvg.h>
+#include <vector>
+
+using namespace std;
+using namespace tvg;
+
+   
+void helpMsg()
+{
+    cout<<"Usage: \n   svg2tvg [SVG file]\n\nExamples: \n    $ svg2tvg input.svg\n\n";
+}
+
+bool convert(string& in, string& out)
+{
+    if (Initializer::init(CanvasEngine::Sw, 0) != Result::Success) return false;
+        
+    auto picture = Picture::gen();
+    if (picture->load(in) != Result::Success) return false;
+
+    auto saver = Saver::gen();
+    if (saver->save(move(picture), out) != Result::Success) return false;
+    if (saver->sync() != Result::Success) return false;
+
+    if (Initializer::term(CanvasEngine::Sw) != Result::Success) return false;
+
+    return true;
+}
+
+
+int main(int argc, char **argv)
+{
+    //No Input SVG
+    if (argc < 2) {
+        helpMsg();
+        return 0;
+    }
+
+    auto input = argv[1];
+
+    array<char, 5000> memory;
+
+#ifdef _WIN32
+    input = _fullpath(memory.data(), input, memory.size());
+#else
+    input = realpath(input, memory.data());
+#endif
+
+    //Verify svg file.
+    if (!input) {
+        helpMsg();
+        return 0;
+    }
+
+    string svgName(input);
+    string extn = ".svg";
+
+    if (svgName.size() <= extn.size() || svgName.substr(svgName.size() - extn.size()) != extn) {
+        helpMsg();
+        return 0;
+    }
+
+    //Get tvg file.
+    auto tvgName = svgName.substr(svgName.find_last_of("/\\") + 1);
+    tvgName.append(".tvg");
+
+    //Convert!
+    if (convert(svgName, tvgName)) {
+        cout<<"Generated TVG file : "<< tvgName << endl;
+    } else {
+        cout<<"Failed Converting TVG file : "<< tvgName << endl;
+    }
+
+    return 0;
+}