Convert .tgs with go libraries (and cgo) (telegram) (#1569)

This commit adds support for go/cgo tgs conversion when building with the -tags `cgo`
The default binaries are still "pure" go and uses the old way of converting.

* Move lottie_convert.py conversion code to its own file

* Add optional libtgsconverter

* Update vendor

* Apply suggestions from code review

* Update bridge/helper/libtgsconverter.go

Co-authored-by: Wim <wim@42.be>

vendor/github.com/Benau/go_rlottie/generate_from_rlottie.py

@@ -0,0 +1,122 @@
+#!/usr/bin/python3
+# ./generate_from_rlottie.py /path/to/clean/rlottie/src/ /path/to/clean/rlottie/inc/
+import glob
+import os
+import re
+import sys
+
+FILE_KEYS = {}
+
+def get_closest_local_header(header):
+    for full_path, local in FILE_KEYS.items():
+        if os.path.basename(full_path) == header:
+            return local
+    return ''
+
+def fix_headers(code_text):
+    out = ''
+    has_neon = False
+    for line in code_text:
+        # Special fixes
+        if line == '#include <vpoint.h>':
+            line = '#include "vpoint.h"'
+        if line == '#include <vsharedptr.h>':
+            line = '#include "vsharedptr.h"'
+        if line == '#include <vglobal.h>':
+            line = '#include "vglobal.h"'
+        if line == '#include <vrect.h>':
+            line = '#include "vrect.h"'
+        # ARM on apple fixes
+        if '__ARM_NEON__' in line:
+            has_neon = True
+            line = line.replace('__ARM_NEON__', 'USE_ARM_NEON')
+        header_file = re.match('#include\s+["]([^"]+)["].*', line)
+        # regex to search for <, > too
+        #header_file = re.match('#include\s+[<"]([^>"]+)[>"].*', line)
+        if header_file:
+            header = header_file.groups()[0]
+            abs_header = os.path.abspath(header)
+            header_exists = os.path.exists(abs_header)
+            if header_exists and abs_header in FILE_KEYS:
+                out += '#include "' + FILE_KEYS[abs_header] + '"\n'
+            else:
+                local = get_closest_local_header(header)
+                if local != '':
+                    out += '#include "' + local + '"\n'
+                else:
+                    out += line + '\n'
+        else:
+            out += line + '\n'
+    if has_neon:
+        out = '#include "config.h"\n' + out
+    return out
+
+if len(sys.argv) < 2:
+    print('usage: ./generate_from_rlottie.py /path/to/clean/rlottie/src/ /path/to/clean/rlottie/inc/')
+    os._exit(1)
+
+code = ['.c', '.s', '.S', '.sx', 'cc', 'cpp', 'cpp' ]
+header = ['.h', '.hh', '.hpp', '.hxx' ]
+
+# Remove old files
+files = os.listdir('.')
+for file in files:
+    if file.endswith(tuple(code)) or file.endswith(tuple(header)):
+        os.remove(os.path.join('.', file))
+
+paths = []
+it = iter(sys.argv)
+next(it, None)
+for argv in it:
+    paths.append(argv)
+
+for path in paths:
+    for file in glob.iglob(path + '/**', recursive=True):
+        # Ignore msvc config.h and wasm file
+        if file.endswith('config.h') or 'wasm' in file:
+            continue
+        if file.endswith(tuple(code)) or file.endswith(tuple(header)):
+            key = os.path.abspath(file)
+            val = file.replace(path, '').replace('/', '_')
+            FILE_KEYS[key] = val
+
+header_check = []
+for full_path, local in FILE_KEYS.items():
+    header_file = os.path.basename(full_path)
+    if header_file.endswith(tuple(code)):
+        continue
+    if not header_file in header_check:
+        header_check.append(header_file)
+    else:
+        print('WARNING: ' + header_file + ' has multiple reference in subdirectories')
+
+cur_dir = os.path.abspath('.')
+for full_path, local in FILE_KEYS.items():
+    os.chdir(os.path.dirname(full_path))
+    with open(full_path) as code:
+        code_text = code.read().splitlines() 
+    code.close()
+    fixed = fix_headers(code_text)
+    os.chdir(cur_dir)
+    local_file = open(local, "w")
+    local_file.write(fixed)
+    local_file.close()
+
+# Write config.h
+config = '#ifndef GO_RLOTTIE_HPP\n#define GO_RLOTTIE_HPP\n'
+# ARM on apple won't compile
+config += '#ifndef __APPLE__\n#ifdef __ARM_NEON__\n#define USE_ARM_NEON\n#endif\n#endif\n'
+config += '#define LOTTIE_THREAD_SUPPORT\n#define LOTTIE_CACHE_SUPPORT\n'
+config += '#endif\n'
+config_file = open('config.h', "w")
+config_file.write(config)
+config_file.close()
+
+# Fix vector_pixman_pixman-arm-neon-asm.S
+with open('vector_pixman_pixman-arm-neon-asm.S') as code:
+    assembly = code.read()
+code.close()
+assembly = '#include "config.h"\n#ifdef USE_ARM_NEON\n' + assembly + '#endif\n'
+fixed_assembly = open('vector_pixman_pixman-arm-neon-asm.S', "w")
+fixed_assembly.write(assembly)
+fixed_assembly.close()