feat(png): add lodepng library

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "lib/crypto/SHA256"]
 	path = lib/crypto/SHA256
 	url = https://github.com/ilvn/SHA256
+[submodule "lib/lodepng/lodepng"]
+	path = lib/lodepng/lodepng
+	url = https://github.com/lvandeve/lodepng

lodepng @ 7fdcc96a

+Subproject commit 7fdcc96a5e5864eee72911c3ca79b1d9f0d12292

lib/lodepng/lodepng.c

+lodepng/lodepng.cpp
\ No newline at end of file

lib/lodepng/meson.build

+includes = include_directories(
+  './lodepng',
+)
+
+sources = files(
+  './lodepng.c',
+)
+
+lib = static_library(
+  'lodepng',
+  sources,
+  include_directories: includes,
+  c_args: ['-O3', '-w', '-DLODEPNG_NO_COMPILE_ENCODER', '-DLODEPNG_NO_COMPILE_DISK', '-DLODEPNG_NO_COMPILE_ALLOCATORS'],
+)
+
+lodepng = declare_dependency(
+  include_directories: includes,
+  link_with: lib,
+)

lib/meson.build

@@ -17,3 +17,4 @@ subdir('./crypto/')
 subdir('./card10/')
 subdir('./mx25lba/')
 subdir('./ff13/')
+subdir('./lodepng/')

tools/code-style.sh

@@ -41,6 +41,7 @@ formatter_blacklist=(
     lib/ff13/
     lib/FreeRTOS/
     lib/FreeRTOS-Plus/
+    lib/lodepng/
     lib/micropython/
     lib/mx25lba/
     lib/sdk/