feat: Add apng support for vtfpp.

Author: Trico-Everfire

ext/_ext.cmake

@@ -87,11 +87,12 @@ endfunction()
 # stb
 add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/stb")
 
+#apng_loader
+add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/apng_loader")
 
 # tinyexr
 add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/tinyexr")
 
-
 # tbb
 function(sourcepp_add_tbb TARGET)
     if(SOURCEPP_BUILD_WITH_TBB)

ext/apng_loader/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.28)
+
+project(apng_loader)
+
+add_library(${PROJECT_NAME} STATIC ${CMAKE_CURRENT_LIST_DIR}/uc_apng_loader.cpp ${CMAKE_CURRENT_LIST_DIR}/uc_apng_loader.h)
+target_link_libraries(${PROJECT_NAME} PRIVATE sourcepp_stb)
+target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_LIST_DIR})

ext/apng_loader/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017
+
+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.

ext/apng_loader/uc_apng_loader.cpp

@@ -0,0 +1 @@
+#include "uc_apng_loader.h"