Merge pull request opencv#22226 from ocpalo:libspng

[GSoC 2022] spng encoder/decoder added as optional png codec

3rdparty/libspng/CMakeLists.txt

@@ -0,0 +1,47 @@
+# ----------------------------------------------------------------------------
+#  CMake file for libspng. See root CMakeLists.txt
+#
+# ----------------------------------------------------------------------------
+
+project(${SPNG_LIBRARY})
+
+set(CURR_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}")
+set_property(GLOBAL PROPERTY SPNG_INCLUDE_DIR ${CURR_INCLUDE_DIR})
+ocv_include_directories(${ZLIB_INCLUDE_DIRS})
+
+file(GLOB_RECURSE spng_headers RELATIVE "${CMAKE_CURRENT_LIST_DIR}" "*.h")
+file(GLOB_RECURSE spng_sources RELATIVE "${CMAKE_CURRENT_LIST_DIR}" "*.c")
+
+message(STATUS "libspng will be used as PNG codec")
+
+# ----------------------------------------------------------------------------------
+#         Define the library target:
+# ----------------------------------------------------------------------------------
+
+if(MSVC)
+    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
+endif(MSVC)
+
+add_library(${SPNG_LIBRARY} STATIC ${OPENCV_3RDPARTY_EXCLUDE_FROM_ALL} ${spng_headers} ${spng_sources})
+ocv_warnings_disable(CMAKE_C_FLAGS -Wunused-variable)
+target_link_libraries(${SPNG_LIBRARY} ${ZLIB_LIBRARIES})
+
+set_target_properties(${SPNG_LIBRARY}
+        PROPERTIES OUTPUT_NAME ${SPNG_LIBRARY}
+        DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
+        COMPILE_PDB_NAME ${SPNG_LIBRARY}
+        COMPILE_PDB_NAME_DEBUG "${SPNG_LIBRARY}${OPENCV_DEBUG_POSTFIX}"
+        ARCHIVE_OUTPUT_DIRECTORY ${3P_LIBRARY_OUTPUT_PATH}
+        )
+
+target_compile_definitions(${SPNG_LIBRARY} PUBLIC SPNG_STATIC)
+
+if(ENABLE_SOLUTION_FOLDERS)
+    set_target_properties(${SPNG_LIBRARY} PROPERTIES FOLDER "3rdparty")
+endif()
+
+if(NOT BUILD_SHARED_LIBS)
+    ocv_install_target(${SPNG_LIBRARY} EXPORT OpenCVModules ARCHIVE DESTINATION ${OPENCV_3P_LIB_INSTALL_PATH} COMPONENT dev OPTIONAL)
+endif()
+
+ocv_install_3rdparty_licenses(${SPNG_LIBRARY} LICENSE)

3rdparty/libspng/LICENSE

@@ -0,0 +1,25 @@
+BSD 2-Clause License
+
+Copyright (c) 2018-2022, Randy <[email protected]>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.