Adding SSE4.1 optimized CRC32 and Adler32 - 15% faster for 24bpp with…

… MSVC 2022

Switching back to unlicense
Exposing some utility API's
Adding "SSE" option to CMakeLists.txt file

CMakeLists.txt

@@ -2,8 +2,10 @@ project(fpng_test)
 
 cmake_minimum_required(VERSION 3.0)
 option(BUILD_X64 "build 64-bit" TRUE)
+option(SSE "SSE 4.1 support" FALSE)
 
 message("Initial BUILD_X64=${BUILD_X64}")
+message("Initial SSE=${SSE}")
 
 if( NOT CMAKE_BUILD_TYPE )
   set( CMAKE_BUILD_TYPE Release )
@@ -17,6 +19,12 @@ else()
 	message("Building 32-bit")
 endif()
 
+if (SSE)
+	message("SSE enabled")
+else()
+	message("SSE disabled")
+endif()
+
 if (NOT MSVC)
    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g")
    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g")
@@ -43,14 +51,21 @@ if (NOT MSVC)
    set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} ${GCC_COMPILE_FLAGS}")
    set(CMAKE_CXX_FLAGS_RELEASE  "${CMAKE_CXX_FLAGS_RELEASE} ${GCC_COMPILE_FLAGS}")
    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${GCC_COMPILE_FLAGS} -D_DEBUG")
+
+   if (SSE)
+		set(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} -DFPNG_NO_SSE=0 -msse4.1 -mpclmul")
+		set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -DFPNG_NO_SSE=0 -msse4.1 -mpclmul")
+   else()
+	  	set(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} -DFPNG_NO_SSE=1")
+		set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -DFPNG_NO_SSE=1")
+   endif()
 else()
 	set(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS}")
 	set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS}")
 endif()
 
 set(FPNG_SRC_LIST ${COMMON_SRC_LIST} 
 	src/fpng.cpp
-	src/Crc32.cpp
 	src/fpng_test.cpp
 	src/lodepng.cpp
 	)

fpng.vcxproj

@@ -143,13 +143,11 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="src/Crc32.cpp" />
     <ClCompile Include="src/fpng.cpp" />
     <ClCompile Include="src/fpng_test.cpp" />
     <ClCompile Include="src/lodepng.cpp" />
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="src/Crc32.h" />
     <ClInclude Include="src/fpng.h" />
     <ClInclude Include="src/lodepng.h" />
     <ClInclude Include="src/qoi.h" />
@@ -159,4 +157,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

fpng.vcxproj.filters

@@ -18,9 +18,6 @@
     <ClCompile Include="src/fpng.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="src/Crc32.cpp">
-      <Filter>Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="src/fpng_test.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
@@ -29,9 +26,6 @@
     </ClCompile>
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="src/Crc32.h">
-      <Filter>Source Files</Filter>
-    </ClInclude>
     <ClInclude Include="src/fpng.h">
       <Filter>Source Files</Filter>
     </ClInclude>
@@ -48,4 +42,4 @@
       <Filter>Source Files</Filter>
     </ClInclude>
   </ItemGroup>
-</Project>
+</Project>