Add more build-config variables

- HAVE_IMAGEMAGICK and HAVE_RESVG will be #defined 0 or 1
- AV{CODEC,FORMAT,UTIL}_VERSION_STR will contain the FFmpeg
  component versions detected by CMake when configuring the build

include/OpenShotVersion.h.in

@@ -42,8 +42,13 @@
 
 #define OPENSHOT_VERSION_SO @PROJECT_SO_VERSION@         /// Shared object version number. This increments any time the API and ABI changes (so old apps will no longer link)
 
-// Useful dependency versioning
-#define QT_VERSION_STR "@QT_VERSION_STR@"
+// Useful dependency versioning / feature availability
+#cmakedefine QT_VERSION_STR "@QT_VERSION_STR@"
+#cmakedefine AVCODEC_VERSION_STR "@AVCODEC_VERSION_STR@"
+#cmakedefine AVFORMAT_VERSION_STR "@AVFORMAT_VERSION_STR@"
+#cmakedefine AVUTIL_VERSION_STR "@AVUTIL_VERSION_STR@"
+#cmakedefine01 HAVE_IMAGEMAGICK
+#cmakedefine01 HAVE_RESVG
 
 #include <sstream>
 

src/CMakeLists.txt

@@ -59,11 +59,6 @@ IF (MAGICKCORE_HDRI_ENABLE)
 ELSE (MAGICKCORE_HDRI_ENABLE)
 	add_definitions( -DMAGICKCORE_HDRI_ENABLE=0 )
 ENDIF (MAGICKCORE_HDRI_ENABLE)
-IF (OPENSHOT_IMAGEMAGICK_COMPATIBILITY)
-	add_definitions( -DOPENSHOT_IMAGEMAGICK_COMPATIBILITY=${OPENSHOT_IMAGEMAGICK_COMPATIBILITY} )
-ELSE (OPENSHOT_IMAGEMAGICK_COMPATIBILITY)
-	add_definitions( -DOPENSHOT_IMAGEMAGICK_COMPATIBILITY=0 )
-ENDIF (OPENSHOT_IMAGEMAGICK_COMPATIBILITY)
 
 # Find the ImageMagick++ library
 find_package(ImageMagick COMPONENTS Magick++ MagickWand MagickCore)
@@ -75,6 +70,8 @@ if (ImageMagick_FOUND)
 	add_definitions( -DUSE_IMAGEMAGICK=1 )
 	set(CMAKE_SWIG_FLAGS "-DUSE_IMAGEMAGICK=1")
 
+    set(HAVE_IMAGEMAGICK TRUE CACHE BOOL "Building with ImageMagick support" FORCE)
+    mark_as_advanced(HAVE_IMAGEMAGICK)
 endif()
 
 ################# LIBOPENSHOT-AUDIO ###################
@@ -297,10 +294,20 @@ mark_as_advanced(QT_VERSION_STR)
 # Find FFmpeg libraries (used for video encoding / decoding)
 find_package(FFmpeg REQUIRED COMPONENTS avcodec avdevice avformat avutil swscale)
 
-foreach(ff_comp avcodec avdevice avformat avfilter avutil postproc swscale swresample avresample)
+set(all_comps avcodec avdevice avformat avfilter avutil postproc swscale swresample avresample)
+set(version_comps avcodec avformat avutil)
+
+foreach(ff_comp IN LISTS all_comps)
   if(TARGET FFmpeg::${ff_comp})
-		target_link_libraries(openshot PUBLIC FFmpeg::${ff_comp})
+    target_link_libraries(openshot PUBLIC FFmpeg::${ff_comp})
+    # Keep track of some FFmpeg lib versions, to embed in our version header
+    if(${ff_comp} IN_LIST version_comps)
+      string(TOUPPER ${ff_comp} v_name)
+      set(${v_name}_VERSION_STR ${${ff_comp}_VERSION} CACHE STRING "${ff_comp} version used" FORCE)
+      mark_as_advanced(${v_name}_VERSION_STR)
+    endif()
   endif()
+
 endforeach()
 
 ################### Threads ####################
@@ -363,6 +370,10 @@ if (TARGET RESVG::resvg)
 
   target_compile_definitions(openshot PUBLIC "-DUSE_RESVG=1")
   set(CMAKE_SWIG_FLAGS "-DUSE_RESVG=1")
+
+  set(HAVE_RESVG TRUE CACHE BOOL "Building with Resvg support" FORCE)
+  mark_as_advanced(HAVE_RESVG)
+
 endif()
 
 ###############  LINK LIBRARY  #################