add cmake output which input formats are supported for heif-enc (#1205)

Author: farindk

examples/CMakeLists.txt

@@ -125,10 +125,27 @@ endif ()
 
 find_package(TIFF)
 if (TIFF_FOUND)
-    message("libtiff found, building heif-enc with TIFF input support")
     target_link_libraries(heif-enc PRIVATE TIFF::TIFF)
     target_sources(heif-enc PRIVATE decoder_tiff.cc decoder_tiff.h)
     target_compile_definitions(heif-enc PUBLIC HAVE_LIBTIFF=1)
+endif ()
+
+message("")
+message("=== Active input formats for heif-enc ===")
+if (JPEG_FOUND)
+    message("JPEG: active")
+else ()
+    message("JPEG: ------ (libjpeg not found)")
+endif ()
+if (PNG_FOUND)
+    message("PNG:  active")
 else ()
-    message("libtiff NOT found, building heif-enc without TIFF input support")
+    message("PNG:  ------ (libpng not found)")
 endif ()
+if (TIFF_FOUND)
+    message("TIFF: active")
+else ()
+    message("TIFF: ------ (libtiff not found)")
+endif ()
+message("")
+