Fastcv ext changes for Opencv Acceleration

cleanup and added make rules to download the
fastcv bins from the 3rdparty repo

Change-Id: I9a9db68a310263658ec93ea299ea37860d07c507

modules/fastcv/CMakeLists.txt

@@ -1,18 +1,22 @@
-set(the_description "FastCV extension module")
-ocv_define_module(fastcv opencv_core opencv_imgproc opencv_features2d opencv_video WRAP python java)
-
-if (FASTCV_DIR)
-  if(NOT ARM AND NOT AARCH64)
-    # the reason this warning is not fatal is to enable proper code analysis
-    # in your favourite IDE
-    message(WARNING "FastCV supports ARM platform only!")
-  endif()
+if((ARM OR AARCH64) AND (ANDROID OR (UNIX AND NOT APPLE AND NOT IOS AND NOT XROS)))
+  set(the_description       "FastCV extension module")
+  set(FCV_MODULE_HEADER_DIR "${CMAKE_CURRENT_BINARY_DIR}/inc")
+  set(FCV_MODULE_LIB_DIR    "${CMAKE_CURRENT_BINARY_DIR}/libs")
 
   # here you can change the library to a specific one
-  set(FASTCV_LIB "/libs/Android/lib64/libfastcvopt.so")
+  set(FASTCV_LIB "${FCV_MODULE_LIB_DIR}/libfastcvopt.so")
 
+  if((NOT EXISTS ${FCV_MODULE_HEADER_DIR}) OR (NOT EXISTS ${FCV_MODULE_LIB_DIR}))
+    include("${CMAKE_CURRENT_SOURCE_DIR}/fastcv.cmake")
+    download_fastcv("${CMAKE_CURRENT_BINARY_DIR}")
+  endif()
 
-  ocv_module_include_directories("${FASTCV_DIR}/inc")
-  ocv_target_link_libraries(${the_module} LINK_PRIVATE "${FASTCV_DIR}/${FASTCV_LIB}")
+  ocv_define_module(fastcv opencv_core opencv_imgproc opencv_features2d opencv_video WRAP python java)
+  ocv_module_include_directories(
+    "${CMAKE_CURRENT_SOURCE_DIR}/include"
+    ${FCV_MODULE_HEADER_DIR})
+  ocv_target_link_libraries(${the_module} ${FASTCV_LIB})
   ocv_target_compile_definitions(${the_module} PRIVATE FAST_CV_FOUND)
+else()
+  message(FATAL_ERROR "FastCV supports ARM Platform on Android and Linux only!")
 endif()

modules/fastcv/fastcv.cmake

@@ -0,0 +1,35 @@
+function(download_fastcv root_dir)
+
+  # Commit SHA in the opencv_3rdparty repo
+  set(FASTCV_COMMIT "65f40fc8f7a6aac44936ae9538e69edede6c4b15")
+
+  # Define actual FCV versions
+  if(ANDROID)
+    if(AARCH64)
+      set(FCV_PACKAGE_NAME  "fastcv_android_aarch64_2024_10_24.tgz")
+      set(FCV_PACKAGE_HASH  "8a259eea80064643bad20f72ba0b6066")
+    else()
+      set(FCV_PACKAGE_NAME  "fastcv_android_arm32_2024_10_24.tgz")
+      set(FCV_PACKAGE_HASH  "04d89219c44d54166b2b7f8c0ed5143b")
+    endif()
+  elseif(UNIX AND NOT APPLE AND NOT IOS AND NOT XROS)
+    message("FastCV: fastcv lib for Linux is not supported for now!")
+  endif(ANDROID)
+
+  # Download Package
+  set(OPENCV_FASTCV_URL "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${FASTCV_COMMIT}/fastcv/")
+
+  ocv_download( FILENAME        ${FCV_PACKAGE_NAME}
+                HASH            ${FCV_PACKAGE_HASH}
+                URL             ${OPENCV_FASTCV_URL}
+                DESTINATION_DIR ${root_dir}
+                ID              FASTCV
+                STATUS          res
+                UNPACK
+                RELATIVE_URL)
+
+  if(NOT res)
+    message("FastCV: package download failed! Please download FastCV manually and put it at ${root_dir}.")
+  endif()
+
+endfunction()