FindSDL: Use SDL_IMAGE prefix for varibales

This makes FindPackageHandleStandardArgs and FeatureSummary work correctly.
Keep old variables for compatibility.
Furthermore, format the documentation.

1 files changed, 40 insertions, 25 deletions

diff --git a/Modules/FindSDL_image.cmake b/Modules/FindSDL_image.cmake
index ae2bc69..d176691 100644
--- a/Modules/FindSDL_image.cmake
+++ b/Modules/FindSDL_image.cmake
@@ -1,9 +1,14 @@
-# Locate SDL_image library
-# This module defines
-# SDLIMAGE_LIBRARY, the name of the library to link against
-# SDLIMAGE_FOUND, if false, do not try to link to SDL
-# SDLIMAGE_INCLUDE_DIR, where to find SDL/SDL.h
-# SDLIMAGE_VERSION_STRING - human-readable string containing the version of SDL_image
+# - Locate SDL_image library
+# This module defines:
+#  SDL_IMAGE_LIBRARIES, the name of the library to link against
+#  SDL_IMAGE_INCLUDE_DIRS, where to find the headers
+#  SDL_IMAGE_FOUND, if false, do not try to link against
+#  SDL_IMAGE_VERSION_STRING - human-readable string containing the version of SDL_image
+#
+# For backward compatiblity the following variables are also set:
+#  SDLIMAGE_LIBRARY (same value as SDL_IMAGE_LIBRARIES)
+#  SDLIMAGE_INCLUDE_DIR (same value as SDL_IMAGE_INCLUDE_DIRS)
+#  SDLIMAGE_FOUND (same value as SDL_IMAGE_FOUND)
 #
 # $SDLDIR is an environment variable that would
 # correspond to the ./configure --prefix=$SDLDIR
@@ -26,7 +31,7 @@
 # (To distribute this file outside of CMake, substitute the full
 #  License text for the above reference.)
 
-find_path(SDLIMAGE_INCLUDE_DIR SDL_image.h
+find_path(SDL_IMAGE_INCLUDE_DIR SDL_image.h
   HINTS
     ENV SDLIMAGEDIR
     ENV SDLDIR
@@ -44,7 +49,7 @@ find_path(SDLIMAGE_INCLUDE_DIR SDL_image.h
   /opt
 )
 
-find_library(SDLIMAGE_LIBRARY
+find_library(SDL_IMAGE_LIBRARY
   NAMES SDL_image
   HINTS
     ENV SDLIMAGEDIR
@@ -59,24 +64,34 @@ find_library(SDLIMAGE_LIBRARY
   /opt
 )
 
-if(SDLIMAGE_INCLUDE_DIR AND EXISTS "${SDLIMAGE_INCLUDE_DIR}/SDL_image.h")
-  file(STRINGS "${SDLIMAGE_INCLUDE_DIR}/SDL_image.h" SDLIMAGE_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+[0-9]+$")
-  file(STRINGS "${SDLIMAGE_INCLUDE_DIR}/SDL_image.h" SDLIMAGE_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+[0-9]+$")
-  file(STRINGS "${SDLIMAGE_INCLUDE_DIR}/SDL_image.h" SDLIMAGE_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+[0-9]+$")
-  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDLIMAGE_VERSION_MAJOR "${SDLIMAGE_VERSION_MAJOR_LINE}")
-  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDLIMAGE_VERSION_MINOR "${SDLIMAGE_VERSION_MINOR_LINE}")
-  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDLIMAGE_VERSION_PATCH "${SDLIMAGE_VERSION_PATCH_LINE}")
-  set(SDLIMAGE_VERSION_STRING ${SDLIMAGE_VERSION_MAJOR}.${SDLIMAGE_VERSION_MINOR}.${SDLIMAGE_VERSION_PATCH})
-  unset(SDLIMAGE_VERSION_MAJOR_LINE)
-  unset(SDLIMAGE_VERSION_MINOR_LINE)
-  unset(SDLIMAGE_VERSION_PATCH_LINE)
-  unset(SDLIMAGE_VERSION_MAJOR)
-  unset(SDLIMAGE_VERSION_MINOR)
-  unset(SDLIMAGE_VERSION_PATCH)
+if(SDL_IMAGE_INCLUDE_DIR AND EXISTS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h")
+  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+[0-9]+$")
+  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+[0-9]+$")
+  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+[0-9]+$")
+  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_MAJOR "${SDL_IMAGE_VERSION_MAJOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_MINOR "${SDL_IMAGE_VERSION_MINOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_PATCH "${SDL_IMAGE_VERSION_PATCH_LINE}")
+  set(SDL_IMAGE_VERSION_STRING ${SDL_IMAGE_VERSION_MAJOR}.${SDL_IMAGE_VERSION_MINOR}.${SDL_IMAGE_VERSION_PATCH})
+  unset(SDL_IMAGE_VERSION_MAJOR_LINE)
+  unset(SDL_IMAGE_VERSION_MINOR_LINE)
+  unset(SDL_IMAGE_VERSION_PATCH_LINE)
+  unset(SDL_IMAGE_VERSION_MAJOR)
+  unset(SDL_IMAGE_VERSION_MINOR)
+  unset(SDL_IMAGE_VERSION_PATCH)
 endif()
 
+set(SDL_IMAGE_LIBRARIES ${SDL_IMAGE_LIBRARY})
+set(SDL_IMAGE_INCLUDE_DIRS ${SDL_IMAGE_INCLUDE_DIR})
+
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDLIMAGE
-                                  REQUIRED_VARS SDLIMAGE_LIBRARY SDLIMAGE_INCLUDE_DIR
-                                  VERSION_VAR SDLIMAGE_VERSION_STRING)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL_image
+                                  REQUIRED_VARS SDL_IMAGE_LIBRARIES SDL_IMAGE_INCLUDE_DIRS
+                                  VERSION_VAR SDL_IMAGE_VERSION_STRING)
+
+# for backward compatiblity
+set(SDLIMAGE_LIBRARY ${SDL_IMAGE_LIBRARIES})
+set(SDLIMAGE_INCLUDE_DIR ${SDL_IMAGE_INCLUDE_DIRS})
+set(SDLIMAGE_FOUND ${SDL_IMAGE_FOUND})
+
+mark_as_advanced(SDL_IMAGE_LIBRARY SDL_IMAGE_INCLUDE_DIR)