Modules/FindPNG.cmake

   1 #
   2 # Find the native PNG includes and library
   3 #
   4
   5 # This module defines
   6 # PNG_INCLUDE_DIR, where to find png.h, etc.
   7 # PNG_LIBRARIES, the libraries to link against to use PNG.
   8 # PNG_DEFINITIONS - You should ADD_DEFINITONS(${PNG_DEFINITIONS}) before compiling code that includes png library files.
   9 # PNG_FOUND, If false, do not try to use PNG.
  10
  11 # also defined, but not for general use are
  12 # PNG_LIBRARY, where to find the PNG library.
  13
  14 # None of the above will be defined unles zlib can be found.
  15
  16 # PNG depends on Zlib
  17 INCLUDE(FindZLIB)
  18
  19 IF(ZLIB_FOUND)
  20   FIND_PATH(PNG_PNG_INCLUDE_DIR png.h
  21   /usr/local/include
  22   /usr/include
  23   )
  24
  25   FIND_LIBRARY(PNG_LIBRARY png
  26   /usr/lib
  27   /usr/local/lib
  28   )
  29
  30   IF (PNG_LIBRARY)
  31     IF (PNG_PNG_INCLUDE_DIR)
  32       # png.h includes zlib.h. Sigh.
  33       SET(PNG_INCLUDE_DIR ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
  34       SET(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
  35       SET(PNG_FOUND "YES")
  36
  37       IF (CYGWIN)
  38         IF(BUILD_SHARED_LIBS)
  39            # No need to define PNG_USE_DLL here, because it's default for Cygwin.
  40         ELSE(BUILD_SHARED_LIBS)
  41           SET (PNG_DEFINITIONS -DPNG_STATIC)
  42         ENDIF(BUILD_SHARED_LIBS)
  43       ENDIF (CYGWIN)
  44
  45     ENDIF (PNG_PNG_INCLUDE_DIR)
  46   ENDIF (PNG_LIBRARY)
  47
  48 ENDIF(ZLIB_FOUND)