Download libimagequant in cmakefile if needed

--HG--
branch : liq
extra : source : de3e993342bc3d4eefe4b638143a7657e0aafe62
extra : histedit_source : 961d951975c5df5b9da5848ce2b04777a2156890%2C12013ded8ac6e49f8af6e757daa1aad8299d3e65

1 files changed, 57 insertions, 0 deletions

diff --git a/cmake/modules/FindLIQ.cmake b/cmake/modules/FindLIQ.cmake
new file mode 100644
index 0000000..ec6fb9b
--- /dev/null
+++ b/cmake/modules/FindLIQ.cmake
@@ -0,0 +1,57 @@
+# Find libimagequant includes and library (and download+build if needed)
+# http://pngquant.org/lib
+#
+# This module defines
+#  LIQ_INCLUDE_DIR, where to find libimagequant.h
+#  LIQ_LIBRARIES, the libraries to link against to use libimagequant.
+#  LIQ_FOUND, If false, do not try to use libimagequant.
+
+SET(LIQ_FOUND "NO")
+
+FIND_PATH(LIQ_INCLUDE_DIR libimagequant.h
+"${PROJECT_SOURCE_DIR}/libimagequant"
+"${PROJECT_SOURCE_DIR}/pngquant/lib"
+/usr/local/include
+/usr/include
+)
+
+FIND_LIBRARY(LIQ_LIBRARY
+  NAMES libimagequant imagequant
+  PATHS "${PROJECT_SOURCE_DIR}/libimagequant" "${PROJECT_SOURCE_DIR}/pngquant/lib" /usr/lib64 /usr/lib /usr/local/lib
+)
+
+IF (LIQ_LIBRARY AND LIQ_INCLUDE_DIR)
+    SET(LIQ_FOUND "YES")
+    SET(LIQ_LIBRARIES ${LIQ_LIBRARY})
+		SET(HAVE_LIBIMAGEQUANT_H 1)
+ENDIF (LIQ_LIBRARY AND LIQ_INCLUDE_DIR)
+
+IF (LIQ_FOUND)
+  IF (NOT LIQ_FIND_QUIETLY)
+    MESSAGE(STATUS "Found LIQ: ${LIQ_LIBRARY} ${LIQ_INCLUDE_DIR}")
+  ENDIF (NOT LIQ_FIND_QUIETLY)
+ELSE (LIQ_FOUND)
+  # if existing library not found, then download and build it
+  IF (NOT WIN32 OR CYGWIN OR MINGW) # MSVC's C compiler is too old to compile libimagequant
+    MESSAGE(STATUS "LIQ will be built")
+    INCLUDE(ExternalProject)
+    EXTERNALPROJECT_ADD(
+        libimagequant
+        URL "http://pngquant.org/libimagequant-2.0.0-src.tar.bz2"
+        SOURCE_DIR libimagequant
+        BUILD_IN_SOURCE 1
+        INSTALL_DIR libimagequant
+        INSTALL_COMMAND true
+        CONFIGURE_COMMAND true
+        BUILD_COMMAND make static
+    )
+
+    SET(LIQ_FOUND "SORTOF")
+    SET(LIQ_BUILD "YES")
+    SET(LIQ_LIBRARIES "${PROJECT_SOURCE_DIR}/libimagequant/libimagequant.a")
+    SET(LIQ_INCLUDE_DIR "${PROJECT_SOURCE_DIR}/libimagequant/")
+    SET(HAVE_LIBIMAGEQUANT_H 1)
+  ENDIF(NOT WIN32 OR CYGWIN OR MINGW)
+ENDIF (LIQ_FOUND)
+
+MARK_AS_ADVANCED(LIQ_INCLUDE_DIR LIQ_LIBRARIES LIQ_BUILD)