CMake/Linux: find Brotli library the proper way

Use a `FindBrotli.cmake` module instead of manually appending library
paths.

This is just for Linux; Windows and macOS will be reviewed separately.

build_files/cmake/Modules/FindBrotli.cmake

@@ -0,0 +1,77 @@
+# - Find Brotli library (compression for freetype/woff2).
+# This module defines
+#  BROTLI_INCLUDE_DIRS, where to find Brotli headers, Set when
+#                       BROTLI_INCLUDE_DIR is found.
+#  BROTLI_LIBRARIES, libraries to link against to use Brotli.
+#  BROTLI_ROOT_DIR, The base directory to search for Brotli.
+#                   This can also be an environment variable.
+#  BROTLI_FOUND, If false, do not try to use Brotli.
+#
+
+#=============================================================================
+# Copyright 2022 Blender Foundation.
+#
+# Distributed under the OSI-approved BSD 3-Clause License,
+# see accompanying file BSD-3-Clause-license.txt for details.
+#=============================================================================
+
+# If BROTLI_ROOT_DIR was defined in the environment, use it.
+IF(NOT BROTLI_ROOT_DIR AND NOT $ENV{BROTLI_ROOT_DIR} STREQUAL "")
+  SET(BROTLI_ROOT_DIR $ENV{BROTLI_ROOT_DIR})
+ENDIF()
+
+SET(_BROTLI_SEARCH_DIRS
+  ${BROTLI_ROOT_DIR}
+)
+
+FIND_PATH(BROTLI_INCLUDE_DIR
+  NAMES
+    brotli/decode.h
+  HINTS
+    ${_BROTLI_SEARCH_DIRS}
+  PATH_SUFFIXES
+    include
+  DOC "Brotli header files"
+)
+
+FIND_LIBRARY(BROTLI_LIBRARY_COMMON
+  NAMES
+    brotlicommon-static
+  HINTS
+    ${_BROTLI_SEARCH_DIRS}
+  PATH_SUFFIXES
+    lib64 lib lib/static
+  DOC "Brotli static common library"
+)
+FIND_LIBRARY(BROTLI_LIBRARY_DEC
+  NAMES
+    brotlidec-static
+  HINTS
+    ${_BROTLI_SEARCH_DIRS}
+  PATH_SUFFIXES
+    lib64 lib lib/static
+  DOC "Brotli static decode library"
+)
+
+
+IF(${BROTLI_LIBRARY_COMMON_NOTFOUND} or ${BROTLI_LIBRARY_DEC_NOTFOUND})
+  set(BROTLI_FOUND FALSE)
+ELSE()
+  # handle the QUIETLY and REQUIRED arguments and set BROTLI_FOUND to TRUE if
+  # all listed variables are TRUE
+  INCLUDE(FindPackageHandleStandardArgs)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(Brotli DEFAULT_MSG BROTLI_LIBRARY_COMMON BROTLI_LIBRARY_DEC BROTLI_INCLUDE_DIR)
+
+  IF(BROTLI_FOUND)
+    get_filename_component(BROTLI_LIBRARY_DIR ${BROTLI_LIBRARY_COMMON} DIRECTORY)
+    SET(BROTLI_INCLUDE_DIRS ${BROTLI_INCLUDE_DIR})
+    SET(BROTLI_LIBRARIES ${BROTLI_LIBRARY_DEC} ${BROTLI_LIBRARY_COMMON})
+  ENDIF()
+ENDIF()
+
+MARK_AS_ADVANCED(
+  BROTLI_INCLUDE_DIR
+  BROTLI_LIBRARY_DIR
+)
+
+UNSET(_BROTLI_SEARCH_DIRS)

build_files/cmake/platform/platform_unix.cmake

@@ -103,10 +103,7 @@ find_package_wrapper(Zstd REQUIRED)
 
 # FreeType compiled with Brotli compression for woff2.
 find_package_wrapper(Freetype REQUIRED)
-list(APPEND FREETYPE_LIBRARIES
-  ${LIBDIR}/brotli/lib/libbrotlidec-static.a
-  ${LIBDIR}/brotli/lib/libbrotlicommon-static.a
-)
+find_package_wrapper(Brotli REQUIRED)
 
 if(WITH_PYTHON)
   # No way to set py35, remove for now.

intern/ghost/test/CMakeLists.txt

@@ -292,7 +292,7 @@ target_link_libraries(multitest_c
   guardedalloc_lib
   wcwidth_lib
   ${OPENGL_gl_LIBRARY}
-  ${FREETYPE_LIBRARIES}
+  ${FREETYPE_LIBRARIES} ${BROTLI_LIBRARIES}
   ${ZLIB_LIBRARIES}
   ${CMAKE_DL_LIBS}
   ${PLATFORM_LINKLIBS}

source/blender/blenfont/CMakeLists.txt

@@ -54,7 +54,7 @@ set(LIB
   bf_gpu
   bf_intern_guardedalloc
 
-  ${FREETYPE_LIBRARIES}
+  ${FREETYPE_LIBRARIES} ${BROTLI_LIBRARIES}
 )
 
 if(WIN32)

source/blender/blenkernel/CMakeLists.txt

@@ -522,7 +522,7 @@ set(LIB
   bf_simulation
 
   # For `vfontdata_freetype.c`.
-  ${FREETYPE_LIBRARIES}
+  ${FREETYPE_LIBRARIES} ${BROTLI_LIBRARIES}
 )
 
 if(WITH_BINRELOC)