From ca9e20a87be6dcc8d9b97841535b2320d2eb2f91 Mon Sep 17 00:00:00 2001
From: Drauthius <albert@diserholt.com>
Date: Sat, 26 Sep 2020 10:40:13 +0200
Subject: [PATCH] Shared webp library

Making optional linking with shared system webp library with
-DUSE_SHARED_WEBP option.
---
 CMakeLists.txt             | 12 +++++++++---
 third_party/CMakeLists.txt |  2 +-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f16f09660d..40065905d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -66,6 +66,7 @@ option(USE_SHARED_TINYXML "Use your installed copy of tinyxml" off)
 option(USE_SHARED_PIXMAN  "Use your installed copy of pixman" off)
 option(USE_SHARED_FREETYPE "Use shared FreeType library" off)
 option(USE_SHARED_HARFBUZZ "Use shared HarfBuzz library" off)
+option(USE_SHARED_WEBP    "Use your installed copy of webp" off)
 option(ENABLE_ASEPRITE_EXE "Compile main Aseprite executable" on)
 option(ENABLE_MEMLEAK      "Enable memory-leaks detector (only for developers)" off)
 option(ENABLE_NEWS         "Enable the news in Home tab" on)
@@ -229,9 +230,17 @@ add_definitions(-DPNG_NO_MMX_CODE) # Do not use MMX optimizations in PNG code
 
 # libwebp
 if(ENABLE_WEBP)
-  set(WEBP_LIBRARIES webp webpdemux libwebpmux)
-  set(WEBP_INCLUDE_DIR ${LIBWEBP_DIR}/src)
-  include_directories(${WEBP_INCLUDE_DIR})
+  if(USE_SHARED_WEBP)
+    find_library(WEBP_LIBRARY NAMES webp)
+    find_library(WEBPDEMUX_LIBRARY NAMES webpdemux)
+    find_library(WEBPMUX_LIBRARY NAMES webpmux)
+    set(WEBP_LIBRARIES ${WEBP_LIBRARY} ${WEBPDEMUX_LIBRARY} ${WEBPMUX_LIBRARY})
+    find_path(WEBP_INCLUDE_DIRS NAMES decode.h PATH_SUFFIXES webp)
+  else()
+    set(WEBP_LIBRARIES webp webpdemux libwebpmux)
+    set(WEBP_INCLUDE_DIR ${LIBWEBP_DIR}/src)
+    include_directories(${WEBP_INCLUDE_DIR})
+  endif()
 endif()
 
 # tinyxml
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index 4839d4097c..e8c3e83cbc 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -32,7 +32,7 @@ if(NOT USE_SHARED_GIFLIB)
   add_subdirectory(giflib)
 endif()
 
-if(ENABLE_WEBP)
+if(ENABLE_WEBP AND NOT USE_SHARED_WEBP)
   set(WEBP_BUILD_EXTRAS OFF CACHE BOOL "Build extras.")
   add_subdirectory(libwebp)
 endif()