libjxl/0001-Remove-LCMS-mutex.patch

From 057cd06c19875bcf8b5d34d41d92a8abdb856b7c Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Fri, 11 Mar 2022 21:11:24 +0100
Subject: [PATCH] Remove LCMS mutex (#112)

* Remove LCMS mutex

Requires mm2/Little-CMS@a35bacd, which is released in LCMS v2.11.

* Use a threadsafe alternative of gmtime in LCMS

Requires mm2/Little-CMS@68ee2ff, which is released in LCMS v2.13.

LCMS submodule was updated to version 2.13.1 instead.
---
 lib/jxl/enc_color_management.cc | 15 ---------------
 third_party/CMakeLists.txt      |  2 +-
 third_party/lcms                |  2 +-
 third_party/lcms2.cmake         | 14 ++++++++++++++
 4 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/lib/jxl/enc_color_management.cc b/lib/jxl/enc_color_management.cc
index 419a2b6b68..0a7e21f3ba 100644
--- a/lib/jxl/enc_color_management.cc
+++ b/lib/jxl/enc_color_management.cc
@@ -18,7 +18,6 @@
 #include <array>
 #include <atomic>
 #include <memory>
-#include <mutex>
 #include <string>
 #include <utility>
 
@@ -307,14 +306,6 @@ int DoColorSpaceTransform(void* t, size_t thread, const float* buf_src,
 // Define to 1 on OS X as a workaround for older LCMS lacking MD5.
 #define JXL_CMS_OLD_VERSION 0
 
-// cms functions (even *THR) are not thread-safe, except cmsDoTransform.
-// To ensure all functions are covered without frequent lock-taking nor risk of
-// recursive lock, we lock in the top-level APIs.
-static std::mutex& LcmsMutex() {
-  static std::mutex m;
-  return m;
-}
-
 #if JPEGXL_ENABLE_SKCMS
 
 JXL_MUST_USE_RESULT CIExy CIExyFromXYZ(const float XYZ[3]) {
@@ -816,9 +807,6 @@ Status ApplyHlgOotf(JxlCms* t, float* JXL_RESTRICT buf, size_t xsize,
 
 }  // namespace
 
-// All functions that call lcms directly (except ColorSpaceTransform::Run) must
-// lock LcmsMutex().
-
 Status ColorEncoding::SetFieldsFromICC() {
   // In case parsing fails, mark the ColorEncoding as invalid.
   SetColorSpace(ColorSpace::kUnknown);
@@ -858,7 +846,6 @@ Status ColorEncoding::SetFieldsFromICC() {
   rendering_intent = static_cast<RenderingIntent>(rendering_intent32);
 #else  // JPEGXL_ENABLE_SKCMS
 
-  std::lock_guard<std::mutex> guard(LcmsMutex());
   const cmsContext context = GetContext();
 
   Profile profile;
@@ -920,7 +907,6 @@ void JxlCmsDestroy(void* cms_data) {
   if (cms_data == nullptr) return;
   JxlCms* t = reinterpret_cast<JxlCms*>(cms_data);
 #if !JPEGXL_ENABLE_SKCMS
-  std::lock_guard<std::mutex> guard(LcmsMutex());
   TransformDeleter()(t->lcms_transform);
 #endif
   delete t;
@@ -957,7 +943,6 @@ void* JxlCmsInit(void* init_data, size_t num_threads, size_t xsize,
     return nullptr;
   }
 #else   // JPEGXL_ENABLE_SKCMS
-  std::lock_guard<std::mutex> guard(LcmsMutex());
   const cmsContext context = GetContext();
   Profile profile_src, profile_dst;
   if (!DecodeProfile(context, c_src.ICC(), &profile_src)) {
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index afefbaa80b..095d5a5430 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -146,7 +146,7 @@ if (JPEGXL_ENABLE_SKCMS OR JPEGXL_ENABLE_PLUGINS)
 endif ()
 if (JPEGXL_ENABLE_VIEWERS OR NOT JPEGXL_ENABLE_SKCMS)
   if( NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/lcms/.git" OR JPEGXL_FORCE_SYSTEM_LCMS2 )
-    find_package(LCMS2 2.10)
+    find_package(LCMS2 2.13)
     if ( NOT LCMS2_FOUND )
       message(FATAL_ERROR "Please install lcms2 or run git submodule update --init")
     endif ()
#diff --git a/third_party/lcms b/third_party/lcms
#index 65c63bf549..233004ae26 160000
#--- a/third_party/lcms
#+++ b/third_party/lcms
#@@ -1 +1 @@
#-Subproject commit 65c63bf549d78253c14b30b3d62cb668bbbe612c
#+Subproject commit 233004ae26b238b2831ff60eea9e753b99d97906
diff --git a/third_party/lcms2.cmake b/third_party/lcms2.cmake
index 906e777305..c33f877659 100644
--- a/third_party/lcms2.cmake
+++ b/third_party/lcms2.cmake
@@ -60,4 +60,18 @@ target_compile_definitions(lcms2
 target_compile_definitions(lcms2
   PUBLIC "-DCMS_NO_REGISTER_KEYWORD=1")
 
+# Ensure that a thread safe alternative of gmtime is used in LCMS
+include(CheckSymbolExists)
+check_symbol_exists(gmtime_r "time.h" HAVE_GMTIME_R)
+if (HAVE_GMTIME_R)
+  target_compile_definitions(lcms2
+    PUBLIC "-DHAVE_GMTIME_R=1")
+else()
+  check_symbol_exists(gmtime_s "time.h" HAVE_GMTIME_S)
+  if (HAVE_GMTIME_S)
+    target_compile_definitions(lcms2
+      PUBLIC "-DHAVE_GMTIME_S=1")
+  endif()
+endif()
+
 set_property(TARGET lcms2 PROPERTY POSITION_INDEPENDENT_CODE ON)