From 2eea5d5856b2da04634ff93887126107117da1b2 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Thu, 8 Nov 2018 17:23:27 +0000
Subject: [PATCH] Support of macOS 10.14 Mojave: better implementation of the
 Cairo-FLTK interface.

This implementation puts all code related to Cairo support under Mojave in
the Cairo-specific source file cairo/Fl_Cairo.cxx, which is preferable.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@13116 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 cairo/Fl_Cairo.cxx | 7 +++++++
 src/Fl_cocoa.mm    | 7 -------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/cairo/Fl_Cairo.cxx b/cairo/Fl_Cairo.cxx
index 6207d3c2e..f627c1caa 100644
--- a/cairo/Fl_Cairo.cxx
+++ b/cairo/Fl_Cairo.cxx
@@ -106,6 +106,13 @@ static cairo_surface_t * cairo_create_surface(void * gc, int W, int H) {
 # elif   defined(WIN32)
     return cairo_win32_surface_create((HDC) gc);
 # elif defined(__APPLE_QUARTZ__)
+    CGAffineTransform mat = CGContextGetCTM((CGContextRef)gc);
+    if (mat.d > 0) { // necessary for layer-backed Cairo windows
+      CGContextRestoreGState((CGContextRef)gc);
+      CGContextRestoreGState((CGContextRef)gc);
+      CGContextSaveGState((CGContextRef)gc);
+      CGContextSaveGState((CGContextRef)gc);
+    }
     return cairo_quartz_surface_create_for_cg_context((CGContext*) gc, W, H);
 # else
 #  error Cairo is not supported under this platform.
diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 1c2342c21..d5e3804aa 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -3537,13 +3537,6 @@ void Fl_Window::make_current()
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
   if (views_use_CA) {
     i->gc = ((FLView*)[fl_window contentView])->layer_gc;
-#  ifdef FLTK_HAVE_CAIRO
-    // make sure the GC starts with an identity transformation matrix as do native Cocoa GC's
-    CGAffineTransform mat = CGContextGetCTM(i->gc);
-    if (!CGAffineTransformIsIdentity(mat)) { // 10.4
-      CGContextConcatCTM(i->gc, CGAffineTransformInvert(mat));
-    }
-#  endif
   } else
 #endif
   {