commit f15b3827eaf8fdd119a55b16c40bb4d1ff8d82c1
Author: Stephan Witt <sw...@lyx.org>
Date:   Sat May 13 20:05:39 2017 +0200

    Address bugs #10285 and #10542.
    
    Add sips as a fallback converter for Mac to provide preview of PDF graphics 
in LyX when pdftops is not installed.
    
    (cherry picked from commit c592fb58bb71d750815a909d4180f6e4f3ebf796)
---
 lib/configure.py |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/lib/configure.py b/lib/configure.py
index c478616..955eba0 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -888,6 +888,14 @@ def checkConverterEntries():
     # Only define a converter from pdf6 for graphics
     checkProg('a PDF to EPS converter', ['pdftops -eps -f 1 -l 1 $$i $$o'],
         rc_entry = [ r'\converter pdf6        eps        "%%"  ""' ])
+    # Define a converter from pdf6 to png for Macs where pdftops is missing.
+    # The converter utility sips allows to force the dimensions of the 
resulting
+    # png image. The value of 800 pixel for the width is arbitrary and not
+    # related to the current screen resolution or width.
+    # There is no converter parameter for this information.
+    checkProg('a PDF to PNG converter',
+        ['sips --resampleWidth 800 --setProperty format png $$i --out $$o'],
+        rc_entry = [ r'\converter pdf6        png        "%%" ""' ])
     # Create one converter for a PDF produced using TeX fonts and one for a
     # PDF produced using non-TeX fonts. This does not produce non-unique
     # conversion paths, since a given document either uses TeX fonts or not.

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