From cc1d4c1a6d7521e366f4b948262e5687df8ad93e Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Tue, 1 Jan 2019 21:01:51 +0000
Subject: [PATCH] Expose palette-bit-depth metadata, requires upcoming libvips
 v8.8.0

---
 src/metadata.cc | 6 ++++++
 src/metadata.h  | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/src/metadata.cc b/src/metadata.cc
index 394209f2..efd91214 100644
--- a/src/metadata.cc
+++ b/src/metadata.cc
@@ -68,6 +68,9 @@ class MetadataWorker : public Nan::AsyncWorker {
       if (image.get_typeof("interlaced") == G_TYPE_INT) {
         baton->isProgressive = image.get_int("interlaced") == 1;
       }
+      if (image.get_typeof("palette-bit-depth") == G_TYPE_INT) {
+        baton->paletteBitDepth = image.get_int("palette-bit-depth");
+      }
       baton->hasProfile = sharp::HasProfile(image);
       // Derived attributes
       baton->hasAlpha = sharp::HasAlpha(image);
@@ -140,6 +143,9 @@ class MetadataWorker : public Nan::AsyncWorker {
           New<v8::String>(baton->chromaSubsampling).ToLocalChecked());
       }
       Set(info, New("isProgressive").ToLocalChecked(), New<v8::Boolean>(baton->isProgressive));
+      if (baton->paletteBitDepth > 0) {
+        Set(info, New("paletteBitDepth").ToLocalChecked(), New<v8::Uint32>(baton->paletteBitDepth));
+      }
       Set(info, New("hasProfile").ToLocalChecked(), New<v8::Boolean>(baton->hasProfile));
       Set(info, New("hasAlpha").ToLocalChecked(), New<v8::Boolean>(baton->hasAlpha));
       if (baton->orientation > 0) {
diff --git a/src/metadata.h b/src/metadata.h
index 6907b182..d279e433 100644
--- a/src/metadata.h
+++ b/src/metadata.h
@@ -33,6 +33,7 @@ struct MetadataBaton {
   int density;
   std::string chromaSubsampling;
   bool isProgressive;
+  int paletteBitDepth;
   bool hasProfile;
   bool hasAlpha;
   int orientation;
@@ -53,6 +54,7 @@ struct MetadataBaton {
     channels(0),
     density(0),
     isProgressive(false),
+    paletteBitDepth(0),
     hasProfile(false),
     hasAlpha(false),
     orientation(0),