From dbeaafc95605660aedea7014ad4eed0e23ff0142 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Fri, 1 Sep 2023 09:38:51 -0400
Subject: [PATCH] support LERC compression

---
 MagickCore/compress.h |  3 ++-
 MagickCore/option.c   |  1 +
 coders/tiff.c         | 17 +++++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/MagickCore/compress.h b/MagickCore/compress.h
index 194831a08a..0b9b954a2e 100644
--- a/MagickCore/compress.h
+++ b/MagickCore/compress.h
@@ -51,7 +51,8 @@ typedef enum
   DWAACompression,
   DWABCompression,
   BC7Compression,
-  BC5Compression
+  BC5Compression,
+  LERCCompression          /* https://github.com/Esri/lerc */
 } CompressionType;
 
 typedef struct _Ascii85Info
diff --git a/MagickCore/option.c b/MagickCore/option.c
index 87808f2668..f6e468ef0d 100644
--- a/MagickCore/option.c
+++ b/MagickCore/option.c
@@ -1372,6 +1372,7 @@ static const OptionInfo
     { "JBIG2", JBIG2Compression, UndefinedOptionFlag, MagickFalse },
     { "JPEG2000", JPEG2000Compression, UndefinedOptionFlag, MagickFalse },
     { "JPEG", JPEGCompression, UndefinedOptionFlag, MagickFalse },
+    { "LERC", LERCCompression, UndefinedOptionFlag, MagickFalse },
     { "LosslessJPEG", LosslessJPEGCompression, UndefinedOptionFlag, MagickFalse },
     { "Lossless", LosslessJPEGCompression, UndefinedOptionFlag, MagickFalse },
     { "LZMA", LZMACompression, UndefinedOptionFlag, MagickFalse },
diff --git a/coders/tiff.c b/coders/tiff.c
index 706a8f504c..4d193acb73 100644
--- a/coders/tiff.c
+++ b/coders/tiff.c
@@ -1576,6 +1576,9 @@ static Image *ReadTIFFImage(const ImageInfo *image_info,
         break;
       }
       case COMPRESSION_OJPEG: image->compression=JPEGCompression; break;
+#if defined(COMPRESSION_LERC)
+      case COMPRESSION_LERC: image->compression=LERCCompression; break;
+#endif
 #if defined(COMPRESSION_LZMA)
       case COMPRESSION_LZMA: image->compression=LZMACompression; break;
 #endif
@@ -2383,6 +2386,9 @@ ModuleExport size_t RegisterTIFFImage(void)
 #if defined(COMPRESSION_JPEG)
       ", JPEG"
 #endif
+#if defined(COMPRESSION_LERC)
+      ", LERC"
+#endif
 #if defined(COMPRESSION_LZW)
       ", LZW"
 #endif
@@ -3587,6 +3593,13 @@ static MagickBooleanType WriteTIFFImage(const ImageInfo *image_info,
         compress_tag=COMPRESSION_JPEG;
         break;
       }
+#if defined(COMPRESSION_LERC)
+      case LERCCompression:
+      {
+        compress_tag=COMPRESSION_LERC;
+        break;
+      }
+#endif
 #if defined(COMPRESSION_LZMA)
       case LZMACompression:
       {
@@ -3865,6 +3878,10 @@ static MagickBooleanType WriteTIFFImage(const ImageInfo *image_info,
       }
       case COMPRESSION_CCITTFAX4:
         break;
+#if defined(LERC_SUPPORT) && defined(COMPRESSION_LERC)
+      case COMPRESSION_LERC:
+        break;
+#endif
 #if defined(LZMA_SUPPORT) && defined(COMPRESSION_LZMA)
       case COMPRESSION_LZMA:
       {