Commit dc003e6b for libheif

commit dc003e6bb3c774975110ef4af193cd0eb4340d58
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Mon Jan 12 21:14:49 2026 +0100

    heif-enc: check that --bit-depth is 9-16 (#1662)

diff --git a/examples/heif_enc.cc b/examples/heif_enc.cc
index 6e8cdcda..65771a83 100644
--- a/examples/heif_enc.cc
+++ b/examples/heif_enc.cc
@@ -295,7 +295,7 @@ void show_help(const char* argv0)
             << "      --no-alpha                 do not save alpha channel\n"
             << "      --no-thumb-alpha           do not save alpha channel in thumbnail image\n"
             << "      --verbose                  enable logging output (more will increase logging level)\n"
-            << "  -b, --bit-depth #              bit-depth of generated HEIF/AVIF file when using 16-bit PNG input (default: 10 bit)\n"
+            << "  -b, --bit-depth #              bit-depth of generated HEIF/AVIF file when using 16-bit PNG input, valid range: 9-16 (default: 10 bit)\n"
             << "      --premultiplied-alpha      input image has premultiplied alpha\n"
 #if WITH_HEADER_COMPRESSION
             << "      --enable-metadata-compression ALGO  enable metadata item compression (experimental)\n"
@@ -1275,6 +1275,10 @@ int main(int argc, char** argv)
         break;
       case 'b':
         output_bit_depth = atoi(optarg);
+        if (output_bit_depth < 9 || output_bit_depth > 16) {
+          std::cerr << "Output bit depth for HDR images must be 9-16 bits.\n";
+          return 5;
+        }
         break;
       case 'A':
         force_enc_av1f = true;