fix tild decoder initialization

libheif/api/libheif/heif.h

@@ -1634,6 +1634,7 @@ enum heif_chroma_upsampling_algorithm
  heif_chroma_upsampling_bilinear = 2
 };
 
+
 struct heif_color_conversion_options
 {
  // 'version' must be 1.
@@ -1652,7 +1653,8 @@ struct heif_color_conversion_options
  // at the cost of slightly higher computation times.
  uint8_t only_use_preferred_chroma_algorithm;
 
- // --- Note that we cannot extend this struct because it is embedded in other structs (heif_decoding_options and heif_encoding_options).
+ // --- Note that we cannot extend this struct because it is embedded in
+ // other structs (heif_decoding_options and heif_encoding_options).
 };
 
 // Assumes that it is a version=1 struct.

libheif/image-items/image_item.cc

@@ -77,6 +77,15 @@ Error ImageItem::check_resolution(uint32_t w, uint32_t h) const
 }
 
 
+Error ImageItem::init_decoder_from_item(heif_item_id id)
+{
+ m_id = id;
+
+ Error err = on_load_file();
+ return err;
+}
+
+
 heif_compression_format ImageItem::compression_format_from_fourcc_infe_type(uint32_t type)
 {
  switch (type) {
@@ -944,6 +953,11 @@ Result<std::vector<uint8_t>> ImageItem::read_bitstream_configuration_data_overri
  auto item_codec = ImageItem::alloc_for_compression_format(const_cast<HeifContext*>(get_context()), format);
  assert(item_codec);
 
+ Error err = item_codec->init_decoder_from_item(itemId);
+ if (err) {
+ return err;
+ }
+
  return item_codec->read_bitstream_configuration_data(itemId);
 }
 

libheif/image-items/image_item.h

@@ -261,6 +261,8 @@ class ImageItem : public ErrorBuffer
 
  virtual Error on_load_file() { return Error::Ok; }
 
+ Error init_decoder_from_item(heif_item_id id);
+
  Result<std::shared_ptr<HeifPixelImage>> decode_image(const struct heif_decoding_options& options,
  bool decode_tile_only, uint32_t tile_x0, uint32_t tile_y0) const;