wip: write 'tild' image tiles

libheif/api/libheif/heif.cc

@@ -3202,9 +3202,6 @@ struct heif_error heif_context_add_tild_image(struct heif_context* ctx,
     *out_grid_image_handle = new heif_image_handle;
     (*out_grid_image_handle)->image = gridImageResult.value;
     (*out_grid_image_handle)->context = ctx->context;
-
-    printf("heif_context_add_tild_image : handle: %p\n", *out_grid_image_handle);
-    printf("heif_context_add_tild_image : HeifContext::Image : %p\n", gridImageResult.value.get());
   }
 
   return heif_error_success;
@@ -3217,8 +3214,6 @@ struct heif_error heif_context_add_tild_image_tile(struct heif_context* ctx,
                                                    const struct heif_image* image,
                                                    struct heif_encoder* encoder)
 {
-  printf("heif_context_add_tild_image_tile : handle %p\n", tild_image);
-  printf("heif_context_add_tild_image_tile : HeifContext::Image : %p\n", tild_image->image.get());
   Error err = ctx->context->add_tild_image_tile(tild_image->image->get_id(), tile_x, tile_y, image->image, encoder);
   return err.error_struct(ctx->context.get());
 }

libheif/box.cc

@@ -1376,7 +1376,7 @@ Box_iloc::Box_iloc()
 {
   set_short_type(fourcc("iloc"));
 
-  set_use_tmp_file(true);
+  set_use_tmp_file(false);
 }
 
 
@@ -1584,6 +1584,31 @@ Error Box_iloc::append_data(heif_item_id item_ID,
 }
 
 
+Error Box_iloc::replace_data(heif_item_id item_ID,
+                             uint64_t offset,
+                             const std::vector<uint8_t>& data,
+                             uint8_t construction_method)
+{
+  assert(construction_method == 0); // TODO
+  assert(offset == 0); // TODO
+
+  // check whether this item ID already exists
+
+  size_t idx;
+  for (idx = 0; idx < m_items.size(); idx++) {
+    if (m_items[idx].item_ID == item_ID) {
+      break;
+    }
+  }
+
+  assert(idx != m_items.size());
+  assert(m_items[idx].extents[0].data.size() <= data.size()); // TODO
+  memcpy(m_items[idx].extents[0].data.data(), data.data(), data.size());
+
+  return Error::Ok;
+}
+
+
 void Box_iloc::derive_box_version()
 {
   int min_version = m_user_defined_min_version;

libheif/box.h

@@ -220,6 +220,8 @@ class Box : public BoxHeader
 
   void set_output_position(uint64_t pos) { m_output_position = pos; }
 
+  virtual bool is_essential() const { return false; } // only used for properties
+
 protected:
   virtual Error parse(BitstreamRange& range);
 
@@ -463,6 +465,11 @@ class Box_iloc : public FullBox
                     const std::vector<uint8_t>& data,
                     uint8_t construction_method = 0);
 
+  Error replace_data(heif_item_id item_ID,
+                     uint64_t offset,
+                     const std::vector<uint8_t>& data,
+                     uint8_t construction_method);
+
   // append bitstream data that already has been written (before iloc box)
   // Error write_mdat_before_iloc(heif_image_id item_ID,
   //                              std::vector<uint8_t>& data)
@@ -652,6 +659,8 @@ class Box_ispe : public FullBox
 
   bool operator==(const Box& other) const override;
 
+  bool is_essential() const override { return true; }
+
 protected:
   Error parse(BitstreamRange& range) override;