Thumbnail-util Sample Overview

The Thumbnail Util sample application demonstrates how to get a custom-size thumbnail image.

The following figure illustrates the main view and structure of the Thumbnail Util application.

Figure: Thumbnail Util main view and structure

Prerequisites

To ensure proper application execution, the following privilege must be set:

• http://tizen.org/privilege/mediastorage

Implementation

To generate a thumbnail:

1. Create a thumbnail using input values in the gen_clicked_cb() function:

   static void 
   gen_clicked_cb(void *data, Evas_Object *obj, void *event_info)
   {
      thumbnail_util_create(&thumb);
      thumbnail_util_set_size(thumb, width, height);
      thumbnail_util_set_path(thumb, full_path);
      ret = thumbnail_util_extract(thumb, thumbnail_completed_cb, NULL, &job_id);
      if (ret != THUMBNAIL_UTIL_ERROR_NONE) 
      {
         // Error handling
      }
   
      thumbnail_util_destroy(thumb);
   }
   

2. Display the created thumbnail.

   When the requested thumbnail creation is completed, the thumbnail_completed_cb() function is invoked.

   You can save the thumbnail to a file, or show it in the window using the returned value. In this example, save the result and display the thumbnail image with returned values.

   {
      if (thumbnail == NULL) 
      {
         thumbnail = elm_image_add(cbox);
         evas_object_size_hint_align_set(thumbnail, EVAS_HINT_FILL, EVAS_HINT_FILL);
         evas_object_size_hint_weight_set(thumbnail, 0.7, EVAS_HINT_EXPAND);
         elm_box_pack_before(cbox, thumbnail, thumbnail_info);
      }
   
      snprintf(file_path, sizeof(file_path), "%s/%s", image_dir, file_name);
      image_util_encode_jpeg(raw_data, raw_width, raw_height, IMAGE_UTIL_COLORSPACE_BGRA8888, 100, file_path);
      elm_image_file_set(thumbnail, file_path, NULL);
      evas_object_show(thumbnail);
   
      snprintf(result, sizeof(result), 
               "<font_size=30><p align=center><b>Thumbnail Info</b></p><br><br> req_id  [%s]<br> width  [%d]<br> height  [%d]<br> size  [%d]</font/>", 
               request_id, raw_width, raw_height, raw_size);
      elm_object_text_set(thumbnail_info, result);
      evas_object_show(thumbnail_info); 
   }