Thumbnail Images

Tizen allows you to create a thumbnail from an input media file.

The main features of the Thumbnail Util API include:

  • Video and image thumbnails

    You can create thumbnails from video and image files. Thumbnail Util API does not support audio files.

  • Custom size

    You can create the thumbnail of any size.

The API provides the requested thumbnail as raw data or a file.

In case of raw data, if the requested media is a video, thumbnail is RGB colorspace. And if it is an image, thumbnail is BGRA colorspace.

In case of a file, thumbnails are encoded with a user-specified extension.

Note

See thumbnail_util_extract_to_file() for details regarding extensions.

Prerequisites

To enable your application to use the thumbnail util functionality:

  1. To use the functions and data types of the Thumbnail Util API (in mobile and wearable applications), include the <thumbnail_util.h> header file in your application:

    #include <thumbnail_util.h>

  2. Ensure that you have access to the file required to extract the thumbnail.

    This guide uses a JPEG image file, which is accessed through its file path. Include the <storage.h> header file as the example code uses internal storage. The example code is as follows:

    int internal_storage_id;
char *internal_image_storage_path;
char *image_file_name = "test_image.jpg";
char *image_test_path;
char *out_file_name = "result_image.jpg";
char *out_test_path;

static bool
storage_cb(int storage_id, storage_type_e type, storage_state_e state,
           const char *path, void *user_data)
{
    if (type == STORAGE_TYPE_INTERNAL) {
        internal_storage_id = storage_id;

        return false;
    }

    return true;
}

void
_get_internal_storage_path()
{
    int error;
    char *path = NULL;

    error = storage_foreach_device_supported(storage_cb, NULL);
    error = storage_get_directory(internal_storage_id, STORAGE_DIRECTORY_IMAGES, &path);
    if (error != STORAGE_ERROR_NONE) {
        internal_image_storage_path = strdup(path);
        free(path);
    }
}

void
_make_test_path()
{
    int path_len = 0;

    path_len = strlen(internal_image_storage_path) + strlen(image_file_name) + 1;
    image_test_path = malloc(path_len);
    memset(image_test_path, 0x0, path_len);

    strncat(image_test_path, internal_image_storage_path, strlen(internal_image_storage_path));
    strncat(image_test_path, image_file_name, strlen(image_file_name));
    
    strncat(out_test_path, internal_image_storage_path, strlen(internal_image_storage_path));
    strncat(out_test_path, out_file_name, strlen(out_file_name));
}

Note
The Thumbnail Util functions can use both common content in the device storage (internal or external) and private content in your application data.

Extract a Thumbnail

To extract a thumbnail from the file:

  1. To receive the results in a file, use the thumbnail_util_extract_to_file() function:

    ret = thumbnail_util_extract_to_file(image_test_path, 512, 288, out_test_path);

    You find a thumbnail file on out_test_path.

  2. To receive the results in a raw data, use the thumbnail_util_extract_to_buffer() function:

    unsigned char *out_buf;
size_t out_buf_size;
unsigned int out_width;
unsigned int out_height;

ret = thumbnail_util_extract_to_buffer(image_test_path, 512, 288, &out_buf, &out_buf_size, &out_width, &out_height);

    You get a BGRA color image.

Note

Since Tizen 5.5, if the requested width and height of the thumbnail are bigger than the image, then the thumbnail size is changed to the image size.

  • Dependencies
    • Tizen 5.0 and Higher for Mobile
    • Tizen 5.0 and Higher for Wearable
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