Code snippet how to perform 2 image transformations consequently
How to perform 2 transformations consequentially (rotate 90 degrees->resize), encode raw buffer to jpeg file in memory/decode jpeg file from memory. Privilege http://tizen.org/privilege/mediastorage should be added in manifest.
typedef struct appdata {
//…
int width;
int height;
image_util_rotation_e angle;
media_packet_h mediaPcktPtr;
} appdata_s;
int finalize_callback(media_packet_h packet, int err, void* userdata)
{
return MEDIA_PACKET_FINALIZE;
}
Evas_Event_Flags on_click_rotation_start(void *data, void *event_info)
{
appdata_s *ad = (appdata_s *)data;
void* src_ptr;
media_format_h fmt;
media_packet_h src;
transformation_h handle;
image_util_transform_create(&handle);
unsigned char *img_source = NULL;
int width = 0, height = 0;
unsigned int size_decode = 0;
image_util_decode_jpeg( ad->files[ad->curIndex], (image_util_colorspace_e)IMAGE_UTIL_COLORSPACE_RGB888, &img_source, &width, &height, &size_decode);
ad->width =width;
ad->height =height;
ad->angle = IMAGE_UTIL_ROTATION_90;
media_format_create(&fmt);
media_format_set_video_mime(fmt, MEDIA_FORMAT_RGB888);
media_format_set_video_width(fmt, width);
media_format_set_video_height(fmt, height);
media_packet_create_alloc(fmt, finalize_callback, NULL, &src);
image_util_transform_set_rotation(handle, ad->angle);
media_packet_get_buffer_data_ptr(src, &src_ptr);
memcpy(src_ptr, img_source, size_decode);
free(img_source);
image_util_transform_run(handle, src , (image_util_transform_completed_cb) completed_rotation_callback_start_resize, ad);
ad->mediaPcktPtr = src;
image_util_transform_destroy(handle);
return EVAS_EVENT_FLAG_NONE;
}
static void completed_rotation_callback_start_resize(media_packet_h *dst, int error_code, void *user_data)
{
appdata_s *ad = (appdata_s *)user_data;
void * ptr;
media_packet_get_buffer_data_ptr(*dst, &ptr);
int w = ad->width;
int h = ad->height;
if (ad->angle == IMAGE_UTIL_ROTATION_90 || ad->angle == IMAGE_UTIL_ROTATION_270 )
{
w = ad->height;
h = ad->width;
}
unsigned char* jpeg_memory_buffer;
unsigned int jpeg_size;
image_util_encode_jpeg_to_memory((unsigned char*)ptr, w, h, IMAGE_UTIL_COLORSPACE_RGB888, 100, &jpeg_memory_buffer ,&jpeg_size);
unsigned char *img_buffer = NULL;
int width = 0, height = 0;
unsigned int size_decode = 0;
image_util_decode_jpeg_from_memory(jpeg_memory_buffer, (int)jpeg_size, IMAGE_UTIL_COLORSPACE_RGB888, &img_buffer, &width, &height, &size_decode);
free(jpeg_memory_buffer);
media_packet_destroy(*dst);
media_packet_destroy(ad->mediaPcktPtr);
ad->width =width/4;
ad->height =height/4;
// create next transformation and perform it
media_format_h fmt;
media_packet_h src;
transformation_h handle;
image_util_transform_create(&handle);
media_format_create(&fmt);
media_format_set_video_mime(fmt, MEDIA_FORMAT_RGB888);
media_format_set_video_width(fmt, width);
media_format_set_video_height(fmt, height);
media_packet_create_alloc(fmt, _finalize_callback, NULL, &src);
image_util_transform_set_resolution(handle, ad->width, ad->height);
void* src_ptr;
media_packet_get_buffer_data_ptr(src, &src_ptr);
memcpy(src_ptr, img_buffer, size_decode);
free(img_buffer);
image_util_transform_run(handle, src , (image_util_transform_completed_cb)completed_resize_callback, ad);
ad->mediaPcktPtr = src;
image_util_transform_destroy(handle);
}
static void completed_resize_callback(media_packet_h *dst, int error_code, void *user_data)
{
appdata_s *ad = (appdata_s *)user_data;
void * ptr;
media_packet_get_buffer_data_ptr(*dst, &ptr);
image_util_encode_jpeg((unsigned char*)ptr, ad->width, ad->height
, IMAGE_UTIL_COLORSPACE_RGB888, 100, "/opt/usr/media/rotated_resized.jpg");
media_packet_destroy(*dst);
media_packet_destroy(ad->mediaPcktPtr);
}