Tizen Native API  5.5

image_inheritance_tree.png

An Elementary image object is a direct realization of elm-image-class, and it allows one to load and display an image file on it, be it from a disk file or from a memory region. Exceptionally, one may also load an Edje group as the contents of the image. In this case, though, most of the functions of the image API will act as a no-op.

One can tune various properties of the image, like:

  • pre-scaling,
  • smooth scaling,
  • orientation,
  • aspect ratio during resizes, etc.

An image object may also be made valid source and destination for drag and drop actions, through the elm_image_editable_set() call.

If the image source size is bigger than maximum texture size of the GPU (or also of the software rendering code too), evas can't render it because of such a limitation. If evas just magically always downscales on load if it's too big, then the user has a new bug: "the image is blurry". Potentially any image can cause issue. What if the image is too big to allocate memory for it? A 30000x30000 image will need just a bit under 4GB of RAM to store it. Texture size limitations are something every game developer has to deal with game engines, OpenGL, D3D etc. You can get the maximum image size evas can possibly handle by the calling evas_image_max_size_get() function. If the image size is bigger than this, you can try using load options to pre-scale down on load to lower quality. So use the elm_image_prescale_set() function to scale the image down. Another option is to use the Photocam widget. Photocam solves this issue by loading the prices as needed asynchronously in tiles and automatically using pre-scaling as well So use Photocam if you expect to load very large images.

Signals that you can add callbacks for are:

  • "drop" - This is called when a user has dropped an image typed object onto the object in question -- the event info argument is the path to that image file
  • "clicked" - This is called when a user has clicked the image
  • "download,start" - This is called when the remote image file download has started.
  • "download,progress" - This is continuously called before the remote image file download has done. The event info data is of type Elm_Image_Progress.
  • "download,done" - This is called when the download has completed.
  • "download,error"- This is called when the download has failed.
  • "load,open" - Triggered when the file has been opened, if async open is enabled (image size is known). (since 1.19)
  • "load,ready" - Triggered when the image file is ready for display, if preload is enabled. (since 1.19)
  • "load,error" - Triggered if an async I/O or decoding error occurred, if async open or preload is enabled (since 1.19)
  • "load,cancel" - Triggered whenever async I/O was cancelled. (since 1.19)

An example of usage for this API follows:

Functions

Evas_Objectelm_image_add (Evas_Object *parent)
Eina_Bool elm_image_file_set (Evas_Object *obj, const char *file, const char *group)
void elm_image_file_get (const Eo *obj, const char **file, const char **group)
void elm_image_prescale_set (Evas_Object *obj, int size)
int elm_image_prescale_get (const Evas_Object *obj)
Eina_Bool elm_image_mmap_set (Evas_Object *obj, const Eina_File *file, const char *group)
void elm_image_smooth_set (Evas_Object *obj, Eina_Bool smooth)
 Control the smooth effect for an image.
Eina_Bool elm_image_smooth_get (const Evas_Object *obj)
 Get the smooth effect for an image.
void elm_image_animated_play_set (Evas_Object *obj, Eina_Bool play)
Eina_Bool elm_image_animated_play_get (const Evas_Object *obj)
void elm_image_animated_set (Evas_Object *obj, Eina_Bool anim)
Eina_Bool elm_image_animated_get (const Evas_Object *obj)
Eina_Bool elm_image_animated_available_get (const Evas_Object *obj)
void elm_image_editable_set (Evas_Object *obj, Eina_Bool set)
 Contrtol if the image is 'editable'.
Eina_Bool elm_image_editable_get (const Evas_Object *obj)
 Contrtol if the image is 'editable'.
Eina_Bool elm_image_memfile_set (Evas_Object *obj, const void *img, size_t size, const char *format, const char *key)
 Set a location in memory to be used as an image object's source bitmap.
void elm_image_fill_outside_set (Evas_Object *obj, Eina_Bool fill_outside)
 Control if the image fills the entire object area, when keeping the aspect ratio.
Eina_Bool elm_image_fill_outside_get (const Evas_Object *obj)
 Control if the image fills the entire object area, when keeping the aspect ratio.
void elm_image_preload_disabled_set (Evas_Object *obj, Eina_Bool disabled)
 Enable or disable preloading of the image.
void elm_image_orient_set (Evas_Object *obj, Elm_Image_Orient orient)
 Contrtol the image orientation.
Elm_Image_Orient elm_image_orient_get (const Evas_Object *obj)
 Contrtol the image orientation.
Evas_Objectelm_image_object_get (const Evas_Object *obj)
 Get the inlined image object of the image widget.
void elm_image_object_size_get (const Evas_Object *obj, int *w, int *h)
 Get the current size of the image.
void elm_image_resizable_set (Evas_Object *obj, Eina_Bool up, Eina_Bool down)
 Control if the object is (up/down) resizable.
void elm_image_resizable_get (const Evas_Object *obj, Eina_Bool *up, Eina_Bool *down)
 Control if the object is (up/down) resizable.
void elm_image_no_scale_set (Evas_Object *obj, Eina_Bool no_scale)
 Control scaling behaviour of this object.
Eina_Bool elm_image_no_scale_get (const Evas_Object *obj)
 Control scaling behaviour of this object.
void elm_image_aspect_fixed_set (Evas_Object *obj, Eina_Bool fixed)
 Control whether the internal image's aspect ratio is fixed to the original image's aspect ratio.
Eina_Bool elm_image_aspect_fixed_get (const Evas_Object *obj)
 Get whether the internal image's aspect ratio is fixed to the original image's.

Typedefs

typedef struct _Elm_Image_Progress Elm_Image_Progress
typedef struct _Elm_Image_Error Elm_Image_Error
typedef enum _Elm_Image_Orient_Type Elm_Image_Orient

Typedef Documentation

Structure associated with smart callback 'download,progress'.

Since (EFL) :
1.8

Using Evas_Image_Orient enums.

Since (EFL) :
1.14

Structure associated with smart callback 'download,progress'.

Since (EFL) :
1.8

Enumeration Type Documentation

Using Evas_Image_Orient enums.

Since (EFL) :
1.14
Enumerator:
ELM_IMAGE_ORIENT_NONE 

no orientation change

ELM_IMAGE_ORIENT_0 

no orientation change

ELM_IMAGE_ROTATE_90 

rotate 90 degrees clockwise

ELM_IMAGE_ORIENT_90 

rotate 90 degrees clockwise

ELM_IMAGE_ROTATE_180 

rotate 180 degrees clockwise

ELM_IMAGE_ORIENT_180 

rotate 180 degrees clockwise

ELM_IMAGE_ROTATE_270 

rotate 90 degrees counter-clockwise (i.e. 270 degrees clockwise)

ELM_IMAGE_ORIENT_270 

rotate 90 degrees counter-clockwise (i.e. 270 degrees clockwise)

ELM_IMAGE_FLIP_HORIZONTAL 

flip image horizontally (along the x = width / 2 line)

ELM_IMAGE_FLIP_VERTICAL 

flip image vertically (along the y = height / 2 line)

ELM_IMAGE_FLIP_TRANSPOSE 

flip image along the y = (width - x) line (bottom-left to top-right)

ELM_IMAGE_FLIP_TRANSVERSE 

flip image along the y = x line (top-left to bottom-right)


Function Documentation

Add a new image to the parent.

Parameters:
parentThe parent object
Returns:
The new object or NULL if it cannot be created
See also:
elm_image_file_set()
Since :
2.3.1
Examples:
image_example_01.c.

Get whether an image object supports animation or not.

Returns:
EINA_TRUE if the image supports animation, EINA_FALSE otherwise.

This function returns if this Elementary image object's internal image can be animated. Currently Evas only supports GIF animation. If the return value is EINA_FALSE, other elm_image_animated_xxx API calls won't work.

See also:
elm_image_animated_set()
Since (EFL) :
1.7
Since :
2.3.1

Get whether an image object has animation enabled or not.

Parameters:
objThe image object
Returns:
EINA_TRUE if the image has animation enabled, EINA_FALSE otherwise.
See also:
elm_image_animated_set()
Since (EFL) :
1.7
Since :
2.3.1

Get whether an image object is under animation or not.

Parameters:
objThe image object
Returns:
EINA_TRUE, if the image is being animated, EINA_FALSE otherwise.
See also:
elm_image_animated_play_get()
Since (EFL) :
1.7
Since :
2.3.1

Start or stop an image object's animation.

To actually start playing any image object's animation, if it supports it, one must do something like:

elm_image_animated_set() will enable animation on the image, but not start it yet. This is the function one uses to start and stop animations on image objects.

See also:
elm_image_animated_available_get()
elm_image_animated_set()
elm_image_animated_play_get()
Since (EFL) :
1.7
Parameters:
objThe image object
[in]playEINA_TRUE to start the animation, EINA_FALSE otherwise. Default is EINA_FALSE.
Since :
2.3.1
void elm_image_animated_set ( Evas_Object obj,
Eina_Bool  anim 
)

Set whether an image object (which supports animation) is to animate itself or not.

An image object, even if it supports animation, will be displayed by default without animation. Call this function with animated set to EINA_TRUE to enable its animation. To start or stop the animation, actually, use elm_image_animated_play_set().

See also:
elm_image_animated_get()
elm_image_animated_available_get()
elm_image_animated_play_set()
Since (EFL) :
1.7
Parameters:
objThe image object
[in]animEINA_TRUE if the object is to animate itself, EINA_FALSE otherwise. Default is EINA_FALSE.
Since :
2.3.1

Get whether the internal image's aspect ratio is fixed to the original image's.

Returns:
@ true if the aspect ratio is fixed
Since :
2.3.1
void elm_image_aspect_fixed_set ( Evas_Object obj,
Eina_Bool  fixed 
)

Control whether the internal image's aspect ratio is fixed to the original image's aspect ratio.

Parameters:
[in]fixed@ true if the aspect ratio is fixed
Since :
2.3.1
Examples:
image_example_01.c.

Contrtol if the image is 'editable'.

This means the image is a valid drag target for drag and drop, and can be cut or pasted too.

Returns:
Turn on or off editability. Default is false.
Since :
2.3.1
void elm_image_editable_set ( Evas_Object obj,
Eina_Bool  set 
)

Contrtol if the image is 'editable'.

This means the image is a valid drag target for drag and drop, and can be cut or pasted too.

Parameters:
[in]setTurn on or off editability. Default is false.
Since :
2.3.1
Examples:
image_example_01.c.
void elm_image_file_get ( const Eo *  obj,
const char **  file,
const char **  group 
)

Get the file that will be used as image.

See also:
elm_image_file_set()
Parameters:
[out]fileThe path to file that will be used as image source
[out]groupThe group that the image belongs to, in case it's an EET (including Edje case) file. This can be used as a key inside evas image cache if this is a normal image file not eet file.
Since :
2.3.1
Examples:
icon_example_01.c.
Eina_Bool elm_image_file_set ( Evas_Object obj,
const char *  file,
const char *  group 
)

Set the file that will be used as the image's source.

Parameters:
objThe image object
fileThe path to file that will be used as image source
groupThe group that the image belongs to, in case it's an EET (including Edje case) file. This can be used as a key inside evas image cache if this is a normal image file not eet file.
Returns:
(EINA_TRUE = success, EINA_FALSE = error)
See also:
elm_image_file_get()
Note:
This function will trigger the Edje file case based on the extension of the file string (expects ".edj", for this case).
If you use animated gif image and create multiple image objects with one gif image file, you should set the group differently for each object. Or image objects will share one evas image cache entry and you will get unwanted frames.
Since :
2.3.1
Examples:
image_example_01.c, map_example_02.c, popup_example_02.c, popup_example_03.c, progressbar_example.c, transit_example_03.c, transit_example_04.c, and win_example.c.

Control if the image fills the entire object area, when keeping the aspect ratio.

When the image should keep its aspect ratio even if resized to another aspect ratio, there are two possibilities to resize it: keep the entire image inside the limits of height and width of the object ($fill_outside is false) or let the extra width or height go outside of the object, and the image will fill the entire object ($fill_outside is true).

Note:
This option will have no effect if elm_image_aspect_fixed_get is set to false.
Returns:
true if the object is filled outside, false otherwise. Default is false.
Since :
2.3.1
void elm_image_fill_outside_set ( Evas_Object obj,
Eina_Bool  fill_outside 
)

Control if the image fills the entire object area, when keeping the aspect ratio.

When the image should keep its aspect ratio even if resized to another aspect ratio, there are two possibilities to resize it: keep the entire image inside the limits of height and width of the object ($fill_outside is false) or let the extra width or height go outside of the object, and the image will fill the entire object ($fill_outside is true).

Note:
This option will have no effect if elm_image_aspect_fixed_get is set to false.
Parameters:
[in]fill_outsidetrue if the object is filled outside, false otherwise. Default is false.
Since :
2.3.1
Examples:
icon_example_01.c, and image_example_01.c.
Eina_Bool elm_image_memfile_set ( Evas_Object obj,
const void *  img,
size_t  size,
const char *  format,
const char *  key 
)

Set a location in memory to be used as an image object's source bitmap.

This function is handy when the contents of an image file are mapped in memory, for example.

The format string should be something like $"png", $"jpg", $"tga", $"tiff", $"bmp" etc, when provided ($NULL, on the contrary). This improves the loader performance as it tries the "correct" loader first, before trying a range of other possible loaders until one succeeds.

Parameters:
[in]imgThe binary data that will be used as image source
[in]sizeThe size of binary data blob img
[in]format(Optional) expected format of img bytes
[in]keyOptional indexing key of img to be passed to the image loader (eg. if img is a memory-mapped EET file)
Returns:
true = success, false = error
Since (EFL) :
1.7
Since :
2.3.1
Eina_Bool elm_image_mmap_set ( Evas_Object obj,
const Eina_File file,
const char *  group 
)

Set the file that will be used as the image's source.

Parameters:
objThe image object
fileThe handler to an Eina_File that will be used as image source
groupThe group that the image belongs to, in case it's an EET (including Edje case) file. This can be used as a key inside evas image cache if this is a normal image file not eet file.
Returns:
(EINA_TRUE = success, EINA_FALSE = error)
See also:
elm_image_file_set()
Note:
This function will trigger the Edje file case based on the extension of the file string use to create the Eina_File (expects ".edj", for this case).
If you use animated gif image and create multiple image objects with one gif image file, you should set the group differently for each object. Or image objects will share one evas image cache entry and you will get unwanted frames.
Since :
3.0f(2.3.1)

Control scaling behaviour of this object.

This function disables scaling of the elm_image widget through the function elm_object_scale_set(). However, this does not affect the widget size/resize in any way. For that effect, take a look at elm_image_resizable_get and efl_gfx_entity_scale_get

Returns:
true if the object is not scalable, false otherwise. Default is false.
Since :
2.3.1
void elm_image_no_scale_set ( Evas_Object obj,
Eina_Bool  no_scale 
)

Control scaling behaviour of this object.

This function disables scaling of the elm_image widget through the function elm_object_scale_set(). However, this does not affect the widget size/resize in any way. For that effect, take a look at elm_image_resizable_get and efl_gfx_entity_scale_get

Parameters:
[in]no_scaletrue if the object is not scalable, false otherwise. Default is false.
Since :
2.3.1
Examples:
icon_example_01.c, image_example_01.c, and win_example.c.

Get the inlined image object of the image widget.

This function allows one to get the underlying Evas_Object of type Image from this elementary widget. It can be useful to do things like get the pixel data, save the image to a file, etc.

Note:
Be careful to not manipulate it, as it is under control of elementary.
Warning:
It doesn't guarantee the inlined object must be a type of Evas_Object_Image. It would be one of Evas_Object_Image or Edje_Object depending on image file type.
Returns:
The inlined image object, or NULL if none exists
Since :
2.3.1
void elm_image_object_size_get ( const Evas_Object obj,
int *  w,
int *  h 
)

Get the current size of the image.

This is the real size of the image, not the size of the object.

Parameters:
[out]wPointer to store width, or NULL.
[out]hPointer to store height, or NULL.
Since :
2.3.1

Contrtol the image orientation.

This function allows to rotate or flip the given image.

Returns:
The image orientation Elm.Image.Orient Default is ELM_IMAGE_ORIENT_NONE.
Since :
2.3.1
void elm_image_orient_set ( Evas_Object obj,
Elm_Image_Orient  orient 
)

Contrtol the image orientation.

This function allows to rotate or flip the given image.

Parameters:
[in]orientThe image orientation Elm.Image.Orient Default is ELM_IMAGE_ORIENT_NONE.
Since :
2.3.1
Examples:
image_example_01.c.
void elm_image_preload_disabled_set ( Evas_Object obj,
Eina_Bool  disabled 
)

Enable or disable preloading of the image.

Parameters:
[in]disabledIf true, preloading will be disabled
Since :
2.3.1
int elm_image_prescale_get ( const Evas_Object obj)

Get the prescale size for the image

Parameters:
objThe image object
Returns:
The prescale size
See also:
elm_image_prescale_set()
Since :
2.3.1
void elm_image_prescale_set ( Evas_Object obj,
int  size 
)

Set the prescale size for the image

Parameters:
objThe image object
sizeThe prescale size. This value is used for both width and height.

This function sets a new size for pixmap representation of the given image. It allows the image to be loaded already in the specified size, reducing the memory usage and load time when loading a big image with load size set to a smaller size.

It's equivalent to the elm_bg_load_size_set() function for bg.

Note:
this is just a hint, the real size of the pixmap may differ depending on the type of image being loaded, being bigger than requested.
See also:
elm_image_prescale_get()
elm_bg_load_size_set()
Since :
2.3.1
void elm_image_resizable_get ( const Evas_Object obj,
Eina_Bool up,
Eina_Bool down 
)

Control if the object is (up/down) resizable.

This function limits the image resize ability. If size_up is set to false, the object can't have its height or width resized to a value higher than the original image size. Same is valid for size_down.

Parameters:
[out]upA bool to set if the object is resizable up. Default is true.
[out]downA bool to set if the object is resizable down. Default is true.
Since :
2.3.1
void elm_image_resizable_set ( Evas_Object obj,
Eina_Bool  up,
Eina_Bool  down 
)

Control if the object is (up/down) resizable.

This function limits the image resize ability. If size_up is set to false, the object can't have its height or width resized to a value higher than the original image size. Same is valid for size_down.

Parameters:
[in]upA bool to set if the object is resizable up. Default is true.
[in]downA bool to set if the object is resizable down. Default is true.
Since :
2.3.1
Examples:
ctxpopup_example_01.c, icon_example_01.c, image_example_01.c, list_example_03.c, mapbuf_example.c, slider_example.c, and win_example.c.

Get the smooth effect for an image.

Get the scaling algorithm to be used when scaling the image. Smooth scaling provides a better resulting image, but is slower.

The smooth scaling should be disabled when making animations that change the image size, since it will be faster. Animations that don't require resizing of the image can keep the smooth scaling enabled (even if the image is already scaled, since the scaled image will be cached).

Returns:
true if smooth scaling should be used, false otherwise. Default is true.
Since :
2.3.1
void elm_image_smooth_set ( Evas_Object obj,
Eina_Bool  smooth 
)

Control the smooth effect for an image.

Set the scaling algorithm to be used when scaling the image. Smooth scaling provides a better resulting image, but is slower.

The smooth scaling should be disabled when making animations that change the image size, since it will be faster. Animations that don't require resizing of the image can keep the smooth scaling enabled (even if the image is already scaled, since the scaled image will be cached).

Parameters:
[in]smoothtrue if smooth scaling should be used, false otherwise. Default is true.
Since :
2.3.1
Examples:
icon_example_01.c, and image_example_01.c.