Struct gdk_pixbuf::Pixbuf

source ·
#[repr(transparent)]
pub struct Pixbuf { /* private fields */ }
Expand description

A pixel buffer.

Pixbuf contains information about an image’s pixel data, its color space, bits per sample, width and height, and the rowstride (the number of bytes between the start of one row and the start of the next).

Creating new Pixbuf

The most basic way to create a pixbuf is to wrap an existing pixel buffer with a Pixbuf instance. You can use the [ctor@GdkPixbuf.Pixbuf.new_from_data] function to do this.

Every time you create a new Pixbuf instance for some data, you will need to specify the destroy notification function that will be called when the data buffer needs to be freed; this will happen when a Pixbuf is finalized by the reference counting functions. If you have a chunk of static data compiled into your application, you can pass in NULL as the destroy notification function so that the data will not be freed.

The [ctor@GdkPixbuf.Pixbuf.new] constructor function can be used as a convenience to create a pixbuf with an empty buffer; this is equivalent to allocating a data buffer using malloc() and then wrapping it with gdk_pixbuf_new_from_data(). The gdk_pixbuf_new() function will compute an optimal rowstride so that rendering can be performed with an efficient algorithm.

As a special case, you can use the [ctor@GdkPixbuf.Pixbuf.new_from_xpm_data] function to create a pixbuf from inline XPM image data.

You can also copy an existing pixbuf with the Pixbuf::copy() function. This is not the same as just acquiring a reference to the old pixbuf instance: the copy function will actually duplicate the pixel data in memory and create a new Pixbuf instance for it.

Reference counting

Pixbuf structures are reference counted. This means that an application can share a single pixbuf among many parts of the code. When a piece of the program needs to use a pixbuf, it should acquire a reference to it by calling g_object_ref(); when it no longer needs the pixbuf, it should release the reference it acquired by calling g_object_unref(). The resources associated with a Pixbuf will be freed when its reference count drops to zero. Newly-created Pixbuf instances start with a reference count of one.

Image Data

Image data in a pixbuf is stored in memory in an uncompressed, packed format. Rows in the image are stored top to bottom, and in each row pixels are stored from left to right.

There may be padding at the end of a row.

The “rowstride” value of a pixbuf, as returned by [method@GdkPixbuf.Pixbuf.get_rowstride], indicates the number of bytes between rows.

NOTE: If you are copying raw pixbuf data with memcpy() note that the last row in the pixbuf may not be as wide as the full rowstride, but rather just as wide as the pixel data needs to be; that is: it is unsafe to do memcpy (dest, pixels, rowstride * height) to copy a whole pixbuf. Use GdkPixbuf::Pixbuf::copy() instead, or compute the width in bytes of the last row as:

⚠️ The following code is in c ⚠️

last_row = width * ((n_channels * bits_per_sample + 7) / 8);

The same rule applies when iterating over each row of a Pixbuf pixels array.

The following code illustrates a simple put_pixel() function for RGB pixbufs with 8 bits per channel with an alpha channel.

⚠️ The following code is in c ⚠️

static void
put_pixel (GdkPixbuf *pixbuf,
           int x,
       int y,
       guchar red,
       guchar green,
       guchar blue,
       guchar alpha)
{
  int n_channels = gdk_pixbuf_get_n_channels (pixbuf);

  // Ensure that the pixbuf is valid
  g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
  g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
  g_assert (gdk_pixbuf_get_has_alpha (pixbuf));
  g_assert (n_channels == 4);

  int width = gdk_pixbuf_get_width (pixbuf);
  int height = gdk_pixbuf_get_height (pixbuf);

  // Ensure that the coordinates are in a valid range
  g_assert (x >= 0 && x < width);
  g_assert (y >= 0 && y < height);

  int rowstride = gdk_pixbuf_get_rowstride (pixbuf);

  // The pixel buffer in the GdkPixbuf instance
  guchar *pixels = gdk_pixbuf_get_pixels (pixbuf);

  // The pixel we wish to modify
  guchar *p = pixels + y * rowstride + x * n_channels;
  p[0] = red;
  p[1] = green;
  p[2] = blue;
  p[3] = alpha;
}

Loading images

The GdkPixBuf class provides a simple mechanism for loading an image from a file in synchronous and asynchronous fashion.

For GUI applications, it is recommended to use the asynchronous stream API to avoid blocking the control flow of the application.

Additionally, Pixbuf provides the PixbufLoader`] API for progressive image loading.

Saving images

The Pixbuf class provides methods for saving image data in a number of file formats. The formatted data can be written to a file or to a memory buffer. Pixbuf can also call a user-defined callback on the data, which allows to e.g. write the image to a socket or store it in a database.

Implements

gio::prelude::IconExt, gio::prelude::LoadableIconExt

Implementations§

source§

impl Pixbuf

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pub fn new( colorspace: Colorspace, has_alpha: bool, bits_per_sample: i32, width: i32, height: i32 ) -> Option<Pixbuf>

Creates a new Pixbuf structure and allocates a buffer for it.

If the allocation of the buffer failed, this function will return NULL.

The buffer has an optimal rowstride. Note that the buffer is not cleared; you will have to fill it completely yourself.

colorspace

Color space for image

has_alpha

Whether the image should have transparency information

bits_per_sample

Number of bits per color sample

width

Width of image in pixels, must be > 0

height

Height of image in pixels, must be > 0

Returns

A newly-created pixel buffer

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pub fn from_bytes( data: &Bytes, colorspace: Colorspace, has_alpha: bool, bits_per_sample: i32, width: i32, height: i32, rowstride: i32 ) -> Pixbuf

Creates a new #GdkPixbuf out of in-memory readonly image data.

Currently only RGB images with 8 bits per sample are supported.

This is the GBytes variant of gdk_pixbuf_new_from_data(), useful for language bindings.

data

Image data in 8-bit/sample packed format inside a #GBytes

colorspace

Colorspace for the image data

has_alpha

Whether the data has an opacity channel

bits_per_sample

Number of bits per sample

width

Width of the image in pixels, must be > 0

height

Height of the image in pixels, must be > 0

rowstride

Distance in bytes between row starts

Returns

A newly-created pixbuf

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pub fn from_file(filename: impl AsRef<Path>) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from a file.

The file format is detected automatically.

If NULL is returned, then @error will be set. Possible errors are:

  • the file could not be opened
  • there is no loader for the file’s format
  • there is not enough memory to allocate the image buffer
  • the image buffer contains invalid data

The error domains are GDK_PIXBUF_ERROR and G_FILE_ERROR.

filename

Name of file to load, in the GLib file name encoding

Returns

A newly-created pixbuf

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pub fn from_file_at_scale( filename: impl AsRef<Path>, width: i32, height: i32, preserve_aspect_ratio: bool ) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from a file.

The file format is detected automatically.

If NULL is returned, then @error will be set. Possible errors are:

  • the file could not be opened
  • there is no loader for the file’s format
  • there is not enough memory to allocate the image buffer
  • the image buffer contains invalid data

The error domains are GDK_PIXBUF_ERROR and G_FILE_ERROR.

The image will be scaled to fit in the requested size, optionally preserving the image’s aspect ratio.

When preserving the aspect ratio, a width of -1 will cause the image to be scaled to the exact given height, and a height of -1 will cause the image to be scaled to the exact given width. When not preserving aspect ratio, a width or height of -1 means to not scale the image at all in that dimension. Negative values for width and height are allowed since 2.8.

filename

Name of file to load, in the GLib file name encoding

width

The width the image should have or -1 to not constrain the width

height

The height the image should have or -1 to not constrain the height

preserve_aspect_ratio

TRUE to preserve the image’s aspect ratio

Returns

A newly-created pixbuf

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pub fn from_file_at_size( filename: impl AsRef<Path>, width: i32, height: i32 ) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from a file.

The file format is detected automatically.

If NULL is returned, then @error will be set. Possible errors are:

  • the file could not be opened
  • there is no loader for the file’s format
  • there is not enough memory to allocate the image buffer
  • the image buffer contains invalid data

The error domains are GDK_PIXBUF_ERROR and G_FILE_ERROR.

The image will be scaled to fit in the requested size, preserving the image’s aspect ratio. Note that the returned pixbuf may be smaller than width x height, if the aspect ratio requires it. To load and image at the requested size, regardless of aspect ratio, use from_file_at_scale().

filename

Name of file to load, in the GLib file name encoding

width

The width the image should have or -1 to not constrain the width

height

The height the image should have or -1 to not constrain the height

Returns

A newly-created pixbuf

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pub fn from_resource(resource_path: &str) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from an resource.

The file format is detected automatically. If NULL is returned, then @error will be set.

resource_path

the path of the resource file

Returns

A newly-created pixbuf

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pub fn from_resource_at_scale( resource_path: &str, width: i32, height: i32, preserve_aspect_ratio: bool ) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from an resource.

The file format is detected automatically. If NULL is returned, then @error will be set.

The image will be scaled to fit in the requested size, optionally preserving the image’s aspect ratio. When preserving the aspect ratio, a @width of -1 will cause the image to be scaled to the exact given height, and a @height of -1 will cause the image to be scaled to the exact given width. When not preserving aspect ratio, a @width or @height of -1 means to not scale the image at all in that dimension.

The stream is not closed.

resource_path

the path of the resource file

width

The width the image should have or -1 to not constrain the width

height

The height the image should have or -1 to not constrain the height

preserve_aspect_ratio

TRUE to preserve the image’s aspect ratio

Returns

A newly-created pixbuf

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pub fn from_stream( stream: &impl IsA<InputStream>, cancellable: Option<&impl IsA<Cancellable>> ) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from an input stream.

The file format is detected automatically.

If NULL is returned, then error will be set.

The cancellable can be used to abort the operation from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. Other possible errors are in the GDK_PIXBUF_ERROR and G_IO_ERROR domains.

The stream is not closed.

stream

a GInputStream to load the pixbuf from

cancellable

optional GCancellable object, NULL to ignore

Returns

A newly-created pixbuf

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pub fn from_stream_at_scale( stream: &impl IsA<InputStream>, width: i32, height: i32, preserve_aspect_ratio: bool, cancellable: Option<&impl IsA<Cancellable>> ) -> Result<Pixbuf, Error>

Creates a new pixbuf by loading an image from an input stream.

The file format is detected automatically. If NULL is returned, then @error will be set. The @cancellable can be used to abort the operation from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. Other possible errors are in the GDK_PIXBUF_ERROR and G_IO_ERROR domains.

The image will be scaled to fit in the requested size, optionally preserving the image’s aspect ratio.

When preserving the aspect ratio, a width of -1 will cause the image to be scaled to the exact given height, and a height of -1 will cause the image to be scaled to the exact given width. If both width and height are given, this function will behave as if the smaller of the two values is passed as -1.

When not preserving aspect ratio, a width or height of -1 means to not scale the image at all in that dimension.

The stream is not closed.

stream

a GInputStream to load the pixbuf from

width

The width the image should have or -1 to not constrain the width

height

The height the image should have or -1 to not constrain the height

preserve_aspect_ratio

TRUE to preserve the image’s aspect ratio

cancellable

optional GCancellable object, NULL to ignore

Returns

A newly-created pixbuf

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pub fn from_xpm_data(data: &[&str]) -> Pixbuf

Creates a new pixbuf by parsing XPM data in memory.

This data is commonly the result of including an XPM file into a program’s C source.

data

Pointer to inline XPM data.

Returns

A newly-created pixbuf

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pub fn add_alpha( &self, substitute_color: bool, r: u8, g: u8, b: u8 ) -> Option<Pixbuf>

Takes an existing pixbuf and adds an alpha channel to it.

If the existing pixbuf already had an alpha channel, the channel values are copied from the original; otherwise, the alpha channel is initialized to 255 (full opacity).

If substitute_color is TRUE, then the color specified by the (r, g, b) arguments will be assigned zero opacity. That is, if you pass (255, 255, 255) for the substitute color, all white pixels will become fully transparent.

If substitute_color is FALSE, then the (r, g, b) arguments will be ignored.

substitute_color

Whether to set a color to zero opacity.

r

Red value to substitute.

g

Green value to substitute.

b

Blue value to substitute.

Returns

A newly-created pixbuf

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pub fn apply_embedded_orientation(&self) -> Option<Pixbuf>

Takes an existing pixbuf and checks for the presence of an associated “orientation” option.

The orientation option may be provided by the JPEG loader (which reads the exif orientation tag) or the TIFF loader (which reads the TIFF orientation tag, and compensates it for the partial transforms performed by libtiff).

If an orientation option/tag is present, the appropriate transform will be performed so that the pixbuf is oriented correctly.

Returns

A newly-created pixbuf

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pub fn composite( &self, dest: &Pixbuf, dest_x: i32, dest_y: i32, dest_width: i32, dest_height: i32, offset_x: f64, offset_y: f64, scale_x: f64, scale_y: f64, interp_type: InterpType, overall_alpha: i32 )

Creates a transformation of the source image @self by scaling by @scale_x and @scale_y then translating by @offset_x and @offset_y.

This gives an image in the coordinates of the destination pixbuf. The rectangle (@dest_x, @dest_y, @dest_width, @dest_height) is then alpha blended onto the corresponding rectangle of the original destination image.

When the destination rectangle contains parts not in the source image, the data at the edges of the source image is replicated to infinity.

dest

the #GdkPixbuf into which to render the results

dest_x

the left coordinate for region to render

dest_y

the top coordinate for region to render

dest_width

the width of the region to render

dest_height

the height of the region to render

offset_x

the offset in the X direction (currently rounded to an integer)

offset_y

the offset in the Y direction (currently rounded to an integer)

scale_x

the scale factor in the X direction

scale_y

the scale factor in the Y direction

interp_type

the interpolation type for the transformation.

overall_alpha

overall alpha for source image (0..255)

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pub fn composite_color( &self, dest: &Pixbuf, dest_x: i32, dest_y: i32, dest_width: i32, dest_height: i32, offset_x: f64, offset_y: f64, scale_x: f64, scale_y: f64, interp_type: InterpType, overall_alpha: i32, check_x: i32, check_y: i32, check_size: i32, color1: u32, color2: u32 )

Creates a transformation of the source image @self by scaling by @scale_x and @scale_y then translating by @offset_x and @offset_y, then alpha blends the rectangle (@dest_x ,@dest_y, @dest_width, @dest_height) of the resulting image with a checkboard of the colors @color1 and @color2 and renders it onto the destination image.

If the source image has no alpha channel, and @overall_alpha is 255, a fast path is used which omits the alpha blending and just performs the scaling.

See gdk_pixbuf_composite_color_simple() for a simpler variant of this function suitable for many tasks.

dest

the #GdkPixbuf into which to render the results

dest_x

the left coordinate for region to render

dest_y

the top coordinate for region to render

dest_width

the width of the region to render

dest_height

the height of the region to render

offset_x

the offset in the X direction (currently rounded to an integer)

offset_y

the offset in the Y direction (currently rounded to an integer)

scale_x

the scale factor in the X direction

scale_y

the scale factor in the Y direction

interp_type

the interpolation type for the transformation.

overall_alpha

overall alpha for source image (0..255)

check_x

the X offset for the checkboard (origin of checkboard is at -@check_x, -@check_y)

check_y

the Y offset for the checkboard

check_size

the size of checks in the checkboard (must be a power of two)

color1

the color of check at upper left

color2

the color of the other check

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pub fn composite_color_simple( &self, dest_width: i32, dest_height: i32, interp_type: InterpType, overall_alpha: i32, check_size: i32, color1: u32, color2: u32 ) -> Option<Pixbuf>

Creates a new pixbuf by scaling src to dest_width x dest_height and alpha blending the result with a checkboard of colors color1 and color2.

dest_width

the width of destination image

dest_height

the height of destination image

interp_type

the interpolation type for the transformation.

overall_alpha

overall alpha for source image (0..255)

check_size

the size of checks in the checkboard (must be a power of two)

color1

the color of check at upper left

color2

the color of the other check

Returns

the new pixbuf

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pub fn copy(&self) -> Option<Pixbuf>

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pub fn copy_area( &self, src_x: i32, src_y: i32, width: i32, height: i32, dest_pixbuf: &Pixbuf, dest_x: i32, dest_y: i32 )

Copies a rectangular area from src_pixbuf to dest_pixbuf.

Conversion of pixbuf formats is done automatically.

If the source rectangle overlaps the destination rectangle on the same pixbuf, it will be overwritten during the copy operation. Therefore, you can not use this function to scroll a pixbuf.

src_x

Source X coordinate within @self.

src_y

Source Y coordinate within @self.

width

Width of the area to copy.

height

Height of the area to copy.

dest_pixbuf

Destination pixbuf.

dest_x

X coordinate within @dest_pixbuf.

dest_y

Y coordinate within @dest_pixbuf.

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pub fn copy_options(&self, dest_pixbuf: &Pixbuf) -> bool

Copies the key/value pair options attached to a Pixbuf to another Pixbuf.

This is useful to keep original metadata after having manipulated a file. However be careful to remove metadata which you’ve already applied, such as the “orientation” option after rotating the image.

dest_pixbuf

the destination pixbuf

Returns

TRUE on success.

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pub fn fill(&self, pixel: u32)

Clears a pixbuf to the given RGBA value, converting the RGBA value into the pixbuf’s pixel format.

The alpha component will be ignored if the pixbuf doesn’t have an alpha channel.

pixel

RGBA pixel to used to clear (0xffffffff is opaque white, 0x00000000 transparent black)

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pub fn flip(&self, horizontal: bool) -> Option<Pixbuf>

Flips a pixbuf horizontally or vertically and returns the result in a new pixbuf.

horizontal

TRUE to flip horizontally, FALSE to flip vertically

Returns

the new pixbuf

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pub fn bits_per_sample(&self) -> i32

Queries the number of bits per color sample in a pixbuf.

Returns

Number of bits per color sample.

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pub fn byte_length(&self) -> usize

Returns the length of the pixel data, in bytes.

Returns

The length of the pixel data.

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pub fn colorspace(&self) -> Colorspace

Queries the color space of a pixbuf.

Returns

Color space.

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pub fn has_alpha(&self) -> bool

Queries whether a pixbuf has an alpha channel (opacity information).

Returns

TRUE if it has an alpha channel, FALSE otherwise.

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pub fn height(&self) -> i32

Queries the height of a pixbuf.

Returns

Height in pixels.

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pub fn n_channels(&self) -> i32

Queries the number of channels of a pixbuf.

Returns

Number of channels.

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pub fn option(&self, key: &str) -> Option<GString>

Looks up @key in the list of options that may have been attached to the @self when it was loaded, or that may have been attached by another function using gdk_pixbuf_set_option().

For instance, the ANI loader provides “Title” and “Artist” options. The ICO, XBM, and XPM loaders provide “x_hot” and “y_hot” hot-spot options for cursor definitions. The PNG loader provides the tEXt ancillary chunk key/value pairs as options. Since 2.12, the TIFF and JPEG loaders return an “orientation” option string that corresponds to the embedded TIFF/Exif orientation tag (if present). Since 2.32, the TIFF loader sets the “multipage” option string to “yes” when a multi-page TIFF is loaded. Since 2.32 the JPEG and PNG loaders set “x-dpi” and “y-dpi” if the file contains image density information in dots per inch. Since 2.36.6, the JPEG loader sets the “comment” option with the comment EXIF tag.

key

a nul-terminated string.

Returns

the value associated with key

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pub fn rowstride(&self) -> i32

Queries the rowstride of a pixbuf, which is the number of bytes between the start of a row and the start of the next row.

Returns

Distance between row starts.

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pub fn width(&self) -> i32

Queries the width of a pixbuf.

Returns

Width in pixels.

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pub fn new_subpixbuf( &self, src_x: i32, src_y: i32, width: i32, height: i32 ) -> Option<Pixbuf>

Creates a new pixbuf which represents a sub-region of src_pixbuf.

The new pixbuf shares its pixels with the original pixbuf, so writing to one affects both. The new pixbuf holds a reference to src_pixbuf, so src_pixbuf will not be finalized until the new pixbuf is finalized.

Note that if src_pixbuf is read-only, this function will force it to be mutable.

src_x

X coord in @self

src_y

Y coord in @self

width

width of region in @self

height

height of region in @self

Returns

a new pixbuf

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pub fn read_pixel_bytes(&self) -> Option<Bytes>

Provides a #GBytes buffer containing the raw pixel data; the data must not be modified.

This function allows skipping the implicit copy that must be made if gdk_pixbuf_get_pixels() is called on a read-only pixbuf.

Returns

A new reference to a read-only copy of the pixel data. Note that for mutable pixbufs, this function will incur a one-time copy of the pixel data for conversion into the returned #GBytes.

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pub fn remove_option(&self, key: &str) -> bool

Removes the key/value pair option attached to a Pixbuf.

key

a nul-terminated string representing the key to remove.

Returns

TRUE if an option was removed, FALSE if not.

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pub fn rotate_simple(&self, angle: PixbufRotation) -> Option<Pixbuf>

Rotates a pixbuf by a multiple of 90 degrees, and returns the result in a new pixbuf.

If angle is 0, this function will return a copy of src.

angle

the angle to rotate by

Returns

the new pixbuf

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pub fn saturate_and_pixelate( &self, dest: &Pixbuf, saturation: f32, pixelate: bool )

Modifies saturation and optionally pixelates src, placing the result in dest.

The src and dest pixbufs must have the same image format, size, and rowstride.

The src and dest arguments may be the same pixbuf with no ill effects.

If saturation is 1.0 then saturation is not changed. If it’s less than 1.0, saturation is reduced (the image turns toward grayscale); if greater than 1.0, saturation is increased (the image gets more vivid colors).

If pixelate is TRUE, then pixels are faded in a checkerboard pattern to create a pixelated image.

dest

place to write modified version of @self

saturation

saturation factor

pixelate

whether to pixelate

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pub fn scale( &self, dest: &Pixbuf, dest_x: i32, dest_y: i32, dest_width: i32, dest_height: i32, offset_x: f64, offset_y: f64, scale_x: f64, scale_y: f64, interp_type: InterpType )

Creates a transformation of the source image @self by scaling by @scale_x and @scale_y then translating by @offset_x and @offset_y, then renders the rectangle (@dest_x, @dest_y, @dest_width, @dest_height) of the resulting image onto the destination image replacing the previous contents.

Try to use gdk_pixbuf_scale_simple() first; this function is the industrial-strength power tool you can fall back to, if gdk_pixbuf_scale_simple() isn’t powerful enough.

If the source rectangle overlaps the destination rectangle on the same pixbuf, it will be overwritten during the scaling which results in rendering artifacts.

dest

the #GdkPixbuf into which to render the results

dest_x

the left coordinate for region to render

dest_y

the top coordinate for region to render

dest_width

the width of the region to render

dest_height

the height of the region to render

offset_x

the offset in the X direction (currently rounded to an integer)

offset_y

the offset in the Y direction (currently rounded to an integer)

scale_x

the scale factor in the X direction

scale_y

the scale factor in the Y direction

interp_type

the interpolation type for the transformation.

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pub fn scale_simple( &self, dest_width: i32, dest_height: i32, interp_type: InterpType ) -> Option<Pixbuf>

Create a new pixbuf containing a copy of src scaled to dest_width x dest_height.

This function leaves src unaffected.

The interp_type should be GDK_INTERP_NEAREST if you want maximum speed (but when scaling down GDK_INTERP_NEAREST is usually unusably ugly). The default interp_type should be GDK_INTERP_BILINEAR which offers reasonable quality and speed.

You can scale a sub-portion of src by creating a sub-pixbuf pointing into src; see new_subpixbuf().

If dest_width and dest_height are equal to the width and height of src, this function will return an unscaled copy of src.

For more complicated scaling/alpha blending see scale() and composite().

dest_width

the width of destination image

dest_height

the height of destination image

interp_type

the interpolation type for the transformation.

Returns

the new pixbuf

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pub fn set_option(&self, key: &str, value: &str) -> bool

Attaches a key/value pair as an option to a Pixbuf.

If key already exists in the list of options attached to the pixbuf, the new value is ignored and FALSE is returned.

key

a nul-terminated string.

value

a nul-terminated string.

Returns

TRUE on success

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pub fn pixel_bytes(&self) -> Option<Bytes>

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pub fn calculate_rowstride( colorspace: Colorspace, has_alpha: bool, bits_per_sample: i32, width: i32, height: i32 ) -> i32

Calculates the rowstride that an image created with those values would have.

This function is useful for front-ends and backends that want to check image values without needing to create a Pixbuf.

colorspace

Color space for image

has_alpha

Whether the image should have transparency information

bits_per_sample

Number of bits per color sample

width

Width of image in pixels, must be > 0

height

Height of image in pixels, must be > 0

Returns

the rowstride for the given values, or -1 in case of error.

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pub fn formats() -> Vec<PixbufFormat>

Obtains the available information about the image formats supported by GdkPixbuf.

Returns

A list of support image formats.

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pub fn init_modules(path: &str) -> Result<(), Error>

Available on crate feature v2_40 only.

Initalizes the gdk-pixbuf loader modules referenced by the loaders.cache file present inside that directory.

This is to be used by applications that want to ship certain loaders in a different location from the system ones.

This is needed when the OS or runtime ships a minimal number of loaders so as to reduce the potential attack surface of carefully crafted image files, especially for uncommon file types. Applications that require broader image file types coverage, such as image viewers, would be expected to ship the gdk-pixbuf modules in a separate location, bundled with the application in a separate directory from the OS or runtime- provided modules.

path

Path to directory where the loaders.cache is installed

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impl Pixbuf

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pub fn from_mut_slice<T: AsMut<[u8]>>( data: T, colorspace: Colorspace, has_alpha: bool, bits_per_sample: i32, width: i32, height: i32, row_stride: i32 ) -> Pixbuf

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pub fn from_read<R: Read + Send + 'static>(r: R) -> Result<Pixbuf, Error>

Creates a Pixbuf from a type implementing Read (like File).

use std::fs::File;
use gdk_pixbuf::Pixbuf;

let f = File::open("some_file.png").expect("failed to open image");
let pixbuf = Pixbuf::from_read(f).expect("failed to load image");
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pub fn from_stream_async<P: IsA<InputStream>, Q: IsA<Cancellable>, R: FnOnce(Result<Pixbuf, Error>) + 'static>( stream: &P, cancellable: Option<&Q>, callback: R )

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pub fn from_stream_future<P: IsA<InputStream> + Clone + 'static>( stream: &P ) -> Pin<Box<dyn Future<Output = Result<Pixbuf, Error>> + 'static>>

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pub fn from_stream_at_scale_async<P: IsA<InputStream>, Q: IsA<Cancellable>, R: FnOnce(Result<Pixbuf, Error>) + 'static>( stream: &P, width: i32, height: i32, preserve_aspect_ratio: bool, cancellable: Option<&Q>, callback: R )

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pub fn from_stream_at_scale_future<P: IsA<InputStream> + Clone + 'static>( stream: &P, width: i32, height: i32, preserve_aspect_ratio: bool ) -> Pin<Box<dyn Future<Output = Result<Pixbuf, Error>> + 'static>>

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pub unsafe fn pixels(&self) -> &mut [u8]

Returns a mutable slice to the pixbuf’s pixel data.

This function will cause an implicit copy if the pixbuf was created from read-only data.

Please see the section on image data for information about how the pixel data is stored in memory.

Safety

No other reference to this pixbuf’s data must exist when this method is called.

Until you drop the returned reference, you must not call any methods on the pixbuf which may read or write to the data.

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pub fn put_pixel(&self, x: u32, y: u32, red: u8, green: u8, blue: u8, alpha: u8)

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pub fn file_info<T: AsRef<Path>>( filename: T ) -> Option<(PixbufFormat, i32, i32)>

Parses an image file far enough to determine its format and size.

filename

The name of the file to identify.

Returns

A PixbufFormat describing the image format of the file

width

Return location for the width of the image

height

Return location for the height of the image

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pub fn file_info_async<P: IsA<Cancellable>, Q: FnOnce(Result<Option<(PixbufFormat, i32, i32)>, Error>) + 'static, T: AsRef<Path>>( filename: T, cancellable: Option<&P>, callback: Q )

Asynchronously parses an image file far enough to determine its format and size.

For more details see gdk_pixbuf_get_file_info(), which is the synchronous version of this function.

When the operation is finished, @callback will be called in the main thread. You can then call gdk_pixbuf_get_file_info_finish() to get the result of the operation.

filename

The name of the file to identify

cancellable

optional GCancellable object, NULL to ignore

callback

a GAsyncReadyCallback to call when the file info is available

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pub fn file_info_future<T: AsRef<Path> + Clone + 'static>( filename: T ) -> Pin<Box<dyn Future<Output = Result<Option<(PixbufFormat, i32, i32)>, Error>> + 'static>>

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pub fn save_to_bufferv( &self, type_: &str, options: &[(&str, &str)] ) -> Result<Vec<u8>, Error>

Vector version of gdk_pixbuf_save_to_buffer().

Saves pixbuf to a new buffer in format @type_, which is currently “jpeg”, “tiff”, “png”, “ico” or “bmp”.

See GdkPixbuf::Pixbuf::save_to_buffer() for more details.

type_

name of file format.

option_keys

name of options to set

option_values

values for named options

Returns

whether an error was set

buffer

location to receive a pointer to the new buffer.

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pub fn save_to_streamv<P: IsA<OutputStream>, Q: IsA<Cancellable>>( &self, stream: &P, type_: &str, options: &[(&str, &str)], cancellable: Option<&Q> ) -> Result<(), Error>

Saves pixbuf to an output stream.

Supported file formats are currently “jpeg”, “tiff”, “png”, “ico” or “bmp”.

See GdkPixbuf::Pixbuf::save_to_stream() for more details.

stream

a GOutputStream to save the pixbuf to

type_

name of file format

option_keys

name of options to set

option_values

values for named options

cancellable

optional GCancellable object, NULL to ignore

Returns

TRUE if the pixbuf was saved successfully, FALSE if an error was set.

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pub fn save_to_streamv_async<P: IsA<OutputStream>, Q: IsA<Cancellable>, R: FnOnce(Result<(), Error>) + 'static>( &self, stream: &P, type_: &str, options: &[(&str, &str)], cancellable: Option<&Q>, callback: R )

Saves pixbuf to an output stream asynchronously.

For more details see gdk_pixbuf_save_to_streamv(), which is the synchronous version of this function.

When the operation is finished, callback will be called in the main thread.

You can then call gdk_pixbuf_save_to_stream_finish() to get the result of the operation.

stream

a GOutputStream to which to save the pixbuf

type_

name of file format

option_keys

name of options to set

option_values

values for named options

cancellable

optional GCancellable object, NULL to ignore

callback

a GAsyncReadyCallback to call when the pixbuf is saved

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pub fn save_to_streamv_future<P: IsA<OutputStream> + Clone + 'static>( &self, stream: &P, type_: &str, options: &[(&str, &str)] ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + 'static>>

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pub fn savev<T: AsRef<Path>>( &self, filename: T, type_: &str, options: &[(&str, &str)] ) -> Result<(), Error>

Vector version of gdk_pixbuf_save().

Saves pixbuf to a file in type, which is currently “jpeg”, “png”, “tiff”, “ico” or “bmp”.

If @error is set, FALSE will be returned.

See GdkPixbuf::Pixbuf::save() for more details.

filename

name of file to save.

type_

name of file format.

option_keys

name of options to set

option_values

values for named options

Returns

whether an error was set

Trait Implementations§

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impl Clone for Pixbuf

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Pixbuf

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Display for Pixbuf

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Hash for Pixbuf

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fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Pixbuf

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl ParentClassIs for Pixbuf

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impl<OT: ObjectType> PartialEq<OT> for Pixbuf

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fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<OT: ObjectType> PartialOrd<OT> for Pixbuf

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fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl StaticType for Pixbuf

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for Pixbuf

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impl IsA<Icon> for Pixbuf

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impl IsA<LoadableIcon> for Pixbuf

Auto Trait Implementations§

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impl RefUnwindSafe for Pixbuf

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impl !Send for Pixbuf

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impl !Sync for Pixbuf

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impl Unpin for Pixbuf

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impl UnwindSafe for Pixbuf

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Cast for Twhere T: ObjectType,

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fn upcast<T>(self) -> Twhere T: ObjectType, Self: IsA<T>,

Upcasts an object to a superclass or interface T. Read more
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fn upcast_ref<T>(&self) -> &Twhere T: ObjectType, Self: IsA<T>,

Upcasts an object to a reference of its superclass or interface T. Read more
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fn downcast<T>(self) -> Result<T, Self>where T: ObjectType, Self: CanDowncast<T>,

Tries to downcast to a subclass or interface implementor T. Read more
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fn downcast_ref<T>(&self) -> Option<&T>where T: ObjectType, Self: CanDowncast<T>,

Tries to downcast to a reference of its subclass or interface implementor T. Read more
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fn dynamic_cast<T>(self) -> Result<T, Self>where T: ObjectType,

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
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fn dynamic_cast_ref<T>(&self) -> Option<&T>where T: ObjectType,

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
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unsafe fn unsafe_cast<T>(self) -> Twhere T: ObjectType,

Casts to T unconditionally. Read more
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unsafe fn unsafe_cast_ref<T>(&self) -> &Twhere T: ObjectType,

Casts to &T unconditionally. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_num_as_vec( ptr: *const GPtrArray, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_container_num_as_vec( _: *const GPtrArray, _: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_num_as_vec( _: *const GPtrArray, _: usize ) -> Vec<T, Global>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_num_as_vec( ptr: *const GSList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_container_num_as_vec( _: *const GSList, _: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_num_as_vec( _: *const GSList, _: usize ) -> Vec<T, Global>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_num_as_vec( ptr: *mut GList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_container_num_as_vec( ptr: *mut GList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_num_as_vec( ptr: *mut GList, num: usize ) -> Vec<T, Global>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_num_as_vec( ptr: *mut GPtrArray, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_container_num_as_vec( ptr: *mut GPtrArray, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_num_as_vec( ptr: *mut GPtrArray, num: usize ) -> Vec<T, Global>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_num_as_vec( ptr: *mut GSList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_container_num_as_vec( ptr: *mut GSList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_num_as_vec( ptr: *mut GSList, num: usize ) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_as_vec(ptr: *const GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_container_as_vec(_: *const GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(_: *const GPtrArray) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_as_vec(ptr: *mut GList) -> Vec<T, Global>

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unsafe fn from_glib_container_as_vec(ptr: *mut GList) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_container_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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unsafe fn from_glib_container_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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impl<O> IconExt for Owhere O: IsA<Icon>,

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fn equal(&self, icon2: Option<&impl IsA<Icon>>) -> bool

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fn serialize(&self) -> Option<Variant>

Serializes a Icon into a glib::Variant. An equivalent Icon can be retrieved back by calling Icon::deserialize() on the returned value. As serialization will avoid using raw icon data when possible, it only makes sense to transfer the glib::Variant between processes on the same machine, (as opposed to over the network), and within the same file system namespace. Read more
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fn to_string(&self) -> Option<GString>

Generates a textual representation of self that can be used for serialization such as when passing self to a different process or saving it to persistent storage. Use Icon::for_string() to get self back from the returned string. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<U> IsSubclassableExt for Uwhere U: IsClass + ParentClassIs,

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impl<O> LoadableIconExt for Owhere O: IsA<LoadableIcon>,

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fn load( &self, size: i32, cancellable: Option<&impl IsA<Cancellable>> ) -> Result<(InputStream, GString), Error>

Loads a loadable icon. For the asynchronous version of this function, see load_async(). Read more
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fn load_async<P>( &self, size: i32, cancellable: Option<&impl IsA<Cancellable>>, callback: P )where P: FnOnce(Result<(InputStream, GString), Error>) + 'static,

Loads an icon asynchronously. To finish this function, see g_loadable_icon_load_finish(). For the synchronous, blocking version of this function, see load(). Read more
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fn load_future( &self, size: i32 ) -> Pin<Box<dyn Future<Output = Result<(InputStream, GString), Error>> + 'static, Global>>

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impl<T> ObjectExt for Twhere T: ObjectType,

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fn is<U>(&self) -> boolwhere U: StaticType,

Returns true if the object is an instance of (can be cast to) T.
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fn type_(&self) -> Type

Returns the type of the object.
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fn object_class(&self) -> &Class<Object>

Returns the ObjectClass of the object. Read more
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fn class(&self) -> &Class<T>where T: IsClass,

Returns the class of the object.
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fn class_of<U>(&self) -> Option<&Class<U>>where U: IsClass,

Returns the class of the object in the given type T. Read more
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fn interface<U>(&self) -> Option<InterfaceRef<'_, U>>where U: IsInterface,

Returns the interface T of the object. Read more
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fn set_property<V>(&self, property_name: &str, value: V)where V: ToValue,

Sets the property property_name of the object to value value. Read more
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fn set_property_from_value(&self, property_name: &str, value: &Value)

Sets the property property_name of the object to value value. Read more
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fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])

Sets multiple properties of the object at once. Read more
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fn set_properties_from_value(&self, property_values: &[(&str, Value)])

Sets multiple properties of the object at once. Read more
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fn property<V>(&self, property_name: &str) -> Vwhere V: for<'b> FromValue<'b> + 'static,

Gets the property property_name of the object and cast it to the type V. Read more
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fn property_value(&self, property_name: &str) -> Value

Gets the property property_name of the object. Read more
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fn has_property(&self, property_name: &str, type_: Option<Type>) -> bool

Check if the object has a property property_name of the given type_. Read more
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fn property_type(&self, property_name: &str) -> Option<Type>

Get the type of the property property_name of this object. Read more
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fn find_property(&self, property_name: &str) -> Option<ParamSpec>

Get the ParamSpec of the property property_name of this object.
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fn list_properties(&self) -> PtrSlice<ParamSpec>

Return all ParamSpec of the properties of this object.
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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

Freeze all property notifications until the return guard object is dropped. Read more
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unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where QD: 'static,

Set arbitrary data on this object with the given key. Read more
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unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>>where QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more
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unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD>where QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more
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unsafe fn set_data<QD>(&self, key: &str, value: QD)where QD: 'static,

Set arbitrary data on this object with the given key. Read more
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unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>>where QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more
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unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>where QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more
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fn block_signal(&self, handler_id: &SignalHandlerId)

Block a given signal handler. Read more
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fn unblock_signal(&self, handler_id: &SignalHandlerId)

Unblock a given signal handler.
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fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)

Stop emission of the currently emitted signal.
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fn stop_signal_emission_by_name(&self, signal_name: &str)

Stop emission of the currently emitted signal by the (possibly detailed) signal name.
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fn connect<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,

Connect to the signal signal_name on this object. Read more
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fn connect_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,

Connect to the signal signal_id on this object. Read more
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fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,

Connect to the signal signal_name on this object. Read more
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fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,

Connect to the signal signal_id on this object. Read more
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unsafe fn connect_unsafe<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_name on this object. Read more
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unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_id on this object. Read more
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fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_name on this object. Read more
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fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_id on this object. Read more
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fn watch_closure(&self, closure: &impl AsRef<Closure>)

Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures.
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fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by signal id. Read more
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fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>

Same as Self::emit but takes Value for the arguments.
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fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by its name. Read more
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fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>

Emit signal by its name. Read more
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fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by its name with details. Read more
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fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by its name with details. Read more
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fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by signal id with details. Read more
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fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by signal id with details. Read more
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fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,

Connect to the notify signal of the object. Read more
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fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,

Connect to the notify signal of the object. Read more
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unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),

Connect to the notify signal of the object. Read more
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fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
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fn notify_by_pspec(&self, pspec: &ParamSpec)

Notify that the given property has changed its value. Read more
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fn downgrade(&self) -> WeakRef<T>

Downgrade this object to a weak reference.
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fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + Send + 'static,

Add a callback to be notified when the Object is disposed.
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fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + 'static,

Add a callback to be notified when the Object is disposed. Read more
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fn bind_property<'f, 't, O, 'a>( &'a self, source_property: &'a str, target: &'a O, target_property: &'a str ) -> BindingBuilder<'a, 'f, 't>where O: ObjectType,

Bind property source_property on this object to the target_property on the target object. Read more
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fn ref_count(&self) -> u32

Returns the strong reference count of this object.
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unsafe fn run_dispose(&self)

Runs the dispose mechanism of the object. Read more
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impl<T> StaticTypeExt for Twhere T: StaticType,

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fn ensure_type()

Ensures that the type has been registered with the type system.
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impl<T> ToClosureReturnValue for Twhere T: ToValue,

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T> TryFromClosureReturnValue for Twhere T: for<'a> FromValue<'a> + StaticType + 'static,

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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Super, Sub> CanDowncast<Sub> for Superwhere Super: IsA<Super>, Sub: IsA<Super>,

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impl<'a, T, C, E> FromValueOptional<'a> for Twhere T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,