Struct gdk::Visual[][src]

pub struct Visual(_);
Expand description

A Visual contains information about a particular visual.

Implementations

Returns the number of significant bits per red, green and blue value.

Not all GDK backend provide a meaningful value for this function.

Deprecated since 3.22

Use red_pixel_details() and its variants to learn about the pixel layout of TrueColor and DirectColor visuals

Returns

The number of significant bits per color value for self.

Obtains values that are needed to calculate blue pixel values in TrueColor and DirectColor. The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the “mask”). Finally, “precision” refers to how much precision the pixel value contains for a particular primary.

Returns

mask

A pointer to a guint32 to be filled in, or None

shift

A pointer to a gint to be filled in, or None

precision

A pointer to a gint to be filled in, or None

Returns the byte order of this visual.

The information returned by this function is only relevant when working with XImages, and not all backends return meaningful information for this.

Deprecated since 3.22

This information is not useful

Returns

A ByteOrder stating the byte order of self.

Returns the size of a colormap for this visual.

You have to use platform-specific APIs to manipulate colormaps.

Deprecated since 3.22

This information is not useful, since GDK does not provide APIs to operate on colormaps.

Returns

The size of a colormap that is suitable for self.

Returns the bit depth of this visual.

Returns

The bit depth of this visual.

Obtains values that are needed to calculate green pixel values in TrueColor and DirectColor. The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the “mask”). Finally, “precision” refers to how much precision the pixel value contains for a particular primary.

Returns

mask

A pointer to a guint32 to be filled in, or None

shift

A pointer to a gint to be filled in, or None

precision

A pointer to a gint to be filled in, or None

Obtains values that are needed to calculate red pixel values in TrueColor and DirectColor. The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the “mask”). Finally, “precision” refers to how much precision the pixel value contains for a particular primary.

Returns

mask

A pointer to a guint32 to be filled in, or None

shift

A pointer to a gint to be filled in, or None

precision

A pointer to a gint to be filled in, or None

Gets the screen to which this visual belongs

Returns

the screen to which this visual belongs.

Returns the type of visual this is (PseudoColor, TrueColor, etc).

Returns

A VisualType stating the type of self.

Get the visual with the most available colors for the default GDK screen. The return value should not be freed.

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

Returns

best visual

Get the best available depth for the default GDK screen. “Best” means “largest,” i.e. 32 preferred over 24 preferred over 8 bits per pixel.

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

Returns

best available depth

Return the best available visual type for the default GDK screen.

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

Returns

best visual type

Combines best_with_depth() and best_with_type().

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

depth

a bit depth

visual_type

a visual type

Returns

best visual with both depth and visual_type, or None if none

Get the best visual with depth depth for the default GDK screen. Color visuals and visuals with mutable colormaps are preferred over grayscale or fixed-colormap visuals. The return value should not be freed. None may be returned if no visual supports depth.

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

depth

a bit depth

Returns

best visual for the given depth

Get the best visual of the given visual_type for the default GDK screen. Visuals with higher color depths are considered better. The return value should not be freed. None may be returned if no visual has type visual_type.

Deprecated since 3.22

Visual selection should be done using Screen::system_visual() and Screen::rgba_visual()

visual_type

a visual type

Returns

best visual of the given type

Get the system’s default visual for the default GDK screen. This is the visual for the root window of the display. The return value should not be freed.

Deprecated since 3.22

Use gdk_screen_get_system_visual (gdk_screen_get_default ()).

Returns

system visual

Trait Implementations

Returns a copy of the value. Read more

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Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

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

Returns the type identifier of Self.

Auto Trait Implementations

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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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Performs the conversion.

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Same as connect but takes a SignalId instead of a signal name.

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Emit signal by signal id.

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Emit signal by it’s name.

Same as emit but takes Value for the arguments.

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