pub struct DmabufTextureBuilder { /* private fields */ }
v4_14
only.Expand description
DmabufTextureBuilder
is a builder used to construct Texture
objects from DMA buffers.
DMA buffers are commonly called dma-bufs.
DMA buffers are a feature of the Linux kernel to enable efficient buffer and memory sharing between hardware such as codecs, GPUs, displays, cameras and the kernel drivers controlling them. For example, a decoder may want its output to be directly shared with the display server for rendering without a copy.
Any device driver which participates in DMA buffer sharing, can do so as either the exporter or importer of buffers (or both).
The memory that is shared via DMA buffers is usually stored in non-system memory (maybe in device’s local memory or something else not directly accessible by the CPU), and accessing this memory from the CPU may have higher-than-usual overhead.
In particular for graphics data, it is not uncommon that data consists of multiple separate blocks of memory, for example one block for each of the red, green and blue channels. These blocks are called planes. DMA buffers can have up to four planes. Even if the memory is a single block, the data can be organized in multiple planes, by specifying offsets from the beginning of the data.
DMA buffers are exposed to user-space as file descriptors allowing to pass them between processes. If a DMA buffer has multiple planes, there is one file descriptor per plane.
The format of the data (for graphics data, essentially its colorspace) is described
by a 32-bit integer. These format identifiers are defined in the header file drm_fourcc.h
and commonly referred to as fourcc values, since they are identified by 4 ASCII
characters. Additionally, each DMA buffer has a modifier, which is a 64-bit integer
that describes driver-specific details of the memory layout, such as tiling or compression.
For historical reasons, some producers of dma-bufs don’t provide an explicit modifier, but
instead return DMA_FORMAT_MOD_INVALID
to indicate that their modifier is implicit.
GTK tries to accommodate this situation by accepting DMA_FORMAT_MOD_INVALID
as modifier.
The operation of DmabufTextureBuilder
is quite simple: Create a texture builder,
set all the necessary properties, and then call build()
to create the new texture.
The required properties for a dma-buf texture are
-
The width and height in pixels
-
The
fourcc
code andmodifier
which identify the format and memory layout of the dma-buf -
The file descriptor, offset and stride for each of the planes
DmabufTextureBuilder
can be used for quick one-shot construction of
textures as well as kept around and reused to construct multiple textures.
For further information, see
-
The Linux kernel documentation
-
The header file drm_fourcc.h
§Properties
§display
The display that this texture will be used on.
Readable | Writeable
§fourcc
The format of the texture, as a fourcc value.
Readable | Writeable
§height
The height of the texture.
Readable | Writeable
§modifier
The modifier.
Readable | Writeable
§n-planes
The number of planes of the texture.
Note that you can set properties for other planes, but they will be ignored when constructing the texture.
Readable | Writeable
§premultiplied
Whether the alpha channel is premultiplied into the others.
Only relevant if the format has alpha.
Readable | Writeable
§update-region
The update region for update-texture
.
Readable | Writeable
§update-texture
The texture update-region
is an update for.
Readable | Writeable
§width
The width of the texture.
Readable | Writeable
GLib type: GObject with reference counted clone semantics.
Implementations§
source§impl DmabufTextureBuilder
impl DmabufTextureBuilder
sourcepub fn new() -> DmabufTextureBuilder
pub fn new() -> DmabufTextureBuilder
sourcepub fn fourcc(&self) -> u32
pub fn fourcc(&self) -> u32
Gets the format previously set via gdk_dmabuf_texture_builder_set_fourcc() or 0 if the format wasn’t set.
The format is specified as a fourcc code.
§Returns
The format
sourcepub fn height(&self) -> u32
pub fn height(&self) -> u32
Gets the height previously set via gdk_dmabuf_texture_builder_set_height() or 0 if the height wasn’t set.
§Returns
The height
sourcepub fn is_premultiplied(&self) -> bool
pub fn is_premultiplied(&self) -> bool
sourcepub fn update_region(&self) -> Option<Region>
pub fn update_region(&self) -> Option<Region>
sourcepub fn update_texture(&self) -> Option<Texture>
pub fn update_texture(&self) -> Option<Texture>
sourcepub fn width(&self) -> u32
pub fn width(&self) -> u32
Gets the width previously set via gdk_dmabuf_texture_builder_set_width() or 0 if the width wasn’t set.
§Returns
The width
sourcepub fn set_display(&self, display: &impl IsA<Display>)
pub fn set_display(&self, display: &impl IsA<Display>)
Sets the display that this texture builder is associated with.
The display is used to determine the supported dma-buf formats.
§display
the display
sourcepub fn set_fourcc(&self, fourcc: u32)
pub fn set_fourcc(&self, fourcc: u32)
Sets the format of the texture.
The format is specified as a fourcc code.
The format must be set before calling GLTextureBuilder::build()
.
§fourcc
the texture’s format or 0 to unset
sourcepub fn set_height(&self, height: u32)
pub fn set_height(&self, height: u32)
Sets the height of the texture.
The height must be set before calling GLTextureBuilder::build()
.
§height
the texture’s height or 0 to unset
sourcepub fn set_modifier(&self, modifier: u64)
pub fn set_modifier(&self, modifier: u64)
sourcepub fn set_n_planes(&self, n_planes: u32)
pub fn set_n_planes(&self, n_planes: u32)
sourcepub fn set_offset(&self, plane: u32, offset: u32)
pub fn set_offset(&self, plane: u32, offset: u32)
sourcepub fn set_premultiplied(&self, premultiplied: bool)
pub fn set_premultiplied(&self, premultiplied: bool)
Sets whether the data is premultiplied.
Unless otherwise specified, all formats including alpha channels are assumed to be premultiplied.
§premultiplied
whether the data is premultiplied
sourcepub fn set_stride(&self, plane: u32, stride: u32)
pub fn set_stride(&self, plane: u32, stride: u32)
Sets the stride for a plane.
The stride must be set for all planes before calling GLTextureBuilder::build()
.
§plane
the plane to set the stride for
§stride
the stride value
sourcepub fn set_update_region(&self, region: Option<&Region>)
pub fn set_update_region(&self, region: Option<&Region>)
Sets the region to be updated by this texture. Together with
update-texture
this describes an
update of a previous texture.
When rendering animations of large textures, it is possible that consecutive textures are only updating contents in parts of the texture. It is then possible to describe this update via these two properties, so that GTK can avoid rerendering parts that did not change.
An example would be a screen recording where only the mouse pointer moves.
§region
the region to update
sourcepub fn set_update_texture(&self, texture: Option<&impl IsA<Texture>>)
pub fn set_update_texture(&self, texture: Option<&impl IsA<Texture>>)
Sets the texture to be updated by this texture. See
set_update_region()
for an explanation.
§texture
the texture to update
sourcepub fn set_width(&self, width: u32)
pub fn set_width(&self, width: u32)
Sets the width of the texture.
The width must be set before calling GLTextureBuilder::build()
.
§width
The texture’s width or 0 to unset
pub fn connect_display_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_fourcc_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_height_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_modifier_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_n_planes_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_premultiplied_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_update_region_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_update_texture_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
pub fn connect_width_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
source§impl DmabufTextureBuilder
impl DmabufTextureBuilder
sourcepub unsafe fn build(self) -> Result<Texture, Error>
pub unsafe fn build(self) -> Result<Texture, Error>
Builds a new Texture
with the values set up in the builder.
It is a programming error to call this function if any mandatory property has not been set.
Not all formats defined in the drm_fourcc.h
header are supported. You can use
DisplayExt::dmabuf_formats()
to get a list of supported formats. If the
format is not supported by GTK, None
will be returned and @error will be set.
The destroy
function gets called when the returned texture gets released.
It is the responsibility of the caller to keep the file descriptors for the planes open until the created texture is no longer used, and close them afterwards (possibly using the @destroy notify).
It is possible to call this function multiple times to create multiple textures, possibly with changing properties in between.
§Returns
a newly built Texture
or NULL
if the format is not supported
pub unsafe fn build_with_release_func<F: FnOnce() + Send + 'static>( self, release_func: F, ) -> Result<Texture, Error>
Trait Implementations§
source§impl Clone for DmabufTextureBuilder
impl Clone for DmabufTextureBuilder
source§impl Debug for DmabufTextureBuilder
impl Debug for DmabufTextureBuilder
source§impl Default for DmabufTextureBuilder
impl Default for DmabufTextureBuilder
source§impl HasParamSpec for DmabufTextureBuilder
impl HasParamSpec for DmabufTextureBuilder
type ParamSpec = ParamSpecObject
source§type SetValue = DmabufTextureBuilder
type SetValue = DmabufTextureBuilder
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, DmabufTextureBuilder>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for DmabufTextureBuilder
impl Hash for DmabufTextureBuilder
source§impl Ord for DmabufTextureBuilder
impl Ord for DmabufTextureBuilder
source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl ParentClassIs for DmabufTextureBuilder
impl ParentClassIs for DmabufTextureBuilder
source§impl<OT: ObjectType> PartialEq<OT> for DmabufTextureBuilder
impl<OT: ObjectType> PartialEq<OT> for DmabufTextureBuilder
source§impl<OT: ObjectType> PartialOrd<OT> for DmabufTextureBuilder
impl<OT: ObjectType> PartialOrd<OT> for DmabufTextureBuilder
source§impl StaticType for DmabufTextureBuilder
impl StaticType for DmabufTextureBuilder
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for DmabufTextureBuilder
Auto Trait Implementations§
impl Freeze for DmabufTextureBuilder
impl RefUnwindSafe for DmabufTextureBuilder
impl !Send for DmabufTextureBuilder
impl !Sync for DmabufTextureBuilder
impl Unpin for DmabufTextureBuilder
impl UnwindSafe for DmabufTextureBuilder
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&self,
signal_name: &str,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect<F>( &self, signal_name: &str, after: bool, callback: F, ) -> SignalHandlerId
signal_name
on this object. Read moresource§fn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F, ) -> SignalHandlerId
signal_id
on this object. Read moresource§fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F, ) -> SignalHandlerId
signal_name
on this object. Read moresource§fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F, ) -> SignalHandlerId
signal_id
on this object. Read moresource§unsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F,
) -> SignalHandlerId
unsafe fn connect_unsafe<F>( &self, signal_name: &str, after: bool, callback: F, ) -> SignalHandlerId
signal_name
on this object. Read moresource§unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F,
) -> SignalHandlerId
unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F, ) -> SignalHandlerId
signal_id
on this object. Read moresource§fn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure,
) -> SignalHandlerId
fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure, ) -> SignalHandlerId
signal_name
on this object. Read moresource§fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure,
) -> SignalHandlerId
fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure, ) -> SignalHandlerId
signal_id
on this object. Read moresource§fn watch_closure(&self, closure: &impl AsRef<Closure>)
fn watch_closure(&self, closure: &impl AsRef<Closure>)
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.source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
source§fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.source§fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
source§fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value],
) -> Option<Value>
fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value], ) -> Option<Value>
source§fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
source§fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value], ) -> Option<Value>
source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value], ) -> Option<Value>
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F,
) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
notify
signal of the object. Read more