[−][src]Struct webrender_api::ImageDescriptor
Metadata (but not storage) describing an image In WebRender.
Fields
format: ImageFormat
Format of the image data.
size: DeviceIntSize
Width and length of the image data, in pixels.
stride: Option<i32>
The number of bytes from the start of one row to the next. If non-None,
compute_stride
will return this value, otherwise it returns
width * bpp
. Different source of images have different alignment
constraints for rows, so the stride isn't always equal to width * bpp.
offset: i32
Offset in bytes of the first pixel of this image in its backing buffer. This is used for tiling, wherein WebRender extracts chunks of input images in order to cache, manipulate, and render them individually. This offset tells the texture upload machinery where to find the bytes to upload for this tile. Non-tiled images generally set this to zero.
is_opaque: bool
Whether this image is opaque, or has an alpha channel. Avoiding blending for opaque surfaces is an important optimization.
allow_mipmaps: bool
Whether to allow the driver to automatically generate mipmaps. If images are already downscaled appropriately, mipmap generation can be wasted work, and cause performance problems on some cards/drivers.
See https://github.com/servo/webrender/pull/2555/
Methods
impl ImageDescriptor
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pub fn new(
width: i32,
height: i32,
format: ImageFormat,
is_opaque: bool,
allow_mipmaps: bool
) -> Self
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width: i32,
height: i32,
format: ImageFormat,
is_opaque: bool,
allow_mipmaps: bool
) -> Self
Mints a new ImageDescriptor.
pub fn compute_stride(&self) -> i32
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Returns the stride, either via an explicit stride stashed on the object or by the default computation.
pub fn compute_total_size(&self) -> i32
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Computes the total size of the image, in bytes.
pub fn full_rect(&self) -> DeviceIntRect
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Computes the bounding rectangle for the image, rooted at (0, 0).
Trait Implementations
impl Clone for ImageDescriptor
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fn clone(&self) -> ImageDescriptor
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Copy for ImageDescriptor
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impl PartialEq<ImageDescriptor> for ImageDescriptor
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fn eq(&self, other: &ImageDescriptor) -> bool
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fn ne(&self, other: &ImageDescriptor) -> bool
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impl Debug for ImageDescriptor
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impl<'de> Deserialize<'de> for ImageDescriptor
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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
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__D: Deserializer<'de>,
fn deserialize_in_place<__D>(
__deserializer: __D,
__place: &mut Self
) -> Result<(), __D::Error> where
__D: Deserializer<'de>,
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__deserializer: __D,
__place: &mut Self
) -> Result<(), __D::Error> where
__D: Deserializer<'de>,
impl Serialize for ImageDescriptor
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Auto Trait Implementations
impl Send for ImageDescriptor
impl Sync for ImageDescriptor
Blanket Implementations
impl<T> From for T
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impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = !
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> DeserializeOwned for T where
T: Deserialize<'de>,
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T: Deserialize<'de>,