Struct nannou::ui::prelude::text::rt::gpu_cache::Cache [−][src]
pub struct Cache<'font> { /* fields omitted */ }
Expand description
An implementation of a dynamic GPU glyph cache. See the module documentation for more information.
Implementations
Returns a default CacheBuilder
.
Returns the current scale tolerance for the cache.
Returns the current subpixel position tolerance for the cache.
Returns the cache texture dimensions assumed by the cache. For proper operation this should match the dimensions of the used GPU texture.
Queue a glyph for caching by the next call to cache_queued
. font_id
is used to disambiguate glyphs from different fonts. The user should
ensure that font_id
is unique to the font the glyph is from.
Clears the glyph queue.
Returns a CacheBuilder
with this cache’s attributes.
Caches the queued glyphs. If this is unsuccessful, the queue is untouched. Any glyphs cached by previous calls to this function may be removed from the cache to make room for the newly queued glyphs. Thus if you want to ensure that a glyph is in the cache, the most recently cached queue must have contained that glyph.
uploader
is the user-provided function that should perform the texture
uploads to the GPU. The information provided is the rectangular region
to insert the pixel data into, and the pixel data itself. This data is
provided in horizontal scanline format (row major), with stride equal to
the rectangle width.
If successful returns a CachedBy
that can indicate the validity of
previously cached glyph textures.
Retrieves the (floating point) texture coordinates of the quad for a glyph in the cache, as well as the pixel-space (integer) coordinates that this region should be drawn at. These pixel-space coordinates assume an origin at the top left of the quad. In the majority of cases these pixel-space coordinates should be identical to the bounding box of the input glyph. They only differ if the cache has returned a substitute glyph that is deemed close enough to the requested glyph as specified by the cache tolerance parameters.
A sucessful result is Some
if the glyph is not an empty glyph (no
shape, and thus no rect to return).
Ensure that font_id
matches the font_id
that was passed to
queue_glyph
with this glyph
.
Auto Trait Implementations
impl<'font> RefUnwindSafe for Cache<'font>
impl<'font> UnwindSafe for Cache<'font>
Blanket Implementations
impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for S where
T: Component + Float,
D: AdaptFrom<S, Swp, Dwp, T>,
Swp: WhitePoint,
Dwp: WhitePoint,
impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for S where
T: Component + Float,
D: AdaptFrom<S, Swp, Dwp, T>,
Swp: WhitePoint,
Dwp: WhitePoint,
Mutably borrows from an owned value. Read more
Convert into T with values clamped to the color defined bounds Read more
Convert into T. The resulting color might be invalid in its color space Read more
Convert into T, returning ok if the color is inside of its defined range,
otherwise an OutOfBounds
error is returned which contains the unclamped color. Read more
pub fn vzip(self) -> V