Add additional pixmap methods for allocation management
diff --git a/sparse_strips/vello_api/src/pixmap.rs b/sparse_strips/vello_api/src/pixmap.rs
index c95a569..d856ef4 100644
--- a/sparse_strips/vello_api/src/pixmap.rs
+++ b/sparse_strips/vello_api/src/pixmap.rs
@@ -52,6 +52,34 @@
}
}
+ /// Resizes the pixmap container to the given width and height; this does not resize the
+ /// contained image.
+ ///
+ /// If the pixmap buffer has to grow to fit the new size, those pixels are set to transparent
+ /// black. If the pixmap buffer is larger than required, the buffer is truncated and its
+ /// reserved capacity is unchanged.
+ pub fn resize(&mut self, width: u16, height: u16) {
+ self.width = width;
+ self.height = height;
+ self.buf.resize(
+ usize::from(width) * usize::from(height),
+ PremulRgba8::from_u32(0),
+ );
+ }
+
+ /// Shrink the capacity of the pixmap buffer to fit the pixmap's current size.
+ pub fn shrink_to_fit(&mut self) {
+ self.buf.shrink_to_fit();
+ }
+
+ /// The reserved capacity (in pixels) of this pixmap.
+ ///
+ /// When calling [`Pixmap::resize`] with a `width * height` smaller than this value, the pixmap
+ /// does not need to reallocate.
+ pub fn capacity(&self) -> usize {
+ self.buf.capacity()
+ }
+
/// Return the width of the pixmap.
pub fn width(&self) -> u16 {
self.width
