Struct PipeState 

pub struct PipeState<'bmp> {
    pub blend_mode: BlendMode,
    pub a_input: u8,
    pub overprint_mask: u32,
    pub overprint_additive: bool,
    pub transfer: TransferSet<'bmp>,
    pub soft_mask: Option<&'bmp [u8]>,
    pub alpha0: Option<&'bmp [u8]>,
    pub knockout: bool,
    pub knockout_opacity: u8,
    pub non_isolated_group: bool,
}

Immutable parameters for one paint operation, built once per fill/stroke/glyph call.

'bmp borrows slices out of the destination bitmap’s alpha plane and the current graphics state’s transfer tables.

Fields

blend_mode: BlendMode

Compositing blend mode.

a_input: u8

Source opacity, pre-scaled: state.fill_alpha * 255.0 rounded to u8. For stroke operations the caller passes stroke_alpha * 255.0.

overprint_mask: u32

Overprint mask: bit k set means channel k is painted. 0xFFFF_FFFF means all channels are painted (the default).

overprint_additive: bool

If true, overprinted channels are additively blended (ink accumulation) rather than replaced. Corresponds to state.overprint_additive.

transfer: TransferSet<'bmp>

Transfer function tables for the current pixel mode, borrowed from GraphicsState. Applied to the composited result before writing.

soft_mask: Option<&'bmp [u8]>

Soft mask alpha plane for the current transparency group, if any. One byte per bitmap pixel; shares the bitmap’s row stride. When Some, a_input is multiplied by the soft mask value per pixel.

alpha0: Option<&'bmp [u8]>

Group alpha0 plane (non-isolated transparency group). One byte per bitmap pixel; None for isolated groups and normal painting.

knockout: bool

true if this is a knockout group: later objects replace earlier objects within the group rather than compositing on top of them.

knockout_opacity: u8

For knockout compositing: the accumulated group opacity threshold.

non_isolated_group: bool

true if we are inside a non-isolated group.

Implementations

impl PipeState<'_>

pub const fn no_transparency(&self, uses_shape: bool) -> bool

Returns true when the simple (no-transparency) fast path is applicable.

Matches C++ pipe->noTransparency: a_input == 255 && no soft_mask && no shape && !in_non_isolated_group && !in_knockout_group

Overprint must be excluded: the simple path overwrites dst_pixels before reading the original destination, making channel-selective restore impossible.

pub fn use_aa_path(&self) -> bool

Returns true when the AA (shape-only) fast path is applicable.

Matches C++ pipeRunAA* selection condition: no pattern, not noTransparency, no soft_mask, usesShape, no alpha0, BlendMode::Normal, not non_isolated_group.

Trait Implementations

impl<'bmp> Clone for PipeState<'bmp>

fn clone(&self) -> PipeState<'bmp>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'bmp> Debug for PipeState<'bmp>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'bmp> Copy for PipeState<'bmp>