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// Copyright (c) 2023 Xu Shaohua <shaohua@biofan.org>. All rights reserved.
// Use of this source is governed by Lesser General Public License that can be found
// in the LICENSE file.

pub const R32_SHIFT: u32 = 0;
pub const B32_SHIFT: u32 = 16 - R32_SHIFT;
pub const G32_SHIFT: u32 = 8;
pub const A32_SHIFT: u32 = 24;

// TODO(Shaohua): PMCOLOR_BYTE_ORDER can be used to query the byte order of SkPMColor at compile time.

pub type FourByteTag = u32;

#[must_use]
#[inline]
pub fn set_four_byte_tag(a: u8, b: u8, c: u8, d: u8) -> FourByteTag {
    (u32::from(a) << 24) | (u32::from(b) << 16) | (u32::from(c) << 8) | u32::from(d)
}

/// 32 bit integer to hold a unicode value
pub type Unichar = i32;

/// 16 bit unsigned integer to hold a glyph index
pub type GlyphId = u16;

/// 32 bit value to hold a millisecond duration.
///
/// Note that `MILLI_SEC_MAX` is about 25 days.
pub type MilliSec = u32;

/// Maximum representable milliseconds; 24d 20h 31m 23.647s.
pub const MILLI_SEC_MAX: MilliSec = u32::MAX;

/// The generation IDs reserve 0 has an invalid marker.
pub const INVALID_GEN_ID: u32 = 0;

/// The unique IDs reserve 0 has an invalid marker.
pub const INVALID_UNIQUE_ID: u32 = 0;