spf 0.8.0-alpha.0

.spf (Simple Pixel Font) file parser
Documentation 
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/*
 * Copyright 2025 SimplePixelFont
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pub(crate) use super::*;
use crate::vec;

#[cfg(feature = "log")]
pub(crate) use log::*;

impl<'a, T: TagWriter> SerializeEngine<'a, T> {
    #[cfg(feature = "tagging")]
    pub fn from_layout_and_tags(layout: &'a Layout, tags: T) -> Self {
        Self {
            bytes: byte::ByteWriter::new(),
            layout,
            #[cfg(feature = "tagging")]
            tags,
            #[cfg(feature = "tagging")]
            tagging_data: TaggingData::default(),
            _phantom: PhantomData,
        }
    }
    #[cfg(feature = "tagging")]
    pub fn tagging_engine(&mut self, tags: T) {
        self.tags = tags;
    }
    pub fn data(&self) -> &[u8] {
        &self.bytes.bytes
    }
    pub fn data_owned(self) -> Vec<u8> {
        self.bytes.bytes
    }
}

impl<'a> SerializeEngine<'a> {
    pub fn from_layout(layout: &'a Layout) -> Self {
        Self {
            bytes: byte::ByteWriter::new(),
            layout,
            #[cfg(feature = "tagging")]
            tags: TagWriterNoOp,
            #[cfg(feature = "tagging")]
            tagging_data: TaggingData::default(),
            _phantom: PhantomData,
        }
    }
}

pub(crate) fn push_signature<T: TagWriter>(engine: &mut SerializeEngine<T>) {
    #[cfg(feature = "tagging")]
    let start = engine.bytes.byte_index();

    engine.bytes.push(127);
    engine.bytes.push(102);
    engine.bytes.push(115);
    engine.bytes.push(70);

    #[cfg(feature = "tagging")]
    engine.tags.tag_span(
        TagKind::Signature,
        Span::new(start, engine.bytes.byte_index()),
    );

    #[cfg(feature = "log")]
    info!("Signed font data");
}

pub(crate) fn push_version<T: TagWriter>(engine: &mut SerializeEngine<T>) {
    let version = engine.layout.version as u8;

    engine.bytes.push(version);
    #[cfg(feature = "tagging")]
    engine.tags.tag_byte(
        TagKind::Version {
            value: engine.layout.version,
        },
        engine.bytes.byte_index(),
    );

    #[cfg(feature = "log")]
    info!("Pushed version {}", engine.layout.version);
}

pub(crate) fn push_header<T: TagWriter>(engine: &mut SerializeEngine<T>) {
    let mut font_properties = 0b00000000;
    if engine.layout.compact {
        font_properties |= 0b00000001;
    }

    engine.bytes.push(font_properties);
    #[cfg(feature = "tagging")]
    engine.tags.tag_bitflag(
        TagKind::Header,
        vec![TagKind::CompactFlag {
            enabled: engine.layout.compact,
        }],
        engine.bytes.byte_index(),
    );

    #[cfg(feature = "log")]
    info!("Pushed header");
}