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Deepmap2Header

deepmap2::raw

Struct Deepmap2Header 

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pub struct Deepmap2Header {
    pub decode_type: DecodeType,
    pub version: u8,
    pub predictor_type: u8,
    pub pixel_format: PixelFormat,
    pub width: u16,
    pub height: u16,
    pub palette_size: Option<u16>,
    pub palette_type: Option<u16>,
    pub palette: Vec<u32>,
}
Expand description

deepmap2 文件头（小端序，deku 解析）

二进制布局（12 字节基础，Palette 类型有额外字段）:

offset  size  field
0       4     magic = b"dmp2"
4       1     decode_type
5       1     version (aux_flag_0: chroma scale 开关)
6       1     predictor_type (aux_flag_1: 实际为每行数据中的预测器，此字段含义待定)
7       1     pixel_format
8       2     width (LE)
10      2     height (LE)
--- Palette 专用 ---
12      2     palette_size
14      2     palette_type (3 or 4)
16      palette_size*4  palette (BGRA u32 LE entries)

Fields§

§decode_type: DecodeType§version: u8

chroma scale 开关（非零=开启 chroma scaling）

§predictor_type: u8

保留/未知辅助标志

§pixel_format: PixelFormat§width: u16§height: u16§palette_size: Option<u16>§palette_type: Option<u16>§palette: Vec<u32>

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impl Deepmap2Header

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pub fn header_size(&self) -> usize

返回该头部消耗的字节数（payload 的起始偏移量）

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pub fn chroma_scale(&self) -> u8

chroma scale 值（用于 YCoCg 转换中的色度缩放）

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pub fn pixel_count(&self) -> usize

Trait Implementations§

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impl Clone for Deepmap2Header

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for Deepmap2Header

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

Formats the value using the given formatter. Read more
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impl DekuContainerRead<'_> for Deepmap2Header

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fn from_reader<'a, R: Read + Seek>( __deku_input: (&'a mut R, usize), ) -> Result<(usize, Self), DekuError>

Construct type from Reader implementing no_std_io::Read. Read more
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fn from_bytes( __deku_input: (&[u8], usize), ) -> Result<((&[u8], usize), Self), DekuError>

Read bytes and construct type Read more
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impl DekuReader<'_> for Deepmap2Header

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fn from_reader_with_ctx<R: Read + Seek>( __deku_reader: &mut Reader<R>, _: (), ) -> Result<Self, DekuError>

Construct type from reader implementing no_std_io::Read, with ctx. Read more
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impl TryFrom<&[u8]> for Deepmap2Header

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type Error = DekuError

The type returned in the event of a conversion error.
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fn try_from(input: &[u8]) -> Result<Self, Self::Error>

Performs the conversion.

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