Struct lodepng::ffi::ColorMode

#[repr(C)]
pub struct ColorMode {
    pub colortype: ColorType,
    /* private fields */
}

Color mode of an image. Contains all information required to decode the pixel bits to RGBA colors. This information is the same as used in the PNG file format, and is used both for PNG and raw image data in LodePNG.

Fields

colortype: ColorType

color type, see PNG standard

Implementations

impl ColorMode

pub fn new() -> Self

pub fn colortype(&self) -> ColorType

pub fn set_colortype(&mut self, color: ColorType)

pub fn bitdepth(&self) -> u32

pub fn set_bitdepth(&mut self, d: u32)

pub fn set_palette(&mut self, palette: &[RGBA]) -> Result<(), Error>

Set color depth to 8-bit palette and set the colors

pub fn palette_clear(&mut self)

Reset to 0 colors

pub fn palette_add(&mut self, p: RGBA) -> Result<(), Error>

add 1 color to the palette

pub fn palette(&self) -> &[RGBA]

pub fn palette_mut(&mut self) -> &mut [RGBA]

pub fn bpp(&self) -> u32

get the total amount of bits per pixel, based on colortype and bitdepth in the struct

pub fn set_key(&mut self, r: u16, g: u16, b: u16)

tRNS chunk

pub fn channels(&self) -> u8

get the amount of color channels used, based on colortype in the struct. If a palette is used, it counts as 1 channel.

pub fn is_greyscale_type(&self) -> bool

is it a greyscale type? (only colortype 0 or 4)

pub fn is_alpha_type(&self) -> bool

has it got an alpha channel? (only colortype 2 or 6)

pub fn is_palette_type(&self) -> bool

has it got a palette? (only colortype 3)

pub fn has_palette_alpha(&self) -> bool

only returns true if there is a palette and there is a value in the palette with alpha < 255. Loops through the palette to check this.

pub fn can_have_alpha(&self) -> bool

Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image. Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn’t use such pixels). Returns false if the image can only have opaque pixels. In detail, it returns true only if it’s a color type with alpha, or has a palette with non-opaque values, or if “key_defined” is true.

pub fn raw_size(&self, w: u32, h: u32) -> usize

Returns the byte size of a raw image buffer with given width, height and color mode

Trait Implementations

impl Clone for ColorMode

fn clone(&self) -> ColorMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColorMode

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

Formats the value using the given formatter.

impl Default for ColorMode

fn default() -> Self

Returns the “default value” for a type.