Struct ImageViewer 

pub struct ImageViewer {
    pub state: ImageViewerState,
    pub image: Option<Image>,
    pub filename: String,
    pub zoom_level: usize,
    pub offset_x: isize,
    pub offset_y: isize,
    pub surface_id: Option<u32>,
    pub width: usize,
    pub height: usize,
    pub toolbar_height: usize,
}

Image viewer application state.

Fields

state: ImageViewerState

image: Option<Image>

filename: String

zoom_level: usize

Zoom level as a percentage (100 = 1:1). Range 25..=400.

offset_x: isize

Pan offset (pixels in image-space).

offset_y: isize

surface_id: Option<u32>

Compositor surface ID (set when wired to the desktop).

width: usize

Window dimensions.

height: usize

toolbar_height: usize

Height of the toolbar in pixels.

Implementations

impl ImageViewer

pub fn new() -> Self

Create a new, empty image viewer.

pub fn load_ppm(data: &[u8]) -> Result<Image, &'static str>

Load a PPM image (P3 ASCII or P6 binary).

pub fn load_bmp(data: &[u8]) -> Result<Image, &'static str>

Load a BMP image (24-bit or 32-bit uncompressed).

pub fn load_tga(data: &[u8]) -> Result<Image, &'static str>

Load a TGA image via the video decoder, converting to BGRA u32 pixels.

pub fn load_qoi(data: &[u8]) -> Result<Image, &'static str>

Load a QOI image via the video decoder, converting to BGRA u32 pixels.

pub fn load_file(&mut self, filename: &str, data: &[u8])

Load an image file from raw byte data, auto-detecting the format.

pub fn zoom_in(&mut self)

Increase zoom by one step.

pub fn zoom_out(&mut self)

Decrease zoom by one step.

pub fn zoom_fit(&mut self)

Fit image to viewer area.

pub fn handle_key(&mut self, key: u8) -> ImageViewerAction

Handle a keyboard event and return the resulting action.

pub fn render_to_buffer( &self, buffer: &mut [u32], buf_width: usize, buf_height: usize, )

Render the image viewer into a u32 BGRA pixel buffer.

buffer must be at least buf_width * buf_height elements.

impl ImageViewer

pub fn render_to_u8_buffer( &self, buf: &mut [u8], buf_width: usize, buf_height: usize, )

Render the image viewer into a u8 BGRA pixel buffer.

Delegates to render_to_buffer (u32), then converts to u8 bytes.

Trait Implementations

impl Default for ImageViewer

fn default() -> Self

Returns the “default value” for a type.