flo_ui 0.1.0

Implementation-free user interface description library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

use super::*;

use png;
use png::HasParameters;

///
/// Creates a PNG image in memory for an RGBA buffer
/// 
pub fn png_data_for_rgba(rgba: &[u8], width: u32, height: u32) -> InMemoryImageData {
    // Create the buffer to write the PNG data to
    let mut png_data: Vec<u8> = vec![];

    {
        // Create an encoder that will write to this buffer
        let mut png_encoder = png::Encoder::new(&mut png_data, width, height);
        png_encoder
            .set(png::ColorType::RGBA)
            .set(png::BitDepth::Eight);
        
        // Write the header
        let mut png_writer = png_encoder.write_header().unwrap();
        
        // Write the image data
        png_writer.write_image_data(rgba).unwrap();
    }

    // Generate the image data object for the final PNG
    InMemoryImageData::new(png_data)
}