Starting process of porting to tiny skia

src/img.rs

@@ -0,0 +1,21 @@
+
+use image::{RgbaImage, ExtendedColorType, ImageEncoder, load_from_memory};
+use image::codecs::png::PngEncoder;
+
+pub fn save_to_memory_png(p: &RgbaImage) -> Result<Vec<u8>, String> {
+	let (width, height) = p.dimensions();
+	let mut blob = Vec::<u8>::new();
+	let png_encoder = PngEncoder::new(&mut blob);
+	match png_encoder.write_image(p, width, height, ExtendedColorType::Rgba8) {
+		Ok(()) => Ok(blob),
+		Err(_) => Err("Failed to encode text png".to_string()),
+	}
+}
+
+pub fn ensure_32_bit_png(p: &[u8]) -> Result<Vec<u8>, String> {
+	let img = match load_from_memory(p) {
+		Ok(i) => i,
+		Err(e) => return Err(format!("Failed to load png: {e}")),
+	};
+	save_to_memory_png(&img.into_rgba8())
+}