add RgbaBitmap::load_file

ggdt/src/graphics/bitmap/rgb/mod.rs

@@ -1,4 +1,7 @@
+use std::path::Path;
+
 use crate::graphics::bitmap::{Bitmap, BitmapError};
+use crate::graphics::palette::Palette;
 
 pub mod blit;
 
@@ -16,4 +19,32 @@ impl RgbaBitmap {
 	pub fn new(width: u32, height: u32) -> Result<Self, BitmapError> {
 		Self::internal_new(width, height)
 	}
+
+	pub fn load_file(path: &Path) -> Result<(Self, Option<Palette>), BitmapError> {
+		if let Some(extension) = path.extension() {
+			let extension = extension.to_ascii_lowercase();
+			match extension.to_str() {
+				Some("png") => Ok(Self::load_png_file(path)?),
+				Some("pcx") => {
+					let (bmp, palette) = Self::load_pcx_file(path)?;
+					Ok((bmp, Some(palette)))
+				},
+				Some("gif") => {
+					let (bmp, palette) = Self::load_gif_file(path)?;
+					Ok((bmp, Some(palette)))
+				},
+				Some("iff") | Some("lbm") | Some("pbm") | Some("bbm") => {
+					let (bmp, palette) = Self::load_iff_file(path)?;
+					Ok((bmp, Some(palette)))
+				}
+				_ => Err(BitmapError::UnknownFileType(String::from(
+					"Unrecognized file extension",
+				))),
+			}
+		} else {
+			Err(BitmapError::UnknownFileType(String::from(
+				"No file extension",
+			)))
+		}
+	}
 }