1 files changed, 71 insertions, 0 deletions
diff --git a/src/app/draw_video.rs b/src/app/draw_video.rs
new file mode 100644
index 0000000..a0d2016
--- /dev/null
+++ b/src/app/draw_video.rs
@@ -0,0 +1,71 @@
+/*
+	Copyright 2021-2023 Gabriel Jensen.
+
+	This file is part of Luma.
+
+	Luma is free software: you can redistribute it
+	and/or modify it under the terms of the GNU
+	Affero General Public License as published by
+	the Free Software Foundation, either version 3
+	of the License, or (at your option) any later
+	version.
+
+	Luma is distributed in the hope that it will be
+	useful, but WITHOUT ANY WARRANTY; without even
+	the implied warranty of MERCHANTABILITY or
+	FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	Affero General Public License for more details.
+
+	You should have received a copy of the GNU
+	Affero General Public License along with Luma.
+	If not, see <https://www.gnu.org/licenses/>.
+*/
+
+use crate::SCREEN_SIZE;
+use crate::app::App;
+
+use sdl2::pixels::Color;
+use sdl2::rect::Rect;
+
+impl App {
+	pub fn draw_video(&mut self, video: &[u8], agb_palette: &[u16]) {
+		// TO-DO: Honour video mode.
+
+		let mut palette: [Color; 0x100] = [Color::RGB(0x00, 0x00, 0x00); 0x100];
+
+		for (index, element) in palette.iter_mut().enumerate() {
+			let value = unsafe { *agb_palette.get_unchecked(index) };
+
+			let colour = decode_colour(value);
+			*element = colour;
+		}
+
+		for pixel_y in 0x0..SCREEN_SIZE.1 {
+			for pixel_x in 0x0..SCREEN_SIZE.0 {
+				let pixel = pixel_y as usize * SCREEN_SIZE.0 as usize + pixel_x as usize;
+
+				let value  = video[pixel];
+				let colour = palette[value as usize];
+				self.canvas.set_draw_color(colour);
+
+				let square = Rect::new(
+					(pixel_x as u32 * self.scale) as i32,
+					(pixel_y as u32 * self.scale) as i32,
+					self.scale,
+					self.scale,
+				);
+				self.canvas.fill_rect(square).unwrap();
+			}
+		}
+
+		self.canvas.present();
+	}
+}
+
+fn decode_colour(colour: u16) -> Color {
+	let red   = ((colour & 0b0000000000011111) as f32 / 31.0    * 255.0) as u8;
+	let green = ((colour & 0b0000001111100000) as f32 / 992.0   * 255.0) as u8;
+	let blue  = ((colour & 0b0111110000000000) as f32 / 31744.0 * 255.0) as u8;
+
+	return Color::RGB(red, green, blue);
+}