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Don't need to recalculate width in bytes

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This commit is contained in:
Ryan Kennedy 2020-03-23 13:33:04 -05:00
parent f43ef646a7
commit ec9f652de0
1 changed files with 2 additions and 1 deletions
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3
src/writers/graphics_640x480x16.rs
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@ -8,6 +8,7 @@ use spinning_top::SpinlockGuard;
const WIDTH: usize = 640; const WIDTH: usize = 640;
const HEIGHT: usize = 480; const HEIGHT: usize = 480;
const ALL_PLANES_SCREEN_SIZE: usize = (WIDTH * HEIGHT) / 8; const ALL_PLANES_SCREEN_SIZE: usize = (WIDTH * HEIGHT) / 8;
const WIDTH_IN_BYTES: usize = WIDTH / 8;
/// A basic interface for interacting with vga graphics mode 640x480x16 /// A basic interface for interacting with vga graphics mode 640x480x16
/// ///
@ -53,7 +54,7 @@ impl Graphics640x480x16 {
/// Sets the given pixel at `(x, y)` to the given `color`. /// Sets the given pixel at `(x, y)` to the given `color`.
pub fn set_pixel(&self, x: usize, y: usize, color: Color16Bit) { pub fn set_pixel(&self, x: usize, y: usize, color: Color16Bit) {
let (mut vga, frame_buffer) = self.get_frame_buffer(); let (mut vga, frame_buffer) = self.get_frame_buffer();
let offset = x / 8 + (WIDTH / 8) * y; let offset = x / 8 + y * WIDTH_IN_BYTES;
// Which pixel to modify this write // Which pixel to modify this write
let pixel_offset = x & 7; let pixel_offset = x & 7;
// Set write mode 2 so screen data is only modified by the bitmask // Set write mode 2 so screen data is only modified by the bitmask