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renderer: fix underflow possibility in padding calculation

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This commit is contained in:
Mitchell Hashimoto
2024-08-10 21:00:04 -07:00
parent 1c982278f3
commit bac258e6d2
1 changed files with 8 additions and 2 deletions
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10
src/renderer/size.zig
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@ -43,8 +43,14 @@ pub const ScreenSize = struct {
const grid_height = grid.rows * cell.height;
const padded_width = grid_width + (padding.left + padding.right);
const padded_height = grid_height + (padding.top + padding.bottom);
const leftover_width = self.width - padded_width;
const leftover_height = self.height - padded_height;
// Note these have to use a saturating subtraction to avoid underflow
// because our padding can cause the padded sizes to be larger than
// our real screen if the screen is shrunk to a minimal size such
// as 1x1.
const leftover_width = self.width -| padded_width;
const leftover_height = self.height -| padded_height;
return .{
.top = 0,
.bottom = leftover_height,