mirror of https://git.sr.ht/~kikoodx/kble
48 lines
1.5 KiB
Zig
48 lines
1.5 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2021 KikooDX
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// This file is part of [KBLE](https://sr.ht/~kikoodx/kble), which is
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// MIT licensed. The MIT license requires this copyright notice to be
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// included in all copies and substantial portions of the software.
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//! Operates on a scale value used by drawing code.
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const std = @import("std");
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const expect = std.testing.expect;
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const maxInt = std.math.maxInt;
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const conf = @import("conf.zig");
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const Parameter = @import("parameter.zig");
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pub const scale_type = u8;
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const scale_min = 3;
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const scale_max = maxInt(scale_type);
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pub fn scale_reset(current_scale: scale_type, arg: Parameter.buffer_type) scale_type {
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return conf.default_scaling_level;
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}
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pub fn scale_up(current_scale: scale_type, arg: Parameter.buffer_type) scale_type {
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if (@intCast(u32, current_scale) + @intCast(u32, arg) < @intCast(u32, scale_max)) {
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return current_scale + @intCast(u8, arg);
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} else return scale_max;
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}
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pub fn scale_down(current_scale: scale_type, arg: Parameter.buffer_type) scale_type {
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if (@intCast(i32, current_scale) - @intCast(i32, arg) > @intCast(i32, scale_min)) {
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return current_scale - @intCast(u8, arg);
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} else return scale_min;
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}
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test "scale reset" {
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expect(scale_reset(42, 1) == conf.default_scaling_level);
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}
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test "scale up" {
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expect(scale_up(42, 1) == 43);
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expect(scale_up(scale_max - 4, 42) == scale_max);
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}
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test "scale down" {
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expect(scale_down(42, 1) == 41);
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expect(scale_down(scale_min + 2, 42) == scale_min);
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}
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