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//! Utility class for manipulating RGBA colors.
const sf = @import("../sfml_import.zig");
const math = @import("std").math;
pub const Color = packed struct {
/// Converts a color from a csfml object
/// For inner workings
pub fn fromCSFML(col: sf.c.sfColor) Color {
return @bitCast(Color, col);
}
/// Converts this color to a csfml one
/// For inner workings
pub fn toCSFML(self: Color) sf.c.sfColor {
return @bitCast(sf.c.sfColor, self);
}
/// Inits a color with rgb components
pub fn fromRGB(red: u8, green: u8, blue: u8) Color {
return Color{
.r = red,
.g = green,
.b = blue,
.a = 0xff,
};
}
/// Inits a color with rgba components
pub fn fromRGBA(red: u8, green: u8, blue: u8, alpha: u8) Color {
return Color{
.r = red,
.g = green,
.b = blue,
.a = alpha,
};
}
/// Inits a color from a 32bits value (RGBA in that order)
pub fn fromInteger(int: u32) Color {
return Color{
.r = @truncate(u8, (int & 0xff000000) >> 24),
.g = @truncate(u8, (int & 0x00ff0000) >> 16),
.b = @truncate(u8, (int & 0x0000ff00) >> 8),
.a = @truncate(u8, (int & 0x000000ff) >> 0),
};
}
/// Gets a 32 bit integer representing the color
pub fn toInteger(self: Color) u32 {
return (@intCast(u32, self.r) << 24) |
(@intCast(u32, self.g) << 16) |
(@intCast(u32, self.b) << 8) |
(@intCast(u32, self.a) << 0);
}
/// Creates a color with rgba floats from 0 to 1
fn fromFloats(red: f32, green: f32, blue: f32, alpha: f32) Color {
return Color{
.r = @floatToInt(u8, math.clamp(red, 0.0, 1.0) * 255.0),
.g = @floatToInt(u8, math.clamp(green, 0.0, 1.0) * 255.0),
.b = @floatToInt(u8, math.clamp(blue, 0.0, 1.0) * 255.0),
.a = @floatToInt(u8, math.clamp(alpha, 0.0, 1.0) * 255.0),
};
}
/// Creates a color from HSV and transparency components (this is not part of the SFML)
/// hue is in degrees, saturation and value are in percents
pub fn fromHSVA(hue: f32, saturation: f32, value: f32, alpha: f32) Color {
const h = hue;
const s = saturation / 100;
const v = value / 100;
const a = alpha;
var hh: f32 = h;
if (v <= 0.0)
return fromFloats(0, 0, 0, a);
if (hh >= 360.0)
hh = 0;
hh /= 60.0;
var ff: f32 = hh - math.floor(hh);
var p: f32 = v * (1.0 - s);
var q: f32 = v * (1.0 - (s * ff));
var t: f32 = v * (1.0 - (s * (1.0 - ff)));
return switch (@floatToInt(usize, hh)) {
0 => fromFloats(v, t, p, a),
1 => fromFloats(q, v, p, a),
2 => fromFloats(p, v, t, a),
3 => fromFloats(p, q, v, a),
4 => fromFloats(t, p, v, a),
else => fromFloats(v, p, q, a),
};
}
// Colors
/// Black color
pub const Black = Color.fromRGB(0, 0, 0);
/// White color
pub const White = Color.fromRGB(255, 255, 255);
/// Red color
pub const Red = Color.fromRGB(255, 0, 0);
/// Green color
pub const Green = Color.fromRGB(0, 255, 0);
/// Blue color
pub const Blue = Color.fromRGB(0, 0, 255);
/// Yellow color
pub const Yellow = Color.fromRGB(255, 255, 0);
/// Magenta color
pub const Magenta = Color.fromRGB(255, 0, 255);
/// Cyan color
pub const Cyan = Color.fromRGB(0, 255, 255);
/// Transparent color
pub const Transparent = Color.fromRGBA(0, 0, 0, 0);
/// Red component
r: u8,
/// Green component
g: u8,
/// Blue component
b: u8,
/// Alpha (opacity) component
a: u8,
};
test "color: conversions" {
const tst = @import("std").testing;
var code: u32 = 0x4BDA9CFF;
var col = Color.fromInteger(code);
try tst.expectEqual(Color.fromRGB(75, 218, 156), col);
try tst.expectEqual(code, col.toInteger());
var csfml_col = sf.c.sfColor_fromInteger(@as(c_uint, code));
try tst.expectEqual(Color.fromCSFML(csfml_col), col);
}
test "color: hsv to rgb" {
const tst = @import("std").testing;
var col = Color.fromHSVA(10, 20, 100, 255);
try tst.expectEqual(Color.fromRGB(255, 212, 204), col);
}
test "color: sane from/to CSFML color" {
const tst = @import("std").testing;
const col = Color.fromRGBA(5, 12, 28, 127);
const ccol = col.toCSFML();
try tst.expectEqual(col.r, ccol.r);
try tst.expectEqual(col.g, ccol.g);
try tst.expectEqual(col.b, ccol.b);
try tst.expectEqual(col.a, ccol.a);
const col2 = Color.fromCSFML(ccol);
try tst.expectEqual(col, col2);
}
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