Init

1 files changed, 166 insertions, 0 deletions

diff --git a/src/sfml/graphics/color.zig b/src/sfml/graphics/color.zig
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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);
+}