72 lines
2.0 KiB
Rust
72 lines
2.0 KiB
Rust
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use crate::misc::emulator_error::EmulatorError;
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use crate::misc::result::EmulatorResult;
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pub struct Color(u8);
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const RED_MULT: u8 = 36;
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const GREEN_MULT: u8 = 6;
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impl Color {
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/// Only first 216 color indices are used.
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const COLOR_MAX:u8 = 215;
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const COLOR_FACTOR_8_BIT: u8 = 0x33;
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/// This constructs a valid color from rgb triplet
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pub fn from_rgb(red: u8, green: u8, blue: u8) -> Color {
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let red = red / Self::COLOR_FACTOR_8_BIT;
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let green = green / Self::COLOR_FACTOR_8_BIT;
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let blue = blue / Self::COLOR_FACTOR_8_BIT;
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Color(red * RED_MULT + green * GREEN_MULT + blue)
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}
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pub fn try_new(in_mem_color: u8) -> EmulatorResult<Color> {
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if in_mem_color > Self::COLOR_MAX {
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return Err(EmulatorError::InvalidColorError(in_mem_color))
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}
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Ok(Color(in_mem_color))
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}
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pub fn get_mem_byte(&self) -> u8 {
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self.0
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}
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/// This fetches the rgb triplet
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pub fn get_rgb(self) -> [u8; 3] {
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let r = self.0 / RED_MULT;
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let gb_byte_remainder = self.0 % RED_MULT;
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let g = gb_byte_remainder / GREEN_MULT;
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let b = gb_byte_remainder % GREEN_MULT;
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[r * Self::COLOR_FACTOR_8_BIT, g * Self::COLOR_FACTOR_8_BIT, b * Self::COLOR_FACTOR_8_BIT]
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::graphics::color::Color;
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#[test]
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pub fn test_from_mem_zero() {
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let color = Color::try_new(0).unwrap();
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assert_eq!([0u8; 3], color.get_rgb())
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}
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#[test]
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pub fn test_from_mem_invalid() {
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let color = Color::try_new(0xff);
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assert!(color.is_err())
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}
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#[test]
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pub fn test_from_mem_max(){
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let color = Color::try_new(Color::COLOR_MAX).unwrap();
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assert_eq!([255u8;3],color.get_rgb())
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}
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#[test]
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pub fn from_rgb_zero(){
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let color = Color::from_rgb(0,0,0);
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assert_eq!(0,color.get_mem_byte())
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}
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#[test]
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pub fn from_rgb_max(){
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let color = Color::from_rgb(255,255,255);
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assert_eq!(Color::COLOR_MAX,color.get_mem_byte())
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}
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}
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