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use math::{relative_source_rectangle, Scalar};
use types::SourceRectangle;

/// Should be implemented by contexts that
/// have source rectangle information.
pub trait SourceRectangled {
    /// Adds a source rectangle.
    fn src_rect(self, x: Scalar, y: Scalar, w: Scalar, h: Scalar) -> Self;

    /// Moves to a relative source rectangle using
    /// the current source rectangle as tile.
    fn src_rel(self, x: Scalar, y: Scalar) -> Self;

    /// Flips the source rectangle horizontally.
    fn src_flip_h(self) -> Self;

    /// Flips the source rectangle vertically.
    fn src_flip_v(self) -> Self;

    /// Flips the source rectangle horizontally and vertically.
    fn src_flip_hv(self) -> Self;
}

impl SourceRectangled for SourceRectangle {
    #[inline(always)]
    fn src_rect(self, x: Scalar, y: Scalar, w: Scalar, h: Scalar) -> Self {
        [x, y, w, h]
    }

    #[inline(always)]
    fn src_rel(self, x: Scalar, y: Scalar) -> Self {
        relative_source_rectangle(self, x, y)
    }

    #[inline(always)]
    fn src_flip_h(self) -> Self {
        [self[0] + self[2], self[1], -self[2], self[3]]
    }

    #[inline(always)]
    fn src_flip_v(self) -> Self {
        [self[0], self[1] + self[3], self[2], -self[3]]
    }

    #[inline(always)]
    fn src_flip_hv(self) -> Self {
        [self[0] + self[2], self[1] + self[3], -self[2], -self[3]]
    }
}