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//! All of our macros go in here. /// Builds a `u32` value from the given RGBA values. /// /// Each channel is cast into `u32`, and then they're combined into a single /// `u32` value. If inputs aren't within the range `0..=255` you'll get some /// unintentional output. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// const TRANSPARENT_BLACK: u32 = rgba32!(0, 0, 0, 0); /// const SOLID_WHITE: u32 = rgba32!(255u8, 255u16, 255u32, 255.0); /// assert_eq!(TRANSPARENT_BLACK, 0); /// assert_eq!(SOLID_WHITE, ::std::u32::MAX); /// // all other outputs depend on what endian the machine is, /// // currently only little endian is supported. /// assert_eq!(rgba32!(255, 0, 0, 0), 0x000000FF); /// assert_eq!(rgba32!(0, 255, 0, 0), 0x0000FF00); /// assert_eq!(rgba32!(0, 0, 255, 0), 0x00FF0000); /// assert_eq!(rgba32!(0, 0, 0, 255), 0xFF000000); /// } /// ``` #[cfg(target_endian = "little")] #[macro_export] macro_rules! rgba32 { ($r:expr, $g:expr, $b:expr, $a:expr) => { (($a as u32) << 24) | (($b as u32) << 16) | (($g as u32) << 8) | ($r as u32) }; } /// As per [`rgba32`](macro.rgba32.html), but automatically selects alpha = 255. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// assert_eq!(rgb32!(255, 0, 0), rgba32!(255, 0, 0, 255)); /// assert_eq!(rgb32!(0, 255, 0), rgba32!(0, 255, 0, 255)); /// assert_eq!(rgb32!(0, 0, 255), rgba32!(0, 0, 255, 255)); /// } /// ``` #[cfg(target_endian = "little")] #[macro_export] macro_rules! rgb32 { ($r:expr, $g:expr, $b:expr) => { rgba32!($r, $g, $b, 255) }; } /// Builds a `u16` value from the given RGBA values. /// /// Each _color_ channel is cast into `u16`, and then they're combined into a /// single `u16` value (`A1_B5_G5_R5`). If color channel aren't within the range /// `0..=31` you'll get some unintentional output. The alpha value is given as a /// boolean expression, and flips the highest bit on or off. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// const TRANSPARENT_BLACK: u16 = rgba16!(0, 0, 0, false); /// const SOLID_WHITE: u16 = rgba16!(31, 0x1F, 31.0, true); /// assert_eq!(TRANSPARENT_BLACK, 0u16); /// assert_eq!(SOLID_WHITE, ::std::u16::MAX); /// // all other outputs depend on what endian the machine is, /// // currently only little endian is supported. /// assert_eq!(rgba16!(31, 0, 0, false), 0b0000000000011111u16); /// assert_eq!(rgba16!(0, 31, 0, false), 0b0000001111100000u16); /// assert_eq!(rgba16!(0, 0, 31, false), 0b0111110000000000u16); /// assert_eq!(rgba16!(0, 0, 0, true), 0b1000000000000000u16); /// } /// ``` #[cfg(target_endian = "little")] #[macro_export] macro_rules! rgba16 { ($r:expr, $g:expr, $b:expr, $a:expr) => { (($a as u16) << 15) | (($b as u16) << 10) | (($g as u16) << 5) | ($r as u16) }; } /// As per [`rgba16`](macro.rgba16.html), but automatically selects alpha=true. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// assert_eq!(rgb16!(31, 0, 0), rgba16!(31, 0, 0, true)); /// assert_eq!(rgb16!(0, 31, 0), rgba16!(0, 31, 0, true)); /// assert_eq!(rgb16!(0, 0, 31), rgba16!(0, 0, 31, true)); /// } /// ``` #[cfg(target_endian = "little")] #[macro_export] macro_rules! rgb16 { ($r:expr, $g:expr, $b:expr) => { rgba16!($r, $g, $b, true) }; } /// Checks that an address is aligned to a 4 byte bound. /// /// If the result is non-zero, that's how many bytes _past_ the most recent 4 /// byte bound you are. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// for x in 0 .. 100 { /// assert_eq!(check_misalign4!(x), x % 4); /// } /// } /// ``` #[macro_export] macro_rules! check_misalign4 { ($ptr:expr) => { ($ptr as usize) & 3 }; } /// Checks that an address is aligned to a 8 byte bound. /// /// If the result is non-zero, that's how many bytes _past_ the most recent 8 /// byte bound you are. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// for x in 0 .. 100 { /// assert_eq!(check_misalign8!(x), x % 8); /// } /// } /// ``` #[macro_export] macro_rules! check_misalign8 { ($ptr:expr) => { ($ptr as usize) & 7 }; } /// Checks that an address is aligned to a 16 byte bound. /// /// If the result is non-zero, that's how many bytes _past_ the most recent 16 /// byte bound you are. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// for x in 0 .. 100 { /// assert_eq!(check_misalign16!(x), x % 16); /// } /// } /// ``` #[macro_export] macro_rules! check_misalign16 { ($ptr:expr) => { ($ptr as usize) & 15 }; } /// Checks that an address is aligned to a 32 byte bound. /// /// If the result is non-zero, that's how many bytes _past_ the most recent 32 /// byte bound you are. /// /// ```rust /// #[macro_use] /// extern crate retro_pixel; /// /// fn main() { /// for x in 0 .. 100 { /// assert_eq!(check_misalign32!(x), x % 32); /// } /// } /// ``` #[macro_export] macro_rules! check_misalign32 { ($ptr:expr) => { ($ptr as usize) & 31 }; } // TODO: doc-tests, docs #[macro_export] macro_rules! determine_overlay { ($dest:ident, $src:ident, $offset:ident) => {{ let offset_x = $offset.0; let offset_y = $offset.1; let dest_width = $dest.width() as isize; let dest_height = $dest.height() as isize; let src_width = $src.width() as isize; let src_height = $src.height() as isize; // establish that we should be drawing something at all if offset_x < dest_width && offset_y < dest_height && -offset_x < src_width && -offset_y < src_height { // determine where we'll be copying let dest_start_x = (offset_x).max(0) as usize; let dest_start_y = (offset_y).max(0) as usize; let src_start_x = (-offset_x).max(0) as usize; let src_start_y = (-offset_y).max(0) as usize; debug_assert!(dest_width as usize > dest_start_x); debug_assert!(dest_width as usize > dest_start_y); debug_assert!(src_width as usize > src_start_x); debug_assert!(src_height as usize > src_start_y); let clip_width = (dest_width as usize - dest_start_x).min(src_width as usize - src_start_x); let clip_height = (dest_height as usize - dest_start_y).min(src_height as usize - src_start_y); debug_assert!(clip_width > 0); debug_assert!(clip_height > 0); let clip_width = clip_width as usize; let clip_height = clip_height as usize; let src_row_start_ptr = $src.as_ptr().offset(src_start_x as isize + src_start_y as isize * $src.pitch()); let dest_row_start_ptr = $dest.as_mut_ptr().offset(dest_start_x as isize + dest_start_y as isize * $dest.pitch()); (clip_width, clip_height, src_row_start_ptr, dest_row_start_ptr) } else { (0, 0, ::core::ptr::null(), ::core::ptr::null_mut()) } }}; }