ndless_sdl/
nsdl.rs

1//! # Module for managing nSDL fonts
2//! Example:
3//! ```
4//! let font = Font::new(FontOptions::Thin, 255, 255, 255);
5//! screen.draw_str(&font, "message", 0, 0);
6//! ```
7
8use crate::video::ll::SDL_Surface;
9
10pub mod ll {
11	use crate::video;
12
13	#[repr(C)]
14	pub struct nSDL_Font {
15		pub chars: [*mut video::ll::SDL_Surface; 256usize],
16		pub char_width: [cty::uint8_t; 256usize],
17		pub hspacing: cty::c_int,
18		pub vspacing: cty::c_int,
19		pub monospaced: bool,
20	}
21
22	extern "C" {
23		pub fn nSDL_LoadFont(font_index: i32, r: u8, g: u8, b: u8) -> *mut nSDL_Font;
24		pub fn nSDL_DrawString(
25			surface: *mut video::ll::SDL_Surface,
26			font: *const nSDL_Font,
27			x: i32,
28			y: i32,
29			str: *const cty::c_char,
30		);
31		pub fn nSDL_FreeFont(font: *mut nSDL_Font);
32		pub fn nSDL_GetStringWidth(font: *mut nSDL_Font, str: *const cty::c_char) -> i32;
33		pub fn nSDL_GetStringHeight(font: *mut nSDL_Font, str: *const cty::c_char) -> i32;
34		pub fn nSDL_EnableFontMonospaced(font: *mut nSDL_Font, monospaced: i32);
35		pub fn nSDL_SetFontSpacing(font: *mut nSDL_Font, hspacing: i32, vspacing: i32);
36	}
37}
38
39#[repr(i32)]
40#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
41pub enum FontOptions {
42	Thin = 0,
43	Space,
44	VGA,
45	Fantasy,
46	ThinType,
47}
48
49#[derive(Clone, Debug)]
50pub struct Font {
51	pub font: *mut ll::nSDL_Font,
52}
53
54impl Font {
55	pub fn new(font: FontOptions, r: u8, g: u8, b: u8) -> Self {
56		let font = unsafe { ll::nSDL_LoadFont(font as i32, r, g, b) };
57		if font.is_null() {
58			panic!("Error loading font")
59		}
60		Self { font }
61	}
62
63	pub fn draw(&self, surface: *mut SDL_Surface, msg: &str, x: i32, y: i32) {
64		let msg = ndless::cstr!(msg);
65		unsafe { ll::nSDL_DrawString(surface, self.font, x, y, msg.as_ptr()) }
66	}
67
68	pub fn get_width(&self, msg: &str) -> i32 {
69		let msg = ndless::cstr!(msg);
70		unsafe { ll::nSDL_GetStringWidth(self.font, msg.as_ptr()) }
71	}
72
73	pub fn get_height(&self, msg: &str) -> i32 {
74		let msg = ndless::cstr!(msg);
75		unsafe { ll::nSDL_GetStringHeight(self.font, msg.as_ptr()) }
76	}
77
78	pub fn monospaced(&self, monospaced: bool) {
79		unsafe { ll::nSDL_EnableFontMonospaced(self.font, if monospaced { 1 } else { 0 }) }
80	}
81
82	pub fn spacing(&self, horizontal: i32, vertical: i32) {
83		unsafe { ll::nSDL_SetFontSpacing(self.font, horizontal, vertical) }
84	}
85}
86
87impl Drop for Font {
88	fn drop(&mut self) {
89		unsafe { ll::nSDL_FreeFont(self.font) }
90	}
91}
ndless_sdl/nsdl.rs

ndless_sdl/
nsdl.rs
