Pasting large code block below. Sorry.
I'm at a loss as to why the following does not render text in the created window when run with cargo run PATH_TO_MY_FONT. I know the path is valid b/c when I run the sdl2 ttf-demo example with the same path argument it displays text just fine.
extern crate sdl2;
use std::env;
use std::path::Path;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use sdl2::pixels::Color;
use sdl2::rect::Rect;
use sdl2::render::TextureQuery;
static SCREEN_WIDTH: u32 = 900;
static SCREEN_HEIGHT: u32 = 700;
// handle the annoying Rect i32
macro_rules! rect(
($x:expr, $y:expr, $w:expr, $h:expr) => (
Rect::new($x as i32, $y as i32, $w as u32, $h as u32)
)
);
// Scale fonts to a reasonable size when they're too big (though they might look less smooth)
fn get_centered_rect(rect_width: u32, rect_height: u32, cons_width: u32, cons_height: u32) -> Rect {
let wr = rect_width as f32 / cons_width as f32;
let hr = rect_height as f32 / cons_height as f32;
let (w, h) = if wr > 1f32 || hr > 1f32 {
if wr > hr {
println!("Scaling down! The text will look worse!");
let h = (rect_height as f32 / wr) as i32;
(cons_width as i32, h)
} else {
println!("Scaling down! The text will look worse!");
let w = (rect_width as f32 / hr) as i32;
(w, cons_height as i32)
}
} else {
(rect_width as i32, rect_height as i32)
};
let cx = (SCREEN_WIDTH as i32 - w) / 2;
let cy = (SCREEN_HEIGHT as i32 - h) / 2;
rect!(cx, cy, w, h)
}
fn run(font_path: &Path) -> Result<(), String> {
let sdl = sdl2::init()?;
let video_subsystem = sdl.video()?;
let ttf_context = sdl2::ttf::init().map_err(|e| e.to_string())?;
let mut window = video_subsystem
.window("TOY", 900, 700)
.resizable()
.opengl()
.build()
.map_err(|e| e.to_string())?;
window.set_opacity(0.5)?;
let mut canvas = window.into_canvas().build().map_err(|e| e.to_string())?;
let texture_creator = canvas.texture_creator();
let mut font = ttf_context.load_font(font_path, 64)?;
font.set_style(sdl2::ttf::FontStyle::BOLD);
let surface = font
.render("TESTING")
.blended_wrapped(Color::RGBA(255, 0, 0, 255), 500)
.map_err(|e| e.to_string())?;
let texture = texture_creator
.create_texture_from_surface(&surface)
.map_err(|e| e.to_string())?;
canvas.set_draw_color(Color::RGBA(255, 0, 0, 0));
canvas.clear();
let TextureQuery { width, height, .. } = texture.query();
// If the example text is too big for the screen, downscale it (and center irregardless)
let padding = 64;
let target = get_centered_rect(
width,
height,
SCREEN_WIDTH - padding,
SCREEN_HEIGHT - padding,
);
canvas.copy(&texture, None, Some(target))?;
canvas.present();
'main: loop {
for event in sdl.event_pump()?.poll_iter() {
match event {
sdl2::event::Event::Quit { .. } => break 'main,
_ => {}
}
}
}
Ok(())
}
fn main() -> Result<(), String> {
let args: Vec<_> = env::args().collect();
println!("linked sdl2_ttf: {}", sdl2::ttf::get_linked_version());
let path: &Path = Path::new(&args[1]);
run(path)?;
Ok(())
}
Here's the diff between a working and nonworking version. I don't see anything that makes sense to cause this problem.
diff --git a/src/main.rs b/src/main.rs
index 69cc7c3..883f4b2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,9 +8,8 @@ use sdl2::keyboard::Keycode;
use sdl2::pixels::Color;
use sdl2::rect::Rect;
use sdl2::render::TextureQuery;
-
-static SCREEN_WIDTH: u32 = 800;
-static SCREEN_HEIGHT: u32 = 600;
+static SCREEN_WIDTH: u32 = 900;
+static SCREEN_HEIGHT: u32 = 700;
// handle the annoying Rect i32
macro_rules! rect(
@@ -42,40 +41,34 @@ fn get_centered_rect(rect_width: u32, rect_height: u32, cons_width: u32, cons_he
let cy = (SCREEN_HEIGHT as i32 - h) / 2;
rect!(cx, cy, w, h)
}
-
fn run(font_path: &Path) -> Result<(), String> {
- let sdl_context = sdl2::init()?;
- let video_subsys = sdl_context.video()?;
+ let sdl = sdl2::init()?;
+ let video_subsystem = sdl.video()?;
let ttf_context = sdl2::ttf::init().map_err(|e| e.to_string())?;
-
- let mut window = video_subsys
- .window("SDL2_TTF Example", SCREEN_WIDTH, SCREEN_HEIGHT)
+ let mut window = video_subsystem
+ .window("TOY", SCREEN_WIDTH, SCREEN_HEIGHT)
.resizable()
.opengl()
.build()
.map_err(|e| e.to_string())?;
-
window.set_opacity(0.5)?;
-
let mut canvas = window.into_canvas().build().map_err(|e| e.to_string())?;
let texture_creator = canvas.texture_creator();
- // Load a font
let mut font = ttf_context.load_font(font_path, 64)?;
font.set_style(sdl2::ttf::FontStyle::BOLD);
- // render a surface, and convert it to a texture bound to the canvas
let surface = font
- .render("Hello Rust!")
+ .render("TESTING")
.blended_wrapped(Color::RGBA(255, 0, 0, 255), 500)
.map_err(|e| e.to_string())?;
+
let texture = texture_creator
.create_texture_from_surface(&surface)
.map_err(|e| e.to_string())?;
- canvas.set_draw_color(Color::RGBA(195, 217, 255, 255));
+ canvas.set_draw_color(Color::RGBA(255, 0, 0, 255));
canvas.clear();
-
let TextureQuery { width, height, .. } = texture.query();
// If the example text is too big for the screen, downscale it (and center irregardless)
@@ -90,33 +83,29 @@ fn run(font_path: &Path) -> Result<(), String> {
canvas.copy(&texture, None, Some(target))?;
canvas.present();
- 'mainloop: loop {
- for event in sdl_context.event_pump()?.poll_iter() {
+ 'main: loop {
+ for event in sdl.event_pump()?.poll_iter() {
match event {
Event::KeyDown {
keycode: Some(Keycode::Escape),
..
}
- | Event::Quit { .. } => break 'mainloop,
+ | Event::Quit { .. } => break 'main,
_ => {}
}
}
}
-
Ok(())
}
fn main() -> Result<(), String> {
let args: Vec<_> = env::args().collect();
-
println!("linked sdl2_ttf: {}", sdl2::ttf::get_linked_version());
-
if args.len() < 2 {
println!("Usage: ./demo font.[ttf|ttc|fon]")
} else {
let path: &Path = Path::new(&args[1]);
run(path)?;
}
-
Ok(())
}
