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X11+Windows: Guess initial DPI factor (#583)

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* X11: Guess initial DPI factor

* Windows: Guess initial DPI factor
This commit is contained in:
Francesca Frangipane 2018-07-01 11:01:46 -04:00 • committed by GitHub
parent 85ee422acd
commit 2f7321a076
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13 changed files with 183 additions and 82 deletions
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20
src/platform/windows/util.rs
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@ -2,8 +2,8 @@ use std::{self, mem, ptr, slice};
use std::ops::BitAnd;
use winapi::ctypes::wchar_t;
use winapi::shared::minwindef::DWORD;
use winapi::shared::windef::{HWND, RECT};
use winapi::shared::minwindef::{BOOL, DWORD};
use winapi::shared::windef::{HWND, POINT, RECT};
use winapi::um::errhandlingapi::GetLastError;
use winapi::um::winbase::{
FormatMessageW,
@ -38,15 +38,23 @@ pub fn wchar_ptr_to_string(wchar: *const wchar_t) -> String {
wchar_to_string(wchar_slice)
}
pub fn get_window_rect(hwnd: HWND) -> Option<RECT> {
let mut rect: RECT = unsafe { mem::uninitialized() };
if unsafe { winuser::GetWindowRect(hwnd, &mut rect) } != 0 {
Some(rect)
pub unsafe fn status_map<T, F: FnMut(&mut T) -> BOOL>(mut fun: F) -> Option<T> {
let mut data: T = mem::uninitialized();
if fun(&mut data) != 0 {
Some(data)
} else {
None
}
}
pub fn get_cursor_pos() -> Option<POINT> {
unsafe { status_map(|cursor_pos| winuser::GetCursorPos(cursor_pos)) }
}
pub fn get_window_rect(hwnd: HWND) -> Option<RECT> {
unsafe { status_map(|rect| winuser::GetWindowRect(hwnd, rect)) }
}
// This won't be needed anymore if we just add a derive to winapi.
pub fn rect_eq(a: &RECT, b: &RECT) -> bool {
let left_eq = a.left == b.left;