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use std::ffi::{CString, OsStr, OsString};
use std::mem;
use std::os::windows::ffi::{OsStrExt, OsStringExt};
use std::ptr;
use std::slice;
use winapi::ctypes::c_void;
use winapi::shared::guiddef::REFIID;
use winapi::shared::minwindef::{HMODULE, UINT};
use winapi::shared::ntdef::{HRESULT, LPWSTR};
use winapi::shared::windef::HMONITOR;
use winapi::shared::winerror::SUCCEEDED;
use winapi::um::fileapi::{CreateFileA, GetFileType, OPEN_EXISTING};
use winapi::um::handleapi::INVALID_HANDLE_VALUE;
use winapi::um::libloaderapi::{GetModuleHandleW, GetProcAddress, LoadLibraryW};
use winapi::um::processenv::{GetStdHandle, SetStdHandle};
use winapi::um::shellscalingapi::{MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS};
use winapi::um::unknwnbase::IUnknown;
use winapi::um::winbase::{FILE_TYPE_UNKNOWN, STD_ERROR_HANDLE, STD_OUTPUT_HANDLE};
use winapi::um::wincon::{AttachConsole, ATTACH_PARENT_PROCESS};
use winapi::um::winnt::{FILE_SHARE_WRITE, GENERIC_READ, GENERIC_WRITE};
use log::error;
use super::error::Error;
pub fn as_result(hr: HRESULT) -> Result<(), Error> {
if SUCCEEDED(hr) {
Ok(())
} else {
Err(Error::Hr(hr))
}
}
impl From<HRESULT> for Error {
fn from(hr: HRESULT) -> Error {
Error::Hr(hr)
}
}
pub trait ToWide {
fn to_wide_sized(&self) -> Vec<u16>;
fn to_wide(&self) -> Vec<u16>;
}
impl<T> ToWide for T
where
T: AsRef<OsStr>,
{
fn to_wide_sized(&self) -> Vec<u16> {
self.as_ref().encode_wide().collect()
}
fn to_wide(&self) -> Vec<u16> {
self.as_ref().encode_wide().chain(Some(0)).collect()
}
}
pub trait FromWide {
fn to_u16_slice(&self) -> &[u16];
fn to_os_string(&self) -> OsString {
OsStringExt::from_wide(self.to_u16_slice())
}
fn from_wide(&self) -> Option<String> {
String::from_utf16(self.to_u16_slice()).ok()
}
}
impl FromWide for LPWSTR {
fn to_u16_slice(&self) -> &[u16] {
unsafe {
let mut len = 0;
while *self.offset(len) != 0 {
len += 1;
}
slice::from_raw_parts(*self, len as usize)
}
}
}
impl FromWide for [u16] {
fn to_u16_slice(&self) -> &[u16] {
self
}
}
type GetDpiForSystem = unsafe extern "system" fn() -> UINT;
type GetDpiForMonitor = unsafe extern "system" fn(HMONITOR, MONITOR_DPI_TYPE, *mut UINT, *mut UINT);
type SetProcessDpiAwareness = unsafe extern "system" fn(PROCESS_DPI_AWARENESS) -> HRESULT;
type DCompositionCreateDevice2 = unsafe extern "system" fn(
renderingDevice: *const IUnknown,
iid: REFIID,
dcompositionDevice: *mut *mut c_void,
) -> HRESULT;
type CreateDXGIFactory2 =
unsafe extern "system" fn(Flags: UINT, riid: REFIID, ppFactory: *mut *mut c_void) -> HRESULT;
#[allow(non_snake_case)]
pub struct OptionalFunctions {
pub GetDpiForSystem: Option<GetDpiForSystem>,
pub GetDpiForMonitor: Option<GetDpiForMonitor>,
pub SetProcessDpiAwareness: Option<SetProcessDpiAwareness>,
pub DCompositionCreateDevice2: Option<DCompositionCreateDevice2>,
pub CreateDXGIFactory2: Option<CreateDXGIFactory2>,
}
#[allow(non_snake_case)]
fn load_optional_functions() -> OptionalFunctions {
macro_rules! load_function {
($lib: expr, $function: ident, $min_windows_version: expr) => {{
let name = stringify!($function);
let cstr = CString::new(name).unwrap();
let function_ptr = unsafe { GetProcAddress($lib, cstr.as_ptr()) };
if function_ptr.is_null() {
error!(
"Could not load `{}`. Windows {} or later is needed",
name, $min_windows_version
);
} else {
let function = unsafe { mem::transmute::<_, $function>(function_ptr) };
$function = Some(function);
}
}};
}
fn load_library(name: &str) -> HMODULE {
let encoded_name = name.to_wide();
let library = unsafe { GetModuleHandleW(encoded_name.as_ptr()) };
if !library.is_null() {
return library;
}
unsafe { LoadLibraryW(encoded_name.as_ptr()) }
}
let shcore = load_library("shcore.dll");
let user32 = load_library("user32.dll");
let dcomp = load_library("dcomp.dll");
let dxgi = load_library("dxgi.dll");
let mut GetDpiForSystem = None;
let mut GetDpiForMonitor = None;
let mut SetProcessDpiAwareness = None;
let mut DCompositionCreateDevice2 = None;
let mut CreateDXGIFactory2 = None;
if shcore.is_null() {
error!("No shcore.dll");
} else {
load_function!(shcore, SetProcessDpiAwareness, "8.1");
load_function!(shcore, GetDpiForMonitor, "8.1");
}
if user32.is_null() {
error!("No user32.dll");
} else {
load_function!(user32, GetDpiForSystem, "10");
}
if !dcomp.is_null() {
load_function!(dcomp, DCompositionCreateDevice2, "8.1");
}
if !dxgi.is_null() {
load_function!(dxgi, CreateDXGIFactory2, "8.1");
}
OptionalFunctions {
GetDpiForSystem,
GetDpiForMonitor,
SetProcessDpiAwareness,
DCompositionCreateDevice2,
CreateDXGIFactory2,
}
}
lazy_static! {
pub static ref OPTIONAL_FUNCTIONS: OptionalFunctions = load_optional_functions();
}
pub(crate) const CLASS_NAME: &str = "druid";
#[macro_export]
macro_rules! accel {
( $( $fVirt:expr, $key:expr, $cmd:expr, )* ) => {
[
$(
ACCEL { fVirt: $fVirt | FVIRTKEY, key: $key as WORD, cmd: $cmd as WORD },
)*
]
}
}
pub(crate) fn attach_console() {
unsafe {
let stdout = GetStdHandle(STD_OUTPUT_HANDLE);
if stdout != INVALID_HANDLE_VALUE && GetFileType(stdout) != FILE_TYPE_UNKNOWN {
return;
}
if AttachConsole(ATTACH_PARENT_PROCESS) > 0 {
let name = CString::new("CONOUT$").unwrap();
let chnd = CreateFileA(
name.as_ptr(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_WRITE,
ptr::null_mut(),
OPEN_EXISTING,
0,
ptr::null_mut(),
);
if chnd == INVALID_HANDLE_VALUE {
return;
}
SetStdHandle(STD_OUTPUT_HANDLE, chnd);
SetStdHandle(STD_ERROR_HANDLE, chnd);
}
}
}