73 lines
2.1 KiB
Rust
73 lines
2.1 KiB
Rust
use crate::{GraphicsContextImpl, SwBufError};
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use raw_window_handle::Win32WindowHandle;
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use std::os::raw::c_int;
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use windows_sys::Win32::Foundation::HWND;
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use windows_sys::Win32::Graphics::Gdi::{
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StretchDIBits, BITMAPINFOHEADER, BI_BITFIELDS, RGBQUAD, HDC,
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ValidateRect, GetDC, SRCCOPY, DIB_RGB_COLORS,
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};
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pub struct Win32Impl {
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window: HWND,
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dc: HDC,
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}
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// Wrap this so we can have a proper number of bmiColors to write in
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// From minifb
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#[repr(C)]
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struct BitmapInfo {
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pub bmi_header: BITMAPINFOHEADER,
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pub bmi_colors: [RGBQUAD; 3],
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}
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impl Win32Impl {
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pub unsafe fn new(handle: &Win32WindowHandle) -> Result<Self, crate::SwBufError> {
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let dc = GetDC(handle.hwnd as HWND);
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if dc == 0 {
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return Err(SwBufError::PlatformError(Some("Device Context is null".into()), None));
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}
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Ok(
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Self {
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dc,
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window: handle.hwnd as HWND,
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}
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)
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}
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}
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impl GraphicsContextImpl for Win32Impl {
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unsafe fn set_buffer(&mut self, buffer: &[u32], width: u16, height: u16) {
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let mut bitmap_info: BitmapInfo = std::mem::zeroed();
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bitmap_info.bmi_header.biSize = std::mem::size_of::<BITMAPINFOHEADER>() as u32;
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bitmap_info.bmi_header.biPlanes = 1;
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bitmap_info.bmi_header.biBitCount = 32;
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bitmap_info.bmi_header.biCompression = BI_BITFIELDS;
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bitmap_info.bmi_header.biWidth = width as i32;
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bitmap_info.bmi_header.biHeight = -(height as i32);
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bitmap_info.bmi_colors[0].rgbRed = 0xff;
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bitmap_info.bmi_colors[1].rgbGreen = 0xff;
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bitmap_info.bmi_colors[2].rgbBlue = 0xff;
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StretchDIBits(
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self.dc,
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0,
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0,
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width as c_int,
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height as c_int,
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0,
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0,
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width as c_int,
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height as c_int,
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std::mem::transmute(buffer.as_ptr()),
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std::mem::transmute(&bitmap_info),
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DIB_RGB_COLORS,
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SRCCOPY,
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);
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ValidateRect(self.window, std::ptr::null_mut());
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}
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}
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