Avoid a bit of unsafe in Windows backend

src/win32.rs

@@ -61,17 +61,43 @@ impl Win32Impl {
 
     pub(crate) unsafe fn set_buffer(&mut self, buffer: &[u32], width: u16, height: u16) {
         // Create a new bitmap info struct.
-        let mut bitmap_info: BitmapInfo = unsafe { mem::zeroed() };
+        let bmi_header = BITMAPINFOHEADER {
-
+            biSize: mem::size_of::<BITMAPINFOHEADER>() as u32,
-        bitmap_info.bmi_header.biSize = mem::size_of::<BITMAPINFOHEADER>() as u32;
+            biWidth: width as i32,
-        bitmap_info.bmi_header.biPlanes = 1;
+            biHeight: -(height as i32),
-        bitmap_info.bmi_header.biBitCount = 32;
+            biPlanes: 1,
-        bitmap_info.bmi_header.biCompression = BI_BITFIELDS;
+            biBitCount: 32,
-        bitmap_info.bmi_header.biWidth = width as i32;
+            biCompression: BI_BITFIELDS,
-        bitmap_info.bmi_header.biHeight = -(height as i32);
+            biSizeImage: 0,
-        bitmap_info.bmi_colors[0].rgbRed = 0xff;
+            biXPelsPerMeter: 0,
-        bitmap_info.bmi_colors[1].rgbGreen = 0xff;
+            biYPelsPerMeter: 0,
-        bitmap_info.bmi_colors[2].rgbBlue = 0xff;
+            biClrUsed: 0,
+            biClrImportant: 0,
+        };
+        let zero_quad = RGBQUAD {
+            rgbBlue: 0,
+            rgbGreen: 0,
+            rgbRed: 0,
+            rgbReserved: 0,
+        };
+        let bmi_colors = [
+            RGBQUAD {
+                rgbRed: 0xff,
+                ..zero_quad
+            },
+            RGBQUAD {
+                rgbGreen: 0xff,
+                ..zero_quad
+            },
+            RGBQUAD {
+                rgbBlue: 0xff,
+                ..zero_quad
+            },
+        ];
+        let bitmap_info = BitmapInfo {
+            bmi_header,
+            bmi_colors,
+        };
 
         // Stretch the bitmap onto the window.
         // SAFETY: