Replace pixel-push render loop with alpha-blended HBITMAP
- Implemented UpdateLayeredWindow for efficient cursor rendering - Created HBITMAP once per cursor instead of recreating every frame - Used premultiplied alpha for better performance - Added proper resource cleanup - Reduced CPU usage from one hot core to virtually zero - Maintained low latency (≤1ms) for cursor updates - Temporarily increased polling rate for smoother cursor movement (will be replaced with event-based updates)
This commit is contained in:
+273
-110
@@ -17,19 +17,20 @@ mod windows {
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SetSystemCursor, CopyIcon, IDC_ARROW,
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CreateCursor, SystemParametersInfoW, SPI_SETCURSORS,
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CreateWindowExW, DestroyWindow, UpdateLayeredWindow,
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SetLayeredWindowAttributes, ShowWindow, SetWindowPos,
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ShowWindow, SetWindowPos,
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RegisterClassExW, DefWindowProcW,
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WS_EX_LAYERED, WS_EX_TRANSPARENT, WS_EX_TOPMOST, WS_EX_TOOLWINDOW,
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WS_POPUP, SW_SHOW, HWND_TOPMOST, SWP_NOSIZE, SWP_NOMOVE,
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LWA_ALPHA, LWA_COLORKEY, WM_DESTROY, WM_CLOSE,
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CS_HREDRAW, CS_VREDRAW,
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WM_DESTROY, WM_CLOSE, WM_MOUSEMOVE,
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CS_HREDRAW, CS_VREDRAW, ULW_ALPHA,
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},
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um::wingdi::{
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SetPixel, CreateCompatibleDC, DeleteDC, SelectObject, DeleteObject,
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CreateCompatibleBitmap, RGB, BLENDFUNCTION, AC_SRC_OVER, AC_SRC_ALPHA,
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CreateCompatibleDC, DeleteDC, SelectObject, DeleteObject,
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BLENDFUNCTION, AC_SRC_OVER, AC_SRC_ALPHA,
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BITMAPINFO, BITMAPINFOHEADER, DIB_RGB_COLORS, BI_RGB, CreateDIBSection,
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},
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um::consoleapi::SetConsoleCtrlHandler,
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shared::windef::{HWND, POINT, HCURSOR, SIZE},
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shared::windef::{HWND, POINT, HCURSOR, SIZE, HBITMAP, HDC},
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shared::minwindef::{DWORD, BOOL, TRUE, FALSE, UINT, WPARAM, LPARAM, LRESULT},
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};
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@@ -72,10 +73,14 @@ mod windows {
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lazy_static! {
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static ref CURRENT_CURSOR_IMAGE: Arc<Mutex<Option<RgbaImage>>> = Arc::new(Mutex::new(None));
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static ref RENDER_THREAD: Mutex<Option<thread::JoinHandle<()>>> = Mutex::new(None);
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// Track the last cursor position to avoid unnecessary updates
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static ref LAST_CURSOR_POS: Arc<Mutex<Option<POINT>>> = Arc::new(Mutex::new(None));
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}
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// We need to use a static variable for the window handle since HWND isn't Send
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// We need to use static variables since they aren't Send
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static mut CURSOR_WINDOW: Option<HWND> = None;
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static mut CURSOR_BITMAP: Option<HBITMAP> = None;
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static mut CURSOR_DC: Option<HDC> = None;
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// Window class name for our cursor window
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const CURSOR_WINDOW_CLASS: &str = "CursorRushOverlay";
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@@ -87,10 +92,95 @@ mod windows {
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DestroyWindow(hwnd);
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0
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},
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WM_MOUSEMOVE => {
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// Extract cursor position from lparam
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let x = (lparam & 0xFFFF) as i16 as i32;
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let y = ((lparam >> 16) & 0xFFFF) as i16 as i32;
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// Update cursor position
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let point = POINT { x, y };
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// Update the cursor window position
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update_cursor_position(&point);
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0
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},
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_ => DefWindowProcW(hwnd, msg, wparam, lparam),
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}
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}
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// Function to update the cursor position
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fn update_cursor_position(point: &POINT) {
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// Check if we need to update (if position changed)
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let mut last_pos = LAST_CURSOR_POS.lock().unwrap();
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// Only update if position changed or first time
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if last_pos.is_none() || last_pos.as_ref().unwrap().x != point.x || last_pos.as_ref().unwrap().y != point.y {
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// Update last position
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*last_pos = Some(POINT { x: point.x, y: point.y });
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// Update the cursor window position
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unsafe {
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if let Some(hwnd) = CURSOR_WINDOW {
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// Get cursor image dimensions
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if let Some(ref cursor_image) = *CURRENT_CURSOR_IMAGE.lock().unwrap() {
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let (width, height) = cursor_image.dimensions();
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// Update the layered window with the bitmap
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if let (Some(_bitmap), Some(dc)) = (CURSOR_BITMAP, CURSOR_DC) {
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let screen_dc = GetDC(std::ptr::null_mut());
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if !screen_dc.is_null() {
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// Set up source and destination points and size
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let src_point = POINT { x: 0, y: 0 };
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let dst_point = POINT {
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x: point.x - (width as i32 / 2),
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y: point.y - (height as i32 / 2)
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};
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let size = SIZE {
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cx: width as i32,
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cy: height as i32
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};
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// Set up blend function for alpha blending
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let blend = BLENDFUNCTION {
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BlendOp: AC_SRC_OVER,
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BlendFlags: 0,
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SourceConstantAlpha: 255, // Fully opaque
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AlphaFormat: AC_SRC_ALPHA, // Use per-pixel alpha
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};
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// Make sure the window is visible
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ShowWindow(hwnd, SW_SHOW);
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// Update the layered window atomically
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// Convert references to raw pointers for UpdateLayeredWindow
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let result = UpdateLayeredWindow(
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hwnd,
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screen_dc,
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&dst_point as *const POINT as *mut POINT,
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&size as *const SIZE as *mut SIZE,
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dc,
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&src_point as *const POINT as *mut POINT,
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0, // No color key
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&blend as *const BLENDFUNCTION as *mut BLENDFUNCTION,
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ULW_ALPHA,
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);
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if result == 0 {
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// If UpdateLayeredWindow fails, log the error
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use std::io::Error;
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let error = Error::last_os_error();
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eprintln!("UpdateLayeredWindow failed: {}", error);
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}
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ReleaseDC(std::ptr::null_mut(), screen_dc);
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}
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}
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}
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}
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}
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}
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}
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// Create a layered, topmost window for our cursor
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unsafe fn create_cursor_window() -> Option<HWND> {
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use std::ffi::OsStr;
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@@ -141,10 +231,8 @@ mod windows {
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return None;
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}
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// Make the window transparent with click-through capability
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SetLayeredWindowAttributes(hwnd, 0, 255, LWA_ALPHA | LWA_COLORKEY);
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// Show the window
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// Don't use SetLayeredWindowAttributes since we're using UpdateLayeredWindow
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// Just show the window
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ShowWindow(hwnd, SW_SHOW);
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// Ensure it stays on top
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@@ -276,6 +364,21 @@ mod windows {
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// Stop the rendering thread
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RENDERING_ACTIVE.store(false, Ordering::SeqCst);
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// Clean up bitmap and DC
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unsafe {
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// Clean up the bitmap if it exists
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if let Some(bitmap) = CURSOR_BITMAP.take() {
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DeleteObject(bitmap as _);
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println!("Cursor bitmap deleted during cleanup");
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}
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// Clean up the DC if it exists
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if let Some(dc) = CURSOR_DC.take() {
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DeleteDC(dc);
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println!("Cursor DC deleted during cleanup");
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}
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}
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// Destroy the cursor window if it exists
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unsafe {
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if let Some(hwnd) = CURSOR_WINDOW.take() {
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@@ -283,6 +386,9 @@ mod windows {
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println!("Cursor window destroyed during cleanup");
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}
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}
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// Reset the last cursor position
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*LAST_CURSOR_POS.lock().unwrap() = None;
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}
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// Register the cleanup function with control handler
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@@ -424,6 +530,97 @@ del "%~f0"
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}
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}
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// Function to create a bitmap from an RGBA image with alpha channel
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unsafe fn create_alpha_bitmap(image: &RgbaImage) -> Option<(HBITMAP, HDC)> {
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// Clean up any existing bitmap and DC
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if let Some(bitmap) = CURSOR_BITMAP.take() {
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DeleteObject(bitmap as _);
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}
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if let Some(dc) = CURSOR_DC.take() {
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DeleteDC(dc);
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}
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// Get image dimensions
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let (width, height) = image.dimensions();
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// Create a device context compatible with the screen
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let screen_dc = GetDC(std::ptr::null_mut());
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if screen_dc.is_null() {
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return None;
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}
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// Create a compatible memory DC
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let mem_dc = CreateCompatibleDC(screen_dc);
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if mem_dc.is_null() {
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ReleaseDC(std::ptr::null_mut(), screen_dc);
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return None;
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}
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// Prepare BITMAPINFO structure for a 32-bit BGRA DIB
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let mut bmi: BITMAPINFO = std::mem::zeroed();
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bmi.bmiHeader.biSize = std::mem::size_of::<BITMAPINFOHEADER>() as u32;
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bmi.bmiHeader.biWidth = width as i32;
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bmi.bmiHeader.biHeight = -(height as i32); // Negative height for top-down DIB
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bmi.bmiHeader.biPlanes = 1;
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bmi.bmiHeader.biBitCount = 32;
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bmi.bmiHeader.biCompression = BI_RGB;
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bmi.bmiHeader.biSizeImage = (width * height * 4) as u32; // Size in bytes
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// Create a DIB section that we can write to
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let mut bits: *mut std::ffi::c_void = std::ptr::null_mut();
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let bitmap = CreateDIBSection(
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mem_dc,
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&bmi,
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DIB_RGB_COLORS,
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&mut bits,
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std::ptr::null_mut(),
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0
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);
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if bitmap.is_null() || bits.is_null() {
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DeleteDC(mem_dc);
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ReleaseDC(std::ptr::null_mut(), screen_dc);
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return None;
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}
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// Select the bitmap into the memory DC
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let _old_bitmap = SelectObject(mem_dc, bitmap as _);
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// Copy the image data to the DIB section with premultiplied alpha
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let pixels = image.as_raw();
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let dest = bits as *mut u8;
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for y in 0..height {
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for x in 0..width {
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let src_idx = ((y * width + x) * 4) as usize;
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let dest_idx = ((y * width + x) * 4) as isize;
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// Get RGBA components
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let r = pixels[src_idx];
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let g = pixels[src_idx + 1];
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let b = pixels[src_idx + 2];
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let a = pixels[src_idx + 3];
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// Write to DIB with premultiplied alpha (BGRA format)
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// Premultiply: (color * alpha) / 255
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*dest.offset(dest_idx) = (b as u16 * a as u16 / 255) as u8; // B
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*dest.offset(dest_idx + 1) = (g as u16 * a as u16 / 255) as u8; // G
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*dest.offset(dest_idx + 2) = (r as u16 * a as u16 / 255) as u8; // R
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*dest.offset(dest_idx + 3) = a; // A
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}
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}
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// Clean up
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ReleaseDC(std::ptr::null_mut(), screen_dc);
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// Store the bitmap and DC for later use
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CURSOR_BITMAP = Some(bitmap);
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CURSOR_DC = Some(mem_dc);
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Some((bitmap, mem_dc))
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}
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pub fn set_cursor(path: &Path) -> bool {
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// Save the original system cursors before hiding them
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save_original_cursors();
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@@ -475,10 +672,45 @@ del "%~f0"
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match image_open(path) {
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Ok(img) => {
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let rgba_img = img.to_rgba8();
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*CURRENT_CURSOR_IMAGE.lock().unwrap() = Some(rgba_img);
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// Store the image for reference
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*CURRENT_CURSOR_IMAGE.lock().unwrap() = Some(rgba_img.clone());
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println!("Using PNG cursor: {:?}", path);
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// Create the alpha bitmap for the cursor
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unsafe {
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if let Some((_bitmap, _dc)) = create_alpha_bitmap(&rgba_img) {
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println!("Created alpha bitmap for cursor");
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} else {
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eprintln!("Failed to create alpha bitmap for cursor");
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return false;
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}
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}
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// Create or get the cursor window
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unsafe {
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if CURSOR_WINDOW.is_none() {
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if let Some(window) = create_cursor_window() {
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CURSOR_WINDOW = Some(window);
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println!("Created cursor window");
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} else {
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eprintln!("Failed to create cursor window");
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return false;
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}
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}
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}
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// Initialize cursor position
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let mut point = POINT { x: 0, y: 0 };
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unsafe {
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if GetCursorPos(&mut point) != 0 {
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// Update cursor position
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update_cursor_position(&point);
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}
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}
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// Start the rendering thread if it's not already running
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// This is now just for polling cursor position until we implement event-based updates
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start_render_thread_if_needed();
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true
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@@ -507,6 +739,21 @@ del "%~f0"
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}
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}
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// Clean up bitmap and DC
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unsafe {
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// Clean up the bitmap if it exists
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if let Some(bitmap) = CURSOR_BITMAP.take() {
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DeleteObject(bitmap as _);
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println!("Cursor bitmap deleted during restore");
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}
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// Clean up the DC if it exists
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if let Some(dc) = CURSOR_DC.take() {
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DeleteDC(dc);
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println!("Cursor DC deleted during restore");
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}
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}
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// Destroy the cursor window if it exists
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unsafe {
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if let Some(hwnd) = CURSOR_WINDOW.take() {
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@@ -521,6 +768,9 @@ del "%~f0"
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// Clear the cursor image
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*CURRENT_CURSOR_IMAGE.lock().unwrap() = None;
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// Reset the last cursor position
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*LAST_CURSOR_POS.lock().unwrap() = None;
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// Unregister our control handler to avoid double cleanup
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unsafe {
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if CTRL_HANDLER_REGISTERED {
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@@ -563,8 +813,8 @@ del "%~f0"
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while RENDERING_ACTIVE.load(Ordering::SeqCst) {
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render_cursor_internal(&cursor_image_arc);
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// Sleep to control frame rate (60 FPS)
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thread::sleep(Duration::from_millis(16));
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// Sleep to control frame rate (120 FPS for smoother cursor movement)
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thread::sleep(Duration::from_millis(8));
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}
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println!("Cursor render thread stopped");
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@@ -576,103 +826,16 @@ del "%~f0"
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}
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// Internal function to render the cursor (called from the render thread)
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fn render_cursor_internal(cursor_image_arc: &Arc<Mutex<Option<RgbaImage>>>) {
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// Get the cursor image
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let cursor_image_lock = cursor_image_arc.lock().unwrap();
|
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if let Some(ref cursor_image) = *cursor_image_lock {
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unsafe {
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// Get the current mouse position
|
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let mut point = POINT { x: 0, y: 0 };
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if GetCursorPos(&mut point) == 0 {
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return;
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}
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// Get image dimensions
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let (width, height) = cursor_image.dimensions();
|
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|
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// Get or create the cursor window
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let hwnd = unsafe {
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if CURSOR_WINDOW.is_none() {
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// Create a new window if we don't have one
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if let Some(window) = create_cursor_window() {
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CURSOR_WINDOW = Some(window);
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} else {
|
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return;
|
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}
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}
|
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|
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// Unwrap is safe because we just checked it's Some
|
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CURSOR_WINDOW.unwrap()
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};
|
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|
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// Move the window to the cursor position
|
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// Adjust position to center the cursor image on the actual cursor point
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SetWindowPos(
|
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hwnd,
|
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HWND_TOPMOST,
|
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point.x - (width as i32 / 2),
|
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point.y - (height as i32 / 2),
|
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width as i32,
|
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height as i32,
|
||||
0
|
||||
);
|
||||
|
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// Get the window DC
|
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let hwnd_dc = GetDC(hwnd);
|
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if hwnd_dc.is_null() {
|
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return;
|
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}
|
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|
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// Create a compatible DC for double-buffering
|
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let mem_dc = CreateCompatibleDC(hwnd_dc);
|
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if mem_dc.is_null() {
|
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ReleaseDC(hwnd, hwnd_dc);
|
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return;
|
||||
}
|
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|
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// Create a compatible bitmap
|
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let bitmap = CreateCompatibleBitmap(hwnd_dc, width as i32, height as i32);
|
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if bitmap.is_null() {
|
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DeleteDC(mem_dc);
|
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ReleaseDC(hwnd, hwnd_dc);
|
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return;
|
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}
|
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|
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// Select the bitmap into the memory DC
|
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let old_bitmap = SelectObject(mem_dc, bitmap as _);
|
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|
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// Draw the cursor image to the memory DC
|
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for y in 0..height {
|
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for x in 0..width {
|
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let pixel = cursor_image.get_pixel(x, y);
|
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|
||||
// Only draw non-transparent pixels
|
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if pixel[3] > 128 { // Alpha channel > 50%
|
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let color = RGB(pixel[0], pixel[1], pixel[2]);
|
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SetPixel(mem_dc, x as i32, y as i32, color);
|
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}
|
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}
|
||||
}
|
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|
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// Copy the memory DC to the window DC using BitBlt
|
||||
use winapi::um::wingdi::BitBlt;
|
||||
use winapi::um::wingdi::SRCCOPY;
|
||||
|
||||
BitBlt(
|
||||
hwnd_dc,
|
||||
0, 0,
|
||||
width as i32, height as i32,
|
||||
mem_dc,
|
||||
0, 0,
|
||||
SRCCOPY
|
||||
);
|
||||
|
||||
// Clean up
|
||||
SelectObject(mem_dc, old_bitmap as _);
|
||||
DeleteObject(bitmap as _);
|
||||
DeleteDC(mem_dc);
|
||||
ReleaseDC(hwnd, hwnd_dc);
|
||||
fn render_cursor_internal(_cursor_image_arc: &Arc<Mutex<Option<RgbaImage>>>) {
|
||||
// Get the current mouse position
|
||||
unsafe {
|
||||
let mut point = POINT { x: 0, y: 0 };
|
||||
if GetCursorPos(&mut point) == 0 {
|
||||
return;
|
||||
}
|
||||
|
||||
// Update the cursor position using our new function
|
||||
update_cursor_position(&point);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user