[reactos] 01/01: [3DTEXT] Fix 3dtext.scr using near 100% CPU (#4125)

[Doug Lyons]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=5c9fdcb1de7faa49c2af34...

commit 5c9fdcb1de7faa49c2af341631217baa7b9fe552
Author:     Doug Lyons [e-mail]
AuthorDate: Thu Dec 2 12:55:39 2021 -0600
Commit:     GitHub [e-mail]
CommitDate: Thu Dec 2 19:55:39 2021 +0100

[3DTEXT] Fix 3dtext.scr using near 100% CPU (#4125)

CORE-17866, CORE-8217
---
 base/applications/screensavers/3dtext/3dtext.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/base/applications/screensavers/3dtext/3dtext.c b/base/applications/screensavers/3dtext/3dtext.c
index c1f908ca37a..b46fcce6905 100644
--- a/base/applications/screensavers/3dtext/3dtext.c
+++ b/base/applications/screensavers/3dtext/3dtext.c
@@ -41,6 +41,9 @@ GLfloat extentY = 0.0f;

HINSTANCE hInstance;
 BOOL fullscreen = FALSE;
+UINT uTimerID;                                          // SetTimer Actual ID
+#define APP_TIMER             1                         // Graphics Update Timer ID
+#define APP_TIMER_INTERVAL    (USER_TIMER_MINIMUM * 5)  // Graphics Update Interval

// Build Our Bitmap Font
 GLvoid BuildFont(GLvoid)
@@ -338,12 +341,18 @@ ScreenSaverProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

// Initialize The GL Screen Using Screen Info
             InitGL(Screen.right, Screen.bottom);
+
+            // Create Graphics update timer
+            uTimerID = SetTimer(hWnd, APP_TIMER, APP_TIMER_INTERVAL, NULL);
             break;

case WM_DESTROY:
             // Disable Fullscreen Mode
             ChangeDisplaySettings(NULL, 0);

+            // Delete the Update Timer
+            KillTimer(hWnd, uTimerID);
+
             // Deletes The Font Display List
             KillFont();

@@ -360,6 +369,8 @@ ScreenSaverProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
         case WM_PAINT:
             DrawGLScene();
             SwapBuffers(hDC);
+            // Mark this window as updated, so the OS won't ask us to update it again.
+            ValidateRect(hWnd, NULL);
             break;

case WM_SIZE: // Resizing The Screen
@@ -367,6 +378,11 @@ ScreenSaverProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
             ReSizeGLScene(LOWORD(lParam), HIWORD(lParam));
             break;

+        case WM_TIMER:
+            // Used to update graphic based on timer udpate interval
+            InvalidateRect(hWnd, NULL, TRUE);
+            break;
+
         default:
             // Pass Windows Messages to the default screensaver window procedure
             return DefScreenSaverProc(hWnd, message, wParam, lParam);