quoilam/countdown

How quoilam/countdown works

Countdown is a small Win32 desktop application that displays a days-remaining countdown and the current time over a supplied bitmap, placing its window on the Windows desktop. The workflow starts in main.cpp, initializes and creates the window, then runs the message loop; window messages initialize resources, trigger drawing, and clean up on exit. The countdown is calculated against a fixed 2022 date. The graph reflects the sampled runtime source; Windows API behavior is represented only where it provides an external interaction.

Main entry points: Core.cpp Core initialization · MainWindowProcDetail.cpp Window message handler · SetMainWindow.cpp Desktop placement · main.cpp Application entry

Components 17

Startup and lifecycle

Application entry main.cpp
Core initialization Core/Core.cpp
Shared runtime state Premiere/Premiere.cpp
Message loop Core/Core.cpp

Desktop window

Window registration MainWindow/SetMainWindow.cpp
Window creation MainWindow/SetMainWindow.cpp
Window message handler MainWindow/MainWindowProcDetail.cpp
Window initialization MainWindow/MainWindowProcDetail.cpp
Desktop placement MainWindow/SetMainWindow.cpp
Debug output ToolFunc/Exception.cpp
Window cleanup MainWindow/MainWindowProcDetail.cpp

Countdown rendering

Countdown drawing MainWindow/MainWindowProcDetail.cpp
Redraw timer thread MainWindow/MainWindowProcDetail.cpp
Background bitmap R-C.bmp

Other components

Windows desktop and APIs
System clock
Desktop display

Connections 21

Application entry → Core initialization: initializes
Application entry → Message loop: starts
Core initialization → Shared runtime state: sets dimensions
Core initialization → Window registration: registers via
Core initialization → Window creation: creates via
Message loop → Windows desktop and APIs: retrieves messages
Windows desktop and APIs → Window message handler: dispatches messages
Window creation → Windows desktop and APIs: creates and shows
Window message handler → Window initialization: handles create
Window message handler → Countdown drawing: handles paint
Window message handler → Window cleanup: handles destroy
Window initialization → Desktop placement: places window
Desktop placement → Windows desktop and APIs: uses shell APIs
Desktop placement → Debug output: reports errors
Window initialization → Background bitmap: loads bitmap
Window initialization → Redraw timer thread: starts thread
Redraw timer thread → Windows desktop and APIs: invalidates window
Countdown drawing → Background bitmap: copies bitmap
Countdown drawing → System clock: reads local time
Countdown drawing → Desktop display: draws frame
Window cleanup → Windows desktop and APIs: releases resources

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Drawn by GitDiagram on September 28, 2026 from the repository's file tree, README and source files. Read as Markdown ·