Time Stretching

Time Stretching – initial

TIMESTRETCH

If this option is checked, DxWnd tries to emulate an accelerated (xn) or decelerated (:n) time flow. The value set in the listbox is the initial value, that can be altered by means of the time control slider in the time panel (see Time Slider). When checked, DxWnd stretches time in the timing API (such as with GetSystemTime()), the query performance APIs, and the Sleep APIs, which are the most common ways to control a program's timing.

Show time stretch

SHOWTIMESTRETCH

When checked, the time stretch ratio is drawn as an overlay in a corner of the screen, sometimes moving to other corners when it is updated.

Fine time adjust

FINETIMING

When checked, the time stretch ratio shows ticks in finer increments, switching from a 50% change with each tick to a 10% change with each tick. This limits the range to 0.5x-2.0x but allows for finer timing control.

Intercept RDTSC opcode

INTERCEPTRDTSC

Program timing is usually determined by system calls that can be easily and safely hooked to stretch the flow of time. There is one possible exception, however: when the program embeds in its assembly the RDTSC assembly instruction opcodes that directly access the hardware clock. This timing value can still be intercepted and manipulated, but using a more delicate technique that searches for the assembly code and replaces it with specific calls. This is why I preferred to make this option available with a dedicated flag to be activated when necessary. The flag should be set whenever adjusting the time stretching option does not alter the time flow.

Stretch timers

STRETCHTIMERS

When checked, the window timers are stretched, namely the user32.dll timers set by SetTimer and the multimedia timers in winmm.dll set by timeSetEvent().

Normalize Performance Counter

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