Aspects


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Direct3d

Direct3D is a high-performance, COM-based API for accessing graphics hardware (GPUs) in a device-independent way on Microsoft platforms.

Gdi

Graphics Device Interface (GDI) is a device-independent, pure software graphics API under the Windows operating system for drawing graphic primitives and text



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Example

So decide what you want to use direct3d is significaly faster than gdi

from question  

Should I use Direct3D or just Windows GDI for a fancy/high-perf Win32 app UI?

Imho the right way to go is direct3d or opengl but given delphi is windows only maybe direct3d is better;delphi was introduced exactly because the gdi is not good at such tasks

from question  

Delphi 6: Can native Delphi do smooth graphics like Flash?

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