DDRAW levels of resolution and picture quality

Win CE 5.0:

Does ddraw.dll support any other resolutions than 1/1, 1/2 and 1/4 without
streching the image?

When you set the size of the video window to height 5/6 of full screen and
width 5/6 of full screen. ddraw.dll shrinks the video input to 1/2 and the
streches the image to 5/6 by 5/6 of full screen. Thereby you get the same
picture quality as you would if the video window size would be 1/2 x 1/2 of
full screen. The video image is just streched. I want ddraw.dll to only
shrink the video input to 2/3 of full screen so the picture quality doesn't
become so poor. In pixels full screen is 800 x 600 px. The size of the video
window which we want to use it 560 x 370 px.

Is it possible to improve the quality of the picture somehow?
.

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