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 thread  Author  Topic: Display part of BMP image? (*DISPLAY)  (Read 281 times)
5against4
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xx Display part of BMP image? (*DISPLAY)
« Thread started on: Mar 8th, 2017, 07:44am »
While it's possible to display a BMP image with *DISPLAY, is it possible to display just part of an image, i.e. by specifying a pixel range?
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xx Re: Display part of BMP image? (*DISPLAY)
« Reply #1 on: Mar 8th, 2017, 2:08pm »
Check in the TOOLs section.

RETROLIB 12 with BMP sketch tools (array version)

Its actually fairly quick.

bmptocode would actually be more particular to extraction of specific pixels, but I am still reworking it for BBC Basic.

Other than Sprites, I don't know of other methods of extraction and display tools that show partial images, other than the tools I am working on.
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xx Re: Display part of BMP image? (*DISPLAY)
« Reply #2 on: Mar 9th, 2017, 08:24am »
I don't think it's possible to show (only) part of the source image using *DISPLAY (or (*MDiSPLAY), you could do it using the system calls BitBlt or StretchBlt. That would require loading your image into a separate device context, and then copying the section you need to the main display.

If you need help doing that, let me know, and I'll try to put together a bit of example code.

best wishes,

D
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