large bitmap
- Posted by tone.skoda at siol.net
Feb 05, 2002
This is a multi-part message in MIME format.
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First, how can I read only a part of bitmap? Let's say I have a very large
bitmap, 100MB, and I want to only read one rectangle out of it.
This is Windows bitmap (I am a little confused what types of bitmaps are there,
DIB?, ...)
Second, I want to display that large bitmap zoomed out. I was thinking I would
only read every third byte from file, or whatever zoom there is, so that loading
would be much faster, especially if bitmap would be very zoomed out.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-2">
<META content="MSHTML 5.50.4522.1800" name=GENERATOR>
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<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>First, how can I read only a part of bitmap? Let's
say I have a very large bitmap, 100MB, and I want to only read one rectangle out
of it.<BR>This is Windows bitmap (I am a little confused what types of bitmaps
are there, DIB?, ...)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Second, I want to display that large bitmap zoomed
out. I was thinking I would only read every third byte from file, or whatever
zoom there is, so that loading would be much faster, especially if bitmap would
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