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AlphaBlend for all O/S - Originally by Carles

Submitted on: 2/14/2015 12:30:00 PM
By: LaVolpe (from psc cd)  
Level: Intermediate
User Rating: By 12 Users
Compatibility: VB 5.0, VB 6.0
Views: 2136
     (Updated) Carles posted a very excellent alphablend & stretch routine that did not rely on the AlphaBlend API. Original post is txtCodeId=60424. This is my spin on his code adding some functionality not previously available. Changes include blending non-32bit images, using clipping to speed up some stretched images, adding options to stretch portions of images, offering a global alpha blend option along with per pixel alphas. However, the added overhead can prove to be slightly slower than Carles' original routines. You should test & compare against his original code. ALL VOTES SHOULD GO to his post (txtCodeId=60424). Modified 23Jan/22:30zulu to handle negative DC offsets & fix known calculation errors. Tweaked 24Jan/1609z for speed. 26Jan/1700z: final safety checks added; minor speed improvements

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