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API's AlphaBlend emulation

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Submitted on: 2/11/2015 12:26:00 PM
By: Carles P.V. (from psc cd)  
Level: Intermediate
User Rating: By 29 Users
Compatibility: VB 4.0 (32-bit), VB 5.0, VB 6.0
Views: 1779
 
     A little module: AlphaBlt() and AlphaBlend() functions will let you render 32-bit-alpha bitmaps onto a given DC. Use first one (faster) when rendering onto solid-color surfaces. Use second one for a complete emulation of API's AlphaBlend. // W9x and WNT systems compatible, I hope. // ~115Kb. __________________________________________________ Update #1. Added cDIB32 class (simplified version accepting only 32-bit DIB sections). Useful in case loading a resource bitmap. All properties have been preserved to allow create/edit custom alpha DIBs. Thanks go to redbird77 for the new CreateFromResourceBitmap() function. Note: compile first if you want to test this function! (also you'll get about 10 times faster results). __________________________________________________ Update #2. Added a mini-tool to export 32-bit bitmaps from icon/cursor resources (XP format). __________________________________________________ Update #3 (2005.05.03). Speed up: checked special alpha values (full opaque and full transparent).

 
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