http://www.newlc.com/topic-3130 Comments for "How to make transparent or semi-transparent in my app" en http://www.newlc.com/topic-3130#comment-9881 <div class="smf-content">Try this<br /><br />Class TGopBitBltAlphaBitmap<br />TGopBitBltAlphaBitmap<br />Support<br />Supported from 7.0 <br /><br />Description<br />An accelerated graphics operation that copies a rectangular region of one bitmap into another using alpha blending values provided in a third bitmap.<br /><br />The way alpha blending works is as follows: if the alpha value is the maximum, the source pixel is opaque, in other words, the full colour of the pixel is written to the destination. If the alpha value is zero, the source pixel is fully transparent, and the destination is left unaltered. Values in-between cause blending with the following formula:<br /><br />Destination = Source*Alpha/max_Alpha + Destination*(max_Alpha-Alpha)/max_Alpha<br /><br />Colour alpha bitmaps specify red, green and blue alpha values for each pixel, greyscale bitmaps specify a single alpha value for each pixel. The maximum alpha value depends on the bitmap's display mode. For example, 255 is the maximum for an EGray256 or EColor16M bitmap. The maximum is less for bitmaps which use fewer bits per colour component.</div> Mon, 04 Apr 2005 14:42:37 +0200 Moker comment 9881 at http://www.newlc.com http://www.newlc.com/topic-3130 <div class="smf-content"></div><p><a href="http://www.newlc.com/topic-3130">read more</a></p> http://www.newlc.com/topic-3130#comments Nokia Series 90 Wed, 06 Oct 2004 20:33:10 +0200 p_jack 4084 at http://www.newlc.com