Lines Matching defs:alpha
680 // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
693 const unsigned char *alpha = m_hasAlpha ? image.GetAlpha() + (h - 1)*w
700 if ( alpha )
705 // all channels by alpha value for use with ::AlphaBlend.
706 const unsigned char a = *alpha++;
714 else // no alpha channel
728 if ( alpha )
729 alpha -= 2*w;
764 unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() + (h - 1)*w
780 if ( alpha )
782 // wxImage uses non premultiplied alpha so undo
785 *alpha++ = a;
802 if ( alpha )
803 alpha -= 2*w;