Michael Lotz 61ed28ee13 * All drawing modes except for B_OP_COPY should respect transparent pixels in
source bitmaps. The destination is preserved now when encountering such
  transparent pixels in the source bitmaps.
* B_OP_ERASE is supposed to replace with the low color whereever a source
  bitmap has a non-transparent pixel.
* The B_OP_MIN and B_OP_MAX drawing modes are supposed to select either the
  source or destination pixel based on their brightness, not combine the two
  pixels' color components into a new pixel. The brightness_for() function is
  taken from ColorConversion.cpp in the interface kit. Probably a simpler
  algorithm would do as well.
* Handle B_TRANSPARENT_MAGIC_* in all cases when drawing bitmaps with non-alpha
  source bitmaps, as all modes except B_OP_COPY are sensitive to transparency.

This should make all drawing modes behave as documented in the BeBook. Except
for B_OP_SELECT, which seems broken under R5, the results compare nicely now.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26075 a95241bf-73f2-0310-859d-f6bbb57e9c96
2008-06-22 02:34:15 +00:00
..
2008-06-05 21:17:19 +00:00
2008-05-31 11:26:06 +00:00