Author: mlytwyn
Date: Tue Mar 8 17:32:03 2016
New Revision: 39482
URL: http://svn.gna.org/viewcvs/gnustep?rev=39482&view=rev
Log:
Add comment regarding the windows bitmap processing
Modified:
libs/back/branches/gnustep_testplant_branch/Source/win32/WIN32Server.m
Modified: libs/back/branches/gnustep_testplant_branch/Source/win32/WIN32Server.m
URL:
http://svn.gna.org/viewcvs/gnustep/libs/back/branches/gnustep_testplant_branch/Source/win32/WIN32Server.m?rev=39482&r1=39481&r2=39482&view=diff
==============================================================================
--- libs/back/branches/gnustep_testplant_branch/Source/win32/WIN32Server.m
(original)
+++ libs/back/branches/gnustep_testplant_branch/Source/win32/WIN32Server.m
Tue Mar 8 17:32:03 2016
@@ -2931,6 +2931,17 @@
HBITMAP hOldAndMaskBitmap = (HBITMAP)SelectObject(hAndMaskDC,
hAndMaskBitmap);
HBITMAP hOldXorMaskBitmap = (HBITMAP)SelectObject(hXorMaskDC,
hXorMaskBitmap);
+ /* On windows, to calculate the color for a pixel, first an AND
is done
+ * with the background and the "and" bitmap, then an XOR with
the "xor"
+ * bitmap. This means that when the data in the "and" bitmap is
0, the
+ * pixel will get the color as specified in the "xor" bitmap.
+ * However, if the data in the "and" bitmap is 1, the result
will be the
+ * background XOR'ed with the value in the "xor" bitmap. In case
the "xor"
+ * data is completely black (0x000000) the pixel will become
transparent,
+ * in case it's white (0xffffff) the pixel will become the
inverse of the
+ * background color.
+ */
+
// Scan each pixel of the souce bitmap and create the masks
int y;
int *pixel = (int*)[rep bitmapData];
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