On Mon, 13 Mar 2006 11:09:19 +0100
Tomas Gregorovic <[EMAIL PROTECTED]> wrote:
> Mattias Gaertner napsal(a):
>
> >On Fri, 10 Mar 2006 14:15:44 +0100
> >Tomas Gregorovic <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >>Hi,
> >>finally I have finished my long battle around bitmap masks.
> >>
> >>I have implemented method CreateBitmapMask, which creates mask according
> >
> >>to transparent color. The white pixels stand for opacity and black for
> >>transperency (I have found out that this is in contrary to Delphi). I
> >>hope this routine will function under all supported OSes - I have tested
> >
> >>it on win only.
> >>
> >>Next, I had to change btimap and image transparent* properties to behave
> >
> >>like Delphi equivalents.
> >>
> >>The difficult problem was how to keep transparency built in source of
> >>bitmaps such as *.xpm. This I have solved by creating new seperate mask
> >>accessible throught AlphaMaskHandle, which stores alpha channel data
> >>that were previously stored in MaskHandle object.
> >>
> >>I have attached small test project, which nicely illustrates right mask
> >>functioning.
> >>
> >>
> >
> >You added an AlphaMaskHandle, but I don't see when we need both
> >MaskHandle and AlphaMaskHandle.
> >Why not use the MaskHandle for the Mask?
> >
> >And btw: Not all widgetsets use separate Handle and MaskHandle.
> >
> >
> >Mattias
> >
> >
> Sorry, my fault. Now when I have better looked into code I see it.
> Therefore I have moved into using only MaskHandle and added flag
> FAlphaMasked, which says whether the MaskHandle is source bitmap alpha
> mask and then the transparent color is not used.
I took a closer look at the patch:
You rewrote TBitmap.InitFPImageReader to not use for the transparentcolor
the left, bottom pixel of the coming stream. Why?
Canvas.Pixels[0,Height-1] does not work under gtk, so
TBitmap.GetTransparentColor does not work this way.
And where do you actually create the alpha mask?
Mattias
_________________________________________________________________
To unsubscribe: mail [EMAIL PROTECTED] with
"unsubscribe" as the Subject
archives at http://www.lazarus.freepascal.org/mailarchives
