Transparent bitmap on window

[byte-one]

I use a bitmap with a white pixel in 0,0. But when i use oBitmap:ltransparent := .T. all the white pixels are black and not transparent! Any solution?

[ukoenig]

Hello Günther,

have a look at my new post for a solution.

Create Alpha-Bl.-BMP with different Applications
---------------------------------------------------------
viewtopic.php?f=3&t=14508

Regards
Uwe

[James Bott]

I think bitmaps are transparent according to the first pixel without using lTransparent. Have you tried this?

Regards,
James

[ukoenig]

Hello James,

Günther said, he wants to use the BMP inside a WINDOW !!! .
The solution with a frame works inside a Object like a xBrowse-cell.
For a Window it is => ABPaint( hDC, 20, 20, oBmp:hBitmap, 220 ).
If he wants to use just a normal BMP, he has to convert it at first ( define transparent areas ).
I'm not shure, how and where he wants to use the Bitmap.

Regards
Uwe

[byte-one]

Ulli, only to paint a BMP on the main-window with a colored background. In the BMP there are a white region with a logo in blue. The left-top-pixel are also white. But no transparence are reachable.

[Antonio Linares]

Günther,

Are you using TransBmp() to paint the bitmap ?

i.e.:

Code: Select all  Expand view

            nOldClr = SetBkColor( ::hDC, nRGB( 255, 255, 255 ) )
            TransBmp( ::hBitmap, ::nWidth(), ::nHeight(), nZeroZeroClr, ::hDC,;
                      ::nX, ::nY, Super:nWidth(), Super:nHeight() )
            SetBkColor( ::hDC, nOldClr )


nZeroZeroClr is the color at pixel 0,0 of the bitmap

Search for TransBmp() in FWH\source\classes, there you will find some examples of use

[byte-one]

No, i use the standard "@ 5,5 BITMAP..... and oBitmap:ltransparent := .T. " and i see in source, that transbmp() is used in this class.
This is the picture to show:

[Antonio Linares]

Günther,

is it a MDI window or a non MDI window ?

[Antonio Linares]

Günther,

A working example:

[byte-one]

Antonio, thanks, i will try tomorrow. I see, that i use no the call refresh().
Can the clausula TRANSPARENT to better handling not include in the @ 5,5 BITMAP/IMAGE and in REDEFINE BITMAP/IMAGE?

[byte-one]

Antonio, its a normal window as in your example. But in the "@ 5,5 BITMAP" i MUST define "OF oWindow". If not, no picture is to see.
But all my tests come to same result. The picture is NOT transparent!?

[ukoenig]

Hello Günther,

Your Bitmap has no < ALPHACHANNEL > !!!
it was the same problem with Silvio's BMP. I solved his problem and it works.
I tested Your Logo with the same result.
I captured Your image and saved it as < PNG > !!!.
After that, replaced the background with transparent ( erase background ).
For that, You choose < TRANSPARENT > from the color-picker, after that You can use the FILL-Container.
The result of the TRANSPARENT-painting is shown in the preview-window as Black color.
The PNG-Image is saved as Alphablended BMP ( like the preview-/test-window with black background ).
You can use the result as SPLASH-Logo as well.

I used < IcoFX >

viewtopic.php?f=3&t=14484&p=75182#p75182

The problem with a background : it is not allways a clear color.



The result
The Transparent-background-painting is not finished ( some background-parts are still white ),
to show what I mean !!!!
-----------------------------


Regards
Uwe

[ukoenig]

download : http://www.pflegeplus.com/fw_downloads/volksbank.zip

Volksbank.png ( With completed transparent-background. Here You can still change something )
Volksbank.bmp ( Alpha-Blended-BMP )
Volksbank.jpg ( how to do it )



You can add a shadow


Creating a RED Shadow

Code: Select all  Expand view

...
...

DEFINE BITMAP oBmp1 FILENAME "Volksbank.bmp"

ACTIVATE WINDOW oWnd MAXIMIZED ;
ON PAINT ( gradpaint( hDC, oWnd ), ;
ABPaint( hDC, 50, 50, oBmp:hBitmap, 220 ) )

RETURN NIL

// -----------------------------------------------

STATIC FUNTION gradpaint( hDC, oWnd )

local aGrad := { { 0.50, 16054371, 11892819 } }

GradientFill( hDC,  0, 0, oWnd:nHeight, oWnd:nWidth, aGrad, .F. )

RETURN NIL



Regards
Uwe

[byte-one]

Uwe, thanks for your help. Its functioning perfect! But regardless the normal way to display transparent bitmaps on windows should be possible -> ANTONIO

[Antonio Linares]

Günther,

I posted a working example, maybe it was not working on your side as you use white for the windows background color (?)

You could try to change the background of your bitmap from white to another color and test my code again