TTprintPreview and picture transparency

yannick · Member Joined: 20 May 2006 Posts: 6

Hello,

I am using TPP and all works very fine.

I have only one problem :

i want to use a TImage with transparency,

But when i use the PaintGraphicEx Method, the transparency doen't work

what is the problem ?

Best regards

Kambiz · Posted: 20/05/06 16:28 Post subject:

I'm sorry, but that method doesn't support transparency.

You have to calculate the target rectangle of the image, and draw it using the Canvas.StretchDraw method.

yannick · Member Joined: 20 May 2006 Posts: 6

Thank you for your very fast response...

do you plan to implement this in future versions ?

thank you

Yannick

//Edit #1

There is a PaintGraphicEx and PaintGraphicEx2 ....

so maybe a PaintGraphicEx3 in next versions ?

//Edit #2

Hello

I have try your method ; the picture appear good for bmp with transparency, but in the print there is nothing.

If i put a gif with transprency into, it fill the transparency zone with black....

so it doesnt solve my problem.

Do you know why ?

Thank you

Kambiz · Posted: 20/05/06 22:55 Post subject:

Some printer drivers can print only DIB bitmaps.

yannick · Member Joined: 20 May 2006 Posts: 6

So what is the solution to print a picture with transparency ?

i am not a specialist like you in this domain, i am not use to manipulate bitmap and all sort of draw methods,

so , do you plan to add this in your component ? i think it will be very usefull for including picture like logos on a grayscaled background....

or can you give me few lines to do it ?

thank you !

yannick

Kambiz · Posted: 21/05/06 11:54 Post subject:

Currently I'm too busy with my other stuffs. But for sure I'll remove this limitation in the next release.

yannick · Member Joined: 20 May 2006 Posts: 6

thank you very much !!!!

yannick · Member Joined: 20 May 2006 Posts: 6

Hello Kambiz

when will you take care of transparents picture in your component ?

best regards

Yannick

Kambiz · Posted: 11/09/06 22:35 Post subject:

Yannick,

I really don't know. It's a long time that I couldn't find time to spend on my hobbies. Sad

yannick · Member Joined: 20 May 2006 Posts: 6

hello kambiz !!!

do you plan to add gif transparency in tprintpreview ?

thank you

yannick

Johnny_Bit · Administrator Joined: 15 Jun 2003 Posts: 347

Dude, easy on this. Really, there's no way of Kambiz doing it in no-time, also there are no contributors, because it's Kambiz-only project and he is just a human that needs to work. Currently his work makes it hard for him to find time for DA, so let's not make things worse, OK?

Oh, Kambiz, why don't you change licence for components to LGPL v2? Then set-up some Subversion, get them on this rig, then it would be possible for many people contribute to the project and make things sweet.

Kambiz · Posted: 02/02/07 20:37 Post subject:

Dear yannick,

I've added image transparency support to the new version of PrintPreview. However, because some printers (drivers) does not support raster operations except SrcCopy, Blackness, and whiteness, it's disabled as default. To enabled it, open Preview.pas and define IMAGE_TRANSPARENCY directive.

Cheers