BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Strange behavior when using BitBlt + transparent          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message Ramy Guest Posted: Sun Feb 22, 2004 10:39 am    Post subject: Strange behavior when using BitBlt + transparent Hi, I have 2 images on form, Image1 and Image2 and i'm using BitBlt to copy piece from Image2 to Image1. When Image1 (the destination image) is NOT transparent then everything is OK, and after the copy i can see the piece from Image2 on Image1, but if i change Image1 to: Transparent = true then when i use the BitBlt to do the copy i can see image2 parts only on the Image1 parts which their color was not transparent color! all the parts in Image1 which where transparent stay as they are and i don't see Image2 pattern on them! I hope that you understood what i mean, why does it happen? By the way if at this point (after the copy) i change Image1 in runtime back to transparent = false then suddenly i see all Image2 piece on Image1 as it should be! Thanks, Ramy. Back to top Ronald Loonstra Guest Posted: Sun Feb 22, 2004 11:42 pm    Post subject: Re: Strange behavior when using BitBlt + transparent Ramy, Just a suggestion. In your previous post I saw you were referencing TImage->Canvas directly. Does it work when you use TImage->Picture->Bitmap->Canvas? Greetings, Ronald "Ramy" <No (AT) mail (DOT) dot.com> schreef in bericht news:403886ff$1 (AT) newsgroups (DOT) borland.com... Quote: Hi, I have 2 images on form, Image1 and Image2 and i'm using BitBlt to copy piece from Image2 to Image1. When Image1 (the destination image) is NOT transparent then everything is OK, and after the copy i can see the piece from Image2 on Image1, but if i change Image1 to: Transparent = true then when i use the BitBlt to do the copy i can see image2 parts only on the Image1 parts which their color was not transparent color! all the parts in Image1 which where transparent stay as they are and i don't see Image2 pattern on them! I hope that you understood what i mean, why does it happen? By the way if at this point (after the copy) i change Image1 in runtime back to transparent = false then suddenly i see all Image2 piece on Image1 as it should be! Thanks, Ramy. Back to top Ramy Guest Posted: Mon Feb 23, 2004 7:33 am    Post subject: Re: Strange behavior when using BitBlt + transparent Sorry but i already lost this code... sorry. "Ronald Loonstra" <r.loonstra (AT) home (DOT) nl> wrote: Quote: Ramy, Just a suggestion. In your previous post I saw you were referencing TImage->Canvas directly. Does it work when you use TImage->Picture->Bitmap->Canvas? Greetings, Ronald "Ramy" <No (AT) mail (DOT) dot.com> schreef in bericht news:403886ff$1 (AT) newsgroups (DOT) borland.com... Hi, I have 2 images on form, Image1 and Image2 and i'm using BitBlt to copy piece from Image2 to Image1. When Image1 (the destination image) is NOT transparent then everything is OK, and after the copy i can see the piece from Image2 on Image1, but if i change Image1 to: Transparent = true then when i use the BitBlt to do the copy i can see image2 parts only on the Image1 parts which their color was not transparent color! all the parts in Image1 which where transparent stay as they are and i don't see Image2 pattern on them! I hope that you understood what i mean, why does it happen? By the way if at this point (after the copy) i change Image1 in runtime back to transparent = false then suddenly i see all Image2 piece on Image1 as it should be! Thanks, Ramy. 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