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Bizarro
I post too much
 Reputation: 0
Joined: 01 May 2007
Posts: 2648
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 Posted: Tue Apr 29, 2008 12:49 pm Post subject: [c++] how to load png in dialog |
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i have sucessfully loaded a bmp in my c++ dialog. but the problem is that its background is white in contrast to my pure black dialog background. i was wondering if there is anyway to make the bmp background to transparent.
or if its possible to load a png instead ( which contains transparent background)
here is what i did to load the bmp, anyone know how i can do the same to png for transparent effect?
| Code: |
HBITMAP Pic = NULL;
Pic = LoadBitmap(GetModuleHandle("pcomdebug"),MAKEINTRESOURCE(IDB_BALL));
// load the pic from the resource bmp in IDB_BALL
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| Code: |
case WM_PAINT:
{
BITMAP bm;
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
HDC hdcMem = CreateCompatibleDC(hdc);
HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem, Pic);
GetObject(Pic, sizeof(bm), &bm);
BitBlt(hdc, 5, 40, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
// draw the bmp with specific size and coordinates
SelectObject(hdcMem, hbmOld);
DeleteDC(hdcMem);
EndPaint(hWnd, &ps);
}
break;
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tx for any help
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Last edited by Bizarro on Tue Apr 29, 2008 2:37 pm; edited 1 time in total |
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tombana
Master Cheater
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Joined: 14 Jun 2007
Posts: 456
Location: The Netherlands
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| Posted: Tue Apr 29, 2008 1:53 pm Post subject: |
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I don't know exactly but I think you have to create a mask image or something, and then change the following line:
BitBlt(hdc, 5, 40, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SRCCOPY should be something like SRCAND.
That's all I know
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Bizarro
I post too much
Reputation: 0
Joined: 01 May 2007
Posts: 2648
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| Posted: Tue Apr 29, 2008 2:03 pm Post subject: |
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its alright, my friend just helped me made a bmp with black background.
it fits perfectly 
but if anyone can show me a way to load png, it would be great
________
Machine
Last edited by Bizarro on Tue Feb 01, 2011 11:59 am; edited 1 time in total |
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hcavolsdsadgadsg
I'm a spammer
![]() Reputation: 26
Joined: 11 Jun 2007
Posts: 5801
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| Posted: Tue Apr 29, 2008 2:47 pm Post subject: |
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Why are you doing all that extra work on WM_PAINT over and over?
Load / create it once then just blit it form the offscreen buffer.
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atom0s
Moderator
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Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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