General Discussion - How i can render PNG image

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How i can render PNG image

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Category: Codejock Products
Forum Name: General Discussion
Forum Description: Topics Related to Visual C++ MFC Development in General
URL: http://forum.codejock.com/forum_posts.asp?TID=7402
Printed Date: 30 January 2025 at 6:43pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: How i can render PNG image

Posted By: shobits1
Subject: How i can render PNG image
Date Posted: 18 June 2007 at 10:51pm

I wonder if any body can help to use codejock for loading and rendering PNG images from ressource and from external file.

I try diffrent function from codejock but no help,,

I excepet to show me the best why to draw a PNG image (storred
internally in my exe, or storred in extern dll file), and where i must store my PNG image( where in the ressource under "PNG" or under "Bitmap" Group).

sorry for my bad english,,, and thanks

Replies:

Posted By: Oleg
Date Posted: 19 June 2007 at 1:26am

Hello,

Try this

CXTPGraphicBitmapPng bitmap;

bitmap.LoadFromResource(hModule, hRes);

or load bitmaps/draw using CXTPImageManager collection

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: shobits1
Date Posted: 19 June 2007 at 11:28pm

Thank's "oleg"...

I will try with CXTPGraphicBitmapPng.

An other question: where my PNG image suppos to be in my resource file, I mean like icons it must be under ICON group & bitmap image must be under BITAMP group in my resource and so on (where PNG image must be). I try to set it under PNG group but it doesn't wok.

thank's for your help...

Posted By: Oleg
Date Posted: 20 June 2007 at 1:25am

Yes, you need PNG group.

check Samples\CommandBars\ActionsSample sample. It uses png for toolbar icons:

IDR_MAINFRAME PNG MOVEABLE PURE "res\\Toolbar.png"

Here part of code from sources:

hModule = AfxFindResourceHandle(lpszResource, _T("PNG"));

BOOL bPngBitmap = IsPngBitmapResource(hModule, lpszResource);
if (bPngBitmap)
{
CXTPGraphicBitmapPng bmpIcons;

HRSRC hResource = ::FindResource(hModule, lpszResource, _T("PNG"));

if (!bmpIcons.LoadFromResource(hModule, hResource))
return NULL;

  if (lbAlphaBitmap)
  {
   *lbAlphaBitmap = bmpIcons.IsAlpha();
  }

return (HBITMAP)bmpIcons.Detach();
}

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: shobits1
Date Posted: 20 June 2007 at 8:00pm

Thank's again oleg...

I have used this code and it works for load PNG image from file or from resource

---- Load PNG from local file

BOOL bAlpha=0;

HBITMAP hb = CXTPImageManagerIcon::LoadBitmapFromFile (pszFilePng, &bAlpha);

---- Load PNG from resource

BOOL bAlpha = FALSE;

hb = CXTPImageManagerIcon::LoadBitmapFromResource(_T("IDB_PNG_IMAGE"),&bAlpha );

LPCTSTR lpszResource = MAKEINTRESOURCE(IDB_PNG_IMAGE);

HMODULE hModule = AfxFindResourceHandle( lpszResource, _T("PNG") );

BOOL bPngBitmap = CXTPImageManagerIcon::IsPngBitmapResource(hModule, lpszResource);

if (bPngBitmap)

{

CXTPGraphicBitmapPng bmpIcons;

HRSRC hResource = ::FindResource(hModule, lpszResource, _T("PNG"));

if (!bmpIcons.LoadFromResource(hModule, hResource))

TRACE0("Can't Load");

BOOL lbAlphaBitmap = bmpIcons.IsAlpha();

hb = (HBITMAP)bmpIcons.Detach();

}

Thanks to oleg

---- Also I found a post and I verified it and it work,, thanks to http://forum.codejock.com/member_profile.asp?PF=1322&FID=18 - danpetitt

http://forum.codejock.com/forum_posts.asp?TID=5840 - http://forum.codejock.com/forum_posts.asp?TID=5840

The Problem is the look of my render; it doesn't draw the transparency in the right way

This my PNG render.

This windows XP Picture and Fax preview render

n I used to render my image this code

void CChildView::OnPaint()

{

CPaintDC pdc(this); // device context for painting

CXTMemDC dc(&pdc, CRect(0,0,0,0)); // I used this to reduce filcker

CXTPImageManagerIcon::DrawAlphaBitmap(&dc, hb, CPoint(50,50), CSize(256,256), 0, CSize(256,256) );

}

Posted By: Oleg
Date Posted: 21 June 2007 at 1:26am

Hi,

Attach project with all bitmaps/png here or in issue track.

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: shobits1
Date Posted: 21 June 2007 at 11:36am

Hi oleg ....

since I can't upload my project, I have created a simple one that demonstrate the problem

this is the link

http://forum.codejock.com/uploads/20070621_113016_Draw_PNG.rar - uploads/20070621_113016_Draw_PNG.rar

the project was create with VS2005

the file "ChildView.cpp" have my routine to load and draw the PNG image.

you can check my code, and I hope to figureout where I am wrong...

Thank's to you for help.

Posted By: Oleg
Date Posted: 21 June 2007 at 3:03pm

Right. You also need premultiply bitmap if it has alpha layer:

RSRC hResource = ::FindResource(hModule, lpszResource, _T("PNG"));

CXTPGraphicBitmapPng mBitmapPng;

if (!mBitmapPng.LoadFromResource(hModule, hResource))

TRACE0("\nCan't Load PNG from resource\n");

mBitmap.Attach(CXTPImageManagerIcon::PreMultiplyAlphaBitmap(mBitmapPng));

CXTPImageManagerIcon::DrawAlphaBitmap( &dc, mBitmap, CPoint(50,50), CSize(256,256), 0, CSize(256,256) );

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: shobits1
Date Posted: 21 June 2007 at 3:31pm

Thank's oleg ....

I try it and it work...