Combining Images with Regions

1.	Define the following global variables:

CWnd WndClient; /* current child window */   
RGNXFORM XForm; /* Structure for transforming display coordinates */   
RECT rClientArea; /* Client area of the current window */   
RECT rRgnRect; /* Rectangle that defines the region */   
LBitmapBase BitmapDst; /* Destination bitmap */   
LBitmapBase BitmapSrc; /* Source bitmap */   
L_INT XDst; /* Column offset of the destination */   
L_INT YDst; /* Row offset of the destination */   
L_INT XSize;/* Pixel width of the rectangle to combine */   
L_INT YSize;/* Pixel height of the rectangle to combine */   
L_INT XSrc; /* Column offset of the source */   
L_INT YSrc; /* Column offset of the source */

2.	Load two images as follows:

BitmapDst.Load(MAKE_IMAGE_PATH(TEXT("sample1.cmp")), 0, ORDER_BGR, NULL, NULL);   
BitmapSrc.Load(MAKE_IMAGE_PATH(TEXT("sample2.cmp")), 0, ORDER_BGR, NULL, NULL);

3.	Get the client area of the current child window as follows:

WndClient.GetClientRect(&rClientArea);

4.	Set RGNXFORM fields, assuming that the display rectangle is the same as the client area of the current child window as follows:

XForm.uViewPerspective = TOP_LEFT;   
XForm.nXScalarNum = BitmapDst.GetWidth();   
XForm.nXScalarDen = rClientArea.right;   
XForm.nYScalarNum = BitmapDst.GetHeight();   
XForm.nYScalarDen = rClientArea.bottom;   
XForm.nXOffset = 0;   
XForm.nYOffset = 0;

5.	Specify a rectangle to define the region and then create a rectangular region as follows:

SetRect(&rRgnRect, rClientArea.right/8, rClientArea.bottom/8, rClientArea.right/2, rClientArea.bottom/2);   
LBitmapRgn bmpRegion(&BitmapDst);   
bmpRegion.SetRgnRect(&rRgnRect);   
bmpRegion.SetRgnXForm(&XForm);

6.	Specify a position in the top left part of the displayed image and use the full size of the source bitmap as follows:

XDst = BitmapDst.GetWidth() / 8;   
YDst = BitmapDst.GetHeight() / 8;   
YSize = BitmapSrc.GetHeight();   
XSize = BitmapSrc.GetWidth();   
XSrc = 0;   
YSrc = 0;

7.	Combine BitmapDst with BitmapSrc, using flags for an ordinary paste, and save it as a new file:

BitmapDst.Combine(&BitmapSrc, XDst, YDst, XSize, YSize, XSrc, YSrc, CB_OP_ADD | CB_DST_0);   
BitmapDst.Save(MAKE_IMAGE_PATH(TEXT("eye.gif")), FILE_BMP, 0, 2, 1, 0);

8.	At the end you should free the rectangle:

bmpRegion.Free();

Help Version 19.0.2017.10.27

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