L_CombineBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_CombineBitmap(pBitmapDst, nXDst, nYDst, nWidth, nHeight, pBitmapSrc, nXSrc, nYSrc, uFlags)

pBITMAPHANDLE pBitmapDst;	/* pointer to the destination bitmap handle */
L_INT nXDst;	/* x coordinate of the origin of the destination rectangle */
L_INT nYDst;	/* y coordinate of the origin of the destination rectangle */
L_INT nWidth;	/* width of the rectangle, measured in pixels */
L_INT nHeight;	/* height of the rectangle, measured in pixels */
pBITMAPHANDLE pBitmapSrc;	/* pointer to the source bitmap handle */
L_INT nXSrc;	/* x coordinate of the origin of the source rectangle */
L_INT nYSrc;	/* y coordinate of the origin of the source rectangle */
L_UINT32 uFlags;	/* operation flags */

Combines image data from two bitmaps, letting you specify the areas to be combined and the operations to be performed when combining the data.

Parameter	Description
pBitmapDst	Pointer to the bitmap handle referencing the destination bitmap. This is the bitmap that the function updates.
nXDst	The X coordinate of the origin of the destination rectangle.
nYDst	The Y coordinate of the origin of the destination rectangle.
nWidth	The width of the rectangle, measured in pixels. The same number is used for both source and destination rectangles.
nHeight	The height of the rectangle, measured in pixels. The same number is used for both source and destination rectangles.
pBitmapSrc	Pointer to the bitmap handle referencing the source bitmap, which is combined with the destination bitmap.
nXSrc	The X coordinate of the origin of the source rectangle.
nYSrc	The Y coordinate of the origin of the source rectangle.
uFlags	The flags are combined into four groups that define treatment of the source, treatment of the destination, the operation to use when combining the data, and the treatment of the resulting image. The flags apply only to the defined rectangles (not necessarily the whole bitmap). You can use a bitwise OR ( \| ) to specify one flag from each group. Refer to Flags for the L_CombineBitmap Function for the list of flags.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

For example, suppose you use the L_SpatialFilterBitmap function to apply an edge detection filter. You can then use this function to combine the resulting bitmap with the original one to produce an image with hard edges.

This function combines the data byte-by-byte. Both images must have the same color resolution. Images that are 24-bits per pixel are the easiest to combine. For other color resolutions, you must ensure that the pixel and byte boundaries are aligned on the rectangle borders. Both images must use the same palette, if a palette is required.

This function uses Windows-style coordinates (with a top-left origin) to specify the areas to be combined.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

If a region is defined for either the source or destination bitmap, or both bitmaps, the combine applies only to the intersection of regions.

Required DLLs and Libraries

LTKRN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Windows 95 / 98 / Me, Windows 2000 / XP, Windows CE.

See Also

Functions:	L_UnderlayBitmap, L_SkeletonBitmap, L_CorrelationBitmap, L_TextureAlphaBlendBitmap, L_ApplyTransformationParameters, L_GetMarksCenterMassBitmap, L_GetTransformationParameters, L_IsRegMarkBitmap, L_SearchRegMarksBitmap, L_BricksTextureBitmap, L_CanvasBitmap, L_DisplaceMapBitmap, L_VignetteBitmap, L_FragmentBitmap, L_HighPassFilterBitmap, L_UnsharpMaskBitmap, L_DiffuseGlowBitmap, L_MaskConvolutionBitmap
Topics:	Raster Image Functions: Copying Images
	Processing an Image
	Removing Noise
	Detecting and Enhancing Edges and Lines
	Implementing Transparency
	Raster Image Functions: Document Imaging
	Detecting Registration Marks
	Raster Image Functions: Detecting and Enhancing Edges and Lines
	Raster Image Functions: Processing an Image

Example

For complete sample code, refer to the CHILD.C module of the DEMO example.

/* This example uses the flags for a simple paste when combining
the source bitmap with the destination bitmap. */
BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image */
BITMAPHANDLE TmpBitmap; /* Temporary bitmap */
L_INT XDst;  /* Column offset of the destination */
L_INT XSize; /* Pixel width of the rectangle to combine */
L_INT YDst;  /* Row offset of the destination */
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 */
/* Load both bitmaps, at 24 bits per pixel */
L_LoadBitmap (TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);
L_LoadBitmap (TEXT("ULAY4.BMP"), &TmpBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);
/* Specify a position in the top left part of the displayed image */
XDst = BITMAPWIDTH(&LeadBitmap) / 8;
YDst = BITMAPHEIGHT(&LeadBitmap) / 8;
/* Use the full size of the source bitmap */
YSize = BITMAPHEIGHT(&TmpBitmap);
XSize = BITMAPWIDTH(&TmpBitmap);
XSrc = 0;
YSrc = 0;
/* Combine TmpBitmap with LeadBitmap, using flags for an ordinary paste */
L_CombineBitmap(&LeadBitmap, XDst, YDst, XSize, YSize,
                &TmpBitmap, XSrc, YSrc, CB_OP_ADD | CB_DST_0);
/* Free the temporary bitmap */
L_FreeBitmap (&TmpBitmap);