L_CanvasBitmap

#include "l_bitmap.h"

L_LTIMGSFX_API L_INT L_CanvasBitmap(pBitmap, pThumbBitmap, uTransparency, uEmboss, nXOffset, nYOffset, uTilesOffset, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
pBITMAPHANDLE pThumbBitmap;	/* pointer to the bitmap handle */
L_UINT uTransparency;	/* the transparency amount */
L_UINT uEmboss;	/* image intensity */
L_INT nXOffset;	/* the x distance */
L_INT nYOffset;	/* the y distance */
L_UINT uTilesOffset;	/* the amount of shifting */
L_UINT uFlags;	/* flags */

Combines two bitmaps, superimposing one bitmap on another bitmap that is used like a canvas.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap that will be applied to the canvas bitmap.
pThumbBitmap	Pointer to the bitmap handle that references the canvas bitmap.
uTransparency	The transparency amount between the image and the canvas. Valid range is from 0 to 100. When set to 0, only the canvas image displays, and when set to 100, the canvas image is barely visible.
uEmboss	Apparent depth of the canvas image. Valid range is from 0 to 200. When uTransparency is at 100, and uEmboss is 0 only the image displays. Increasing uEmboss increases the apparent depth of the canvas image.
nXOffset	The X distance between the canvas origin point and the image origin point (in pixels). Valid range is from Canvas bitmap width to +Canvas bitmap width.
nYOffset	The Y distance between the canvas origin point and the image origin point (in pixels). Valid range is from Canvas bitmap height to +Canvas bitmap height.
uTilesOffset	The amount to shift every row of canvas image from the origin. This parameter is not used when uFlags is set to CANVAS_FIT.
uFlags	Flags that identifiy how to distribute the canvas image with respect to the image and how to handle resizing. The following flags identify how the distribute the canvas image with respect to the image:
	Value	Meaning
	CANVAS_FIT	[0x0000] Fit the canvas image so it has the same dimensions as the bitmap that is being applied to the canvas, without tiling.
	CANVAS_SHIFT	[0x0010] Shift the canvas image by the amount specified in uTilesOffset.
	The following flags identify which resizing method to use to resize the canvas image in order to fit the original image:
	Value	Meaning
	SIZE_NORMAL	[0x0000] Resize normally.
	SIZE_RESAMPLE	[0x0002] Use linear interpolation and averaging to produce a higher quality image.
	SIZE_BICUBIC	[0x0004] Use bicubic interpolation and averaging to produce a higher quality image. This is slower than SIZE_RESAMPLE.

Returns

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

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

The L_CanvasBitmap function combines two bitmaps, superimposing one bitmap on another bitmap that is used like a canvas.

For an example, click here

Other functions that allow you to combine images include:

L_BumpMapBitmap

L_CombineBitmap

L_CombineBitmapWarp

L_TextureAlphaBlendBitmap

L_UnderlayBitmap

For more information on this and other functions that can be used to combine bitmaps, refer to Processing an Image.

This function supports 12- and 16-bit grayscale and 48- and 64-bit color images. Support for 12- and 16-bit grayscale and 48- and 64-bit color images is available in the Document and Medical Imaging toolkits.

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

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGSFX

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

Win32, x64.

See Also

Functions:	L_EmbossBitmap, L_AddShadowBitmap, L_AllocFTArray, L_BumpMapBitmap, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_CombineBitmap, L_CombineBitmapWarp, L_DFTBitmap, L_DirectionEdgeStatisticalBitmap, L_FFTBitmap, L_FreeFTArray, L_FrqFilterBitmap, L_FrqFilterMaskBitmap, L_FTDisplayBitmap, L_GetBitmapStatisticsInfo, L_GetFeretsDiameter, L_GetObjectInfo, L_GetRgnContourPoints, L_GetRgnPerimeterLength, L_MathFunctionBitmap, L_SegmentBitmap, L_SubtractBackgroundBitmap, L_TextureAlphaBlendBitmap, L_UnderlayBitmap, L_UserFilterBitmap, L_SizeBitmapInterpolate
Topics:	Raster Image Functions: Combining Images
	Raster Image Functions: Artistic Effects
	Applying Artistic Effects
	Processing an Image
	Raster Image Functions: Processing an Image

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


 L_INT CanvasBitmapExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
   BITMAPHANDLE CanvasBitmap; /*Bitmap handle for the canvas image */
   /* Load a bitmap at its own bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof (BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   /* Load a bitmap at its own bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ULAY1.bmp")), &CanvasBitmap, sizeof (BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   /* Apply the Canvas bitmap effect to the image*/
   nRet = L_CanvasBitmap(&LeadBitmap, &CanvasBitmap, 100, 100, 0, 0, 10, CANVAS_SHIFT);
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   //free bitmap 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);
   if(CanvasBitmap.Flags.Allocated)
      L_FreeBitmap(&CanvasBitmap);
   return SUCCESS;
}