L_PerspectiveBitmap
#include "l_bitmap.h"
L_LTIMGSFX_API L_INT L_PerspectiveBitmap(pBitmap, pPoints, crBkgColor, uFlags)
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pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
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POINT * pPoints; |
/* pointer to an array of points */ |
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COLORREF crBkgColor; |
/* background color */ |
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L_UINT uFlags; |
/* flag */ |
Gives a bitmap a 3-D effect, as if it exists on a flat plane and has been skewed into a different shape.
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Parameter |
Description |
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pBitmap |
Pointer to the bitmap handle referencing the bitmap to be changed. |
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pPoints |
Pointer to an array of points that determine the new locations of image corners. It should contain four points; points at indices 0, 1, 2 and 3 determine the new locations of left-top, right-top, left-bottom and right-bottom image corners respectively. |
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crBkgColor |
Background color. |
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uFlags |
Flag that indicates how to create the background. Possible values are: |
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Value |
Meaning |
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PERSPECTIVE_IMAGE |
[0x0001] Use the same image as the background. |
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PERSPECTIVE_COLOR |
[0x0002] Fill the back ground with crBkgColor. |
Returns
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SUCCESS |
The function was successful. |
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< 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 new locations for the image corners should keep the relative relation between corners. For example, the point at index 1 should be to the right of point at index 0 and above the point at index 3. Also, the point at index 2 should be to the left of the point at index 3 and below the point at index 0 and so on. All new locations should remain inside the image.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
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 only in the Document/Medical toolkits.
If the bitmap has a region, this function works only on the region. If the bitmap does not have a region, this function works on the entire bitmap.
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
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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
Windows 2000 / XP/Vista.
See Also
Example
The following example loads a bitmap, and applies the 3D perspective effect
L_INT PerspectiveBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap;
POINT pNewLocations [4];
/* Load the bitmap, keeping the bits per pixel of the file */
nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Sample1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
pNewLocations [0].x=LeadBitmap.Width*3/9;
pNewLocations [0].y=LeadBitmap.Height*1/12;
pNewLocations [1].x=LeadBitmap.Width*3/4;
pNewLocations [1].y=LeadBitmap.Height*2/12;
pNewLocations [2].x=LeadBitmap.Width*2/10;
pNewLocations [2].y=LeadBitmap.Height*8/10;
pNewLocations [3].x=LeadBitmap.Width*10/11;
pNewLocations [3].y=LeadBitmap.Height*7/10;
/*Apply the filter*/
nRet = L_PerspectiveBitmap(&LeadBitmap, pNewLocations,RGB(255,255,255), PERSPECTIVE_IMAGE);
if(nRet !=SUCCESS)
return nRet;
nRet = L_SaveBitmap(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Result.BMP"), &LeadBitmap, FILE_BMP, 24, 0, NULL);
if(nRet !=SUCCESS)
return nRet;
//free bitmap
if(LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}