L_HighQualityRotateBitmap

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT EXT_FUNCTION L_HighQualityRotateBitmap(pBitmap, nAngle, uFlags, crFill)

Rotates 1-bit (bitonal) images with high quality.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap to rotate.

L_INT nAngle

Hundredths of degrees to rotate (+/-). This can be a number from 0 to 36,000. Positive values rotate the image in a clockwise direction, while negative values rotate the image in a counter-clockwise direction.

L_UINT uFlags

Flag that specifies whether to keep the resulting image the same size as the original image or to resize according to the rotation direction specified. Possible values are:

Value Meaning
ROTATE_RESIZE [0x0001] Size the resulting image.
HIGHQUALITYROTATE_HIGH [0x0000] Rotate the image with high quality.(this is faster than best quality)
HIGHQUALITYROTATE_BEST [0x0010] Rotate the image the image with the best quality.
HIGHQUALITYROTATE_CROP [0x0000] Do not resize the image. Crop it.
HIGHQUALITYROTATE_RESIZE [0x0001] Use high quality resize.

L_COLORREF crFill

A COLORREF value representing the color of the backgrounds. You can specify the value, such as the return value of the Windows RGB macro, or use the PALETTEINDEX macro to specify a palette color.

Returns

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

Comments

This function has the following features:

If ROTATE_RESIZE is set, then the image is resized. Otherwise, the image is cropped.

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

Required DLLs and Libraries

Platforms

Win32, x64, Linux.

See Also

Functions

Topics

Example

L_INT HighQualityRotateBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("OCR1.TIF")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet = L_HighQualityRotateBitmap(&LeadBitmap, 2500,HIGHQUALITYROTATE_RESIZE | HIGHQUALITYROTATE_HIGH,RGB(255,255,255)); 
   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);   
   return SUCCESS; 
} 
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