#include "l_bitmap.h"

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


pointer to the bitmap handle

L_INT nAngle;

rotation degrees

L_UINT uFlags;

rotation behavior


background fill color

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

Parameter Description
pBitmap Pointer to the bitmap handle that references the bitmap to rotate.
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.
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.
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.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


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


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


Win32, x64, Linux.

See Also


L_RotateBitmap, L_DeskewBitmap


Raster Image Functions: Doing Geometric Transformations


Raster Image Functions: Functions That Transform the Region and the Bitmap


Raster Image Functions: Processing an Image


Cleaning Up 1-Bit Images


Resizing Considerations


Detecting Registration Marks


Using Color Values in LEADTOOLS


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  
   return SUCCESS; 
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