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L_SetSaveResolution

#include "l_bitmap.h"

L_LTFIL_API L_INT L_SetSaveResolution(uCount, pResolutions)

Sets resolutions for the next save operation.

Parameters

L_UINT uCount

Specifies the number of resolutions to be saved in a file. Or, specify 0 to save only the actual size of the image as a single dimension in the file.

pDIMENSION pResolutions

Pointer to the array of DIMENSION structures which hold the resolutions to be saved.

Returns

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

Comments

Currently, this function only works with the JBIG format.

A JBIG, FlashPix or PhotoCD file can contain more than one copy of the same image, each at a different physical resolution (width and height in pixels).

For JBIG files, uCount refers to the number of resolution layers to be saved in the file. The maximum number of resolutions that can be saved is 29.

For a JBIG file, the values of different resolutions are implied because the dimensions of each resolution layer are half the dimensions of the one directly above it.

pResolutions[0] is used to determine the highest resolution layer which will be saved in a file. You can fill pResolutions[0] with an actual width and height, or you can fill either the width or height with a valid value, and specify 0 for the other dimension to allow LEADTOOLS to calculate that dimension based on the image's aspect ratio during the next save operation. Note that for JBIG, all the values set in pResolutions are stored, but only pResolutions[0] is used during an actual file save process.

Ex.

uCount = 3
pResolution[0].nWidth = 800
pResolution[0].nHeight = 0

If you then save an image that is 1600 x 1200, the resolutions that are stored in the file would be:

800 x 600
400 x 300
200 x 150

Required DLLs and Libraries

LTFIL
File format DLLs
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, Linux.

Functions

Topics

Example

This example saves the same image in three different resolutions and in three different files.

L_INT SetSaveResolutionExample(L_TCHAR     * pszFilename,pBITMAPHANDLE pLeadBitmap) 
{ 
   L_INT nRet; 
   DIMENSION Resolutions; /* Dimension structure */ 
   L_TCHAR szName[256];   /* File Name sting     */ 
   
   /* Default case,save only one resolution layer. */ 
   nRet = L_SetSaveResolution (0, &Resolutions); 
   if(nRet != SUCCESS) 
      return nRet; 
   wsprintf(szName, TEXT("%s_1"),pszFilename); 
   nRet = L_SaveBitmap(szName,pLeadBitmap,FILE_JBIG,1,0, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Save 2 resolution layers,the highest resolution layer holds the image at full dimensions because 
      Resolutions.nWidth is equal to the FULL WIDTH of the original image */ 
   Resolutions.nWidth= BITMAPWIDTH(pLeadBitmap); 
   Resolutions.nHeight=0; 
   wsprintf(szName, TEXT("%s_2"),pszFilename); 
   nRet = L_SetSaveResolution (2, &Resolutions); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_SaveBitmap(szName,pLeadBitmap,FILE_JBIG,1,0, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Save 3  resolution layers,the highest resolution layer holds the image at half 
      the full image dimensions becuase Resolutions.nHeight is equal to HALF THE FULL HEIGHT of the original image. */ 
   Resolutions.nWidth= 0; 
   Resolutions.nHeight=BITMAPHEIGHT(pLeadBitmap)/2; 
   wsprintf(szName, TEXT("%s_3"),pszFilename); 
   nRet = L_SetSaveResolution (3, &Resolutions); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_SaveBitmap(szName,pLeadBitmap,FILE_JBIG,1,0, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}

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