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L_GlassEffectBitmap

Summary

Divides the bitmap into rectangular cells and makes it look as if it is being viewed through glass blocks.

Syntax

#include "l_bitmap.h"

L_LTIMGSFX_API L_INT L_GlassEffectBitmap(pBitmap, uCellWidth, uCellHeight, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap to be changed.

L_UINT uCellWidth

Value that represents the width of a cell in pixels or the number of cells present across the width of the bitmap, based on the flags set in uFlags. The valid range is between 2 and half the bitmap width.

L_UINT uCellHeight

Value that represents the height of a cell in pixels or the number of cells present across the height of the bitmap, based on the flags set in uFlags. The valid range is between 2 and half the bitmap height.

L_UINT uFlags

Flags that indicate what type of data is in the uCellWidth and uCellHeight parameters. You can use a bitwise OR ( | ) to specify one flag from each group.

The following are the flags that indicate the type of data in the uCellWidth parameter:

Value	Meaning
GLASS_WFRQ	[0x0001] The parameter uCellWidth is the number of cells along the width of the bitmap.
GLASS_WPER	[0x0002] The parameter uCellWidth is the width of the cell in pixels.

The following are the flags that indicate the type of data in the uCellHeight parameter:

Value	Meaning
GLASS_HFRQ	[0x0010] The parameter `uCellHeight` is the number of cells along the height of the bitmap.
GLASS_HPER	[0x0020] The parameter `uCellWidth` is the height of the cell in pixels.

Returns

Value	Meaning
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.

If the bitmap has a region, the effect will be applied on the region only.

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.

Glass Effect Function - Before

Glass Effect Function - After

View additional platform support for this Glass Effect 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.

Example

The following example loads a bitmap and applies a glass effect to it:

L_INT GlassEffectBitmapExample(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("Image1.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* apply glass effect */ 
   nRet = L_GlassEffectBitmap(&LeadBitmap, 20, 10, GLASS_WFRQ | GLASS_HPER); 
   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; 
}