L_DisplaceMapBitmap - Raster Imaging C API Help

L_DisplaceMapBitmap

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_DisplaceMapBitmap(pBitmap, pDisplacementMap, uHorzFact, uVertFact, crFill, uFlags)

pBITMAPHANDLE pBitmap;

pointer to the bitmap handle

pBITMAPHANDLE pDisplacementMap;

pointer to the displacement bitmap handle

L_UINT uHorzFact;

horizontal shift factor

L_UINT uVertFact;

vertical shift factor

COLORREF crFill;

fill color

L_UINT uFlags;

flags

Displaces bitmap pixels horizontally and vertically according to the values of the displacement map image.

Parameter Description
pBitmap Pointer to the bitmap handle that references the bitmap on which to apply the effect.
pDisplacementMap Pointer to the bitmap handle that references the displacement map bitmap.
uHorzFact Horizontal displacement factor, in percent of the bitmap dimensions. The valid range is from 0 to 100.
uVertFact Vertical displacement factor, in percent of the bitmap dimensions. The valid range is from 0 to 100.
crFill The COLORREF value that specifies the fill color for any exposed areas. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.
uFlags Flags that indicate how to handle exposed areas, and the way to use the displacement map image. You can use a bitwise OR (|) to specify one flag from each group.

The following are the flags that indicate how to handle exposed areas:

  Value Meaning
  FILL_CLR [0x0000] Fill any exposed areas with crFill
  FILL_RPT [0x0001] Stretch the image edges to fill the exposed area.
  FILL_NOCHG [0x0002] Leave the exposed area as is, without changing it.
  FILL_WRAP [0x0003] Fill any exposed area with the opposite side of the image.
  The following are the flags that indicate the way to use the displacement map image:
  Value Meaning
  DSPL_STRETCH [0x0000] Stretch the displacement map image over the entire image area.
  DSPL_TILE [0x0010] Repeat the displacement map image to cover the image area.

Returns

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.

This effect shifts image pixels according to the values of the displacement map. Red values in the displacement map shift the original pixels horizontally. Green values in the displacement map shift the original values vertically. Blue values are ignored. A displacement map value of 128 means not to shift anything. A displacement map value of 0 means to shift pixels the complete vertical or horizontal percentage, to the left or down. A displacement map value of 255 means to shift pixels the complete vertical or horizontal percentage, to the right or up.

Displacement maps modify the geometry of the object. As a result, pixel shifts and forms may be added to the image, and the image may be warped or distorted.

For an example, click here

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.

Required DLLs and Libraries

LTIMGEFX

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.

See Also

Functions:

L_AddBitmapNoise, L_EmbossBitmap, L_MosaicBitmap, L_MotionBlurBitmap, L_OilifyBitmap, L_PosterizeBitmap, L_RemoveRedeyeBitmap, L_SolarizeBitmap, L_UnderlayBitmap, L_BendingBitmap, L_CylindricalBitmap, L_FreeHandShearBitmap, L_FreeHandWaveBitmap, L_PixelateBitmap, L_ImpressionistBitmap, L_PolarBitmap, L_PunchBitmap, L_RadialBlurBitmap, L_RadWaveBitmap, L_RippleBitmap, L_SpherizeBitmap, L_SwirlBitmap, L_WindBitmap, L_ZoomBlurBitmap, L_ZoomWaveBitmap, L_BumpMapBitmap, L_CubismBitmap, L_DrawStarBitmap, L_DryBitmap, L_FreePlaneBendBitmap, L_FreeRadBendBitmap, L_GlassEffectBitmap, L_GlowFilterBitmap, L_LensFlareBitmap, L_LightBitmap, L_OceanBitmap, L_PlaneBendBitmap, L_PlaneBitmap, L_SampleTargetBitmap, L_TunnelBitmap

Topics:

Raster Image Functions: Doing Geometric Transformations

 

Applying Artistic Effects

 

Processing an Image

 

Raster Image Functions: Processing an Image

Example

L_INT DisplaceMapBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
   BITMAPHANDLE DisplacementMap;   /* Bitmap handle for the displacement map */ 
   /* Load a bitmap at its own bits per pixel  */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("mageProcessingDemo\\Image2.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   /* Load a displacement map at its own bits per pixel  */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("mageProcessingDemo\\Image1.jpg")), &DisplacementMap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Shift the image according to the displacement map*/ 
   nRet = L_DisplaceMapBitmap(&LeadBitmap, &DisplacementMap, 5, 5, RGB(0,0,0), FILL_CLR|DSPL_TILE); 
   if(nRet !=SUCCESS) 
      return nRet; 
   if(DisplacementMap.Flags.Allocated) 
       L_FreeBitmap(&DisplacementMap); 
   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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