LBitmap::Perspective

#include "ltwrappr.h"

L_INT LBitmap::Perspective(pPoints, crBkgColor, uFlags)

POINT * pPoints;	/* pointer to an array of points */
COLORREF crBkgColor;	/* background color */
L_UINT uFlags;	/* flag */

Gives a bitmap a 3-D effect, as if it exists on a flat plane and has been skewed into a different shape.

Parameter	Description
pPoints	Pointer to an array of points that determine the new locations of image corners. It should contain four points; points at indices 0, 1, 2 and 3 determine the new locations of left-top, right-top, left-bottom and right-bottom image corners respectively.
crBkgColor	Background color.
uFlags	Flag that indicates how to create the background. Possible values are:
	Value	Meaning
	PERSPECTIVE_IMAGE	[0x0001] Use the same image as the background.
	PERSPECTIVE_COLOR	[0x0002] Fill the back ground with crBkgColor.

Returns

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

Comments

The new locations for the image corners should keep the relative relation between corners. For example, the point at index 1 should be to the right of point at index 0 and above the point at index 3. Also, the point at index 2 should be to the left of the point at index 3 and below the point at index 0 and so on. All new locations should remain inside the image.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

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 only in the Document/Medical toolkits.

If the bitmap has a region, this function works only on the region. If the bitmap does not have a region, this function works on the entire bitmap.

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 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

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.

See Also

Functions:	LBitmap::AddNoise, LBitmap::Emboss, LBitmap::Mosaic, LBitmap::MotionBlur, LBitmap::Oilify, LBitmap::Posterize, LBitmap::RemoveRedeye, LBitmap::Solarize, LBitmapBase::Underlay, LBitmap::Bending, LBitmap::Cylindrical, LBitmap::FreeHandShear, LBitmap::FreeHandWave, LBitmap::Pixelate, LBitmap::Impressionist, LBitmap::Polar, LBitmap::Punch, LBitmap::RadialBlur, LBitmap::RadWave, LBitmap::Ripple, LBitmap::Swirl, LBitmap::Wave, LBitmap::Wind, LBitmap::ZoomBlur, LBitmap::ZoomWave, LBitmap::BumpMap, LBitmap::Cubism, LBitmap::DrawStar, LBitmap::Dry, LBitmap::FreePlaneBend, LBitmap::FreeRadBend, LBitmap::GlassEffect, LBitmap::GlowFilter, LBitmap::LensFlare, LBitmap::Light, LBitmap::Ocean, LBitmap::PlaneBend, LBitmap::Plane, LBitmap::SampleTarget, LBitmap::Tunnel, LBitmap::Spherize
Topics:	Raster Image Functions: Doing Geometric Transformations
	Processing an Image
	Applying Artistic Effects
	Raster Image Functions: Filtering Images
	Raster Image Functions: Processing an Image
	Raster Image Functions: Functions Where the Region Preempts the Bitmap
	Raster Image Functions: Artistic Effects

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LBitmap__PerspectiveExample(LBitmapWindow m_LBitmapWnd)
{
   L_INT nRet;
   POINT pNewLocations [4];
   pNewLocations [0].x=m_LBitmapWnd.GetWidth()*3/9;
   pNewLocations [0].y=m_LBitmapWnd.GetHeight()*1/12;
   pNewLocations [1].x=m_LBitmapWnd.GetWidth()*3/4;
   pNewLocations [1].y=m_LBitmapWnd.GetHeight()*2/12;
   pNewLocations [2].x=m_LBitmapWnd.GetWidth()*2/10;
   pNewLocations [2].y=m_LBitmapWnd.GetHeight()*8/10;
   pNewLocations [3].x=m_LBitmapWnd.GetWidth()*10/11;
   pNewLocations [3].y=m_LBitmapWnd.GetHeight()*7/10;
   LBitmap LeadBitmap;
   nRet =LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), 0,ORDER_BGR);
   if(nRet !=SUCCESS)
      return nRet;
   nRet =LeadBitmap.Perspective(pNewLocations,RGB(255,255,255), PERSPECTIVE_IMAGE);
   if(nRet !=SUCCESS)
      return nRet;
   return SUCCESS;
}