L_LensFlareBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_LensFlareBitmap(pBitmap, ptCenter, uBright, uFlag, crColor)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
POINT ptCenter;	/* effect center point */
L_UINT uBright;	/* brightness factor */
L_UINT uFlag;	/* flag */
COLORREF crColor;	/* color value */

Simulates the secondary reflections caused when bright lights are facing the camera lens. The lens flare is refracted into a series of lightened circles that surround the flare. This function is available in the Raster Pro and above toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap on which to apply the effect.
ptCenter	POINT structure that contains the point around which the effect is centered.
uBright	The brightness of the flare. This value is divided internally by 100. This parameter affects the brightness of both the flare, and any lightened circles surrounding the flare.
uFlag	Flag that indicates the lens type. Possible values are:
	Value	Meaning
	LNS_TYPE_1	[0x0000] Standard lens.
	LNS_TYPE_2	[0x0001] Moderate wide-angle lens.
	LNS_TYPE_3	[0x0002] Moderate telephoto lens.
crColor	The COLORREF value that represents the color of the main flare.

Returns

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

Comments

Secondary reflections are caused when bright lights are facing the camera lens. These reflections can show up as spots or banding. The function adds this effect to the bitmap by controlling their number, position, brightness and size of the spots or banding. Each lens type has its own spot distribution and ray thickness.

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.

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

For an example, see the following figure:

$image\Lens_before.gif$

The following figure shows the same bitmap, after the effect has been applied:

$image\Lens_after.gif$

To obtain this effect, the following settings were used with the function:

ptCenter = (150, 162);
uBright = 100;
uFlag = LNS_TYPE_1;
crColor = RGB(255,128,0);

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.

Required DLLs and Libraries

LTIMG

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

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:	L_AddBitmapNoise, L_EmbossBitmap, L_MosaicBitmap, L_MotionBlurBitmap, L_OilifyBitmap, L_PosterizeBitmap, L_RemoveRedeyeBitmap, L_SolarizeBitmap, L_UnderlayBitmap, L_BumpMapBitmap, L_CubismBitmap, L_DrawStarBitmap, L_FreePlaneBendBitmap, L_FreeRadBendBitmap, L_DryBitmap, L_GlowFilterBitmap, L_GlassEffectBitmap, L_LightBitmap, L_OceanBitmap, L_PlaneBendBitmap, L_PlaneBitmap, L_SampleTargetBitmap, L_TunnelBitmap, L_BendingBitmap, L_CylindricalBitmap, L_FreeHandShearBitmap, L_FreeHandWaveBitmap, L_ImpressionistBitmap, L_PixelateBitmap, L_PolarBitmap, L_PunchBitmap, L_RadialBlurBitmap, L_RadWaveBitmap, L_RippleBitmap, L_SpherizeBitmap, L_SwirlBitmap, L_WaveBitmap, L_WindBitmap, L_ZoomBlurBitmap, L_ZoomWaveBitmap, L_ColoredBallsBitmap, L_DiffuseGlowBitmap, L_BricksTextureBitmap, L_CanvasBitmap, L_CloudsBitmap, L_ColoredBallsBitmap, L_DiffuseGlowBitmap, L_DisplaceMapBitmap, L_FragmentBitmap, L_HalfTonePatternBitmap, L_MaskConvolutionBitmap, L_MosaicTilesBitmap, L_OffsetBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap, L_RomanMosaicBitmap, L_VignetteBitmap, L_ZigZagBitmap, L_AdjustBitmapTint, L_ColorHalfToneBitmap
Topics:	Raster Image Functions: Artistic Effects
	Raster Image Functions: Modifying Intensity Values
	Applying Artistic Effects
	Using Color Values in LEADTOOLS
	Raster Image Functions: Correcting Colors

Example

BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
POINT ptCenter;       /*Effect center point*/

/* Load a bitmap at its own bits per pixel  */
L_LoadBitmap(TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);

/*Set the center point in the middle of the first square */
ptCenter.x = LeadBitmap.Width/4;
ptCenter.y = LeadBitmap.Height/4;

/* Apply the lens flare effect to the bitmap*/
L_LensFlareBitmap(&LeadBitmap, ptCenter, 100, LNS_TYPE_1, RGB(100, 150, 10));