#include "ltwrappr.h"
virtual L_INT LBitmap::AddShadow (uAngle, uThreshold, uFlags)
L_UINT uAngle; |
shadow or light direction |
L_UINT uThreshold; |
threshold value |
L_UINT uFlags; |
flag |
Adds shadows to the bitmap.
Parameter | Description | |
uAngle | Angle value indicating the direction of the light source producing the shadow. Possible values are: | |
Value | Meaning | |
SHADOW_E | [0] East | |
SHADOW_NE | [1] Northeast | |
SHADOW_N | [2] North | |
SHADOW_NW | [3] Northwest | |
SHADOW_W | [4] West | |
SHADOW_SW | [5] Southwest | |
SHADOW_S | [6] South | |
SHADOW_SE | [7] Southeast | |
uThreshold | Threshold value used to determine which pixels will be affected . Valid values range from 0 through 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 through 4095 for 12-bit grayscale images. Otherwise, it is from 0 through 255. When uFlags = COLOR_RGB, any component (R, G, or B) of a pixel with a value less than the uThreshold value is not affected. When uFlags = COLOR_GRAY, any pixel where the master channel value</b>* is less than the uThreshold value is not affected. | |
uFlags | Type of the shadow. Possible values are: | |
Value | Meaning | |
SHADOW_CLR_RGB | [0] Shadows are colored. | |
SHADOW_CLR_GRAY | [1] Shadows are grayscale. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
This function applies a convolution matrix upon each color component and then combines the results in order to add shadows.
Support for 12- and 16-bit grayscale and 48- and 64-bit color images is available only in the Document/Medical toolkits.
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.
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
In order to speed up widely used image processing filters in LEADTOOLS, the grayscale value (master channel) of a colored image is calculated using the following formulas:
#define CalcGrayValue(r, g, b) ((L_UCHAR)(((L_UCHAR) (((2 * (L_UINT) (r)) + (5 * (L_UINT) (g)) + (L_UINT) (b) + 4) / 8))))
#define CalcGrayValue16(r, g, b) ((L_UINT16) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8))
#define CalcGrayValue32(r, g, b) ((L_UINT32) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8))
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. |
Win32, x64.
L_INT LBitmap__AddShadowExample(LBitmap *pLeadBitmap)
{
/* Apply shadow effect to the image*/
return pLeadBitmap->AddShadow (SHADOW_SE, 0, SHADOW_CLR_GRAY);
}
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