L_AddShadowBitmap
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_AddShadowBitmap(pBitmap, uAngle, uThreshold, uFlags)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_UINT uAngle; |
/* shadow or light direction */ |
L_UINT uThreshold; |
/* threshold value */ |
L_UINT uFlags; |
/* flag */ |
Adds shadows to the bitmap. 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. |
|
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 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. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function applies a convolution matrix upon each color component and then combines the results in order to add shadows.
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.
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
Example
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
/* Load a bitmap at its own bits per pixel */
L_LoadBitmap(TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Apply shadow effect to the image*/
L_AddShadowBitmap(&LeadBitmap, SHADOW_SE, 0, SHADOW_CLR_GRAY);