1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
/--------------------------------------------------------------------
|
| $Id: shadow.h,v 1.5 2002/03/31 13:36:42 uzadow Exp $
| Shadow Graphic item class
|
| A shadowed region on a canvas. The item is basically a
| partially transparent region. Transparency is defined by an
| alpha DIB and a global transparency value. Most of the code
| was just copied from CDIBGrItem & changed a bit.
|
| Copyright (c) 1996-2002 Ulrich von Zadow
|
\--------------------------------------------------------------------
*/
#ifndef INCL_SHADOW
#define INCL_SHADOW
#include "plbitmap.h"
#include "gritem.h"
class CShadowItem : public CGrItem
{
DECLARE_DYNAMIC (CShadowItem);
public:
CShadowItem
( int x, // Position on the canvas
int y,
int w, // Width
int h, // Height
int z, // Position in z-Order
PLBYTE Opacity, // Opacity of the object. 255 is completely
// opaque, 0 is completely transparent.
PLPixel32 * pColor, // Shadow color.
PLBmp * pAlphaBmp // Alpha channel (must be 8 bpp). Can be NULL.
);
~CShadowItem
();
virtual void Draw
( PLBmp * pCanvas,
CRect * pUpdateRect
);
// Responsible for drawing the object on the canvas.
// Member variables.
PLPixel32 m_Color; // Shadow color
PLBmp * m_pAlphaBmp;
PLBYTE ** m_pLineArray;
private:
void drawClippedNoScale
( PLBmp * pCanvas,
CRect * pRect
);
// Draws the object. pRect must have been clipped already.
// Assumes that no scaling is nessesary.
void drawAlphaLine
( PLBYTE * pDest,
PLBYTE * pAlpha,
CRect * pRect
);
void drawFadeLine
( PLBYTE * pDest,
CRect * pRect
);
// Draws one line. No scaling. Assumes alpha channel doesn't
// exist.
void drawClipped
( PLBmp * pCanvas,
CRect * pRect
);
// Draws the object. pRect must have been clipped already.
void drawScaleLine
( PLBYTE * pDest,
PLBYTE * pAlpha,
CRect * pRect
);
};
#endif
/*
/--------------------------------------------------------------------
|
| $Log: shadow.h,v $
| Revision 1.5 2002/03/31 13:36:42 uzadow
| Updated copyright.
|
| Revision 1.4 2001/09/16 19:03:23 uzadow
| Added global name prefix PL, changed most filenames.
|
|
--------------------------------------------------------------------
*/
|
