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
|
/*
* BitmapBrush.h
*
* Created on: Nov 18, 2012
* Author: Simon Robertshaw
*/
#ifndef BTIMAPBRUSH_H_
#define BTIMAPBRUSH_H_
#include <vector>
#include <cmath>
#include "Brush.h"
class BitmapBrush: public Brush
{
protected:
ui::Point origSize;
unsigned char * origBitmap;
public:
BitmapBrush(std::vector<unsigned char> newBitmap, ui::Point rectSize_):
Brush(ui::Point(0, 0)),
origSize(0, 0)
{
ui::Point newSize = rectSize_;
//Ensure the rect has odd dimentions so we can pull an integer radius with a 1x1 centre
if(!(newSize.X % 2))
newSize.X += 1;
if(!(newSize.Y % 2))
newSize.Y += 1;
radius = (newSize-ui::Point(1, 1))/2;
size = newSize;
origSize = size;
origBitmap = new unsigned char[size.X*size.Y];
std::fill(origBitmap, origBitmap+(size.X*size.Y), 0);
for(int y = 0; y < rectSize_.Y; y++)
{
for(int x = 0; x < rectSize_.X; x++)
{
if(newBitmap[(y*rectSize_.X)+x] >= 128)
origBitmap[(y*size.X)+x] = newBitmap[(y*rectSize_.X)+x];
}
}
SetRadius(radius);
};
virtual void GenerateBitmap()
{
if(origBitmap)
{
if(bitmap)
delete[] bitmap;
bitmap = new unsigned char[size.X*size.Y];
if(size == origSize)
std::copy(origBitmap, origBitmap+(origSize.X*origSize.Y), bitmap);
else
{
//Bilinear interpolation
float factorX = ((float)origSize.X)/((float)size.X);
float factorY = ((float)origSize.Y)/((float)size.Y);
for(int y = 0; y < size.Y; y++)
{
for(int x = 0; x < size.X; x++)
{
float originalY = ((float)y)*factorY;
float originalX = ((float)x)*factorX;
int lowerX = std::floor(originalX);
int upperX = std::min((float)(origSize.X-1), std::floor(originalX+1.0f));
int lowerY = std::floor(originalY);
int upperY = std::min((float)(origSize.Y-1), std::floor(originalY+1.0f));
unsigned char topRight = origBitmap[(lowerY*origSize.X)+upperX];
unsigned char topLeft = origBitmap[(lowerY*origSize.X)+lowerX];
unsigned char bottomRight = origBitmap[(upperY*origSize.X)+upperX];
unsigned char bottomLeft = origBitmap[(upperY*origSize.X)+lowerX];
float top = LinearInterpolate<float>(topLeft, topRight, lowerX, upperX, originalX);
float bottom = LinearInterpolate<float>(bottomLeft, bottomRight, lowerX, upperX, originalX);
float mid = LinearInterpolate<float>(top, bottom, lowerY, upperY, originalY);
bitmap[(y*size.X)+x] = mid > 128 ? 255 : 0;
}
}
}
}
}
virtual ~BitmapBrush()
{
if(origBitmap)
delete[] origBitmap;
}
};
#endif /* BTIMAPBRUSH_H_ */
|
