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Allow resizing of custom brushes

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This commit is contained in:
Simon Robertshaw 2012-11-18 22:25:24 +00:00
parent f3307e47a8
commit da554cfef2
1 changed files with 52 additions and 12 deletions
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64
src/game/BitmapBrush.h
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@ -14,9 +14,13 @@
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))
Brush(ui::Point(0, 0)),
origSize(0, 0)
{
ui::Point newSize = rectSize_;
@ -28,28 +32,64 @@ public:
radius = (newSize-ui::Point(1, 1))/2;
size = newSize;
origSize = size;
if(bitmap)
delete[] bitmap;
bitmap = new unsigned char[size.X*size.Y];
std::fill(bitmap, bitmap+(size.X*size.Y), 0);
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++)
{
bitmap[(y*size.X)+x] = newBitmap[(y*rectSize_.X)+x];
if(newBitmap[(y*rectSize_.X)+x] >= 128)
origBitmap[(y*size.X)+x] = newBitmap[(y*rectSize_.X)+x];
}
}
updateOutline();
SetRadius(radius);
};
virtual void SetRadius(ui::Point radius)
{
//Do nothing... this brush is a fixed size
}
virtual void GenerateBitmap()
{
//Do nothing
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;
}
};