//Set a pixel's greyness
//From http://www.richelbilderbeek.nl
void SetGreyness(
TImage * const image,
const int x,
const int y,
const unsigned char grey)
{
assert(image!=0 && "Image is NULL");
assert(image->Picture->Bitmap!=0 && "Bitmap is NULL");
assert(image->Picture->Bitmap->PixelFormat == pf24bit && "Bitmap must be 24 bit");
assert( x >= 0 && "x coordinat is below zero");
assert( y >= 0 && "y coordinat is below zero");
assert( x < image->Picture->Bitmap->Width && "x coordinat is beyond image width");
assert( y < image->Picture->Bitmap->Height && "y coordinat is beyond image height");
unsigned char * const myLine
= static_cast<unsigned char *>(image->Picture->Bitmap->ScanLine[y]);
myLine[x*3+2] = grey;
myLine[x*3+1] = grey;
myLine[x*3+0] = grey;
}
//Set a line of pixel's greyness
//From http://www.richelbilderbeek.nl
void SetGreyness(
TImage * const image,
const int x1,
const int x2,
const int y,
const unsigned char grey)
{
assert(image!=0 && "Image is NULL");
assert(image->Picture->Bitmap!=0 && "Bitmap is NULL");
assert(image->Picture->Bitmap->PixelFormat == pf24bit && "Bitmap must be 24 bit");
assert( x1 >= 0 && "x1 coordinat is below zero");
assert( x2 >= 0 && "x2 coordinat is below zero");
assert( y >= 0 && "y coordinat is below zero");
assert( x1 < image->Picture->Bitmap->Width && "x1 coordinat is beyond image width");
assert( x2 <= image->Picture->Bitmap->Width && "x2 coordinat is beyond image width");
assert( y < image->Picture->Bitmap->Height && "y coordinat is beyond image height");
unsigned char * const myLine
= static_cast<unsigned char *>(image->Picture->Bitmap->ScanLine[y]);
for (int x=x1; x!=x2; ++x)
{
myLine[x*3+2] = grey;
myLine[x*3+1] = grey;
myLine[x*3+0] = grey;
}
}
//Set a square of pixels' greyness
//From http://www.richelbilderbeek.nl
void SetGreyness(
TImage * const image,
const int x1,
const int y1,
const int x2,
const int y2,
const unsigned char grey)
{
for (int y=y1; y!=y2; ++y)
{
SetGreyness(image,x1,x2,y,grey);
}
}
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