void CWin32Font::ApplyGaussianBlurToTexture(int rgbaX, int rgbaY, int rgbaWide, int rgbaTall, unsigned char *rgba)
{
if (!m_pGaussianDistribution)
return;
unsigned char *src = (unsigned char *)_alloca(rgbaWide * rgbaTall * 4);
memcpy(src, rgba, rgbaWide * rgbaTall * 4);
unsigned char *dest = rgba;
for (int y = 0; y < rgbaTall; y++)
{
for (int x = 0; x < rgbaWide; x++)
{
GetBlurValueForPixel(src, m_iBlur, m_pGaussianDistribution, x, y, rgbaWide, rgbaTall, dest);
dest += 4;
}
}
}
//-----------------------------------------------------------------------------
// Purpose: blurs the texture
//-----------------------------------------------------------------------------
void ApplyGaussianBlurToTexture( int rgbaWide, int rgbaTall, unsigned char *rgba, int iBlur )
{
float *pGaussianDistribution;
if ( !iBlur )
return;
// generate the gaussian field
pGaussianDistribution = (float*)_alloca( (iBlur*2+1) * sizeof(float) );
double sigma = 0.683 * iBlur;
for (int x = 0; x <= (iBlur * 2); x++)
{
int val = x - iBlur;
pGaussianDistribution[x] = (float)(1.0f / sqrt(2 * 3.14 * sigma * sigma)) * pow(2.7, -1 * (val * val) / (2 * sigma * sigma));
}
// alloc a new buffer
unsigned char *src = new unsigned char[rgbaWide * rgbaTall * 4];
// copy in
memcpy(src, rgba, rgbaWide * rgbaTall * 4);
// incrementing destination pointer
unsigned char *dest = rgba;
for (int y = 0; y < rgbaTall; y++)
{
for (int x = 0; x < rgbaWide; x++)
{
// scan the source pixel
GetBlurValueForPixel(src, iBlur, pGaussianDistribution, x, y, rgbaWide, rgbaTall, dest);
// move to the next
dest += 4;
}
}
delete[] src;
}
