void
resizeLatLong (const EnvmapImage &image1,
EnvmapImage &image2,
const Box2i &image2DataWindow,
float filterRadius,
int numSamples)
{
int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;
int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;
float radius = 0.5f * 2 * M_PI * filterRadius / w;
image2.resize (ENVMAP_LATLONG, image2DataWindow);
image2.clear ();
Array2D<Rgba> &pixels = image2.pixels();
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
{
V3f dir = LatLongMap::direction (image2DataWindow, V2f (x, y));
pixels[y][x] = image1.filteredLookup (dir, radius, numSamples);
}
}
}
void
resizeCube (const EnvmapImage &image1,
EnvmapImage &image2,
const Box2i &image2DataWindow,
float filterRadius,
int numSamples)
{
if (image1.type() == ENVMAP_CUBE && image1.dataWindow() == image2DataWindow)
{
//
// Special case - the input image is a cube-face environment
// map with the same size as the output image. We can copy
// the input image without resampling.
//
image2.resize (ENVMAP_CUBE, image2DataWindow);
int w = image2DataWindow.max.x - image2DataWindow.min.x + 1;
int h = image2DataWindow.max.y - image2DataWindow.min.y + 1;
memcpy (&(image2.pixels()[0][0]),
&(image1.pixels()[0][0]),
sizeof (Rgba) * w * h);
return;
}
//
// Resampe the input image
//
int sof = CubeMap::sizeOfFace (image2DataWindow);
float radius = 1.5f * filterRadius / sof;
image2.resize (ENVMAP_CUBE, image2DataWindow);
image2.clear ();
Array2D<Rgba> &pixels = image2.pixels();
for (int f = CUBEFACE_POS_X; f <= CUBEFACE_NEG_Z; ++f)
{
CubeMapFace face = CubeMapFace (f);
for (int y = 0; y < sof; ++y)
{
for (int x = 0; x < sof; ++x)
{
V2f posInFace (x, y);
V3f dir =
CubeMap::direction (face, image2DataWindow, posInFace);
V2f pos =
CubeMap::pixelPosition (face, image2DataWindow, posInFace);
pixels[int (pos.y + 0.5f)][int (pos.x + 0.5f)] =
image1.filteredLookup (dir, radius, numSamples);
}
}
}
}