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PNMImage::rescale()

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This commit is contained in:
David Rose
2012-08-04 17:13:12 +00:00
parent 1f0304c696
commit 37cd123d37
2 changed files with 37 additions and 0 deletions
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35
panda/src/pnmimage/pnmImage.cxx
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@@ -1159,6 +1159,41 @@ threshold(const PNMImage &select_image, int channel, double threshold,
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::rescale
// Access: Published
// Description: Rescales the RGB channel values so that any values in
// the original image between min_val and max_val are
// expanded to the range 0 .. 1. Values below min_val
// are set to 0, and values above max_val are set to 1.
// Does not affect the alpha channel, if any.
////////////////////////////////////////////////////////////////////
void PNMImage::
rescale(double min_val, double max_val) {
double scale = max_val - min_val;
if (_num_channels <= 2) {
// Grayscale.
for (int y = 0; y < get_y_size(); y++) {
for (int x = 0; x < get_x_size(); x++) {
double val = get_gray(x, y);
set_gray(x, y, (val - min_val) / scale);
}
}
} else {
// RGB(A).
for (int y = 0; y < get_y_size(); y++) {
for (int x = 0; x < get_x_size(); x++) {
LRGBColord xel = get_xel(x, y);
set_xel(x, y,
(xel[0] - min_val) / scale,
(xel[1] - min_val) / scale,
(xel[2] - min_val) / scale);
}
}
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::copy_channel
// Access: Published

2
panda/src/pnmimage/pnmImage.h
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@@ -214,6 +214,8 @@ PUBLISHED:
void threshold(const PNMImage &select_image, int channel, double threshold,
const PNMImage &lt, const PNMImage &ge);
void rescale(double min_val, double max_val);
void copy_channel(const PNMImage &copy, int xto, int yto, int cto,
int xfrom = 0, int yfrom = 0, int cfrom = 0,
int x_size = -1, int y_size = -1);