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add PfmFile::indirect_1d_lookup()

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This commit is contained in:
David Rose 2016-02-19 18:11:57 -08:00
parent 1c9985d2f7
commit 0385da0f44
3 changed files with 63 additions and 2 deletions
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58
panda/src/pnmimage/pfmFile.cxx
View File

@ -2158,6 +2158,64 @@ operator *= (float multiplier) {
}
}
/**
* index_image is a WxH 1-channel image, while pixel_values is an Nx1
* image with any number of channels. Typically pixel_values will be
* a 256x1 image.
*
* Fills the PfmFile with a new image the same width and height as
* index_image, with the same number of channels as pixel_values.
*
* Each pixel of the new image is computed with the formula:
*
* new_image(x, y) = pixel_values(index_image(x, y)[channel], 0)
*
* At present, no interpolation is performed; the nearest value in
* pixel_values is discovered. This may change in the future.
*/
void PfmFile::
indirect_1d_lookup(const PfmFile &index_image, int channel,
const PfmFile &pixel_values) {
clear(index_image.get_x_size(), index_image.get_y_size(),
pixel_values.get_num_channels());
for (int yi = 0; yi < get_y_size(); ++yi) {
switch (get_num_channels()) {
case 1:
for (int xi = 0; xi < get_x_size(); ++xi) {
int v = int(index_image.get_channel(xi, yi, channel) * (pixel_values.get_x_size() - 1) + 0.5);
nassertv(v >= 0 && v < pixel_values.get_x_size());
set_point1(xi, yi, pixel_values.get_point1(v, 0));
}
break;
case 2:
for (int xi = 0; xi < get_x_size(); ++xi) {
int v = int(index_image.get_channel(xi, yi, channel) * (pixel_values.get_x_size() - 1) + 0.5);
nassertv(v >= 0 && v < pixel_values.get_x_size());
set_point2(xi, yi, pixel_values.get_point2(v, 0));
}
break;
case 3:
for (int xi = 0; xi < get_x_size(); ++xi) {
int v = int(index_image.get_channel(xi, yi, channel) * (pixel_values.get_x_size() - 1) + 0.5);
nassertv(v >= 0 && v < pixel_values.get_x_size());
set_point3(xi, yi, pixel_values.get_point3(v, 0));
}
break;
case 4:
for (int xi = 0; xi < get_x_size(); ++xi) {
int v = int(index_image.get_channel(xi, yi, channel) * (pixel_values.get_x_size() - 1) + 0.5);
nassertv(v >= 0 && v < pixel_values.get_x_size());
set_point4(xi, yi, pixel_values.get_point4(v, 0));
}
break;
}
}
}
/**
* Adjusts each channel of the image by raising the corresponding component
* value to the indicated exponent, such that L' = L ^ exponent.

3
panda/src/pnmimage/pfmFile.h
View File

@ -158,6 +158,9 @@ PUBLISHED:
void operator *= (float multiplier);
void indirect_1d_lookup(const PfmFile &index_image, int channel,
const PfmFile &pixel_values);
INLINE void gamma_correct(float from_gamma, float to_gamma);
INLINE void gamma_correct_alpha(float from_gamma, float to_gamma);
INLINE void apply_exponent(float gray_exponent);

4
panda/src/pnmimage/pnmImage.cxx
View File

@ -1667,8 +1667,8 @@ fill_distance_outside(const PNMImage &mask, float threshold, int radius) {
*
* new_image(x, y) = pixel_values(index_image(x, y)[channel], 0)
*
* No interpolation is performed; the nearest value in pixel_values is
* discovered.
* At present, no interpolation is performed; the nearest value in
* pixel_values is discovered. This may change in the future.
*/
void PNMImage::
indirect_1d_lookup(const PNMImage &index_image, int channel,