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add PNMImage::threshold()

This commit is contained in:
David Rose 2009-12-16 06:57:52 +00:00
parent 538b8dafdc
commit 849dc8cccb
2 changed files with 98 additions and 0 deletions
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94
panda/src/pnmimage/pnmImage.cxx
View File

@ -939,6 +939,100 @@ lighten_sub_image(const PNMImage &copy, int xto, int yto,
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::threshold
// Access: Published
// Description: Selectively copies each pixel from either one source
// or another source, depending on the alpha channel of
// alpha_image.
//
// For each pixel (x, y), assigns the corresponding
// pixel (x, y) in this image to:
//
// lt.get_xel(x, y) if alpha_image(x, y).get_alpha() <=
// threshold, or
//
// ge.get_xel(x, y) if alpha_image(x, y).get_alpha() >
// threshold
//
// Any of alpha_image, lt, or ge may be the same PNMImge
// object as this image, or the same as each other; or
// they may all be different.
//
// All images must be the same size.
////////////////////////////////////////////////////////////////////
void PNMImage::
threshold(const PNMImage &alpha_image,
const PNMImage &lt, const PNMImage &ge,
double threshold) {
nassertv(get_x_size() <= alpha_image.get_x_size() && get_y_size() <= alpha_image.get_y_size());
nassertv(get_x_size() <= lt.get_x_size() && get_y_size() <= lt.get_y_size());
nassertv(get_x_size() <= ge.get_x_size() && get_y_size() <= ge.get_y_size());
nassertv(alpha_image.has_alpha());
xelval threshold_val = (xelval)(alpha_image.get_maxval() * threshold + 0.5);
if (get_maxval() == lt.get_maxval() && get_maxval() == ge.get_maxval()) {
// Simple case: the maxvals are all equal. Copy by integer value.
int x, y;
if (has_alpha() && lt.has_alpha() && ge.has_alpha()) {
// Copy alpha channel too.
for (y = 0; y < get_y_size(); y++) {
for (x = 0; x < get_x_size(); x++) {
if (alpha_image.get_alpha_val(x, y) < threshold_val) {
set_xel_val(x, y, lt.get_xel_val(x, y));
set_alpha_val(x, y, lt.get_alpha_val(x, y));
} else {
set_xel_val(x, y, ge.get_xel_val(x, y));
set_alpha_val(x, y, ge.get_alpha_val(x, y));
}
}
}
} else {
// Don't copy alpha channel.
for (y = 0; y < get_y_size(); y++) {
for (x = 0; x < get_x_size(); x++) {
if (alpha_image.get_alpha_val(x, y) < threshold_val) {
set_xel_val(x, y, lt.get_xel_val(x, y));
} else {
set_xel_val(x, y, ge.get_xel_val(x, y));
}
}
}
}
} else {
// General case: the maxvals are different. Copy by floating-point value.
int x, y;
if (has_alpha() && lt.has_alpha() && ge.has_alpha()) {
for (y = 0; y < get_y_size(); y++) {
for (x = 0; x < get_x_size(); x++) {
if (alpha_image.get_alpha_val(x, y) < threshold_val) {
set_xel(x, y, lt.get_xel(x, y));
set_alpha(x, y, lt.get_alpha(x, y));
} else {
set_xel(x, y, ge.get_xel(x, y));
set_alpha(x, y, ge.get_alpha(x, y));
}
}
}
} else {
for (y = 0; y < get_y_size(); y++) {
for (x = 0; x < get_x_size(); x++) {
if (alpha_image.get_alpha_val(x, y) < threshold_val) {
set_xel(x, y, lt.get_xel(x, y));
} else {
set_xel(x, y, ge.get_xel(x, y));
}
}
}
}
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::copy_channel
// Access: Published

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

@ -206,6 +206,10 @@ PUBLISHED:
int xfrom = 0, int yfrom = 0,
int x_size = -1, int y_size = -1,
double pixel_scale = 1.0);
void threshold(const PNMImage &alpha_image,
const PNMImage &lt, const PNMImage &ge,
double threshold);
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);