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pnmImage::flip()

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This commit is contained in:
David Rose 2012-09-26 21:55:43 +00:00
parent 0c85073625
commit 0fa4376f8a
2 changed files with 88 additions and 0 deletions
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87
panda/src/pnmimage/pnmImage.cxx
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@ -547,6 +547,93 @@ reverse_rows() {
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::flip
// Access: Published
// Description: Reverses, transposes, and/or rotates the image
// in-place according to the specified parameters. If
// flip_x is true, the x axis is reversed; if flip_y is
// true, the y axis is reversed. Then, if transpose is
// true, the x and y axes are exchanged. These
// parameters can be used to select any combination of
// 90-degree or 180-degree rotations and flips.
////////////////////////////////////////////////////////////////////
void PNMImage::
flip(bool flip_x, bool flip_y, bool transpose) {
if (transpose) {
// Transposed case. X becomes Y, Y becomes X.
if (_array != NULL) {
xel *new_array = (xel *)PANDA_MALLOC_ARRAY(_x_size * _y_size * sizeof(xel));
for (int xi = 0; xi < _x_size; ++xi) {
xel *row = new_array + xi * _y_size;
int source_xi = !flip_x ? xi : _x_size - 1 - xi;
for (int yi = 0; yi < _y_size; ++yi) {
int source_yi = !flip_y ? yi : _y_size - 1 - yi;
xel *source_row = _array + source_yi * _x_size;
row[yi] = source_row[source_xi];
}
}
PANDA_FREE_ARRAY(_array);
_array = new_array;
}
if (_alpha != NULL) {
xelval *new_alpha = (xelval *)PANDA_MALLOC_ARRAY(_x_size * _y_size * sizeof(xelval));
for (int xi = 0; xi < _x_size; ++xi) {
xelval *row = new_alpha + xi * _y_size;
int source_xi = !flip_x ? xi : _x_size - 1 - xi;
for (int yi = 0; yi < _y_size; ++yi) {
int source_yi = !flip_y ? yi : _y_size - 1 - yi;
xelval *source_row = _alpha + source_yi * _x_size;
row[yi] = source_row[source_xi];
}
}
PANDA_FREE_ARRAY(_alpha);
_alpha = new_alpha;
}
int t = _x_size;
_x_size = _y_size;
_y_size = t;
} else {
// Non-transposed. X is X, Y is Y.
if (_array != NULL) {
xel *new_array = (xel *)PANDA_MALLOC_ARRAY(_x_size * _y_size * sizeof(xel));
for (int yi = 0; yi < _y_size; ++yi) {
xel *row = new_array + yi * _x_size;
int source_yi = !flip_y ? yi : _y_size - 1 - yi;
xel *source_row = _array + source_yi * _x_size;
for (int xi = 0; xi < _x_size; ++xi) {
int source_xi = !flip_x ? xi : _x_size - 1 - xi;
row[xi] = source_row[source_xi];
}
}
PANDA_FREE_ARRAY(_array);
_array = new_array;
}
if (_alpha != NULL) {
xelval *new_alpha = (xelval *)PANDA_MALLOC_ARRAY(_x_size * _y_size * sizeof(xelval));
for (int yi = 0; yi < _y_size; ++yi) {
xelval *row = new_alpha + yi * _x_size;
int source_yi = !flip_y ? yi : _y_size - 1 - yi;
xelval *source_row = _alpha + source_yi * _x_size;
for (int xi = 0; xi < _x_size; ++xi) {
int source_xi = !flip_x ? xi : _x_size - 1 - xi;
row[xi] = source_row[source_xi];
}
}
PANDA_FREE_ARRAY(_alpha);
_alpha = new_alpha;
}
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::set_maxval
// Access: Published

1
panda/src/pnmimage/pnmImage.h
View File

@ -117,6 +117,7 @@ PUBLISHED:
INLINE void make_rgb();
BLOCKING void reverse_rows();
BLOCKING void flip(bool flip_x, bool flip_y, bool transpose);
BLOCKING void set_maxval(xelval maxval);