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raise precision of 16-bit image processing

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This commit is contained in:
David Rose 2012-11-02 01:14:51 +00:00
parent 94bf21b65c
commit 7299a150c3
3 changed files with 18 additions and 20 deletions
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28
panda/src/grutil/pfmVizzer.cxx
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@ -312,12 +312,12 @@ generate_vis_mesh(MeshFace face) const {
// map. This can be passed to make_displacement(); see
// that function for more information.
////////////////////////////////////////////////////////////////////
int PfmVizzer::
double PfmVizzer::
calc_max_u_displacement() const {
int x_size = _pfm.get_x_size();
int y_size = _pfm.get_y_size();
int max_u = 0;
double max_u = 0;
for (int yi = 0; yi < y_size; ++yi) {
for (int xi = 0; xi < x_size; ++xi) {
@ -326,10 +326,9 @@ calc_max_u_displacement() const {
}
const LPoint3f &point = _pfm.get_point(xi, yi);
double nxi = point[0] * (double)(x_size - 1) + 0.5;
double nyi = point[1] * (double)(y_size - 1) + 0.5;
double nxi = point[0] * (double)(x_size - 1);
max_u = max(max_u, (int)cceil(cabs(nxi - (double)xi)));
max_u = max(max_u, cabs(nxi - (double)xi));
}
}
@ -344,12 +343,12 @@ calc_max_u_displacement() const {
// map. This can be passed to make_displacement(); see
// that function for more information.
////////////////////////////////////////////////////////////////////
int PfmVizzer::
double PfmVizzer::
calc_max_v_displacement() const {
int x_size = _pfm.get_x_size();
int y_size = _pfm.get_y_size();
int max_v = 0;
double max_v = 0;
for (int yi = 0; yi < y_size; ++yi) {
for (int xi = 0; xi < x_size; ++xi) {
@ -358,9 +357,9 @@ calc_max_v_displacement() const {
}
const LPoint3f &point = _pfm.get_point(xi, yi);
double nyi = point[1] * (double)(y_size - 1) + 0.5;
double nyi = point[1] * (double)(y_size - 1);
max_v = max(max_v, (int)cceil(cabs(nyi - (double)yi)));
max_v = max(max_v, cabs(nyi - (double)yi));
}
}
@ -386,13 +385,12 @@ calc_max_v_displacement() const {
// for max_u and max_v.
////////////////////////////////////////////////////////////////////
void PfmVizzer::
make_displacement(PNMImage &result, int max_u, int max_v) const {
make_displacement(PNMImage &result, double max_u, double max_v) const {
int x_size = _pfm.get_x_size();
int y_size = _pfm.get_y_size();
result.clear(x_size, y_size, 3, PNM_MAXMAXVAL);
result.fill(0.5);
for (int yi = 0; yi < y_size; ++yi) {
for (int xi = 0; xi < x_size; ++xi) {
if (!_pfm.has_point(xi, yi)) {
@ -400,11 +398,11 @@ make_displacement(PNMImage &result, int max_u, int max_v) const {
}
const LPoint3f &point = _pfm.get_point(xi, yi);
double nxi = point[0] * (double)(x_size - 1) + 0.5;
double nyi = point[1] * (double)(y_size - 1) + 0.5;
double nxi = point[0] * (double)(x_size - 1);
double nyi = point[1] * (double)(y_size - 1);
double u_shift = (nxi - (double)xi) / (double)max_u;
double v_shift = (nyi - (double)yi) / (double)max_v;
double u_shift = (nxi - (double)xi) / max_u;
double v_shift = (nyi - (double)yi) / max_v;
result.set_red(xi, yi, u_shift * 0.5 + 0.5);
result.set_green(xi, yi, v_shift * 0.5 + 0.5);

6
panda/src/grutil/pfmVizzer.h
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@ -74,9 +74,9 @@ PUBLISHED:
};
BLOCKING NodePath generate_vis_mesh(MeshFace face = MF_front) const;
BLOCKING int calc_max_u_displacement() const;
BLOCKING int calc_max_v_displacement() const;
BLOCKING void make_displacement(PNMImage &result, int max_u, int max_v) const;
BLOCKING double calc_max_u_displacement() const;
BLOCKING double calc_max_v_displacement() const;
BLOCKING void make_displacement(PNMImage &result, double max_u, double max_v) const;
private:
void make_vis_mesh_geom(GeomNode *gnode, bool inverted) const;

4
panda/src/pnmimage/pnm-image-filter.cxx
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@ -62,19 +62,19 @@
// are usually 8 bits per channel), it doesn't cost any precision at all to
// use shorts, and not very much to use chars.
/*
// To use double-precision floating point, 8 bytes: (strictly for the neurotic)
typedef double WorkType;
typedef double StoreType;
static const WorkType source_max = 1.0;
static const WorkType filter_max = 1.0;
*/
/*
// To use single-precision floating point, 4 bytes:
typedef double WorkType;
typedef float StoreType;
static const WorkType source_max = 1.0;
static const WorkType filter_max = 1.0;
*/
/*
// To use 16-bit integer arithmetic, 2 bytes: