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Some comments chenged

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This commit is contained in:
Ilia Popov
2010-10-31 16:25:19 +01:00
parent b8df463393
commit 2df298b929
1 changed files with 6 additions and 105 deletions
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111
rtengine/ipresize.cc
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@@ -47,108 +47,6 @@ inline double Lanc(double x, double a)
}
}
void Lanczos1(Image16* src, Image16* dst, double scale)
{
const double delta = 1.0 / scale;
const double a = 3.0;
const double sc = std::min(scale, 1.0);
const int support = (int)(2.0 * a / sc) + 1;
Image16 * tmp = new Image16(src->width, dst->height);
#pragma omp parallel for
for (int i = 0; i < tmp->height; i++) {
// y coord of the center of pixel on src image
double y0 = (i + 0.5) * delta - 0.5;
// weights for interpolation in y direction
double w[support];
// sum of weights used for normalization
double ww = 0.0;
int ii0 = std::max(0, (int)floor(y0 - a / sc) + 1);
int ii1 = std::min(src->height, (int)floor(y0 + a / sc) + 1);
// calculate weights
for (int ii = ii0; ii < ii1; ii++) {
int k = ii - ii0;
double z = sc * (y0 - ii);
w[k] = Lanc(z, a);
ww += w[k];
}
// normalize weights
for (int k = 0; k < support; k++) {
w[k] /= ww;
}
for (int j = 0; j < tmp->width; j++) {
double r = 0.0, g = 0.0, b = 0.0;
for (int ii = ii0; ii < ii1; ii++) {
int k = ii - ii0;
r += w[k] * src->r[ii][j];
g += w[k] * src->g[ii][j];
b += w[k] * src->b[ii][j];
}
tmp->r[i][j] = CLIP((int)r);
tmp->g[i][j] = CLIP((int)g);
tmp->b[i][j] = CLIP((int)b);
}
}
#pragma omp parallel for
for (int j = 0; j < dst->width; j++) {
// x coord of the center of pixel on src image
double x0 = (j + 0.5) * delta - 0.5;
// weights for interpolation in y direction
double w[support];
// sum of weights used for normalization
double ww = 0.0;
int jj0 = std::max(0, (int)floor(x0 - a / sc) + 1);
int jj1 = std::min(tmp->width, (int)floor(x0 + a / sc) + 1);
// calculate weights
for (int jj = jj0; jj < jj1; jj++) {
int k = jj - jj0;
double z = sc * (x0 - jj);
w[k] = Lanc(z, a);
ww += w[k];
}
// normalize weights
for (int k = 0; k < support; k++) {
w[k] /= ww;
}
for (int i = 0; i < dst->height; i++) {
double r = 0.0, g = 0.0, b = 0.0;
for (int jj = jj0; jj < jj1; jj++) {
int k = jj - jj0;
r += w[k] * tmp->r[i][jj];
g += w[k] * tmp->g[i][jj];
b += w[k] * tmp->b[i][jj];
}
dst->r[i][j] = CLIP((int)r);
dst->g[i][j] = CLIP((int)g);
dst->b[i][j] = CLIP((int)b);
}
}
delete tmp;
}
void Lanczos2(Image16* src, Image16* dst, double scale)
{
const double delta = 1.0 / scale;
@@ -156,9 +54,12 @@ void Lanczos2(Image16* src, Image16* dst, double scale)
const double sc = std::min(scale, 1.0);
const int support = (int)(2.0 * a / sc) + 1;
// storage for precomputed parameters for horisontal interpolation
double * wwh = new double[support * dst->width];
int * jj0 = new int[dst->width];
int * jj1 = new int[dst->width];
// temporal storage for vertically-interpolated row of pixels
double * lr = new double[src->width];
double * lg = new double[src->width];
double * lb = new double[src->width];
@@ -193,7 +94,7 @@ void Lanczos2(Image16* src, Image16* dst, double scale)
}
}
// phase2: do actual interpolation
// Phase 2: do actual interpolation
for (int i = 0; i < dst->height; i++) {
@@ -209,7 +110,7 @@ void Lanczos2(Image16* src, Image16* dst, double scale)
int ii0 = std::max(0, (int)floor(y0 - a / sc) + 1);
int ii1 = std::min(src->height, (int)floor(y0 + a / sc) + 1);
// calculate weights
// calculate weights for vertical interpolation
for (int ii = ii0; ii < ii1; ii++) {
int k = ii - ii0;
double z = sc * (y0 - ii);
@@ -240,7 +141,7 @@ void Lanczos2(Image16* src, Image16* dst, double scale)
lb[j] = b;
}
//Do horisontal interpolation
// Do horisontal interpolation
for(int j = 0; j < dst->width; j++) {
double * wh = wwh + support * j;