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lavfi/curves: add various const where it makes sense

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This commit is contained in:
Clément Bœsch 2016-07-22 22:00:37 +02:00
parent 51a873d441
commit 4eee06ae87
1 changed files with 17 additions and 17 deletions
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34
libavfilter/vf_curves.c
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@ -212,7 +212,7 @@ static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *
double (*matrix)[3];
double *h, *r;
int n = get_nb_points(points); // number of splines
const int n = get_nb_points(points); // number of splines
if (n == 0) {
for (i = 0; i < 256; i++)
@ -247,9 +247,9 @@ static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *
/* right-side of the polynomials, will be modified to contains the solution */
point = points;
for (i = 1; i < n - 1; i++) {
double yp = point->y,
yc = point->next->y,
yn = point->next->next->y;
const double yp = point->y;
const double yc = point->next->y;
const double yn = point->next->next->y;
r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);
point = point->next;
}
@ -268,8 +268,8 @@ static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *
/* tridiagonal solving of the linear system */
for (i = 1; i < n; i++) {
double den = matrix[i][MD] - matrix[i][BD] * matrix[i-1][AD];
double k = den ? 1./den : 1.;
const double den = matrix[i][MD] - matrix[i][BD] * matrix[i-1][AD];
const double k = den ? 1./den : 1.;
matrix[i][AD] *= k;
r[i] = (r[i] - matrix[i][BD] * r[i - 1]) * k;
}
@ -286,24 +286,24 @@ static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *
i = 0;
av_assert0(point->next); // always at least 2 key points
while (point->next) {
double yc = point->y;
double yn = point->next->y;
const double yc = point->y;
const double yn = point->next->y;
double a = yc;
double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
double c = r[i] / 2.;
double d = (r[i+1] - r[i]) / (6.*h[i]);
const double a = yc;
const double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
const double c = r[i] / 2.;
const double d = (r[i+1] - r[i]) / (6.*h[i]);
int x;
int x_start = point->x * 255;
int x_end = point->next->x * 255;
const int x_start = point->x * 255;
const int x_end = point->next->x * 255;
av_assert0(x_start >= 0 && x_start <= 255 &&
x_end >= 0 && x_end <= 255);
for (x = x_start; x <= x_end; x++) {
double xx = (x - x_start) * 1/255.;
double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
const double xx = (x - x_start) * 1/255.;
const double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
y[x] = av_clip_uint8(yy * 255);
av_log(ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
}
@ -495,7 +495,7 @@ static av_cold int init(AVFilterContext *ctx)
if (av_log_get_level() >= AV_LOG_VERBOSE) {
for (i = 0; i < NB_COMP; i++) {
struct keypoint *point = comp_points[i];
const struct keypoint *point = comp_points[i];
av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);
while (point) {
av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);