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Check against DBL_EPSILON instead of 0

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Also clean up some other bits of the recolor code.
This commit is contained in:
Sebastian Ramacher 2018-03-18 18:03:05 +01:00
parent dcd860ef6d
commit 3d4551b263
1 changed files with 15 additions and 20 deletions
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35
zathura/render.c
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@ -541,17 +541,17 @@ emit_completed_signal(void* data)
Assumes that l is in the interval l1, l2 and corrects the value to Assumes that l is in the interval l1, l2 and corrects the value to
force u=0 on l1 and l2 */ force u=0 on l1 and l2 */
static double static double
colorumax(const double* h, double l, double l1, double l2) colorumax(const double h[3], double l, double l1, double l2)
{ {
if (h[0] == 0 && h[1] == 0 && h[2] == 0) { if (fabs(h[0]) <= DBL_EPSILON && fabs(h[1]) <= DBL_EPSILON && fabs(h[2]) <= DBL_EPSILON) {
return 0; return 0;
} }
const double lv = (l - l1)/(l2 - l1); /* Remap l to the whole interval 0,1 */ const double lv = (l - l1) / (l2 - l1); /* Remap l to the whole interval [0,1] */
double u = 1000000; double u = 1000000;
double v = u; double v = u;
for (int k = 0; k < 3; k++) { for (int k = 0; k < 3; k++) {
if (h[k] > 0) { if (h[k] > DBL_EPSILON) {
const double uu = fabs((1-l)/h[k]); const double uu = fabs((1-l)/h[k]);
const double vv = fabs((1-lv)/h[k]); const double vv = fabs((1-lv)/h[k]);
@ -561,7 +561,7 @@ colorumax(const double* h, double l, double l1, double l2)
if (vv < v) { if (vv < v) {
v = vv; v = vv;
} }
} else if (h[k] < 0) { } else if (h[k] < -DBL_EPSILON) {
const double uu = fabs(l/h[k]); const double uu = fabs(l/h[k]);
const double vv = fabs(lv/h[k]); const double vv = fabs(lv/h[k]);
@ -607,8 +607,9 @@ recolor(private_t* priv, zathura_page_t* page, unsigned int page_width,
/* RGB weights for computing lightness. Must sum to one */ /* RGB weights for computing lightness. Must sum to one */
static const double a[] = {0.30, 0.59, 0.11}; static const double a[] = {0.30, 0.59, 0.11};
#define rgb1 priv->recolor.dark const GdkRGBA rgb1 = priv->recolor.dark;
#define rgb2 priv->recolor.light const GdkRGBA rgb2 = priv->recolor.light;
const double l1 = a[0]*rgb1.red + a[1]*rgb1.green + a[2]*rgb1.blue; const double l1 = a[0]*rgb1.red + a[1]*rgb1.green + a[2]*rgb1.blue;
const double l2 = a[0]*rgb2.red + a[1]*rgb2.green + a[2]*rgb2.blue; const double l2 = a[0]*rgb2.red + a[1]*rgb2.green + a[2]*rgb2.blue;
@ -630,7 +631,7 @@ recolor(private_t* priv, zathura_page_t* page, unsigned int page_width,
rectangles = girara_list_new(); rectangles = girara_list_new();
if (rectangles == NULL) { if (rectangles == NULL) {
found_images = false; found_images = false;
girara_warning("Failed to retrieve images.\n"); girara_warning("Failed to retrieve images.");
} }
if (found_images == true) { if (found_images == true) {
@ -687,20 +688,17 @@ recolor(private_t* priv, zathura_page_t* page, unsigned int page_width,
/* u is the maximum possible saturation for given h and l. s is a /* u is the maximum possible saturation for given h and l. s is a
* rescaled saturation between 0 and 1 */ * rescaled saturation between 0 and 1 */
double u = colorumax(h, l, 0, 1); const double u = colorumax(h, l, 0, 1);
double s = 0; const double s = fabs(u) > DBL_EPSILON ? 1.0 / u : 0.0;
if (u != 0) {
s = 1/u;
}
/* Interpolates lightness between light and dark colors. white goes to /* Interpolates lightness between light and dark colors. white goes to
* light, and black goes to dark. */ * light, and black goes to dark. */
l = l * (l2 - l1) + l1; l = l * (l2 - l1) + l1;
u = colorumax(h, l, l1, l2);
data[2] = (unsigned char)round(255.*(l + s*u * h[0])); const double su = s * colorumax(h, l, l1, l2);
data[1] = (unsigned char)round(255.*(l + s*u * h[1])); data[2] = (unsigned char)round(255.*(l + su * h[0]));
data[0] = (unsigned char)round(255.*(l + s*u * h[2])); data[1] = (unsigned char)round(255.*(l + su * h[1]));
data[0] = (unsigned char)round(255.*(l + su * h[2]));
} else { } else {
/* linear interpolation between dark and light with color ligtness as /* linear interpolation between dark and light with color ligtness as
* a parameter */ * a parameter */
@ -719,9 +717,6 @@ recolor(private_t* priv, zathura_page_t* page, unsigned int page_width,
} }
cairo_surface_mark_dirty(surface); cairo_surface_mark_dirty(surface);
#undef rgb1
#undef rgb2
} }
static bool static bool