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Coding style.

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This commit is contained in:
Sebastian Ramacher 2012-08-01 16:15:35 +02:00
parent c57463a053
commit 9c28be7c11
1 changed files with 53 additions and 46 deletions
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99
render.c
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@ -89,7 +89,7 @@ render_page(render_thread_t* render_thread, zathura_page_t* page)
return true; return true;
} }
void static void
color2double(GdkColor* col, double* v) color2double(GdkColor* col, double* v)
{ {
v[0] = (double) col->red / 65535.; v[0] = (double) col->red / 65535.;
@ -100,7 +100,7 @@ color2double(GdkColor* col, double* v)
/* Returns the maximum possible saturation for given h and l. /* Returns the maximum possible saturation for given h and l.
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 */
double static double
colorumax(double* h, double l, double l1, double l2) colorumax(double* h, double l, double l1, double l2)
{ {
double u, uu, v, vv, lv; double u, uu, v, vv, lv;
@ -109,27 +109,33 @@ colorumax(double* h, double l, double l1, double l2)
} }
lv = (l - l1)/(l2 - l1); /* Remap l to the whole interval 0,1 */ lv = (l - l1)/(l2 - l1); /* Remap l to the whole interval 0,1 */
u = v = 1000000; u = v = 1000000;
for (int k = 0; k < 3; k++) { for (int k = 0; k < 3; k++) {
if (h[k] > 0) { if (h[k] > 0) {
uu = fabs((1-l)/h[k]); uu = fabs((1-l)/h[k]);
vv = fabs((1-lv)/h[k]); vv = fabs((1-lv)/h[k]);
if (uu < u) u = uu;
if (vv < v) v = vv;
if (uu < u) {
u = uu;
}
if (vv < v) {
v = vv;
}
} else if (h[k] < 0) { } else if (h[k] < 0) {
uu = fabs(l/h[k]); uu = fabs(l/h[k]);
vv = fabs(lv/h[k]); vv = fabs(lv/h[k]);
if (uu < u) u = uu; if (uu < u) {
if (vv < v) v = vv; u = uu;
}
if (vv < v) {
v = vv;
}
} }
} }
/* rescale v according to the length of the interval [l1, l2] */ /* rescale v according to the length of the interval [l1, l2] */
v = fabs(l2 - l1) * v; v = fabs(l2 - l1) * v;
/* forces the returned value to be 0 on l1 and l2, trying not to distort colors too much */ /* forces the returned value to be 0 on l1 and l2, trying not to distort colors too much */
return fmin(u, v); return fmin(u, v);
@ -194,62 +200,63 @@ render(zathura_t* zathura, zathura_page_t* page)
- a hue vector, which indicates a radian direction from the grey axis, inside the equal lightness plane. - a hue vector, which indicates a radian direction from the grey axis, inside the equal lightness plane.
- a saturation scalar between 0,1. It is 0 when grey, 1 when the color is in the boundary of the rgb cube. - a saturation scalar between 0,1. It is 0 when grey, 1 when the color is in the boundary of the rgb cube.
*/ */
if (zathura->global.recolor == true) { if (zathura->global.recolor == true) {
/* RGB weights for computing lightness. Must sum to one */ /* RGB weights for computing lightness. Must sum to one */
double a[] = {0.30, 0.59, 0.11}; double a[] = {0.30, 0.59, 0.11};
double l1, l2, l, s, u, t; double l1, l2, l, s, u, t;
double h[3]; double h[3];
double rgb1[3], rgb2[3], rgb[3]; double rgb1[3], rgb2[3], rgb[3];
color2double(&zathura->ui.colors.recolor_dark_color, rgb1); color2double(&zathura->ui.colors.recolor_dark_color, rgb1);
color2double(&zathura->ui.colors.recolor_light_color, rgb2); color2double(&zathura->ui.colors.recolor_light_color, rgb2);
l1 = (a[0]*rgb1[0] + a[1]*rgb1[1] + a[2]*rgb1[2]); l1 = (a[0]*rgb1[0] + a[1]*rgb1[1] + a[2]*rgb1[2]);
l2 = (a[0]*rgb2[0] + a[1]*rgb2[1] + a[2]*rgb2[2]); l2 = (a[0]*rgb2[0] + a[1]*rgb2[1] + a[2]*rgb2[2]);
for (unsigned int y = 0; y < page_height; y++) { for (unsigned int y = 0; y < page_height; y++) {
unsigned char* data = image + y * rowstride; unsigned char* data = image + y * rowstride;
for (unsigned int x = 0; x < page_width; x++) { for (unsigned int x = 0; x < page_width; x++) {
/* Careful. data color components blue, green, red. */ /* Careful. data color components blue, green, red. */
rgb[0] = (double) data[2] / 256.; rgb[0] = (double) data[2] / 256.;
rgb[1] = (double) data[1] / 256.; rgb[1] = (double) data[1] / 256.;
rgb[2] = (double) data[0] / 256.; rgb[2] = (double) data[0] / 256.;
/* compute h, s, l data */
l = a[0]*rgb[0] + a[1]*rgb[1] + a[2]*rgb[2];
h[0] = rgb[0] - l; /* compute h, s, l data */
h[1] = rgb[1] - l; l = a[0]*rgb[0] + a[1]*rgb[1] + a[2]*rgb[2];
h[2] = rgb[2] - l;
/* u is the maximum possible saturation for given h and l. s is a rescaled saturation between 0 and 1 */ h[0] = rgb[0] - l;
u = colorumax(h, l, 0, 1); h[1] = rgb[1] - l;
if (u == 0) s = 0; h[2] = rgb[2] - l;
else s = 1/u;
/* Interpolates lightness between light and dark colors. white goes to light, and black goes to dark. */ /* u is the maximum possible saturation for given h and l. s is a rescaled saturation between 0 and 1 */
u = colorumax(h, l, 0, 1);
if (u == 0) {
s = 0;
} else {
s = 1/u;
}
/* Interpolates lightness between light and dark colors. white goes to light, and black goes to dark. */
t = l; t = l;
l = t * (l2 - l1) + l1; l = t * (l2 - l1) + l1;
if (zathura->global.recolor_keep_hue == true) { if (zathura->global.recolor_keep_hue == true) {
/* adjusting lightness keeping hue of current color. white and black go to grays of same ligtness /* adjusting lightness keeping hue of current color. white and black go to grays of same ligtness
as light and dark colors. */ as light and dark colors. */
u = colorumax(h, l, l1, l2); u = colorumax(h, l, l1, l2);
data[2] = (unsigned char)round(255.*(l + s*u * h[0])); data[2] = (unsigned char)round(255.*(l + s*u * h[0]));
data[1] = (unsigned char)round(255.*(l + s*u * h[1])); data[1] = (unsigned char)round(255.*(l + s*u * h[1]));
data[0] = (unsigned char)round(255.*(l + s*u * h[2])); data[0] = (unsigned char)round(255.*(l + s*u * h[2]));
} else { } else {
/* Linear interpolation between dark and light with color ligtness as a parameter */ /* Linear interpolation between dark and light with color ligtness as a parameter */
data[2] = (unsigned char)round(255.*(t * (rgb2[0] - rgb1[0]) + rgb1[0])); data[2] = (unsigned char)round(255.*(t * (rgb2[0] - rgb1[0]) + rgb1[0]));
data[1] = (unsigned char)round(255.*(t * (rgb2[1] - rgb1[1]) + rgb1[1])); data[1] = (unsigned char)round(255.*(t * (rgb2[1] - rgb1[1]) + rgb1[1]));
data[0] = (unsigned char)round(255.*(t * (rgb2[2] - rgb1[2]) + rgb1[2])); data[0] = (unsigned char)round(255.*(t * (rgb2[2] - rgb1[2]) + rgb1[2]));
} }
data += 4; data += 4;
} }
} }
} }