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/* See LICENSE file for copyright and license details. */
#include "common.h"
Zoom zoom = {1.0, INT_MIN};
enum zoom_mode zoom_mode = ZOOM_BEST_FIT;
const Zoom normal_zoom = {1.0, 0};
int
zoom_eq(Zoom a, Zoom b)
{
return FLOAT_EQ(a.s, b.s);
}
double
get_zoom(Zoom z)
{
return z.s;
}
Zoom
make_zoom(double s)
{
return (Zoom){s, INT_MIN};
}
static Zoom
next_zoom(Zoom z, int dir)
{
double s = z.s;
int i;
if (z.i != INT_MIN) {
i = z.i + dir;
goto have_new;
}
#define LIMIT 70
#define EXPONENT 1.1
s = log(s) / log(EXPONENT);
s = round(s);
i = (int)s;
i += dir;
have_new:
i = i < -LIMIT ? -LIMIT : i > +LIMIT ? +LIMIT : i;
s = (double)i;
s = pow(EXPONENT, s);
return (Zoom){s, i};
#undef LIMIT
#undef EXPONENT
}
Zoom
zoom_in(Zoom z)
{
return next_zoom(z, +1);
}
Zoom
zoom_out(Zoom z)
{
return next_zoom(z, -1);
}
static Zoom
calculate_fit(struct image *image, int xfit, int yfit, int maxfit, double cap)
{
GtkAdjustment *adjustment;
double s = 1.0, y;
if (xfit) {
adjustment = logical_scroll_pane_get_hadjustment(LOGICAL_SCROLL_PANE(scroll));
s = (double)image->width;
s = adjustment->page_size / s;
}
if (yfit) {
adjustment = logical_scroll_pane_get_vadjustment(LOGICAL_SCROLL_PANE(scroll));
y = (double)image->height;
y = adjustment->page_size / y;
s = !xfit ? y : maxfit ? MAX(s, y) : MIN(s, y);
}
if (s > cap)
s = cap;
return make_zoom(s);
}
Zoom
calculate_zoom_mode(struct image *image, enum zoom_mode mode)
{
switch (mode) {
case ZOOM_CUSTOM:
break;
#define X(E, A, O, T, ...) case E: return calculate_fit(image, __VA_ARGS__)
LIST_ZOOM_MODES(X, ;);
#undef X
}
return zoom;
}
int
parse_and_set_zoom_mode(const char *s)
{
double a, b, scale;
char *p;
#define X(E, A, OPT, ...)\
if (!strcasecmp(s, OPT)) {\
zoom_mode = E;\
return 1;\
}
LIST_ZOOM_MODES(X,);
#undef X
errno = 0;
if (isspace(*s)) return 0;
a = strtod(s, &p);
if (a <= 0.0 || errno) return 0;
while (*p == ' ') p++;
if (*p == '%') {
if (*++p) return 0;
scale = 0.01 * a;
} else if (*p == ':') {
while (*++p == ' ');
if (isspace(*p)) return 0;
b = strtod(p, &p);
if (b <= 0.0 || errno) return 0;
scale = a / b;
if (*p) return 0;
} else {
return 0;
}
if (!isfinite(scale) && scale <= 0.0)
return 0;
zoom_mode = ZOOM_CUSTOM;
zoom = make_zoom(scale);
return 1;
}
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