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/* See LICENSE file for copyright and license details. */
#include "common.h"
Zoom zoom = {1.0};
enum zoom_mode zoom_mode = ZOOM_BEST_FIT;
int
zoom_eq(Zoom a, Zoom b)
{
return FLOAT_EQ(a, b);
}
double
get_zoom(Zoom z)
{
return z;
}
Zoom
make_zoom(double s)
{
return s;
}
Zoom
zoom_in(Zoom z)
{
return get_zoom(z) * 1.25;
}
Zoom
zoom_out(Zoom z)
{
return get_zoom(z) * (1.0 / 1.25);
}
Zoom
calculate_fit(struct image *image, int xfit, int yfit, 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 ? MIN(s, y) : 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;
case ZOOM_NORMAL: return calculate_fit(image, 0, 0, 1.0);
case ZOOM_FIT_WIDTH: return calculate_fit(image, 1, 0, HUGE_VAL);
case ZOOM_FIT_HEIGHT: return calculate_fit(image, 0, 1, HUGE_VAL);
case ZOOM_FIT_WINDOW: return calculate_fit(image, 1, 1, HUGE_VAL);
case ZOOM_BEST_FIT: return calculate_fit(image, 1, 1, 1.0);
}
return zoom;
}
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