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Make zoomdiff compare impact on image dimensions 

Before that zoomdiff was a merely heuristic.

Related to issue #303
This commit is contained in:
Bert Münnich 2018-01-22 10:37:06 +01:00
parent 4c294011a9
commit 727939b3e6
1 changed files with 6 additions and 6 deletions
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12
image.c
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@ -39,9 +39,9 @@ enum { DEF_GIF_DELAY = 75 };
float zoom_min;
float zoom_max;
static int zoomdiff(float z1, float z2)
static int zoomdiff(img_t *img, float z)
{
return (int) (z1 * 1000.0 - z2 * 1000.0);
return (int) ((img->w * z - img->w * img->zoom) + (img->h * z - img->h * img->zoom));
}
void img_init(img_t *img, win_t *win)
@ -417,7 +417,7 @@ bool img_fit(img_t *img)
z = MAX(z, zoom_min);
z = MIN(z, zmax);
if (zoomdiff(z, img->zoom) != 0) {
if (zoomdiff(img, z) != 0) {
img->zoom = z;
img->dirty = true;
return true;
@ -539,7 +539,7 @@ bool img_zoom(img_t *img, float z)
img->scalemode = SCALE_ZOOM;
if (zoomdiff(z, img->zoom) != 0) {
if (zoomdiff(img, z) != 0) {
int x, y;
win_cursor_pos(img->win, &x, &y);
@ -565,7 +565,7 @@ bool img_zoom_in(img_t *img)
for (i = 1; i < ARRLEN(zoom_levels); i++) {
z = zoom_levels[i] / 100.0;
if (zoomdiff(z, img->zoom) > 0)
if (zoomdiff(img, z) > 0)
return img_zoom(img, z);
}
return false;
@ -578,7 +578,7 @@ bool img_zoom_out(img_t *img)
for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
z = zoom_levels[i] / 100.0;
if (zoomdiff(z, img->zoom) < 0)
if (zoomdiff(img, z) < 0)
return img_zoom(img, z);
}
return false;