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app: avoid expensive rotated scale calculation when scale_x == scale_y

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Ditto for the rulers' resolution calculation.
This commit is contained in:
Ell
2016-08-09 22:25:54 +00:00
parent 5663daa6e7
commit 26b978d2a8
2 changed files with 19 additions and 10 deletions
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27
app/display/gimpdisplayshell-rulers.c
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@ -69,7 +69,6 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
{
gint image_x, image_y;
gdouble res_x, res_y;
gdouble cos_a, sin_a;
gimp_display_shell_scale_get_image_bounds (shell,
&image_x, &image_y,
@ -85,18 +84,28 @@ gimp_display_shell_rulers_update (GimpDisplayShell *shell)
gimp_image_get_resolution (image, &res_x, &res_y);
cos_a = cos (G_PI * shell->rotate_angle / 180.0);
sin_a = sin (G_PI * shell->rotate_angle / 180.0);
if (shell->dot_for_dot)
if (shell->rotate_angle == 0.0 || res_x == res_y)
{
resolution_x = 1.0 / sqrt (SQR (cos_a / res_x) + SQR (sin_a / res_y));
resolution_y = 1.0 / sqrt (SQR (cos_a / res_y) + SQR (sin_a / res_x));
resolution_x = res_x;
resolution_y = res_y;
}
else
{
resolution_x = sqrt (SQR (res_x * cos_a) + SQR (res_y * sin_a));
resolution_y = sqrt (SQR (res_y * cos_a) + SQR (res_x * sin_a));
gdouble cos_a = cos (G_PI * shell->rotate_angle / 180.0);
gdouble sin_a = sin (G_PI * shell->rotate_angle / 180.0);
if (shell->dot_for_dot)
{
resolution_x = 1.0 / sqrt (SQR (cos_a / res_x) +
SQR (sin_a / res_y));
resolution_y = 1.0 / sqrt (SQR (cos_a / res_y) +
SQR (sin_a / res_x));
}
else
{
resolution_x = sqrt (SQR (res_x * cos_a) + SQR (res_y * sin_a));
resolution_y = sqrt (SQR (res_y * cos_a) + SQR (res_x * sin_a));
}
}
}
else