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cssimagelinear: Avoid computing the length if we know it

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We handlet the common easy cases manually anyway, so don't bother
sqrt()ing the x/y coords in those cases.
This commit is contained in:
Timm Bäder 2019-12-30 09:46:15 +01:00
parent cee8f78c6e
commit 59111d100f
1 changed files with 28 additions and 16 deletions
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44
gtk/gtkcssimagelinear.c
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@ -76,37 +76,43 @@ static void
gtk_css_image_linear_compute_start_point (double angle_in_degrees, gtk_css_image_linear_compute_start_point (double angle_in_degrees,
double width, double width,
double height, double height,
double *x, double *out_x,
double *y) double *out_y,
double *out_length)
{ {
double angle, c, slope, perpendicular; double angle, c, slope, perpendicular;
double x, y, length;
angle = fmod (angle_in_degrees, 360); angle = fmod (angle_in_degrees, 360);
if (angle < 0) if (angle < 0)
angle += 360; angle += 360;
if (angle == 0) if (angle == 0)
{ {
*x = 0; *out_x = 0;
*y = -height; *out_y = -height;
*out_length = height;
return; return;
} }
else if (angle == 90) else if (angle == 90)
{ {
*x = width; *out_x = width;
*y = 0; *out_y = 0;
*out_length = width;
return; return;
} }
else if (angle == 180) else if (angle == 180)
{ {
*x = 0; *out_x = 0;
*y = height; *out_y = height;
*out_length = height;
return; return;
} }
else if (angle == 270) else if (angle == 270)
{ {
*x = -width; *out_x = -width;
*y = 0; *out_y = 0;
*out_length = width;
return; return;
} }
@ -119,12 +125,18 @@ gtk_css_image_linear_compute_start_point (double angle_in_degrees,
width = - width; width = - width;
if (angle < 90 || angle > 270) if (angle < 90 || angle > 270)
height = - height; height = - height;
/* Compute c (of y = mx + c) of perpendicular */ /* Compute c (of y = mx + c) of perpendicular */
c = height - perpendicular * width; c = height - perpendicular * width;
*x = c / (slope - perpendicular); x = c / (slope - perpendicular);
*y = perpendicular * *x + c; y = perpendicular * x + c;
length = sqrt (x * x + y * y);
*out_x = x;
*out_y = y;
*out_length = length;
} }
static void static void
@ -173,9 +185,9 @@ gtk_css_image_linear_snapshot (GtkCssImage *image,
gtk_css_image_linear_compute_start_point (angle, gtk_css_image_linear_compute_start_point (angle,
width, height, width, height,
&x, &y); &x, &y,
&length);
length = sqrt (x * x + y * y);
gtk_css_image_linear_get_start_end (linear, length, &start, &end); gtk_css_image_linear_get_start_end (linear, length, &start, &end);
if (start == end) if (start == end)