gtk/gdk/gdkdihedral.c
Matthias Clasen b5b58ced2a Add gdk_dihedral_get_name
And use it everywhere we want to print out debug spew about
dihedral transforms.
2024-07-10 22:11:13 +02:00

83 lines
1.7 KiB
C

#include "config.h"
#include "gdkdihedralprivate.h"
void
gdk_dihedral_get_mat2 (GdkDihedral transform,
float *xx,
float *xy,
float *yx,
float *yy)
{
const float mat[8][2][2] = {
[GDK_DIHEDRAL_NORMAL] = {
{ 1.0, 0.0 },
{ 0.0, 1.0 }
},
[GDK_DIHEDRAL_90] = {
{ 0.0, 1.0 },
{ -1.0, 0.0 }
},
[GDK_DIHEDRAL_180] = {
{ -1.0, 0.0 },
{ 0.0, -1.0 }
},
[GDK_DIHEDRAL_270] = {
{ 0.0, -1.0 },
{ 1.0, 0.0 }
},
[GDK_DIHEDRAL_FLIPPED] = {
{ -1.0, 0.0 },
{ 0.0, 1.0 }
},
[GDK_DIHEDRAL_FLIPPED_90] = {
{ 0.0, -1.0 },
{ -1.0, 0.0 }
},
[GDK_DIHEDRAL_FLIPPED_180] = {
{ 1.0, 0.0 },
{ 0.0, -1.0 }
},
[GDK_DIHEDRAL_FLIPPED_270] = {
{ 0.0, 1.0 },
{ 1.0, 0.0 }
},
};
*xx = mat[transform][0][0];
*xy = mat[transform][1][0];
*yx = mat[transform][0][1];
*yy = mat[transform][1][1];
}
GdkDihedral
gdk_dihedral_combine (GdkDihedral first,
GdkDihedral second)
{
return ((first & 4) ^ (second & 4)) |
((((first & 3) * (((second & 4) >> 1) + 1)) + second) & 3);
}
GdkDihedral
gdk_dihedral_invert (GdkDihedral self)
{
return ((4 - self) * (((self & 4) >> 1) + 1) & 3) | (self & 4);
}
gboolean
gdk_dihedral_swaps_xy (GdkDihedral self)
{
return (self & 1) ? TRUE : FALSE;
}
const char *
gdk_dihedral_get_name (GdkDihedral self)
{
const char *name[] = {
"normal", "90", "180", "270", "flipped", "flipped-90", "flipped-180", "flipped-270"
};
return name[self];
}