bool
gfxContext::UserToDevicePixelSnapped(gfxPoint& pt, bool ignoreScale) const
{
if (GetFlags() & FLAG_DISABLE_SNAPPING)
return PR_FALSE;
// if we're not at 1.0 scale, don't snap, unless we're
// ignoring the scale. If we're not -just- a scale,
// never snap.
cairo_matrix_t mat;
cairo_get_matrix(mCairo, &mat);
if ((!ignoreScale && (mat.xx != 1.0 || mat.yy != 1.0)) ||
(mat.xy != 0.0 || mat.yx != 0.0))
return PR_FALSE;
pt = UserToDevice(pt);
pt.Round();
return PR_TRUE;
}
bool
gfxContext::UserToDevicePixelSnapped(gfxPoint& pt, bool ignoreScale) const
{
if (mDT->GetUserData(&sDisablePixelSnapping))
return false;
// if we're not at 1.0 scale, don't snap, unless we're
// ignoring the scale. If we're not -just- a scale,
// never snap.
const gfxFloat epsilon = 0.0000001;
#define WITHIN_E(a,b) (fabs((a)-(b)) < epsilon)
Matrix mat = mTransform;
if (!ignoreScale &&
(!WITHIN_E(mat._11,1.0) || !WITHIN_E(mat._22,1.0) ||
!WITHIN_E(mat._12,0.0) || !WITHIN_E(mat._21,0.0)))
return false;
#undef WITHIN_E
pt = UserToDevice(pt);
pt.Round();
return true;
}
