style: Move the animation code of transform into a different file.

Basically, most of the animation code of transform don't need mako, so
we could move them into values/animated/transform.rs.

However, we still use mako to generate some code to make the methods of
Matrix3D simpler, so I still leave them in animated_properties.mako.rs.

Differential Revision: https://phabricator.services.mozilla.com/D11934

components/style/gecko/conversions.rs

@@ -13,9 +13,11 @@ use crate::gecko::values::GeckoStyleCoordConvertible;
 use crate::gecko_bindings::bindings;
 use crate::gecko_bindings::structs::{self, nsStyleCoord_CalcValue};
 use crate::gecko_bindings::structs::{nsStyleImage, nsresult, SheetType};
+use crate::gecko_bindings::structs::RawGeckoGfxMatrix4x4;
 use crate::gecko_bindings::sugar::ns_style_coord::{CoordData, CoordDataMut, CoordDataValue};
 use crate::stylesheets::{Origin, RulesMutateError};
 use crate::values::computed::image::LineDirection;
+use crate::values::computed::transform::Matrix3D;
 use crate::values::computed::url::ComputedImageUrl;
 use crate::values::computed::{Angle, CalcLengthOrPercentage, Gradient, Image};
 use crate::values::computed::{Integer, LengthOrPercentage};
@@ -1142,3 +1144,23 @@ pub unsafe fn string_from_chars_pointer(p: *const u16) -> String {
     let char_vec = slice::from_raw_parts(p, length as usize);
     String::from_utf16_lossy(char_vec)
 }
+
+impl<'a> From< &'a RawGeckoGfxMatrix4x4> for Matrix3D {
+    fn from(m: &'a RawGeckoGfxMatrix4x4) -> Matrix3D {
+        Matrix3D {
+            m11: m[0],  m12: m[1],  m13: m[2],  m14: m[3],
+            m21: m[4],  m22: m[5],  m23: m[6],  m24: m[7],
+            m31: m[8],  m32: m[9],  m33: m[10], m34: m[11],
+            m41: m[12], m42: m[13], m43: m[14], m44: m[15],
+        }
+    }
+}
+
+impl From<Matrix3D> for RawGeckoGfxMatrix4x4 {
+    fn from(matrix: Matrix3D) -> RawGeckoGfxMatrix4x4 {
+        [ matrix.m11, matrix.m12, matrix.m13, matrix.m14,
+          matrix.m21, matrix.m22, matrix.m23, matrix.m24,
+          matrix.m31, matrix.m32, matrix.m33, matrix.m34,
+          matrix.m41, matrix.m42, matrix.m43, matrix.m44 ]
+    }
+}

components/style/values/animated/mod.rs

@@ -14,12 +14,14 @@ use crate::values::computed::length::CalcLengthOrPercentage;
 use crate::values::computed::url::ComputedUrl;
 use crate::values::computed::Angle as ComputedAngle;
 use crate::values::computed::BorderCornerRadius as ComputedBorderCornerRadius;
+use crate::values::CSSFloat;
 use euclid::{Point2D, Size2D};
 use smallvec::SmallVec;
 use std::cmp;
 
 pub mod color;
 pub mod effects;
+pub mod transform;
 mod font;
 mod length;
 mod svg;
@@ -86,6 +88,15 @@ pub fn compare_property_priority(a: &PropertyId, b: &PropertyId) -> cmp::Orderin
         .then_with(|| a.idl_name_sort_order().cmp(&b.idl_name_sort_order()))
 }
 
+/// A helper function to animate two multiplicative factor.
+pub fn animate_multiplicative_factor(
+    this: CSSFloat,
+    other: CSSFloat,
+    procedure: Procedure,
+) -> Result<CSSFloat, ()> {
+    Ok((this - 1.).animate(&(other - 1.), procedure)? + 1.)
+}
+
 /// Animate from one value to another.
 ///
 /// This trait is derivable with `#[derive(Animate)]`. The derived