Use SkMatrix44 for the underlying implementation of ui::Transform

ui/gfx/compositor/compositor_win.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/compositor/compositor.h"
 
 #include <algorithm>
 #include <d3dx10.h>
 #include <vector>
 
@@ skipping 333 matching lines @@
   LoadEffects();
   Resize(last_bounds_);
   InitVertexLayout();
   CreateVertexBuffer();
   CreateIndexBuffer();
 }
 
 void CompositorWin::UpdatePerspective(const ui::Transform& transform,
                                       const gfx::Size& view_size) {
   // Apply transform from view.
-  const SkMatrix& sk_matrix(transform.matrix());
+  const SkMatrix44& m(transform.matrix());
   // Use -1 * kMTransY for y-translation as origin for views is upper left.
   D3DXMATRIX transform_matrix(
-      // row 1
-      sk_matrix[SkMatrix::kMScaleX], sk_matrix[SkMatrix::kMSkewX], 0.0f,
-      sk_matrix[SkMatrix::kMPersp0],
-      // row 2
-      sk_matrix[SkMatrix::kMSkewY], sk_matrix[SkMatrix::kMScaleY], 0.0f,
-      sk_matrix[SkMatrix::kMPersp1],
-      // row 3
-      0.0f, 0.0f, 1.0f, sk_matrix[SkMatrix::kMPersp2],
-      // row 4.
-      sk_matrix[SkMatrix::kMTransX], -sk_matrix[SkMatrix::kMTransY], 0.0f,
-      1.0f);
+      m.get(0,0), m.get(1,0), m.get(2,0), m.get(3,0),

[rjkroege, 2011/06/10 17:52:14]

same comment as the GL case. Is there not a way to construct this without
copying all 16 values?

+      m.get(0,1), m.get(1,1), m.get(2,1), m.get(3,1),
+      m.get(0,2), m.get(1,2), m.get(2,2), m.get(3,2),
+      m.get(0,3), m.get(1,3), m.get(2,3), m.get(3,3));
 
   // Scale so x and y are from 0-2.
   D3DXMATRIX scale_matrix;
   D3DXMatrixScaling(
       &scale_matrix,
       2.0f / static_cast<float>(last_bounds_.width()),
       2.0f / static_cast<float>(last_bounds_.height()),
       1.0f);
 
   // Translate so x and y are from -1,-1 to 1,1.
@@ skipping 446 matching lines @@
 }  // namespace
 
 // static
 Compositor* Compositor::Create(gfx::AcceleratedWidget widget) {
   CompositorWin* compositor = new CompositorWin(widget);
   compositor->Init();
   return compositor;
 }
 
 }  // namespace ui