Use SkMatrix44 for the underlying implementation of ui::Transform

ui/gfx/compositor/compositor_gl.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_gl.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 255 matching lines @@
   t.ConcatScale(1, -1);
 
   t.ConcatTransform(transform);  // Add view transform.
 
   t.ConcatTranslate(0, -window_size.height());
   t.ConcatScale(1, -1);
   t.ConcatTranslate(-window_size.width()/2.0f, -window_size.height()/2.0f);
   t.ConcatScale(2.0f/window_size.width(), 2.0f/window_size.height());
 
   GLfloat m[16];
-  const SkMatrix& matrix = t.matrix();
-
-  // Convert 3x3 view transform matrix (row major) into 4x4 GL matrix (column
-  // major). Assume 2-D rotations/translations restricted to XY plane.
-
-  m[ 0] = matrix[0];
-  m[ 1] = matrix[3];
-  m[ 2] = 0;
-  m[ 3] = matrix[6];
-
-  m[ 4] = matrix[1];
-  m[ 5] = matrix[4];
-  m[ 6] = 0;
-  m[ 7] = matrix[7];
-
-  m[ 8] = 0;
-  m[ 9] = 0;
-  m[10] = 1;
-  m[11] = 0;
-
-  m[12] = matrix[2];
-  m[13] = matrix[5];
-  m[14] = 0;
-  m[15] = matrix[8];
+  t.matrix().asColMajorf(m);
 
   static const GLfloat vertices[] = { -1., -1., +0., +0., +1.,
                                       +1., -1., +0., +1., +1.,
                                       +1., +1., +0., +1., +0.,
                                       -1., +1., +0., +0., +0. };
 
   glVertexAttribPointer(program.a_pos_loc(), 3, GL_FLOAT,
                         GL_FALSE, 5 * sizeof(GLfloat), vertices);
   glVertexAttribPointer(program.a_tex_loc(), 2, GL_FLOAT,
                         GL_FALSE, 5 * sizeof(GLfloat), &vertices[3]);
@@ skipping 98 matching lines @@
   // on this thread long enough to perform the GL bindings.
   // TODO(wjmaclean) Remove this when GL initialisation cleaned up.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (gfx::GLSurface::InitializeOneOff() &&
       gfx::GetGLImplementation() != gfx::kGLImplementationNone)
     return new CompositorGL(widget);
   return NULL;
 }
 
 }  // namespace ui