Implement accessibility support for CSS-transformed iframes.

ui/gfx/ipc/gfx_param_traits.cc

 // Copyright 2014 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/ipc/gfx_param_traits.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/scroll_offset.h"
 #include "ui/gfx/range/range.h"
+#include "ui/gfx/transform.h"
 
 #if defined(OS_MACOSX)
 #include "ipc/mach_port_mac.h"
 #endif
 
 namespace {
 
 struct SkBitmap_Data {
   // The color type for the bitmap (bits per pixel, etc).
   SkColorType fColorType;
@@ skipping 328 matching lines @@
 }
 
 void ParamTraits<gfx::ScrollOffset>::Log(const param_type& p, std::string* l) {
   l->append("(");
   LogParam(p.x(), l);
   l->append(", ");
   LogParam(p.y(), l);
   l->append(")");
 }
 
+void ParamTraits<gfx::Transform>::Write(base::Pickle* m, const param_type& p) {
+#ifdef SK_MSCALAR_IS_FLOAT
+  float column_major_data[16];
+  p.matrix().asColMajorf(column_major_data);
+#else
+  double column_major_data[16];
+  p.matrix().asColMajord(column_major_data);
+#endif
+  m->WriteBytes(&column_major_data, sizeof(SkMScalar) * 16);

[dcheng, 2016/03/08 00:39:42]

I know you're just moving this, but mind adding a comment that we do this in one
Write() call for perf reasons
(https://chromium.googlesource.com/chromium/src/+/cc2141401d3ec9865eda78913a01...

Otherwise, everytime I see this and forget the context, I will wonder why we do
this instead of calling, say WriteParam() on the individual elements.

[dmazzoni, 2016/03/16 21:38:14]

Done.

+}
+
+bool ParamTraits<gfx::Transform>::Read(const base::Pickle* m,
+                                       base::PickleIterator* iter,
+                                       param_type* r) {
+  const char* column_major_data;
+  if (!iter->ReadBytes(&column_major_data, sizeof(SkMScalar) * 16))
+    return false;
+  r->matrix().setColMajor(
+      reinterpret_cast<const SkMScalar*>(column_major_data));
+  return true;
+}
+
+void ParamTraits<gfx::Transform>::Log(
+    const param_type& p, std::string* l) {
+#ifdef SK_MSCALAR_IS_FLOAT
+  float row_major_data[16];
+  p.matrix().asRowMajorf(row_major_data);
+#else
+  double row_major_data[16];
+  p.matrix().asRowMajord(row_major_data);
+#endif
+  l->append("(");
+  for (int i = 0; i < 16; ++i) {
+    if (i > 0)
+      l->append(", ");
+    LogParam(row_major_data[i], l);
+  }
+  l->append(") ");
+}
+
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 void ParamTraits<gfx::ScopedRefCountedIOSurfaceMachPort>::Write(
     base::Pickle* m,
     const param_type p) {
   MachPortMac mach_port_mac(p.get());
   ParamTraits<MachPortMac>::Write(m, mach_port_mac);
 }
 
 bool ParamTraits<gfx::ScopedRefCountedIOSurfaceMachPort>::Read(
     const base::Pickle* m,
@@ skipping 29 matching lines @@
 #undef UI_GFX_IPC_GFX_PARAM_TRAITS_MACROS_H_
 #include "ui/gfx/ipc/gfx_param_traits_macros.h"
 }  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
 namespace IPC {
 #undef UI_GFX_IPC_GFX_PARAM_TRAITS_MACROS_H_
 #include "ui/gfx/ipc/gfx_param_traits_macros.h"
 }  // namespace IPC