Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/toolbar/toolbar_resource_macros.h

+// Copyright 2013 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_RESOURCE_MACROS_H_
+#define IOS_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_RESOURCE_MACROS_H_
+
+#include "ios/chrome/grit/ios_theme_resources.h"
+
+// These macros are used to populate the 3-dimensional array used to map from
+// a button's name/style/state combination to resource ID pointing to the image
+// to be used for the button.
+// Each macro should "produce" a 2x3 entry for a button specified by |name|
+// where style ∈ [light, dark] and state ∈ [normal, pressed, disabled].
+// 0 is used when the resource for a given combination does not exist.
+
+// clang-format off
+#define TOOLBAR_IDR_THREE_STATE(name) \
+  { { IDR_IOS_TOOLBAR_LIGHT_ ## name, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _PRESSED, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _DISABLED }, \
+    { IDR_IOS_TOOLBAR_DARK_ ## name, \
+      IDR_IOS_TOOLBAR_DARK_ ## name ## _PRESSED, \
+      IDR_IOS_TOOLBAR_DARK_ ## name ## _DISABLED } }
+
+#define TOOLBAR_IDR_TWO_STATE(name) \
+  { { IDR_IOS_TOOLBAR_LIGHT_ ## name, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _PRESSED, 0 }, \
+    { IDR_IOS_TOOLBAR_DARK_ ## name, \
+      IDR_IOS_TOOLBAR_DARK_ ## name ## _PRESSED, 0 } }
+
+#define TOOLBAR_IDR_ONE_STATE(name) \
+  { { IDR_IOS_TOOLBAR_LIGHT_ ## name, 0, 0 }, \
+    { IDR_IOS_TOOLBAR_LIGHT_ ## name, 0, 0 } }
+
+#define TOOLBAR_IDR_LIGHT_ONLY_THREE_STATE(name) \
+  { { IDR_IOS_TOOLBAR_LIGHT_ ## name, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _PRESSED, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _DISABLED }, \
+      { 0, 0, 0 } }
+
+#define TOOLBAR_IDR_LIGHT_ONLY_TWO_STATE(name) \
+  { { IDR_IOS_TOOLBAR_LIGHT_ ## name, \
+      IDR_IOS_TOOLBAR_LIGHT_ ## name ## _PRESSED, 0 }, \
+      { 0, 0, 0 } }
+// clang-format on
+
+#endif  // IOS_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_RESOURCE_MACROS_H_