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// Copyright 2016 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 CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_
#define CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#define STATIC_ASSERT_PREVIEWS_ENUM(a, b) \
static_assert(static_cast<int>(a) == static_cast<int>(b), \
"mismatching enums: " #a)
namespace content {
// Chrome Proxy Previews header and directives.
const char kChromeProxyContentTransformHeader[] =
"chrome-proxy-content-transform";
const char kChromeProxyEmptyImageDirective[] = "empty-image";
const char kChromeProxyLitePageDirective[] = "lite-page";
typedef int PreviewsState;
// The Previews types which determines whether to request a Preview version of
// the resource. Previews are optimizations that change the format and
// content of web pages to improve data savings and / or performance. This enum
// determines which Previews types to request.
enum PreviewsTypes {
PREVIEWS_UNSPECIFIED = 0, // Let the browser process decide whether or
// not to request Preview types.
SERVER_LOFI_ON = 1 << 0, // Request a Lo-Fi version of the resource
// from the server.
CLIENT_LOFI_ON = 1 << 1, // Request a Lo-Fi version of the resource
// from the client.
CLIENT_LOFI_AUTO_RELOAD = 1 << 2, // Request the original version of the
// resource after a decoding error occurred
// when attempting to use Client Lo-Fi.
SERVER_LITE_PAGE_ON = 1 << 3, // Request a Lite Page version of the
// resource from the server.
PREVIEWS_NO_TRANSFORM = 1 << 4, // Explicitly forbid Previews
// transformations.
PREVIEWS_OFF = 1 << 5, // Request a normal (non-Preview) version of
// the resource. Server transformations may
// still happen if the page is heavy.
PREVIEWS_STATE_LAST = PREVIEWS_OFF
};
// Ensure that content::PreviewsState and blink::WebURLRequest::PreviewsState
// are kept in sync.
STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_UNSPECIFIED,
blink::WebURLRequest::kPreviewsUnspecified);
STATIC_ASSERT_PREVIEWS_ENUM(SERVER_LOFI_ON,
blink::WebURLRequest::kServerLoFiOn);
STATIC_ASSERT_PREVIEWS_ENUM(CLIENT_LOFI_ON,
blink::WebURLRequest::kClientLoFiOn);
STATIC_ASSERT_PREVIEWS_ENUM(CLIENT_LOFI_AUTO_RELOAD,
blink::WebURLRequest::kClientLoFiAutoReload);
STATIC_ASSERT_PREVIEWS_ENUM(SERVER_LITE_PAGE_ON,
blink::WebURLRequest::kServerLitePageOn);
STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_NO_TRANSFORM,
blink::WebURLRequest::kPreviewsNoTransform);
STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_OFF, blink::WebURLRequest::kPreviewsOff);
STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_STATE_LAST,
blink::WebURLRequest::kPreviewsStateLast);
} // namespace content
#endif // CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_
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