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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/trees/mobile_optimized_viewport_util.h"
#include "base/feature_list.h"
#include "cc/base/features.h"
#include "ui/gfx/geometry/size_f.h"
namespace cc {
namespace util {
namespace {
// Used to accommodate finite precision when comparing scaled viewport and
// content widths. While this value may seem large, width=device-width on an N7
// V1 saw errors of ~0.065 between computed window and content widths.
const float kMobileViewportWidthEpsilon = 0.15f;
} // namespace
bool IsMobileOptimized(float min_page_scale_factor,
float max_page_scale_factor,
float current_page_scale_factor,
gfx::SizeF scrollable_viewport_size,
gfx::SizeF scrollable_size,
bool viewport_meta_mobile_optimized) {
bool has_fixed_page_scale = min_page_scale_factor == max_page_scale_factor;
float window_width_dip =
current_page_scale_factor * scrollable_viewport_size.width();
float content_width_css = scrollable_size.width();
bool has_mobile_viewport =
content_width_css <= window_width_dip + kMobileViewportWidthEpsilon;
return has_mobile_viewport || has_fixed_page_scale ||
viewport_meta_mobile_optimized;
}
} // namespace util
} // namespace cc
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