chromium/cc/tiles/mipmap_util.cc

// Copyright 2016 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/tiles/mipmap_util.h"

#include <algorithm>
#include <limits>

#include "base/numerics/safe_math.h"

namespace cc {
namespace {
// Calculates the size of |axis_base_size| at the given |mip_level|. Note that
// the calculation here rounds up for consistency with size calculations in the
// JPEG decoder. This allows us to decode images to the mip size directly.
int ScaleAxisToMipLevel(int axis_base_size, int mip_level) { … }

}  // namespace

int MipMapUtil::GetLevelForSize(const gfx::Size& src_size,
                                const gfx::Size& target_size) { … }

SkSize MipMapUtil::GetScaleAdjustmentForLevel(const gfx::Size& src_size,
                                              int mip_level) { … }

gfx::Size MipMapUtil::GetSizeForLevel(const gfx::Size& src_size,
                                      int mip_level) { … }

SkSize MipMapUtil::GetScaleAdjustmentForSize(const gfx::Size& src_size,
                                             const gfx::Size& target_size) { … }

}  // namespace cc