calculate_pitch.h

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// Copyright 2022 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef CORE_FXGE_CALCULATE_PITCH_H_
#define CORE_FXGE_CALCULATE_PITCH_H_
 
#include <stdint.h>
 
#include <optional>
 
namespace fxge {
 
// Returns the bytes between successive rows of an image where rows are aligned
// on a byte boundary and there is no additional padding beyond that, or nullopt
// if the result can not fit in a uint32_t.
std::optional<uint32_t> CalculatePitch8(uint32_t bits_per_component,
                                        uint32_t components_per_pixel,
                                        int width_in_pixels);
 
// Returns the bytes between successive rows of an image where rows are aligned
// on a 32-bit word boundary and there is no additional padding beyond that, or
// nullopt if the result can not fit in a uint32_t.
std::optional<uint32_t> CalculatePitch32(int bits_per_pixel,
                                         int width_in_pixels);
 
// Same as above, but terminate if the result can not fit in a uint32_t.
uint32_t CalculatePitch8OrDie(uint32_t bits_per_component,
                              uint32_t components_per_pixel,
                              int width_in_pixels);
uint32_t CalculatePitch32OrDie(int bits_per_pixel, int width_in_pixels);
 
}  // namespace fxge
 
#endif  // CORE_FXGE_CALCULATE_PITCH_H_