formats.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * libcamera image formats
 */

#pragma once

#include <array>
#include <vector>

#include <libcamera/geometry.h>
#include <libcamera/pixel_format.h>

#include "libcamera/internal/v4l2_pixelformat.h"

namespace libcamera {

class PixelFormatInfo
{
public:
    enum ColourEncoding {
        ColourEncodingRGB,
        ColourEncodingYUV,
        ColourEncodingRAW,
    };

    struct Plane {
        unsigned int bytesPerGroup;
        unsigned int verticalSubSampling;
    };

    bool isValid() const { return format.isValid(); }

    static const PixelFormatInfo &info(const PixelFormat &format);
    static const PixelFormatInfo &info(const V4L2PixelFormat &format);
    static const PixelFormatInfo &info(const std::string &name);

    unsigned int stride(unsigned int width, unsigned int plane,
                unsigned int align = 1) const;
    unsigned int planeSize(const Size &size, unsigned int plane,
                   unsigned int align = 1) const;
    unsigned int planeSize(unsigned int height, unsigned int plane,
                   unsigned int stride) const;
    unsigned int frameSize(const Size &size, unsigned int align = 1) const;
    unsigned int frameSize(const Size &size,
                   const std::array<unsigned int, 3> &strides) const;

    unsigned int numPlanes() const;

    /* \todo Add support for non-contiguous memory planes */
    const char *name;
    PixelFormat format;
    std::vector<V4L2PixelFormat> v4l2Formats;
    unsigned int bitsPerPixel;
    enum ColourEncoding colourEncoding;
    bool packed;

    unsigned int pixelsPerGroup;

    std::array<Plane, 3> planes;
};

} /* namespace libcamera */