Program Listing for File slint_image.h

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// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial

#pragma once
#include <string_view>
#include "slint_generated_public.h"
#include "slint_size.h"
#include "slint_image_internal.h"
#include "slint_string.h"
#include "slint_sharedvector.h"

namespace slint {

template<typename Pixel>
struct SharedPixelBuffer
{
    SharedPixelBuffer() = default;

    SharedPixelBuffer(uint32_t width, uint32_t height)
        : m_width(width), m_height(height), m_data(width * height)
    {
    }

    SharedPixelBuffer(uint32_t width, uint32_t height, const Pixel *data)
        : m_width(width), m_height(height), m_data(data, data + (width * height))
    {
    }

    uint32_t width() const { return m_width; }
    uint32_t height() const { return m_height; }

    const Pixel *begin() const { return m_data.begin(); }
    const Pixel *end() const { return m_data.end(); }
    Pixel *begin() { return m_data.begin(); }
    Pixel *end() { return m_data.end(); }
    const Pixel *cbegin() const { return m_data.begin(); }
    const Pixel *cend() const { return m_data.end(); }

    bool operator==(const SharedPixelBuffer &other) const = default;

private:
    friend struct Image;
    uint32_t m_width;
    uint32_t m_height;
    SharedVector<Pixel> m_data;
};

struct Image
{
public:
    Image() : data(Data::ImageInner_None()) { }

    static Image load_from_path(const SharedString &file_path)
    {
        Image img;
        cbindgen_private::types::slint_image_load_from_path(&file_path, &img.data);
        return img;
    }

    Image(SharedPixelBuffer<Rgb8Pixel> buffer)
        : data(Data::ImageInner_EmbeddedImage(
                cbindgen_private::types::ImageCacheKey::Invalid(),
                cbindgen_private::types::SharedImageBuffer::RGB8(
                        cbindgen_private::types::SharedPixelBuffer<Rgb8Pixel> {
                                .width = buffer.width(),
                                .height = buffer.height(),
                                .data = buffer.m_data })))
    {
    }

    Image(SharedPixelBuffer<Rgba8Pixel> buffer)
        : data(Data::ImageInner_EmbeddedImage(
                cbindgen_private::types::ImageCacheKey::Invalid(),
                cbindgen_private::types::SharedImageBuffer::RGBA8(
                        cbindgen_private::types::SharedPixelBuffer<Rgba8Pixel> {
                                .width = buffer.width(),
                                .height = buffer.height(),
                                .data = buffer.m_data })))
    {
    }

    Size<unsigned int> size() const { return cbindgen_private::types::slint_image_size(&data); }

    std::optional<slint::SharedString> path() const
    {
        if (auto *str = cbindgen_private::types::slint_image_path(&data)) {
            return *str;
        } else {
            return {};
        }
    }

    friend bool operator==(const Image &a, const Image &b) { return a.data == b.data; }
    friend bool operator!=(const Image &a, const Image &b) { return a.data != b.data; }

    explicit Image(cbindgen_private::types::Image inner) : data(inner) { }

private:
    using Tag = cbindgen_private::types::ImageInner::Tag;
    using Data = cbindgen_private::types::Image;
    Data data;
};

namespace private_api {
inline Image load_image_from_embedded_data(std::span<const uint8_t> data,
                                           std::string_view extension)
{
    cbindgen_private::types::Image img(cbindgen_private::types::Image::ImageInner_None());
    cbindgen_private::types::slint_image_load_from_embedded_data(
            slint::cbindgen_private::Slice<uint8_t> { const_cast<uint8_t *>(data.data()),
                                                      data.size() },
            slint::cbindgen_private::Slice<uint8_t> {
                    const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(extension.data())),
                    extension.size() },
            &img);
    return Image(img);
}

inline Image image_from_embedded_textures(const cbindgen_private::types::StaticTextures *textures)
{
    cbindgen_private::types::Image img(cbindgen_private::types::Image::ImageInner_None());
    cbindgen_private::types::slint_image_from_embedded_textures(textures, &img);
    return Image(img);
}
}

}