338 lines
13 KiB
C++
338 lines
13 KiB
C++
////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2023 Laurent Gomila (laurent@sfml-dev.org)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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#pragma once
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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics/Export.hpp>
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#include <SFML/Graphics/Color.hpp>
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#include <SFML/Graphics/Rect.hpp>
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#include <filesystem>
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#include <string_view>
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#include <vector>
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namespace sf
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{
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class InputStream;
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////////////////////////////////////////////////////////////
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/// \brief Class for loading, manipulating and saving images
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///
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////////////////////////////////////////////////////////////
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class SFML_GRAPHICS_API Image
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{
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public:
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////////////////////////////////////////////////////////////
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/// \brief Create the image and fill it with a unique color
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///
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/// \param size Width and height of the image
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/// \param color Fill color
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///
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////////////////////////////////////////////////////////////
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void create(const Vector2u& size, const Color& color = Color::Black);
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////////////////////////////////////////////////////////////
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/// \brief Create the image from an array of pixels
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///
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/// The \a pixel array is assumed to contain 32-bits RGBA pixels,
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/// and have the given \a width and \a height. If not, this is
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/// an undefined behavior.
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/// If \a pixels is null, an empty image is created.
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///
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/// \param size Width and height of the image
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/// \param pixels Array of pixels to copy to the image
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///
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////////////////////////////////////////////////////////////
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void create(const Vector2u& size, const std::uint8_t* pixels);
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////////////////////////////////////////////////////////////
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/// \brief Load the image from a file on disk
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///
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/// The supported image formats are bmp, png, tga, jpg, gif,
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/// psd, hdr, pic and pnm. Some format options are not supported,
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/// like jpeg with arithmetic coding or ASCII pnm.
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/// If this function fails, the image is left unchanged.
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///
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/// \param filename Path of the image file to load
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///
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/// \return True if loading was successful
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///
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/// \see loadFromMemory, loadFromStream, saveToFile
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool loadFromFile(const std::filesystem::path& filename);
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////////////////////////////////////////////////////////////
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/// \brief Load the image from a file in memory
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///
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/// The supported image formats are bmp, png, tga, jpg, gif,
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/// psd, hdr, pic and pnm. Some format options are not supported,
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/// like jpeg with arithmetic coding or ASCII pnm.
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/// If this function fails, the image is left unchanged.
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///
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/// \param data Pointer to the file data in memory
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/// \param size Size of the data to load, in bytes
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///
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/// \return True if loading was successful
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///
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/// \see loadFromFile, loadFromStream
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool loadFromMemory(const void* data, std::size_t size);
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////////////////////////////////////////////////////////////
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/// \brief Load the image from a custom stream
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///
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/// The supported image formats are bmp, png, tga, jpg, gif,
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/// psd, hdr, pic and pnm. Some format options are not supported,
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/// like jpeg with arithmetic coding or ASCII pnm.
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/// If this function fails, the image is left unchanged.
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///
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/// \param stream Source stream to read from
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///
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/// \return True if loading was successful
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///
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/// \see loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool loadFromStream(InputStream& stream);
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////////////////////////////////////////////////////////////
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/// \brief Save the image to a file on disk
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///
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/// The format of the image is automatically deduced from
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/// the extension. The supported image formats are bmp, png,
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/// tga and jpg. The destination file is overwritten
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/// if it already exists. This function fails if the image is empty.
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///
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/// \param filename Path of the file to save
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///
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/// \return True if saving was successful
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///
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/// \see create, loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool saveToFile(const std::filesystem::path& filename) const;
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////////////////////////////////////////////////////////////
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/// \brief Save the image to a buffer in memory
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///
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/// The format of the image must be specified.
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/// The supported image formats are bmp, png, tga and jpg.
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/// This function fails if the image is empty, or if
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/// the format was invalid.
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///
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/// \param output Buffer to fill with encoded data
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/// \param format Encoding format to use
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///
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/// \return True if saving was successful
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///
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/// \see create, loadFromFile, loadFromMemory, saveToFile
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool saveToMemory(std::vector<std::uint8_t>& output, std::string_view format) const;
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////////////////////////////////////////////////////////////
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/// \brief Return the size (width and height) of the image
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///
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/// \return Size of the image, in pixels
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///
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////////////////////////////////////////////////////////////
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Vector2u getSize() const;
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////////////////////////////////////////////////////////////
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/// \brief Create a transparency mask from a specified color-key
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///
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/// This function sets the alpha value of every pixel matching
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/// the given color to \a alpha (0 by default), so that they
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/// become transparent.
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///
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/// \param color Color to make transparent
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/// \param alpha Alpha value to assign to transparent pixels
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///
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////////////////////////////////////////////////////////////
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void createMaskFromColor(const Color& color, std::uint8_t alpha = 0);
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////////////////////////////////////////////////////////////
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/// \brief Copy pixels from another image onto this one
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///
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/// This function does a slow pixel copy and should not be
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/// used intensively. It can be used to prepare a complex
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/// static image from several others, but if you need this
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/// kind of feature in real-time you'd better use sf::RenderTexture.
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///
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/// If \a sourceRect is empty, the whole image is copied.
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/// If \a applyAlpha is set to true, alpha blending is
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/// applied from the source pixels to the destination pixels
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/// using the \b over operator. If it is false, the source
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/// pixels are copied unchanged with their alpha value.
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///
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/// See https://en.wikipedia.org/wiki/Alpha_compositing for
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/// details on the \b over operator.
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///
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/// Note that this function can fail if either image is invalid
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/// (i.e. zero-sized width or height), or if \a sourceRect is
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/// not within the boundaries of the \a source parameter, or
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/// if the destination area is out of the boundaries of this image.
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///
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/// On failure, the destination image is left unchanged.
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///
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/// \param source Source image to copy
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/// \param dest Coordinates of the destination position
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/// \param sourceRect Sub-rectangle of the source image to copy
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/// \param applyAlpha Should the copy take into account the source transparency?
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///
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/// \return True if the operation was successful, false otherwise
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///
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////////////////////////////////////////////////////////////
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[[nodiscard]] bool copy(const Image& source,
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const Vector2u& dest,
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const IntRect& sourceRect = IntRect({0, 0}, {0, 0}),
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bool applyAlpha = false);
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////////////////////////////////////////////////////////////
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/// \brief Change the color of a pixel
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///
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/// This function doesn't check the validity of the pixel
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/// coordinates, using out-of-range values will result in
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/// an undefined behavior.
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///
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/// \param coords Coordinates of pixel to change
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/// \param color New color of the pixel
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///
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/// \see getPixel
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///
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////////////////////////////////////////////////////////////
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void setPixel(const Vector2u& coords, const Color& color);
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////////////////////////////////////////////////////////////
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/// \brief Get the color of a pixel
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///
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/// This function doesn't check the validity of the pixel
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/// coordinates, using out-of-range values will result in
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/// an undefined behavior.
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///
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/// \param coords Coordinates of pixel to change
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///
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/// \return Color of the pixel at given coordinates
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///
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/// \see setPixel
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///
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////////////////////////////////////////////////////////////
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Color getPixel(const Vector2u& coords) const;
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////////////////////////////////////////////////////////////
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/// \brief Get a read-only pointer to the array of pixels
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///
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/// The returned value points to an array of RGBA pixels made of
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/// 8 bits integers components. The size of the array is
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/// width * height * 4 (getSize().x * getSize().y * 4).
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/// Warning: the returned pointer may become invalid if you
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/// modify the image, so you should never store it for too long.
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/// If the image is empty, a null pointer is returned.
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///
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/// \return Read-only pointer to the array of pixels
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///
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////////////////////////////////////////////////////////////
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const std::uint8_t* getPixelsPtr() const;
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////////////////////////////////////////////////////////////
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/// \brief Flip the image horizontally (left <-> right)
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///
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////////////////////////////////////////////////////////////
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void flipHorizontally();
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////////////////////////////////////////////////////////////
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/// \brief Flip the image vertically (top <-> bottom)
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///
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////////////////////////////////////////////////////////////
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void flipVertically();
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private:
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////////////////////////////////////////////////////////////
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// Member data
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////////////////////////////////////////////////////////////
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Vector2u m_size; //!< Image size
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std::vector<std::uint8_t> m_pixels; //!< Pixels of the image
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};
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} // namespace sf
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////////////////////////////////////////////////////////////
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/// \class sf::Image
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/// \ingroup graphics
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///
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/// sf::Image is an abstraction to manipulate images
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/// as bidimensional arrays of pixels. The class provides
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/// functions to load, read, write and save pixels, as well
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/// as many other useful functions.
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///
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/// sf::Image can handle a unique internal representation of
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/// pixels, which is RGBA 32 bits. This means that a pixel
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/// must be composed of 8 bits red, green, blue and alpha
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/// channels -- just like a sf::Color.
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/// All the functions that return an array of pixels follow
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/// this rule, and all parameters that you pass to sf::Image
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/// functions (such as loadFromMemory) must use this
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/// representation as well.
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///
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/// A sf::Image can be copied, but it is a heavy resource and
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/// if possible you should always use [const] references to
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/// pass or return them to avoid useless copies.
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///
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/// Usage example:
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/// \code
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/// // Load an image file from a file
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/// sf::Image background;
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/// if (!background.loadFromFile("background.jpg"))
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/// return -1;
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///
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/// // Create a 20x20 image filled with black color
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/// sf::Image image;
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/// image.create({20, 20}, sf::Color::Black);
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///
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/// // Copy background on image at position (10, 10)
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/// if (!image.copy(background, {10, 10}))
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/// return -1;
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///
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/// // Make the top-left pixel transparent
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/// sf::Color color = image.getPixel({0, 0});
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/// color.a = 0;
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/// image.setPixel({0, 0}, color);
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///
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/// // Save the image to a file
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/// if (!image.saveToFile("result.png"))
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/// return -1;
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/// \endcode
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///
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/// \see sf::Texture
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///
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////////////////////////////////////////////////////////////
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