114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
// Copyright (C) 2020 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Utility module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Utility/Formats/STBLoader.hpp>
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#include <Nazara/Core/CallOnExit.hpp>
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#include <Nazara/Core/Endianness.hpp>
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#include <Nazara/Core/Error.hpp>
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#include <Nazara/Core/Stream.hpp>
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#include <Nazara/Utility/Image.hpp>
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#include <unordered_set>
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#define STB_IMAGE_IMPLEMENTATION
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#include <stb_image.h>
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#include <Nazara/Utility/Debug.hpp>
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namespace Nz
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{
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namespace
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{
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int Eof(void* userdata)
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{
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Stream* stream = static_cast<Stream*>(userdata);
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return stream->GetCursorPos() >= stream->GetSize();
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}
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int Read(void* userdata, char* data, int size)
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{
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Stream* stream = static_cast<Stream*>(userdata);
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return static_cast<int>(stream->Read(data, size));
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}
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void Skip(void* userdata, int size)
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{
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Stream* stream = static_cast<Stream*>(userdata);
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stream->SetCursorPos(static_cast<Int64>(stream->GetCursorPos()) + static_cast<Int64>(size));
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}
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static stbi_io_callbacks callbacks = {Read, Skip, Eof};
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bool IsSupported(const std::string_view& extension)
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{
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static std::unordered_set<std::string_view> supportedExtensions = {"bmp", "gif", "hdr", "jpg", "jpeg", "pic", "png", "ppm", "pgm", "psd", "tga"};
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return supportedExtensions.find(extension) != supportedExtensions.end();
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}
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Ternary Check(Stream& stream, const ImageParams& parameters)
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{
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bool skip;
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if (parameters.custom.GetBooleanParameter("SkipNativeSTBLoader", &skip) && skip)
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return Ternary::False;
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int width, height, bpp;
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if (stbi_info_from_callbacks(&callbacks, &stream, &width, &height, &bpp))
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return Ternary::True;
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else
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return Ternary::False;
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}
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std::shared_ptr<Image> Load(Stream& stream, const ImageParams& parameters)
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{
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// Je charge tout en RGBA8 et je converti ensuite via la méthode Convert
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// Ceci à cause d'un bug de STB lorsqu'il s'agit de charger certaines images (ex: JPG) en "default"
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int width, height, bpp;
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UInt8* ptr = stbi_load_from_callbacks(&callbacks, &stream, &width, &height, &bpp, STBI_rgb_alpha);
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if (!ptr)
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{
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NazaraError("Failed to load image: " + std::string(stbi_failure_reason()));
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return {};
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}
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CallOnExit freeStbiImage([ptr]()
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{
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stbi_image_free(ptr);
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});
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std::shared_ptr<Image> image = std::make_shared<Image>();
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if (!image->Create(ImageType::E2D, PixelFormat::RGBA8, width, height, 1, (parameters.levelCount > 0) ? parameters.levelCount : 1))
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{
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NazaraError("Failed to create image");
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return {};
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}
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image->Update(ptr);
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freeStbiImage.CallAndReset();
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if (parameters.loadFormat != PixelFormat::Undefined)
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{
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if (!image->Convert(parameters.loadFormat))
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{
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NazaraError("Failed to convert image to required format");
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return {};
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}
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}
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return image;
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}
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}
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namespace Loaders
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{
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ImageLoader::Entry GetImageLoader_STB()
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{
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ImageLoader::Entry loaderEntry;
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loaderEntry.extensionSupport = IsSupported;
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loaderEntry.streamChecker = Check;
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loaderEntry.streamLoader = Load;
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return loaderEntry;
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}
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}
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}
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