Initial community commit

Src/external_dependencies/openmpt-trunk/mptrack/Image.h

@@ -0,0 +1,137 @@
+/*
+ * Image.h
+ * -------
+ * Purpose: Bitmap and Vector image file handling.
+ * Notes  : (currently none)
+ * Authors: OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+
+#pragma once
+
+#include "openmpt/all/BuildSettings.hpp"
+
+#include "../common/FileReaderFwd.h"
+
+// GDI+
+namespace Gdiplus {
+#include <gdipluspixelformats.h>
+class Image;
+class Bitmap;
+class Metafile;
+}
+
+
+OPENMPT_NAMESPACE_BEGIN
+
+
+class bad_image : public std::runtime_error { public: bad_image() : std::runtime_error("") { } };
+
+
+class RawGDIDIB
+{
+public:
+	struct Pixel
+	{
+		// Component order must be compatible with Microsoft DIBs!
+		uint8 b;
+		uint8 g;
+		uint8 r;
+		uint8 a;
+		constexpr Pixel() noexcept
+		    : b(0), g(0), r(0), a(0) {}
+		constexpr Pixel(uint8 r, uint8 g, uint8 b, uint8 a) noexcept
+		    : b(b), g(g), r(r), a(a) {}
+		constexpr Pixel(COLORREF color) noexcept
+		    : b(GetBValue(color)), g(GetGValue(color)), r(GetRValue(color)), a(0) {}
+	};
+private:
+	uint32 width;
+	uint32 height;
+	std::vector<Pixel> pixels;
+public:
+	RawGDIDIB(uint32 width, uint32 height);
+public:
+	constexpr uint32 Width() const noexcept { return width; }
+	constexpr uint32 Height() const noexcept { return height; }
+	MPT_FORCEINLINE Pixel &operator()(uint32 x, uint32 y) noexcept { return pixels[y * width + x]; }
+	MPT_FORCEINLINE const Pixel &operator()(uint32 x, uint32 y) const noexcept { return pixels[y * width + x]; }
+	std::vector<Pixel> &Pixels() { return pixels; }
+	const std::vector<Pixel> &Pixels() const { return pixels; }
+};
+
+
+class GdiplusRAII
+{
+private:
+	ULONG_PTR gdiplusToken = 0;
+public:
+	GdiplusRAII();
+	~GdiplusRAII();
+};
+
+
+namespace GDIP
+{
+
+	std::unique_ptr<Gdiplus::Bitmap> LoadPixelImage(mpt::const_byte_span file);
+	std::unique_ptr<Gdiplus::Bitmap> LoadPixelImage(FileReader file);
+
+	std::unique_ptr<Gdiplus::Metafile> LoadVectorImage(mpt::const_byte_span file);
+	std::unique_ptr<Gdiplus::Metafile> LoadVectorImage(FileReader file);
+
+	std::unique_ptr<Gdiplus::Image> ResizeImage(Gdiplus::Image &src, double scaling, int spriteWidth = 0, int spriteHeight = 0);
+	std::unique_ptr<Gdiplus::Bitmap> ResizeImage(Gdiplus::Bitmap &src, double scaling, int spriteWidth = 0, int spriteHeight = 0);
+
+	using Pixel = Gdiplus::ARGB;
+
+	template <typename TBitmapData>
+	inline Pixel * GetScanline(const TBitmapData &bitmapData, std::size_t y) noexcept
+	{
+		if(bitmapData.Stride >= 0)
+		{
+			return reinterpret_cast<Pixel*>(mpt::void_cast<void*>(mpt::void_cast<std::byte*>(bitmapData.Scan0) + y * bitmapData.Stride));
+		} else
+		{
+			return reinterpret_cast<Pixel*>(mpt::void_cast<void*>(mpt::void_cast<std::byte*>(bitmapData.Scan0) + (bitmapData.Height - 1 - y) * (-bitmapData.Stride)));
+		}
+	}
+
+	constexpr Pixel AsPixel(uint8 r, uint8 g, uint8 b, uint8 a) noexcept
+	{
+		return Pixel(0)
+			| (static_cast<Pixel>(r) << RED_SHIFT)
+			| (static_cast<Pixel>(g) << GREEN_SHIFT)
+			| (static_cast<Pixel>(b) << BLUE_SHIFT)
+			| (static_cast<Pixel>(a) << ALPHA_SHIFT)
+			;
+	}
+
+	constexpr uint8 R(Pixel p) noexcept { return static_cast<uint8>(p >> RED_SHIFT); }
+	constexpr uint8 G(Pixel p) noexcept { return static_cast<uint8>(p >> GREEN_SHIFT); }
+	constexpr uint8 B(Pixel p) noexcept { return static_cast<uint8>(p >> BLUE_SHIFT); }
+	constexpr uint8 A(Pixel p) noexcept { return static_cast<uint8>(p >> ALPHA_SHIFT); }
+
+	constexpr RawGDIDIB::Pixel ToRawGDIDIB(Pixel p) noexcept
+	{
+		return RawGDIDIB::Pixel(GDIP::R(p), GDIP::G(p), GDIP::B(p), GDIP::A(p));
+	}
+
+} // namespace GDIP
+
+
+std::unique_ptr<RawGDIDIB> ToRawGDIDIB(Gdiplus::Bitmap &bitmap);
+
+bool CopyToCompatibleBitmap(CBitmap &dst, CDC &dc, const RawGDIDIB &src);
+
+bool CopyToCompatibleBitmap(CBitmap &dst, CDC &dc, Gdiplus::Image &src);
+
+std::unique_ptr<RawGDIDIB> LoadPixelImage(mpt::const_byte_span file, double scaling = 1.0, int spriteWidth = 0, int spriteHeight = 0);
+std::unique_ptr<RawGDIDIB> LoadPixelImage(FileReader file, double scaling = 1.0, int spriteWidth = 0, int spriteHeight = 0);
+
+bool LoadCompatibleBitmapFromPixelImage(CBitmap &dst, CDC &dc, mpt::const_byte_span file);
+bool LoadCompatibleBitmapFromPixelImage(CBitmap &dst, CDC &dc, FileReader file);
+
+
+OPENMPT_NAMESPACE_END