d6c292a2cc
https://github.com/Robmaister/SharpFont TODO: replace Code Bold.otf with the full version, fix any bugs, build on Linux, possibly move ToolBox string wrapping and limiting logic to ScalableFont class for better results.
79 lines
3.3 KiB
C#
79 lines
3.3 KiB
C#
#region MIT License
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/*Copyright (c) 2012-2013, 2015 Robert Rouhani <robert.rouhani@gmail.com>
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SharpFont based on Tao.FreeType, Copyright (c) 2003-2007 Tao Framework Team
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.*/
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#endregion
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using System;
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using System.Runtime.InteropServices;
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namespace SharpFont
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{
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/// <summary>
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/// Helpful methods to make marshalling simpler.
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/// </summary>
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internal static class PInvokeHelper
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{
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/// <summary>
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/// A generic wrapper for <see cref="Marshal.PtrToStructure(IntPtr, Type)"/>.
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/// </summary>
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/// <typeparam name="T">The type to cast to.</typeparam>
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/// <param name="reference">The pointer that holds the struct.</param>
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/// <returns>A marshalled struct.</returns>
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internal static T PtrToStructure<T>(IntPtr reference)
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{
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return (T)Marshal.PtrToStructure(reference, typeof(T));
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}
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/// <summary>
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/// A method to copy data from one pointer to another, byte by byte.
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/// </summary>
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/// <param name="source">The source pointer.</param>
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/// <param name="sourceOffset">An offset into the source buffer.</param>
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/// <param name="destination">The destination pointer.</param>
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/// <param name="destinationOffset">An offset into the destination buffer.</param>
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/// <param name="count">The number of bytes to copy.</param>
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internal static unsafe void Copy(IntPtr source, int sourceOffset, IntPtr destination, int destinationOffset, int count)
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{
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byte* src = (byte*)source + sourceOffset;
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byte* dst = (byte*)destination + destinationOffset;
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byte* end = dst + count;
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while (dst != end)
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*dst++ = *src++;
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}
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/// <summary>
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/// A common pattern in SharpFont is to pass a pointer to a memory address inside of a struct. This method
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/// works for all cases and provides a generic API.
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/// </summary>
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/// <see cref="Marshal.OffsetOf"/>
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/// <typeparam name="T">The type of the struct to take an offset from.</typeparam>
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/// <param name="start">A pointer to the start of a struct.</param>
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/// <param name="fieldName">The name of the field to get an offset to.</param>
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/// <returns><code>start</code> + the offset of the <code>fieldName</code> field in <code>T</code>.</returns>
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internal static IntPtr AbsoluteOffsetOf<T>(IntPtr start, string fieldName)
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{
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return new IntPtr(start.ToInt64() + Marshal.OffsetOf(typeof(T), fieldName).ToInt64());
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}
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}
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}
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