mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
8 years ago
committed by
GitHub
GitHub
30 changed files with 806 additions and 126 deletions
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using System.Runtime.CompilerServices; |
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using SixLabors.ImageSharp.MetaData; |
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using SixLabors.ImageSharp.MetaData.Profiles.Exif; |
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namespace SixLabors.ImageSharp.Common.Helpers |
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{ |
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/// <summary>
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/// Contains methods for converting values between unit scales.
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/// </summary>
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internal static class UnitConverter |
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{ |
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/// <summary>
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/// The number of centimeters in a meter.
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/// 1 cm is equal to exactly 0.01 meters.
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/// </summary>
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private const double CmsInMeter = 1 / 0.01D; |
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/// <summary>
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/// The number of centimeters in an inch.
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/// 1 inch is equal to exactly 2.54 centimeters.
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/// </summary>
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private const double CmsInInch = 2.54D; |
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/// <summary>
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/// The number of inches in a meter.
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/// 1 inch is equal to exactly 0.0254 meters.
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/// </summary>
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private const double InchesInMeter = 1 / 0.0254D; |
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/// <summary>
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/// Scales the value from centimeters to meters.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double CmToMeter(double x) => x * CmsInMeter; |
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/// <summary>
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/// Scales the value from meters to centimeters.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double MeterToCm(double x) => x / CmsInMeter; |
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/// <summary>
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/// Scales the value from meters to inches.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double MeterToInch(double x) => x / InchesInMeter; |
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/// <summary>
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/// Scales the value from inches to meters.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double InchToMeter(double x) => x * InchesInMeter; |
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/// <summary>
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/// Scales the value from centimeters to inches.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double CmToInch(double x) => x / CmsInInch; |
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/// <summary>
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/// Scales the value from inches to centimeters.
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/// </summary>
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/// <param name="x">The value to scale.</param>
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/// <returns>The <see cref="double"/>.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static double InchToCm(double x) => x * CmsInInch; |
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/// <summary>
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/// Converts an <see cref="ExifTag.ResolutionUnit"/> to a <see cref="PixelResolutionUnit"/>.
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/// </summary>
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/// <param name="profile">The EXIF profile containing the value.</param>
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/// <returns>The <see cref="PixelResolutionUnit"/></returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public static PixelResolutionUnit ExifProfileToResolutionUnit(ExifProfile profile) |
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{ |
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return profile.TryGetValue(ExifTag.ResolutionUnit, out ExifValue resolution) |
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? (PixelResolutionUnit)(byte)(((ushort)resolution.Value) - 1) // EXIF is 1, 2, 3
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: default; |
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} |
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} |
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} |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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namespace SixLabors.ImageSharp.MetaData |
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{ |
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/// <summary>
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/// Provides enumeration of available pixel density units.
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/// </summary>
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public enum PixelResolutionUnit : byte |
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{ |
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/// <summary>
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/// No units; width:height pixel aspect ratio.
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/// </summary>
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AspectRatio = 0, |
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/// <summary>
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/// Pixels per inch (2.54 cm).
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/// </summary>
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PixelsPerInch = 1, |
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/// <summary>
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/// Pixels per centimeter.
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/// </summary>
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PixelsPerCentimeter = 2, |
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/// <summary>
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/// Pixels per meter (100 cm).
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/// </summary>
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PixelsPerMeter = 3 |
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} |
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} |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using SixLabors.ImageSharp.Common.Helpers; |
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using Xunit; |
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namespace SixLabors.ImageSharp.Tests.Helpers |
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{ |
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public class UnitConverterHelperTests |
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{ |
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[Fact] |
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public void InchToFromMeter() |
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{ |
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const double expected = 96D; |
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double actual = UnitConverter.InchToMeter(expected); |
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actual = UnitConverter.MeterToInch(actual); |
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Assert.Equal(expected, actual, 15); |
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} |
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[Fact] |
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public void InchToFromCm() |
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{ |
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const double expected = 96D; |
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double actual = UnitConverter.InchToCm(expected); |
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actual = UnitConverter.CmToInch(actual); |
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Assert.Equal(expected, actual, 15); |
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} |
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[Fact] |
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public void CmToFromMeter() |
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{ |
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const double expected = 96D; |
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double actual = UnitConverter.CmToMeter(expected); |
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actual = UnitConverter.MeterToCm(actual); |
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Assert.Equal(expected, actual, 15); |
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} |
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} |
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} |
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After Width: | Height: | Size: 1.6 KiB |
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After Width: | Height: | Size: 1.6 KiB |
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After Width: | Height: | Size: 34 KiB |
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After Width: | Height: | Size: 404 B |
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After Width: | Height: | Size: 344 B |
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