65 lines
3.5 KiB
C#
65 lines
3.5 KiB
C#
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// Copyright (c) 2010-2013 SharpDX - Alexandre Mutel
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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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
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// THE SOFTWARE.
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using SharpDX.Mathematics.Interop;
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namespace SharpDX.Direct2D1
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{
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public static partial class D2D1
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{
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/// <summary>
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/// The default tolerance for geometric flattening operations.
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/// http://msdn.microsoft.com/en-us/library/windows/desktop/dd370975%28v=vs.85%29.aspx
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/// </summary>
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public const float DefaultFlatteningTolerance = 0.25f;
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/// <summary>
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/// The default DPI value.
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/// </summary>
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public const float DefaultDpi = 96f;
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/// <summary>
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/// Computes the appropriate flattening tolerance to pass to APIs that take a flattening tolerance (for instance, <see cref="DeviceContext.CreateFilledGeometryRealization"/>).
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/// </summary>
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/// <param name="matrix">The matrix that will be applied subsequently to the geometry being flattened.</param>
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/// <param name="dpiX">The horizontal DPI of the render target that the geometry will be rendered onto (a choice of 96 implies no DPI correction).</param>
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/// <param name="dpiY">The vertical DPI of the render target that the geometry will be rendered onto (a choice of 96 implies no DPI correction).</param>
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/// <param name="maxZoomFactor">The maximum amount of additional scaling (on top of any scaling implied by the matrix or the DPI) that will be applied to the geometry.</param>
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/// <returns>The flattening tolerance.</returns>
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public static float ComputeFlatteningTolerance(ref RawMatrix3x2 matrix, float dpiX = DefaultDpi, float dpiY = DefaultDpi, float maxZoomFactor = 1f)
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{
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var scaleX = dpiX / DefaultDpi;
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var scaleY = dpiY / DefaultDpi;
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var dpiDependentTransform = new RawMatrix3x2
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{
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M11 = matrix.M11 * scaleX,
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M12 = matrix.M12 * scaleY,
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M21 = matrix.M21 * scaleX,
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M22 = matrix.M22 * scaleY,
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M31 = matrix.M31 * scaleX,
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M32 = matrix.M32 * scaleY
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};
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var absMaxZoomFactor = maxZoomFactor > 0f ? maxZoomFactor : -maxZoomFactor;
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return DefaultFlatteningTolerance / (absMaxZoomFactor * ComputeMaximumScaleFactor(ref dpiDependentTransform));
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}
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}
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}
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