internal unsafe void Initialize(ImageDescription description, IntPtr dataPointer, int offset, GCHandle?handle, bool bufferIsDisposable, PitchFlags pitchFlags = PitchFlags.None)
{
if (!DXGI.FormatHelper.IsValid(description.Format) || DXGI.FormatHelper.IsVideo(description.Format))
{
throw new InvalidOperationException("Unsupported DXGI Format");
}
this.handle = handle;
switch (description.Dimension)
{
case TextureDimension.Texture1D:
if (description.Width <= 0 || description.Height != 1 || description.Depth != 1 || description.ArraySize == 0)
{
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 1D");
}
// Check that miplevels are fine
description.MipLevels = MipMapHelper.CalculateMipLevels(description.Width, 1, description.MipLevels);
break;
case TextureDimension.Texture2D:
case TextureDimension.TextureCube:
if (description.Width <= 0 || description.Height <= 0 || description.Depth != 1 || description.ArraySize == 0)
{
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 2D");
}
if (description.Dimension == TextureDimension.TextureCube)
{
if ((description.ArraySize % 6) != 0)
{
throw new InvalidOperationException("TextureCube must have an arraysize = 6");
}
}
// Check that miplevels are fine
description.MipLevels = MipMapHelper.CalculateMipLevels(description.Width, description.Height, description.MipLevels);
break;
case TextureDimension.Texture3D:
if (description.Width <= 0 || description.Height <= 0 || description.Depth <= 0 || description.ArraySize != 1)
{
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 3D");
}
// Check that miplevels are fine
description.MipLevels = MipMapHelper.CalculateMipLevels(description.Width, description.Height, description.Depth, description.MipLevels);
break;
}
// Calculate mipmaps
int pixelBufferCount;
this.mipMapToZIndex = CalculateImageArray(description, pitchFlags, out pixelBufferCount, out totalSizeInBytes);
this.mipmapDescriptions = CalculateMipMapDescription(description, pitchFlags);
zBufferCountPerArraySlice = this.mipMapToZIndex[this.mipMapToZIndex.Count - 1];
// Allocate all pixel buffers
pixelBuffers = new PixelBuffer[pixelBufferCount];
pixelBufferArray = new PixelBufferArray(this);
// Setup all pointers
// only release buffer that is not pinned and is asked to be disposed.
this.bufferIsDisposable = !handle.HasValue && bufferIsDisposable;
this.buffer = dataPointer;
if (dataPointer == IntPtr.Zero)
{
buffer = Utilities.AllocateMemory(totalSizeInBytes);
offset = 0;
this.bufferIsDisposable = true;
}
SetupImageArray((IntPtr)((byte *)buffer + offset), totalSizeInBytes, description, pitchFlags, pixelBuffers);
Description = description;
// PreCompute databoxes
dataBoxArray = ComputeDataBox();
}
/// <summary>
/// Creates a new instance of <see cref="Image"/> from an image description.
/// </summary>
/// <param name="description">The image description.</param>
/// <returns>A new image.</returns>
public static Image New(ImageDescription description)
{
return(New(description, IntPtr.Zero));
}
/// <summary>
/// Creates a new instance of <see cref="Image"/> from an image description.
/// </summary>
/// <param name="description">The image description.</param>
/// <param name="dataPointer">Pointer to an existing buffer.</param>
/// <returns>A new image.</returns>
public static Image New(ImageDescription description, IntPtr dataPointer)
{
return(new Image(description, dataPointer, 0, null, false));
}
/// <summary>
/// Initializes a new instance of the <see cref="Image" /> class.
/// </summary>
/// <param name="description">The image description.</param>
/// <param name="dataPointer">The pointer to the data buffer.</param>
/// <param name="offset">The offset from the beginning of the data buffer.</param>
/// <param name="handle">The handle (optional).</param>
/// <param name="bufferIsDisposable">if set to <c>true</c> [buffer is disposable].</param>
/// <param name="pitchFlags"></param>
/// <exception cref="System.InvalidOperationException">If the format is invalid, or width/height/depth/arraysize is invalid with respect to the dimension.</exception>
internal unsafe Image(ImageDescription description, IntPtr dataPointer, int offset, GCHandle?handle, bool bufferIsDisposable, PitchFlags pitchFlags = PitchFlags.None)
{
Initialize(description, dataPointer, offset, handle, bufferIsDisposable, pitchFlags);
}