private static unsafe void SaveDdsFile(
Surface surface,
DdsFileFormat format,
DdsErrorMetric errorMetric,
BC7CompressionMode compressionMode,
bool generateMipmaps,
MipMapSampling mipMapSampling,
DdsWriteImageCallback writeImageCallback,
DdsProgressCallback progressCallback)
{
DDSSaveInfo info = new DDSSaveInfo
{
width = surface.Width,
height = surface.Height,
stride = surface.Stride,
format = format,
errorMetric = errorMetric,
compressionMode = compressionMode,
generateMipmaps = generateMipmaps,
mipmapSampling = mipMapSampling,
scan0 = surface.Scan0.Pointer
};
int hr;
if (IntPtr.Size == 8)
{
hr = DdsIO_x64.Save(ref info, writeImageCallback, progressCallback);
}
else
{
hr = DdsIO_x86.Save(ref info, writeImageCallback, progressCallback);
}
if (FAILED(hr))
{
Marshal.ThrowExceptionForHR(hr);
}
}
internal static unsafe extern int Save(
[In] ref DDSSaveInfo input,
[In, MarshalAs(UnmanagedType.FunctionPtr)] DdsWriteImageCallback writeImageCallback,
[In, MarshalAs(UnmanagedType.FunctionPtr)] DdsProgressCallback progressCallback);
public static unsafe void Save(
Document input,
Stream output,
DdsFileFormat format,
DdsErrorMetric errorMetric,
BC7CompressionMode compressionMode,
bool generateMipmaps,
MipMapSampling sampling,
Surface scratchSurface,
ProgressEventHandler progressCallback)
{
using (RenderArgs args = new RenderArgs(scratchSurface))
{
input.Render(args, true);
}
DdsWriteImageCallback ddsWriteImage = delegate(IntPtr image, UIntPtr imageSize)
{
ulong size = imageSize.ToUInt64();
if (image != IntPtr.Zero && size > 0)
{
const int MaxBufferSize = 65536;
ulong streamBufferSize = Math.Min(MaxBufferSize, size);
byte[] streamBuffer = new byte[streamBufferSize];
output.SetLength(checked ((long)size));
ulong offset = 0;
ulong remaining = size;
fixed(byte *destPtr = streamBuffer)
{
byte *srcPtr = (byte *)image.ToPointer();
while (remaining > 0)
{
ulong copySize = Math.Min(MaxBufferSize, remaining);
Buffer.MemoryCopy(srcPtr + offset, destPtr, streamBufferSize, copySize);
output.Write(streamBuffer, 0, (int)copySize);
offset += copySize;
remaining -= copySize;
}
}
}
};
DdsProgressCallback ddsProgress = delegate(UIntPtr done, UIntPtr total)
{
double progress = (double)done.ToUInt64() / (double)total.ToUInt64();
progressCallback(null, new ProgressEventArgs(progress * 100.0, true));
};
SaveDdsFile(scratchSurface, format, errorMetric, compressionMode, generateMipmaps, sampling, ddsWriteImage, ddsProgress);
GC.KeepAlive(ddsWriteImage);
}
