protected override bool TryCopyFrom(BitmapContent sourceBitmap, Rectangle sourceRegion, Rectangle destinationRegion)
{
SurfaceFormat sourceFormat;
if (!sourceBitmap.TryGetFormat(out sourceFormat))
{
return(false);
}
SurfaceFormat format;
TryGetFormat(out format);
// A shortcut for copying the entire bitmap to another bitmap of the same type and format
if (format == sourceFormat && (sourceRegion == new Rectangle(0, 0, Width, Height)) && sourceRegion == destinationRegion)
{
SetPixelData(sourceBitmap.GetPixelData());
return(true);
}
// TODO: Add a XNA unit test to see what it does
// my guess is that this is invalid for DXT.
//
// Destination region copy is not yet supported
if (destinationRegion != new Rectangle(0, 0, Width, Height))
{
return(false);
}
// If the source is not Vector4 or requires resizing, send it through BitmapContent.Copy
if (!(sourceBitmap is PixelBitmapContent <Vector4>) || sourceRegion.Width != destinationRegion.Width || sourceRegion.Height != destinationRegion.Height)
{
try
{
BitmapContent.Copy(sourceBitmap, sourceRegion, this, destinationRegion);
return(true);
}
catch (InvalidOperationException)
{
return(false);
}
}
// NVTT wants 8bit data in BGRA format.
var colorBitmap = new PixelBitmapContent <Color>(sourceBitmap.Width, sourceBitmap.Height);
BitmapContent.Copy(sourceBitmap, colorBitmap);
var sourceData = colorBitmap.GetPixelData();
var dataHandle = GCHandle.Alloc(sourceData, GCHandleType.Pinned);
AlphaMode alphaMode;
Format outputFormat;
var alphaDither = false;
switch (format)
{
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1SRgb:
{
bool hasTransparency;
PrepareNVTT_DXT1(sourceData, out hasTransparency);
outputFormat = hasTransparency ? Format.DXT1a : Format.DXT1;
alphaMode = hasTransparency ? AlphaMode.Transparency : AlphaMode.None;
alphaDither = true;
break;
}
case SurfaceFormat.Dxt3:
case SurfaceFormat.Dxt3SRgb:
{
PrepareNVTT(sourceData);
outputFormat = Format.DXT3;
alphaMode = AlphaMode.Transparency;
break;
}
case SurfaceFormat.Dxt5:
case SurfaceFormat.Dxt5SRgb:
{
PrepareNVTT(sourceData);
outputFormat = Format.DXT5;
alphaMode = AlphaMode.Transparency;
break;
}
default:
throw new InvalidOperationException("Invalid DXT surface format!");
}
// Do all the calls to the NVTT wrapper within this handler
// so we properly clean up if things blow up.
try
{
var dataPtr = dataHandle.AddrOfPinnedObject();
var inputOptions = new InputOptions();
inputOptions.SetTextureLayout(TextureType.Texture2D, colorBitmap.Width, colorBitmap.Height, 1);
inputOptions.SetMipmapData(dataPtr, colorBitmap.Width, colorBitmap.Height, 1, 0, 0);
inputOptions.SetMipmapGeneration(false);
inputOptions.SetGamma(1.0f, 1.0f);
inputOptions.SetAlphaMode(alphaMode);
var compressionOptions = new CompressionOptions();
compressionOptions.SetFormat(outputFormat);
compressionOptions.SetQuality(Quality.Normal);
// TODO: This isn't working which keeps us from getting the
// same alpha dither behavior on DXT1 as XNA.
//
// See https://github.com/MonoGame/MonoGame/issues/6259
//
//if (alphaDither)
//compressionOptions.SetQuantization(false, false, true);
var outputOptions = new OutputOptions();
outputOptions.SetOutputHeader(false);
outputOptions.SetOutputOptionsOutputHandler(NvttBeginImage, NvttWriteImage, NvttEndImage);
var dxtCompressor = new Compressor();
dxtCompressor.Compress(inputOptions, compressionOptions, outputOptions);
}
finally
{
dataHandle.Free();
}
return(true);
}
protected override bool TryCopyFrom(BitmapContent sourceBitmap, Rectangle sourceRegion, Rectangle destinationRegion)
{
SurfaceFormat sourceFormat;
if (!sourceBitmap.TryGetFormat(out sourceFormat))
{
return(false);
}
SurfaceFormat format;
TryGetFormat(out format);
// A shortcut for copying the entire bitmap to another bitmap of the same type and format
if (format == sourceFormat && (sourceRegion == new Rectangle(0, 0, Width, Height)) && sourceRegion == destinationRegion)
{
SetPixelData(sourceBitmap.GetPixelData());
return(true);
}
// Destination region copy is not yet supported
if (destinationRegion != new Rectangle(0, 0, Width, Height))
{
return(false);
}
// If the source is not Vector4 or requires resizing, send it through BitmapContent.Copy
if (!(sourceBitmap is PixelBitmapContent <Vector4>) || sourceRegion.Width != destinationRegion.Width || sourceRegion.Height != destinationRegion.Height)
{
try
{
BitmapContent.Copy(sourceBitmap, sourceRegion, this, destinationRegion);
return(true);
}
catch (InvalidOperationException)
{
return(false);
}
}
//SquishFlags targetFormat = SquishFlags.ColourClusterFit;
Format outputFormat = Format.DXT1;
switch (format)
{
case SurfaceFormat.Dxt1:
outputFormat = Format.DXT1;
break;
case SurfaceFormat.Dxt1SRgb:
outputFormat = Format.DXT1;
break;
case SurfaceFormat.Dxt3:
outputFormat = Format.DXT3;
break;
case SurfaceFormat.Dxt3SRgb:
outputFormat = Format.DXT3;
break;
case SurfaceFormat.Dxt5:
outputFormat = Format.DXT5;
break;
case SurfaceFormat.Dxt5SRgb:
outputFormat = Format.DXT5;
break;
default:
return(false);
}
// libsquish requires RGBA8888
var colorBitmap = new PixelBitmapContent <Color>(sourceBitmap.Width, sourceBitmap.Height);
BitmapContent.Copy(sourceBitmap, colorBitmap);
var sourceData = colorBitmap.GetPixelData();
/*
* var dataSize = Squish.GetStorageRequirements(colorBitmap.Width, colorBitmap.Height, targetFormat);
* var data = new byte[dataSize];
* var metric = new float[] { 1.0f, 1.0f, 1.0f };
* Squish.CompressImage(sourceData, colorBitmap.Width, colorBitmap.Height, data, targetFormat, metric);
* SetPixelData(data);
*/
var dxtCompressor = new Compressor();
var inputOptions = new InputOptions();
if (outputFormat != Format.DXT1)
{
inputOptions.SetAlphaMode(AlphaMode.Premultiplied);
}
else
{
inputOptions.SetAlphaMode(AlphaMode.None);
}
inputOptions.SetTextureLayout(TextureType.Texture2D, colorBitmap.Width, colorBitmap.Height, 1);
// Small hack here. NVTT wants 8bit data in BGRA. Flip the B and R channels
// again here.
GraphicsUtil.BGRAtoRGBA(sourceData);
var dataHandle = GCHandle.Alloc(sourceData, GCHandleType.Pinned);
try
{
var dataPtr = dataHandle.AddrOfPinnedObject();
inputOptions.SetMipmapData(dataPtr, colorBitmap.Width, colorBitmap.Height, 1, 0, 0);
inputOptions.SetMipmapGeneration(false);
inputOptions.SetGamma(1.0f, 1.0f);
var outputOptions = new OutputOptions();
outputOptions.SetOutputHeader(false);
var handler = new DxtDataHandler(this);
outputOptions.SetOutputHandler(handler.BeginImage, handler.WriteData);
var compressionOptions = new CompressionOptions();
compressionOptions.SetFormat(outputFormat);
compressionOptions.SetQuality(Quality.Normal);
dxtCompressor.Compress(inputOptions, compressionOptions, outputOptions);
}
finally
{
dataHandle.Free();
}
return(true);
}