protected override bool TryCopyFrom(
BitmapContent sourceBitmap, Rectangle sourceRegion, Rectangle destinationRegion)
{
if (!sourceBitmap.TryGetFormat(out SurfaceFormat sourceFormat))
{
return(false);
}
TryGetFormat(out SurfaceFormat 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 (sourceBitmap is PixelBitmapContent <RgbaVector> &&
sourceRegion.Width == destinationRegion.Width &&
sourceRegion.Height == destinationRegion.Height)
{
ATICompressor.CompressionFormat targetFormat;
switch (format)
{
case SurfaceFormat.RgbaAtcExplicitAlpha:
targetFormat = ATICompressor.CompressionFormat.AtcRgbaExplicitAlpha;
break;
case SurfaceFormat.RgbaAtcInterpolatedAlpha:
targetFormat = ATICompressor.CompressionFormat.AtcRgbaInterpolatedAlpha;
break;
default:
return(false);
}
var sourceData = sourceBitmap.GetPixelData();
var compressedData = ATICompressor.Compress(sourceData, Width, Height, targetFormat);
SetPixelData(compressedData);
return(true);
}
try
{
Copy(sourceBitmap, sourceRegion, this, destinationRegion);
return(true);
}
catch (InvalidOperationException)
{
return(false);
}
}
public void TestRGBToETC1Compression()
{
byte[] data = new byte[128 * 128 * 4];
for (int i = 0; i < data.Length; i++)
{
data [i] = (i % 2) == 0 ? (byte)0 : (byte)1;
}
var output = ATICompressor.Compress(data, 128, 128, ATICompressor.CompressionFormat.Etc1);
Assert.AreEqual(8192, output.Length, "Compressed data was not the correct length");
}
public void TestRGBAToATITCCompression()
{
byte[] data = new byte[128 * 128 * 4];
for (int i = 0; i < data.Length; i++)
{
data [i] = (i % 2) == 0 ? (byte)0 : (byte)1;
}
var output = ATICompressor.Compress(data, 128, 128, ATICompressor.CompressionFormat.AtcRgbaExplicitAlpha);
Assert.AreEqual(16384, output.Length, "Compressed data was not the correct length");
}
/// <summary>
/// Compress Texture from RGBA32 to dest byte arrays
/// </summary>
/// <param name="format">Texture2D TextureFormat</param>
/// <param name="width">Texture2D width</param>
/// <param name="height">Texture2D height</param>
/// <param name="sourceData">RGBA32 source data 8bit per channel {R8:G8:B8:A8}</param>
/// <param name="output">dest byte arrays</param>
/// <returns></returns>
public static bool CompressTexture(TextureFormat format, int width, int height, byte[] sourceData, out byte[] output)
{
bool result = true;
int pos;
int outPos;
output = new byte[] { };
switch (format)
{
case TextureFormat.Alpha8:
output = new byte[width * height];
pos = 0;
outPos = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
var fR = sourceData[pos];
var fG = sourceData[pos + 1];
var fB = sourceData[pos + 2];
var fA = sourceData[pos + 3];
output[outPos] = (byte)(((fR + fB + fG) / 3) & 0XFF);
pos += 4;
outPos += 1;
}
}
break;
case TextureFormat.ARGB4444:
output = new byte[width * height * 2];
using (var pvrTexture = PVRTexLibNET.PVRTexture.CreateTexture(sourceData, (uint)width, (uint)height, 1, PVRTexLibNET.PixelFormat.RGBA8888, true, VariableType.UnsignedByte, ColourSpace.sRGB))
{
bool bDoDither = true; //降色抖动算法
pvrTexture.Transcode(PVRTexLibNET.PixelFormat.RGBA4444, VariableType.UnsignedByte, ColourSpace.sRGB, CompressorQuality.PVRTCNormal, bDoDither);
var texDataSize = pvrTexture.GetTextureDataSize(0);
var texData = new byte[texDataSize];
pvrTexture.GetTextureData(texData, texDataSize); // texData 是 {A ,B , G, R}结构的像素字节数组，和传入的相反
output = new byte[texDataSize];
// Unity 的ARGB4444需要的是｛B , G, R, A｝的数组，所以需要交换通道
pos = 0;
outPos = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
var v0 = texData[pos];
var v1 = texData[pos + 1];
// 4bit little endian {A, B},{G, R}
var sA = v0 & 0xF0 >> 4;
var sB = (v0 & 0xF0) >> 4;
var sG = v1 & 0xF0 >> 4;
var sR = (v1 & 0xF0) >> 4;
// swap to little endian {B, G, R, A }
// Unity早版本还有一种 R, G,B, A的格式，需要再次swap
var fB = sB & 0xf;
var fG = sG & 0xf;
var fR = sR & 0xf;
var fA = sA & 0xf;
output[outPos] = (byte)((fG << 4) + fB);
output[outPos + 1] = (byte)((fA << 4) + fR);
pos += 2;
outPos += 2;
}
}
result = true;
}
break;
case TextureFormat.RGB565:
using (var pvrTexture = PVRTexLibNET.PVRTexture.CreateTexture(sourceData, (uint)width, (uint)height, 1, PVRTexLibNET.PixelFormat.RGBA8888, true, VariableType.UnsignedByte, ColourSpace.sRGB))
{
bool bDoDither = true;
pvrTexture.Transcode(PVRTexLibNET.PixelFormat.RGB565, VariableType.UnsignedByte, ColourSpace.sRGB, CompressorQuality.ETCMedium, bDoDither);
var texDataSize = pvrTexture.GetTextureDataSize(0);
var texData = new byte[texDataSize];
pvrTexture.GetTextureData(texData, texDataSize);
output = texData;
result = true;
}
break;
case TextureFormat.RGB24:
pos = 0;
outPos = 0;
output = new byte[width * height * 3];
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// 4bit little endian {A, B},{G, R}
var sR = sourceData[pos];
var sG = sourceData[pos + 1];
var sB = sourceData[pos + 2];
var sA = sourceData[pos + 3];
output[outPos] = (byte)sR;
output[outPos + 1] = (byte)sG;
output[outPos + 2] = (byte)sB;
pos += 4;
outPos += 3;
}
}
result = true;
break;
case TextureFormat.RGBA32:
output = sourceData;
result = true;
break;
case TextureFormat.ARGB32:
pos = 0;
outPos = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
var fA = sourceData[pos];
var fR = sourceData[pos + 1];
var fG = sourceData[pos + 2];
var fB = sourceData[pos + 3];
output[outPos] = fR;
output[outPos + 1] = fG;
output[outPos + 2] = fB;
output[outPos + 3] = fA;
pos += 4;
outPos += 4;
}
}
result = true;
break;
case TextureFormat.ATC_RGBA8:
output = ATICompressor.Compress(sourceData, width, height, ATICompressor.CompressionFormat.AtcRgbaExplicitAlpha);
break;
case TextureFormat.ATC_RGB4:
output = ATICompressor.Compress(sourceData, width, height, ATICompressor.CompressionFormat.AtcRgb);
break;
case TextureFormat.ETC2_RGBA8:
output = ATICompressor.Compress(sourceData, width, height, ATICompressor.CompressionFormat.Etc2Rgba);
break;
case TextureFormat.ETC_RGB4:
output = ATICompressor.Compress(sourceData, width, height, ATICompressor.CompressionFormat.Etc1);
break;
case TextureFormat.DXT5:
using (DxtCompressor compressor = new DxtCompressor())
{
result = compressor.Compress(sourceData, width, height, Nvidia.TextureTools.Format.DXT5, out output);
}
break;
case TextureFormat.DXT1:
using (DxtCompressor compressor = new DxtCompressor())
{
result = compressor.Compress(sourceData, width, height, Nvidia.TextureTools.Format.DXT1, out output);
}
break;
case TextureFormat.ASTC_RGBA_4x4:
Console.WriteLine("compressing astc 4x4");
astcencWrapper.EncodeASTC(sourceData, width, height, 4, 4, out output);
break;
case TextureFormat.ASTC_RGB_4x4:
Console.WriteLine("compressing astc 4x4");
astcencWrapper.EncodeASTC(sourceData, width, height, 4, 4, out output);
break;
default:
result = false;
break;
}
return(result);
}
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);
}
}
// Convert to full colour 32-bit format. Floating point would be preferred for processing, but it appears the ATICompressor does not support this
var colorBitmap = new PixelBitmapContent <Color>(sourceRegion.Width, sourceRegion.Height);
BitmapContent.Copy(sourceBitmap, sourceRegion, colorBitmap, new Rectangle(0, 0, colorBitmap.Width, colorBitmap.Height));
sourceBitmap = colorBitmap;
ATICompressor.CompressionFormat targetFormat;
switch (format)
{
case SurfaceFormat.RgbaAtcExplicitAlpha:
targetFormat = ATICompressor.CompressionFormat.AtcRgbaExplicitAlpha;
break;
case SurfaceFormat.RgbaAtcInterpolatedAlpha:
targetFormat = ATICompressor.CompressionFormat.AtcRgbaInterpolatedAlpha;
break;
default:
return(false);
}
var sourceData = sourceBitmap.GetPixelData();
var compressedData = ATICompressor.Compress(sourceData, Width, Height, targetFormat);
SetPixelData(compressedData);
return(true);
}
