private FI.FIBITMAP _encode(Stream input, CodecData codecData)
{
var ret = new FI.FIBITMAP();
ret.SetNull();
var imgData = codecData as ImageData;
if (imgData != null)
{
var data = new byte[(int)input.Length];
input.Read(data, 0, data.Length);
var dataPtr = BufferBase.Wrap(data);
var src = new PixelBox(imgData.width, imgData.height, imgData.depth, imgData.format, dataPtr);
// The required format, which will adjust to the format
// actually supported by FreeImage.
var requiredFormat = imgData.format;
// determine the settings
var imageType = FI.FREE_IMAGE_TYPE.FIT_UNKNOWN;
var determiningFormat = imgData.format;
switch (determiningFormat)
{
case PixelFormat.R5G6B5:
case PixelFormat.B5G6R5:
case PixelFormat.R8G8B8:
case PixelFormat.B8G8R8:
case PixelFormat.A8R8G8B8:
case PixelFormat.X8R8G8B8:
case PixelFormat.A8B8G8R8:
case PixelFormat.X8B8G8R8:
case PixelFormat.B8G8R8A8:
case PixelFormat.R8G8B8A8:
case PixelFormat.A4L4:
case PixelFormat.BYTE_LA:
case PixelFormat.R3G3B2:
case PixelFormat.A4R4G4B4:
case PixelFormat.A1R5G5B5:
case PixelFormat.A2R10G10B10:
case PixelFormat.A2B10G10R10:
// I'd like to be able to use r/g/b masks to get FreeImage to load the data
// in it's existing format, but that doesn't work, FreeImage needs to have
// data in RGB[A] (big endian) and BGR[A] (little endian), always.
if (PixelUtil.HasAlpha(determiningFormat))
{
if (FI.FreeImageEngine.IsLittleEndian)
{
requiredFormat = PixelFormat.BYTE_BGRA;
}
else
{
requiredFormat = PixelFormat.BYTE_RGBA;
}
}
else
{
if (FI.FreeImageEngine.IsLittleEndian)
{
requiredFormat = PixelFormat.BYTE_BGR;
}
else
{
requiredFormat = PixelFormat.BYTE_RGB;
}
}
imageType = FI.FREE_IMAGE_TYPE.FIT_BITMAP;
break;
case PixelFormat.L8:
case PixelFormat.A8:
imageType = FI.FREE_IMAGE_TYPE.FIT_BITMAP;
break;
case PixelFormat.L16:
imageType = FI.FREE_IMAGE_TYPE.FIT_UINT16;
break;
case PixelFormat.SHORT_GR:
requiredFormat = PixelFormat.SHORT_RGB;
break;
case PixelFormat.SHORT_RGB:
imageType = FI.FREE_IMAGE_TYPE.FIT_RGB16;
break;
case PixelFormat.SHORT_RGBA:
imageType = FI.FREE_IMAGE_TYPE.FIT_RGBA16;
break;
case PixelFormat.FLOAT16_R:
requiredFormat = PixelFormat.FLOAT32_R;
break;
case PixelFormat.FLOAT32_R:
imageType = FI.FREE_IMAGE_TYPE.FIT_FLOAT;
break;
case PixelFormat.FLOAT16_GR:
case PixelFormat.FLOAT16_RGB:
case PixelFormat.FLOAT32_GR:
requiredFormat = PixelFormat.FLOAT32_RGB;
break;
case PixelFormat.FLOAT32_RGB:
imageType = FI.FREE_IMAGE_TYPE.FIT_RGBF;
break;
case PixelFormat.FLOAT16_RGBA:
requiredFormat = PixelFormat.FLOAT32_RGBA;
break;
case PixelFormat.FLOAT32_RGBA:
imageType = FI.FREE_IMAGE_TYPE.FIT_RGBAF;
break;
default:
throw new AxiomException("Not Supported image format :{0}", determiningFormat.ToString());
} //end switch
// Check support for this image type & bit depth
if (!FI.FreeImage.FIFSupportsExportType((FI.FREE_IMAGE_FORMAT) this._freeImageType, imageType) ||
!FI.FreeImage.FIFSupportsExportBPP((FI.FREE_IMAGE_FORMAT) this._freeImageType,
PixelUtil.GetNumElemBits(requiredFormat)))
{
// Ok, need to allocate a fallback
// Only deal with RGBA . RGB for now
switch (requiredFormat)
{
case PixelFormat.BYTE_RGBA:
requiredFormat = PixelFormat.BYTE_RGB;
break;
case PixelFormat.BYTE_BGRA:
requiredFormat = PixelFormat.BYTE_BGR;
break;
default:
break;
}
}
var conversionRequired = false;
input.Position = 0;
var srcData = new byte[(int)input.Length];
input.Read(srcData, 0, srcData.Length);
var srcDataPtr = BufferBase.Wrap(srcData);
// Check BPP
var bpp = PixelUtil.GetNumElemBits(requiredFormat);
if (!FI.FreeImage.FIFSupportsExportBPP((FI.FREE_IMAGE_FORMAT) this._freeImageType, bpp))
{
if (bpp == 32 && PixelUtil.HasAlpha(imgData.format) &&
FI.FreeImage.FIFSupportsExportBPP((FI.FREE_IMAGE_FORMAT) this._freeImageType, 24))
{
// drop to 24 bit (lose alpha)
if (FI.FreeImage.IsLittleEndian())
{
requiredFormat = PixelFormat.BYTE_BGR;
}
else
{
requiredFormat = PixelFormat.BYTE_RGB;
}
bpp = 24;
}
else if (bpp == 128 && PixelUtil.HasAlpha(imgData.format) &&
FI.FreeImage.FIFSupportsExportBPP((FI.FREE_IMAGE_FORMAT) this._freeImageType, 96))
{
// drop to 96-bit floating point
requiredFormat = PixelFormat.FLOAT32_RGB;
}
}
var convBox = new PixelBox(imgData.width, imgData.height, 1, requiredFormat);
if (requiredFormat != imgData.format)
{
conversionRequired = true;
// Allocate memory
var convData = new byte[convBox.ConsecutiveSize];
convBox.Data = BufferBase.Wrap(convData);
// perform conversion and reassign source
var newSrc = new PixelBox(imgData.width, imgData.height, 1, imgData.format, dataPtr);
PixelConverter.BulkPixelConversion(newSrc, convBox);
srcDataPtr = convBox.Data;
}
ret = FI.FreeImage.AllocateT(imageType, imgData.width, imgData.height, bpp);
if (ret.IsNull)
{
if (conversionRequired)
{
srcDataPtr.SafeDispose();
convBox = null;
}
throw new AxiomException("FreeImage.AllocateT failed - possibly out of memory. ");
}
if (requiredFormat == PixelFormat.L8 || requiredFormat == PixelFormat.A8)
{
// Must explicitly tell FreeImage that this is greyscale by setting
// a "grey" palette (otherwise it will save as a normal RGB
// palettized image).
var tmp = FI.FreeImage.ConvertToGreyscale(ret);
FI.FreeImage.Unload(ret);
ret = tmp;
}
var dstPitch = (int)FI.FreeImage.GetPitch(ret);
var srcPitch = imgData.width * PixelUtil.GetNumElemBytes(requiredFormat);
// Copy data, invert scanlines and respect FreeImage pitch
var pSrc = srcDataPtr;
using (var pDest = BufferBase.Wrap(FI.FreeImage.GetBits(ret), imgData.height * srcPitch))
{
var byteSrcData = pSrc;
var byteDstData = pDest;
for (var y = 0; y < imgData.height; ++y)
{
byteSrcData += (imgData.height - y - 1) * srcPitch;
Memory.Copy(pSrc, pDest, srcPitch);
byteDstData += dstPitch;
}
}
if (conversionRequired)
{
// delete temporary conversion area
srcDataPtr.SafeDispose();
convBox = null;
}
}
return(ret);
}
public static void ConvertToIL(PixelBox src)
{
// ilTexImage http://openil.sourceforge.net/docs/il/f00059.htm
var ifmt = Convert(src.Format);
if (src.IsConsecutive && ifmt.IsValid)
{
// The easy case, the buffer is laid out in memory just like
// we want it to be and is in a format DevIL can understand directly
// We could even save the copy if DevIL would let us
Il.ilTexImage(src.Width, src.Height, src.Depth, (byte)ifmt.Channels, ifmt.Format, ifmt.Type, src.Data.Pin());
src.Data.UnPin();
}
else if (ifmt.IsValid)
{
// The format can be understood directly by DevIL. The only
// problem is that ilTexImage expects our image data consecutively
// so we cannot use that directly.
// Let DevIL allocate the memory for us, and copy the data consecutively
// to its memory
Il.ilTexImage(src.Width, src.Height, src.Depth, (byte)ifmt.Channels, ifmt.Format, ifmt.Type, IntPtr.Zero);
using (var dstbuf = BufferBase.Wrap(Il.ilGetData(), Il.ilGetInteger(Il.IL_IMAGE_SIZE_OF_DATA)))
{
var dst = new PixelBox(src.Width, src.Height, src.Depth, src.Format, dstbuf);
PixelConverter.BulkPixelConversion(src, dst);
}
}
else
{
// Here it gets ugly. We're stuck with a pixel format that DevIL
// can't do anything with. We will do a bulk pixel conversion and
// then feed it to DevIL anyway. The problem is finding the best
// format to convert to.
// most general format supported by Axiom and DevIL
var fmt = PixelUtil.HasAlpha(src.Format) ? PixelFormat.FLOAT32_RGBA : PixelFormat.FLOAT32_RGB;
// Make up a pixel format
// We don't have to consider luminance formats as they have
// straight conversions to DevIL, just weird permutations of RGBA an LA
var depths = PixelUtil.GetBitDepths(src.Format);
// Native endian format with all bit depths<8 can safely and quickly be
// converted to 24/32 bit
if (PixelUtil.IsNativeEndian(src.Format) && depths[0] <= 8 && depths[1] <= 8 && depths[2] <= 8 &&
depths[3] <= 8)
{
if (PixelUtil.HasAlpha(src.Format))
{
fmt = PixelFormat.A8R8G8B8;
}
else
{
fmt = PixelFormat.R8G8B8;
}
}
// Let DevIL allocate the memory for us, then do the conversion ourselves
ifmt = Convert(fmt);
Il.ilTexImage(src.Width, src.Height, src.Depth, (byte)ifmt.Channels, ifmt.Format, ifmt.Type, IntPtr.Zero);
// TAO 2.0
//Il.ilTexImage( src.Width, src.Height, src.Depth, (byte)ifmt.Channels, ifmt.Format, ifmt.Type, null );
using (var dstbuf = BufferBase.Wrap(Il.ilGetData(), Il.ilGetInteger(Il.IL_IMAGE_SIZE_OF_DATA)))
{
var dst = new PixelBox(src.Width, src.Height, src.Depth, fmt, dstbuf);
PixelConverter.BulkPixelConversion(src, dst);
}
}
}
