| public static GetMemorySize ( int width, int height, int depth, PixelFormat format ) : int | ||
| width | int | Width of the area |
| height | int | Height of the area |
| depth | int | Depth of the area |
| format | PixelFormat | Format of the area |
| return | int | |
public PixelBox GetPixelBox(int face, int mipmap)
{
if (mipmap > numMipMaps)
{
throw new IndexOutOfRangeException();
}
if (face > this.NumFaces)
{
throw new IndexOutOfRangeException();
}
// Calculate mipmap offset and size
int width = this.Width;
int height = this.Height;
int depth = this.Depth;
int faceSize = 0; // Size of one face of the image
int offset = 0;
for (int mip = 0; mip < mipmap; ++mip)
{
faceSize = PixelUtil.GetMemorySize(width, height, depth, this.Format);
/// Skip all faces of this mipmap
offset += faceSize * this.NumFaces;
/// Half size in each dimension
if (width != 1)
{
width /= 2;
}
if (height != 1)
{
height /= 2;
}
if (depth != 1)
{
depth /= 2;
}
}
// We have advanced to the desired mipmap, offset to right face
faceSize = PixelUtil.GetMemorySize(width, height, depth, this.Format);
offset += faceSize * face;
// Return subface as pixelbox
IntPtr newBufPtr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset);
return(new PixelBox(width, height, depth, this.Format, newBufPtr));
}
public static int CalculateSize(int mipmaps, int faces, int width, int height, int depth, PixelFormat format)
{
int size = 0;
for (int mip = 0; mip <= mipmaps; ++mip)
{
size += PixelUtil.GetMemorySize(width, height, depth, format) * faces;
if (width != 1)
{
width /= 2;
}
if (height != 1)
{
height /= 2;
}
if (depth != 1)
{
depth /= 2;
}
}
return(size);
}
public override Codec.DecodeResult Decode(Stream input)
{
using (var br = new BinaryReader(input))
{
// Read 4 character code
var fileType = br.ReadInt32();
using (var wrap = BufferBase.Wrap(fileType, 2))
{
_flipEndian(wrap, sizeof(uint), 1);
}
if (FOURCC('D', 'D', 'S', ' ') != fileType)
{
throw new AxiomException("This is not a DDS file!");
}
// Read header in full
var header = DDSHeader.Read(br);
// Endian flip if required, all 32-bit values
using (var wrap = BufferBase.Wrap(header, Memory.SizeOf(typeof(DDSHeader))))
{
_flipEndian(wrap, 4, Memory.SizeOf(typeof(DDSHeader)) / 4);
}
// Check some sizes
if (header.size != DDS_HEADER_SIZE)
{
throw new AxiomException("DDS header size mismatch!");
}
if (header.pixelFormat.size != DDS_PIXELFORMAT_SIZE)
{
throw new AxiomException("DDS header size mismatch!");
}
var imgData = new ImageData();
imgData.depth = 1; // (deal with volume later)
imgData.width = header.width;
imgData.height = header.height;
var numFaces = 1; // assume one face until we know otherwise
if ((header.caps.caps1 & DDSCAPS_MIPMAP) != 0)
{
imgData.numMipMaps = header.mipMapCount - 1;
}
else
{
imgData.numMipMaps = 0;
}
imgData.flags = 0;
var decompressDXT = false;
// Figure out basic image type
if ((header.caps.caps2 & DDSCAPS2_CUBEMAP) != 0)
{
imgData.flags |= ImageFlags.CubeMap;
numFaces = 6;
}
else if ((header.caps.caps2 & DDSCAPS2_VOLUME) != 0)
{
imgData.flags |= ImageFlags.Volume;
imgData.depth = header.depth;
}
// Pixel format
var sourceFormat = PixelFormat.Unknown;
if ((header.pixelFormat.flags & DDPF_FOURCC) != 0)
{
sourceFormat = _convertFourCCFormat(header.pixelFormat.fourCC);
}
else
{
sourceFormat = _convertPixelFormat(header.pixelFormat.rgbBits, header.pixelFormat.redMask,
header.pixelFormat.greenMask, header.pixelFormat.blueMask,
(header.pixelFormat.flags & DDPF_ALPHAPIXELS) != 0
? header.pixelFormat.alphaMask
: 0);
}
if (PixelUtil.IsCompressed(sourceFormat))
{
if (!Root.Instance.RenderSystem.Capabilities.HasCapability(Capabilities.TextureCompressionDXT))
{
// We'll need to decompress
decompressDXT = true;
// Convert format
switch (sourceFormat)
{
case PixelFormat.DXT1:
// source can be either 565 or 5551 depending on whether alpha present
// unfortunately you have to read a block to figure out which
// Note that we upgrade to 32-bit pixel formats here, even
// though the source is 16-bit; this is because the interpolated
// values will benefit from the 32-bit results, and the source
// from which the 16-bit samples are calculated may have been
// 32-bit so can benefit from this.
var block = DXTColorBlock.Read(br);
using (var wrap = BufferBase.Wrap(block.colour_0, sizeof(ushort)))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
using (var wrap = BufferBase.Wrap(block.colour_1, sizeof(ushort)))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
// skip back since we'll need to read this again
br.BaseStream.Seek(0 - (long)Memory.SizeOf(typeof(DXTColorBlock)), SeekOrigin.Current);
// colour_0 <= colour_1 means transparency in DXT1
if (block.colour_0 <= block.colour_1)
{
imgData.format = PixelFormat.BYTE_RGBA;
}
else
{
imgData.format = PixelFormat.BYTE_RGB;
}
break;
case PixelFormat.DXT2:
case PixelFormat.DXT3:
case PixelFormat.DXT4:
case PixelFormat.DXT5:
// full alpha present, formats vary only in encoding
imgData.format = PixelFormat.BYTE_RGBA;
break;
default:
// all other cases need no special format handling
break;
}
}
else
{
// Use original format
imgData.format = sourceFormat;
// Keep DXT data compressed
imgData.flags |= ImageFlags.Compressed;
}
}
else // not compressed
{
// Don't test against DDPF_RGB since greyscale DDS doesn't set this
// just derive any other kind of format
imgData.format = sourceFormat;
}
// Calculate total size from number of mipmaps, faces and size
imgData.size = Image.CalculateSize(imgData.numMipMaps, numFaces, imgData.width, imgData.height, imgData.depth, imgData.format);
// Now deal with the data
var dest = new byte[imgData.size];
var destBuffer = BufferBase.Wrap(dest);
// all mips for a face, then each face
for (var i = 0; i < numFaces; ++i)
{
var width = imgData.width;
var height = imgData.height;
var depth = imgData.depth;
for (var mip = 0; mip <= imgData.numMipMaps; ++mip)
{
var dstPitch = width * PixelUtil.GetNumElemBytes(imgData.format);
if (PixelUtil.IsCompressed(sourceFormat))
{
// Compressed data
if (decompressDXT)
{
DXTColorBlock col;
DXTInterpolatedAlphaBlock iAlpha;
DXTExplicitAlphaBlock eAlpha;
// 4x4 block of decompressed colour
var tempColours = new ColorEx[16];
var destBpp = PixelUtil.GetNumElemBytes(imgData.format);
var sx = Utility.Min(width, 4);
var sy = Utility.Min(height, 4);
var destPitchMinus4 = dstPitch - destBpp * sx;
// slices are done individually
for (var z = 0; z < depth; ++z)
{
// 4x4 blocks in x/y
for (var y = 0; y < height; y += 4)
{
for (var x = 0; x < width; x += 4)
{
if (sourceFormat == PixelFormat.DXT2 || sourceFormat == PixelFormat.DXT3)
{
// explicit alpha
eAlpha = DXTExplicitAlphaBlock.Read(br);
using (var wrap = BufferBase.Wrap(eAlpha.alphaRow, eAlpha.alphaRow.Length * sizeof(ushort)))
{
_flipEndian(wrap, sizeof(ushort), 4);
}
_unpackDXTAlpha(eAlpha, tempColours);
}
else if (sourceFormat == PixelFormat.DXT4 || sourceFormat == PixelFormat.DXT5)
{
// interpolated alpha
iAlpha = DXTInterpolatedAlphaBlock.Read(br);
using (var wrap = BufferBase.Wrap(iAlpha.alpha_0, 1))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
using (var wrap = BufferBase.Wrap(iAlpha.alpha_1, 1))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
_unpackDXTAlpha(iAlpha, tempColours);
}
// always read colour
col = DXTColorBlock.Read(br);
using (var wrap = BufferBase.Wrap(col.colour_0, sizeof(ushort)))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
using (var wrap = BufferBase.Wrap(col.colour_1, sizeof(ushort)))
{
_flipEndian(wrap, sizeof(ushort), 1);
}
_unpackDXTColor(sourceFormat, col, tempColours);
// write 4x4 block to uncompressed version
for (var by = 0; by < sy; ++by)
{
for (var bx = 0; bx < sx; ++bx)
{
PixelConverter.PackColor(tempColours[by * 4 + bx], imgData.format, destBuffer);
destBuffer += destBpp;
}
// advance to next row
destBuffer += destPitchMinus4;
}
// next block. Our dest pointer is 4 lines down
// from where it started
if (x + 4 >= width)
{
// Jump back to the start of the line
destBuffer += -destPitchMinus4;
}
else
{
// Jump back up 4 rows and 4 pixels to the
// right to be at the next block to the right
destBuffer += -(dstPitch * sy + destBpp * sx);
}
}
}
}
}
else
{
// load directly
// DDS format lies! sizeOrPitch is not always set for DXT!!
var dxtSize = PixelUtil.GetMemorySize(width, height, depth, imgData.format);
using (var src = BufferBase.Wrap(br.ReadBytes(dxtSize)))
{
Memory.Copy(src, destBuffer, dxtSize);
}
destBuffer += dxtSize;
}
}
else
{
// Final data - trim incoming pitch
int srcPitch;
if ((header.flags & DDSD_PITCH) != 0)
{
srcPitch = header.sizeOrPitch / Utility.Max(1, mip * 2);
}
else
{
// assume same as final pitch
srcPitch = dstPitch;
}
Contract.Requires(dstPitch <= srcPitch);
var srcAdvance = (long)(srcPitch - dstPitch);
for (var z = 0; z < imgData.depth; ++z)
{
for (var y = 0; y < imgData.height; ++y)
{
using (var src = BufferBase.Wrap(br.ReadBytes(dstPitch)))
{
Memory.Copy(src, destBuffer, dstPitch);
}
if (srcAdvance > 0)
{
br.BaseStream.Seek(srcAdvance, SeekOrigin.Current);
}
destBuffer += dstPitch;
}
}
}
// Next mip
if (width != 1)
{
width /= 2;
}
if (height != 1)
{
height /= 2;
}
if (depth != 1)
{
depth /= 2;
}
}
}
destBuffer.Dispose();
return(new DecodeResult(new MemoryStream(dest), imgData));
}
}
public override object Decode(Stream input, Stream output, params object[] args)
{
ImageData data = new ImageData();
int imageID;
int format, bytesPerPixel, imageType;
// create and bind a new image
Il.ilGenImages(1, out imageID);
Il.ilBindImage(imageID);
// Put it right side up
Il.ilEnable(Il.IL_ORIGIN_SET);
Il.ilSetInteger(Il.IL_ORIGIN_MODE, Il.IL_ORIGIN_UPPER_LEFT);
// Keep DXTC(compressed) data if present
Il.ilSetInteger(Il.IL_KEEP_DXTC_DATA, Il.IL_TRUE);
// create a temp buffer and write the stream into it
byte[] buffer = new byte[input.Length];
input.Read(buffer, 0, buffer.Length);
// load the data into DevIL
Il.ilLoadL(this.ILType, buffer, buffer.Length);
// check for an error
int ilError = Il.ilGetError();
if (ilError != Il.IL_NO_ERROR)
{
throw new AxiomException("Error while decoding image data: '{0}'", Ilu.iluErrorString(ilError));
}
format = Il.ilGetInteger(Il.IL_IMAGE_FORMAT);
imageType = Il.ilGetInteger(Il.IL_IMAGE_TYPE);
//bytesPerPixel = Math.Max(Il.ilGetInteger(Il.IL_IMAGE_BPC),
// Il.ilGetInteger(Il.IL_IMAGE_BYTES_PER_PIXEL));
// Convert image if ImageType is incompatible with us (double or long)
if (imageType != Il.IL_BYTE && imageType != Il.IL_UNSIGNED_BYTE &&
imageType != Il.IL_FLOAT &&
imageType != Il.IL_UNSIGNED_SHORT && imageType != Il.IL_SHORT)
{
Il.ilConvertImage(format, Il.IL_FLOAT);
imageType = Il.IL_FLOAT;
}
// Converted paletted images
if (format == Il.IL_COLOUR_INDEX)
{
Il.ilConvertImage(Il.IL_BGRA, Il.IL_UNSIGNED_BYTE);
format = Il.IL_BGRA;
imageType = Il.IL_UNSIGNED_BYTE;
}
bytesPerPixel = Il.ilGetInteger(Il.IL_IMAGE_BYTES_PER_PIXEL);
// populate the image data
data.format = ILUtil.ConvertFromILFormat(format, imageType);
data.width = Il.ilGetInteger(Il.IL_IMAGE_WIDTH);
data.height = Il.ilGetInteger(Il.IL_IMAGE_HEIGHT);
data.depth = Il.ilGetInteger(Il.IL_IMAGE_DEPTH);
data.numMipMaps = Il.ilGetInteger(Il.IL_NUM_MIPMAPS);
data.flags = 0;
if (data.format == PixelFormat.Unknown)
{
Il.ilDeleteImages(1, ref imageID);
throw new AxiomException("Unsupported DevIL format: ImageFormat = {0:x} ImageType = {1:x}", format, imageType);
}
// Check for cubemap
// int cubeflags = Il.ilGetInteger(Il.IL_IMAGE_CUBEFLAGS);
int numFaces = Il.ilGetInteger(Il.IL_NUM_IMAGES) + 1;
if (numFaces == 6)
{
data.flags |= ImageFlags.CubeMap;
}
else
{
numFaces = 1; // Support only 1 or 6 face images for now
}
// Keep DXT data (if present at all and the GPU supports it)
int dxtFormat = Il.ilGetInteger(Il.IL_DXTC_DATA_FORMAT);
if (dxtFormat != Il.IL_DXT_NO_COMP &&
Root.Instance.RenderSystem.Caps.CheckCap(Axiom.Graphics.Capabilities.TextureCompressionDXT))
{
data.format = ILUtil.ConvertFromILFormat(dxtFormat, imageType);
data.flags |= ImageFlags.Compressed;
// Validate that this devil version saves DXT mipmaps
if (data.numMipMaps > 0)
{
Il.ilBindImage(imageID);
Il.ilActiveMipmap(1);
if (Il.ilGetInteger(Il.IL_DXTC_DATA_FORMAT) != dxtFormat)
{
data.numMipMaps = 0;
LogManager.Instance.Write("Warning: Custom mipmaps for compressed image were ignored because they are not loaded by this DevIL version");
}
}
}
// Calculate total size from number of mipmaps, faces and size
data.size = Image.CalculateSize(data.numMipMaps, numFaces,
data.width, data.height,
data.depth, data.format);
// set up buffer for the decoded data
buffer = new byte[data.size];
// Pin the buffer, so we can use our PixelBox methods on it
GCHandle bufGCHandle = new GCHandle();
bufGCHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
IntPtr bufPtr = bufGCHandle.AddrOfPinnedObject();
int offset = 0;
// Dimensions of current mipmap
int width = data.width;
int height = data.height;
int depth = data.depth;
// Transfer data
for (int mip = 0; mip <= data.numMipMaps; ++mip)
{
for (int i = 0; i < numFaces; ++i)
{
Il.ilBindImage(imageID);
if (numFaces > 1)
{
Il.ilActiveImage(i);
}
if (data.numMipMaps > 0)
{
Il.ilActiveMipmap(mip);
}
/// Size of this face
int imageSize = PixelUtil.GetMemorySize(width, height, depth, data.format);
if ((data.flags & ImageFlags.Compressed) != 0)
{
// Compare DXT size returned by DevIL with our idea of the compressed size
if (imageSize == Il.ilGetDXTCData(IntPtr.Zero, 0, dxtFormat))
{
// Retrieve data from DevIL
byte[] tmpBuffer = new byte[imageSize];
Il.ilGetDXTCData(tmpBuffer, imageSize, dxtFormat);
// Copy the data into our output buffer
Array.Copy(tmpBuffer, 0, buffer, offset, tmpBuffer.Length);
}
else
{
LogManager.Instance.Write("Warning: compressed image size mismatch, devilsize={0} oursize={1}",
Il.ilGetDXTCData(IntPtr.Zero, 0, dxtFormat), imageSize);
}
}
else
{
/// Retrieve data from DevIL
PixelBox dst = new PixelBox(width, height, depth, data.format, bufPtr);
dst.Offset = offset;
ILUtil.ToAxiom(dst);
}
offset += imageSize;
}
/// Next mip
if (width != 1)
{
width /= 2;
}
if (height != 1)
{
height /= 2;
}
if (depth != 1)
{
depth /= 2;
}
}
// Restore IL state
Il.ilDisable(Il.IL_ORIGIN_SET);
Il.ilDisable(Il.IL_FORMAT_SET);
// we won't be needing this anymore
Il.ilDeleteImages(1, ref imageID);
output.Write(buffer, 0, buffer.Length);
// Free the buffer we allocated for the conversion.
// I used bufPtr to store my data while I converted it.
// I need to free it here. This invalidates bufPtr.
// My data has already been copied to output.
if (bufGCHandle.IsAllocated)
{
bufGCHandle.Free();
}
return(data);
}
