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); }