/// <summary> /// Loads a Windows Bitmap. /// </summary> /// <param name="rasterImage">The image storage.</param> /// <param name="stream">The stream containing the image.</param> /// <exception cref="InvalidOperationException">If the stream represents an invalid or unsupported image format.</exception> public static void LoadBmp(this RasterImage rasterImage, Stream stream) => Load(stream, rasterImage);
/// <summary>
/// Loads a Windows Bitmap.
/// </summary>
/// <param name="stream">The stream containing the image.</param>
/// <param name="rasterImage">The image storage.</param>
/// <exception cref="InvalidOperationException">If the stream represents an invalid or unsupported image format.</exception>
public static void Load(Stream stream, RasterImage rasterImage)
{
var decoder = new BinaryDecoder(stream);
if (decoder.ReadByte() != 'B' || decoder.ReadByte() != 'M')
{
throw new InvalidOperationException(Resources.FormatMessage(Resources.Key.InvalidFileMarker, "Windows Bitmap"));
}
decoder.Skip(8);
var offset = decoder.ReadInt32LittleEndian();
var headerSize = decoder.ReadInt32LittleEndian();
int imageWidth;
int imageHeight;
switch (headerSize)
{
case 12:
imageWidth = decoder.ReadInt16LittleEndian();
imageHeight = decoder.ReadInt16LittleEndian();
break;
case 40:
case 56:
case 108:
case 124:
imageWidth = decoder.ReadInt32LittleEndian();
imageHeight = decoder.ReadInt32LittleEndian();
break;
default:
throw new InvalidOperationException(Resources.FormatMessage(Resources.Key.InvalidHeaderSize, headerSize));
}
if (decoder.ReadInt16LittleEndian() != 1)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidHeader));
}
int bitsPerPixel = decoder.ReadInt16LittleEndian();
uint maskRed = 0;
uint maskGreen = 0;
uint maskBlue = 0;
uint maskAlpha = 0;
int alpha = 255;
if (headerSize > 12)
{
int compressionMethod = decoder.ReadInt32LittleEndian();
if (compressionMethod == 1 || compressionMethod == 2)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.RLECompressionsNotSupported));
}
decoder.Skip(20);
if (headerSize <= 56)
{
if (headerSize == 56)
{
decoder.Skip(16);
}
if (bitsPerPixel == 16 || bitsPerPixel == 32)
{
if (compressionMethod == 0)
{
if (bitsPerPixel == 32)
{
maskRed = 0xff << 16;
maskGreen = 0xff << 8;
maskBlue = 0xff;
maskAlpha = 0xffu << 24;
alpha = 0;
}
else
{
maskRed = 0x1f << 10;
maskGreen = 0x1f << 5;
maskBlue = 0x1f;
}
}
else if (compressionMethod == 3)
{
maskRed = decoder.ReadUInt32LittleEndian();
maskGreen = decoder.ReadUInt32LittleEndian();
maskBlue = decoder.ReadUInt32LittleEndian();
if (maskRed == maskGreen && maskGreen == maskBlue)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidHeader));
}
}
else
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidHeader));
}
}
}
else
{
maskRed = decoder.ReadUInt32LittleEndian();
maskGreen = decoder.ReadUInt32LittleEndian();
maskBlue = decoder.ReadUInt32LittleEndian();
maskAlpha = decoder.ReadUInt32LittleEndian();
decoder.Skip(52);
if (headerSize == 124)
{
decoder.Skip(16);
}
}
}
bool flipY = imageHeight > 0;
imageHeight = Math.Abs(imageHeight);
int paletteSize = 0;
if (headerSize == 12)
{
if (bitsPerPixel < 24)
{
paletteSize = (offset - 14 - 24) / 3;
}
}
else
{
if (bitsPerPixel < 16)
{
paletteSize = (offset - 14 - headerSize) >> 2;
}
}
int bytesPerPixel = (maskAlpha == 0) ? 3 : 4;
var imageLength = bytesPerPixel * imageWidth * imageHeight;
byte[] image;
if (rasterImage.Data.Length >= imageLength)
{
image = rasterImage.Data;
}
else
{
image = new byte[imageLength];
}
if (bitsPerPixel < 16)
{
if (paletteSize == 0 || paletteSize > 256)
{
throw new InvalidOperationException(Resources.FormatMessage(Resources.Key.InvalidPaletteSize, paletteSize));
}
var palette = new byte[256, 3];
for (int i = 0; i < paletteSize; i++)
{
palette[i, 2] = decoder.ReadByte();
palette[i, 1] = decoder.ReadByte();
palette[i, 0] = decoder.ReadByte();
if (headerSize != 12)
{
decoder.Skip(1);
}
}
decoder.Skip(offset - 14 - headerSize - paletteSize * (headerSize == 12 ? 3 : 4));
int k = 0;
switch (bitsPerPixel)
{
case 1:
{
int padding = (imageWidth + 7) >> 3;
padding = (-padding) & 3;
for (int j = 0; j < imageHeight; j++)
{
int bitOffset = 7;
int index = decoder.ReadByte();
for (int i = 0; i < imageWidth; i++)
{
int color = (index >> bitOffset) & 1;
image[k++] = palette[color, 0];
image[k++] = palette[color, 1];
image[k++] = palette[color, 2];
if (--bitOffset < 0)
{
bitOffset = 7;
index = decoder.ReadByte();
}
}
decoder.Skip(padding);
}
}
break;
case 4:
{
int padding = (imageWidth + 1) >> 1;
padding = (-padding) & 3;
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i += 2)
{
int index = decoder.ReadByte();
int index2 = index & 0xF;
index >>= 4;
image[k++] = palette[index, 0];
image[k++] = palette[index, 1];
image[k++] = palette[index, 2];
if (bytesPerPixel == 4)
{
image[k++] = 255;
}
if (i + 1 == imageWidth)
{
break;
}
image[k++] = palette[index2, 0];
image[k++] = palette[index2, 1];
image[k++] = palette[index2, 2];
if (bytesPerPixel == 4)
{
image[k++] = 255;
}
}
decoder.Skip(padding);
}
}
break;
case 8:
{
int padding = (-imageWidth) & 3;
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i++)
{
int index = decoder.ReadByte();
image[k++] = palette[index, 0];
image[k++] = palette[index, 1];
image[k++] = palette[index, 2];
if (bytesPerPixel == 4)
{
image[k++] = 255;
}
}
decoder.Skip(padding);
}
}
break;
default:
throw new InvalidOperationException(Resources.FormatMessage(Resources.Key.InvalidBPP, bitsPerPixel));
}
}
else
{
decoder.Skip(offset - 14 - headerSize);
int k = 0;
if (bitsPerPixel == 24)
{
int padding = (imageWidth + 1) >> 1;
padding = (-padding) & 3;
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i++)
{
image[k + 2] = decoder.ReadByte();
image[k + 1] = decoder.ReadByte();
image[k] = decoder.ReadByte();
k += 3;
if (bytesPerPixel == 4)
{
image[k++] = 255;
}
}
decoder.Skip(padding);
}
}
else if (bitsPerPixel == 16)
{
if (maskRed == 0 || maskGreen == 0 || maskGreen == 0)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidColorMask));
}
int padding = imageWidth;
padding = (-padding) & 3;
int redShift = GetHighOneIndex(maskRed) - 7;
int redBits = GetOneCount(maskRed);
int greenShift = GetHighOneIndex(maskGreen) - 7;
int greenBits = GetOneCount(maskGreen);
int blueShift = GetHighOneIndex(maskBlue) - 7;
int blueBits = GetOneCount(maskBlue);
int alphaShift = GetHighOneIndex(maskAlpha) - 7;
int alphaBits = GetOneCount(maskAlpha);
if (maskAlpha == 0)
{
alpha = 255;
}
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i++)
{
uint value = decoder.ReadUInt16LittleEndian();
image[k++] = (byte)DecodeComponent(value & maskRed, redShift, redBits);
image[k++] = (byte)DecodeComponent(value & maskGreen, greenShift, greenBits);
image[k++] = (byte)DecodeComponent(value & maskBlue, blueShift, blueBits);
if (maskAlpha == 0)
{
image[k++] = 255;
}
else
{
var a = (byte)DecodeComponent(value & maskAlpha, alphaShift, alphaBits);
image[k++] = a;
alpha |= a;
}
}
decoder.Skip(padding);
}
}
else
{
if (maskBlue == 0xff && maskGreen == 0xff00 && maskRed == 0x00ff0000 && maskAlpha == 0xff000000)
{
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i++)
{
image[k + 2] = decoder.ReadByte();
image[k + 1] = decoder.ReadByte();
image[k] = decoder.ReadByte();
k += 3;
var a = decoder.ReadByte();
image[k++] = a;
alpha |= a;
}
}
}
else
{
if (maskRed == 0 || maskGreen == 0 || maskGreen == 0)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidColorMask));
}
int redShift = GetHighOneIndex(maskRed) - 7;
int redBits = GetOneCount(maskRed);
int greenShift = GetHighOneIndex(maskGreen) - 7;
int greenBits = GetOneCount(maskGreen);
int blueShift = GetHighOneIndex(maskBlue) - 7;
int blueBits = GetOneCount(maskBlue);
int alphaShift = GetHighOneIndex(maskAlpha) - 7;
int alphaBits = GetOneCount(maskAlpha);
if (maskAlpha == 0)
{
alpha = 255;
}
for (int j = 0; j < imageHeight; j++)
{
for (int i = 0; i < imageWidth; i++)
{
uint value = decoder.ReadUInt32LittleEndian();
image[k++] = (byte)DecodeComponent(value & maskRed, redShift, redBits);
image[k++] = (byte)DecodeComponent(value & maskGreen, greenShift, greenBits);
image[k++] = (byte)DecodeComponent(value & maskBlue, blueShift, blueBits);
if (maskAlpha == 0)
{
image[k++] = 255;
}
else
{
var a = (byte)DecodeComponent(value & maskAlpha, alphaShift, alphaBits);
image[k++] = a;
alpha |= a;
}
}
}
}
}
if (alpha == 0)
{
for (int i = 0; i < image.Length; i += 4)
{
image[i] = 255;
}
}
}
if (flipY)
{
int halfHeight = imageHeight / 2;
int lineWidth = imageWidth * bytesPerPixel;
for (int j = 0; j < halfHeight; j++)
{
int i1 = imageWidth * bytesPerPixel * j;
int i2 = imageWidth * bytesPerPixel * (imageHeight - 1 - j);
for (int i = 0; i < lineWidth; i++)
{
var t = image[i1 + i];
image[i1 + i] = image[i2 + i];
image[i2 + i] = t;
}
}
}
rasterImage.Size = (imageWidth, imageHeight);
rasterImage.Format = (bytesPerPixel == 4) ? RasterImageFormat.TrueColorAlpha : RasterImageFormat.TrueColor;
rasterImage.ComponentType = RasterImageComponentType.UnsignedByte;
rasterImage.Data = image;
}
/// <summary>
/// Loads a Portable Network Graphics image.
/// </summary>
/// <param name="stream">The stream containing the image.</param>
/// <param name="rasterImage">The image storage.</param>
/// <exception cref="InvalidOperationException">If the stream represents an invalid or unsupported image format.</exception>
public static void Load(Stream stream, RasterImage rasterImage)
{
var decoder = new BinaryDecoder(stream);
if (decoder.ReadByte() != 137 || decoder.ReadByte() != 80 || decoder.ReadByte() != 78 || decoder.ReadByte() != 71)
{
throw new InvalidOperationException(Resources.FormatMessage(Resources.Key.InvalidFileMarker, "Portable Network Graphics"));
}
decoder.Skip(8);
if (decoder.ReadByte() != 'I' || decoder.ReadByte() != 'H' || decoder.ReadByte() != 'D' || decoder.ReadByte() != 'R')
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidHeader));
}
var width = decoder.ReadInt32BigEndian();
var height = decoder.ReadInt32BigEndian();
rasterImage.Size = (width, height);
var colorDepth = decoder.ReadByte();
var colorType = decoder.ReadByte();
var bitsPerPixel = GetBitsPerPixel(rasterImage, colorDepth, colorType);
if (decoder.ReadByte() != 0 || decoder.ReadByte() != 0)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidFormat));
}
if (decoder.ReadByte() != 0)
{
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InterlacedPNGNotSupported));
}
decoder.Skip(4);
using var inflateStream = new DeflateStream(new PortableNetworkGraphicsDataStream(decoder), CompressionMode.Decompress);
var dataLength = (width * height * bitsPerPixel + 7) / 8;
byte[] data;
if (rasterImage.Data.Length >= dataLength)
{
data = rasterImage.Data;
}
else
{
data = new byte[dataLength];
}
var bytesPerPixel = (bitsPerPixel + 7) / 8;
var bytesPerLine = (width * bitsPerPixel + 7) / 8;
var bitPadding = bytesPerLine * 8 - width * bitsPerPixel;
var removePaddings = bitsPerPixel < 8 && bitPadding != 0;
var previousLine = new byte[bytesPerLine];
var currentLine = new byte[bytesPerLine];
for (int y = 0; y < height; y++)
{
var filterType = inflateStream.ReadByte();
var offset = 0;
var count = bytesPerLine;
for (;;)
{
var read = inflateStream.Read(currentLine, offset, count);
if (read == 0)
{
throw new EndOfStreamException();
}
offset += read;
count -= read;
if (count == 0)
{
break;
}
}
switch (filterType)
{
case 0:
break;
case 1:
for (int i = bytesPerPixel; i < bytesPerLine; i++)
{
currentLine[i] += currentLine[i - bytesPerPixel];
}
break;
case 2:
for (int i = 0; i < bytesPerLine; i++)
{
currentLine[i] += previousLine[i];
}
break;
case 3:
for (int i = 0; i < bytesPerPixel; i++)
{
currentLine[i] += (byte)(previousLine[i] >> 1);
}
for (int i = bytesPerPixel; i < bytesPerLine; i++)
{
currentLine[i] += (byte)((currentLine[i - bytesPerPixel] + previousLine[i]) >> 1);
}
break;
case 4:
for (int i = 0; i < bytesPerPixel; i++)
{
currentLine[i] += (byte)ComputePredictor(0, previousLine[i], 0);
}
for (int i = bytesPerPixel; i < bytesPerLine; i++)
{
currentLine[i] += (byte)ComputePredictor(currentLine[i - bytesPerPixel], previousLine[i], previousLine[i - bytesPerPixel]);
}
break;
default:
throw new InvalidOperationException(Resources.GetMessage(Resources.Key.InvalidFormat));
}
if (removePaddings)
{
throw new NotImplementedException();
}
else
{
Array.Copy(currentLine, 0, data, bytesPerLine * y, bytesPerLine);
}
var t = previousLine;
previousLine = currentLine;
currentLine = t;
}
rasterImage.Data = data;
}
