public static Icon BitmapToIcon(Bitmap b)
{
IconHolder ico = BitmapToIconHolder(b);
Icon newIcon;
using (BinaryWriter bw = new BinaryWriter(new MemoryStream()))
{
ico.Save(bw);
bw.BaseStream.Position = 0;
newIcon = new Icon(bw.BaseStream);
}
return(newIcon);
}
public static IconHolder BitmapToIconHolder(BitmapHolder bmp)
{
bool mapColors = (bmp.info.infoHeader.biBitCount <= 24);
int maximumColors = 1 << bmp.info.infoHeader.biBitCount;
//Hashtable uniqueColors = new Hashtable(maximumColors);
// actual colors is probably nowhere near maximum, so dont try to initialize the hashtable
Hashtable uniqueColors = new Hashtable();
int sourcePosition = 0;
int numPixels = bmp.info.infoHeader.biHeight * bmp.info.infoHeader.biWidth;
byte[] indexedImage = new byte[numPixels];
byte colorIndex;
if (mapColors)
{
for (int i = 0; i < indexedImage.Length; i++)
{
//TODO: currently assumes source bitmap is 24bit color
//read 3 bytes, convert to color
byte[] pixel = new byte[3];
Array.Copy(bmp.imageData, sourcePosition, pixel, 0, 3);
sourcePosition += 3;
RGBQUAD color = new RGBQUAD(pixel);
if (uniqueColors.Contains(color))
{
colorIndex = Convert.ToByte(uniqueColors[color]);
}
else
{
if (uniqueColors.Count > byte.MaxValue)
{
throw new NotSupportedException(String.Format("The source image contains more than {0} colors.", byte.MaxValue));
}
colorIndex = Convert.ToByte(uniqueColors.Count);
uniqueColors.Add(color, colorIndex);
}
// store pixel as an index into the color table
indexedImage[i] = colorIndex;
}
}
else
{
// added by Pavel Janda on 14/11/2006
if (bmp.info.infoHeader.biBitCount == 32)
{
for (int i = 0; i < indexedImage.Length; i++)
{
//TODO: currently assumes source bitmap is 32bit color with alpha set to zero
//ignore first byte, read another 3 bytes, convert to color
byte[] pixel = new byte[4];
Array.Copy(bmp.imageData, sourcePosition, pixel, 0, 4);
sourcePosition += 4;
RGBQUAD color = new RGBQUAD(pixel[0], pixel[1], pixel[2], pixel[3]);
if (uniqueColors.Contains(color))
{
colorIndex = Convert.ToByte(uniqueColors[color]);
}
else
{
if (uniqueColors.Count > byte.MaxValue)
{
throw new NotSupportedException(String.Format("The source image contains more than {0} colors.", byte.MaxValue));
}
colorIndex = Convert.ToByte(uniqueColors.Count);
uniqueColors.Add(color, colorIndex);
}
// store pixel as an index into the color table
indexedImage[i] = colorIndex;
}
// end of addition
}
else
{
//TODO: implement converting an indexed bitmap
throw new NotImplementedException("Unable to convert indexed bitmaps.");
}
}
ushort bitCount = getBitCount(uniqueColors.Count);
// *** Build Icon ***
IconHolder ico = new IconHolder();
ico.iconDirectory.Entries = new ICONDIRENTRY[1];
//TODO: is it really safe to assume the bitmap width/height are bytes?
ico.iconDirectory.Entries[0].Width = (byte)bmp.info.infoHeader.biWidth;
ico.iconDirectory.Entries[0].Height = (byte)bmp.info.infoHeader.biHeight;
ico.iconDirectory.Entries[0].BitCount = bitCount; // maybe 0?
ico.iconDirectory.Entries[0].ColorCount = (uniqueColors.Count > byte.MaxValue) ? (byte)0 : (byte)uniqueColors.Count;
//HACK: safe to assume that the first imageoffset is always 22
ico.iconDirectory.Entries[0].ImageOffset = 22;
ico.iconDirectory.Entries[0].Planes = 0;
ico.iconImages[0].Header.biBitCount = bitCount;
ico.iconImages[0].Header.biWidth = ico.iconDirectory.Entries[0].Width;
// height is doubled in header, to account for XOR and AND
ico.iconImages[0].Header.biHeight = ico.iconDirectory.Entries[0].Height << 1;
ico.iconImages[0].XOR = new byte[ico.iconImages[0].numBytesInXor()];
ico.iconImages[0].AND = new byte[ico.iconImages[0].numBytesInAnd()];
ico.iconImages[0].Header.biSize = 40; // always
ico.iconImages[0].Header.biSizeImage = (uint)ico.iconImages[0].XOR.Length;
ico.iconImages[0].Header.biPlanes = 1;
ico.iconImages[0].Colors = buildColorTable(uniqueColors, bitCount);
//BytesInRes = biSize + colors * 4 + XOR + AND
ico.iconDirectory.Entries[0].BytesInRes = (uint)(ico.iconImages[0].Header.biSize
+ (ico.iconImages[0].Colors.Length * 4)
+ ico.iconImages[0].XOR.Length
+ ico.iconImages[0].AND.Length);
// copy image data
int bytePosXOR = 0;
int bytePosAND = 0;
byte transparentIndex = 0;
transparentIndex = indexedImage[0];
//initialize AND
ico.iconImages[0].AND[0] = byte.MaxValue;
int pixelsPerByte;
int bytesPerRow; // must be a long boundary (multiple of 4)
int[] shiftCounts;
switch (bitCount)
{
case 1:
pixelsPerByte = 8;
shiftCounts = new int[] { 7, 6, 5, 4, 3, 2, 1, 0 };
break;
case 4:
pixelsPerByte = 2;
shiftCounts = new int[] { 4, 0 };
break;
case 8:
pixelsPerByte = 1;
shiftCounts = new int[] { 0 };
break;
default:
throw new NotSupportedException("Bits per pixel must be 1, 4, or 8");
}
bytesPerRow = ico.iconDirectory.Entries[0].Width / pixelsPerByte;
int padBytes = bytesPerRow % 4;
if (padBytes > 0)
{
padBytes = 4 - padBytes;
}
byte currentByte;
sourcePosition = 0;
for (int row = 0; row < ico.iconDirectory.Entries[0].Height; ++row)
{
for (int rowByte = 0; rowByte < bytesPerRow; ++rowByte)
{
currentByte = 0;
for (int pixel = 0; pixel < pixelsPerByte; ++pixel)
{
byte index = indexedImage[sourcePosition++];
byte shiftedIndex = (byte)(index << shiftCounts[pixel]);
currentByte |= shiftedIndex;
}
ico.iconImages[0].XOR[bytePosXOR] = currentByte;
++bytePosXOR;
}
// make sure each scan line ends on a long boundary
bytePosXOR += padBytes;
}
for (int i = 0; i < indexedImage.Length; i++)
{
byte index = indexedImage[i];
int bitPosAND = 128 >> (i % 8);
if (index != transparentIndex)
{
ico.iconImages[0].AND[bytePosAND] ^= (byte)bitPosAND;
}
if (bitPosAND == 1)
{
// need to start another byte for next pixel
if (bytePosAND % 2 == 1)
{
//TODO: fix assumption that icon is 16px wide
//skip some bytes so that scanline ends on a long barrier
bytePosAND += 3;
}
else
{
bytePosAND += 1;
}
if (bytePosAND < ico.iconImages[0].AND.Length)
{
ico.iconImages[0].AND[bytePosAND] = byte.MaxValue;
}
}
}
return(ico);
}
public static IconHolder BitmapToIconHolder(BitmapHolder bmp)
{
bool mapColors = (bmp.info.infoHeader.biBitCount <= 24);
int maximumColors = 1 << bmp.info.infoHeader.biBitCount;
//Hashtable uniqueColors = new Hashtable(maximumColors);
// actual colors is probably nowhere near maximum, so dont try to initialize the hashtable
Hashtable uniqueColors = new Hashtable();
int sourcePosition = 0;
int numPixels = bmp.info.infoHeader.biHeight * bmp.info.infoHeader.biWidth;
byte[] indexedImage = new byte[numPixels];
byte colorIndex;
if (mapColors)
{
for (int i=0; i < indexedImage.Length; i++)
{
//TODO: currently assumes source bitmap is 24bit color
//read 3 bytes, convert to color
byte[] pixel = new byte[3];
Array.Copy(bmp.imageData, sourcePosition, pixel, 0, 3);
sourcePosition += 3;
RGBQUAD color = new RGBQUAD(pixel);
if (uniqueColors.Contains(color))
{
colorIndex = Convert.ToByte(uniqueColors[color]);
}
else
{
if (uniqueColors.Count > byte.MaxValue)
{
throw new NotSupportedException(String.Format("The source image contains more than {0} colors.", byte.MaxValue));
}
colorIndex = Convert.ToByte(uniqueColors.Count);
uniqueColors.Add(color, colorIndex);
}
// store pixel as an index into the color table
indexedImage[i] = colorIndex;
}
}
else
{
// added by Pavel Janda on 14/11/2006
if (bmp.info.infoHeader.biBitCount == 32)
{
for (int i=0; i < indexedImage.Length; i++)
{
//TODO: currently assumes source bitmap is 32bit color with alpha set to zero
//ignore first byte, read another 3 bytes, convert to color
byte[] pixel = new byte[4];
Array.Copy(bmp.imageData, sourcePosition, pixel, 0, 4);
sourcePosition += 4;
RGBQUAD color = new RGBQUAD(pixel[0], pixel[1], pixel[2], pixel[3]);
if (uniqueColors.Contains(color))
{
colorIndex = Convert.ToByte(uniqueColors[color]);
}
else
{
if (uniqueColors.Count > byte.MaxValue)
{
throw new NotSupportedException(String.Format("The source image contains more than {0} colors.", byte.MaxValue));
}
colorIndex = Convert.ToByte(uniqueColors.Count);
uniqueColors.Add(color, colorIndex);
}
// store pixel as an index into the color table
indexedImage[i] = colorIndex;
}
// end of addition
}
else
{
//TODO: implement converting an indexed bitmap
throw new NotImplementedException("Unable to convert indexed bitmaps.");
}
}
ushort bitCount = getBitCount(uniqueColors.Count);
// *** Build Icon ***
IconHolder ico = new IconHolder();
ico.iconDirectory.Entries = new ICONDIRENTRY[1];
//TODO: is it really safe to assume the bitmap width/height are bytes?
ico.iconDirectory.Entries[0].Width = (byte) bmp.info.infoHeader.biWidth;
ico.iconDirectory.Entries[0].Height = (byte) bmp.info.infoHeader.biHeight;
ico.iconDirectory.Entries[0].BitCount = bitCount; // maybe 0?
ico.iconDirectory.Entries[0].ColorCount = (uniqueColors.Count > byte.MaxValue) ? (byte)0 : (byte)uniqueColors.Count;
//HACK: safe to assume that the first imageoffset is always 22
ico.iconDirectory.Entries[0].ImageOffset = 22;
ico.iconDirectory.Entries[0].Planes = 0;
ico.iconImages[0].Header.biBitCount = bitCount;
ico.iconImages[0].Header.biWidth = ico.iconDirectory.Entries[0].Width;
// height is doubled in header, to account for XOR and AND
ico.iconImages[0].Header.biHeight = ico.iconDirectory.Entries[0].Height << 1;
ico.iconImages[0].XOR = new byte[ico.iconImages[0].numBytesInXor()];
ico.iconImages[0].AND = new byte[ico.iconImages[0].numBytesInAnd()];
ico.iconImages[0].Header.biSize = 40; // always
ico.iconImages[0].Header.biSizeImage = (uint)ico.iconImages[0].XOR.Length;
ico.iconImages[0].Header.biPlanes = 1;
ico.iconImages[0].Colors = buildColorTable(uniqueColors, bitCount);
//BytesInRes = biSize + colors * 4 + XOR + AND
ico.iconDirectory.Entries[0].BytesInRes = (uint)(ico.iconImages[0].Header.biSize
+ (ico.iconImages[0].Colors.Length * 4)
+ ico.iconImages[0].XOR.Length
+ ico.iconImages[0].AND.Length);
// copy image data
int bytePosXOR = 0;
int bytePosAND = 0;
byte transparentIndex = 0;
transparentIndex = indexedImage[0];
//initialize AND
ico.iconImages[0].AND[0] = byte.MaxValue;
int pixelsPerByte;
int bytesPerRow; // must be a long boundary (multiple of 4)
int[] shiftCounts;
switch (bitCount)
{
case 1:
pixelsPerByte = 8;
shiftCounts = new int[] {7, 6, 5, 4, 3, 2, 1, 0};
break;
case 4:
pixelsPerByte = 2;
shiftCounts = new int[] {4, 0};
break;
case 8:
pixelsPerByte = 1;
shiftCounts = new int[] {0};
break;
default:
throw new NotSupportedException("Bits per pixel must be 1, 4, or 8");
}
bytesPerRow = ico.iconDirectory.Entries[0].Width / pixelsPerByte;
int padBytes = bytesPerRow % 4;
if (padBytes > 0)
padBytes = 4 - padBytes;
byte currentByte;
sourcePosition = 0;
for (int row=0; row < ico.iconDirectory.Entries[0].Height; ++row)
{
for (int rowByte=0; rowByte < bytesPerRow; ++rowByte)
{
currentByte = 0;
for (int pixel=0; pixel < pixelsPerByte; ++pixel)
{
byte index = indexedImage[sourcePosition++];
byte shiftedIndex = (byte)(index << shiftCounts[pixel]);
currentByte |= shiftedIndex;
}
ico.iconImages[0].XOR[bytePosXOR] = currentByte;
++bytePosXOR;
}
// make sure each scan line ends on a long boundary
bytePosXOR += padBytes;
}
for(int i=0; i<indexedImage.Length; i++)
{
byte index = indexedImage[i];
int bitPosAND = 128 >> (i % 8);
if (index != transparentIndex)
ico.iconImages[0].AND[bytePosAND] ^= (byte)bitPosAND;
if (bitPosAND == 1)
{
// need to start another byte for next pixel
if (bytePosAND % 2 ==1)
{
//TODO: fix assumption that icon is 16px wide
//skip some bytes so that scanline ends on a long barrier
bytePosAND += 3;
}
else
{
bytePosAND += 1;
}
if (bytePosAND < ico.iconImages[0].AND.Length)
ico.iconImages[0].AND[bytePosAND] = byte.MaxValue;
}
}
return ico;
}
