void BmpImage::toGrayscale()
{
if (bitsPerPixel != 8 && bitsPerPixel != 24)
return;
int w = rowBytes();
int avg;
if (bitsPerPixel == 24)
{
ByteBuffer* bmpBuffer = new ByteBuffer(bitmapSize, bmpBits);
BinaryReader* reader = new BinaryReader(bmpBuffer);
byte blue, green, red;
for (unsigned int i = 0; i < height; i++)
{
for (unsigned int j = 0; j < width; j++)
{
blue = reader->readByte(i*w+j*3);
green = reader->readByte(i*w+j*3+1);
red = reader->readByte(i*w+j*3+2);
avg = (red + green + blue)/3;
avg = (avg << 16) | (avg << 8) | (avg);
bmpBuffer->seek(i*w+j*3);
bmpBuffer->addRGB(avg);
}
}
bmpBits = bmpBuffer->getBytes();
return;
}
int colorTableIndex;
for (unsigned int i = 0; i < height; i++)
{
for (unsigned int j = 0; j < width; j++)
{
colorTableIndex = bmpBits[i*w+j];
avg = (colorPalette[colorTableIndex] & 0x00FF0000) >> 16;
avg += (colorPalette[colorTableIndex] & 0x0000FF00) >> 8;
avg += (colorPalette[colorTableIndex] & 0x000000FF);
avg /= 3;
bmpBits[i*w+j] = avg;
}
}
for (int k = 0; k < colorPaletteSize; k++)
{
colorPalette[k] = (k << 16) | (k << 8) | (k);
}
}
uint Packet::getMessageLength(ushort lengthType, BinaryReader& reader)
{
uint length = 0;
switch(lengthType)
{
case 1:
length = static_cast<uint>(reader.readByte());
break;
case 2:
length = reader.readUShort();
break;
case 3:
length = static_cast<uint>(
((reader.readByte() & 255) << 16) +
((reader.readByte() & 255) << 8) +
(reader.readByte() & 255));
break;
default:
break;
}
return length;
}
