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);
}
}
/**
* BmpImage::serialize
* The method will create a byte stream out of the BMP image object,
* stream that can be later written to file as raw bitmap image.
*/
ByteBuffer* BmpImage::serialize()
{
if (fileType == 0)
return NULL;
ByteBuffer* img = new ByteBuffer(this->fileSize);
// write the file header
*img << fileType;
*img << fileSize;
*img << Xhot;
*img << Yhot;
*img << bitmapOffset;
// the bmp file header
if (version == NOTBMP || version == BMPUNKNOWN)
return NULL;
// add the size of the bmp header
*img << headerSize;
if (version == BMPOLD)
{
// because of the unified treatment
img->addWord((word) width);
img->addWord((word) height);
*img << (word) planes;
*img << (word) bitsPerPixel;
// add the palette
for (int i = 0; i < colorPaletteSize; i++)
{
// suppose to add 3 byte rgb structures
img->addRGB(colorPalette[i]);
}
}
else
{
*img << width;
*img << height;
*img << planes;
*img << bitsPerPixel;
*img << compression;
*img << bitmapSize;
*img << (dword) horizResolution;
*img << (dword) vertResolution;
*img << colorsUsed;
*img << colorsImportant;
if (version == BMPOS2NEW) // OS2 header
{
// add up the rest of the data until 64 bytes
*img << units;
*img << reserved;
*img << recording;
*img << rendering;
*img << size1;
*img << size2;
*img << identifier;
}
if (version == BMPNEWWINV4HDRSIZE)
{
// seek backwards and init to 0 everything
img->seek(BMPFILEHDRSIZE + BMPNEWWINHDRSIZE);
for (int i = BMPFILEHDRSIZE + BMPNEWWINHDRSIZE; i < BMPNEWWINV4HDRSIZE; i++)
{
*img << (byte) 0x00;
}
}
// skip to the color table
printf("\nposition : %d\n", img->getPosition());
printf("length: %d\n", img->getLength());
printf("seek to : %d\n", BMPFILEHDRSIZE + headerSize);
img->seek(BMPFILEHDRSIZE + headerSize);
for (int i = 0; i < colorPaletteSize; i++)
{
*img << colorPalette[i];
}
}
img->seek(bitmapOffset);
for (unsigned int i = 0; i < bitmapSize; i++)
{
*img << bmpBits[i];
}
//img->trimToSize();
return img;
}