/// <summary>
/// Reads the specified scanline.
/// </summary>
/// <param name="scanline">The scanline.</param>
/// <param name="pixels">The pixels, where the colors should be stored in RGBA format.</param>
/// <param name="header">The header, which contains information about the png file, like
/// the width of the image and the height.</param>
public void ReadScanline(byte[] scanline, byte[] pixels, PngHeader header)
{
int offset = 0;
byte[] newScanline = PngColorReader.ToArrayByBitsLength(scanline, header.BitDepth);
if (_useAlpha)
{
for (int x = 0; x < header.Width / 2; x++)
{
offset = (_row * header.Width + x) * 4;
pixels[offset + 0] = newScanline[x * 2];
pixels[offset + 1] = newScanline[x * 2];
pixels[offset + 2] = newScanline[x * 2];
pixels[offset + 3] = newScanline[x * 2 + 1];
}
}
else
{
for (int x = 0; x < header.Width; x++)
{
offset = (_row * header.Width + x) * 4;
pixels[offset + 0] = newScanline[x];
pixels[offset + 1] = newScanline[x];
pixels[offset + 2] = newScanline[x];
pixels[offset + 3] = (byte)255;
}
}
_row++;
}
/// <summary>
/// Reads the specified scanline.
/// </summary>
/// <param name="scanline">The scanline.</param>
/// <param name="pixels">The pixels, where the colors should be stored in RGBA format.</param>
/// <param name="header">The header, which contains information about the png file, like
/// the width of the image and the height.</param>
public void ReadScanline(byte[] scanline, byte[] pixels, PngHeader header)
{
int offset = 0;
byte[] newScanline = PngColorReader.ToArrayByBitsLength(scanline, header.BitDepth);
if (_useAlpha)
{
for (int x = 0; x < newScanline.Length; x += 4)
{
offset = (_row * header.Width + (x >> 2)) * 4;
pixels[offset + 0] = newScanline[x + 2];
pixels[offset + 1] = newScanline[x + 1];
pixels[offset + 2] = newScanline[x + 0];
pixels[offset + 3] = newScanline[x + 3];
}
}
else
{
if (header.BitDepth == 8)
{
for (int x = 0; x < newScanline.Length / 3; x++)
{
offset = (_row * header.Width + x) * 4;
pixels[offset + 0] = newScanline[x * 3 + 2];
pixels[offset + 1] = newScanline[x * 3 + 1];
pixels[offset + 2] = newScanline[x * 3 + 0];
pixels[offset + 3] = (byte)255;
}
}
else
{
for (int x = 0; x < newScanline.Length / 6; x++)
{
offset = (_row * header.Width + x) * 4;
pixels[offset + 0] = newScanline[(x * 6 + 4)];
pixels[offset + 1] = newScanline[(x * 6 + 2)];
pixels[offset + 2] = newScanline[(x * 6 + 0)];
pixels[offset + 3] = (byte)255;
}
}
}
_row++;
}
/// <summary>
/// Reads the specified scanline.
/// </summary>
/// <param name="scanline">The scanline.</param>
/// <param name="pixels">The pixels, where the colors should be stored in RGBA format.</param>
/// <param name="header">The header, which contains information about the png file, like
/// the width of the image and the height.</param>
public void ReadScanline(byte[] scanline, byte[] pixels, PngHeader header)
{
byte[] newScanline = PngColorReader.ToArrayByBitsLength(scanline, header.BitDepth);
int offset = 0, index = 0;
if (_paletteAlpha != null && _paletteAlpha.Length > 0)
{
// If the alpha palette is not null and does one or
// more entries, this means, that the image contains and alpha
// channel and we should try to read it.
for (int i = 0; i < header.Width; i++)
{
index = newScanline[i];
offset = (_row * header.Width + i) * 4;
pixels[offset + 0] = _palette[index * 3 + 2];
pixels[offset + 1] = _palette[index * 3 + 1];
pixels[offset + 2] = _palette[index * 3 + 0];
pixels[offset + 3] = _paletteAlpha.Length > index ? _paletteAlpha[index] : (byte)255;
}
}
else
{
for (int i = 0; i < header.Width; i++)
{
index = newScanline[i];
offset = (_row * header.Width + i) * 4;
pixels[offset + 0] = _palette[index * 3 + 2];
pixels[offset + 1] = _palette[index * 3 + 1];
pixels[offset + 2] = _palette[index * 3 + 0];
pixels[offset + 3] = (byte)255;
}
}
_row++;
}
