public static void SaveImage(Stream stream, FreeImageBitmap bitmap)
{
string comment = bitmap.Comment;
var pmsHeader = new PmsHeader();
bool readComment = false;
if (!string.IsNullOrEmpty(comment))
{
if (pmsHeader.ParseComment(comment))
{
readComment = true;
}
}
if (pmsHeader.colorDepth == 0)
{
pmsHeader.colorDepth = 8;
}
bool is8Bit = !readComment || pmsHeader.colorDepth == 8;
if (!readComment)
{
pmsHeader.version = 1;
pmsHeader.headerSize = 48;
}
if (pmsHeader.signature == 0)
{
pmsHeader.signature = 0x00004d50;
}
if (pmsHeader.version == 2 && pmsHeader.headerSize == 0)
{
pmsHeader.headerSize = 64;
}
if (pmsHeader.headerSize < 48)
{
pmsHeader.headerSize = 48;
}
if (pmsHeader.headerSize > 64)
{
pmsHeader.headerSize = 64;
}
pmsHeader.addressOfComment = 0;
pmsHeader.height = bitmap.Height;
pmsHeader.width = bitmap.Width;
if (is8Bit)
{
if (bitmap.ColorDepth > 8)
{
if (bitmap.ColorDepth == 32)
{
bitmap.ConvertColorDepth(FREE_IMAGE_COLOR_DEPTH.FICD_24_BPP);
}
bitmap.Quantize(FREE_IMAGE_QUANTIZE.FIQ_WUQUANT, 256);
//throw new ArgumentException("image must be 8-bit");
}
pmsHeader.addressOfPalette = pmsHeader.headerSize;
pmsHeader.addressOfData = pmsHeader.addressOfPalette + 768;
pmsHeader.colorDepth = 8;
SaveHeader(stream, pmsHeader);
SavePalette(stream, bitmap.Palette);
SaveImageData8Bit(stream, bitmap);
}
else
{
bool hasAlphaChannel = false;
var existingAlphaChannel = bitmap.GetChannel(FREE_IMAGE_COLOR_CHANNEL.FICC_ALPHA);
if (existingAlphaChannel != null)
{
bool allPixelsOpaque = AllPixelsOpaque(existingAlphaChannel);
hasAlphaChannel = !allPixelsOpaque;
}
if (bitmap.ColorDepth != 32)
{
bitmap.ConvertColorDepth(FREE_IMAGE_COLOR_DEPTH.FICD_32_BPP);
}
bool usingAlphaChannel = pmsHeader.shadowDepth == 8 || (pmsHeader.shadowDepth == 0 && hasAlphaChannel);
pmsHeader.addressOfPalette = 0;
pmsHeader.addressOfData = pmsHeader.headerSize;
pmsHeader.colorDepth = 16;
ushort[] image16 = new ushort[pmsHeader.width * pmsHeader.height];
byte[] image8 = null;
if (usingAlphaChannel)
{
image8 = new byte[pmsHeader.width * pmsHeader.height];
}
int o = 0;
for (int y = 0; y < pmsHeader.height; y++)
{
var scanline = bitmap.GetScanlineFromTop32Bit(y);
if (image8 == null)
{
for (int x = 0; x < pmsHeader.width; x++)
{
unchecked
{
int p = scanline[x];
int b = (p >> 0) & 0xFF;
int g = (p >> 8) & 0xFF;
int r = (p >> 16) & 0xFF;
//int a = (p >> 24) & 0xFF;
b = (b * 0x1F1F + 0x8000) >> 16;
g = (g * 0x3F3F + 0x8000) >> 16;
r = (r * 0x1F1F + 0x8000) >> 16;
p = (b << 0) |
(g << 5) |
(r << 11);
image16[o] = (ushort)p;
o++;
}
}
}
else
{
for (int x = 0; x < pmsHeader.width; x++)
{
unchecked
{
int p = scanline[x];
int b = (p >> 0) & 0xFF;
int g = (p >> 8) & 0xFF;
int r = (p >> 16) & 0xFF;
int a = (p >> 24) & 0xFF;
b = (b * 0x1F1F + 0x8000) >> 16;
g = (g * 0x3F3F + 0x8000) >> 16;
r = (r * 0x1F1F + 0x8000) >> 16;
p = (b << 0) |
(g << 5) |
(r << 11);
image16[o] = (ushort)p;
image8[o] = (byte)a;
o++;
}
}
}
}
MemoryStream ms = new MemoryStream();
SaveImageData16Bit(ms, image16, pmsHeader.width, pmsHeader.height);
int imageSize = (int)ms.Length;
if (usingAlphaChannel)
{
pmsHeader.addressOfPalette = imageSize + pmsHeader.addressOfData;
}
SaveHeader(stream, pmsHeader);
ms.WriteTo(stream);
ms.SetLength(0);
if (usingAlphaChannel)
{
SaveImageData8Bit(stream, image8, pmsHeader.width, pmsHeader.height);
}
}
}