bool wxGIFHandler::DoSaveFile(const wxImage& image, wxOutputStream *stream,
bool WXUNUSED(verbose), bool first, int delayMilliSecs, bool loop,
const wxRGB *pal, int palCount, int maskIndex)
{
const unsigned long colorcount = image.CountColours(256+1);
bool ok = colorcount && (colorcount <= 256);
if (!ok)
{
return false;
}
int width = image.GetWidth();
int height = image.GetHeight();
wxCHECK_MSG( width && height, false, wxS("can't save 0-sized file") );
int width_even = width + ((width % 2) ? 1 : 0);
if (first)
{
ok = wxGIFHandler_WriteHeader(stream, width, height, loop,
pal, palCount);
}
ok = ok
&& wxGIFHandler_WriteComment(stream,
image.GetOption(wxIMAGE_OPTION_GIF_COMMENT))
&& wxGIFHandler_WriteControl(stream, maskIndex, delayMilliSecs)
&& wxGIFHandler_WriteByte(stream, GIF_MARKER_SEP)
&& wxGIFHandler_WriteRect(stream, width, height);
// local palette
if (first)
{
// we already saved the (global) palette
ok = ok && wxGIFHandler_WriteZero(stream);
}
else
{
const int bpp = wxGIFHandler_BitSize(palCount);
wxUint8 b;
b = 0x80;
b |=(bpp - 1) << 5;
b |=(bpp - 1);
b &=~0x40; // clear interlaced
ok = ok && wxGIFHandler_WriteByte(stream, b)
&& wxGIFHandler_WritePalette(stream, pal, palCount, bpp);
}
if (!ok)
{
return false;
}
if (!InitHashTable())
{
wxLogError(_("Couldn't initialize GIF hash table."));
return false;
}
const wxUint8 *src = image.GetData();
wxScopedArray<wxUint8> eightBitData(width);
SetupCompress(stream, 8);
m_pixelCount = height * width_even;
for (int y = 0; y < height; y++)
{
m_pixelCount -= width_even;
for (int x = 0; x < width; x++)
{
wxRGB rgb;
rgb.red = src[0];
rgb.green = src[1];
rgb.blue = src[2];
int index = wxGIFHandler_PaletteFind(rgb, pal, palCount);
wxASSERT(index != wxNOT_FOUND);
eightBitData[x] = (wxUint8)index;
src+=3;
}
ok = CompressLine(stream, eightBitData.get(), width);
if (!ok)
{
break;
}
}
wxDELETE(m_hashTable);
return ok;
}
