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WIP to avoid seekg/tellg

This commit is contained in:
Andreas Fabri 2020-11-25 07:59:16 +00:00
parent e76cc00c4f
commit b16249b99a
1 changed files with 95 additions and 0 deletions
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95
Stream_support/include/CGAL/IO/OFF/File_scanner_OFF.h
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@ -34,6 +34,9 @@ namespace CGAL {
class File_scanner_OFF
: public File_header_OFF
{
std::vector<double> entries;
int color_entries;
int first_color_index;
std::istream& m_in;
bool normals_read;
bool eol_reached;
@ -120,6 +123,7 @@ public:
else
{
skip_comment();
if(!(m_in >> iformat(x) >> iformat(y) >> iformat(z)))
{
m_in.clear(std::ios::badbit);
@ -265,6 +269,57 @@ public:
else
{
skip_comment();
std::string line;
std::getline(m_in, line);
// First remove the comment if there is one
std::size_t pos = line.find('#');
if(pos != std::string::npos){
line = line.substr(0,pos);
}
// Read all numbers in the line
std::istringstream issline(line);
entries.clear();
double d;
while(issline >> iformat(d)){
entries.push_back(d);
}
if(has_colors()){
// Compute how many entries are there for the color
// We might do this only once if we assume that it is the same for all lines
int H = (is_homogeneous())? 1:0;
first_color_index = 3 + H;
color_entries = entries.size();
color_entries -= 3 + H; // coordinates
if(has_normals()){
first_color_index += 3 + H;
color_entries -= 3 + H;
}
if(has_textures()){
color_entries -= 2 + H;
}
// now color_entries should be 1, 3, or 4 for the color
}
// todo: error checking
if(entries.size() < 3){
// error: not enough for x y z
}
x = entries[0];
y = entries[1];
z = entries[2];
if(is_homogeneous()){
if(entries.size() < 4){
// error: no w
}
x /= entries[3];
y /= entries[3];
z /= entries[3];
}
if(!(m_in >> iformat(x) >> iformat(y) >> iformat(z)))
{
m_in.clear(std::ios::badbit);
@ -420,6 +475,15 @@ public:
}
else
{
int first_texture_index = first_color_index + color_entries;
x = entries[first_texture_index];
x = entries[first_texture_index+1];
if(is_homogeneous()){
x /= entries[first_texture_index+2];
y /= entries[first_texture_index+2];
}
if(is_homogeneous())
{
float fx, fy, fw;
@ -520,6 +584,19 @@ public:
}
else
{
if(is_homogeneous()){
if(entries.size() < 8){
// not enough data
}
x = entries[4]/entries[7];
y = entries[5]/entries[7];
z = entries[6]/entries[7];
}else{
x = entries[3];
y = entries[4];
z = entries[5];
}
if(is_homogeneous())
{
float fx, fy, fz, fw;
@ -996,6 +1073,24 @@ public:
}
else
{
if(color_entries == 1){
int i = entries[first_color_index]; // the index in the color map
}
double rd = entries[first_color_index];
double gd = entries[first_color_index + 1];
double bd = entries[first_color_index + 2];
if( (floor(rd) == rd) && (floor(gd) == gd) && (floor(bd) == bd)){
// we have to do with integers
}else{
// we have to do with floats
}
if(color_entries == 4){
double alphad = entries[first_color_index + 3];
// it seems that we ignore it.
}
CGAL::Color color = get_color_from_line(m_in, eol_reached);
r = color.red();
g = color.green();