double bisection(double (*func)(double), double x_l , double x_r){
//make sure x's always bracket root
if(bracketed((*func)(x_l), (*func)(x_r))){
//return when four digits or precision are recieved
if(fabs(x_r - x_l) < (1/pow(10.0,4.0))){return (x_l + x_r)/2.0; }
double x_n = (x_r + x_l)/2.0;
//reccur
if(bracketed( (*func)(x_l), (*func)(x_n) )){
bisection((*func), x_l, x_n);
}else{
bisection((*func), x_n, x_r);
}
}else{
printf("Something went wrong no longer bracketed\n");
return 0.0;
}
}
void gen_aux(const Grammar& g, const std::string& word, std::list<std::string>& ret)
{
if(!bracketed(word)) {
ret.push_back(word);
}
else {
Grammar::const_iterator it = g.find(word);
if(it == g.end())
throw std::logic_error("empty rule");
const Rule_collection& c = it->second;
const Rule& r = c[nrand(c.size())];
for(Rule::const_iterator i = r.begin(); i != r.end(); ++i)
gen_aux(g, *i, ret);
}
}
void
gen_aux (const Grammar &g, const std::string &start, std::vector<std::string> &result)
{
TokenStack lifo;
expand_aux (g, start, lifo);
while (!lifo.empty())
{
const std::string curr_word = lifo.top();
lifo.pop();
if (!bracketed (curr_word))
{
result.push_back (curr_word);
}
else
{
expand_aux (g, curr_word, lifo);
}
}
}
void
gen_aux (const Grammar &g, const std::string &word, std::vector<std::string> &result)
{
if (!bracketed (word))
{
result.push_back (word);
}
else
{
Grammar::const_iterator it = g.find (word);
if (g.end() == it)
throw std::logic_error ("empty grammar rule");
const RuleCollection &rc = it->second;
const Rule &r = rc[nrand(rc.size())];
for (Rule::const_iterator r_it = r.begin(); r_it != r.end(); ++r_it)
gen_aux (g, *r_it, result);
}
}
void gen_aux(const Grammar& g, const std::string& word, std::vector<std::string>& ret)
{
if (!bracketed(word)) {
ret.push_back(word);
}
else {
Grammar::const_iterator it = g.find(word);
if (it == g.end()) {
std::logic_error("Rule is empty");
}
// get rule collection from grammar
const Rule_collection& c = it->second;
// select a new rule from collection at random
const Rule& r = c[nrand(c.size())];
// expand rule
for (Rule::const_iterator i = r.begin(); i != r.end(); ++i) {
gen_aux(g, *i, ret);
}
}
}
static Bitmap read_bmp_or_throw(const FilePath& filePath){
BinaryReader in(filePath);
if (!in.good()){
throw ReadBmpError(error_open_file_read(filePath));
}
auto bitmapFileHeader = read_struct_or_throw_bmp<BitmapFileHeader>(in);
if (bitmapFileHeader.fileType != BITMAP_SIGNATURE){
throw ReadBmpError(error_bitmap_signature(bitmapFileHeader.fileType));
}
auto bitmapInfoHeader = read_struct_or_throw_bmp<BitmapInfoHeader>(in);
if (invalid_header_length(bitmapInfoHeader.headerLen)){
throw ReadBmpError(error_truncated_bmp_header(bitmapInfoHeader.headerLen));
}
if (bitmapInfoHeader.compression != Compression::BI_RGB){
throw ReadBmpError(error_compression(bitmapInfoHeader.compression));
}
if (bitmapInfoHeader.colorPlanes != 1){
throw ReadBmpError(error_color_planes(bitmapInfoHeader.colorPlanes));
}
auto bmpSize = get_size_and_order(bitmapInfoHeader);
if (bitmapInfoHeader.paletteColors != 0){
if (bitmapInfoHeader.bitsPerPixel != 8){ // Fixme: Maybe support?
throw ReadBmpError("Palette for non 8-bpp bitmaps unsupported by Faint.");
}
auto colorList = or_throw(read_color_table(in, bitmapInfoHeader.paletteColors),
"Failed reading color table.");
in.seekg(bitmapFileHeader.dataOffset);
auto alphaMap = or_throw(read_8bipp_BI_RGB(in, bmpSize),
"Failed reading 8-bits-per-pixel data");
return bitmap_from_indexed_colors(alphaMap, colorList);
}
else{
// No palette
in.seekg(bitmapFileHeader.dataOffset);
if (bitmapInfoHeader.bitsPerPixel == 8){
auto alphaMap = or_throw(read_8bipp_BI_RGB(in, bmpSize),
"Failed reading 8-bits-per-pixel data");
return bitmap_from_indexed_colors(alphaMap, grayscale_color_table());
}
else if (bitmapInfoHeader.bitsPerPixel == 24){
return or_throw(read_24bipp_BI_RGB(in, bmpSize),
"Failed reading 24-bits-per-pixel data.");
}
else if (bitmapInfoHeader.bitsPerPixel == 32){
return or_throw(read_32bipp_BI_RGB(in, bmpSize),
"Failed reading 32-bits-per-pixel data.");
}
}
throw ReadBmpError(Sentence("Unsupported bits-per-pixel",
bracketed(str_int(bitmapInfoHeader.bitsPerPixel))));
}
