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color parser

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Zeno Rogue
2024-05-27 12:24:12 +02:00
parent d381caba1f
commit 83575d9d7d
3 changed files with 71 additions and 27 deletions
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78
util.cpp
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@@ -130,6 +130,7 @@ struct exp_parser {
cld parse(int prio = 0);
transmatrix parsematrix(int prio = 0);
color_t parsecolor(int prio = 0);
ld rparse(int prio = 0) { return validate_real(parse(prio)); }
int iparse(int prio = 0) { return int(floor(rparse(prio) + .5)); }
@@ -345,19 +346,6 @@ cld exp_parser::parse(int prio) {
if(real(extra_params["p"]) >= 3.5) res = val0;
else res = val1;
}
else if(eat("rgb(")) {
cld val0 = parse(0);
force_eat(",");
cld val1 = parse(0);
force_eat(",");
cld val2 = parsepar();
switch(int(real(extra_params["p"]) + .5)) {
case 1: res = val0; break;
case 2: res = val1; break;
case 3: res = val2; break;
default: res = 0;
}
}
else if(eat("let(")) {
string name = next_token();
force_eat("=");
@@ -539,6 +527,62 @@ transmatrix exp_parser::parsematrix(int prio) {
return res;
}
color_t part_to_col(array<ld, 4> parts) {
color_t res;
for(int i=0; i<4; i++) {
ld v = parts[i];
if(v < 0) part(res, i) = 0;
else if(v > 1) part(res, i) = 255;
else part(res, i) = int(v * 255 + .5);
}
return res;
}
color_t exp_parser::parsecolor(int prio) {
skip_white();
if(eat("indexed(")) {
int pos = at;
array<ld, 4> parts;
bool have_index = extra_params.count("p");
auto val = extra_params["p"];
for(int i=0; i<4; i++) {
at = pos;
extra_params["p"] = i+1;
parts[i] = rparse();
}
if(!have_index) extra_params.erase("p");
extra_params["p"] = val;
force_eat(")");
return part_to_col(parts);
}
if(eat("rgb(")) {
array<ld, 4> parts;
parts[0] = rparse(); force_eat(",");
parts[1] = rparse(); force_eat(",");
parts[2] = rparse();
if(eat(",")) parts[3] = rparse(); else parts[3] = 1;
force_eat(")");
return part_to_col(parts);
}
if(eat("lerp(")) {
color_t a = parsecolor();
force_eat(",");
color_t b = parsecolor();
force_eat(",");
ld x = rparse();
force_eat(")");
return gradient(a, b, 0, x, 1);
}
string token = next_token();
if(params.count(token)) return (color_t) real(params[token]->get_cld());
if(token == "black") return 0x000000FF;
if(token == "white") return 0xFFFFFFFF;
color_t res;
int qty = sscanf(s.c_str(), "%x", &res);
if(qty == 0) throw hr_parse_exception("color parse error");
return res;
}
EX ld parseld(const string& s) {
exp_parser ep;
ep.s = s;
@@ -551,6 +595,14 @@ EX transmatrix parsematrix(const string& s) {
return ep.parsematrix();
}
EX color_t parsecolor(const string& s, bool has_alpha) {
exp_parser ep;
ep.s = s;
auto col = ep.parsecolor(has_alpha);
if(!has_alpha) col >>= 8;
return col;
}
EX trans23 parsematrix23(const string& s) {
trans23 t;
#if MAXMDIM == 3