182 lines
4.8 KiB
C++
182 lines
4.8 KiB
C++
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#include <cctype>
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#include <stdexcept>
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#include <cstdlib>
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#include <map>
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#include <string>
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#include <cstring>
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#include <sstream>
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#include <iomanip>
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#include <cctype>
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#include "Color.h"
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class ColorTable : public std::map<std::string, Color>
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{
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public:
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ColorTable(void)
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{
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map<std::string, Color> &table = *this;
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table["white"] = Color(0xff, 0xff, 0xff);
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table["black"] = Color(0, 0, 0);
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table["gray"] = Color(0x7f, 0x7f, 0x7f);
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table["grey"] = Color(0x7f, 0x7f, 0x7f);
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table["red"] = Color(0xff, 0, 0);
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table["green"] = Color(0, 0xff, 0);
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table["blue"] = Color(0, 0, 0xff);
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table["yellow"] = Color(0xff, 0xff, 0);
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table["magenta"] = Color(0xff, 0, 0xff);
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table["fuchsia"] = Color(0xff, 0, 0xff);
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table["cyan"] = Color(0, 0xff, 0xff);
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table["aqua"] = Color(0, 0xff, 0xff);
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table["orange"] = Color(0xff, 0x7f, 0);
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table["chartreuse"] = Color(0x7f, 0xff, 0);
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table["pink"] = Color(0xff, 0, 0x7f);
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table["violet"] = Color(0x7f, 0, 0xff);
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table["springgreen"] = Color(0, 0xff, 0x7f);
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table["azure"] = Color(0, 0x7f, 0xff);
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table["brown"] = Color(0x7f, 0x3f, 0);
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}
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};
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ColorTable colorTable;
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// alpha:
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// 0: don't expect/allow alpha
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// 1: allow alpha; defaults to 255 (0xff)
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// -1: allow alpha but ignore - set to to 255 (0xff)
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Color::Color(std::string color, int alpha)
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{
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size_t pos = color.find_first_of("+-");
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std::string basecolor = color.substr(0, pos);
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std::string colormod;
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if (pos != std::string::npos)
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colormod = color.substr(pos);
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do {
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if (basecolor[0] != '#') {
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int l = basecolor.length();
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for (int i = 0; i < l; i++)
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basecolor[i] = tolower(basecolor[i]);
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if (colorTable.count(basecolor) > 0) {
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*this = colorTable[basecolor];
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break;
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}
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throw std::runtime_error(std::string("Symbolic color '") + color + "' not known, or color does not begin with #");
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}
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if (std::string::npos != basecolor.find_first_not_of("0123456789abcdefABCDEF",1)) {
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throw std::runtime_error("Color value has invalid digits (expected: [0-9a-zA-Z])");
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}
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if (alpha) {
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if (basecolor.length() != 4 && basecolor.length() != 5 && basecolor.length() != 7 && basecolor.length() != 9)
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throw std::runtime_error(std::string("Color '") + color + "' not in the expected format (#xxx, #xxxx, #xxxxxx or #xxxxxxxx)");
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}
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else {
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if (basecolor.length() == 5 || basecolor.length() == 9)
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throw std::runtime_error(std::string("Color '") + color + "' not in the expected format (#xxx or #xxxxxx) - alpha not allowed");
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if (basecolor.length() != 4 && basecolor.length() != 7)
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throw std::runtime_error(std::string("Color '") + color + "' not in the expected format (#xxx or #xxxxxx)");
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}
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unsigned col = strtoul(basecolor.c_str() + 1, NULL, 16);
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if (basecolor.length() < 6) {
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if (basecolor.length() == 5)
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a = (col >> 12) & 0x0f;
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else
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a = 0x0f;
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a |= a << 4;
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r = (col >> 8) & 0x0f;
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r |= r << 4;
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g = (col >> 4) & 0x0f;
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g |= g << 4;
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b = (col >> 0) & 0x0f;
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b |= b << 4;
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}
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else {
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if (basecolor.length() == 9)
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a = (col >> 24) & 0xff;
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else
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a = 0xff;
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r = (col >> 16) & 0xff;
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g = (col >> 8) & 0xff;
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b = (col >> 0) & 0xff;
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}
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if (alpha <= 0)
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a = 0xff;
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} while(false);
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if (colormod.length() == 0)
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return;
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std::istringstream iss(colormod);
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iss >> std::ws;
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while (!iss.eof()) {
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double w;
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char operation;
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char ccode='w';
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iss >> operation;
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iss >> ccode;
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iss >> w >> std::ws;
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if (w > 1)
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w = w / 255;
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if (!strchr("+-",operation) || !strchr("wkrgbcmy", ccode) || w < 0 || w > 1 || iss.fail())
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throw std::runtime_error(std::string("Invalid color modification(s) (") + color + "); expected one or more of [+-][wkrgbcmy]<n> (n = 0..1)");
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double v;
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if (operation == '+' || operation == '-') {
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// Mix in a color
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int mixr = r;
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int mixg = g;
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int mixb = b;
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if (operation == '+') {
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if (ccode == 'w')
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mixr = mixg = mixb = 255;
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else if (operation == 'k')
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mixr = mixg = mixb = 0;
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else if (ccode == 'r')
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mixr = 255;
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else if (ccode == 'g')
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mixg = 255;
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else if (ccode == 'b')
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mixb = 255;
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else if (ccode == 'c')
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mixg = mixb = 255;
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else if (ccode == 'm')
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mixr = mixb = 255;
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else if (ccode == 'y')
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mixr = mixg = 255;
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}
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else {
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if (ccode == 'w')
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mixr = mixg = mixb = 0;
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else if (operation == 'k')
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mixr = mixg = mixb = 255;
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else if (ccode == 'r')
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mixr = 0;
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else if (ccode == 'g')
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mixg = 0;
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else if (ccode == 'b')
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mixb = 0;
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else if (ccode == 'c')
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mixg = mixb = 0;
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else if (ccode == 'm')
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mixr = mixb = 0;
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else if (ccode == 'y')
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mixr = mixg = 0;
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}
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v = r * (1 - w) + mixr * w;
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if (v < 0) v = 0;
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else if (v > 255) v = 255;
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r = int(v + 0.5);
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v = g * (1 - w) + mixg * w;
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if (v < 0) v = 0;
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else if (v > 255) v = 255;
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g = int(v + 0.5);
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v = b * (1 - w) + mixb * w;
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if (v < 0) v = 0;
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else if (v > 255) v = 255;
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b = int(v + 0.5);
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}
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}
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}
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