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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.2.2/src/ColorSpecialHandler.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.2.2/src/ColorSpecialHandler.cpp | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.2.2/src/ColorSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.2.2/src/ColorSpecialHandler.cpp new file mode 100644 index 00000000000..d156a43770f --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.2.2/src/ColorSpecialHandler.cpp @@ -0,0 +1,269 @@ +/************************************************************************* +** ColorSpecialHandler.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2013 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** This program is free software; you can redistribute it and/or ** +** modify it under the terms of the GNU General Public License as ** +** published by the Free Software Foundation; either version 3 of ** +** the License, or (at your option) any later version. ** +** ** +** This program is distributed in the hope that it will be useful, but ** +** WITHOUT ANY WARRANTY; without even the implied warranty of ** +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** +** GNU General Public License for more details. ** +** ** +** You should have received a copy of the GNU General Public License ** +** along with this program; if not, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#include <algorithm> +#include <cmath> +#include <cstring> +#include <iomanip> +#include <sstream> +#include <vector> +#include "ColorSpecialHandler.h" +#include "SpecialActions.h" + +using namespace std; + + + +/** Approximates a CMYK color by an RGB triple. The component values + * are expected to be normalized, i.e. 0 <= cmyk[i],rgb[j] <= 1. + * @param[in] cmyk color in CMYK space + * @param[out] rgb RGB approximation */ +static void cmyk_to_rgb (const vector<float> &cmyk, vector<float> &rgb) { + for (int i=0; i < 3; i++) + rgb[i] = 1.0f-min(1.0f, cmyk[i]+cmyk[3]); +} + + +/** Converts a color given in HSB coordinates to RGB. + * @param[in] hsb color in HSB space + * @param[out] rgb color in RGB space */ +static void hsb_to_rgb (const vector<float> &hsb, vector<float> &rgb) { + if (hsb[1] == 0) + rgb[0] = rgb[1] = rgb[2] = hsb[2]; + else { + float h = hsb[0]-floor(hsb[0]); + float i = floor(6*h); + float f = 6.0f*h-i; + float p = hsb[2]*(1-hsb[1]); + float q = hsb[2]*(1-hsb[1]*f); + float t = hsb[2]*(1-hsb[1]*(1-f)); + switch (int(i)) { + case 0 : rgb[0]=hsb[2]; rgb[1]=t; rgb[2]=p; break; + case 1 : rgb[0]=q; rgb[1]=hsb[2]; rgb[2]=p; break; + case 2 : rgb[0]=p; rgb[1]=hsb[2]; rgb[2]=t; break; + case 3 : rgb[0]=p; rgb[1]=q; rgb[2]=hsb[2]; break; + case 4 : rgb[0]=t; rgb[1]=p; rgb[2]=hsb[2]; break; + case 5 : rgb[0]=hsb[2]; rgb[1]=p; rgb[2]=q; break; + default: ; // prevent compiler warning + } + } +} + + +/** Converts a gray value to RGB. + * @param[in] gray normalized gray value (0 <= gray <= 1) + * @param[out] rgb resulting RGB triple */ +static void gray_to_rgb (const float gray, vector<float> &rgb) { + for (int i=0; i < 3; i++) + rgb[i] = gray; +} + + +static float read_float (istream &is) { + is.clear(); + float v; + is >> v; + if (is.fail()) + throw SpecialException("number expected"); + return v; +} + + +/** Reads multiple float values from a given stream. The number of + * values read is determined by the size of the result vector. + * @param[in] is stream to be read from + * @param[out] v the resulting floats */ +static void read_floats (istream &is, vector<float> &v) { + for (size_t i=0; i < v.size(); i++) + v[i] = read_float(is); +} + + +static bool color_constant (const string &c, vector<float> &rgb) { + // converted color constants from color.pro + const struct { + const char *name; + const float rgb[3]; + } + constants[] = { + {"Apricot", {1, 0.68f, 0.48f}}, + {"Aquamarine", {0.18f, 1, 0.7f}}, + {"Bittersweet", {0.76f, 0.01f, 0}}, + {"Black", {0, 0, 0}}, + {"Blue", {0, 0, 1}}, + {"BlueGreen", {0.15f, 1, 0.67f}}, + {"BlueViolet", {0.1f, 0.05f, 0.96f}}, + {"BrickRed", {0.72f, 0, 0}}, + {"Brown", {0.4f, 0, 0}}, + {"BurntOrange", {1, 0.49f, 0}}, + {"CadetBlue", {0.38f, 0.43f, 0.77f}}, + {"CarnationPink", {1, 0.37f, 1}}, + {"Cerulean", {0.06f, 0.89f, 1}}, + {"CornflowerBlue", {0.35f, 0.87f, 1}}, + {"Cyan", {0, 1, 1}}, + {"Dandelion", {1, 0.71f, 0.16f}}, + {"DarkOrchid", {0.6f, 0.2f, 0.8f}}, + {"Emerald", {0, 1, 0.5f}}, + {"ForestGreen", {0, 0.88f, 0}}, + {"Fuchsia", {0.45f, 0.01f, 0.92f}}, + {"Goldenrod", {1, 0.9f, 0.16f}}, + {"Gray", {0.5f, 0.5f, 0.5f}}, + {"Green", {0, 1, 0}}, + {"GreenYellow", {0.85f, 1, 0.31f}}, + {"JungleGreen", {0.01f, 1, 0.48f}}, + {"Lavender", {1, 0.52f, 1}}, + {"LimeGreen", {0.5f, 1, 0}}, + {"Magenta", {1, 0, 1}}, + {"Mahogany", {0.65f, 0, 0}}, + {"Maroon", {0.68f, 0, 0}}, + {"Melon", {1, 0.54f, 0.5f}}, + {"MidnightBlue", {0, 0.44f, 0.57f}}, + {"Mulberry", {0.64f, 0.08f, 0.98f}}, + {"NavyBlue", {0.06f, 0.46f, 1}}, + {"OliveGreen", {0, 0.6f, 0}}, + {"Orange", {1, 0.39f, 0.13f}}, + {"OrangeRed", {1, 0, 0.5f}}, + {"Orchid", {0.68f, 0.36f, 1}}, + {"Peach", {1, 0.5f, 0.3f}}, + {"Periwinkle", {0.43f, 0.45f, 1}}, + {"PineGreen", {0, 0.75f, 0.16f}}, + {"Plum", {0.5f, 0, 1}}, + {"ProcessBlue", {0.04f, 1, 1}}, + {"Purple", {0.55f, 0.14f, 1}}, + {"RawSienna", {0.55f, 0, 0}}, + {"Red", {1, 0, 0}}, + {"RedOrange", {1, 0.23f, 0.13f}}, + {"RedViolet", {0.59f, 0, 0.66f}}, + {"Rhodamine", {1, 0.18f, 1}}, + {"RoyalBlue", {0, 0.5f, 1}}, + {"RoyalPurple", {0.25f, 0.1f, 1}}, + {"RubineRed", {1, 0, 0.87f}}, + {"Salmon", {1, 0.47f, 0.62f}}, + {"SeaGreen", {0.31f, 1, 0.5f}}, + {"Sepia", {0.3f, 0, 0}}, + {"SkyBlue", {0.38f, 1, 0.88f}}, + {"SpringGreen", {0.74f, 1, 0.24f}}, + {"Tan", {0.86f, 0.58f, 0.44f}}, + {"TealBlue", {0.12f, 0.98f, 0.64f}}, + {"Thistle", {0.88f, 0.41f, 1}}, + {"Turquoise", {0.15f, 1, 0.8f}}, + {"Violet", {0.21f, 0.12f, 1}}, + {"VioletRed", {1, 0.19f, 1}}, + {"White", {1, 1, 1}}, + {"WildStrawberry", {1, 0.04f, 0.61f}}, + {"Yellow", {1, 1, 0}}, + {"YellowGreen", {0.56f, 1, 0.26f}}, + {"YellowOrange", {1, 0.58f, 0}} + }; + // binary search + int first=0, last=68-1; + while (first <= last) { + int mid = first+(last-first)/2; + int cmp = strcmp(constants[mid].name, c.c_str()); + if (cmp > 0) + last = mid-1; + else if (cmp < 0) + first = mid+1; + else { + rgb[0] = constants[mid].rgb[0]; + rgb[1] = constants[mid].rgb[1]; + rgb[2] = constants[mid].rgb[2]; + return true; + } + } + return false; +} + + +/** Reads a color statement from an input stream and converts it to RGB. + * A color statement has the following syntax: + * <color model> <component values> + * Currently, the following color models are supported: rgb, cmyk, hsb and gray. + * Examples: rgb 1 0.5 0, gray 0.5 + * @param[in] model if model != "" this value specifies the model, otherwise it's read from the stream + * @param[in] is stream to be read from + * @param[out] resulting RGB triple + * @return true if statement has successfully been read */ +static void read_color (string model, istream &is, vector<float> &rgb) { + if (model.empty()) + is >> model; + if (model == "rgb") + read_floats(is, rgb); + else if (model == "cmyk") { + vector<float> cmyk(4); + read_floats(is, cmyk); + cmyk_to_rgb(cmyk, rgb); + } + else if (model == "hsb") { + vector<float> hsb(3); + read_floats(is, hsb); + hsb_to_rgb(hsb, rgb); + } + else if (model == "gray") + gray_to_rgb(read_float(is), rgb); + else if (!color_constant(model, rgb)) + throw SpecialException("unknown color statement"); + if (rgb[0] > 1 || rgb[1] > 1 || rgb[2] > 1) { + ostringstream oss; + oss << "invalid RGB value (" << rgb[0] << ',' << rgb[1] << ',' << rgb[2] << ')'; + throw SpecialException(oss.str()); + } +} + + +bool ColorSpecialHandler::process (const char *prefix, istream &is, SpecialActions *actions) { + vector<float> rgb(3); + if (prefix && strcmp(prefix, "background") == 0) { + read_color("", is, rgb); + actions->setBgColor(rgb); + } + else { + string cmd; + is >> cmd; + if (cmd == "push") { // color push <model> <params> + read_color("", is, rgb); + _colorStack.push(rgb); + } + else if (cmd == "pop") { + if (!_colorStack.empty()) // color pop + _colorStack.pop(); + } + else { // color <model> <params> + read_color(cmd, is, rgb); + while (!_colorStack.empty()) + _colorStack.pop(); + _colorStack.push(rgb); + } + if (actions) { + if (_colorStack.empty()) + actions->setColor(Color::BLACK); + else + actions->setColor(_colorStack.top()); + } + } + return true; +} + + +const char** ColorSpecialHandler::prefixes () const { + static const char *pfx[] = {"color", 0}; + return pfx; +} + |