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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.2.1/src/Color.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.2.1/src/Color.cpp | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.2.1/src/Color.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.2.1/src/Color.cpp new file mode 100644 index 00000000000..45d5ce453da --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.2.1/src/Color.cpp @@ -0,0 +1,127 @@ +/************************************************************************* +** Color.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 <cmath> +#include <iomanip> +#include <sstream> +#include "Color.h" + +using namespace std; + + + +const Color Color::BLACK(0); +const Color Color::WHITE(UInt8(255), UInt8(255), UInt8(255)); +const Color Color::TRANSPARENT(0xff000000); + + +static inline UInt8 float_to_byte (float v) { + return (UInt8) (floor(255*v+0.5)); +} + + +void Color::set (float r, float g, float b) { + set(float_to_byte(r), float_to_byte(g), float_to_byte(b)); +} + + +void Color::setHSB (float h, float s, float b) { + vector<float> hsb(3), rgb(3); + hsb[0] = h; + hsb[1] = s; + hsb[2] = b; + HSB2RGB(hsb, rgb); + set(rgb[0], rgb[1], rgb[2]); +} + + +void Color::setCMYK (float c, float m, float y, float k) { + vector<float> cmyk(4), rgb(3); + cmyk[0] = c; + cmyk[1] = m; + cmyk[2] = y; + cmyk[3] = k; + CMYK2RGB(cmyk, rgb); + set(rgb[0], rgb[1], rgb[2]); +} + + +void Color::operator *= (double c) { + UInt32 rgb=0; + for (int i=0; i < 3; i++) { + rgb |= UInt32(floor((_rgb & 0xff)*c+0.5)) << (8*i); + _rgb >>= 8; + } + _rgb = rgb; +} + + +string Color::rgbString () const { + ostringstream oss; + oss << '#'; + for (int i=2; i >= 0; i--) { + oss << setbase(16) << setfill('0') << setw(2) + << (((_rgb >> (8*i)) & 0xff)); + } + return oss.str(); +} + + +/** 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 */ +void Color::CMYK2RGB (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 */ +void Color::HSB2RGB (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]); + int i = int(6*h); + float f = float(6.0*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 (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 + } + } +} + + +void Color::getRGB (float &r, float &g, float &b) const { + r = float(((_rgb >> 16) & 255) / 255.0); + g = float(((_rgb >> 8) & 255) / 255.0); + b = float((_rgb & 255) / 255.0); +} |