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Diffstat (limited to 'agg/inc/agg_color_rgba.h')
-rwxr-xr-x | agg/inc/agg_color_rgba.h | 618 |
1 files changed, 618 insertions, 0 deletions
diff --git a/agg/inc/agg_color_rgba.h b/agg/inc/agg_color_rgba.h new file mode 100755 index 000000000000..e1f77206cc66 --- /dev/null +++ b/agg/inc/agg_color_rgba.h @@ -0,0 +1,618 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) +// +// Permission to copy, use, modify, sell and distribute this software +// is granted provided this copyright notice appears in all copies. +// This software is provided "as is" without express or implied +// warranty, and with no claim as to its suitability for any purpose. +// +//---------------------------------------------------------------------------- +// +// Adaptation for high precision colors has been sponsored by +// Liberty Technology Systems, Inc., visit http://lib-sys.com +// +// Liberty Technology Systems, Inc. is the provider of +// PostScript and PDF technology for software developers. +// +//---------------------------------------------------------------------------- +// Contact: mcseem@antigrain.com +// mcseemagg@yahoo.com +// http://www.antigrain.com +//---------------------------------------------------------------------------- + +#ifndef AGG_COLOR_RGBA_INCLUDED +#define AGG_COLOR_RGBA_INCLUDED + +#include <math.h> +#include "agg_basics.h" + +namespace agg +{ + // Supported byte orders for RGB and RGBA pixel formats + //======================================================================= + struct order_rgb { enum { R=0, G=1, B=2, rgb_tag }; }; //----order_rgb + struct order_bgr { enum { B=0, G=1, R=2, rgb_tag }; }; //----order_bgr + struct order_rgba { enum { R=0, G=1, B=2, A=3, rgba_tag }; }; //----order_rgba + struct order_argb { enum { A=0, R=1, G=2, B=3, rgba_tag }; }; //----order_argb + struct order_abgr { enum { A=0, B=1, G=2, R=3, rgba_tag }; }; //----order_abgr + struct order_bgra { enum { B=0, G=1, R=2, A=3, rgba_tag }; }; //----order_bgra + + //====================================================================rgba + struct rgba + { + typedef double value_type; + + double r; + double g; + double b; + double a; + + //-------------------------------------------------------------------- + rgba() {} + + //-------------------------------------------------------------------- + rgba(double r_, double g_, double b_, double a_=1.0) : + r(r_), g(g_), b(b_), a(a_) {} + + //-------------------------------------------------------------------- + rgba(const rgba& c, double a_) : r(c.r), g(c.g), b(c.b), a(a_) {} + + //-------------------------------------------------------------------- + void clear() + { + r = g = b = a = 0; + } + + //-------------------------------------------------------------------- + const rgba& transparent() + { + a = 0.0; + return *this; + } + + //-------------------------------------------------------------------- + const rgba& opacity(double a_) + { + if(a_ < 0.0) a_ = 0.0; + if(a_ > 1.0) a_ = 1.0; + a = a_; + return *this; + } + + //-------------------------------------------------------------------- + double opacity() const + { + return a; + } + + //-------------------------------------------------------------------- + const rgba& premultiply() + { + r *= a; + g *= a; + b *= a; + return *this; + } + + //-------------------------------------------------------------------- + const rgba& premultiply(double a_) + { + if(a <= 0.0 || a_ <= 0.0) + { + r = g = b = a = 0.0; + return *this; + } + a_ /= a; + r *= a_; + g *= a_; + b *= a_; + a = a_; + return *this; + } + + //-------------------------------------------------------------------- + const rgba& demultiply() + { + if(a == 0) + { + r = g = b = 0; + return *this; + } + double a_ = 1.0 / a; + r *= a_; + g *= a_; + b *= a_; + return *this; + } + + + //-------------------------------------------------------------------- + rgba gradient(rgba c, double k) const + { + rgba ret; + ret.r = r + (c.r - r) * k; + ret.g = g + (c.g - g) * k; + ret.b = b + (c.b - b) * k; + ret.a = a + (c.a - a) * k; + return ret; + } + + //-------------------------------------------------------------------- + static rgba no_color() { return rgba(0,0,0,0); } + + //-------------------------------------------------------------------- + static rgba from_wavelength(double wl, double gamma = 1.0); + + //-------------------------------------------------------------------- + rgba(double wavelen, double gamma=1.0) + { + *this = from_wavelength(wavelen, gamma); + } + + }; + + //----------------------------------------------------------------rgba_pre + inline rgba rgba_pre(double r, double g, double b, double a=1.0) + { + return rgba(r, g, b, a).premultiply(); + } + inline rgba rgba_pre(const rgba& c) + { + return rgba(c).premultiply(); + } + inline rgba rgba_pre(const rgba& c, double a) + { + return rgba(c, a).premultiply(); + } + + //------------------------------------------------------------------------ + inline rgba rgba::from_wavelength(double wl, double gamma) + { + rgba t(0.0, 0.0, 0.0); + + if(wl >= 380.0 && wl <= 440.0) + { + t.r = -1.0 * (wl - 440.0) / (440.0 - 380.0); + t.b = 1.0; + } + else + if(wl >= 440.0 && wl <= 490.0) + { + t.g = (wl - 440.0) / (490.0 - 440.0); + t.b = 1.0; + } + else + if(wl >= 490.0 && wl <= 510.0) + { + t.g = 1.0; + t.b = -1.0 * (wl - 510.0) / (510.0 - 490.0); + } + else + if(wl >= 510.0 && wl <= 580.0) + { + t.r = (wl - 510.0) / (580.0 - 510.0); + t.g = 1.0; + } + else + if(wl >= 580.0 && wl <= 645.0) + { + t.r = 1.0; + t.g = -1.0 * (wl - 645.0) / (645.0 - 580.0); + } + else + if(wl >= 645.0 && wl <= 780.0) + { + t.r = 1.0; + } + + double s = 1.0; + if(wl > 700.0) s = 0.3 + 0.7 * (780.0 - wl) / (780.0 - 700.0); + else if(wl < 420.0) s = 0.3 + 0.7 * (wl - 380.0) / (420.0 - 380.0); + + t.r = pow(t.r * s, gamma); + t.g = pow(t.g * s, gamma); + t.b = pow(t.b * s, gamma); + return t; + } + + + + + //===================================================================rgba8 + struct rgba8 + { + typedef int8u value_type; + typedef int32u calc_type; + typedef int32 long_type; + enum + { + base_shift = 8, + base_size = 1 << base_shift, + base_mask = base_size - 1 + }; + typedef rgba8 self_type; + + + value_type r; + value_type g; + value_type b; + value_type a; + + //-------------------------------------------------------------------- + rgba8() {} + + //-------------------------------------------------------------------- + rgba8(unsigned r_, unsigned g_, unsigned b_, unsigned a_=base_mask) : + r(value_type(r_)), + g(value_type(g_)), + b(value_type(b_)), + a(value_type(a_)) {} + + //-------------------------------------------------------------------- + rgba8(const rgba& c, double a_) : + r(value_type(c.r * double(base_mask) + 0.5)), + g(value_type(c.g * double(base_mask) + 0.5)), + b(value_type(c.b * double(base_mask) + 0.5)), + a(value_type(a_ * double(base_mask) + 0.5)) {} + + //-------------------------------------------------------------------- + rgba8(const self_type& c, unsigned a_) : + r(c.r), g(c.g), b(c.b), a(value_type(a_)) {} + + //-------------------------------------------------------------------- + rgba8(const rgba& c) : + r(value_type(c.r * double(base_mask) + 0.5)), + g(value_type(c.g * double(base_mask) + 0.5)), + b(value_type(c.b * double(base_mask) + 0.5)), + a(value_type(c.a * double(base_mask) + 0.5)) {} + + //-------------------------------------------------------------------- + void clear() + { + r = g = b = a = 0; + } + + //-------------------------------------------------------------------- + const self_type& transparent() + { + a = 0; + return *this; + } + + //-------------------------------------------------------------------- + const self_type& opacity(double a_) + { + if(a_ < 0.0) a_ = 0.0; + if(a_ > 1.0) a_ = 1.0; + a = value_type(a_ * double(base_mask) + 0.5); + return *this; + } + + //-------------------------------------------------------------------- + double opacity() const + { + return double(a) / double(base_mask); + } + + //-------------------------------------------------------------------- + const self_type& premultiply() + { + if(a == base_mask) return *this; + if(a == 0) + { + r = g = b = 0; + return *this; + } + r = value_type((calc_type(r) * a) >> base_shift); + g = value_type((calc_type(g) * a) >> base_shift); + b = value_type((calc_type(b) * a) >> base_shift); + return *this; + } + + //-------------------------------------------------------------------- + const self_type& premultiply(unsigned a_) + { + if(a == base_mask && a_ >= base_mask) return *this; + if(a == 0 || a_ == 0) + { + r = g = b = a = 0; + return *this; + } + calc_type r_ = (calc_type(r) * a_) / a; + calc_type g_ = (calc_type(g) * a_) / a; + calc_type b_ = (calc_type(b) * a_) / a; + r = value_type((r_ > a_) ? a_ : r_); + g = value_type((g_ > a_) ? a_ : g_); + b = value_type((b_ > a_) ? a_ : b_); + a = value_type(a_); + return *this; + } + + //-------------------------------------------------------------------- + const self_type& demultiply() + { + if(a == base_mask) return *this; + if(a == 0) + { + r = g = b = 0; + return *this; + } + calc_type r_ = (calc_type(r) * base_mask) / a; + calc_type g_ = (calc_type(g) * base_mask) / a; + calc_type b_ = (calc_type(b) * base_mask) / a; + r = value_type((r_ > base_mask) ? base_mask : r_); + g = value_type((g_ > base_mask) ? base_mask : g_); + b = value_type((b_ > base_mask) ? base_mask : b_); + return *this; + } + + //-------------------------------------------------------------------- + self_type gradient(const self_type& c, double k) const + { + self_type ret; + calc_type ik = calc_type(k * base_size); + ret.r = value_type(calc_type(r) + (((calc_type(c.r) - r) * ik) >> base_shift)); + ret.g = value_type(calc_type(g) + (((calc_type(c.g) - g) * ik) >> base_shift)); + ret.b = value_type(calc_type(b) + (((calc_type(c.b) - b) * ik) >> base_shift)); + ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift)); + return ret; + } + + //-------------------------------------------------------------------- + static self_type no_color() { return self_type(0,0,0,0); } + + //-------------------------------------------------------------------- + static self_type from_wavelength(double wl, double gamma = 1.0) + { + return self_type(rgba::from_wavelength(wl, gamma)); + } + }; + + + //-------------------------------------------------------------rgba8_pre + inline rgba8 rgba8_pre(unsigned r, unsigned g, unsigned b, + unsigned a = rgba8::base_mask) + { + return rgba8(r,g,b,a).premultiply(); + } + inline rgba8 rgba8_pre(const rgba8& c) + { + return rgba8(c).premultiply(); + } + inline rgba8 rgba8_pre(const rgba8& c, unsigned a) + { + return rgba8(c,a).premultiply(); + } + inline rgba8 rgba8_pre(const rgba& c) + { + return rgba8(c).premultiply(); + } + inline rgba8 rgba8_pre(const rgba& c, double a) + { + return rgba8(c,a).premultiply(); + } + + + //-----------------------------------------------------------rgb8_packed + inline rgba8 rgb8_packed(unsigned v) + { + return rgba8((v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF); + } + + //-----------------------------------------------------------bgr8_packed + inline rgba8 bgr8_packed(unsigned v) + { + return rgba8(v & 0xFF, (v >> 8) & 0xFF, (v >> 16) & 0xFF); + } + + //----------------------------------------------------------argb8_packed + inline rgba8 argb8_packed(unsigned v) + { + return rgba8((v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF, v >> 24); + } + + + + + + + + + //=================================================================rgba16 + struct rgba16 + { + typedef int16u value_type; + typedef int32u calc_type; + typedef int64 long_type; + enum + { + base_shift = 16, + base_size = 1 << base_shift, + base_mask = base_size - 1 + }; + typedef rgba16 self_type; + + value_type r; + value_type g; + value_type b; + value_type a; + + //-------------------------------------------------------------------- + rgba16() {} + + //-------------------------------------------------------------------- + rgba16(unsigned r_, unsigned g_, unsigned b_, unsigned a_=base_mask) : + r(value_type(r_)), + g(value_type(g_)), + b(value_type(b_)), + a(value_type(a_)) {} + + //-------------------------------------------------------------------- + rgba16(const self_type& c, unsigned a_) : + r(c.r), g(c.g), b(c.b), a(value_type(a_)) {} + + //-------------------------------------------------------------------- + rgba16(const rgba& c) : + r(value_type(c.r * double(base_mask) + 0.5)), + g(value_type(c.g * double(base_mask) + 0.5)), + b(value_type(c.b * double(base_mask) + 0.5)), + a(value_type(c.a * double(base_mask) + 0.5)) {} + + //-------------------------------------------------------------------- + rgba16(const rgba& c, double a_) : + r(value_type(c.r * double(base_mask) + 0.5)), + g(value_type(c.g * double(base_mask) + 0.5)), + b(value_type(c.b * double(base_mask) + 0.5)), + a(value_type(a_ * double(base_mask) + 0.5)) {} + + //-------------------------------------------------------------------- + rgba16(const rgba8& c) : + r(value_type((value_type(c.r) << 8) | c.r)), + g(value_type((value_type(c.g) << 8) | c.g)), + b(value_type((value_type(c.b) << 8) | c.b)), + a(value_type((value_type(c.a) << 8) | c.a)) {} + + //-------------------------------------------------------------------- + rgba16(const rgba8& c, unsigned a_) : + r(value_type((value_type(c.r) << 8) | c.r)), + g(value_type((value_type(c.g) << 8) | c.g)), + b(value_type((value_type(c.b) << 8) | c.b)), + a(value_type(( a_ << 8) | c.a)) {} + + //-------------------------------------------------------------------- + void clear() + { + r = g = b = a = 0; + } + + //-------------------------------------------------------------------- + const self_type& transparent() + { + a = 0; + return *this; + } + + //-------------------------------------------------------------------- + const self_type& opacity(double a_) + { + if(a_ < 0.0) a_ = 0.0; + if(a_ > 1.0) a_ = 1.0; + a = value_type(a_ * double(base_mask) + 0.5); + return *this; + } + + //-------------------------------------------------------------------- + double opacity() const + { + return double(a) / double(base_mask); + } + + //-------------------------------------------------------------------- + const self_type& premultiply() + { + if(a == base_mask) return *this; + if(a == 0) + { + r = g = b = 0; + return *this; + } + r = value_type((calc_type(r) * a) >> base_shift); + g = value_type((calc_type(g) * a) >> base_shift); + b = value_type((calc_type(b) * a) >> base_shift); + return *this; + } + + //-------------------------------------------------------------------- + const self_type& premultiply(unsigned a_) + { + if(a == base_mask && a_ >= base_mask) return *this; + if(a == 0 || a_ == 0) + { + r = g = b = a = 0; + return *this; + } + calc_type r_ = (calc_type(r) * a_) / a; + calc_type g_ = (calc_type(g) * a_) / a; + calc_type b_ = (calc_type(b) * a_) / a; + r = value_type((r_ > a_) ? a_ : r_); + g = value_type((g_ > a_) ? a_ : g_); + b = value_type((b_ > a_) ? a_ : b_); + a = value_type(a_); + return *this; + } + + //-------------------------------------------------------------------- + const self_type& demultiply() + { + if(a == base_mask) return *this; + if(a == 0) + { + r = g = b = 0; + return *this; + } + calc_type r_ = (calc_type(r) * base_mask) / a; + calc_type g_ = (calc_type(g) * base_mask) / a; + calc_type b_ = (calc_type(b) * base_mask) / a; + r = value_type((r_ > base_mask) ? base_mask : r_); + g = value_type((g_ > base_mask) ? base_mask : g_); + b = value_type((b_ > base_mask) ? base_mask : b_); + return *this; + } + + //-------------------------------------------------------------------- + self_type gradient(const self_type& c, double k) const + { + self_type ret; + calc_type ik = calc_type(k * base_size); + ret.r = value_type(calc_type(r) + (((calc_type(c.r) - r) * ik) >> base_shift)); + ret.g = value_type(calc_type(g) + (((calc_type(c.g) - g) * ik) >> base_shift)); + ret.b = value_type(calc_type(b) + (((calc_type(c.b) - b) * ik) >> base_shift)); + ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift)); + return ret; + } + + //-------------------------------------------------------------------- + static self_type no_color() { return self_type(0,0,0,0); } + + //-------------------------------------------------------------------- + static self_type from_wavelength(double wl, double gamma = 1.0) + { + return self_type(rgba::from_wavelength(wl, gamma)); + } + }; + + + + //--------------------------------------------------------------rgba16_pre + inline rgba16 rgba16_pre(unsigned r, unsigned g, unsigned b, + unsigned a = rgba16::base_mask) + { + return rgba16(r,g,b,a).premultiply(); + } + inline rgba16 rgba16_pre(const rgba16& c, unsigned a) + { + return rgba16(c,a).premultiply(); + } + inline rgba16 rgba16_pre(const rgba& c) + { + return rgba16(c).premultiply(); + } + inline rgba16 rgba16_pre(const rgba& c, double a) + { + return rgba16(c,a).premultiply(); + } + inline rgba16 rgba16_pre(const rgba8& c) + { + return rgba16(c).premultiply(); + } + inline rgba16 rgba16_pre(const rgba8& c, unsigned a) + { + return rgba16(c,a).premultiply(); + } + +} + + + +#endif |