summaryrefslogtreecommitdiffstats
path: root/src/color.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/color.cpp')
-rw-r--r--src/color.cpp496
1 files changed, 496 insertions, 0 deletions
diff --git a/src/color.cpp b/src/color.cpp
new file mode 100644
index 0000000..038609f
--- /dev/null
+++ b/src/color.cpp
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Colors.
+ *
+ * Author:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cmath>
+#include <cstdio>
+#include <vector>
+
+#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
+#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
+
+#include "color.h"
+#include "hsluv.h"
+#include "svg/svg-icc-color.h"
+#include "svg/svg-color.h"
+
+#include "svg/css-ostringstream.h"
+
+#define return_if_fail(x) if (!(x)) { printf("assertion failed: " #x); return; }
+#define return_val_if_fail(x, val) if (!(x)) { printf("assertion failed: " #x); return val; }
+
+using Inkscape::CSSOStringStream;
+
+static bool profileMatches( SVGICCColor const* first, SVGICCColor const* second );
+
+#define PROFILE_EPSILON 0.00000001
+
+SPColor::SPColor() :
+ icc(nullptr)
+{
+ v.c[0] = 0;
+ v.c[1] = 0;
+ v.c[2] = 0;
+}
+
+SPColor::SPColor( SPColor const& other ) :
+ icc(nullptr)
+{
+ *this = other;
+}
+
+SPColor::SPColor( float r, float g, float b ) :
+ icc(nullptr)
+{
+ set( r, g, b );
+}
+
+SPColor::SPColor( guint32 value ) :
+ icc(nullptr)
+{
+ set( value );
+}
+
+SPColor::~SPColor()
+{
+ delete icc;
+ icc = nullptr;
+}
+
+
+SPColor& SPColor::operator= (SPColor const& other)
+{
+ if (this == &other){
+ return *this;
+ }
+
+ SVGICCColor* tmp_icc = other.icc ? new SVGICCColor(*other.icc) : nullptr;
+
+ v.c[0] = other.v.c[0];
+ v.c[1] = other.v.c[1];
+ v.c[2] = other.v.c[2];
+ if ( icc ) {
+ delete icc;
+ }
+ icc = tmp_icc;
+
+ return *this;
+}
+
+
+/**
+ * Returns true if colors match.
+ */
+bool SPColor::operator == (SPColor const& other) const
+{
+ bool match =
+ (v.c[0] == other.v.c[0]) &&
+ (v.c[1] == other.v.c[1]) &&
+ (v.c[2] == other.v.c[2]);
+
+ match &= profileMatches( icc, other.icc );
+
+ return match;
+}
+
+/**
+ * Returns true if no RGB value differs epsilon or more in both colors,
+ * false otherwise.
+ */
+bool SPColor::isClose( SPColor const& other, float epsilon ) const
+{
+ bool match = (fabs((v.c[0]) - (other.v.c[0])) < epsilon)
+ && (fabs((v.c[1]) - (other.v.c[1])) < epsilon)
+ && (fabs((v.c[2]) - (other.v.c[2])) < epsilon);
+
+ match &= profileMatches( icc, other.icc );
+
+ return match;
+}
+
+static bool profileMatches( SVGICCColor const* first, SVGICCColor const* second ) {
+ bool match = false;
+ if ( !first && !second ) {
+ match = true;
+ } else {
+ match = first && second
+ && (first->colorProfile == second->colorProfile)
+ && (first->colors.size() == second->colors.size());
+ if ( match ) {
+ for ( unsigned i = 0; i < first->colors.size(); i++ ) {
+ match &= (fabs(first->colors[i] - second->colors[i]) < PROFILE_EPSILON);
+ }
+ }
+ }
+ return match;
+}
+
+/**
+ * Sets RGB values and colorspace in color.
+ * \pre 0 <={r,g,b}<=1
+ */
+void SPColor::set( float r, float g, float b )
+{
+ return_if_fail(r >= 0.0);
+ return_if_fail(r <= 1.0);
+ return_if_fail(g >= 0.0);
+ return_if_fail(g <= 1.0);
+ return_if_fail(b >= 0.0);
+ return_if_fail(b <= 1.0);
+
+ // TODO clear icc if set?
+ v.c[0] = r;
+ v.c[1] = g;
+ v.c[2] = b;
+}
+
+/**
+ * Converts 32bit value to RGB floats and sets color.
+ */
+void SPColor::set( guint32 value )
+{
+ // TODO clear icc if set?
+ v.c[0] = (value >> 24) / 255.0F;
+ v.c[1] = ((value >> 16) & 0xff) / 255.0F;
+ v.c[2] = ((value >> 8) & 0xff) / 255.0F;
+}
+
+/**
+ * Convert SPColor with integer alpha value to 32bit RGBA value.
+ * \pre alpha < 256
+ */
+guint32 SPColor::toRGBA32( int alpha ) const
+{
+ return_val_if_fail (alpha <= 0xff, 0x0);
+
+ guint32 rgba = SP_RGBA32_U_COMPOSE( SP_COLOR_F_TO_U(v.c[0]),
+ SP_COLOR_F_TO_U(v.c[1]),
+ SP_COLOR_F_TO_U(v.c[2]),
+ alpha );
+ return rgba;
+}
+
+/**
+ * Convert SPColor with float alpha value to 32bit RGBA value.
+ * \pre color != NULL && 0 <= alpha <= 1
+ */
+guint32 SPColor::toRGBA32( double alpha ) const
+{
+ return_val_if_fail(alpha >= 0.0, 0x0);
+ return_val_if_fail(alpha <= 1.0, 0x0);
+
+ return toRGBA32( static_cast<int>(SP_COLOR_F_TO_U(alpha)) );
+}
+
+std::string SPColor::toString() const
+{
+ CSSOStringStream css;
+ char tmp[64] = {0};
+
+ sp_svg_write_color(tmp, sizeof(tmp), toRGBA32(0x0ff));
+ css << tmp;
+
+ if ( icc ) {
+ if ( !css.str().empty() ) {
+ css << " ";
+ }
+ css << "icc-color(" << icc->colorProfile;
+ for (double color : icc->colors) {
+ css << ", " << color;
+ }
+ css << ')';
+ }
+
+ return css.str();
+}
+
+
+/**
+ * Fill rgb float array with values from SPColor.
+ * \pre color != NULL && rgb != NULL && rgb[0-2] is meaningful
+ */
+void
+SPColor::get_rgb_floatv(float *rgb) const
+{
+ return_if_fail (rgb != nullptr);
+
+ rgb[0] = v.c[0];
+ rgb[1] = v.c[1];
+ rgb[2] = v.c[2];
+}
+
+/**
+ * Fill cmyk float array with values from SPColor.
+ * \pre color != NULL && cmyk != NULL && cmyk[0-3] is meaningful
+ */
+void
+SPColor::get_cmyk_floatv(float *cmyk) const
+{
+ return_if_fail (cmyk != nullptr);
+
+ SPColor::rgb_to_cmyk_floatv( cmyk,
+ v.c[0],
+ v.c[1],
+ v.c[2] );
+}
+
+/* Plain mode helpers */
+
+/**
+ * Fill hsv float array from r,g,b float values.
+ */
+void
+SPColor::rgb_to_hsv_floatv (float *hsv, float r, float g, float b)
+{
+ float max, min, delta;
+
+ max = MAX (MAX (r, g), b);
+ min = MIN (MIN (r, g), b);
+ delta = max - min;
+
+ hsv[2] = max;
+
+ if (max > 0) {
+ hsv[1] = delta / max;
+ } else {
+ hsv[1] = 0.0;
+ }
+
+ if (hsv[1] != 0.0) {
+ if (r == max) {
+ hsv[0] = (g - b) / delta;
+ } else if (g == max) {
+ hsv[0] = 2.0 + (b - r) / delta;
+ } else {
+ hsv[0] = 4.0 + (r - g) / delta;
+ }
+
+ hsv[0] = hsv[0] / 6.0;
+
+ if (hsv[0] < 0) hsv[0] += 1.0;
+ }
+ else
+ hsv[0] = 0.0;
+}
+
+/**
+ * Fill rgb float array from h,s,v float values.
+ */
+void
+SPColor::hsv_to_rgb_floatv (float *rgb, float h, float s, float v)
+{
+ double f, w, q, t, d;
+
+ d = h * 5.99999999;
+ f = d - floor (d);
+ w = v * (1.0 - s);
+ q = v * (1.0 - (s * f));
+ t = v * (1.0 - (s * (1.0 - f)));
+
+ if (d < 1.0) {
+ *rgb++ = v;
+ *rgb++ = t;
+ *rgb++ = w;
+ } else if (d < 2.0) {
+ *rgb++ = q;
+ *rgb++ = v;
+ *rgb++ = w;
+ } else if (d < 3.0) {
+ *rgb++ = w;
+ *rgb++ = v;
+ *rgb++ = t;
+ } else if (d < 4.0) {
+ *rgb++ = w;
+ *rgb++ = q;
+ *rgb++ = v;
+ } else if (d < 5.0) {
+ *rgb++ = t;
+ *rgb++ = w;
+ *rgb++ = v;
+ } else {
+ *rgb++ = v;
+ *rgb++ = w;
+ *rgb++ = q;
+ }
+}
+
+/**
+ * Fill hsl float array from r,g,b float values.
+ */
+void
+SPColor::rgb_to_hsl_floatv (float *hsl, float r, float g, float b)
+{
+ float max = MAX (MAX (r, g), b);
+ float min = MIN (MIN (r, g), b);
+ float delta = max - min;
+
+ hsl[2] = (max + min)/2.0;
+
+ if (delta == 0) {
+ hsl[0] = 0;
+ hsl[1] = 0;
+ } else {
+ if (hsl[2] <= 0.5)
+ hsl[1] = delta / (max + min);
+ else
+ hsl[1] = delta / (2 - max - min);
+
+ if (r == max) hsl[0] = (g - b) / delta;
+ else if (g == max) hsl[0] = 2.0 + (b - r) / delta;
+ else if (b == max) hsl[0] = 4.0 + (r - g) / delta;
+
+ hsl[0] = hsl[0] / 6.0;
+
+ if (hsl[0] < 0) hsl[0] += 1;
+ if (hsl[0] > 1) hsl[0] -= 1;
+ }
+}
+
+static float
+hue_2_rgb (float v1, float v2, float h)
+{
+ if (h < 0) h += 6.0;
+ if (h > 6) h -= 6.0;
+
+ if (h < 1) return v1 + (v2 - v1) * h;
+ if (h < 3) return v2;
+ if (h < 4) return v1 + (v2 - v1) * (4 - h);
+ return v1;
+}
+
+/**
+ * Fill rgb float array from h,s,l float values.
+ */
+void
+SPColor::hsl_to_rgb_floatv (float *rgb, float h, float s, float l)
+{
+ if (s == 0) {
+ rgb[0] = l;
+ rgb[1] = l;
+ rgb[2] = l;
+ } else {
+ float v2;
+ if (l < 0.5) {
+ v2 = l * (1 + s);
+ } else {
+ v2 = l + s - l*s;
+ }
+ float v1 = 2*l - v2;
+
+ rgb[0] = hue_2_rgb (v1, v2, h*6 + 2.0);
+ rgb[1] = hue_2_rgb (v1, v2, h*6);
+ rgb[2] = hue_2_rgb (v1, v2, h*6 - 2.0);
+ }
+}
+
+/**
+ * Fill cmyk float array from r,g,b float values.
+ */
+void
+SPColor::rgb_to_cmyk_floatv (float *cmyk, float r, float g, float b)
+{
+ float c, m, y, k, kd;
+
+ c = 1.0 - r;
+ m = 1.0 - g;
+ y = 1.0 - b;
+ k = MIN (MIN (c, m), y);
+
+ c = c - k;
+ m = m - k;
+ y = y - k;
+
+ kd = 1.0 - k;
+
+ if (kd > 1e-9) {
+ c = c / kd;
+ m = m / kd;
+ y = y / kd;
+ }
+
+ cmyk[0] = c;
+ cmyk[1] = m;
+ cmyk[2] = y;
+ cmyk[3] = k;
+}
+
+/**
+ * Fill rgb float array from c,m,y,k float values.
+ */
+void
+SPColor::cmyk_to_rgb_floatv (float *rgb, float c, float m, float y, float k)
+{
+ float kd;
+
+ kd = 1.0 - k;
+
+ c = c * kd;
+ m = m * kd;
+ y = y * kd;
+
+ c = c + k;
+ m = m + k;
+ y = y + k;
+
+ rgb[0] = 1.0 - c;
+ rgb[1] = 1.0 - m;
+ rgb[2] = 1.0 - y;
+}
+
+/**
+ * Fill hsluv float array from r,g,b float values.
+ */
+void
+SPColor::rgb_to_hsluv_floatv (float *hsluv, float r, float g, float b)
+{
+ double h, s, l;
+ Hsluv::rgb_to_hsluv(r, g, b, &h, &s, &l);
+
+ h /= 360.0;
+ s /= 100.0;
+ l /= 100.0;
+
+ hsluv[0] = std::min(1.0, std::max(0.0, h));
+ hsluv[1] = std::min(1.0, std::max(0.0, s));
+ hsluv[2] = std::min(1.0, std::max(0.0, l));
+}
+
+/**
+ * Fill rgb float array from h,s,l float values.
+ */
+void
+SPColor::hsluv_to_rgb_floatv (float *rgb, float h, float s, float l)
+{
+ h *= 360.0;
+ s *= 100.0;
+ l *= 100.0;
+
+ double r, g, b;
+ Hsluv::hsluv_to_rgb(h, s, l, &r, &g, &b);
+
+ rgb[0] = r;
+ rgb[1] = g;
+ rgb[2] = b;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-15 15:54:39 +0000