#include "config.h"
#include "Color.h"
#include "DeprecatedString.h"
#include "PlatformString.h"
#include <wtf/Assertions.h>
#include "ColorData.c"
using namespace std;
namespace WebCore {
RGBA32 makeRGB(int r, int g, int b)
{
return 0xFF000000 | max(0, min(r, 255)) << 16 | max(0, min(g, 255)) << 8 | max(0, min(b, 255));
}
RGBA32 makeRGBA(int r, int g, int b, int a)
{
return max(0, min(a, 255)) << 24 | max(0, min(r, 255)) << 16 | max(0, min(g, 255)) << 8 | max(0, min(b, 255));
}
double calcHue(double temp1, double temp2, double hueVal)
{
if (hueVal < 0)
hueVal++;
else if (hueVal > 1)
hueVal--;
if (hueVal * 6 < 1)
return temp1 + (temp2 - temp1) * hueVal * 6;
if (hueVal * 2 < 1)
return temp2;
if (hueVal * 3 < 2)
return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hueVal) * 6;
return temp1;
}
RGBA32 makeRGBAFromHSLA(double h, double s, double l, double a)
{
double temp2 = l < 0.5 ? l * (1.0 + s) : l + s - l * s;
double temp1 = 2.0 * l - temp2;
return makeRGBA(static_cast<int>(calcHue(temp1, temp2, h + 1.0 / 3.0) * 255),
static_cast<int>(calcHue(temp1, temp2, h) * 255),
static_cast<int>(calcHue(temp1, temp2, h - 1.0 / 3.0) * 255),
static_cast<int>(a * 255));
}
static inline bool parseHexColor(const String& name, RGBA32& rgb)
{
int len = name.length();
if (!len)
return false;
if (len == 3 || len == 6) {
bool ok;
int val = name.deprecatedString().toInt(&ok, 16);
if (ok) {
if (len == 6) {
rgb = 0xFF000000 | val;
return true;
}
rgb = 0xFF000000
| (val & 0xF00) << 12 | (val & 0xF00) << 8
| (val & 0xF0) << 8 | (val & 0xF0) << 4
| (val & 0xF) << 4 | (val & 0xF);
return true;
}
}
return false;
}
int differenceSquared(const Color& c1, const Color& c2)
{
int dR = c1.red() - c2.red();
int dG = c1.green() - c2.green();
int dB = c1.blue() - c2.blue();
return dR * dR + dG * dG + dB * dB;
}
Color::Color(const String& name)
{
if (name.startsWith("#"))
valid = parseHexColor(name.substring(1), color);
else
setNamedColor(name);
}
Color::Color(const char* name)
{
if (name[0] == '#')
valid = parseHexColor(&name[1], color);
else {
const NamedColor* foundColor = findColor(name, strlen(name));
color = foundColor ? foundColor->RGBValue : 0;
color |= 0xFF000000;
valid = foundColor;
}
}
String Color::name() const
{
String name;
if (alpha() < 0xFF)
name = String::sprintf("#%02X%02X%02X%02X", red(), green(), blue(), alpha());
else
name = String::sprintf("#%02X%02X%02X", red(), green(), blue());
return name;
}
void Color::setNamedColor(const String& name)
{
DeprecatedString dname = name.deprecatedString();
const NamedColor* foundColor = dname.isAllASCII() ? findColor(dname.latin1(), dname.length()) : 0;
color = foundColor ? foundColor->RGBValue : 0;
color |= 0xFF000000;
valid = foundColor;
}
const float undefinedHue = -1;
static void convertRGBToHSV(float r, float g, float b, float& h, float& s, float& v)
{
float x = min(r, min(g, b));
v = max(r, max(g, b));
if (v == x) {
h = undefinedHue;
s = 0;
} else {
float f = (r == x) ? g - b : ((g == x) ? b - r : r - g);
int i = (r == x) ? 3 : ((g == x) ? 5 : 1);
h = i - f / (v - x);
if (v != 0)
s = (v - x) / v;
else
s = 0;
}
}
static void convertHSVToRGB(float h, float s, float v, float& r, float& g, float& b)
{
if (h == undefinedHue) {
r = v;
g = v;
b = v;
return;
}
int i = static_cast<int>(h); float f = h - i; if (!(i & 1))
f = 1 - f;
float m = v * (1 - s);
float n = v * (1 - s * f);
switch (i) {
default: r = v;
g = n;
b = m;
break;
case 1:
r = n;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = n;
break;
case 3:
r = m;
g = n;
b = v;
break;
case 4:
r = n;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = n;
break;
}
}
Color Color::light() const
{
float r, g, b, a, h, s, v;
getRGBA(r, g, b, a);
convertRGBToHSV(r, g, b, h, s, v);
v = max(0.0f, min(v + 0.33f, 1.0f));
convertHSVToRGB(h, s, v, r, g, b);
return Color((int)(r * 255), (int)(g * 255), (int)(b * 255), (int)(a * 255));
}
Color Color::dark() const
{
float r, g, b, a, h, s, v;
getRGBA(r, g, b, a);
convertRGBToHSV(r, g, b, h, s, v);
v = max(0.0f, min(v - 0.33f, 1.0f));
convertHSVToRGB(h, s, v, r, g, b);
return Color((int)(r * 255), (int)(g * 255), (int)(b * 255), (int)(a * 255));
}
bool Color::isDark() const
{
float r, g, b, a, h, s, v;
getRGBA(r, g, b, a);
convertRGBToHSV(r, g, b, h, s, v);
return a > 0.5 && v < 0.5;
}
static int blend(int c, int a)
{
float alpha = (float)(a) / 255;
int whiteBlend = 255 - a;
c -= whiteBlend;
return (int)(c / alpha);
}
const int cStartAlpha = 153; const int cEndAlpha = 204; const int cAlphaIncrement = 17;
Color Color::blendWithWhite() const
{
if (hasAlpha())
return *this;
Color newColor;
for (int alpha = cStartAlpha; alpha <= cEndAlpha; alpha += cAlphaIncrement) {
int r = blend(red(), alpha);
int g = blend(green(), alpha);
int b = blend(blue(), alpha);
newColor = Color(r, g, b, alpha);
if (r >= 0 && g >= 0 && b >= 0)
break;
}
return newColor;
}
void Color::getRGBA(float& r, float& g, float& b, float& a) const
{
r = red() / 255.0f;
g = green() / 255.0f;
b = blue() / 255.0f;
a = alpha() / 255.0f;
}
void Color::getRGBA(double& r, double& g, double& b, double& a) const
{
r = red() / 255.0;
g = green() / 255.0;
b = blue() / 255.0;
a = alpha() / 255.0;
}
}