469 lines
15 KiB
C++
469 lines
15 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace ColourHelpers
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{
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static uint8 floatToUInt8 (const float n) noexcept
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{
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return n <= 0.0f ? 0 : (n >= 1.0f ? 255 : static_cast<uint8> (n * 255.996f));
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}
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//==============================================================================
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struct HSB
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{
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HSB (Colour col) noexcept
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{
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const int r = col.getRed();
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const int g = col.getGreen();
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const int b = col.getBlue();
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const int hi = jmax (r, g, b);
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const int lo = jmin (r, g, b);
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if (hi != 0)
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{
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saturation = (hi - lo) / (float) hi;
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if (saturation > 0)
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{
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const float invDiff = 1.0f / (hi - lo);
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const float red = (hi - r) * invDiff;
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const float green = (hi - g) * invDiff;
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const float blue = (hi - b) * invDiff;
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if (r == hi)
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hue = blue - green;
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else if (g == hi)
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hue = 2.0f + red - blue;
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else
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hue = 4.0f + green - red;
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hue *= 1.0f / 6.0f;
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if (hue < 0)
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++hue;
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}
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else
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{
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hue = 0;
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}
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}
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else
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{
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saturation = hue = 0;
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}
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brightness = hi / 255.0f;
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}
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Colour toColour (Colour original) const noexcept
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{
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return Colour (hue, saturation, brightness, original.getAlpha());
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}
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static PixelARGB toRGB (float h, float s, float v, const uint8 alpha) noexcept
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{
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v = jlimit (0.0f, 255.0f, v * 255.0f);
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const uint8 intV = (uint8) roundToInt (v);
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if (s <= 0)
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return PixelARGB (alpha, intV, intV, intV);
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s = jmin (1.0f, s);
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h = (h - std::floor (h)) * 6.0f + 0.00001f; // need a small adjustment to compensate for rounding errors
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const float f = h - std::floor (h);
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const uint8 x = (uint8) roundToInt (v * (1.0f - s));
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if (h < 1.0f) return PixelARGB (alpha, intV, (uint8) roundToInt (v * (1.0f - (s * (1.0f - f)))), x);
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if (h < 2.0f) return PixelARGB (alpha, (uint8) roundToInt (v * (1.0f - s * f)), intV, x);
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if (h < 3.0f) return PixelARGB (alpha, x, intV, (uint8) roundToInt (v * (1.0f - (s * (1.0f - f)))));
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if (h < 4.0f) return PixelARGB (alpha, x, (uint8) roundToInt (v * (1.0f - s * f)), intV);
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if (h < 5.0f) return PixelARGB (alpha, (uint8) roundToInt (v * (1.0f - (s * (1.0f - f)))), x, intV);
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return PixelARGB (alpha, intV, x, (uint8) roundToInt (v * (1.0f - s * f)));
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}
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float hue, saturation, brightness;
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};
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//==============================================================================
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struct YIQ
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{
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YIQ (Colour c) noexcept
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{
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const float r = c.getFloatRed();
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const float g = c.getFloatGreen();
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const float b = c.getFloatBlue();
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y = 0.2999f * r + 0.5870f * g + 0.1140f * b;
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i = 0.5957f * r - 0.2744f * g - 0.3212f * b;
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q = 0.2114f * r - 0.5225f * g - 0.3113f * b;
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alpha = c.getFloatAlpha();
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}
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Colour toColour() const noexcept
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{
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return Colour::fromFloatRGBA (y + 0.9563f * i + 0.6210f * q,
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y - 0.2721f * i - 0.6474f * q,
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y - 1.1070f * i + 1.7046f * q,
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alpha);
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}
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float y, i, q, alpha;
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};
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}
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//==============================================================================
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Colour::Colour() noexcept
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: argb (0, 0, 0, 0)
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{
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}
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Colour::Colour (const Colour& other) noexcept
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: argb (other.argb)
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{
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}
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Colour& Colour::operator= (const Colour& other) noexcept
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{
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argb = other.argb;
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return *this;
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}
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bool Colour::operator== (const Colour& other) const noexcept { return argb.getNativeARGB() == other.argb.getNativeARGB(); }
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bool Colour::operator!= (const Colour& other) const noexcept { return argb.getNativeARGB() != other.argb.getNativeARGB(); }
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//==============================================================================
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Colour::Colour (const uint32 col) noexcept
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: argb ((col >> 24) & 0xff, (col >> 16) & 0xff, (col >> 8) & 0xff, col & 0xff)
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{
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}
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Colour::Colour (const uint8 red, const uint8 green, const uint8 blue) noexcept
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{
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argb.setARGB (0xff, red, green, blue);
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}
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Colour Colour::fromRGB (const uint8 red, const uint8 green, const uint8 blue) noexcept
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{
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return Colour (red, green, blue);
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}
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Colour::Colour (const uint8 red, const uint8 green, const uint8 blue, const uint8 alpha) noexcept
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{
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argb.setARGB (alpha, red, green, blue);
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}
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Colour Colour::fromRGBA (const uint8 red, const uint8 green, const uint8 blue, const uint8 alpha) noexcept
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{
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return Colour (red, green, blue, alpha);
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}
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Colour::Colour (const uint8 red, const uint8 green, const uint8 blue, const float alpha) noexcept
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{
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argb.setARGB (ColourHelpers::floatToUInt8 (alpha), red, green, blue);
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}
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Colour Colour::fromFloatRGBA (const float red, const float green, const float blue, const float alpha) noexcept
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{
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return Colour (ColourHelpers::floatToUInt8 (red),
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ColourHelpers::floatToUInt8 (green),
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ColourHelpers::floatToUInt8 (blue), alpha);
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}
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Colour::Colour (const float hue, const float saturation, const float brightness, const float alpha) noexcept
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: argb (ColourHelpers::HSB::toRGB (hue, saturation, brightness, ColourHelpers::floatToUInt8 (alpha)))
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{
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}
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Colour Colour::fromHSV (const float hue, const float saturation, const float brightness, const float alpha) noexcept
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{
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return Colour (hue, saturation, brightness, alpha);
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}
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Colour::Colour (const float hue, const float saturation, const float brightness, const uint8 alpha) noexcept
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: argb (ColourHelpers::HSB::toRGB (hue, saturation, brightness, alpha))
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{
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}
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Colour::Colour (PixelARGB argb_) noexcept
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: argb (argb_)
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{
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}
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Colour::Colour (PixelRGB rgb) noexcept
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: argb (Colour (rgb.getInARGBMaskOrder()).argb)
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{
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}
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Colour::Colour (PixelAlpha alpha) noexcept
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: argb (Colour (alpha.getInARGBMaskOrder()).argb)
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{
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}
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Colour::~Colour() noexcept
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{
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}
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//==============================================================================
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const PixelARGB Colour::getPixelARGB() const noexcept
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{
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PixelARGB p (argb);
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p.premultiply();
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return p;
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}
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uint32 Colour::getARGB() const noexcept
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{
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return argb.getInARGBMaskOrder();
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}
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//==============================================================================
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bool Colour::isTransparent() const noexcept
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{
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return getAlpha() == 0;
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}
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bool Colour::isOpaque() const noexcept
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{
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return getAlpha() == 0xff;
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}
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Colour Colour::withAlpha (const uint8 newAlpha) const noexcept
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{
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PixelARGB newCol (argb);
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newCol.setAlpha (newAlpha);
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return Colour (newCol);
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}
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Colour Colour::withAlpha (const float newAlpha) const noexcept
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{
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jassert (newAlpha >= 0 && newAlpha <= 1.0f);
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PixelARGB newCol (argb);
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newCol.setAlpha (ColourHelpers::floatToUInt8 (newAlpha));
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return Colour (newCol);
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}
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Colour Colour::withMultipliedAlpha (const float alphaMultiplier) const noexcept
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{
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jassert (alphaMultiplier >= 0);
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PixelARGB newCol (argb);
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newCol.setAlpha ((uint8) jmin (0xff, roundToInt (alphaMultiplier * newCol.getAlpha())));
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return Colour (newCol);
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}
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//==============================================================================
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Colour Colour::overlaidWith (Colour src) const noexcept
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{
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const int destAlpha = getAlpha();
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if (destAlpha <= 0)
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return src;
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const int invA = 0xff - (int) src.getAlpha();
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const int resA = 0xff - (((0xff - destAlpha) * invA) >> 8);
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if (resA <= 0)
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return *this;
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const int da = (invA * destAlpha) / resA;
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return Colour ((uint8) (src.getRed() + ((((int) getRed() - src.getRed()) * da) >> 8)),
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(uint8) (src.getGreen() + ((((int) getGreen() - src.getGreen()) * da) >> 8)),
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(uint8) (src.getBlue() + ((((int) getBlue() - src.getBlue()) * da) >> 8)),
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(uint8) resA);
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}
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Colour Colour::interpolatedWith (Colour other, float proportionOfOther) const noexcept
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{
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if (proportionOfOther <= 0)
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return *this;
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if (proportionOfOther >= 1.0f)
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return other;
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PixelARGB c1 (getPixelARGB());
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const PixelARGB c2 (other.getPixelARGB());
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c1.tween (c2, (uint32) roundToInt (proportionOfOther * 255.0f));
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c1.unpremultiply();
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return Colour (c1);
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}
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//==============================================================================
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float Colour::getFloatRed() const noexcept { return getRed() / 255.0f; }
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float Colour::getFloatGreen() const noexcept { return getGreen() / 255.0f; }
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float Colour::getFloatBlue() const noexcept { return getBlue() / 255.0f; }
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float Colour::getFloatAlpha() const noexcept { return getAlpha() / 255.0f; }
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//==============================================================================
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void Colour::getHSB (float& h, float& s, float& v) const noexcept
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{
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const ColourHelpers::HSB hsb (*this);
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h = hsb.hue;
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s = hsb.saturation;
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v = hsb.brightness;
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}
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float Colour::getHue() const noexcept { return ColourHelpers::HSB (*this).hue; }
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float Colour::getSaturation() const noexcept { return ColourHelpers::HSB (*this).saturation; }
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float Colour::getBrightness() const noexcept { return ColourHelpers::HSB (*this).brightness; }
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Colour Colour::withHue (float h) const noexcept { ColourHelpers::HSB hsb (*this); hsb.hue = h; return hsb.toColour (*this); }
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Colour Colour::withSaturation (float s) const noexcept { ColourHelpers::HSB hsb (*this); hsb.saturation = s; return hsb.toColour (*this); }
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Colour Colour::withBrightness (float v) const noexcept { ColourHelpers::HSB hsb (*this); hsb.brightness = v; return hsb.toColour (*this); }
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float Colour::getPerceivedBrightness() const noexcept
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{
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return std::sqrt (0.241f * square (getFloatRed())
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+ 0.691f * square (getFloatGreen())
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+ 0.068f * square (getFloatBlue()));
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}
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//==============================================================================
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Colour Colour::withRotatedHue (const float amountToRotate) const noexcept
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{
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ColourHelpers::HSB hsb (*this);
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hsb.hue += amountToRotate;
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return hsb.toColour (*this);
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}
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Colour Colour::withMultipliedSaturation (const float amount) const noexcept
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{
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ColourHelpers::HSB hsb (*this);
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hsb.saturation = jmin (1.0f, hsb.saturation * amount);
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return hsb.toColour (*this);
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}
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Colour Colour::withMultipliedBrightness (const float amount) const noexcept
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{
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ColourHelpers::HSB hsb (*this);
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hsb.brightness = jmin (1.0f, hsb.brightness * amount);
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return hsb.toColour (*this);
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}
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//==============================================================================
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Colour Colour::brighter (float amount) const noexcept
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{
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amount = 1.0f / (1.0f + amount);
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return Colour ((uint8) (255 - (amount * (255 - getRed()))),
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(uint8) (255 - (amount * (255 - getGreen()))),
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(uint8) (255 - (amount * (255 - getBlue()))),
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getAlpha());
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}
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Colour Colour::darker (float amount) const noexcept
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{
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amount = 1.0f / (1.0f + amount);
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return Colour ((uint8) (amount * getRed()),
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(uint8) (amount * getGreen()),
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(uint8) (amount * getBlue()),
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getAlpha());
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}
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//==============================================================================
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Colour Colour::greyLevel (const float brightness) noexcept
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{
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const uint8 level = ColourHelpers::floatToUInt8 (brightness);
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return Colour (level, level, level);
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}
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//==============================================================================
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Colour Colour::contrasting (const float amount) const noexcept
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{
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return overlaidWith ((getPerceivedBrightness() >= 0.5f
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? Colours::black
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: Colours::white).withAlpha (amount));
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}
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Colour Colour::contrasting (Colour target, float minContrast) const noexcept
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{
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const ColourHelpers::YIQ bg (*this);
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ColourHelpers::YIQ fg (target);
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if (std::abs (bg.y - fg.y) >= minContrast)
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return target;
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const float y1 = jmax (0.0f, bg.y - minContrast);
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const float y2 = jmin (1.0f, bg.y + minContrast);
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fg.y = (std::abs (y1 - bg.y) > std::abs (y2 - bg.y)) ? y1 : y2;
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return fg.toColour();
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}
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Colour Colour::contrasting (Colour colour1,
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Colour colour2) noexcept
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{
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const float b1 = colour1.getPerceivedBrightness();
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const float b2 = colour2.getPerceivedBrightness();
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float best = 0.0f;
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float bestDist = 0.0f;
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for (float i = 0.0f; i < 1.0f; i += 0.02f)
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{
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const float d1 = std::abs (i - b1);
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const float d2 = std::abs (i - b2);
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const float dist = jmin (d1, d2, 1.0f - d1, 1.0f - d2);
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if (dist > bestDist)
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{
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best = i;
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bestDist = dist;
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}
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}
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return colour1.overlaidWith (colour2.withMultipliedAlpha (0.5f))
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.withBrightness (best);
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}
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//==============================================================================
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String Colour::toString() const
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{
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return String::toHexString ((int) argb.getInARGBMaskOrder());
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}
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Colour Colour::fromString (StringRef encodedColourString)
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{
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return Colour ((uint32) CharacterFunctions::HexParser<int>::parse (encodedColourString.text));
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}
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String Colour::toDisplayString (const bool includeAlphaValue) const
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{
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return String::toHexString ((int) (argb.getInARGBMaskOrder() & (includeAlphaValue ? 0xffffffff : 0xffffff)))
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.paddedLeft ('0', includeAlphaValue ? 8 : 6)
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.toUpperCase();
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}
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} // namespace juce
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