paulxstretch/deps/juce/modules/juce_graphics/colour/juce_ColourGradient.cpp
essej 25bd5d8adb git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce
subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"
2022-04-18 17:51:22 -04:00

271 lines
8.1 KiB
C++

/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
By using JUCE, you agree to the terms of both the JUCE 6 End-User License
Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
End User License Agreement: www.juce.com/juce-6-licence
Privacy Policy: www.juce.com/juce-privacy-policy
Or: You may also use this code under the terms of the GPL v3 (see
www.gnu.org/licenses).
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
ColourGradient::ColourGradient() noexcept : isRadial (false)
{
#if JUCE_DEBUG
point1.setX (987654.0f);
#define JUCE_COLOURGRADIENT_CHECK_COORDS_INITIALISED jassert (point1.x != 987654.0f);
#else
#define JUCE_COLOURGRADIENT_CHECK_COORDS_INITIALISED
#endif
}
ColourGradient::ColourGradient (const ColourGradient& other)
: point1 (other.point1), point2 (other.point2), isRadial (other.isRadial), colours (other.colours)
{}
ColourGradient::ColourGradient (ColourGradient&& other) noexcept
: point1 (other.point1), point2 (other.point2), isRadial (other.isRadial),
colours (std::move (other.colours))
{}
ColourGradient& ColourGradient::operator= (const ColourGradient& other)
{
point1 = other.point1;
point2 = other.point2;
isRadial = other.isRadial;
colours = other.colours;
return *this;
}
ColourGradient& ColourGradient::operator= (ColourGradient&& other) noexcept
{
point1 = other.point1;
point2 = other.point2;
isRadial = other.isRadial;
colours = std::move (other.colours);
return *this;
}
ColourGradient::ColourGradient (Colour colour1, float x1, float y1,
Colour colour2, float x2, float y2, bool radial)
: ColourGradient (colour1, Point<float> (x1, y1),
colour2, Point<float> (x2, y2), radial)
{
}
ColourGradient::ColourGradient (Colour colour1, Point<float> p1,
Colour colour2, Point<float> p2, bool radial)
: point1 (p1),
point2 (p2),
isRadial (radial)
{
colours.add (ColourPoint { 0.0, colour1 },
ColourPoint { 1.0, colour2 });
}
ColourGradient::~ColourGradient() {}
ColourGradient ColourGradient::vertical (Colour c1, float y1, Colour c2, float y2)
{
return { c1, 0, y1, c2, 0, y2, false };
}
ColourGradient ColourGradient::horizontal (Colour c1, float x1, Colour c2, float x2)
{
return { c1, x1, 0, c2, x2, 0, false };
}
bool ColourGradient::operator== (const ColourGradient& other) const noexcept
{
return point1 == other.point1 && point2 == other.point2
&& isRadial == other.isRadial
&& colours == other.colours;
}
bool ColourGradient::operator!= (const ColourGradient& other) const noexcept
{
return ! operator== (other);
}
//==============================================================================
void ColourGradient::clearColours()
{
colours.clear();
}
int ColourGradient::addColour (const double proportionAlongGradient, Colour colour)
{
// must be within the two end-points
jassert (proportionAlongGradient >= 0 && proportionAlongGradient <= 1.0);
if (proportionAlongGradient <= 0)
{
colours.set (0, { 0.0, colour });
return 0;
}
auto pos = jmin (1.0, proportionAlongGradient);
int i;
for (i = 0; i < colours.size(); ++i)
if (colours.getReference(i).position > pos)
break;
colours.insert (i, { pos, colour });
return i;
}
void ColourGradient::removeColour (int index)
{
jassert (index > 0 && index < colours.size() - 1);
colours.remove (index);
}
void ColourGradient::multiplyOpacity (const float multiplier) noexcept
{
for (auto& c : colours)
c.colour = c.colour.withMultipliedAlpha (multiplier);
}
//==============================================================================
int ColourGradient::getNumColours() const noexcept
{
return colours.size();
}
double ColourGradient::getColourPosition (int index) const noexcept
{
if (isPositiveAndBelow (index, colours.size()))
return colours.getReference (index).position;
return 0;
}
Colour ColourGradient::getColour (int index) const noexcept
{
if (isPositiveAndBelow (index, colours.size()))
return colours.getReference (index).colour;
return {};
}
void ColourGradient::setColour (int index, Colour newColour) noexcept
{
if (isPositiveAndBelow (index, colours.size()))
colours.getReference (index).colour = newColour;
}
Colour ColourGradient::getColourAtPosition (double position) const noexcept
{
jassert (colours.getReference(0).position == 0.0); // the first colour specified has to go at position 0
if (position <= 0 || colours.size() <= 1)
return colours.getReference(0).colour;
int i = colours.size() - 1;
while (position < colours.getReference(i).position)
--i;
auto& p1 = colours.getReference (i);
if (i >= colours.size() - 1)
return p1.colour;
auto& p2 = colours.getReference (i + 1);
return p1.colour.interpolatedWith (p2.colour, (float) ((position - p1.position) / (p2.position - p1.position)));
}
//==============================================================================
void ColourGradient::createLookupTable (PixelARGB* const lookupTable, const int numEntries) const noexcept
{
JUCE_COLOURGRADIENT_CHECK_COORDS_INITIALISED // Trying to use this object without setting its coordinates?
jassert (colours.size() >= 2);
jassert (numEntries > 0);
jassert (colours.getReference(0).position == 0.0); // The first colour specified has to go at position 0
auto pix1 = colours.getReference (0).colour.getPixelARGB();
int index = 0;
for (int j = 1; j < colours.size(); ++j)
{
auto& p = colours.getReference (j);
auto numToDo = roundToInt (p.position * (numEntries - 1)) - index;
auto pix2 = p.colour.getPixelARGB();
for (int i = 0; i < numToDo; ++i)
{
jassert (index >= 0 && index < numEntries);
lookupTable[index] = pix1;
lookupTable[index].tween (pix2, (uint32) ((i << 8) / numToDo));
++index;
}
pix1 = pix2;
}
while (index < numEntries)
lookupTable [index++] = pix1;
}
int ColourGradient::createLookupTable (const AffineTransform& transform, HeapBlock<PixelARGB>& lookupTable) const
{
JUCE_COLOURGRADIENT_CHECK_COORDS_INITIALISED // Trying to use this object without setting its coordinates?
jassert (colours.size() >= 2);
auto numEntries = jlimit (1, jmax (1, (colours.size() - 1) << 8),
3 * (int) point1.transformedBy (transform)
.getDistanceFrom (point2.transformedBy (transform)));
lookupTable.malloc (numEntries);
createLookupTable (lookupTable, numEntries);
return numEntries;
}
bool ColourGradient::isOpaque() const noexcept
{
for (auto& c : colours)
if (! c.colour.isOpaque())
return false;
return true;
}
bool ColourGradient::isInvisible() const noexcept
{
for (auto& c : colours)
if (! c.colour.isTransparent())
return false;
return true;
}
bool ColourGradient::ColourPoint::operator== (ColourPoint other) const noexcept
{
return position == other.position && colour == other.colour;
}
bool ColourGradient::ColourPoint::operator!= (ColourPoint other) const noexcept
{
return position != other.position || colour != other.colour;
}
} // namespace juce