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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef IMAGE_TOOLS_H_45782456427634254
#define IMAGE_TOOLS_H_45782456427634254
#include <numeric>
#include <wx/image.h>
#include <wx/dcmemory.h>
#include <zen/basic_math.h>
#include <wx+/dc.h>
namespace zen
{
enum class ImageStackLayout
{
horizontal,
vertical
};
enum class ImageStackAlignment //one-dimensional unlike wxAlignment
{
center,
left,
right,
top = left,
bottom = right,
};
wxImage stackImages(const wxImage& img1, const wxImage& img2, ImageStackLayout dir, ImageStackAlignment align, int gap = 0);
wxImage createImageFromText(const wxString& text, const wxFont& font, const wxColor& col, ImageStackAlignment textAlign = ImageStackAlignment::left); //center/left/right
wxImage layOver(const wxImage& back, const wxImage& front, int alignment = wxALIGN_CENTER);
wxImage greyScale(const wxImage& img); //greyscale + brightness adaption
wxImage greyScaleIfDisabled(const wxImage& img, bool enabled);
//void moveImage(wxImage& img, int right, int up);
void adjustBrightness(wxImage& img, int targetLevel);
double getAvgBrightness(const wxImage& img); //in [0, 255]
void brighten(wxImage& img, int level); //level: delta per channel in points
void convertToVanillaImage(wxImage& img); //add alpha channel if missing + remove mask if existing
//wxColor gradient(const wxColor& from, const wxColor& to, double fraction); //maps fraction within [0, 1] to an intermediate color
//wxColor hsvColor(double h, double s, double v); //h within [0, 360), s, v within [0, 1]
//does *not* fuck up alpha channel like naive bilinear implementations, e.g. wxImage::Scale()
wxImage bilinearScale(const wxImage& img, int width, int height);
wxImage shrinkImage(const wxImage& img, int maxWidth /*optional*/, int maxHeight /*optional*/);
inline wxImage shrinkImage(const wxImage& img, int maxSize) { return shrinkImage(img, maxSize, maxSize); }
wxImage resizeCanvas(const wxImage& img, wxSize newSize, int alignment);
//################################### implementation ###################################
inline
wxImage greyScale(const wxImage& img)
{
wxImage output = img.ConvertToGreyscale(1.0 / 3, 1.0 / 3, 1.0 / 3); //treat all channels equally!
adjustBrightness(output, 160);
return output;
}
inline
wxImage greyScaleIfDisabled(const wxImage& img, bool enabled)
{
if (enabled) //avoid ternary WTF
return img;
else
return greyScale(img);
}
inline
double getAvgBrightness(const wxImage& img)
{
const int pixelCount = img.GetWidth() * img.GetHeight();
auto pixBegin = img.GetData();
if (pixelCount > 0 && pixBegin)
{
auto pixEnd = pixBegin + 3 * pixelCount; //RGB
if (img.HasAlpha())
{
const unsigned char* alphaFirst = img.GetAlpha();
//calculate average weighted by alpha channel
double dividend = 0;
for (auto it = pixBegin; it != pixEnd; ++it)
dividend += *it * static_cast<double>(alphaFirst[(it - pixBegin) / 3]);
const double divisor = 3.0 * std::accumulate(alphaFirst, alphaFirst + pixelCount, 0.0);
return numeric::isNull(divisor) ? 0 : dividend / divisor;
}
else
return std::accumulate(pixBegin, pixEnd, 0.0) / (3.0 * pixelCount);
}
return 0;
}
inline
void brighten(wxImage& img, int level)
{
if (auto pixBegin = img.GetData())
{
const int pixelCount = img.GetWidth() * img.GetHeight();
auto pixEnd = pixBegin + 3 * pixelCount; //RGB
if (level > 0)
std::for_each(pixBegin, pixEnd, [&](unsigned char& c) { c = static_cast<unsigned char>(std::min(255, c + level)); });
else
std::for_each(pixBegin, pixEnd, [&](unsigned char& c) { c = static_cast<unsigned char>(std::max(0, c + level)); });
}
}
inline
void adjustBrightness(wxImage& img, int targetLevel)
{
brighten(img, targetLevel - getAvgBrightness(img));
}
/*
inline
wxColor gradient(const wxColor& from, const wxColor& to, double fraction)
{
fraction = std::max(0.0, fraction);
fraction = std::min(1.0, fraction);
return wxColor(from.Red () + (to.Red () - from.Red ()) * fraction,
from.Green() + (to.Green() - from.Green()) * fraction,
from.Blue () + (to.Blue () - from.Blue ()) * fraction,
from.Alpha() + (to.Alpha() - from.Alpha()) * fraction);
}
*/
/*
inline
wxColor hsvColor(double h, double s, double v) //h within [0, 360), s, v within [0, 1]
{
//https://en.wikipedia.org/wiki/HSL_and_HSV
//make input values fit into bounds
if (h > 360)
h -= static_cast<int>(h / 360) * 360;
else if (h < 0)
h -= static_cast<int>(h / 360) * 360 - 360;
numeric::confine<double>(s, 0, 1);
numeric::confine<double>(v, 0, 1);
//------------------------------------
const int h_i = h / 60;
const float f = h / 60 - h_i;
auto polish = [](double val) -> unsigned char
{
int result = std::round(val * 255);
numeric::confine(result, 0, 255);
return static_cast<unsigned char>(result);
};
const unsigned char p = polish(v * (1 - s));
const unsigned char q = polish(v * (1 - s * f));
const unsigned char t = polish(v * (1 - s * (1 - f)));
const unsigned char vi = polish(v);
switch (h_i)
{
case 0:
return wxColor(vi, t, p);
case 1:
return wxColor(q, vi, p);
case 2:
return wxColor(p, vi, t);
case 3:
return wxColor(p, q, vi);
case 4:
return wxColor(t, p, vi);
case 5:
return wxColor(vi, p, q);
}
assert(false);
return *wxBLACK;
}
*/
}
#endif //IMAGE_TOOLS_H_45782456427634254
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