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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef IMAGE_TOOLS_HEADER_45782456427634254
#define IMAGE_TOOLS_HEADER_45782456427634254
#include <numeric>
#include <wx/bitmap.h>
#include <wx/image.h>
#include <wx/dcmemory.h>
#include <zen/basic_math.h>
namespace zen
{
wxBitmap greyScale(const wxBitmap& bmp); //greyscale + brightness adaption
wxBitmap layOver(const wxBitmap& foreground, const wxBitmap& background); //merge
void move(wxImage& img, int up, int left = 0);
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
bool isEqual(const wxBitmap& lhs, const wxBitmap& rhs); //pixel-wise equality (respecting alpha channel)
wxColor gradient(const wxColor& from, const wxColor& to, double fraction); //maps fraction within [0, 1] to an intermediate color
//################################### implementation ###################################
inline
void move(wxImage& img, int up, int left)
{
img = img.GetSubImage(wxRect(std::max(0, left), std::max(0, up), img.GetWidth() - abs(left), img.GetHeight() - abs(up)));
img.Resize(wxSize(img.GetWidth() + abs(left), img.GetHeight() + abs(up)), wxPoint(-std::min(0, left), -std::min(0, up)));
}
inline
wxBitmap greyScale(const wxBitmap& bmp)
{
wxImage output = bmp.ConvertToImage().ConvertToGreyscale(1.0/3, 1.0/3, 1.0/3); //treat all channels equally!
//wxImage output = bmp.ConvertToImage().ConvertToGreyscale();
adjustBrightness(output, 170);
return output;
}
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 iter = pixBegin; iter != pixEnd; ++iter)
dividend += *iter * static_cast<double>(alphaFirst[(iter - 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)
{
const int pixelCount = img.GetWidth() * img.GetHeight();
auto pixBegin = img.GetData();
if (pixBegin)
{
auto pixEnd = pixBegin + 3 * pixelCount; //RGB
if (level > 0)
std::for_each(pixBegin, pixEnd, [&](unsigned char& c) { c = std::min(255, c + level); });
else
std::for_each(pixBegin, pixEnd, [&](unsigned char& c) { c = std::max(0, c + level); });
}
}
inline
void adjustBrightness(wxImage& img, int targetLevel)
{
brighten(img, targetLevel - getAvgBrightness(img));
}
inline
wxBitmap layOver(const wxBitmap& foreground, const wxBitmap& background)
{
wxBitmap output = background;
{
wxMemoryDC dc;
dc.SelectObject(output);
dc.DrawBitmap(foreground, 0, 0, true);
dc.SelectObject(wxNullBitmap);
}
return output;
}
inline
bool isEqual(const wxBitmap& lhs, const wxBitmap& rhs)
{
if (lhs.IsOk() != rhs.IsOk())
return false;
if (!lhs.IsOk())
return true;
const int pixelCount = lhs.GetWidth() * lhs.GetHeight();
if (pixelCount != rhs.GetWidth() * rhs.GetHeight())
return false;
wxImage imLhs = lhs.ConvertToImage();
wxImage imRhs = rhs.ConvertToImage();
if (imLhs.HasAlpha() != imRhs.HasAlpha())
return false;
if (imLhs.HasAlpha())
{
if (!std::equal(imLhs.GetAlpha(), imLhs.GetAlpha() + pixelCount, imRhs.GetAlpha()))
return false;
}
return std::equal(imLhs.GetData(), imLhs.GetData() + pixelCount * 3, imRhs.GetData());
}
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);
}
}
#endif //IMAGE_TOOLS_HEADER_45782456427634254
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