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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_TRACE_SIOX_H
#define INKSCAPE_TRACE_SIOX_H
/*
* Copyright 2005, 2006 by Gerald Friedland, Kristian Jantz and Lars Knipping
*
* Conversion to C++ for Inkscape by Bob Jamison
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
/*
* Note by Bob Jamison:
* After translating the siox.org Java API to C++ and receiving an
* education into this wonderful code, I began again,
* and started this version using lessons learned. This version is
* an attempt to provide an dependency-free SIOX engine that anyone
* can use in their project with minimal effort.
*
* Many thanks to the fine people at siox.org.
*/
#include <string>
#include <vector>
#include <gdkmm/pixbuf.h>
#include <glib.h>
#include "cielab.h"
namespace Inkscape {
namespace Async { template <typename... T> class Progress; }
namespace Trace {
/**
* SioxImage is the input/output format of Siox.
* It pairs a 32-bit image with an equally-sized matrix of floats representing foreground confidence values.
*/
class SioxImage
{
public:
/**
* Create an image from a Gdk::Pixbuf.
* A copy of the pixbuf is set as the pixel data, while the confidence matrix is initialized to zero.
*/
SioxImage(Glib::RefPtr<Gdk::Pixbuf> const &buf);
/**
* Create a Gdk::Pixbuf from this image.
*/
Glib::RefPtr<Gdk::Pixbuf> getGdkPixbuf() const;
/**
* Return the image data buffer.
*/
uint32_t *getImageData() { return pixdata.data(); }
uint32_t const *getImageData() const { return pixdata.data(); }
/**
* Set a confidence value at the x, y coordinates to the given value.
*/
void setConfidence(int x, int y, float conf) { cmdata[offset(x, y)] = conf; }
/**
* Return the confidence data buffer.
*/
float *getConfidenceData() { return cmdata.data(); }
float const *getConfidenceData() const { return cmdata.data(); }
/**
* Return the width of this image
*/
int getWidth() const { return width; }
/**
* Return the height of this image
*/
int getHeight() const { return height; }
/**
* Save this image as a simple color PPM
*/
bool writePPM(char const *filename) const;
/**
* Return an extremely naive but fast hash of the image/confidence map contents.
*/
unsigned hash() const;
private:
int width; ///< Width of the image
int height; ///< Height of the image
std::vector<uint32_t> pixdata; ///< Pixel data
std::vector<float> cmdata; ///< Confidence matrix data
/**
* Return the offset of a given pixel within both data arrays.
*/
int constexpr offset(int x, int y) const { return width * y + x; }
};
class Siox
{
public:
/**
* Confidence corresponding to a certain foreground region (equals one).
*/
static constexpr float CERTAIN_FOREGROUND_CONFIDENCE = 1.0f;
/**
* Confidence for a region likely being foreground.
*/
static constexpr float FOREGROUND_CONFIDENCE = 0.8f;
/**
* Confidence for foreground or background type being equally likely.
*/
static constexpr float UNKNOWN_REGION_CONFIDENCE = 0.5f;
/**
* Confidence for a region likely being background.
*/
static constexpr float BACKGROUND_CONFIDENCE = 0.1f;
/**
* Confidence corresponding to a certain background reagion (equals zero).
*/
static constexpr float CERTAIN_BACKGROUND_CONFIDENCE = 0.0f;
Siox(Async::Progress<double> &progress);
/**
* Extract the foreground of the original image, according to the values in the confidence matrix.
* If the operation fails or is aborted, an exception is thrown.
* \param backgroundFillColor Any ARGB color, such as 0xffffff (white) or 0x000000 (black).
* \throws Siox::Exception on error.
* \throws Async::CancelledException on cancellation.
*/
SioxImage extractForeground(SioxImage const &originalImage, uint32_t backgroundFillColor);
class Exception {};
private:
Async::Progress<double> *progress;
int width; ///< Width of the image
int height; ///< Height of the image
int pixelCount; ///< Number of pixels in the image
uint32_t *image; ///< Working image data
float *cm; ///< Working image confidence matrix
/**
* Markup for image editing
*/
int *labelField;
/**
* Our signature limits
*/
float limits[3];
/**
* Maximum distance of two lab values.
*/
float clusterSize;
/**
* Initialize the Siox engine to its 'pristine' state.
* Performed at the beginning of extractForeground().
*/
void init();
/**
* Error logging
*/
void error(std::string const &str);
/**
* Trace logging
*/
void trace(std::string const &str);
/**
* Stage 1 of the color signature work. 'dims' will be either 2 for grays, or 3 for colors.
*/
void colorSignatureStage1(CieLab *points,
unsigned leftBase,
unsigned rightBase,
unsigned recursionDepth,
unsigned *clusters,
unsigned dims);
/**
* Stage 2 of the color signature work
*/
void colorSignatureStage2(CieLab *points,
unsigned leftBase,
unsigned rightBase,
unsigned recursionDepth,
unsigned *clusters,
float threshold,
unsigned dims);
/**
* Main color signature method
*/
void colorSignature(std::vector<CieLab> const &inputVec,
std::vector<CieLab> &result,
unsigned dims);
void keepOnlyLargeComponents(float threshold, double sizeFactorToKeep);
int depthFirstSearch(int startPos, float threshold, int curLabel);
void fillColorRegions();
};
} // namespace Trace
} // namespace Inkscape
#endif // INKSCAPE_TRACE_SIOX_H
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