kicad/3d-viewer/3d_rendering/image.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015-2016 Mario Luzeiro <mrluzeiro@ua.pt>
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* Copyright (C) 2015-2020 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file image.cpp
* @brief one 8bit-channel image implementation.
*/
#include "image.h"
#include "buffers_debug.h"
#include <cstring> // For memcpy
#include <algorithm>
#include <atomic>
#include <thread>
#include <chrono>
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#ifndef CLAMP
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#define CLAMP( n, min, max ) {if( n < min ) n=min; else if( n > max ) n = max;}
#endif
IMAGE::IMAGE( unsigned int aXsize, unsigned int aYsize )
{
m_wxh = aXsize * aYsize;
m_pixels = new unsigned char[m_wxh];
memset( m_pixels, 0, m_wxh );
m_width = aXsize;
m_height = aYsize;
m_wraping = IMAGE_WRAP::CLAMP;
}
IMAGE::IMAGE( const IMAGE& aSrcImage )
{
m_wxh = aSrcImage.GetWidth() * aSrcImage.GetHeight();
m_pixels = new unsigned char[m_wxh];
memcpy( m_pixels, aSrcImage.GetBuffer(), m_wxh );
m_width = aSrcImage.GetWidth();
m_height = aSrcImage.GetHeight();
m_wraping = IMAGE_WRAP::CLAMP;
}
IMAGE::~IMAGE()
{
delete[] m_pixels;
}
unsigned char* IMAGE::GetBuffer() const
{
return m_pixels;
}
bool IMAGE::wrapCoords( int* aXo, int* aYo ) const
{
int x = *aXo;
int y = *aYo;
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switch( m_wraping )
{
case IMAGE_WRAP::CLAMP:
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x = ( x < 0 ) ? 0 : x;
x = ( x >= (int) ( m_width - 1 ) ) ? ( m_width - 1 ) : x;
y = ( y < 0 ) ? 0 : y;
y = ( y >= (int) ( m_height - 1 ) ) ? ( m_height - 1 ) : y;
break;
case IMAGE_WRAP::WRAP:
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x = ( x < 0 ) ? ( ( m_width - 1 ) + x ) : x;
x = ( x >= (int) ( m_width - 1 ) ) ? ( x - m_width ) : x;
y = ( y < 0 ) ? ( ( m_height - 1 ) + y ) : y;
y = ( y >= (int) ( m_height - 1 ) ) ? ( y - m_height ) : y;
break;
default:
break;
}
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if( ( x < 0 ) || ( x >= (int) m_width ) || ( y < 0 ) || ( y >= (int) m_height ) )
return false;
*aXo = x;
*aYo = y;
return true;
}
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void IMAGE::plot8CircleLines( int aCx, int aCy, int aX, int aY, unsigned char aValue )
{
Hline( aCx - aX, aCx + aX, aCy + aY, aValue );
Hline( aCx - aX, aCx + aX, aCy - aY, aValue );
Hline( aCx - aY, aCx + aY, aCy + aX, aValue );
Hline( aCx - aY, aCx + aY, aCy - aX, aValue );
}
void IMAGE::Setpixel( int aX, int aY, unsigned char aValue )
{
if( wrapCoords( &aX, &aY ) )
m_pixels[aX + aY * m_width] = aValue;
}
unsigned char IMAGE::Getpixel( int aX, int aY ) const
{
if( wrapCoords( &aX, &aY ) )
return m_pixels[aX + aY * m_width];
else
return 0;
}
void IMAGE::Hline( int aXStart, int aXEnd, int aY, unsigned char aValue )
{
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if( ( aY < 0 ) || ( aY >= (int) m_height ) || ( ( aXStart < 0 ) && ( aXEnd < 0 ) )
|| ( ( aXStart >= (int) m_width ) && ( aXEnd >= (int) m_width ) ) )
return;
if( aXStart > aXEnd )
{
int swap = aXStart;
aXStart = aXEnd;
aXEnd = swap;
}
// Clamp line
if( aXStart < 0 )
aXStart = 0;
if( aXEnd >= (int)m_width )
aXEnd = m_width - 1;
unsigned char* pixelPtr = &m_pixels[aXStart + aY * m_width];
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unsigned char* pixelPtrEnd = pixelPtr + (unsigned int) ( ( aXEnd - aXStart ) + 1 );
while( pixelPtr < pixelPtrEnd )
{
*pixelPtr = aValue;
pixelPtr++;
}
}
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// Based on paper
// http://web.engr.oregonstate.edu/~sllu/bcircle.pdf
void IMAGE::CircleFilled( int aCx, int aCy, int aRadius, unsigned char aValue )
{
int x = aRadius;
int y = 0;
int xChange = 1 - 2 * aRadius;
int yChange = 0;
int radiusError = 0;
while( x >= y )
{
plot8CircleLines( aCx, aCy, x, y, aValue );
y++;
radiusError += yChange;
yChange += 2;
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if( ( 2 * radiusError + xChange ) > 0 )
{
x--;
radiusError += xChange;
xChange += 2;
}
}
}
void IMAGE::Invert()
{
for( unsigned int it = 0; it < m_wxh; it++ )
m_pixels[it] = 255 - m_pixels[it];
}
void IMAGE::CopyFull( const IMAGE* aImgA, const IMAGE* aImgB, IMAGE_OP aOperation )
{
int aV, bV;
if( aOperation == IMAGE_OP::RAW )
{
if( aImgA == nullptr )
return;
}
else
{
if( ( aImgA == nullptr ) || ( aImgB == nullptr ) )
return;
}
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switch( aOperation )
{
case IMAGE_OP::RAW:
memcpy( m_pixels, aImgA->m_pixels, m_wxh );
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break;
case IMAGE_OP::ADD:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
aV = (aV + bV);
aV = (aV > 255)?255:aV;
m_pixels[it] = aV;
}
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break;
case IMAGE_OP::SUB:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
aV = (aV - bV);
aV = (aV < 0)?0:aV;
m_pixels[it] = aV;
}
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break;
case IMAGE_OP::DIF:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
m_pixels[it] = abs( aV - bV );
}
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break;
case IMAGE_OP::MUL:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
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m_pixels[it] =
(unsigned char) ( ( ( (float) aV / 255.0f ) * ( (float) bV / 255.0f ) ) * 255 );
}
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break;
case IMAGE_OP::AND:
for( unsigned int it = 0;it < m_wxh; it++ )
{
m_pixels[it] = aImgA->m_pixels[it] & aImgB->m_pixels[it];
}
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break;
case IMAGE_OP::OR:
for( unsigned int it = 0;it < m_wxh; it++ )
{
m_pixels[it] = aImgA->m_pixels[it] | aImgB->m_pixels[it];
}
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break;
case IMAGE_OP::XOR:
for( unsigned int it = 0;it < m_wxh; it++ )
{
m_pixels[it] = aImgA->m_pixels[it] ^ aImgB->m_pixels[it];
}
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break;
case IMAGE_OP::BLEND50:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
m_pixels[it] = (aV + bV) / 2;
}
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break;
case IMAGE_OP::MIN:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
m_pixels[it] = (aV < bV)?aV:bV;
}
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break;
case IMAGE_OP::MAX:
for( unsigned int it = 0;it < m_wxh; it++ )
{
aV = aImgA->m_pixels[it];
bV = aImgB->m_pixels[it];
m_pixels[it] = (aV > bV)?aV:bV;
}
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break;
default:
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break;
}
}
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// TIP: If you want create or test filters you can use GIMP
// with a generic convolution matrix and get the values from there.
// http://docs.gimp.org/nl/plug-in-convmatrix.html
// clang-format off
static const S_FILTER FILTERS[] = {
// IMAGE_FILTER::HIPASS
{
{ { 0, -1, -1, -1, 0},
{-1, 2, -4, 2, -1},
{-1, -4, 13, -4, -1},
{-1, 2, -4, 2, -1},
{ 0, -1, -1, -1, 0}
},
7,
255
},
// IMAGE_FILTER::GAUSSIAN_BLUR
{
{ { 3, 5, 7, 5, 3},
{ 5, 9, 12, 9, 5},
{ 7, 12, 20, 12, 7},
{ 5, 9, 12, 9, 5},
{ 3, 5, 7, 5, 3}
},
182,
0
},
// IMAGE_FILTER::GAUSSIAN_BLUR2
{
{ { 1, 4, 7, 4, 1},
{ 4, 16, 26, 16, 4},
{ 7, 26, 41, 26, 7},
{ 4, 16, 26, 16, 4},
{ 1, 4, 7, 4, 1}
},
273,
0
},
// IMAGE_FILTER::INVERT_BLUR
{
{ { 0, 0, 0, 0, 0},
{ 0, 0, -1, 0, 0},
{ 0, -1, 0, -1, 0},
{ 0, 0, -1, 0, 0},
{ 0, 0, 0, 0, 0}
},
4,
255
},
// IMAGE_FILTER::CARTOON
{
{ {-1, -1, -1, -1, 0},
{-1, 0, 0, 0, 0},
{-1, 0, 4, 0, 0},
{ 0, 0, 0, 1, 0},
{ 0, 0, 0, 0, 4}
},
3,
0
},
// IMAGE_FILTER::EMBOSS
{
{ {-1, -1, -1, -1, 0},
{-1, -1, -1, 0, 1},
{-1, -1, 0, 1, 1},
{-1, 0, 1, 1, 1},
{ 0, 1, 1, 1, 1}
},
1,
128
},
// IMAGE_FILTER::SHARPEN
{
{ {-1, -1, -1, -1, -1},
{-1, 2, 2, 2, -1},
{-1, 2, 8, 2, -1},
{-1, 2, 2, 2, -1},
{-1, -1, -1, -1, -1}
},
8,
0
},
// IMAGE_FILTER::MELT
{
{ { 4, 2, 6, 8, 1},
{ 1, 2, 5, 4, 2},
{ 0, -1, 1, -1, 0},
{ 0, 0, -2, 0, 0},
{ 0, 0, 0, 0, 0}
},
32,
0
},
// IMAGE_FILTER::SOBEL_GX
{
{ { 0, 0, 0, 0, 0},
{ 0, -1, 0, 1, 0},
{ 0, -2, 0, 2, 0},
{ 0, -1, 0, 1, 0},
{ 0, 0, 0, 0, 0}
},
1,
0
},
// IMAGE_FILTER::SOBEL_GY
{
{ { 1, 2, 4, 2, 1},
{-1, -1, 0, 1, 1},
{-2, -2, 0, 2, 2},
{-1, -1, 0, 1, 1},
{-1, -2, -4, -2, -1},
},
1,
0
},
// IMAGE_FILTER::BLUR_3X3
{
{ { 0, 0, 0, 0, 0},
{ 0, 1, 2, 1, 0},
{ 0, 2, 4, 2, 0},
{ 0, 1, 2, 1, 0},
{ 0, 0, 0, 0, 0},
},
16,
0
}
};// Filters
// clang-format on
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/// @todo: This function can be optimized slipping it between the edges and
/// do it without use the getpixel function.
/// Optimization can be done to m_pixels[ix + iy * m_width]
/// but keep in mind the parallel process of the algorithm
void IMAGE::EfxFilter( IMAGE* aInImg, IMAGE_FILTER aFilterType )
{
S_FILTER filter = FILTERS[static_cast<int>( aFilterType )];
aInImg->m_wraping = IMAGE_WRAP::CLAMP;
m_wraping = IMAGE_WRAP::CLAMP;
std::atomic<size_t> nextRow( 0 );
std::atomic<size_t> threadsFinished( 0 );
size_t parallelThreadCount = std::max<size_t>( std::thread::hardware_concurrency(), 2 );
for( size_t ii = 0; ii < parallelThreadCount; ++ii )
{
std::thread t = std::thread( [&]()
{
for( size_t iy = nextRow.fetch_add( 1 ); iy < m_height; iy = nextRow.fetch_add( 1 ) )
{
for( size_t ix = 0; ix < m_width; ix++ )
{
int v = 0;
for( size_t sy = 0; sy < 5; sy++ )
{
for( size_t sx = 0; sx < 5; sx++ )
{
int factor = filter.kernel[sx][sy];
unsigned char pixelv = aInImg->Getpixel( ix + sx - 2, iy + sy - 2 );
v += pixelv * factor;
}
}
v /= filter.div;
v += filter.offset;
CLAMP(v, 0, 255);
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/// @todo This needs to write to a separate buffer.
m_pixels[ix + iy * m_width] = v;
}
}
threadsFinished++;
} );
t.detach();
}
while( threadsFinished < parallelThreadCount )
std::this_thread::sleep_for( std::chrono::milliseconds( 10 ) );
}
void IMAGE::EfxFilter_SkipCenter( IMAGE* aInImg, IMAGE_FILTER aFilterType, unsigned int aRadius )
{
if( ( !aInImg ) || ( m_width != aInImg->m_width ) || ( m_height != aInImg->m_height ) )
return;
S_FILTER filter = FILTERS[static_cast<int>( aFilterType )];
aInImg->m_wraping = IMAGE_WRAP::ZERO;
const unsigned int radiusSquared = aRadius * aRadius;
const unsigned int xCenter = m_width / 2;
const unsigned int yCenter = m_height / 2;
for( size_t iy = 0; iy < m_height; iy++ )
{
int yc = iy - yCenter;
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unsigned int ycsq = yc * yc;
for( size_t ix = 0; ix < m_width; ix++ )
{
int xc = ix - xCenter;
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unsigned int xcsq = xc * xc;
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if( ( xcsq + ycsq ) < radiusSquared )
{
const unsigned int offset = ix + iy * m_width;
m_pixels[offset] = aInImg->m_pixels[offset];
continue;
}
int v = 0;
for( size_t sy = 0; sy < 5; sy++ )
{
for( size_t sx = 0; sx < 5; sx++ )
{
int factor = filter.kernel[sx][sy];
unsigned char pixelv = aInImg->Getpixel( ix + sx - 2, iy + sy - 2 );
v += pixelv * factor;
}
}
v /= filter.div;
v += filter.offset;
CLAMP(v, 0, 255);
m_pixels[ix + iy * m_width] = v;
}
}
}
void IMAGE::SetPixelsFromNormalizedFloat( const float* aNormalizedFloatArray )
{
for( unsigned int i = 0; i < m_wxh; i++ )
{
int v = aNormalizedFloatArray[i] * 255;
CLAMP( v, 0, 255 );
m_pixels[i] = v;
}
}
void IMAGE::SaveAsPNG( const wxString& aFileName ) const
{
DBG_SaveBuffer( aFileName, m_pixels, m_width, m_height );
}