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#include <string.h>
#include <utility>
#include "BitmapDownsampled.hpp"
#include "Debug.hpp"
BitmapDownsampled::BitmapDownsampled( const Bitmap& bmp, unsigned int lines )
: Bitmap( bmp, lines )
{
m_size.x = std::max( 1, bmp.Size().x / 2 );
m_size.y = std::max( 1, bmp.Size().y / 2 );
int w = std::max( m_size.x, 4 );
int h = std::max( m_size.y, 4 );
DBGPRINT( "Subbitmap " << m_size.x << "x" << m_size.y );
m_block = m_data = new uint32_t[w*h];
if( m_size.x < w || m_size.y < h )
{
memset( m_data, 0, w*h*sizeof( uint32_t ) );
m_linesLeft = h / 4;
unsigned int lines = 0;
for( int i=0; i<h/4; i++ )
{
for( int j=0; j<4; j++ )
{
lines++;
if( lines > m_lines )
{
lines = 0;
m_sema.unlock();
}
}
}
if( lines != 0 )
{
m_sema.unlock();
}
}
else
{
m_linesLeft = h / 4;
m_load = std::async( std::launch::async, [this, &bmp, w, h]() mutable
{
auto ptr = m_data;
auto src1 = bmp.Data();
auto src2 = src1 + bmp.Size().x;
unsigned int lines = 0;
for( int i=0; i<h/4; i++ )
{
for( int j=0; j<4; j++ )
{
for( int k=0; k<m_size.x; k++ )
{
int r = ( ( *src1 & 0x000000FF ) + ( *(src1+1) & 0x000000FF ) + ( *src2 & 0x000000FF ) + ( *(src2+1) & 0x000000FF ) ) / 4;
int g = ( ( ( *src1 & 0x0000FF00 ) + ( *(src1+1) & 0x0000FF00 ) + ( *src2 & 0x0000FF00 ) + ( *(src2+1) & 0x0000FF00 ) ) / 4 ) & 0x0000FF00;
int b = ( ( ( *src1 & 0x00FF0000 ) + ( *(src1+1) & 0x00FF0000 ) + ( *src2 & 0x00FF0000 ) + ( *(src2+1) & 0x00FF0000 ) ) / 4 ) & 0x00FF0000;
int a = ( ( ( ( ( *src1 & 0xFF000000 ) >> 8 ) + ( ( *(src1+1) & 0xFF000000 ) >> 8 ) + ( ( *src2 & 0xFF000000 ) >> 8 ) + ( ( *(src2+1) & 0xFF000000 ) >> 8 ) ) / 4 ) & 0x00FF0000 ) << 8;
*ptr++ = r | g | b | a;
src1 += 2;
src2 += 2;
}
src1 += m_size.x * 2;
src2 += m_size.x * 2;
}
lines++;
if( lines >= m_lines )
{
lines = 0;
m_sema.unlock();
}
}
if( lines != 0 )
{
m_sema.unlock();
}
} );
}
}
BitmapDownsampled::~BitmapDownsampled()
{
}
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