104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
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//========= Copyright Valve Corporation, All rights reserved. ============//
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#include "tier0/platform.h"
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#include "tier0/progressbar.h"
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#include "bitmap/float_bm.h"
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#include "mathlib/mathlib.h"
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#include "tier2/tier2.h"
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#include "tier0/memdbgon.h"
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#define SQ(x) ((x)*(x))
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int main( int argc, char ** argv )
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{
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InitCommandLineProgram( argc, argv );
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int nCurArg = 1;
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float flSpread = 1.0;
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bool bCodeChannel[4];
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bCodeChannel[0] = false;
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bCodeChannel[1] = false;
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bCodeChannel[2] = false;
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bCodeChannel[3] = true;
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while (( nCurArg < argc ) && ( argv[nCurArg][0] == '-' ) )
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{
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switch( argv[nCurArg][1] )
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{
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case 's': // spread
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{
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flSpread = atof( argv[++nCurArg] );
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}
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break;
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case '4': // encode all 4 channels
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{
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bCodeChannel[0] = true;
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bCodeChannel[1] = true;
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bCodeChannel[2] = true;
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}
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break;
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default:
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printf("unrecogized option %s\n", argv[nCurArg] );
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exit(1);
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}
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nCurArg++;
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}
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argc -= ( nCurArg - 1 );
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argv += ( nCurArg - 1 );
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if ( argc != 5 )
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{
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printf( "format is dist2alpha src_bm.tga dest_bm.tga dest_width dest_height\n" );
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exit( 1 );
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}
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FloatBitMap_t hires_image( argv[1] );
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int out_w = atoi( argv[3] );
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int out_h = atoi( argv[4] );
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FloatBitMap_t lores( out_w, out_h );
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float max_rad = 2.0 * flSpread * max( hires_image.Width * ( 1.0 / out_w ), hires_image.Height * ( 1.0 / out_h ));
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int irad = ceil( max_rad );
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for( int comp = 0;comp < 4;comp ++ )
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{
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for( int y = 0;y < out_h;y ++ )
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for( int x = 0;x < out_w;x ++ )
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{
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int orig_x = FLerp( 0, hires_image.Width - 1, 0, out_w - 1, x );
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int orig_y = FLerp( 0, hires_image.Height - 1, 0, out_h - 1, y );
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if ( bCodeChannel[ comp ] )
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{
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float closest_dist = 100000;
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int inside_test = ( hires_image.Pixel( orig_x, orig_y, comp ) >.9 );
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for( int oy =- irad;oy <= irad;oy ++ )
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for( int ox =- irad;ox <= irad;ox ++ )
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{
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int x1 = orig_x + ox;
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int y1 = orig_y + oy;
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if ( ( x1 >= 0 ) && ( x1 < hires_image.Width ) && ( y1 >= 0 ) && ( y1 < hires_image.Height ) &&
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( inside_test != ( hires_image.Pixel( orig_x + ox, orig_y + oy, comp ) >.9 )) )
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{
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float d2 = sqrt( (float ) ( SQ( ox ) + SQ( oy )) );
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if ( d2 < closest_dist )
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closest_dist = d2;
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}
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}
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// done
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float dnum = min( 0.5f, FLerp( 0, .5, 0, max_rad, closest_dist ));
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if ( !inside_test )
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dnum =- dnum;
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lores.Pixel( x, y, comp ) = 0.5 + dnum;
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}
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else
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lores.Pixel( x, y, comp ) = hires_image.Pixel( orig_x, orig_y, comp );
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}
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}
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lores.WriteTGAFile( argv[2] );
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return 0;
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}
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