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54 lines
1.2 KiB
54 lines
1.2 KiB
#include <ntqimage.h>
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#include <ntqcolor.h>
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static inline int blendComponent( int v, int av, int s, int as )
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{
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return as*s + av*v -(av*as*s)/255;
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}
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static inline TQRgb blendShade( TQRgb v, TQRgb s )
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{
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//shadow image is already reduced and blurred
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int as = tqAlpha(s);
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int av = tqAlpha(v);
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if ( as == 0 || av == 255 )
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return v;
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int a = as + av -(as*av)/255;
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int r = blendComponent( tqRed(v),av, tqRed(s), as)/a;
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int g = blendComponent( tqGreen(v),av, tqGreen(s), as)/a;
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int b = blendComponent( tqBlue(v),av, tqBlue(s), as)/a;
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return tqRgba(r,g,b,a);
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}
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int main( int*, char**)
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{
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TQImage image( "out.png" );
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image.convertDepth( 32 );
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TQImage shade( "outshade.png" );
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shade.convertDepth( 32 );
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int dx = 10;
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int dy = 5;
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int w = image.width();
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int h = image.height();
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TQImage img( w+dx, h+dy, 32 );
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img.setAlphaBuffer( TRUE );
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for ( int y = 0; y < h+dy; y++ ) {
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for ( int x = 0; x < w+dx; x++ ) {
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TQRgb sh = (x<dx||y<dy) ? 0 : shade.pixel( x-dx, y-dy );
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TQRgb pixel = (x<w&y<h) ? image.pixel( x, y ) : 0;
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img.setPixel( x, y, blendShade( pixel, sh ) );
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}
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}
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img.save("blend.png", "PNG" );
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}
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