Ok so should this function? gray32f_view_t noise = interleaved_view( width, height , (gray32f_pixel_t*) &pBuffer[0] , width * sizeof(float) // bytes per scanline ); gray32f_view_t src = subimage_view(noise,0,0,half_width,half_height); copy_pixels( flipped_left_right_view(src), subimage_view(noise,half_width,0,half_width,half_height) ); copy_pixels( flipped_up_down_view(src), subimage_view(noise,0,half_height,half_width,half_height) ); copy_pixels( transposed_view(src), subimage_view(noise,half_width,half_height,half_width,half_height) ); Christian Henning wrote:
Michael,
here is my version of your algorithm. Please have a look:
std::vector<float> buffer( 1024 * 1024 ); //GenerateNoise( pBuffer, 1024, 1024 )
gray32f_view_t src = interleaved_view( 1024, 1024 , (gray32f_pixel_t*) &buffer.front() , 1024 * 4 // bytes per scanline );
for( int y = 0; y < src.height(); ++y ) { gray32f_view_t::x_iterator src_it = src.row_begin( y );
float ycopy = y; if(y > 511) { ycopy = 511 - std::abs( 512.f - ycopy ); }
for( int x = 0; x < src.width(); ++x ) { float xcopy = x;
if(x > 511) { xcopy = 511 - std::abs( 512.f - xcopy ); }
src_it[x] = src[xcopy][ycopy]; } }