diff options
Diffstat (limited to 'mktablec.pl')
| -rw-r--r-- | mktablec.pl | 40 |
1 files changed, 29 insertions, 11 deletions
diff --git a/mktablec.pl b/mktablec.pl index 32bb0d0..6467af0 100644 --- a/mktablec.pl +++ b/mktablec.pl @@ -13,7 +13,7 @@ # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software -# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA use strict ; use warnings ; @@ -35,19 +35,37 @@ sub shipsubarray (@) { print "\n" ; } +my $precompute_it = 1 ; +if( open CONFIGH, "<", "config.h" ) { + $precompute_it = 0 ; + while( <CONFIGH> ) { + if( /\#\s*define\s+PRECOMPUTED_SCALETABLE/ ) { + $precompute_it = 1 ; + last ; + } + } + close CONFIGH ; +} + print "/* Autogenerated by $0 */\n" ; print "#include \"pixels.h\"\n" ; -print "const uint8_t scaletable[256][256] = {\n" ; -for my $p ( 0..255 ) { - shipsubarray( map { int(($p*$_+127)/255) } ( 0 .. 255 ) ); - # This formula has the property that - # scaletable[p][q] + scaletable[255-p][q] == q - # for all uint8_t values of p and q. - # This is important in order that a partially transparent - # pixel does not change the color of the underlying pixel - # unless the two pixels have different colors. +print "#ifdef PRECOMPUTED_SCALETABLE\n" ; +if( $precompute_it ) { + print "const uint8_t scaletable[256][256] = {\n" ; + for my $p ( 0..255 ) { + shipsubarray( map { int(($p*$_+127)/255) } ( 0 .. 255 ) ); + # This formula has the property that + # scaletable[p][q] + scaletable[255-p][q] == q + # for all uint8_t values of p and q. + # This is important in order that a partially transparent + # pixel does not change the color of the underlying pixel + # unless the two pixels have different colors. + } + print "};\n" ; +} else { + print "#error PRECOMPUTED_SCALETABLE was not defined at generation time\n"; } -print "};\n" ; +print "#endif\n" ; if(0) { |