cffgload.c

下载来的一个看图软件的源代码

            y += args[0];
            cff_builder_add_point( builder, x, y, 0 );
            x += args[1];
            y += args[2];
            cff_builder_add_point( builder, x, y, 0 );
            y += args[3];
            cff_builder_add_point( builder, x, y, 1 );
            args += 4;
          }
          args = stack;
          break;

        case cff_op_hhcurveto:
          FT_TRACE4(( " hhcurveto" ));

          if ( cff_builder_start_point ( builder, x, y ) )
            goto Memory_Error;

          args = stack;
          if ( num_args & 1 )
          {
            y += args[0];
            args++;
            num_args--;
          }

          if ( num_args % 4 != 0 )
            goto Stack_Underflow;

          if ( check_points( builder, 3 * ( num_args / 4 ) ) )
            goto Memory_Error;

          while ( args < decoder->top )
          {
            x += args[0];
            cff_builder_add_point( builder, x, y, 0 );
            x += args[1];
            y += args[2];
            cff_builder_add_point( builder, x, y, 0 );
            x += args[3];
            cff_builder_add_point( builder, x, y, 1 );
            args += 4;
          }
          args = stack;
          break;

        case cff_op_vhcurveto:
        case cff_op_hvcurveto:
          {
            FT_Int  phase;


            FT_TRACE4(( op == cff_op_vhcurveto ? " vhcurveto"
                                               : " hvcurveto" ));

            if ( cff_builder_start_point ( builder, x, y ) )
              goto Memory_Error;

            args = stack;
            if (num_args < 4 || ( num_args % 4 ) > 1 )
              goto Stack_Underflow;

            if ( check_points( builder, ( num_args / 4 ) * 3 ) )
              goto Stack_Underflow;

            phase = ( op == cff_op_hvcurveto );

            while ( num_args >= 4 )
            {
              num_args -= 4;
              if ( phase )
              {
                x += args[0];
                cff_builder_add_point( builder, x, y, 0 );
                x += args[1];
                y += args[2];
                cff_builder_add_point( builder, x, y, 0 );
                y += args[3];
                if ( num_args == 1 )
                  x += args[4];
                cff_builder_add_point( builder, x, y, 1 );
              }
              else
              {
                y += args[0];
                cff_builder_add_point( builder, x, y, 0 );
                x += args[1];
                y += args[2];
                cff_builder_add_point( builder, x, y, 0 );
                x += args[3];
                if ( num_args == 1 )
                  y += args[4];
                cff_builder_add_point( builder, x, y, 1 );
              }
              args  += 4;
              phase ^= 1;
            }
            args = stack;
          }
          break;

        case cff_op_rlinecurve:
          {
            FT_Int  num_lines = ( num_args - 6 ) / 2;


            FT_TRACE4(( " rlinecurve" ));

            if ( num_args < 8 || ( num_args - 6 ) & 1 )
              goto Stack_Underflow;

            if ( cff_builder_start_point( builder, x, y ) ||
                 check_points( builder, num_lines + 3 )   )
              goto Memory_Error;

            args = stack;

            /* first, add the line segments */
            while ( num_lines > 0 )
            {
              x += args[0];
              y += args[1];
              cff_builder_add_point( builder, x, y, 1 );
              args += 2;
              num_lines--;
            }

            /* then the curve */
            x += args[0];
            y += args[1];
            cff_builder_add_point( builder, x, y, 0 );
            x += args[2];
            y += args[3];
            cff_builder_add_point( builder, x, y, 0 );
            x += args[4];
            y += args[5];
            cff_builder_add_point( builder, x, y, 1 );
            args = stack;
          }
          break;

        case cff_op_rcurveline:
          {
            FT_Int  num_curves = ( num_args - 2 ) / 6;


            FT_TRACE4(( " rcurveline" ));

            if ( num_args < 8 || ( num_args - 2 ) % 6 )
              goto Stack_Underflow;

            if ( cff_builder_start_point ( builder, x, y ) ||
                 check_points( builder, num_curves*3 + 2 ) )
              goto Memory_Error;

            args = stack;

            /* first, add the curves */
            while ( num_curves > 0 )
            {
              x += args[0];
              y += args[1];
              cff_builder_add_point( builder, x, y, 0 );
              x += args[2];
              y += args[3];
              cff_builder_add_point( builder, x, y, 0 );
              x += args[4];
              y += args[5];
              cff_builder_add_point( builder, x, y, 1 );
              args += 6;
              num_curves--;
            }

            /* then the final line */
            x += args[0];
            y += args[1];
            cff_builder_add_point( builder, x, y, 1 );
            args = stack;
          }
          break;

        case cff_op_hflex1:
          {
            FT_Pos start_y;


            FT_TRACE4(( " hflex1" ));

            args = stack;

            /* adding five more points; 4 control points, 1 on-curve point */
            /* make sure we have enough space for the start point if it    */
            /* needs to be added..                                         */
            if ( cff_builder_start_point( builder, x, y ) ||
                 check_points( builder, 6 )               )
              goto Memory_Error;

            /* Record the starting point's y postion for later use */
            start_y = y;

            /* first control point */
            x += args[0];
            y += args[1];
            cff_builder_add_point( builder, x, y, 0 );

            /* second control point */
            x += args[2];
            y += args[3];
            cff_builder_add_point( builder, x, y, 0 );

            /* join point; on curve, with y-value the same as the last */
            /* control point's y-value                                 */
            x += args[4];
            cff_builder_add_point( builder, x, y, 1 );

            /* third control point, with y-value the same as the join */
            /* point's y-value                                        */
            x += args[5];
            cff_builder_add_point( builder, x, y, 0 );

            /* fourth control point */
            x += args[6];
            y += args[7];
            cff_builder_add_point( builder, x, y, 0 );

            /* ending point, with y-value the same as the start   */
            x += args[8];
            y  = start_y;
            cff_builder_add_point( builder, x, y, 1 );

            args = stack;
            break;
          }

        case cff_op_hflex:
          {
            FT_Pos start_y;


            FT_TRACE4(( " hflex" ));

            args = stack;

            /* adding six more points; 4 control points, 2 on-curve points */
            if ( cff_builder_start_point( builder, x, y ) ||
                 check_points ( builder, 6 )              )
              goto Memory_Error;

            /* record the starting point's y-position for later use */
            start_y = y;

            /* first control point */
            x += args[0];
            cff_builder_add_point( builder, x, y, 0 );

            /* second control point */
            x += args[1];
            y += args[2];
            cff_builder_add_point( builder, x, y, 0 );

            /* join point; on curve, with y-value the same as the last */
            /* control point's y-value                                 */
            x += args[3];
            cff_builder_add_point( builder, x, y, 1 );

            /* third control point, with y-value the same as the join */
            /* point's y-value                                        */
            x += args[4];
            cff_builder_add_point( builder, x, y, 0 );

            /* fourth control point */
            x += args[5];
            y  = start_y;
            cff_builder_add_point( builder, x, y, 0 );

            /* ending point, with y-value the same as the start point's */
            /* y-value -- we don't add this point, though               */
            x += args[6];
            cff_builder_add_point( builder, x, y, 1 );

            args = stack;
            break;
          }

        case cff_op_flex1:
          {
            FT_Pos  start_x, start_y; /* record start x, y values for alter */
                                      /* use                                */
            FT_Int  dx = 0, dy = 0;   /* used in horizontal/vertical        */
                                      /* algorithm below                    */
            FT_Int  horizontal, count;


            FT_TRACE4(( " flex1" ));

            /* adding six more points; 4 control points, 2 on-curve points */
            if ( cff_builder_start_point( builder, x, y ) ||
                 check_points( builder, 6 )               )
               goto Memory_Error;

            /* record the starting point's x, y postion for later use */
            start_x = x;
            start_y = y;

            /* XXX: figure out whether this is supposed to be a horizontal */
            /*      or vertical flex; the Type 2 specification is vague... */

            args = stack;

            /* grab up to the last argument */
            for ( count = 5; count > 0; count-- )
            {
              dx += (FT_Int)args[0];
              dy += (FT_Int)args[1];
              args += 2;
            }

            /* rewind */
            args = stack;

            if ( dx < 0 ) dx = -dx;
            if ( dy < 0 ) dy = -dy;

            /* strange test, but here it is... */
            horizontal = ( dx > dy );

            for ( count = 5; count > 0; count-- )
            {
              x += args[0];
              y += args[1];
              cff_builder_add_point( builder, x, y, (FT_Bool)( count == 3 ) );
              args += 2;
            }

            /* is last operand an x- or y-delta? */
            if ( horizontal )
            {
              x += args[0];
              y  = start_y;
            }
            else
            {
              x  = start_x;
              y += args[0];
            }

            cff_builder_add_point( builder, x, y, 1 );

            args = stack;
            break;
           }

        case cff_op_flex:
          {
            FT_UInt  count;


            FT_TRACE4(( " flex" ));

            if ( cff_builder_start_point( builder, x, y ) ||
                 check_points( builder, 6 )               )
              goto Memory_Error;

            args = stack;
            for ( count = 6; count > 0; count-- )
            {
              x += args[0];
              y += args[1];
              cff_builder_add_point( builder, x, y,
                                     (FT_Bool)( count == 3 || count == 0 ) );
              args += 2;
            }

            args = stack;
          }
          break;

        case cff_op_endchar:
          FT_TRACE4(( " endchar" ));

          /* We are going to emulate the seac operator. */
          if ( num_args == 4 )
          {
            error = cff_operator_seac( decoder,
                                       args[0] >> 16,
                                       args[1] >> 16,
                                       (FT_Int)( args[2] >> 16 ),
                                       (FT_Int)( args[3] >> 16 ) );
            args += 4;
          }

          if ( !error )
            error = CFF_Err_Ok;

          cff_builder_close_contour( builder );

          /* close hints recording session */
          if ( hinter )
          {
            if (hinter->close( hinter->hints, builder->current->n_points ) )
              goto Syntax_Error;

            /* apply hints to the loaded glyph outline now */
            hinter->apply( hinter->hints,
                           builder->current,
                           (PSH_Globals)builder->hints_globals,
                           decoder->hint_mode );
          }

          /* add current outline to the glyph slot */
          FT_GlyphLoader_Add( builder->loader );

          /* return now! */
          FT_TRACE4(( "\n\n" ));
          return error;

        case cff_op_abs:
          FT_TRACE4(( " abs" ));

          if ( args[0] < 0 )
            args[0] = -args[0];
          args++;
          break;

        case cff_op_add:
          FT_TRACE4(( " add" ));

          args[0] += args[1];
          args++;
          break;

        case cff_op_sub:
          FT_TRACE4(( " sub" ));

          args[0] -= args[1];
          args++;
          break;

        case cff_op_div:
          FT_TRACE4(( " div" ));

          args[0] = FT_DivFix( args[0], args[1] );
          args++;
          break;

        case cff_op_neg:
          FT_TRACE4(( " neg" ));

          args[0] = -args[0];
          args++;
          break;

        case cff_op_random:
          {
            FT_Fixed  Rand;