lazarus/components/aggpas/src/agg_span_pattern_rgb.pas

//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4 (Public License)
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Anti-Grain Geometry - Version 2.4 Release Milano 3 (AggPas 2.4 RM3)
// Pascal Port By: Milan Marusinec alias Milano
//                 milan@marusinec.sk
//                 http://www.aggpas.org
// Copyright (c) 2005-2006
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
//          mcseemagg@yahoo.com
//          http://www.antigrain.com
//
//----------------------------------------------------------------------------
//
// Adaptation for high precision colors has been sponsored by 
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
// [Pascal Port History] -----------------------------------------------------
//
// 23.06.2006-Milano: ptrcomp adjustments
// 06.03.2006-Milano: Unit port establishment
//
{ agg_span_pattern_rgb.pas {untested}
unit
 agg_span_pattern_rgb ;

INTERFACE

{$I agg_mode.inc }
{$Q- }
{$R- }
uses
 agg_basics ,
 agg_color ,
 agg_pixfmt ,
 agg_pixfmt_rgb ,
 agg_span_pattern ,
 agg_span_allocator ,
 agg_rendering_buffer ;

{ TYPES DEFINITION }
const
 base_shift = agg_color.base_shift;
 base_mask  = agg_color.base_mask;

type
 span_pattern_rgb_ptr = ^span_pattern_rgb;
 span_pattern_rgb = object(span_pattern_base )
   m_wrap_mode_x ,
   m_wrap_mode_y : wrap_mode_ptr;

   m_order : order_type;

   constructor Construct(alloc : span_allocator_ptr; WX ,WY : wrap_mode_ptr; order : order_type ); overload;
   constructor Construct(
                alloc : span_allocator_ptr;
                src : rendering_buffer_ptr;
                offset_x ,offset_y : unsigned;
                WX ,WY : wrap_mode_ptr;
                order : order_type;
                alpha : int8u = base_mask ); overload;

   procedure source_image_(src : rendering_buffer_ptr );

   function  generate(x ,y : int; len : unsigned ) : aggclr_ptr; virtual;

  end;

{ GLOBAL PROCEDURES }


IMPLEMENTATION
{ LOCAL VARIABLES & CONSTANTS }
{ UNIT IMPLEMENTATION }
{ CONSTRUCT }
constructor span_pattern_rgb.Construct(alloc : span_allocator_ptr; WX ,WY : wrap_mode_ptr; order : order_type );
begin
 inherited Construct(alloc );

 m_order:=order;

 m_wrap_mode_x:=WX;
 m_wrap_mode_y:=WY;

 m_wrap_mode_x.init(1 );
 m_wrap_mode_y.init(1 );

end;

{ CONSTRUCT }
constructor span_pattern_rgb.Construct(
             alloc : span_allocator_ptr;
             src : rendering_buffer_ptr;
             offset_x ,offset_y : unsigned;
             WX ,WY : wrap_mode_ptr;
             order : order_type;
             alpha : int8u = base_mask );
begin
 inherited Construct(alloc ,src ,offset_x ,offset_y ,alpha );

 m_order:=order;

 m_wrap_mode_x:=WX;
 m_wrap_mode_y:=WY;

 m_wrap_mode_x.init(src._width );
 m_wrap_mode_y.init(src._height );

end;

{ SOURCE_IMAGE_ }
procedure span_pattern_rgb.source_image_;
begin
 inherited source_image_(src );

 m_wrap_mode_x.init(src._width );
 m_wrap_mode_y.init(src._height );

end;

{ GENERATE }
function span_pattern_rgb.generate;
var
 span : aggclr_ptr;

 sx : unsigned;

 row_ptr ,p : int8u_ptr;

begin
 span:=_allocator.span;
 sx  :=m_wrap_mode_x.func_operator(_offset_x + x );

 row_ptr:=_source_image.row(m_wrap_mode_y.func_operator(_offset_y + y ) );

 repeat
  p:=int8u_ptr(ptrcomp(row_ptr ) + (sx + sx + sx ) * sizeof(int8u ) );

  span.r:=int8u_ptr(ptrcomp(p ) + m_order.R * sizeof(int8u ) )^;
  span.g:=int8u_ptr(ptrcomp(p ) + m_order.G * sizeof(int8u ) )^;
  span.b:=int8u_ptr(ptrcomp(p ) + m_order.B * sizeof(int8u ) )^;
  span.a:=_alpha_int;

  sx:=m_wrap_mode_x.inc_operator;

  inc(ptrcomp(span ) ,sizeof(aggclr ) );
  dec(len );

 until len = 0;

 result:=_allocator.span;

end;

END.