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//----------------------------------------------------------------------------
// 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) 2005-2007
//
// 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
//
//----------------------------------------------------------------------------
//
// class rendering_buffer_dynarow
//
// [Pascal Port History] -----------------------------------------------------
//
// 06.10.2007-Milano: Unit port establishment
//
{ agg_rendering_buffer_dynarow.pas }
unit
agg_rendering_buffer_dynarow ;
INTERFACE
{$I agg_mode.inc }
uses
agg_basics ,
agg_rendering_buffer ;
{ TYPES DEFINITION }
type
//===============================================rendering_buffer_dynarow
// Rendering buffer class with dynamic allocation of the rows.
// The rows are allocated as needed when requesting for span_ptr().
// The class automatically calculates min_x and max_x for each row.
// Generally it's more efficient to use this class as a temporary buffer
// for rendering a few lines and then to blend it with another buffer.
rendering_buffer_dynarow_ptr = ^rendering_buffer_dynarow;
rendering_buffer_dynarow = object(rendering_buffer )
private
m_buff : row_data_type_ptr; // Pointers to each row of the buffer
m_alloc ,
m_byte_width : unsigned; // Width in bytes
public
constructor Construct(width ,height ,byte_width : unsigned );
destructor Destruct; virtual;
procedure init(width ,height ,byte_width : unsigned );
function _width : unsigned;
function _height : unsigned;
function _byte_width : unsigned;
function row_xy(x ,y : int; len : unsigned ) : int8u_ptr; virtual;
function row (y : unsigned ) : int8u_ptr; virtual;
end;
{ GLOBAL VARIABLES & CONSTANTS }
{ GLOBAL PROCEDURES }
IMPLEMENTATION
{ LOCAL VARIABLES & CONSTANTS }
{ UNIT IMPLEMENTATION }
{ CONSTRUCT }
// Allocate and clear the buffer
constructor rendering_buffer_dynarow.Construct(width ,height ,byte_width : unsigned );
begin
m_alloc:=sizeof(row_data_type ) * height;
agg_getmem(pointer(m_buff ) ,m_alloc );
m_width :=width;
m_height:=height;
m_byte_width:=byte_width;
FillChar(m_buff^ ,m_alloc ,0 );
end;
{ DESTRUCT }
destructor rendering_buffer_dynarow.Destruct;
begin
init(0 ,0 ,0 );
end;
{ INIT }
// Allocate and clear the buffer
procedure rendering_buffer_dynarow.init(width ,height ,byte_width : unsigned );
var
i : unsigned;
begin
i:=0;
while i < m_height do
begin
agg_freemem(
pointer(
row_data_type_ptr(ptrcomp(m_buff ) + i * sizeof(row_data_type ) ).ptr ) ,
m_byte_width );
inc(i );
end;
agg_freemem(pointer(m_buff ) ,m_alloc );
m_buff:=NIL;
if (width <> 0 ) and
(height <> 0 ) then
begin
m_width :=width;
m_height:=height;
m_byte_width:=byte_width;
m_alloc:=sizeof(row_data_type ) * height;
agg_getmem(pointer(m_buff ) ,m_alloc );
FillChar (m_buff^ ,m_alloc ,0 );
end;
end;
{ _WIDTH }
function rendering_buffer_dynarow._width : unsigned;
begin
result:=m_width;
end;
{ _HEIGHT }
function rendering_buffer_dynarow._height : unsigned;
begin
result:=m_height;
end;
{ _BYTE_WIDTH }
function rendering_buffer_dynarow._byte_width : unsigned;
begin
result:=m_byte_width;
end;
{ ROW_XY }
// The main function used for rendering. Returns pointer to the
// pre-allocated span. Memory for the row is allocated as needed.
function rendering_buffer_dynarow.row_xy(x ,y : int; len : unsigned ) : int8u_ptr;
var
r : row_data_type_ptr;
p : int8u_ptr;
x2 : int;
begin
r :=row_data_type_ptr(ptrcomp(m_buff ) + y * sizeof(row_data_type ) );
x2:=x + len - 1;
if r.ptr <> NIL then
begin
if x < r.x1 then
r.x1:=x;
if x2 > r.x2 then
r.x2:=x2;
end
else
begin
agg_getmem(pointer(p ) ,m_byte_width );
r.ptr:=p;
r.x1 :=x;
r.x2 :=x2;
FillChar(p^ ,m_byte_width ,0 );
end;
result:=r.ptr;
end;
{ ROW }
function rendering_buffer_dynarow.row(y : unsigned ) : int8u_ptr;
begin
result:=row_xy(0 ,y ,m_width );
end;
END.
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