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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// 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
//
//----------------------------------------------------------------------------
#ifndef AGG_RENDERING_BUFFER_INCLUDED
#define AGG_RENDERING_BUFFER_INCLUDED
#include "agg_basics.h"
namespace agg
{
class rendering_buffer
{
public:
struct row_data {
int x1, x2;
const int8u* ptr;
row_data() {}
row_data(int x1_, int x2_, const int8u* ptr_) :
x1(x1_), x2(x2_), ptr(ptr_) {}
};
struct span_data {
int x;
unsigned len;
int8u* ptr;
span_data() {}
span_data(int) : x(0), len(0), ptr(0) {}
span_data(int x_, unsigned len_, int8u* ptr_) :
x(x_), len(len_), ptr(ptr_) {}
};
~rendering_buffer()
{
FX_Free(m_rows);
}
rendering_buffer() :
m_buf(0),
m_rows(0),
m_width(0),
m_height(0),
m_stride(0),
m_max_height(0)
{
}
rendering_buffer(int8u* buf, unsigned width, unsigned height, int stride) :
m_buf(0),
m_rows(0),
m_width(0),
m_height(0),
m_stride(0),
m_max_height(0)
{
attach(buf, width, height, stride);
}
void attach(int8u* buf, unsigned width, unsigned height, int stride)
{
m_buf = buf;
m_width = width;
m_height = height;
m_stride = stride;
if(height > m_max_height) {
FX_Free(m_rows);
m_rows = FX_Alloc(int8u*, m_max_height = height);
}
int8u* row_ptr = m_buf;
if(stride < 0) {
row_ptr = m_buf - int(height - 1) * stride;
}
int8u** rows = m_rows;
while(height--) {
*rows++ = row_ptr;
row_ptr += stride;
}
}
int8u* buf()
{
return m_buf;
}
const int8u* buf() const
{
return m_buf;
}
unsigned width() const
{
return m_width;
}
unsigned height() const
{
return m_height;
}
int stride() const
{
return m_stride;
}
unsigned stride_abs() const
{
return (m_stride < 0) ?
unsigned(-m_stride) :
unsigned(m_stride);
}
int8u* row(unsigned y)
{
return m_rows[y];
}
const int8u* row(unsigned y) const
{
return m_rows[y];
}
int8u* next_row(void* p)
{
return (int8u*)p + m_stride;
}
const int8u* next_row(const void* p) const
{
return (int8u*)p + m_stride;
}
int8u const* const* rows() const
{
return m_rows;
}
private:
rendering_buffer(const rendering_buffer&);
const rendering_buffer& operator = (const rendering_buffer&);
private:
int8u* m_buf;
int8u** m_rows;
unsigned m_width;
unsigned m_height;
int m_stride;
unsigned m_max_height;
};
}
#endif
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