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146 lines
3.5 KiB
146 lines
3.5 KiB
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// class rendering_buffer
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_RENDERING_BUFFER_INCLUDED
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#define AGG_RENDERING_BUFFER_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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class rendering_buffer
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{
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public:
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struct row_data {
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int x1, x2;
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const int8u* ptr;
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row_data() {}
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row_data(int x1_, int x2_, const int8u* ptr_) :
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x1(x1_), x2(x2_), ptr(ptr_) {}
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};
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struct span_data {
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int x;
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unsigned len;
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int8u* ptr;
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span_data() {}
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span_data(int) : x(0), len(0), ptr(0) {}
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span_data(int x_, unsigned len_, int8u* ptr_) :
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x(x_), len(len_), ptr(ptr_) {}
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};
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~rendering_buffer()
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{
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FX_Free(m_rows);
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}
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rendering_buffer() :
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m_buf(0),
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m_rows(0),
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m_width(0),
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m_height(0),
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m_stride(0),
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m_max_height(0)
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{
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}
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rendering_buffer(int8u* buf, unsigned width, unsigned height, int stride) :
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m_buf(0),
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m_rows(0),
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m_width(0),
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m_height(0),
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m_stride(0),
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m_max_height(0)
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{
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attach(buf, width, height, stride);
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}
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void attach(int8u* buf, unsigned width, unsigned height, int stride)
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{
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m_buf = buf;
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m_width = width;
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m_height = height;
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m_stride = stride;
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if(height > m_max_height) {
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FX_Free(m_rows);
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m_rows = FX_Alloc(int8u*, m_max_height = height);
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}
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int8u* row_ptr = m_buf;
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if(stride < 0) {
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row_ptr = m_buf - int(height - 1) * stride;
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}
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int8u** rows = m_rows;
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while(height--) {
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*rows++ = row_ptr;
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row_ptr += stride;
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}
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}
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int8u* buf()
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{
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return m_buf;
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}
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const int8u* buf() const
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{
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return m_buf;
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}
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unsigned width() const
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{
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return m_width;
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}
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unsigned height() const
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{
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return m_height;
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}
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int stride() const
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{
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return m_stride;
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}
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unsigned stride_abs() const
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{
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return (m_stride < 0) ?
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unsigned(-m_stride) :
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unsigned(m_stride);
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}
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int8u* row(unsigned y)
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{
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return m_rows[y];
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}
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const int8u* row(unsigned y) const
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{
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return m_rows[y];
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}
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int8u* next_row(void* p)
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{
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return (int8u*)p + m_stride;
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}
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const int8u* next_row(const void* p) const
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{
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return (int8u*)p + m_stride;
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}
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int8u const* const* rows() const
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{
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return m_rows;
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}
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private:
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rendering_buffer(const rendering_buffer&);
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const rendering_buffer& operator = (const rendering_buffer&);
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private:
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int8u* m_buf;
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int8u** m_rows;
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unsigned m_width;
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unsigned m_height;
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int m_stride;
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unsigned m_max_height;
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};
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}
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#endif
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