142 lines
5 KiB
C
142 lines
5 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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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_dynarow
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_RENDERING_BUFFER_DYNAROW_INCLUDED
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#define AGG_RENDERING_BUFFER_DYNAROW_INCLUDED
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#include <string.h>
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#include "agg_basics.h"
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namespace agg
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{
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//===============================================rendering_buffer_dynarow
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// Rendering buffer class with dynamic allocation of the rows.
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// The rows are allocated as needed when requesting for span_ptr().
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// The class automatically calculates min_x and max_x for each row.
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// Generally it's more efficient to use this class as a temporary buffer
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// for rendering a few lines and then to blend it with another buffer.
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//
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class rendering_buffer_dynarow
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{
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public:
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//----------------------------------------------------------------------
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struct row_data
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{
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int x1, x2;
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const int8u* ptr;
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};
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//-------------------------------------------------------------------
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~rendering_buffer_dynarow()
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{
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init(0,0,0);
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}
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//-------------------------------------------------------------------
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rendering_buffer_dynarow() :
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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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{
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}
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// Allocate and clear the buffer
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//--------------------------------------------------------------------
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rendering_buffer_dynarow(unsigned width, unsigned height,
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unsigned byte_width) :
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m_rows(new row_data[height]),
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m_width(width),
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m_height(height),
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m_byte_width(byte_width)
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{
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memset(m_rows, 0, sizeof(row_data) * height);
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}
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// Allocate and clear the buffer
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//--------------------------------------------------------------------
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void init(unsigned width, unsigned height, unsigned byte_width)
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{
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unsigned i;
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for(i = 0; i < m_height; ++i) delete [] (int8u*)m_rows[i].ptr;
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delete [] m_rows;
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m_rows = 0;
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if(width && height)
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{
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m_width = width;
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m_height = height;
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m_byte_width = byte_width;
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m_rows = new row_data[height];
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memset(m_rows, 0, sizeof(row_data) * height);
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}
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}
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//--------------------------------------------------------------------
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unsigned width() const { return m_width; }
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unsigned height() const { return m_height; }
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unsigned byte_width() const { return m_byte_width; }
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// The main function used for rendering. Returns pointer to the
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// pre-allocated span. Memory for the row is allocated as needed.
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//--------------------------------------------------------------------
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int8u* row_ptr(int x, int y, unsigned len)
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{
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row_data* r = m_rows + y;
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int x2 = x + len - 1;
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if(r->ptr)
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{
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if(x < r->x1) { r->x1 = x; }
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if(x2 > r->x2) { r->x2 = x2; }
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}
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else
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{
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int8u* p = new int8u [m_byte_width];
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r->ptr = p;
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r->x1 = x;
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r->x2 = x2;
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memset(p, 0, m_byte_width);
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}
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return (int8u*)r->ptr;
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}
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//--------------------------------------------------------------------
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const int8u* row_ptr(int y) const { return m_rows[y].ptr; }
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int8u* row_ptr(int y) { return row_ptr(0, y, m_width); }
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row_data row (int y) const { return m_rows[y]; }
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private:
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//--------------------------------------------------------------------
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// Prohibit copying
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rendering_buffer_dynarow(const rendering_buffer_dynarow&);
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const rendering_buffer_dynarow& operator = (const rendering_buffer_dynarow&);
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private:
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//--------------------------------------------------------------------
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row_data* m_rows; // Pointers to each row of the buffer
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unsigned m_width; // Width in pixels
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unsigned m_height; // Height in pixels
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unsigned m_byte_width; // Width in bytes
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};
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}
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#endif
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