129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
//----------------------------------------------------------------------------
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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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// Conversion from one colorspace/pixel format to another
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_COLOR_CONV_INCLUDED
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#define AGG_COLOR_CONV_INCLUDED
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#include <cstring>
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#include "agg_basics.h"
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#include "agg_rendering_buffer.h"
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namespace agg
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{
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//--------------------------------------------------------------color_conv
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template<class RenBuf, class CopyRow>
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void color_conv(RenBuf* dst, const RenBuf* src, CopyRow copy_row_functor)
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{
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unsigned width = src->width();
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unsigned height = src->height();
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if(dst->width() < width) width = dst->width();
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if(dst->height() < height) height = dst->height();
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if(width)
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{
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unsigned y;
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for(y = 0; y < height; y++)
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{
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copy_row_functor(dst->row_ptr(0, y, width),
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src->row_ptr(y),
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width);
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}
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}
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}
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//---------------------------------------------------------color_conv_row
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template<class CopyRow>
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void color_conv_row(int8u* dst,
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const int8u* src,
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unsigned width,
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CopyRow copy_row_functor)
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{
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copy_row_functor(dst, src, width);
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}
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//---------------------------------------------------------color_conv_same
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template<int BPP> class color_conv_same
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{
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public:
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void operator () (int8u* dst,
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const int8u* src,
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unsigned width) const
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{
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std::memmove(dst, src, width*BPP);
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}
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};
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// Generic pixel converter.
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template<class DstFormat, class SrcFormat>
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struct conv_pixel
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{
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void operator()(void* dst, const void* src) const
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{
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// Read a pixel from the source format and write it to the destination format.
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DstFormat::write_plain_color(dst, SrcFormat::read_plain_color(src));
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}
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};
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// Generic row converter. Uses conv_pixel to convert individual pixels.
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template<class DstFormat, class SrcFormat>
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struct conv_row
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{
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void operator()(void* dst, const void* src, unsigned width) const
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{
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conv_pixel<DstFormat, SrcFormat> conv;
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do
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{
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conv(dst, src);
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dst = (int8u*)dst + DstFormat::pix_width;
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src = (int8u*)src + SrcFormat::pix_width;
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}
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while (--width);
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}
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};
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// Specialization for case where source and destination formats are identical.
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template<class Format>
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struct conv_row<Format, Format>
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{
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void operator()(void* dst, const void* src, unsigned width) const
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{
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std::memmove(dst, src, width * Format::pix_width);
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}
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};
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// Top-level conversion function, converts one pixel format to any other.
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template<class DstFormat, class SrcFormat, class RenBuf>
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void convert(RenBuf* dst, const RenBuf* src)
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{
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color_conv(dst, src, conv_row<DstFormat, SrcFormat>());
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}
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}
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#endif
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