124 lines
4.1 KiB
C++
124 lines
4.1 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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#ifndef AGG_PATTERN_FILTERS_RGBA8_INCLUDED
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#define AGG_PATTERN_FILTERS_RGBA8_INCLUDED
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#include "agg_basics.h"
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#include "agg_line_aa_basics.h"
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#include "agg_color_rgba.h"
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namespace agg
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{
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//=======================================================pattern_filter_nn
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template<class ColorT> struct pattern_filter_nn
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{
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typedef ColorT color_type;
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static unsigned dilation() { return 0; }
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static void AGG_INLINE pixel_low_res(color_type const* const* buf,
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color_type* p, int x, int y)
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{
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*p = buf[y][x];
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}
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static void AGG_INLINE pixel_high_res(color_type const* const* buf,
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color_type* p, int x, int y)
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{
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*p = buf[y >> line_subpixel_shift]
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[x >> line_subpixel_shift];
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}
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};
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typedef pattern_filter_nn<rgba8> pattern_filter_nn_rgba8;
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typedef pattern_filter_nn<rgba16> pattern_filter_nn_rgba16;
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//===========================================pattern_filter_bilinear_rgba
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template<class ColorT> struct pattern_filter_bilinear_rgba
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{
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typedef ColorT color_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::calc_type calc_type;
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static unsigned dilation() { return 1; }
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static AGG_INLINE void pixel_low_res(color_type const* const* buf,
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color_type* p, int x, int y)
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{
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*p = buf[y][x];
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}
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static AGG_INLINE void pixel_high_res(color_type const* const* buf,
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color_type* p, int x, int y)
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{
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calc_type r, g, b, a;
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r = g = b = a = 0;
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calc_type weight;
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int x_lr = x >> line_subpixel_shift;
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int y_lr = y >> line_subpixel_shift;
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x &= line_subpixel_mask;
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y &= line_subpixel_mask;
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const color_type* ptr = buf[y_lr] + x_lr;
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weight = (line_subpixel_scale - x) *
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(line_subpixel_scale - y);
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r += weight * ptr->r;
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g += weight * ptr->g;
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b += weight * ptr->b;
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a += weight * ptr->a;
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++ptr;
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weight = x * (line_subpixel_scale - y);
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r += weight * ptr->r;
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g += weight * ptr->g;
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b += weight * ptr->b;
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a += weight * ptr->a;
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ptr = buf[y_lr + 1] + x_lr;
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weight = (line_subpixel_scale - x) * y;
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r += weight * ptr->r;
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g += weight * ptr->g;
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b += weight * ptr->b;
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a += weight * ptr->a;
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++ptr;
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weight = x * y;
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r += weight * ptr->r;
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g += weight * ptr->g;
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b += weight * ptr->b;
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a += weight * ptr->a;
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p->r = (value_type)color_type::downshift(r, line_subpixel_shift * 2);
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p->g = (value_type)color_type::downshift(g, line_subpixel_shift * 2);
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p->b = (value_type)color_type::downshift(b, line_subpixel_shift * 2);
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p->a = (value_type)color_type::downshift(a, line_subpixel_shift * 2);
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}
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};
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typedef pattern_filter_bilinear_rgba<rgba8> pattern_filter_bilinear_rgba8;
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typedef pattern_filter_bilinear_rgba<rgba16> pattern_filter_bilinear_rgba16;
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typedef pattern_filter_bilinear_rgba<rgba32> pattern_filter_bilinear_rgba32;
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}
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#endif
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