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Diffstat (limited to 'agg/inc/agg_pattern_filters_rgba.h')
-rwxr-xr-x | agg/inc/agg_pattern_filters_rgba.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/agg/inc/agg_pattern_filters_rgba.h b/agg/inc/agg_pattern_filters_rgba.h new file mode 100755 index 000000000000..5d194b2e39ba --- /dev/null +++ b/agg/inc/agg_pattern_filters_rgba.h @@ -0,0 +1,122 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +#ifndef AGG_PATTERN_FILTERS_RGBA8_INCLUDED +#define AGG_PATTERN_FILTERS_RGBA8_INCLUDED + +#include "agg_basics.h" +#include "agg_line_aa_basics.h" +#include "agg_color_rgba.h" + + +namespace agg +{ + + //=======================================================pattern_filter_nn + template<class ColorT> struct pattern_filter_nn + { + typedef ColorT color_type; + static unsigned dilation() { return 0; } + + static void AGG_INLINE pixel_low_res(color_type const* const* buf, + color_type* p, int x, int y) + { + *p = buf[y][x]; + } + + static void AGG_INLINE pixel_high_res(color_type const* const* buf, + color_type* p, int x, int y) + { + *p = buf[y >> line_subpixel_shift] + [x >> line_subpixel_shift]; + } + }; + + typedef pattern_filter_nn<rgba8> pattern_filter_nn_rgba8; + typedef pattern_filter_nn<rgba16> pattern_filter_nn_rgba16; + + + //===========================================pattern_filter_bilinear_rgba + template<class ColorT> struct pattern_filter_bilinear_rgba + { + typedef ColorT color_type; + typedef typename color_type::value_type value_type; + typedef typename color_type::calc_type calc_type; + + + static unsigned dilation() { return 1; } + + static AGG_INLINE void pixel_low_res(color_type const* const* buf, + color_type* p, int x, int y) + { + *p = buf[y][x]; + } + + static AGG_INLINE void pixel_high_res(color_type const* const* buf, + color_type* p, int x, int y) + { + calc_type r, g, b, a; + r = g = b = a = line_subpixel_size * line_subpixel_size / 2; + + calc_type weight; + int x_lr = x >> line_subpixel_shift; + int y_lr = y >> line_subpixel_shift; + + x &= line_subpixel_mask; + y &= line_subpixel_mask; + const color_type* ptr = buf[y_lr] + x_lr; + + weight = (line_subpixel_size - x) * + (line_subpixel_size - y); + r += weight * ptr->r; + g += weight * ptr->g; + b += weight * ptr->b; + a += weight * ptr->a; + + ++ptr; + + weight = x * (line_subpixel_size - y); + r += weight * ptr->r; + g += weight * ptr->g; + b += weight * ptr->b; + a += weight * ptr->a; + + ptr = buf[y_lr + 1] + x_lr; + + weight = (line_subpixel_size - x) * y; + r += weight * ptr->r; + g += weight * ptr->g; + b += weight * ptr->b; + a += weight * ptr->a; + + ++ptr; + + weight = x * y; + r += weight * ptr->r; + g += weight * ptr->g; + b += weight * ptr->b; + a += weight * ptr->a; + + p->r = (value_type)(r >> line_subpixel_shift * 2); + p->g = (value_type)(g >> line_subpixel_shift * 2); + p->b = (value_type)(b >> line_subpixel_shift * 2); + p->a = (value_type)(a >> line_subpixel_shift * 2); + } + }; + + typedef pattern_filter_bilinear_rgba<rgba8> pattern_filter_bilinear_rgba8; + typedef pattern_filter_bilinear_rgba<rgba16> pattern_filter_bilinear_rgba16; +} + +#endif |