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+//----------------------------------------------------------------------------
+// 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