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From 9422570f4e099a834fc43619f7b2a7eb6b442e25 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Sun, 19 May 2013 15:31:01 +0100
Subject: [PATCH 06/15] Implement grain-merge blending mode (GIMP)
---
include/agg_pixfmt_rgba.h | 42 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 40 insertions(+), 2 deletions(-)
diff --git a/include/agg_pixfmt_rgba.h b/include/agg_pixfmt_rgba.h
index 79d10dc..f576ce4 100644
--- a/include/agg_pixfmt_rgba.h
+++ b/include/agg_pixfmt_rgba.h
@@ -1401,9 +1401,46 @@ namespace agg
}
};
+ //================================================comp_op_rgba_grain_merge
+ template <typename ColorT, typename Order> struct comp_op_rgba_grain_merge
+ {
+ typedef ColorT color_type;
+ typedef Order order_type;
+ typedef typename color_type::value_type value_type;
+ typedef typename color_type::calc_type calc_type;
+ typedef typename color_type::long_type long_type;
+ enum base_scale_e
+ {
+ base_shift = color_type::base_shift,
+ base_mask = color_type::base_mask
+ };
+ // E = I + M - 128
+ static AGG_INLINE void blend_pix(value_type* p,
+ unsigned sr, unsigned sg, unsigned sb,
+ unsigned sa, unsigned cover)
+ {
-
+ if(cover < 255)
+ {
+ sr = (sr * cover + 255) >> 8;
+ sg = (sg * cover + 255) >> 8;
+ sb = (sb * cover + 255) >> 8;
+ sa = (sa * cover + 255) >> 8;
+ }
+ if(sa)
+ {
+ calc_type da = p[Order::A];
+ int dr = sr + p[Order::R] - 128;
+ int dg = sg + p[Order::G] - 128;
+ int db = sb + p[Order::B] - 128;
+ p[Order::R] = (value_type)(dr < 0 ? 0 : (dr > 255 ? 255 : dr));
+ p[Order::G] = (value_type)(dg < 0 ? 0 : (dg > 255 ? 255 : dg));
+ p[Order::B] = (value_type)(db < 0 ? 0 : (db > 255 ? 255 : db));
+ p[Order::A] = (value_type)(sa + da - ((sa * da + base_mask) >> base_shift));
+ }
+ }
+ };
//======================================================comp_op_table_rgba
template<class ColorT, class Order> struct comp_op_table_rgba
@@ -1451,6 +1488,7 @@ namespace agg
comp_op_rgba_contrast <ColorT,Order>::blend_pix,
comp_op_rgba_invert <ColorT,Order>::blend_pix,
comp_op_rgba_invert_rgb <ColorT,Order>::blend_pix,
+ comp_op_rgba_grain_merge<ColorT,Order>::blend_pix,
0
};
@@ -1486,6 +1524,7 @@ namespace agg
comp_op_contrast, //----comp_op_contrast
comp_op_invert, //----comp_op_invert
comp_op_invert_rgb, //----comp_op_invert_rgb
+ comp_op_grain_merge, //----comp_op_grain_merge
end_of_comp_op_e
};
@@ -2908,4 +2947,3 @@ namespace agg
}
#endif
-
--
1.8.1.4
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