86 lines
2.9 KiB
Diff
86 lines
2.9 KiB
Diff
From abd440342e166a90d08610bf5b31d2a8357eafbe Mon Sep 17 00:00:00 2001
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From: Tom Hughes <tom@compton.nu>
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Date: Sun, 19 May 2013 15:43:18 +0100
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Subject: [PATCH 07/15] Implement grain-extract blending mode (GIMP)
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---
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include/agg_pixfmt_rgba.h | 48 +++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 48 insertions(+)
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diff --git a/include/agg_pixfmt_rgba.h b/include/agg_pixfmt_rgba.h
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index f576ce4..42f0a05 100644
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--- a/include/agg_pixfmt_rgba.h
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+++ b/include/agg_pixfmt_rgba.h
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@@ -1442,6 +1442,52 @@ namespace agg
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}
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};
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+ //==============================================comp_op_rgba_grain_extract
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+ template <typename ColorT, typename Order> struct comp_op_rgba_grain_extract
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+ {
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+ typedef ColorT color_type;
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+ typedef Order order_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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+ typedef typename color_type::long_type long_type;
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+ enum base_scale_e
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+ {
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+ base_shift = color_type::base_shift,
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+ base_mask = color_type::base_mask
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+ };
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+
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+ // E = I - M + 128
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+ static AGG_INLINE void blend_pix(value_type* p,
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+ unsigned sr, unsigned sg, unsigned sb,
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+ unsigned sa, unsigned cover)
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+ {
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+ calc_type da = (p[Order::A] * sa + 255) >> 8;
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+
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+ int dr = p[Order::R] - sr + 128;
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+ int dg = p[Order::G] - sg + 128;
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+ int db = p[Order::B] - sb + 128;
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+
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+ dr = dr < 0 ? 0 : (dr > 255 ? 255 : dr);
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+ dg = dg < 0 ? 0 : (dg > 255 ? 255 : dg);
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+ db = db < 0 ? 0 : (db > 255 ? 255 : db);
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+
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+ p[Order::A] = da;
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+
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+ if(da < 255)
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+ {
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+ p[Order::R] = (dr * da + 255) >> 8;
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+ p[Order::G] = (dg * da + 255) >> 8;
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+ p[Order::B] = (db * da + 255) >> 8;
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+ }
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+ else
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+ {
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+ p[Order::R] = dr;
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+ p[Order::G] = dg;
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+ p[Order::B] = db;
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+ }
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+ }
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+ };
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+
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//======================================================comp_op_table_rgba
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template<class ColorT, class Order> struct comp_op_table_rgba
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{
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@@ -1489,6 +1535,7 @@ namespace agg
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comp_op_rgba_invert <ColorT,Order>::blend_pix,
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comp_op_rgba_invert_rgb <ColorT,Order>::blend_pix,
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comp_op_rgba_grain_merge<ColorT,Order>::blend_pix,
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+ comp_op_rgba_grain_extract<ColorT,Order>::blend_pix,
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0
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};
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@@ -1525,6 +1572,7 @@ namespace agg
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comp_op_invert, //----comp_op_invert
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comp_op_invert_rgb, //----comp_op_invert_rgb
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comp_op_grain_merge, //----comp_op_grain_merge
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+ comp_op_grain_extract, //----comp_op_grain_extract
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end_of_comp_op_e
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};
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--
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1.8.1.4
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