From b60ef5570f005374e688d62c69017543befca74e Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@Adaptics.local>
Date: Tue, 5 Nov 2013 15:05:23 +0000
Subject: overlay in blend mode

---
 rotord/src/cvimage.cpp      | 12 ++++++++++++
 rotord/src/cvimage.h        |  8 ++++++++
 rotord/src/nodes_channels.h |  6 +++++-
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/rotord/src/cvimage.cpp b/rotord/src/cvimage.cpp
index 74a21dd..8f2c181 100644
--- a/rotord/src/cvimage.cpp
+++ b/rotord/src/cvimage.cpp
@@ -138,6 +138,18 @@ namespace Rotor {
 		//}
 		return *this;
 	}
+	Image & Image::overlay(cv::Mat &other){
+		if (other.w!=w||other.h!=h) {
+			cerr<<"Rotor: cannot overlay images with different sizes! (wanted "<<w<<"x"<<h<<", got "<<other.w<<"x"<<other.h<<")"<<endl;
+			//why not??
+		}
+		else {
+			for (int i=0;i<h*w*3;i++) {
+			rgb.data[i]=pixels.overlsy[rgb.data[i]][other.rgb.data[i]];
+			}
+		}
+		return *this;
+	}
 	Image & Image::operator=(const Image &other) {
 		//can be optimised? was trying to use other.data.clone()
 		setup(other.w,other.h);
diff --git a/rotord/src/cvimage.h b/rotord/src/cvimage.h
index 8a6fdae..a0a2cf4 100644
--- a/rotord/src/cvimage.h
+++ b/rotord/src/cvimage.h
@@ -29,12 +29,15 @@ namespace Rotor {
 			pixeltables(){
 				add=new uint8_t*[256];
 				multiply=new uint8_t*[256];
+				overlay=new uint8_t*[256];
 				for (int i=0;i<256;i++){
 					add[i]=new uint8_t[256];
 					multiply[i]=new uint8_t[256];
+					overlay[i]=new uint8_t[256];
 					for (int j=0;j<256;j++){
 						add[i][j]=(uint8_t)std::min(i+j,0xFF);
 						multiply[i][j]=(uint8_t)(((float)i)*(((float)j)/255.0f));
+						overlay[i][j]=j<128?(uint8_t)((i*j)>>7):255-(((0xFF-i)*(0xFF-j))>>7);
 					}
 				}
 				mono_weights=new uint8_t*[3];
@@ -50,9 +53,11 @@ namespace Rotor {
 				for (int i=0;i<256;i++){
 					delete[] add[i];
 					delete[] multiply[i];
+					delete[] overlay[i];
 				}
 				delete[] add;
 				delete[] multiply;
+				delete[] overlay;
 				for (int i=0;i<3;i++) {
 					delete[] mono_weights[i];
 				}
@@ -60,7 +65,9 @@ namespace Rotor {
 			}
 			uint8_t **add;
 			uint8_t **multiply;
+			uint8_t **overlay;
 			uint8_t **mono_weights;
+
 	};
 	static pixeltables pixels;
 	class Image{
@@ -200,6 +207,7 @@ namespace Rotor {
 			Image & alpha_from_cv(cv::Mat &other);
 			Image &	add_wrap(const Image &other);
 			Image & divide_wrap(const Image &other);
+			Image & overlay(const Image &other);
 			Image & operator*=(const float &amount);
 			Image & operator+=(const float &amount);
 			Image & operator-=(const float &amount);
diff --git a/rotord/src/nodes_channels.h b/rotord/src/nodes_channels.h
index fe129ea..e991660 100644
--- a/rotord/src/nodes_channels.h
+++ b/rotord/src/nodes_channels.h
@@ -69,13 +69,14 @@ namespace Rotor {
 #define BLEND_alpha 4
 #define BLEND_wrap 5
 #define BLEND_xor 6
+#define BLEND_overlay 7
 	class Blend: public Image_node {
 		public:
 			Blend(){
 				create_image_input("image input 1","Image input 1");
 				create_image_input("image input 2","Image input 2");
 				create_parameter("amount","number","amount to blend input 2","Blend amount",0.5f,0.0f,1.0f);
-				create_attribute("mode","Blend mode","Blend mode","blend",{"blend","screen","multiply","alpha","wrap","xor"});
+				create_attribute("mode","Blend mode","Blend mode","blend",{"blend","screen","multiply","alpha","wrap","xor","overlay"});
 				title ="Blend";
 				description="Blend images in various modes";
 				UID="12ed7af0-2d0a-11e3-ae32-2b44203b93c9";
@@ -107,6 +108,9 @@ namespace Rotor {
 							case BLEND_wrap:
 								image=image.add_wrap(*in2);
 								break;
+							case BLEND_overlay:
+								image=image.overlay(*in2);
+								break;
 							case BLEND_blend: //has to be last because of initialser of *in? go figure
 
 								image*=(1.0f-parameters["amount"]->value);
-- 
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