overlay in blend mode

1 files changed, 8 insertions, 0 deletions

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);