cairo library and first drawing node

1 files changed, 43 insertions, 0 deletions

diff --git a/rotord/nodes_drawing.h b/rotord/nodes_drawing.h
new file mode 100644
index 0000000..11df2d6
--- /dev/null
+++ b/rotord/nodes_drawing.h
@@ -0,0 +1,43 @@
+#ifndef ROTOR_NODES_DRAWING
+#define ROTOR_NODES_DRAWING
+
+#include "rotor.h"
+#include <cairo.h>
+
+namespace Rotor {
+	class Draw: public Image_node {
+		public:
+			Draw(){image=nullptr;};
+			Draw(map<string,string> &settings) {
+				base_settings(settings);
+			};
+			~Draw(){ if (image) delete image;};
+			Draw* clone(map<string,string> &_settings) { return new Draw(_settings);};
+			Image *output(const Frame_spec &frame){
+				if (image_inputs.size()) {
+					if (image_inputs[0]->connection){
+						//copy incoming image **writable
+						if (image) delete image;
+						image=(((Image_node*)image_inputs[0]->connection)->get_output(frame))->clone();                 
+	                }
+	                else image->setup(frame.w,frame.h);
+			    }
+			    else image->setup(frame.w,frame.h); //do this twice or use a goto			    
+			    //draw onto new or input image
+			    cairo_surface_t * cs = cairo_image_surface_create_for_data (image->RGBdata,
+                                                         CAIRO_FORMAT_RGB24,
+                                                         image->w,
+                                                         image->h,
+                                                         image->getStride());
+			    cairo_t *c=cairo_create(cs);
+			    cairo_rectangle(c, image->w/2, image->h/2, image->w, image->h);
+				cairo_set_source_rgb(c, 1.0, 0.0, 0.0);
+				cairo_fill(c);
+				return image;
+			}
+		private:
+			Image *image; //is an image generator
+	};
+}
+
+#endif
\ No newline at end of file