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#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) {
image=nullptr;
base_settings(settings);
if(CAIRO_HAS_IMAGE_SURFACE==1) {
cerr<<"cairo has image surface"<<endl;
}
};
~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 {
if (!image) image =new Image();
image->setup(frame.w,frame.h);
}
}
else {
if (!image) image =new Image();
image->setup(frame.w,frame.h); //do this twice or use a goto
}
//draw onto new or input image
//image->convert32(); //pad frame out to 32 bits for cairo
//turns out cairo doesn't draw at all if the stride definition is wrong
//crashes like this though
cv::Mat chans;
cv::cvtColor(image->rgb, chans, CV_RGB2RGBA, 4);
cairo_surface_t * cs = cairo_image_surface_create_for_data (chans.data,
CAIRO_FORMAT_RGB24,
image->w,
image->h,
image->w*4);
cairo_t * cr = cairo_create (cs);
cairo_rectangle(cr, 0,0, image->w/2, image->h/2);
cairo_set_source_rgb(cr, 0,1.0,0); //cairo colour is 0.0->1.0
cairo_fill(cr);
cairo_text_extents_t te;
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
cairo_select_font_face (cr, "Georgia",
CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 20);
cairo_text_extents (cr, "hello world!", &te);
cairo_move_to (cr, 20,20);
cairo_show_text (cr, "hello world!");
cairo_fill(cr);
//image->convert24(); //convert frame back to 24 bits
cv::cvtColor(chans,image->rgb,CV_RGBA2RGB,3);
return image;
}
private:
Image *image; //is an image generator
};
}
#endif
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