On Fri, 23 Aug 2013 21:15:14 +0200, Søren Sandmann wrote:
> You probably want to set the extend mode to CAIRO_EXTEND_PAD by doing
> the C++ equivalent of this:
>
> cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
>
> after setting the pixbuf as the cairo source.
It really works, thanks!
Moreover I can even turn off the smoothing (not appropriate in my case):
auto
surfacepattern(Cairo::RefPtr<Cairo::SurfacePattern>::cast_dynamic(cr->get_source()));
surfacepattern->set_extend(Cairo::EXTEND_PAD);
surfacepattern->set_filter(Cairo::FILTER_NEAREST);
http://www.jankratochvil.net/t/2.png
Regards,
Jan Kratochvil
/*
g++ -o 1 1.C -Wall -Werror -std=gnu++11 -g $(pkg-config --cflags --libs
gtkmm-3.0);./1
*/
#include <gdkmm/general.h>
#include <gtkmm/main.h>
#include <gtkmm/window.h>
#include <gtkmm/drawingarea.h>
#include <vector>
#include <stdio.h>
using namespace std;
class Area:public Gtk::DrawingArea {
bool on_draw(const Cairo::RefPtr<Cairo::Context> &cr) {
// cr->translate(+0.5,+0.5);
class RGB {
public:
guint8 r=0,g=0,b=0;
};
vector<RGB> data24;
RGB rgb;
rgb.r=255; rgb.g=0 ; rgb.b=0 ; data24.push_back(rgb);
rgb.r=0 ; rgb.g=255; rgb.b=255; data24.push_back(rgb);
rgb.r=0 ; rgb.g=0 ; rgb.b=255; data24.push_back(rgb);
rgb.r=255; rgb.g=255; rgb.b=0 ; data24.push_back(rgb);
Glib::RefPtr<Gdk::Pixbuf> pixbuf;
pixbuf=Gdk::Pixbuf::create_from_data((const guint8
*)data24.data(),Gdk::COLORSPACE_RGB,false/*has_alpha*/,8/*bits_per_sample*/,
2 /*width*/,
2 /*height*/,
2*3/*rowstride==width*/);
// cr->set_identity_matrix();
{
cr->save();
// Does not work: cr->set_antialias(Cairo::ANTIALIAS_NONE);
// Does not work: cr->set_fill_rule(Cairo::FILL_RULE_EVEN_ODD);
cr->scale(double(get_allocation().get_width ())/pixbuf->get_width (),
double(get_allocation().get_height())/pixbuf->get_height());
Gdk::Cairo::set_source_pixbuf(cr,pixbuf);
auto
surfacepattern(Cairo::RefPtr<Cairo::SurfacePattern>::cast_dynamic(cr->get_source()));
surfacepattern->set_extend(Cairo::EXTEND_PAD);
surfacepattern->set_filter(Cairo::FILTER_NEAREST);
cr->rectangle(0,0,pixbuf->get_width(),pixbuf->get_height());
cr->fill();
cr->restore();
}
return true;
}
};
int main() {
Gtk::Main *app=new Gtk::Main();
Gtk::Window *win=new Gtk::Window();
win->set_default_size(500,500);
win->maximize();
win->add(*new Area());
win->show_all();
app->run(*win);
}
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