Hi,
I'm trying to make an incremental update using Cairo for rendering.
How do I do this? I was hoping to write some code like this:
make_current();
cairo_set_source_rgba(cc, 0, 0, 1, 1);
cairo_set_line_width(cc, 7);
cairo_move_to(cc, 200, 200);
cairo_line_to(cc, 10, 10);
cairo_stroke(cc);
However cc was null and crashed the program. I updated run.cxx:
Widget::make_current() look like this:
void Widget::make_current() const {
int x = 0;
int y = 0;
const Widget* widget = this;
while (!widget->is_window()) {
x += widget->x();
y += widget->y();
widget = widget->parent();
}
const Window* window = (const Window*)widget;
Window::drawing_window_ = window;
fl_clip_w = window->w();
fl_clip_h = window->h();
dc = CreatedWindow::find( window )->dc;
#if USE_CAIRO
//cairo_invalidate_context();
cairo_surface_t * surface =cairo_win32_surface_create(dc);
cairo_invalidate_context();
cc = cairo_create(surface);
cairo_surface_destroy(surface);
#endif
fl_select_palette(dc);
load_identity();
translate(x,y);
}
Now I have a valid pointer for cc but when I resize the window, It is not
updated correctly.
btw - I'm using mingw on win32.
Any ideas about how I should proceed?
- Greg
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