Le mardi 23 mai 2006 à 11:21 +0200, Jean Bréfort a écrit :
> Le mardi 23 mai 2006 à 11:04 +0200, Emmanuel Pacaud a écrit :
> > Hi,
> >
> > Here's some words on what I'm working on currently.
> >
> > Last weeks, I've tried to finalize the cairo SVG backend for its
> > inclusion as supported backend. So I hope next stable cairo will have
> > good PDF, PS and SVG backends.
> >
> > It will then be possible to ditch our current rendering engine and
> > replace it by a simplified one, based on cairo.
> >
> > So my plan is to implement this simplified engine, and validate it by
> > using it in two plot plugins, via a new GogView::cairo_render.
> >
> > Here's the current in-progress API:
> >
> > typedef struct _GOPathPoint GOPathPoint;
> >
> > GOPath *go_path_new (void);
> > GOPath *go_path_new_with_size (int size);
> > void go_path_free (GOPath *path);
> >
> > void go_path_set_sharp (GOPath *path, gboolean sharp);
> >
> > void go_path_move_to (GOPath *path, double x, double y);
> > void go_path_line_to (GOPath *path, double x, double y);
> > void go_path_curve_to (GOPath *path, double x0, double y0,
> > double x1, double y1,
> > double x2, double y2);
> > void go_path_rectangle (GOPath *path, double x, double y,
> > double width, double height);
> > void go_path_ring_wedge (GOPath *path, double cx, double xy,
> > double rx_out, double ry_out,
> > double rx_in, double ry_in,
> > double th0, double th1);
> > void go_path_arc (GOPath *path, double cx, double cy,
> > double rx, double ry,
> > double th0, double th1);
> > void go_path_pie_wedge (GOPath *path, double cx, double cy,
> > double rx, double ry,
> > double th0, double th1);
> > void go_path_marker (GOPath *path);
> > void go_path_close (GOPath *path);
> >
> > typedef struct _GOCairo GOCairo;
> >
> > GOCairo *go_cairo_new (void);
> > void go_cairo_free (GOCairo *gcairo);
> >
> > void go_cairo_push_style (GOCairo *gcairo, GogStyle const *style);
> > void go_cairo_pop_style (GOCairo *gcairo);
> >
> > void go_cairo_push_clip (GOCairo *gcairo, GOPath const *path);
> > void go_cairo_pop_clip (GOCairo *gcairo);
> >
> > void go_cairo_stroke (GOCairo *gcairo, GOPath const *path);
> > void go_cairo_fill (GOCairo *gcairo, GOPath const *path);
> > void go_cairo_draw_shape (GOCairo *gcairo, GOPath const *path);
> > void go_cairo_draw_markers (GOCairo *gcairo, GOPath const *path);
> > void go_cairo_draw_text (GOCairo *gcairo, double x, double y,
> > char
> > const *text, GtkAnchorType anchor);
> >
> > void go_cairo_get_text_OBR (GOCairo *gcairo, char const *text,
> > GOGeometryOBR *obr);
> > void go_cairo_get_text_AABR (GOCairo *gcairo, char const *text,
> > GOGeometryAABR *aabr);
> >
> > double go_cairo_line_size (GOCairo const *gcairo, double width);
> > double go_cairo_pt_2r_x (GOCairo const *gcairo, double d);
> > double go_cairo_pt_2r_y (GOCairo const *gcairo, double d);
> > double go_cairo_pt_2r (GOCairo const *gcairo, double d);
> >
> > void go_cairo_render (GOCairo *gcairo, cairo_surface_t *surface);
>
> All that might be included in the GOImage code I'm currently working on,
> IMHO. I hope I can have something operational as soon as tomorrow ;-)
All what ? All of what's above ?
> > The final step would be to port all existing plot plugins. I think I'll
> > move pixbuf caching to gog_control_foo_canvas, and image_export and
> > get_pixbuf to GogGraphView.
> >
> > Regarding printing, since there's no gnome-print backend for cairo, I
> > guess we can just render graphs as raster image.
>
> Please, don't do that! It would be a serious regression (unless you use
> high resolution. Let's use the gnome-print renderer as long as we use
> gnome-print (hopefully not too long).
We could use a high resolution. My concern is if we keep a part of
GogRenderer, for its gnome-print support, we'll have either a lot of
duplicated code in plot plugins, or a mess of #ifdefs...
Emmanuel.
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