Re: goffice and cairo
- From: Jean Bréfort <jean brefort normalesup org>
- To: Emmanuel Pacaud <emmanuel pacaud univ-poitiers fr>
- Cc: gnumeric-list gnome org
- Subject: Re: goffice and cairo
- Date: Tue, 23 May 2006 11:21:44 +0200
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 ;-)
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).
Cheers,
Jean
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