Commit 5f2ac56e authored by Benjamin Otte's avatar Benjamin Otte

docs: Replace pixmap use in migration guide with cairo surfaces

Merge my patch for this with Matthias' previous patch and keep the best
of both.
parent ff5d4e13
......@@ -217,6 +217,10 @@ gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
cairo_paint (cr);
cairo_destroy (cr);
Note that very similar code can be used when porting code
using GdkPixmap to #cairo_surface_t by calling
cairo_set_source_surface() instead of
......@@ -234,20 +238,21 @@ gdk_gc_set_tile (gc, pixmap);
gdk_gc_set_fill (gc, GDK_TILED);
gdk_gc_set_ts_origin (gc, x_origin, y_origin);
/* use */
gdk_draw_rectangle (drawable, gc, TRUE, 0, 0, width, height);
gdk_draw_rectangle (window, gc, TRUE, 0, 0, width, height);
/* restore */
gdk_gc_set_tile (gc, NULL);
gdk_gc_set_fill (gc, GDK_SOLID);
gdk_gc_set_ts_origin (gc, 0, 0);
The equivalent cairo code looks like this:
The equivalent cairo code to draw a tiled surfacelooks
like this:
cairo_t *cr;
cairo_surface_t *surface;
surface = ...
cr = gdk_cairo_create (window);
gdk_cairo_set_source_surface (cr, surface, x_origin, y_origin);
cairo_set_source_surface (cr, surface, x_origin, y_origin);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);
......@@ -356,14 +361,14 @@ gdk_draw_drawable (pixmap,
By using this code:
cairo_t *cr = gdk_cairo_create (window);
cairo_t *cr = cairo_create (surface);
/* clipping restricts the intermediate surface's size, so it's a good idea
* to use it. */
gdk_cairo_rectangle (cr, &amp;area);
cairo_clip (cr);
/* Now push a group to change the target */
cairo_push_group (cr);
gdk_cairo_set_source_surface (cr, surface, dx, dy);
cairo_set_source_surface (cr, surface, dx, dy);
cairo_paint (cr);
/* Now copy the intermediate target back */
cairo_pop_group_to_source (cr);
......@@ -769,8 +774,8 @@ on_alpha_screen_changed (GtkWindow *window,
#GdkDrawable has been removed in GTK+ 3, together with #GdkPixmap
and #GdkImage. The only remaining drawable class is #GdkWindow.
For dealing with image data, you should use cairo surfaces or
For dealing with image data, you should use a #cairo_surface_t or
a #GdkPixbuf.
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