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GTK: use cairo_paint() to copy from backing store to screen

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I just found cairo_paint() while wandering the Cairo documentation.  It
just fills the entire clip region with data from the current source,
which is precisely what draw_area() wants to do.  This is simpler for us
than requesting the bounding rectangle of the clipping region and then
filling it, and as far as I can tell the clipping rectangle generally
covers the whole window anyway.
This commit is contained in:
Ben Harris 2025-04-10 10:09:07 +01:00
parent 01043ce4fc
commit c93a225b97
1 changed files with 1 additions and 6 deletions
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7
unix/window.c
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@ -953,7 +953,6 @@ static gint draw_area(GtkWidget *widget, cairo_t *cr, gpointer data)
* inst->surface to the window. * inst->surface to the window.
*/ */
if (inst->surface) { if (inst->surface) {
GdkRectangle dirtyrect;
cairo_surface_t *target_surface; cairo_surface_t *target_surface;
double orig_sx, orig_sy; double orig_sx, orig_sy;
cairo_matrix_t m; cairo_matrix_t m;
@ -982,12 +981,8 @@ static gint draw_area(GtkWidget *widget, cairo_t *cr, gpointer data)
cairo_surface_set_device_scale(target_surface, 1.0, 1.0); cairo_surface_set_device_scale(target_surface, 1.0, 1.0);
cairo_translate(cr, m.x0 * (orig_sx - 1.0), m.y0 * (orig_sy - 1.0)); cairo_translate(cr, m.x0 * (orig_sx - 1.0), m.y0 * (orig_sy - 1.0));
gdk_cairo_get_clip_rectangle(cr, &dirtyrect);
cairo_set_source_surface(cr, inst->surface, 0, 0); cairo_set_source_surface(cr, inst->surface, 0, 0);
cairo_rectangle(cr, dirtyrect.x, dirtyrect.y, cairo_paint(cr);
dirtyrect.width, dirtyrect.height);
cairo_fill(cr);
cairo_surface_set_device_scale(target_surface, orig_sx, orig_sy); cairo_surface_set_device_scale(target_surface, orig_sx, orig_sy);
} }