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desktop-shell: allow to center background image

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Add the centered option as background-type. This draws the image
once in the center of the screen. If the image is larger, it will
be cropped like scale-crop.

Signed-off-by: Stefan Agner <stefan@agner.ch>
This commit is contained in:
Stefan Agner
2018-08-22 23:56:07 +02:00
committed by Daniel Stone
parent 1c1e4fdaf4
commit 20b241691b
2 changed files with 22 additions and 3 deletions
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clients/desktop-shell.c
+18 -2
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@@ -736,7 +736,8 @@ panel_add_launcher(struct panel *panel, const char *icon, const char *path)
enum {
BACKGROUND_SCALE,
BACKGROUND_SCALE_CROP,
BACKGROUND_TILE
BACKGROUND_TILE,
BACKGROUND_CENTERED
};
static void
@@ -800,14 +801,27 @@ background_draw(struct widget *widget, void *data)
case BACKGROUND_TILE:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
break;
case BACKGROUND_CENTERED:
s = (sx < sy) ? sx : sy;
if (s < 1.0)
s = 1.0;
/* align center */
tx = (im_w - s * allocation.width) * 0.5;
ty = (im_h - s * allocation.height) * 0.5;
cairo_matrix_init_translate(&matrix, tx, ty);
cairo_matrix_scale(&matrix, s, s);
cairo_pattern_set_matrix(pattern, &matrix);
break;
}
cairo_set_source(cr, pattern);
cairo_pattern_destroy (pattern);
cairo_surface_destroy(image);
cairo_mask(cr, pattern);
}
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
@@ -1143,6 +1157,8 @@ background_create(struct desktop *desktop, struct output *output)
background->type = BACKGROUND_SCALE_CROP;
} else if (strcmp(type, "tile") == 0) {
background->type = BACKGROUND_TILE;
} else if (strcmp(type, "centered") == 0) {
background->type = BACKGROUND_CENTERED;
} else {
background->type = -1;
fprintf(stderr, "invalid background-type: %s\n",