diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2012-02-04 13:16:02 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2012-02-05 00:07:17 +0000 |
| commit | 0552f44d2f37c73b8d88821423789ece84875100 (patch) | |
| tree | a734e43bc2582086a704b6b63c41778fbedda13d | |
| parent | c4a4ee2a4e9c1e5c38e6ee49fbda1ed954ed52f6 (diff) | |
Add a zoom effect to the spinner-demo
To demonstrate handling of very large images by zooming in.
| -rw-r--r-- | spinner-demo.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/spinner-demo.c b/spinner-demo.c index 1194751..3f2f5da 100644 --- a/spinner-demo.c +++ b/spinner-demo.c @@ -180,6 +180,9 @@ int main(int argc, char **argv) struct device *device; struct timeval start, last_tty, last_fps, now; int frames, n; + int frame = 0; + double factor = 1.0125; + double zoom = 0.75; int show_fps = 1; const char *version; @@ -228,11 +231,11 @@ int main(int argc, char **argv) cairo_t *cr; double delta; - if (source->height * device->width > source->width * device->height) delta = device->width / (double)source->width; else delta = device->height / (double)source->height; + delta *= zoom; cr = cairo_create (fb->surface); cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); @@ -248,6 +251,10 @@ int main(int argc, char **argv) cairo_identity_matrix(cr); cairo_paint(cr); + if (++frame % 512 == 0) + factor = 1./factor; + zoom *= factor; + gettimeofday(&now, NULL); if (show_fps) { if (last_fps.tv_sec) |