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basic-tutorial-5: expose_cb() is now draw_cb() and gets a cairo_t directly

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Sebastian Dröge 2017-08-07 08:58:58 +03:00
parent fce81a19a8
commit bc810ef40f
1 changed files with 1 additions and 4 deletions
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5
markdown/tutorials/basic/toolkit-integration.md
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@ -676,16 +676,13 @@ we call it when the main window is closed, after stopping the pipeline
/* This function is called everytime the video window needs to be redrawn (due to damage/exposure, /* This function is called everytime the video window needs to be redrawn (due to damage/exposure,
* rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise, * rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise,
* we simply draw a black rectangle to avoid garbage showing up. */ * we simply draw a black rectangle to avoid garbage showing up. */
static gboolean expose_cb (GtkWidget *widget, GdkEventExpose *event, CustomData *data) { static gboolean draw_cb (GtkWidget *widget, cairo_t *cr, CustomData *data) {
if (data->state < GST_STATE_PAUSED) { if (data->state < GST_STATE_PAUSED) {
GtkAllocation allocation; GtkAllocation allocation;
GdkWindow *window = gtk_widget_get_window (widget);
cairo_t *cr;
/* Cairo is a 2D graphics library which we use here to clean the video window. /* Cairo is a 2D graphics library which we use here to clean the video window.
* It is used by GStreamer for other reasons, so it will always be available to us. */ * It is used by GStreamer for other reasons, so it will always be available to us. */
gtk_widget_get_allocation (widget, &allocation); gtk_widget_get_allocation (widget, &allocation);
cr = gdk_cairo_create (window);
cairo_set_source_rgb (cr, 0, 0, 0); cairo_set_source_rgb (cr, 0, 0, 0);
cairo_rectangle (cr, 0, 0, allocation.width, allocation.height); cairo_rectangle (cr, 0, 0, allocation.width, allocation.height);
cairo_fill (cr); cairo_fill (cr);