I don't know the format, size, etc. of the images that you are working with. There are a few things that can affect the time it takes to move image data around. GTK should be able to handle the problem well though.
Try setting up a test environment with a frame counter and a timer on your image transfer function and see how long it takes. Work from there to optimize the situation. You can use a Pixbuf or a cairo image surface if you need to deal with byte copies or pixel by pixel copies. It's worth a try.
https://developer.gnome.org/gdk-pixbuf/stable/gdk-pixbuf-The-GdkPixbuf-Structure.html
https://cairographics.org/manual/cairo-Image-Surfaces.html
Eric
/*
gcc -Wall cairo_image1.c -o cairo_image1 `pkg-config gtk+-3.0 --cflags --libs`
Tested on Ubuntu16.04 32-bit with GTK3.18.
*/
#include<gtk/gtk.h>
#include<stdint.h>
cairo_surface_t *surface=NULL;
static gboolean animate_drawing(GtkWidget *drawing, GdkFrameClock *frame_clock, gpointer data);
static gboolean da_drawing(GtkWidget *da, cairo_t *cr, gpointer data);
static void draw_image(cairo_t *cr);
int main(int argc, char *argv[])
{
gtk_init(&argc, &argv);
GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Cairo Image");
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
surface=cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 400, 400);
GtkWidget *da=gtk_drawing_area_new();
gtk_widget_set_hexpand(da, TRUE);
gtk_widget_set_vexpand(da, TRUE);
g_signal_connect(da, "draw", G_CALLBACK(da_drawing), NULL);
GtkWidget *grid=gtk_grid_new();
gtk_grid_attach(GTK_GRID(grid), da, 0, 0, 1, 1);
gtk_container_add(GTK_CONTAINER(window), grid);
gtk_widget_show_all(window);
gtk_widget_add_tick_callback(GTK_WIDGET(da), (GtkTickCallback)animate_drawing, NULL, NULL);
gtk_main();
cairo_surface_destroy(surface);
return 0;
}
static gboolean animate_drawing(GtkWidget *da, GdkFrameClock *frame_clock, gpointer data)
{
//Check frame rate.
gint64 frame=gdk_frame_clock_get_frame_counter(frame_clock);
gint64 current_time=gdk_frame_clock_get_frame_time(frame_clock);
gint64 start = gdk_frame_clock_get_history_start(frame_clock);
gint64 history_len=frame-start;
GdkFrameTimings *previous_timings=gdk_frame_clock_get_timings(frame_clock, frame-history_len);
gint64 previous_frame_time=gdk_frame_timings_get_frame_time(previous_timings);
g_print("Frame %i, %f fps\n", (gint)frame, (gdouble)(history_len)*G_USEC_PER_SEC/(gdouble)(current_time-previous_frame_time));
gtk_widget_queue_draw(da);
return G_SOURCE_CONTINUE;
}
static gboolean da_drawing(GtkWidget *da, cairo_t *cr, gpointer data)
{
//Get the draw time.
GTimer *timer=g_timer_new();
draw_image(cr);
g_print("Time %f\n", g_timer_elapsed(timer, NULL));
g_timer_destroy(timer);
return FALSE;
}
static void draw_image(cairo_t *cr)
{
static gint counter=0;
gint i=0;
gint j=0;
gint width=cairo_image_surface_get_width(surface);
gint height=cairo_image_surface_get_height(surface);
uint32_t *p1=(uint32_t*)cairo_image_surface_get_data(surface);
for(i=0;i<height;i++)
{
for(j=0;j<width;j++)
{
if(counter==i||counter==i+1) *p1=0xffff00ff;
else *p1=0xffffffff;
p1++;
}
}
cairo_surface_mark_dirty(surface);
cairo_set_source_surface(cr, surface, 0.0, 0.0);
cairo_paint(cr);
if(counter>height) counter=0;
else counter++;
}
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