/* Create a new backing pixmap of the appropriate size */
static gint graph_configure_event(GtkWidget *widget, GdkEventConfigure *event,
gpointer data) {
graph_priv_t *priv = g_object_get_data(G_OBJECT(data), "priv");
g_assert(priv);
if(priv->pixmap) {
int width, height;
gdk_drawable_get_size(priv->pixmap, &width, &height);
if((width != widget->allocation.width) ||
(height != widget->allocation.height)) {
gdk_pixmap_unref(priv->pixmap);
priv->pixmap = NULL;
}
}
if(!priv->pixmap) {
priv->pixmap = gdk_pixmap_new(widget->window,
widget->allocation.width,
widget->allocation.height,
-1);
graph_draw(GTK_WIDGET(data));
}
return TRUE;
}
int main(int argc, char **argv)
{
int width, height;
double colour[3];
struct wav_file *wav;
float samples[CHUNK_SIZE];
int sample_count;
struct graph *gr;
cairo_surface_t *surface;
/* Validate and parse command-line arguments */
if(parse_arguments(argc, argv, &width, &height, colour) != 0)
return 1;
/* Open input file */
if( !(wav = wav_open(argv[1])))
{
fprintf(stderr, "Unable to open input audio file %s\n", argv[1]);
return 1;
}
/* Buffer all samples from input file. */
gr = graph_init();
while((sample_count = wav_read_samples(wav, samples, CHUNK_SIZE)) > 0)
graph_buffer_samples(gr, samples, sample_count);
/* Close input file */
wav_close(wav);
/* Draw graph and output to PNG file using Cairo */
surface = graph_draw(gr, width, height, colour);
if(cairo_surface_write_to_png(surface, argv[2]) != CAIRO_STATUS_SUCCESS)
{
fprintf(stderr, "Error writing graph to PNG file\n");
return 1;
}
graph_surface_destroy(surface);
graph_destroy(gr);
return 0;
}
/* We double buffer the image. It looks nice and it enables
* grabbing the graph with the pointer and translating it.
* We draw on our own larger surface and then copy part of that
* to the gdk surface.
*
* We assume that this function is drawing to an exposed/showing
* drawing area, so the status update will reflect the current
* exposed/showing drawing area. */
void qp_graph_draw(struct qp_graph *gr, cairo_t *gdk_cr)
{
GtkAllocation allocation;
if(gr->waiting_to_resize_draw && !gr->qp->shape)
{
//WARN("gr=%p gr->name=\"%s\" gr->ref_count=%d\n", gr, gr->name, gr->ref_count);
cairo_set_source_rgba(gdk_cr, gr->background_color.r,
gr->background_color.g, gr->background_color.b,
gr->background_color.a);
cairo_paint(gdk_cr);
g_idle_add_full(G_PRIORITY_LOW, idle_callback, gr, NULL);
/* fight qp_graph_destroy() race condition with flag */
++gr->ref_count;
/* We draw after the other widgets are drawn, in case drawing
* takes a long time. This waiting also gives a chance
* for the watch cursor to show. But that seems to only
* show if the window had focus at the right time. */
return;
}
gtk_widget_get_allocation(gr->drawing_area, &allocation);
if(gr->pixbuf_needs_draw)
{
cairo_t *db_cr; /* double buffer cr */
db_cr = cairo_create(gr->pixbuf_surface);
graph_draw(gr, db_cr, gr->pixbuf_x, gr->pixbuf_y,
gr->pixbuf_width, gr->pixbuf_height);
cairo_destroy(db_cr);
// debuging
//cairo_surface_write_to_png(gr->pixbuf_surface, "x.png");
qp_win_set_status(gr->qp);
}
/* the GTK cairo_t *gdk_cr has no alpha bits so all the
* alpha drawn to it will be smushed. */
//WARN("content=0x%lx\n", (unsigned long)cairo_get_target(gdk_cr));
if(!gr->qp->shape)
{
/* Not using the shape X11 extension */
/* This is where we go from the back buffer to the drawing area */
draw_from_pixbuf(gdk_cr, gr, allocation.width, allocation.height);
if(gr->draw_zoom_box == 1)
draw_zoom_box(gdk_cr, gr);
if(gr->draw_value_pick)
draw_value_pick_line(gdk_cr, gr, allocation.width, allocation.height);
if(gr->pixbuf_needs_draw)
{
gdk_window_set_cursor(gtk_widget_get_window(gr->qp->window), NULL);
gr->pixbuf_needs_draw = 0;
// gr->qp->wait_warning_showing = 0;
}
}
else
{
/* Use the X11 shape extension */
/* TODO: This is a resource pig. Fix it. */
cairo_region_t *reg_draw_area, *window_region;
/* empty flag */
int empty;
cairo_surface_t *mask_surface;
GtkAllocation all;
/* Make sure the surface is up to date */
//cairo_surface_flush(gr->pixbuf_surface);
/* make a sub surface that is the size of the graph drawing area */
mask_surface = cairo_surface_create_for_rectangle(gr->pixbuf_surface,
INT(gr->pixbuf_x+gr->grab_x),
INT(gr->pixbuf_y+gr->grab_y),
allocation.width, allocation.height);
reg_draw_area = get_cairo_region_create_from_surface(gr,
mask_surface, allocation.width, allocation.height);
cairo_surface_destroy(mask_surface);
cairo_region_translate(reg_draw_area, allocation.x, allocation.y);
gtk_widget_get_allocation(gr->qp->window, &all);
all.x = all.y = 0;
window_region = cairo_region_create_rectangle(&all);
cairo_region_subtract_rectangle(window_region, &allocation);
empty = cairo_region_is_empty(reg_draw_area);
if(!empty)
cairo_region_union(window_region, reg_draw_area);
cairo_region_destroy(reg_draw_area);
/* window_region is a region with a hole in it the
* size of the drawing area with the graph and grid added back. */
if(gr->draw_zoom_box && !empty)
{
cairo_rectangle_int_t rec;
rec.x = allocation.x + gr->z_x;
rec.y = allocation.y + gr->z_y;
rec.width = gr->z_w;
rec.height = gr->z_h;
/* regions do not like negitive values or
* maybe shapes do not like negitive values
* in any case we keep width and height
* positive */
if(rec.width < 0)
{
rec.width *= -1;
rec.x -= rec.width;
}
if(rec.height < 0)
{
rec.height *= -1;
rec.y -= rec.height;
}
cairo_region_union_rectangle(window_region, &rec);
/* now we have the zoom box added to window_region */
}
/* This is where we go from the back buffer to the drawing area */
draw_from_pixbuf(gdk_cr, gr, allocation.width, allocation.height);
if(gr->draw_zoom_box)
draw_zoom_box(gdk_cr, gr);
if(gr->draw_value_pick)
draw_value_pick_line(gdk_cr, gr, allocation.width, allocation.height);
if(empty)
{
/* we have nothing to make a shape with */
if(gr->qp->last_shape_region)
{
cairo_region_destroy(gr->qp->last_shape_region);
gr->qp->last_shape_region = NULL;
}
cairo_region_destroy(window_region);
/* remove the old shape region */
gtk_widget_shape_combine_region(gr->qp->window, NULL);
}
else if(!gr->qp->last_shape_region ||
!cairo_region_equal(gr->qp->last_shape_region, window_region))
{
// DEBUG("creating new shape region\n");
/* We need to undo the old shape first */
gtk_widget_shape_combine_region(gr->qp->window, NULL);
gtk_widget_shape_combine_region(gr->qp->window, window_region);
if(gr->qp->last_shape_region)
cairo_region_destroy(gr->qp->last_shape_region);
gr->qp->last_shape_region = window_region;
}
else
cairo_region_destroy(window_region);
gr->pixbuf_needs_draw = 0;
gdk_window_set_cursor(gtk_widget_get_window(gr->qp->window), NULL);
// debuging
//cairo_surface_write_to_png(cairo_get_target(gdk_cr), "y.png");
}
if(gr->qp->update_graph_detail && gr->qp->graph_detail)
{
gr->qp->update_graph_detail = 0;
/* make the graph configure window show stuff about this graph */
qp_win_graph_detail_init(gr->qp);
}
}
int
graph_redraw (graph_t *graph, void *context)
{
return graph_draw(graph, context);
}
