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#include <stdlib.h>
#include <string.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>
#define WIDTH 100
#define HEIGHT 100
const char *text = "The quick brown fox jumped over the lazy dog!";
int num_iters = 100;
GMutex mutex;
static cairo_surface_t *
create_surface (void)
{
return cairo_image_surface_create (CAIRO_FORMAT_A8, WIDTH, HEIGHT);
}
static PangoLayout *
create_layout (cairo_t *cr)
{
PangoLayout *layout = pango_cairo_create_layout (cr);
pango_layout_set_text (layout, text, -1);
pango_layout_set_width (layout, WIDTH * PANGO_SCALE);
return layout;
}
static void
draw (cairo_t *cr, PangoLayout *layout, unsigned int i)
{
cairo_set_source_rgba (cr, 1, 1, 1, 1);
cairo_paint (cr);
cairo_set_source_rgba (cr, 1, 1, 1, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_identity_matrix (cr);
cairo_scale (cr, (100 + i) / 10., (100 + i) / 10.);
pango_cairo_update_layout (cr, layout);
pango_cairo_show_layout (cr, layout);
}
static gpointer
thread_func (gpointer data)
{
cairo_surface_t *surface = data;
PangoLayout *layout;
int i;
cairo_t *cr = cairo_create (surface);
layout = create_layout (cr);
g_mutex_lock (&mutex);
g_mutex_unlock (&mutex);
for (i = 0; i < num_iters; i++)
draw (cr, layout, i);
g_object_unref (layout);
cairo_destroy (cr);
return 0;
}
int
main (int argc, char **argv)
{
int num_threads = 100;
int i;
GPtrArray *threads = g_ptr_array_new ();
GPtrArray *surfaces = g_ptr_array_new ();
if (argc > 1)
num_threads = atoi (argv[1]);
if (argc > 2)
num_iters = atoi (argv[2]);
g_mutex_lock (&mutex);
for (i = 0; i < num_threads; i++)
{
cairo_surface_t *surface = create_surface ();
g_ptr_array_add (surfaces, surface);
g_ptr_array_add (threads,
g_thread_new (g_strdup_printf ("%d", i),
thread_func,
surface));
}
/* Let them loose! */
g_mutex_unlock (&mutex);
for (i = 0; i < num_threads; i++)
g_thread_join (g_ptr_array_index (threads, i));
g_ptr_array_free (threads, TRUE);
/* Now, draw a reference image and check results. */
{
cairo_surface_t *ref_surface = create_surface ();
cairo_t *cr = cairo_create (ref_surface);
PangoLayout *layout = create_layout (cr);
unsigned char *ref_data = cairo_image_surface_get_data (ref_surface);
unsigned int len = WIDTH * HEIGHT;
draw (cr, layout, num_iters - 1);
g_object_unref (layout);
cairo_destroy (cr);
/* cairo_surface_write_to_png (ref_surface, "test-pangocairo-threads-reference.png"); */
g_assert (WIDTH == cairo_format_stride_for_width (CAIRO_FORMAT_A8, WIDTH));
for (i = 0; i < num_threads; i++)
{
cairo_surface_t *surface = g_ptr_array_index (surfaces, i);
unsigned char *data = cairo_image_surface_get_data (surface);
if (memcmp (ref_data, data, len))
{
fprintf (stderr, "image for thread %d different from reference image.\n", i);
cairo_surface_write_to_png (ref_surface, "test-pangocairo-threads-reference.png");
cairo_surface_write_to_png (surface, "test-pangocairo-threads-failed.png");
return 1;
}
cairo_surface_destroy (surface);
}
cairo_surface_destroy (ref_surface);
}
g_ptr_array_free (surfaces, TRUE);
pango_cairo_font_map_set_default (NULL);
return 0;
}
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