cairo recording surface leaves target surface empty

Martin Kalbfuß <[email protected]> Fri, 14 Oct 2011 01:11:34 +0200

Newsgroups	gmane.comp.lib.cairo
Message-ID	<1318547494.6955.4.camel@martin-K7VT4APro>

Hi folks,

I try to use the recording surface of cairo. But when I draw it onto
another surface, there's nothing.
What's wrong here? Im new to cairo. So it's going to be a stupid
mistake. :-P

Source and bitmap are appended.


Thanks,
Martin Kalbfuß

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cairo_test2.c (text/x-csrc, 994 B)

#include <stdlib.h>
#include <stdio.h>
#include <cairo/cairo.h>

int main(void)
{
	cairo_surface_t *record = cairo_recording_surface_create(CAIRO_CONTENT_COLOR, NULL);
	cairo_t *record_cr = cairo_create(record);

	cairo_set_source_rgb(record_cr, 1, 0, 0);
	cairo_rectangle(record_cr, 10, 10, 100, 100);
	cairo_fill(record_cr);

	cairo_set_source_rgb(record_cr, 0, 1, 0);
	cairo_rectangle(record_cr, 50, 50, 140, 140);
	cairo_fill(record_cr);

	double x0, y0, width, height;
	cairo_recording_surface_ink_extents(record, &x0, &y0, &width, &height);

	printf("x: %lf, y: %lf, w: %lf, h: %lf\n", x0, y0, width, height);

	cairo_surface_t *output = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
	cairo_t *cr = cairo_create(output);
	cairo_set_source_surface(cr, record, 0, 0);
	cairo_paint(cr);

	cairo_surface_write_to_png(output, "out.png");

	cairo_destroy(record_cr);
	cairo_destroy(cr);
	cairo_surface_destroy(record);
	cairo_surface_destroy(output);

	return EXIT_SUCCESS;
}

out.png (image/png, 222 B) - not displayed