composite-integer-translate-over.c

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

#include <math.h>
#include "cairo-test.h"
#include <stdio.h>

#define SIZE 100
#define OFFSET 5.5
#define SCALE 1.5
const char	png_filename[]	= "romedalen.png";

cairo_test_t test = {
    "composite-integer-translate-over",
    "Test simple compositing: integer-translation 32->32 OVER",
    SIZE, SIZE
};

static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
    cairo_surface_t *image;

    image = cairo_test_create_surface_from_png (png_filename);

    cairo_set_source_rgba (cr, 0, 0, 0, 1);
    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
    cairo_fill (cr);

    cairo_translate (cr, OFFSET, OFFSET);
    cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
    cairo_set_source_surface (cr, image, 0, 0);
    cairo_rectangle (cr, 0, 0, (SIZE-OFFSET), (SIZE-OFFSET));
    cairo_fill (cr);

    cairo_surface_destroy (image);

    return CAIRO_TEST_SUCCESS;
}

int
main (void)
{
    return cairo_test (&test, draw);
}