create-from-png-stream.c [plain text]
#include "cairo-test.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#define WIDTH 2
#define HEIGHT 2
static cairo_status_t
read_png_from_file (void *closure, unsigned char *data, unsigned int length)
{
FILE *file = closure;
size_t bytes_read;
bytes_read = fread (data, 1, length, file);
if (bytes_read != length)
return CAIRO_STATUS_READ_ERROR;
return CAIRO_STATUS_SUCCESS;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
char *filename;
FILE *file;
cairo_surface_t *surface;
cairo_status_t status;
xasprintf (&filename, "%s/%s", ctx->srcdir,
"create-from-png-stream.ref.png");
file = fopen (filename, "rb");
if (file == NULL) {
cairo_test_status_t ret;
ret = CAIRO_TEST_FAILURE;
if (errno == ENOMEM)
ret = cairo_test_status_from_status (ctx, CAIRO_STATUS_NO_MEMORY);
if (ret != CAIRO_TEST_NO_MEMORY)
cairo_test_log (ctx, "Error: failed to open file: %s\n", filename);
free (filename);
return ret;
}
surface = cairo_image_surface_create_from_png_stream (read_png_from_file,
file);
fclose (file);
status = cairo_surface_status (surface);
if (status) {
cairo_test_status_t ret;
cairo_surface_destroy (surface);
ret = cairo_test_status_from_status (ctx, status);
if (ret != CAIRO_TEST_NO_MEMORY) {
cairo_test_log (ctx,
"Error: failed to create surface from PNG: %s - %s\n",
filename,
cairo_status_to_string (status));
}
free (filename);
return ret;
}
free (filename);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
cairo_paint (cr);
cairo_surface_destroy (surface);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (create_from_png_stream,
"Tests the creation of an image surface from a PNG using a FILE *",
"png",
NULL,
WIDTH, HEIGHT,
NULL, draw)