Attachment 2922 Details for Bug 2694 – Source code illustrating one case of FPE in cairo.

Source code illustrating one case of FPE in cairo.

bug.c (text/plain), 1.04 KB, created by ellson on 2005-08-18 19:40:15 UTC

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Creator: ellson

Created: 2005-08-18 19:40:15 UTC

Size: 1.04 KB

patch

obsolete

>#define _GNU_SOURCE
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <fenv.h>
>#include <cairo.h>
>
>int A[] = {
>//    73, 66,
>//    58, 57,
>//    36, 44,
>    18, 32,
>    16, 30,
>    14, 29,
>    12, 27,
>};
>int nA = sizeof(A)/sizeof(int);
>
>double Z = 1.1;
>
>static cairo_status_t
>writer (void *closure, const unsigned char *data, unsigned int length)
>{
>    if (length == fwrite(data, 1, length, (FILE *)closure))
>	return CAIRO_STATUS_SUCCESS;
>    return CAIRO_STATUS_WRITE_ERROR;
>}
>
>int main(int argc, char *argv[])
>{
>    int i;
>    cairo_t *cr;
>    cairo_surface_t *surface;
>    
>    feenableexcept(FE_INVALID);
>
>    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 100, 100);
>    cr = cairo_create(surface);
>    cairo_surface_destroy (surface);
>
>    cairo_move_to(cr, A[0] * Z, A[1] * Z);
>    for (i = 2; i < nA; i += 6)
>	cairo_curve_to(cr,
>			A[i]   * Z, A[i+1] * Z,
>			A[i+2] * Z, A[i+3] * Z,
>			A[i+4] * Z, A[i+5] * Z);
>    cairo_stroke(cr);
>
>    cairo_surface_write_to_png_stream(surface, writer, stdout);
>    cairo_destroy(cr);
>    
>    return 0;
>}

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