Attachment 136439 Details for Bug 104410 – minimal example reproducing the issue.

minimal example reproducing the issue.

main.c (text/x-csrc), 2.59 KB, created by Antony Lee on 2017-12-28 23:37:49 UTC

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Creator: Antony Lee

Created: 2017-12-28 23:37:49 UTC

Size: 2.59 KB

patch

obsolete

>// Compile with
>// $ gcc main.c -g $(pkg-config --cflags cairo) $(pkg-config --libs cairo) -DFOO -o main
>// where FOO is one of DIRECT_SCRIPT, DELAYED_SCRIPT, DELAYED_SVG.
>//
>// Run with
>// $ ./main | cut -c-80
>//
>// Observed that for DELAYED_SCRIPT (but not DELAYED_SVG), the end of the
>// script ("/s4 undef") is written to the file (stdout, in this case) *after*
>// the resources should have been freed.
>#include <stddef.h>
>#include <stdio.h>
>#include <cairo/cairo.h>
>#include <cairo/cairo-script.h>
>#include <cairo/cairo-svg.h>
>
>void main() {
>  cairo_surface_t* rec_surf = cairo_recording_surface_create(
>      CAIRO_CONTENT_ALPHA, NULL);
>  cairo_t* rec_ctx = cairo_create(rec_surf);
>  cairo_surface_destroy(rec_surf);
>
>#ifdef DIRECT_SCRIPT
>  cairo_device_t* script = cairo_script_create("/dev/stdout");
>  cairo_surface_t* script_surf =
>    cairo_script_surface_create(script, CAIRO_CONTENT_COLOR_ALPHA, 100, 100);
>  cairo_device_destroy(script);
>  cairo_t* script_ctx = cairo_create(script_surf);
>#else
>  cairo_t* script_ctx = NULL;
>#endif
>
>  // Make sure that the recording surface is destroyed last.
>  cairo_t* ctxs[4] = {rec_ctx, script_ctx, NULL, NULL};
>
>  for (int i = 0; i < sizeof(ctxs) / sizeof(ctxs[0]); ++i) {
>    cairo_t* ctx = ctxs[i];
>    if (!ctx) { continue; }
>    cairo_move_to(ctx, 30, 30);
>    cairo_show_text(ctx, "hello world");
>  }
>
>#ifdef DELAYED_SCRIPT
>  // Transfer recording surface to script.
>  cairo_device_t* script1 = cairo_script_create("/dev/stdout");
>  cairo_surface_t* script1_surf =
>    cairo_script_surface_create(script1, CAIRO_CONTENT_COLOR_ALPHA, 100, 100);
>  cairo_device_destroy(script1);
>  cairo_t* script1_ctx = cairo_create(script1_surf); ctxs[2] = script1_ctx;
>  cairo_set_source_surface(script1_ctx, rec_surf, 0, 0);
>  cairo_paint(script1_ctx);
>#endif
>
>#ifdef DELAYED_SVG
>  // Transfer recording surface to SVG.
>  cairo_surface_t* svg1_surf = cairo_svg_surface_create("/dev/stdout", 100, 100);
>  cairo_t* svg1_ctx = cairo_create(svg1_surf); ctxs[3] = svg1_ctx;
>  cairo_surface_destroy(svg1_surf);
>  cairo_set_source_surface(svg1_ctx, rec_surf, 0, 0);
>  cairo_paint(svg1_ctx);
>#endif
>
>  // Done.
>  for (int i = sizeof(ctxs) / sizeof(ctxs[0]) - 1; i >= 0; --i) {
>    cairo_t* ctx = ctxs[i];
>    if (!ctx) { continue; }
>    // Free up resources in any possible way.
>    cairo_surface_t* surf = cairo_get_target(ctx);
>    cairo_device_t* dev = cairo_surface_get_device(surf);
>    if (dev) {
>      cairo_device_flush(dev);
>      cairo_device_finish(dev);
>    }
>    cairo_surface_flush(surf);
>    cairo_surface_finish(surf);
>    cairo_destroy(ctxs[i]);
>    printf("DESTROYED %i\n", i); fflush(stdout);
>  }
>}

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