Attachment 136417 Details for Bug 104042 – minimal example reproducing the issue.

minimal example reproducing the issue.

main.c (text/x-csrc), 3.06 KB, created by Antony Lee on 2017-12-28 02:50:31 UTC

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Creator: Antony Lee

Created: 2017-12-28 02:50:31 UTC

Size: 3.06 KB

patch

obsolete

>// Compile and run with
>//   $ gcc main.c -g $(pkg-config --cflags cairo-ft) $(pkg-config --libs cairo-ft) -o main
>//   $ ./main
>// Inspect the contents of /tmp/test.png, /tmp/test1.png, /tmp/test.svg,
>// /tmp/test1.svg.  Only the last one is missing text (this is the
>// bug). cairo-script output is also generated (for reference) to
>// /tmp/test{,1}.script.
>
>// The program writes "hello world" to an image, an SVG and a script surface,
>// either directly, or via a recording surface used as pattern.
>
>// My investigations indicate that for the issue to appear, it is necessary
>// that
>// 1. the recording surface is unbounded, and
>// 2. the recording surface has content type CAIRO_CONTENT_ALPHA.
>
>#include <stddef.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);
>
>  cairo_surface_t* img_surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 100, 100);
>  cairo_t* img_ctx = cairo_create(img_surf);
>  cairo_surface_destroy(img_surf);
>
>  cairo_surface_t* svg_surf = cairo_svg_surface_create("/tmp/test.svg", 100, 100);
>  cairo_t* svg_ctx = cairo_create(svg_surf);
>  cairo_surface_destroy(svg_surf);
>
>  // Make sure that the recording surface is destroyed last.
>  cairo_t* ctxs[6] = {rec_ctx, img_ctx, svg_ctx, NULL, NULL, NULL};
>
>  for (int i = 0; i < 6; ++i) {
>    cairo_t* ctx = ctxs[i];
>    if (!ctx) { continue; }
>    cairo_move_to(ctx, 30, 30);
>    cairo_show_text(ctx, "hello world");
>  }
>
>  // Dump image to png.
>  cairo_surface_write_to_png(img_surf, "/tmp/test.png");
>
>  // Dump script.
>  cairo_device_t* script = cairo_script_create("/tmp/test.script");
>  cairo_script_from_recording_surface(script, cairo_get_target(rec_ctx));
>  cairo_device_destroy(script);
>
>  // Transfer recording surface to script.
>  cairo_device_t* script1 = cairo_script_create("/tmp/test1.script");
>  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[3] = script1_ctx;
>  cairo_set_source_surface(script1_ctx, rec_surf, 0, 0);
>  cairo_paint(script1_ctx);
>
>  // Transfer recording surface to PNG.
>  cairo_surface_t* img1_surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 100, 100);
>  cairo_t* img1_ctx = cairo_create(img1_surf); ctxs[4] = img1_ctx;
>  cairo_surface_destroy(img1_surf);
>  cairo_set_source_surface(img1_ctx, rec_surf, 0, 0);
>  cairo_paint(img1_ctx);
>  cairo_surface_write_to_png(img1_surf, "/tmp/test1.png");
>
>  // Transfer recording surface to SVG.
>  cairo_surface_t* svg1_surf = cairo_svg_surface_create("/tmp/test1.svg", 100, 100);
>  cairo_t* svg1_ctx = cairo_create(svg1_surf); ctxs[5] = svg1_ctx;
>  cairo_surface_destroy(svg1_surf);
>  cairo_set_source_surface(svg1_ctx, rec_surf, 0, 0);
>  cairo_paint(svg1_ctx);
>
>  // Done.
>  for (int i = 5; i >= 0; --i) {
>    cairo_surface_finish(cairo_get_target(ctxs[i]));
>    cairo_destroy(ctxs[i]);
>  }
>}

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Attachments on bug 104042: 135887 | 136417

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