dwrite: Do not segfault when there are no typographic features to return.

Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com> Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dwrite: Do not segfault when there are no typographic features to return.
65f50337 · Giovanni Mascellani · Alexandre Julliard · eac1ca61 · 65f50337
Commit 65f50337 authored Mar 03, 2021 by Giovanni Mascellani Committed by Alexandre Julliard Mar 03, 2021
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shape.c dlls/dwrite/shape.c +6 -0

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--- a/dlls/dwrite/shape.c
+++ b/dlls/dwrite/shape.c
@@ -372,6 +372,12 @@ HRESULT shape_get_typographic_features(struct scriptshaping_context *context, co
    shape_get_script_lang_index(context, scripts, MS_GPOS_TAG, &script_index, &language_index);
    opentype_get_typographic_features(&context->cache->gpos, script_index, language_index, &t);

+    if (t.count == 0)
+    {
+        *actual_tagcount = 0;
+        return S_OK;
+    }
+
    /* Sort and remove duplicates. */
    qsort(t.tags, t.count, sizeof(*t.tags), tag_array_sorting_compare);