diff options
Diffstat (limited to 'vcl/unx/generic/gdi/cairotextrender.cxx')
| -rw-r--r-- | vcl/unx/generic/gdi/cairotextrender.cxx | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/vcl/unx/generic/gdi/cairotextrender.cxx b/vcl/unx/generic/gdi/cairotextrender.cxx index d6355e65f173..aa006fa7c5d3 100644 --- a/vcl/unx/generic/gdi/cairotextrender.cxx +++ b/vcl/unx/generic/gdi/cairotextrender.cxx @@ -204,6 +204,22 @@ void CairoTextRender::DrawTextLayout(const GenericSalLayout& rLayout, const SalG if (nWidth == 0 || nHeight == 0) return; + int nRatio = nWidth * 10 / nHeight; + if (nRatio > 100 && rFSD.maTargetName == "OpenSymbol" && FreetypeFont::AlmostHorizontalDrainsRenderingPool()) + { + // tdf#127189 FreeType <= 2.8 will fail to render stretched horizontal + // brace glyphs in starmath at a fairly low stretch ratio. The failure + // will set CAIRO_STATUS_FREETYPE_ERROR on the surface which cannot be + // cleared, so all further painting to the surface fails. + + // This appears fixed in >= freetype 2.9 + + // Restrict this bodge to a stretch ratio > ~10 of the OpenSymbol font + // where it has been seen in practice. + SAL_WARN("vcl", "rendering text would fail with stretch ratio of: " << nRatio << ", with FreeType <= 2.8"); + return; + } + /* * It might be ideal to cache surface and cairo context between calls and * only destroy it when the drawable changes, but to do that we need to at @@ -330,6 +346,10 @@ void CairoTextRender::DrawTextLayout(const GenericSalLayout& rLayout, const SalG cairo_set_font_matrix(cr, &m); cairo_show_glyphs(cr, &cairo_glyphs[nStartIndex], nLen); + if (cairo_status(cr) != CAIRO_STATUS_SUCCESS) + { + SAL_WARN("vcl", "rendering text failed with stretch ratio of: " << nRatio << ", " << cairo_status_to_string(cairo_status(cr))); + } #if OSL_DEBUG_LEVEL > 2 //draw origin |