diff options
| -rw-r--r-- | cairomm/context.cc | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/cairomm/context.cc b/cairomm/context.cc index c5d10ed..95d33e2 100644 --- a/cairomm/context.cc +++ b/cairomm/context.cc @@ -169,7 +169,9 @@ void Context::set_dash(std::valarray<double>& dashes, double offset) void Context::set_dash(std::vector<double>& dashes, double offset) { - cairo_set_dash(cobj(), &dashes[0], dashes.size(), offset); + cairo_set_dash(cobj(), + (dashes.empty() ? 0 : &dashes[0]), + dashes.size(), offset); check_object_status_and_throw_exception(*this); } @@ -184,7 +186,9 @@ void Context::set_dash(const std::valarray<double>& dashes, double offset) void Context::set_dash(const std::vector<double>& dashes, double offset) { - cairo_set_dash(cobj(), &dashes[0], dashes.size(), offset); + cairo_set_dash(cobj(), + (dashes.empty() ? 0 : &dashes[0]), + dashes.size(), offset); check_object_status_and_throw_exception(*this); } @@ -590,15 +594,19 @@ void Context::show_text_glyphs(const std::string& utf8, TextClusterFlags cluster_flags) { cairo_show_text_glyphs(cobj(), utf8.c_str(), utf8.size(), - &glyphs[0], glyphs.size(), - &clusters[0], clusters.size(), + (glyphs.empty() ? 0 : &glyphs[0]), + glyphs.size(), + (clusters.empty() ? 0 : &clusters[0]), + clusters.size(), static_cast<cairo_text_cluster_flags_t>(cluster_flags)); check_object_status_and_throw_exception(*this); } void Context::show_glyphs(const std::vector<Glyph>& glyphs) { - cairo_show_glyphs(cobj(), const_cast<cairo_glyph_t*>(&glyphs[0]), glyphs.size()); + cairo_show_glyphs(cobj(), + const_cast<cairo_glyph_t*>((glyphs.empty() ? 0 : &glyphs[0])), + glyphs.size()); check_object_status_and_throw_exception(*this); } @@ -637,7 +645,7 @@ void Context::get_text_extents(const std::string& utf8, TextExtents& extents) co void Context::get_glyph_extents(const std::vector<Glyph>& glyphs, TextExtents& extents) const { cairo_glyph_extents(const_cast<cobject*>(cobj()), - const_cast<cairo_glyph_t*>(&glyphs[0]), + const_cast<cairo_glyph_t*>(glyphs.empty() ? 0 : &glyphs[0]), glyphs.size(), &extents); check_object_status_and_throw_exception(*this); } @@ -650,7 +658,9 @@ void Context::text_path(const std::string& utf8) void Context::glyph_path(const std::vector<Glyph>& glyphs) { - cairo_glyph_path(cobj(), const_cast<cairo_glyph_t*>(&glyphs[0]), glyphs.size()); + cairo_glyph_path(cobj(), + const_cast<cairo_glyph_t*>(glyphs.empty() ? 0 : &glyphs[0]), + glyphs.size()); check_object_status_and_throw_exception(*this); } |