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Fix crash if display resolution is not set (#7950)
On my wayland / gnome3 setup DisplayHeightMM() returns 0. This resulted in a misleading startup error suggesting to fix my font paths.
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@ -315,6 +315,11 @@ void FontEngine::initFont(unsigned int basesize, FontMode mode)
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}
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u32 size = std::floor(RenderingEngine::getDisplayDensity() *
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m_settings->getFloat("gui_scaling") * basesize);
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if (size == 0) {
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errorstream << "FontEngine: attempt to use font size 0" << std::endl;
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errorstream << " display density: " << RenderingEngine::getDisplayDensity() << std::endl;
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abort();
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}
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u32 font_shadow = 0;
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u32 font_shadow_alpha = 0;
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@ -624,20 +624,17 @@ static float calcDisplayDensity()
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if (x11display != NULL) {
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/* try x direct */
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float dpi_height = floor(
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DisplayHeight(x11display, 0) /
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(DisplayHeightMM(x11display, 0) *
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0.039370) +
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0.5);
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float dpi_width = floor(
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DisplayWidth(x11display, 0) /
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(DisplayWidthMM(x11display, 0) *
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0.039370) +
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0.5);
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int dh = DisplayHeight(x11display, 0);
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int dw = DisplayWidth(x11display, 0);
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int dh_mm = DisplayHeightMM(x11display, 0);
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int dw_mm = DisplayWidthMM(x11display, 0);
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XCloseDisplay(x11display);
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return std::max(dpi_height, dpi_width) / 96.0;
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if (dh_mm != 0 && dw_mm != 0) {
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float dpi_height = floor(dh / (dh_mm * 0.039370) + 0.5);
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float dpi_width = floor(dw / (dw_mm * 0.039370) + 0.5);
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return std::max(dpi_height, dpi_width) / 96.0;
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}
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}
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}
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