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Print on Linux: use 600 DPI instead of the default 72 DPI (noticeable in Pcbnew)

This commit is contained in:
jean-pierre charras 2019-03-17 17:21:13 +01:00
parent af0cb68c1b
commit bd693f97a1
1 changed files with 10 additions and 3 deletions
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13
common/gal/cairo/cairo_print.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2018 CERN
* Copyright (C) 2019 CERN
* Author: Maciej Suminski <maciej.suminski@cern.ch>
* Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
@ -63,8 +63,14 @@ CAIRO_PRINT_CTX::CAIRO_PRINT_CTX( wxDC* aDC )
#ifdef __WXGTK__
m_ctx = static_cast<cairo_t*>( gctx->GetNativeContext() );
m_surface = cairo_get_target( m_ctx );
// Magic value: apparently for linux, all printers are 72 DPI
m_dpi = 72.0;
// On linux, cairo printers are 72 DPI by default. This is an ususable resolution for us.
// A reasonable resolution is 600 DPI
// so modify the default:
#define DEFAULT_DPI 72.0
#define KICAD_PRINTER_DPI 600.0
// our device scale is DEFAULT_DPI / KICAD_PRINTER_DPI
cairo_surface_set_device_scale( m_surface, DEFAULT_DPI/KICAD_PRINTER_DPI, DEFAULT_DPI/KICAD_PRINTER_DPI );
m_dpi = KICAD_PRINTER_DPI;
#endif /* __WXGTK__ */
#ifdef __WXMSW__
@ -122,6 +128,7 @@ CAIRO_PRINT_GAL::CAIRO_PRINT_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions,
m_clearColor = COLOR4D( 1.0, 1.0, 1.0, 1.0 );
m_hasNativeLandscapeRotation = false;
resetContext();
SetScreenDPI( m_printCtx->GetNativeDPI() );
}