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[Quartz] Hardcode screen resolution for text at 96.0.

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It seems that CoreText is internally calibrated for this, see
https://bugzilla.gnome.org/show_bug.cgi?id=787867 for a detailed
discussion.
This commit is contained in:
John Ralls 2018-04-30 20:34:45 -07:00
parent 85fa6ba631
commit 828f634d5c
1 changed files with 11 additions and 7 deletions
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18
gdk/quartz/gdkscreen-quartz.c
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@ -67,7 +67,7 @@ static void gdk_quartz_screen_calculate_layout (GdkQuartzScreen *screen);
static void display_reconfiguration_callback (CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void *userInfo);
static const double dpi = 96.0;
static gint get_mm_from_pixels (NSScreen *screen, int pixels);
G_DEFINE_TYPE (GdkQuartzScreen, gdk_quartz_screen, GDK_TYPE_SCREEN);
@ -76,10 +76,17 @@ static void
gdk_quartz_screen_init (GdkQuartzScreen *quartz_screen)
{
GdkScreen *screen = GDK_SCREEN (quartz_screen);
NSDictionary *dd = [[[NSScreen screens] objectAtIndex:0] deviceDescription];
NSSize size = [[dd valueForKey:NSDeviceResolution] sizeValue];
/* Screen resolution is used exclusively to pass to Pango for font
* scaling. There's a long discussion in
* https://bugzilla.gnome.org/show_bug.cgi?id=787867 exploring how
* screen resolution and pangocairo-coretext interact. The summary
* is that MacOS takes care of scaling fonts for Retina screens and
* that while the Apple Documentation goes on about "points" they're
* CSS points (96/in), not typeography points (72/in) and
* pangocairo-coretext needs to default to that scaling factor.
*/
_gdk_screen_set_resolution (screen, size.width);
_gdk_screen_set_resolution (screen, dpi);
gdk_quartz_screen_calculate_layout (quartz_screen);
@ -335,9 +342,6 @@ static gint
get_mm_from_pixels (NSScreen *screen, int pixels)
{
const float mm_per_inch = 25.4;
NSDictionary *dd = [[[NSScreen screens] objectAtIndex:0] deviceDescription];
NSSize size = [[dd valueForKey:NSDeviceResolution] sizeValue];
float dpi = size.width;
return (pixels / dpi) * mm_per_inch;
}