File cairo-do-not-override-explicitly-requested-gray... of Package cairo

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File cairo-do-not-override-explicitly-requested-grayscale-aa.patch of Package cairo (Revision 95f89342379f225ce294ee763cf133f8)

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From 4f4d89506f58a64b4829b1bb239bab9e46d63727 Mon Sep 17 00:00:00 2001
From: Jehan <jehan@girinstud.io>
Date: Tue, 19 Jan 2021 12:42:31 +0100
Subject: [PATCH] src: do not override explicitly requested grayscale
 antialiasing.

If CAIRO_ANTIALIAS_DEFAULT is selected and system is set to subpixel, it
is perfectly normal to switch to CAIRO_ANTIALIAS_SUBPIXEL.
But when the calling application specifically requested
CAIRO_ANTIALIAS_GRAY then Cairo should honor the request.

This is an issue we have had for years in GIMP, where text on images
would render differently depending on the system the file is opened on.
This is obviously not right as a graphics work should be system
independant and allow the creator to decide if one wants a text to have
grayscale or subpixel rendering (a settings which would stick when
sharing the work file). Cairo should not override this.
The CAIRO_ANTIALIAS_DEFAULT settings exists exactly for this (when we
want Cairo to choose for us, in a system-dependant way); other settings
are when we need system independance.

Thanks to Adam Fontenot for initial investigations and tests on this and
other contributors before this.
---
 src/cairo-ft-font.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
index d2221edec..1f5befec3 100644
--- a/src/cairo-ft-font.c
+++ b/src/cairo-ft-font.c
@@ -1945,8 +1945,7 @@ _cairo_ft_options_merge (cairo_ft_options_t *options,
     }
 
     if (other->base.antialias == CAIRO_ANTIALIAS_SUBPIXEL &&
-	(options->base.antialias == CAIRO_ANTIALIAS_DEFAULT ||
-	 options->base.antialias == CAIRO_ANTIALIAS_GRAY)) {
+	options->base.antialias == CAIRO_ANTIALIAS_DEFAULT) {
 	options->base.antialias = CAIRO_ANTIALIAS_SUBPIXEL;
 	options->base.subpixel_order = other->base.subpixel_order;
     }
-- 
2.33.1

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File cairo-do-not-override-explicitly-requested-grayscale-aa.patch of Package cairo (Revision 95f89342379f225ce294ee763cf133f8)

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