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[GTK3] Consider textview root node background in addition to text node for -moz-field

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This is necessary for GTK versions > 3.18 because windows no longer clear their backgrounds since https://git.gnome.org/browse/gtk+/commit/?id=580ea227a6bb19ad6c6d4766b3a36dbad24583f3 and Ambiance for 3.20 has a transparent background for the "text" window.
This commit is contained in:
trav90 2018-04-06 09:10:47 -05:00 • committed by Roy Tam
commit 5ba7568c8d
1 changed files with 28 additions and 2 deletions
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30
widget/gtk/nsLookAndFeel.cpp
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@ -62,6 +62,22 @@ nsLookAndFeel::~nsLookAndFeel()
}
#if MOZ_WIDGET_GTK != 2
// Modifies color |*aDest| as if a pattern of color |aSource| was painted with
// CAIRO_OPERATOR_OVER to a surface with color |*aDest|.
static void
ApplyColorOver(const GdkRGBA& aSource, GdkRGBA* aDest) {
gdouble sourceCoef = aSource.alpha;
gdouble destCoef = aDest->alpha * (1.0 - sourceCoef);
gdouble resultAlpha = sourceCoef + destCoef;
if (resultAlpha != 0.0) { // don't divide by zero
destCoef /= resultAlpha;
sourceCoef /= resultAlpha;
aDest->red = sourceCoef * aSource.red + destCoef * aDest->red;
aDest->green = sourceCoef * aSource.green + destCoef * aDest->green;
aDest->blue = sourceCoef * aSource.blue + destCoef * aDest->blue;
}
}
static void
GetLightAndDarkness(const GdkRGBA& aColor,
double* aLightness, double* aDarkness)
@ -1291,9 +1307,19 @@ nsLookAndFeel::Init()
}
#else
// Text colors
GdkRGBA bgColor;
// If the text window background is translucent, then the background of
// the textview root node is visible.
style = ClaimStyleContext(MOZ_GTK_TEXT_VIEW);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL,
&bgColor);
ReleaseStyleContext(style);
style = ClaimStyleContext(MOZ_GTK_TEXT_VIEW_TEXT);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
sMozFieldBackground = GDK_RGBA_TO_NS_RGBA(color);
gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL,
&color);
ApplyColorOver(color, &bgColor);
sMozFieldBackground = GDK_RGBA_TO_NS_RGBA(bgColor);
gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
sMozFieldText = GDK_RGBA_TO_NS_RGBA(color);