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-rw-r--r--widget/gtk/nsLookAndFeel.cpp30
1 files changed, 28 insertions, 2 deletions
diff --git a/widget/gtk/nsLookAndFeel.cpp b/widget/gtk/nsLookAndFeel.cpp
index abc0ff061..22d0099ef 100644
--- a/widget/gtk/nsLookAndFeel.cpp
+++ b/widget/gtk/nsLookAndFeel.cpp
@@ -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);