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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Creates icons for display in native menu items on macOS.
+ */
+
+#include "MOZIconHelper.h"
+
+#include "imgIContainer.h"
+#include "nsCocoaUtils.h"
+
+@implementation MOZIconHelper
+
+// Returns an autoreleased empty NSImage.
++ (NSImage*)placeholderIconWithSize:(NSSize)aSize {
+ return [[[NSImage alloc] initWithSize:aSize] autorelease];
+}
+
+// Returns an autoreleased NSImage.
++ (NSImage*)iconImageFromImageContainer:(imgIContainer*)aImage
+ withSize:(NSSize)aSize
+ presContext:(const nsPresContext*)aPresContext
+ computedStyle:
+ (const mozilla::ComputedStyle*)aComputedStyle
+ scaleFactor:(CGFloat)aScaleFactor {
+ bool isEntirelyBlack = false;
+ NSImage* retainedImage = nil;
+ nsresult rv;
+ if (aScaleFactor != 0.0f) {
+ rv = nsCocoaUtils::CreateNSImageFromImageContainer(
+ aImage, imgIContainer::FRAME_CURRENT, aPresContext, aComputedStyle,
+ &retainedImage, aScaleFactor, &isEntirelyBlack);
+ } else {
+ rv = nsCocoaUtils::CreateDualRepresentationNSImageFromImageContainer(
+ aImage, imgIContainer::FRAME_CURRENT, aPresContext, aComputedStyle,
+ &retainedImage, &isEntirelyBlack);
+ }
+
+ NSImage* image = [retainedImage autorelease];
+
+ if (NS_FAILED(rv) || !image) {
+ return nil;
+ }
+
+ int32_t origWidth = 0, origHeight = 0;
+ aImage->GetWidth(&origWidth);
+ aImage->GetHeight(&origHeight);
+
+ // If all the color channels in the image are black, treat the image as a
+ // template. This will cause macOS to use the image's alpha channel as a mask
+ // and it will fill it with a color that looks good in the context that it's
+ // used in. For example, for regular menu items, the image will be black, but
+ // when the menu item is hovered (and its background is blue), it will be
+ // filled with white.
+ [image setTemplate:isEntirelyBlack];
+
+ [image setSize:aSize];
+
+ return image;
+}
+
+@end