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diff --git a/vcl/skia/osx/bitmap.cxx b/vcl/skia/osx/bitmap.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * Some of this code is based on Skia source code, covered by the following
+ * license notice (see readlicense_oo for the full license):
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ */
+
+#include <skia/osx/bitmap.hxx>
+
+#include <vcl/bitmapex.hxx>
+#include <vcl/image.hxx>
+
+#include <skia/salbmp.hxx>
+#include <osx/saldata.hxx>
+
+#include <SkBitmap.h>
+#include <SkCanvas.h>
+
+using namespace SkiaHelper;
+
+namespace SkiaHelper
+{
+CGImageRef createCGImage(const Image& rImage)
+{
+ BitmapEx bitmapEx(rImage.GetBitmapEx());
+ Bitmap bitmap(bitmapEx.GetBitmap());
+
+ if (bitmap.IsEmpty() || !bitmap.ImplGetSalBitmap())
+ return nullptr;
+
+ assert(dynamic_cast<SkiaSalBitmap*>(bitmap.ImplGetSalBitmap().get()) != nullptr);
+ SkiaSalBitmap* skiaBitmap = static_cast<SkiaSalBitmap*>(bitmap.ImplGetSalBitmap().get());
+
+ SkBitmap targetBitmap;
+ if (!targetBitmap.tryAllocPixels(
+ SkImageInfo::Make(bitmap.GetSizePixel().getWidth(), bitmap.GetSizePixel().getHeight(),
+ kRGBA_8888_SkColorType, kPremul_SkAlphaType)))
+ return nullptr;
+ SkPaint paint;
+ paint.setBlendMode(SkBlendMode::kSrc); // set as is
+ SkMatrix matrix; // The image is needed upside-down.
+ matrix.preTranslate(0, targetBitmap.height());
+ matrix.setConcat(matrix, SkMatrix::Scale(1, -1));
+
+ if (!bitmapEx.IsAlpha())
+ {
+ SkCanvas canvas(targetBitmap);
+ canvas.concat(matrix);
+ canvas.drawImage(skiaBitmap->GetSkImage(), 0, 0, SkSamplingOptions(), &paint);
+ }
+ else
+ {
+ AlphaMask alpha(bitmapEx.GetAlpha());
+ Bitmap alphaBitmap(alpha.GetBitmap());
+ assert(dynamic_cast<SkiaSalBitmap*>(alphaBitmap.ImplGetSalBitmap().get()) != nullptr);
+ SkiaSalBitmap* skiaAlpha
+ = static_cast<SkiaSalBitmap*>(alphaBitmap.ImplGetSalBitmap().get());
+#if 0
+ // Drawing to a bitmap using a shader from a GPU-backed image fails silently.
+ // https://bugs.chromium.org/p/skia/issues/detail?id=12685
+ paint.setShader(SkShaders::Blend(SkBlendMode::kDstOut,
+ skiaBitmap->GetSkShader(SkSamplingOptions()),
+ skiaAlpha->GetAlphaSkShader(SkSamplingOptions())));
+#else
+ sk_sp<SkImage> imB = skiaBitmap->GetSkImage()->makeNonTextureImage();
+ sk_sp<SkImage> imA = skiaAlpha->GetAlphaSkImage()->makeNonTextureImage();
+ paint.setShader(SkShaders::Blend(SkBlendMode::kDstOut, imB->makeShader(SkSamplingOptions()),
+ imA->makeShader(SkSamplingOptions())));
+#endif
+ SkCanvas canvas(targetBitmap);
+ canvas.concat(matrix);
+ canvas.drawPaint(paint);
+ }
+
+ CGContextRef context = CGBitmapContextCreate(
+ targetBitmap.getAddr32(0, 0), targetBitmap.width(), targetBitmap.height(), 8,
+ targetBitmap.rowBytes(), GetSalData()->mxRGBSpace, kCGImageAlphaPremultipliedLast);
+ if (!context)
+ return nullptr;
+ CGImageRef screenImage = CGBitmapContextCreateImage(context);
+ CFRelease(context);
+ return screenImage;
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */