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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: */
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