Add native Darwin handler for the HEIF (.heic) format

Adds basic support for still images encoded with the HEIF standard
introduced in macOS Sierra and IOS 11.

Uses the Core Graphics Image I/O Framework as codec backend.
Reuses the helper class from the macjp2 handler.

Change-Id: I5f0c7891b189a916cccd2c27eacbac12416ce209
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 187 insertions, 0 deletions

diff --git a/src/plugins/imageformats/shared/qiiofhelpers.cpp b/src/plugins/imageformats/shared/qiiofhelpers.cpp
new file mode 100644
index 0000000..2cd8b74
--- /dev/null
+++ b/src/plugins/imageformats/shared/qiiofhelpers.cpp
@@ -0,0 +1,187 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the MacJp2 plugin in the Qt ImageFormats module.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <qpa/qplatformnativeinterface.h>
+#include <QBuffer>
+#include <QImageIOHandler>
+#include <QImage>
+#include <private/qcore_mac_p.h>
+
+#include "qiiofhelpers_p.h"
+
+#include <ImageIO/ImageIO.h>
+
+QT_BEGIN_NAMESPACE
+
+// Callbacks for sequential data provider & consumer:
+
+static size_t cbGetBytes(void *info, void *buffer, size_t count)
+{
+    QIODevice *dev = static_cast<QIODevice *>(info);
+    if (!dev || !buffer)
+        return 0;
+    qint64 res = dev->read(static_cast<char *>(buffer), count);
+    return qMax(qint64(0), res);
+}
+
+static off_t cbSkipForward(void *info, off_t count)
+{
+    QIODevice *dev = static_cast<QIODevice *>(info);
+    if (!dev || !count)
+        return 0;
+    qint64 res = 0;
+    if (!dev->isSequential()) {
+        qint64 prevPos = dev->pos();
+        dev->seek(prevPos + count);
+        res = dev->pos() - prevPos;
+    } else {
+        char *buf = new char[count];
+        res = dev->read(buf, count);
+        delete[] buf;
+    }
+    return qMax(qint64(0), res);
+}
+
+static void cbRewind(void *)
+{
+    // Ignore this; we do not want the Qt device to be rewound after reading the image
+}
+
+static size_t cbPutBytes(void *info, const void *buffer, size_t count)
+{
+    QIODevice *dev = static_cast<QIODevice *>(info);
+    if (!dev || !buffer)
+        return 0;
+    qint64 res = dev->write(static_cast<const char *>(buffer), count);
+    return qMax(qint64(0), res);
+}
+
+
+// QImage <-> CGImage conversion functions
+typedef QImage (*cgImageToQImagePtr)(CGImageRef image);
+typedef CGImageRef (*qImageToCGImagePtr)(const QImage &image);
+
+QImageIOPlugin::Capabilities QIIOFHelpers::systemCapabilities(const QString &uti)
+{
+    QImageIOPlugin::Capabilities res;
+    QCFString cfUti(uti);
+
+    QCFType<CFArrayRef> cfSourceTypes = CGImageSourceCopyTypeIdentifiers();
+    CFIndex len = CFArrayGetCount(cfSourceTypes);
+    if (CFArrayContainsValue(cfSourceTypes, CFRangeMake(0, len), cfUti))
+        res |= QImageIOPlugin::CanRead;
+
+    QCFType<CFArrayRef> cfDestTypes = CGImageDestinationCopyTypeIdentifiers();
+    len = CFArrayGetCount(cfDestTypes);
+    if (CFArrayContainsValue(cfDestTypes, CFRangeMake(0, len), cfUti))
+        res |= QImageIOPlugin::CanWrite;
+
+    return res;
+}
+
+bool QIIOFHelpers::readImage(QImageIOHandler *q_ptr, QImage *out)
+{
+    static const CGDataProviderSequentialCallbacks cgCallbacks = { 0, &cbGetBytes, &cbSkipForward, &cbRewind, nullptr };
+    static cgImageToQImagePtr cgImageToQImageFn = nullptr;
+    if (!cgImageToQImageFn) {
+        if (QPlatformNativeInterface *pni = QGuiApplication::platformNativeInterface())
+            cgImageToQImageFn = reinterpret_cast<cgImageToQImagePtr>(pni->nativeResourceFunctionForIntegration(QByteArrayLiteral("cgImageToQImage")));
+    }
+
+    if (!q_ptr || !q_ptr->device() || !out || !cgImageToQImageFn)
+        return false;
+
+    QCFType<CGDataProviderRef> cgDataProvider;
+    if (QBuffer *b = qobject_cast<QBuffer *>(q_ptr->device())) {
+        // do direct access to avoid data copy
+        const void *rawData = b->data().constData() + b->pos();
+        cgDataProvider = CGDataProviderCreateWithData(nullptr, rawData, b->data().size() - b->pos(), nullptr);
+    } else {
+        cgDataProvider = CGDataProviderCreateSequential(q_ptr->device(), &cgCallbacks);
+    }
+
+    QCFType<CGImageSourceRef> cgImageSource = CGImageSourceCreateWithDataProvider(cgDataProvider, nullptr);
+    if (!cgImageSource)
+        return false;
+
+    QCFType<CGImageRef> cgImage = CGImageSourceCreateImageAtIndex(cgImageSource, 0, nullptr);
+    if (!cgImage)
+        return false;
+
+    *out = cgImageToQImageFn(cgImage);
+    return !out->isNull();
+}
+
+
+bool QIIOFHelpers::writeImage(QImageIOHandler *q_ptr, const QImage &in, const QString &uti)
+{
+    static const CGDataConsumerCallbacks cgCallbacks = { &cbPutBytes, nullptr };
+    static qImageToCGImagePtr qImageToCGImageFn = nullptr;
+    if (!qImageToCGImageFn) {
+        if (QPlatformNativeInterface *pni = QGuiApplication::platformNativeInterface())
+            qImageToCGImageFn = reinterpret_cast<qImageToCGImagePtr>(pni->nativeResourceFunctionForIntegration(QByteArrayLiteral("qImageToCGImage")));
+    }
+
+    if (!q_ptr || !q_ptr->device() || in.isNull() || !qImageToCGImageFn)
+        return false;
+
+    QCFType<CGImageRef> cgImage = qImageToCGImageFn(in);
+    QCFType<CGDataConsumerRef> cgDataConsumer = CGDataConsumerCreate(q_ptr->device(), &cgCallbacks);
+    QCFType<CFStringRef> cfUti = uti.toCFString();
+    QCFType<CGImageDestinationRef> cgImageDest = CGImageDestinationCreateWithDataConsumer(cgDataConsumer, cfUti, 1, nullptr);
+    if (!cgImageDest || !cgImage)
+        return false;
+
+    QCFType<CFNumberRef> cfVal;
+    QCFType<CFDictionaryRef> cfProps;
+    if (q_ptr->supportsOption(QImageIOHandler::Quality)) {
+        bool ok = false;
+        int writeQuality = q_ptr->option(QImageIOHandler::Quality).toInt(&ok);
+        // If quality is unset, default to 75%
+        float quality = (ok && writeQuality >= 0 ? (qMin(writeQuality, 100)) : 75) / 100.0;
+        cfVal = CFNumberCreate(nullptr, kCFNumberFloatType, &quality);
+        cfProps = CFDictionaryCreate(nullptr, (const void **)&kCGImageDestinationLossyCompressionQuality, (const void **)&cfVal, 1,
+                                     &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
+    }
+    CGImageDestinationAddImage(cgImageDest, cgImage, cfProps);
+    return CGImageDestinationFinalize(cgImageDest);
+}
+
+QT_END_NAMESPACE