media-plugins/qt-heif-image-plugin: load RGB888 heif images with libheif 1.7.0

Add upstream patch to fix issue.

Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>

media-plugins/qt-heif-image-plugin/files/qt-heif-image-plugin-0.3.3_RGB88.patch

@@ -0,0 +1,49 @@
+From 3288ae60b96efa404fbeb40598a8567bc8c75761 Mon Sep 17 00:00:00 2001
+From: Markus Diem <diemmarkus@gmail.com>
+Date: Mon, 22 Jun 2020 11:12:12 +0200
+Subject: [PATCH] maps color format from HEIF to Qt (i.e. RGB88)
+
+- this patch is needed to load RGB888 heif images with libheif 1.7.0
+- maps heif_chroma_interleaved_RGB to QImage::Format_RGB888
+- other conversions are not added because I don't have test images
+---
+ src/qheifhandler.cpp | 20 +++++++++++++++++++-
+ 1 file changed, 19 insertions(+), 1 deletion(-)
+
+diff --git a/src/qheifhandler.cpp b/src/qheifhandler.cpp
+index e1b9933..822c45d 100644
+--- a/src/qheifhandler.cpp
++++ b/src/qheifhandler.cpp
+@@ -288,13 +288,31 @@ bool QHeifHandler::read(QImage* destImage)
+         qWarning("QHeifHandler::read() invalid stride: %d", stride);
+         return false;
+     }
++    
++    // map image format
++    heif_chroma heifFormat = heif_image_get_chroma_format(srcImage.get());
++    QImage::Format qtFormat;
+ 
++    switch (heifFormat) {
++    case heif_chroma_interleaved_RGB: {
++        qtFormat = QImage::Format_RGB888;
++        break;
++    }
++    case heif_chroma_interleaved_RGBA: {
++        qtFormat = QImage::Format_RGBA8888;
++        break;
++    }
++    // TODO: add other formats i.e. heif_chroma_monochrome  here
++    default:
++        qtFormat = QImage::Format_RGBA8888;
++    }
++    
+     // move data ownership to QImage
+     heif_image* dataImage = srcImage.release();
+ 
+     *destImage = QImage(
+         data, imgSize.width(), imgSize.height(),
+-        stride, QImage::Format_RGBA8888,
++        stride, qtFormat,
+         [](void* img) { heif_image_release(static_cast<heif_image*>(img)); },
+         dataImage
+     );

media-plugins/qt-heif-image-plugin/qt-heif-image-plugin-0.3.3-r1.ebuild

@@ -0,0 +1,24 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="Qt plugin for HEIF images"
+HOMEPAGE="https://github.com/jakar/qt-heif-image-plugin"
+SRC_URI="https://github.com/jakar/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="LGPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+RDEPEND="
+	dev-qt/qtcore
+	dev-qt/qtgui
+	>=media-libs/libheif-1.6.1:0=
+"
+DEPEND="${RDEPEND}"
+BDEPEND="virtual/pkgconfig"
+
+PATCHES=( "${FILESDIR}/${P}_RGB88.patch" )