Qt supports HEIC/HEIF format images

HEIF 格式简介（From Baidu Know）

heicThe format is for AppleiOS11A specially developed photo format.Heic是Apple iOS和macOS的文件格式,For processing images and videos.Heic是IOS 11The system replaces the original videos and photosH.264和JEP格式.HeicFormatting not only saves memory,Original image quality is also preserved.Heic格式是Apple iOS和macOS的专用格式
与JPG相比,它占用的空间更小,画质更加无损.HEIC格式照片支持iOS11及macOS High Sierra（10.13）及更新版本.但是此种格式是无法在Windows 中直接使用看图软件打开的（Windows10 RS4开始支持该格式）.

HEIF和HEIC的关系?

HEIF 是图片格式,HEVC （HEVC 是编码格式(比如 H.264,H.265)）进行编码的 HEIF The picture is suffixed with .heic 的图片

Qt 支持HEIF插件编译

首先声明,Qt官方并未支持heic格式图片,But there are already great gods based on itlibheiflibrary didQt的插件,This article is just to help you solve how to compile thisHeif插件

• 插件github地址
• 编译依赖：Cmake、libheif (≥ version 1.1)、Qt 5 (Core and GUI modules)

The official documentation says that compiling depends on cmake、pkg-config（个人不了解,If there is a god, please give pointers）是不准确的,容易产生误导,The real dependency isQt+libheif并且通过Cmake进行构建工程

下载编译qt-heif-image-plugin

git clone [email protected]:jakar/qt-heif-image-plugin.git

First of all, we will get an error when compiling directly

The essence here is that we can't find itpkg-config的库,So we need to solve the compilation environment configuration problem first

配置构建环境

Libheif地址
安装Libheif,github的readmehas been clearly stated in "Libheif is included in Vcpkg.",The library is already includedVcpkg中,To simplify we also need to compile it ourselvesLibheif,我们直接使用Vcpkg 进行安装Libheif

下载并安装vcpkg

 > git clone https://github.com/microsoft/vcpkg

> .\vcpkg\bootstrap-vcpkg.bat

安装Libheif（以64bit column）

#指定安装(编译)64位库
> .\vcpkg\vcpkg install libheif:x64-windows
#指定安装(编译)32位库
> .\vcpkg\vcpkg install libheif:x86-windows
#默认安装32位
> .\vcpkg\vcpkg install libheif 

Libheif Dependencies required during compilation are automatically downloaded（All of a sudden it's simple）
编译安装之后,输出

安装pkg-config

Because it will be revised laterCmake文件,It wasn't really used laterpkg-config,此步骤可以忽略,Do your best to follow along

./vcpkg install pkgconf:x64-windows

如何让Cmake 知道我们安装的vcpkg库？

• cmake要用vcpkg下载的库
• 设置DCMAKE_TOOLCHAIN_FILE

“-DCMAKE_TOOLCHAIN_FILE=[path to vcpkg]/scripts/buildsystems/vcpkg.cmake”

我的目录是E:\Git\vcpkg

E:\Git\vcpkg\downloads\tools\cmake-3.22.2-windows\cmake-3.22.2-windows-i386\bin\cmake -B ./build_2019 -G "Visual Studio 16 2019" -A x64 -S . "-DCMAKE_TOOLCHAIN_FILE=E:\\Git\\vcpkg\\scripts\\buildsystems\\vcpkg.cmake"

构建

如果下载了pkg-configCan be directly built successfully,Otherwise, it needs to be modified firstCmake文件,才可以构建VS工程

修改Cmake

cmake_minimum_required(VERSION 3.5)  # lowest version tried
#新增加===
#DEBUG增加后缀
set(CMAKE_DEBUG_POSTFIX "d")
set(LIBHEIF_PATH E:\\Git\\vcpkg\\installed\\x64-windows)
###Add your own path here
set(LIBHEIF_INC_DIR ${LIBHEIF_PATH}\\include)
set(LIBHEIF_LIB_DIR ${LIBHEIF_PATH}\\lib)
#Set additional header files
include_directories(${LIBHEIF_INC_DIR})
#设置附加库目录
link_directories(${LIBHEIF_LIB_DIR})
#新增加===

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# make release build, if not specified
# (from https://blog.kitware.com/cmake-and-the-default-build-type/)
set(default_build_type "RelWithDebInfo")

if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE STRING "Build type" FORCE)
  set_property(
    CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
    "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif ()

# compiler flags
# TODO: separate GCC and Clang warnings; add more
#修改==
set(
  CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \ -Wall \ ")
#set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Og")
#修改===

set(sanitizer_flags "-fsanitize=address -fsanitize=undefined")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${sanitizer_flags}")
set(CMAKE_MODULE_LINKER_FLAGS_DEBUG
    "${CMAKE_MODULE_LINKER_FLAGS_DEBUG} ${sanitizer_flags}")

#
# third-party libs
#

# qt
find_package(Qt5 COMPONENTS Core Gui REQUIRED)
add_definitions(-DQT_NO_KEYWORDS)
set(CMAKE_AUTOMOC ON)

# libheif
#修改==
#find_package(PkgConfig)
#pkg_check_modules(libheif REQUIRED libheif>=1.1)

set (LIB_HEIF heif libx265 libde265) 
#修改==
#
# project source
#

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(sources main.cpp qheifhandler.cpp)


add_library(qheif MODULE ${sources})
#修改==
target_link_libraries(
  qheif
  PRIVATE
  Qt5::Gui
  ${LIB_HEIF}
)
#修改==

#
# installation
#

# Use qmake to find plugin dir (adapted from lxqt-qtplugin)
get_target_property(
  QT_QMAKE_EXECUTABLE ${Qt5Core_QMAKE_EXECUTABLE} IMPORTED_LOCATION)

if (NOT QT_QMAKE_EXECUTABLE)
  message(FATAL_ERROR "qmake is not found.")
endif ()

execute_process(
  COMMAND ${QT_QMAKE_EXECUTABLE} -query QT_INSTALL_PLUGINS
  OUTPUT_VARIABLE QT_PLUGINS_DIR
  OUTPUT_STRIP_TRAILING_WHITESPACE)

if (QT_PLUGINS_DIR)
  message(STATUS "Qt5 plugin directory: " "${QT_PLUGINS_DIR}")
else ()
  message(FATAL_ERROR "Qt5 plugin directory cannot be detected.")
endif ()

# Prefix with DESTDIR if available to allow packaging
if (ENV{
    DESTDIR} AND NOT ENV{
    DESTDIR} STREQUAL "")
  set(plugins_dir "$ENV{DESTDIR}${QT_PLUGINS_DIR}")
else ()
  set(plugins_dir "${QT_PLUGINS_DIR}")
endif ()

install(
  TARGETS qheif
  LIBRARY DESTINATION "${plugins_dir}/imageformats")

# vim:sw=2 

验证

• VS直接打开Demo工程
• Modify the example source code

#include <QApplication>
#include <QDebug>
#include <QImage>
#include<QImageReader>
#include <QLabel>
const QString path="E:\\Git\\qt-heif-image-plugin\\bird_burst.heic";
int main(int argc, char *argv[])
{
    
    QApplication a(argc, argv);
    //Output supported images
    qDebug()<<QImageReader::supportedImageFormats();
    const QString imgPath(path);
    QImage image(imgPath);
    if (!image.isNull()) {
    
        qDebug() << "image size:" << image.size();
        QLabel* label = new QLabel();
        int w = 0;
        int h = 0;
        if (image.width() > image.height()) {
    
            w = 1400;
            h = (1.0 * image.height()) / (1.0 * image.width() * 1400);
        } else {
    
            h = 1400;
            w = (1.0 * 1400 * image.height()) /(1.0 * image.width());
        }
        qDebug() << w << h;
        const QPixmap pixmap = QPixmap::fromImage(image);
        label->setPixmap(pixmap);
        label->show();
        label->resize(image.size());
     } else {
    
           qCritical() << "Invalid image:" << imgPath;
    }

    return a.exec();
}

• 编译
• 使用windeployqt打包exe

windeployqt qtheif.exe

• 把qheif.dllCopied to the program running directoryimageformats下

• 把heif.dll、libde265.dll、libx265.dllCopy to the root directory of the program running directory
  

• 运行程序,Pictures can be loaded and displayed
  
  参考文献
  vcpkg 快速入门
  HEIF&HEIC