de/df7/src__gui__image__qpixmapcache_8cpp_source.html

// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include <QPainter>

#include <QPixmap>

#include <QPixmapCache>


namespace src_gui_image_qpixmapcache {


void wrapper0(QPainter *painter) {

QPixmap pm;

if (!QPixmapCache::find("my_big_image", &pm)) {

    pm.load("bigimage.png");

    QPixmapCache::insert("my_big_image", pm);

}

painter->drawPixmap(0, 0, pm);


} // wrapper0


} // src_gui_image_qpixmapcache


QPainter
The QPainter class performs low-level painting on widgets and other paint devices.
Definition qpainter.h:46

QPainter::drawPixmap
void drawPixmap(const QRectF &targetRect, const QPixmap &pixmap, const QRectF &sourceRect)
Draws the rectangular portion source of the given pixmap into the given target in the paint device.
Definition qpainter.cpp:4868

QPixmapCache::find
static bool find(const QString &key, QPixmap *pixmap)
Looks for a cached pixmap associated with the given key in the cache.
Definition qpixmapcache.cpp:430

QPixmapCache::insert
static bool insert(const QString &key, const QPixmap &pixmap)
Inserts a copy of the pixmap pixmap associated with the key into the cache.
Definition qpixmapcache.cpp:482

QPixmap
Returns a copy of the pixmap that is transformed using the given transformation transform and transfo...
Definition qpixmap.h:27

QPixmap::load
bool load(const QString &fileName, const char *format=nullptr, Qt::ImageConversionFlags flags=Qt::AutoColor)
Loads a pixmap from the file with the given fileName.
Definition qpixmap.cpp:704

src_gui_image_qpixmapcache
Definition src_gui_image_qpixmapcache.cpp:7

src_gui_image_qpixmapcache::wrapper0
void wrapper0(QPainter *painter)
Definition src_gui_image_qpixmapcache.cpp:9

painter
QPainter painter(this)
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