From 08fcf41b0a3d4e6066cb72f47c3e1d94bb7fc408 Mon Sep 17 00:00:00 2001
From: James Rowe <jroweboy@gmail.com>
Date: Thu, 17 Jan 2019 00:01:00 -0700
Subject: QT Frontend: Add a Loading screen with progressbar

With shader caches on the horizon, one requirement is to provide visible
feedback for the progress. The shader cache reportedly takes several
minutes to load for large caches that were invalidated, and as such we
should provide a loading screen with progress.

Adds a loading screen widget that will be shown until the first frame of
the game is swapped. This was chosen in case shader caches are not being
used, several games still take more than a few seconds to launch and
could benefit from a loading screen.
---
 src/yuzu/loading_screen.cpp | 71 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/yuzu/loading_screen.cpp

(limited to 'src/yuzu/loading_screen.cpp')

diff --git a/src/yuzu/loading_screen.cpp b/src/yuzu/loading_screen.cpp
new file mode 100644
index 000000000..f2d3214f6
--- /dev/null
+++ b/src/yuzu/loading_screen.cpp
@@ -0,0 +1,71 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <QBuffer>
+#include <QByteArray>
+#include <QHBoxLayout>
+#include <QIODevice>
+#include <QImage>
+#include <QLabel>
+#include <QMovie>
+#include <QPainter>
+#include <QPalette>
+#include <QPixmap>
+#include <QProgressBar>
+#include <QStyleOption>
+#include <QWindow>
+#include "common/logging/log.h"
+#include "core/loader/loader.h"
+#include "ui_loading_screen.h"
+#include "yuzu/loading_screen.h"
+
+LoadingScreen::LoadingScreen(QWidget* parent)
+    : QWidget(parent), ui(std::make_unique<Ui::LoadingScreen>()) {
+    ui->setupUi(this);
+    // Progress bar is hidden until we have a use for it.
+    ui->progress_bar->hide();
+}
+
+LoadingScreen::~LoadingScreen() = default;
+
+void LoadingScreen::Prepare(Loader::AppLoader& loader) {
+    std::vector<u8> buffer;
+    if (loader.ReadBanner(buffer) == Loader::ResultStatus::Success) {
+        backing_mem =
+            std::make_unique<QByteArray>(reinterpret_cast<char*>(buffer.data()), buffer.size());
+        backing_buf = std::make_unique<QBuffer>(backing_mem.get());
+        backing_buf->open(QIODevice::ReadOnly);
+        animation = std::make_unique<QMovie>(backing_buf.get(), QByteArray("GIF"));
+        animation->start();
+        ui->banner->setMovie(animation.get());
+        buffer.clear();
+    }
+    if (loader.ReadLogo(buffer) == Loader::ResultStatus::Success) {
+        QPixmap map;
+        map.loadFromData(buffer.data(), buffer.size());
+        ui->logo->setPixmap(map);
+    }
+}
+
+void LoadingScreen::OnLoadProgress(std::size_t value, std::size_t total) {
+    if (total != previous_total) {
+        ui->progress_bar->setMaximum(total);
+        previous_total = total;
+    }
+    ui->progress_bar->setValue(value);
+}
+
+void LoadingScreen::paintEvent(QPaintEvent* event) {
+    QStyleOption opt;
+    opt.init(this);
+    QPainter p(this);
+    style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
+    QWidget::paintEvent(event);
+}
+
+void LoadingScreen::Clear() {
+    animation.reset();
+    backing_buf.reset();
+    backing_mem.reset();
+}
-- 
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