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[app] Improved rendering of book covers

Browse source 
Especially narrow ones.
This commit is contained in:
Slava Monich 2021-11-01 00:40:49 +02:00
parent 491cfbd8b2
commit d4977b1a1f
4 changed files with 206 additions and 62 deletions
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17
app/qml/BooksCoverPage.qml
View file

@ -1,20 +1,21 @@
/*
Copyright (C) 2015 Jolla Ltd.
Contact: Slava Monich <slava.monich@jolla.com>
Copyright (C) 2015-2021 Jolla Ltd.
Copyright (C) 2015-2021 Slava Monich <slava.monich@jolla.com>
You may use this file under the terms of BSD license as follows:
You may use this file under the terms of the BSD license as follows:
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Jolla Ltd nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
* Neither the names of the copyright holders nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
@ -60,7 +61,7 @@ CoverBackground {
width: grid.cellWidth
height: grid.cellHeight
borderWidth: 0
stretch: true
mode: BookCover.Stretch
}
}
@ -95,7 +96,7 @@ CoverBackground {
synchronous: true
book: root.book ? root.book : null
defaultCover: "images/default-cover.jpg"
stretch: true
mode: BookCover.Fill
}
BooksTitleText {

1
app/qml/BooksShelfItem.qml
View file

@ -103,6 +103,7 @@ Item {
borderRadius: _borderRadius
borderWidth: book ? _borderWidth : 0
borderColor: _borderColor
mode: BookCover.Bottom
opacity: (copyingIn || copyingOut) ? 0.1 : 1
Behavior on opacity { FadeAnimation { } }

209
app/src/BooksCoverWidget.cpp
View file

@ -1,6 +1,6 @@
/*
* Copyright (C) 2015-2018 Jolla Ltd.
* Copyright (C) 2015-2018 Slava Monich <slava.monich@jolla.com>
* Copyright (C) 2015-2021 Jolla Ltd.
* Copyright (C) 2015-2021 Slava Monich <slava.monich@jolla.com>
*
* You may use this file under the terms of the BSD license as follows:
*
@ -8,15 +8,15 @@
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Nemo Mobile nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@ -50,19 +50,28 @@ public:
ScaleTask(QThreadPool* aPool, QImage aImage, int aWidth, int aHeight,
bool aStretch);
static QImage scale(QImage aImage, int aWidth, int aHeight, bool aStretch);
static QColor leftBackground(const QImage& aImage);
static QColor rightBackground(const QImage& aImage);
static QColor topBackground(const QImage& aImage);
static QColor bottomBackground(const QImage& aImage);
static QColor pickColor(const QHash<QRgb,int>& aColorCounts);
void performTask();
public:
QImage iImage;
QImage iScaledImage;
QColor iBackground1; // Left or top
QColor iBackground2; // Right or bottom
int iWidth;
int iHeight;
bool iStretch;
};
BooksCoverWidget::ScaleTask::ScaleTask(QThreadPool* aPool, QImage aImage,
int aWidth, int aHeight, bool aStretch) : HarbourTask(aPool),
iImage(aImage), iWidth(aWidth), iHeight(aHeight), iStretch(aStretch)
int aWidth, int aHeight, bool aStretch) : HarbourTask(aPool), iImage(aImage),
iBackground1(Qt::transparent), iBackground2(Qt::transparent),
iWidth(aWidth), iHeight(aHeight),
iStretch(aStretch)
{
}
@ -79,10 +88,106 @@ QImage BooksCoverWidget::ScaleTask::scale(QImage aImage,
}
}
// The idea is to pick the colors which occur more often
// at the edges of the picture.
QColor BooksCoverWidget::ScaleTask::leftBackground(const QImage& aImage)
{
QHash<QRgb,int> counts;
if (aImage.width() > 0) {
const int h = aImage.height();
for (int y = 0; y < h; y++) {
const QRgb left(aImage.pixelColor(0, y).rgb());
counts.insert(left, counts.value(left) + 1);
}
}
const QColor color(pickColor(counts));
HDEBUG(color << "left" << counts.count());
return color;
}
QColor BooksCoverWidget::ScaleTask::rightBackground(const QImage& aImage)
{
QHash<QRgb,int> counts;
const int w = aImage.width();
if (w > 0) {
const int h = aImage.height();
for (int y = 0; y < h; y++) {
const QRgb right(aImage.pixelColor(w - 1, y).rgb());
counts.insert(right, counts.value(right) + 1);
}
}
const QColor color(pickColor(counts));
HDEBUG(color << "right" << counts.count());
return color;
}
QColor BooksCoverWidget::ScaleTask::topBackground(const QImage& aImage)
{
QHash<QRgb,int> counts;
if (aImage.height() > 0) {
const int w = aImage.width();
for (int x = 0; x < w; x++) {
const QRgb left(aImage.pixelColor(x, 0).rgb());
counts.insert(left, counts.value(left) + 1);
}
}
const QColor color(pickColor(counts));
HDEBUG(color << "top" << counts.count());
return color;
}
QColor BooksCoverWidget::ScaleTask::bottomBackground(const QImage& aImage)
{
QHash<QRgb,int> counts;
const int h = aImage.height();
if (h > 0) {
const int w = aImage.width();
for (int x = 0; x < w; x++) {
const QRgb left(aImage.pixelColor(x, h - 1).rgb());
counts.insert(left, counts.value(left) + 1);
}
}
const QColor color(pickColor(counts));
HDEBUG(color << "bottom" << counts.count());
return color;
}
QColor BooksCoverWidget::ScaleTask::pickColor(const QHash<QRgb,int>& aCounts)
{
if (aCounts.size() > 0) {
QRgb rgb;
int max;
QHashIterator<QRgb,int> it(aCounts);
for (max = 0; it.hasNext();) {
it.next();
const int count = it.value();
if (max < count) {
max = count;
rgb = it.key();
}
}
return QColor(rgb);
}
return QColor();
}
void BooksCoverWidget::ScaleTask::performTask()
{
if (!iImage.isNull() && !isCanceled()) {
iScaledImage = scale(iImage, iWidth, iHeight, iStretch);
if (!isCanceled()) {
if (iScaledImage.width() < iWidth) {
iBackground1 = leftBackground(iScaledImage);
if (!isCanceled()) {
iBackground2 = rightBackground(iScaledImage);
}
} else if (iScaledImage.height() < iHeight) {
iBackground1 = topBackground(iScaledImage);
if (!isCanceled()) {
iBackground2 = bottomBackground(iScaledImage);
}
}
}
}
}
@ -204,7 +309,7 @@ BooksCoverWidget::BooksCoverWidget(QQuickItem* aParent) :
iBorderWidth(0),
iBorderRadius(0),
iBorderColor(Qt::transparent),
iStretch(false),
iMode(Bottom),
iSynchronous(false)
{
setFlag(ItemHasContents, true);
@ -264,13 +369,13 @@ void BooksCoverWidget::onCoverImageChanged()
scaleImage(wasEmpty);
}
void BooksCoverWidget::setStretch(bool aValue)
void BooksCoverWidget::setMode(Mode aMode)
{
if (iStretch != aValue) {
iStretch = aValue;
HDEBUG(aValue);
if (iMode != aMode) {
iMode = aMode;
HDEBUG(aMode);
scaleImage();
Q_EMIT stretchChanged();
Q_EMIT modeChanged();
}
}
@ -362,12 +467,20 @@ void BooksCoverWidget::scaleImage(bool aWasEmpty)
}
if (!iCoverImage.isNull()) {
const bool stretch = (iMode == Stretch);
if (iSynchronous) {
iScaledImage = ScaleTask::scale(iCoverImage, w, h, iStretch);
iScaledImage = ScaleTask::scale(iCoverImage, w, h, stretch);
if (iScaledImage.width() < w) {
iBackground1 = ScaleTask::leftBackground(iScaledImage);
iBackground2 = ScaleTask::rightBackground(iScaledImage);
} else if (iScaledImage.height() < h) {
iBackground1 = ScaleTask::topBackground(iScaledImage);
iBackground2 = ScaleTask::bottomBackground(iScaledImage);
}
update();
} else {
(iScaleTask = new ScaleTask(iTaskQueue->pool(), iCoverImage, w, h,
iStretch))->submit(this, SLOT(onScaleTaskDone()));
(iScaleTask = new ScaleTask(iTaskQueue->pool(), iCoverImage,
w, h, stretch))->submit(this, SLOT(onScaleTaskDone()));
}
} else {
iScaledImage = QImage();
@ -389,6 +502,8 @@ void BooksCoverWidget::onScaleTaskDone()
const bool wasEmpty(empty());
HASSERT(iScaleTask == sender());
iScaledImage = iScaleTask->iScaledImage;
iBackground1 = iScaleTask->iBackground1;
iBackground2 = iScaleTask->iBackground2;
iScaleTask->release(this);
iScaleTask = NULL;
update();
@ -403,28 +518,17 @@ void BooksCoverWidget::paint(QPainter* aPainter)
const qreal w = width();
const qreal h = height();
if (w > 0 && h > 0) {
qreal sw, sh;
// This has to be consistent with updateCenter()
if (!iScaledImage.isNull()) {
sw = iScaledImage.width();
sh = iScaledImage.height();
} else {
sw = w;
sh = h;
}
const int x = floor((w - sw)/2);
const int y = h - sh;
const qreal sh = (iScaledImage.height() && iMode == Bottom) ?
qMax((qreal)iScaledImage.height(), w) : h;
QPainterPath path;
qreal w1, h1, x1, y1;
if (iBorderRadius > 0) {
// The border rectangle is no less that 3*radius
// and no more than the size of the item.
const qreal d = 2*iBorderRadius;
w1 = qMin(w, qMax(sw, 2*d)) - iBorderWidth;
w1 = qMin(w, qMax(w, 2*d)) - iBorderWidth;
h1 = qMin(h, qMax(sh, 3*d)) - iBorderWidth;
x1 = floor((w - w1)/2);
y1 = h - h1 - iBorderWidth/2;
@ -439,13 +543,41 @@ void BooksCoverWidget::paint(QPainter* aPainter)
path.closeSubpath();
aPainter->setClipPath(path);
} else {
w1 = sw - iBorderWidth;
w1 = w - iBorderWidth;
h1 = sh - iBorderWidth;
x1 = floor((w - w1)/2);
y1 = h - h1 - iBorderWidth/2;
}
const int x = floor((w - iScaledImage.width())/2);
const int y = floor(h - (sh + iScaledImage.height())/2);
if (!iScaledImage.isNull()) {
if (x > 0) {
aPainter->setPen(Qt::NoPen);
if (iBackground1.isValid()) {
aPainter->setBrush(QBrush(iBackground1));
aPainter->drawRect(0, y, x, iScaledImage.height());
}
if (iBackground2.isValid()) {
const int left = x + iScaledImage.width();
aPainter->setBrush(QBrush(iBackground2));
aPainter->drawRect(left, y, x, iScaledImage.height());
}
} else {
const int top = h - sh;
if (y > top) {
aPainter->setPen(Qt::NoPen);
if (iBackground1.isValid()) {
aPainter->setBrush(QBrush(iBackground1));
aPainter->drawRect(0, 0, w, y - top);
}
if (iBackground2.isValid()) {
aPainter->setBrush(QBrush(iBackground2));
aPainter->drawRect(0, y + iScaledImage.height(), w, y - top);
}
}
}
aPainter->drawImage(x, y, iScaledImage);
}
@ -475,7 +607,8 @@ void BooksCoverWidget::updateCenter()
if (iScaledImage.isNull()) {
iCenter.setY(floor(h/2));
} else {
iCenter.setY(floor(h - iScaledImage.height()/2));
const qreal sh = qMax((qreal)iScaledImage.height(), w);
iCenter.setY(floor(h - sh/2));
}
if (iCenter != oldCenter) {

41
app/src/BooksCoverWidget.h
View file

@ -1,6 +1,6 @@
/*
* Copyright (C) 2015-2018 Jolla Ltd.
* Copyright (C) 2015-2018 Slava Monich <slava.monich@jolla.com>
* Copyright (C) 2015-2021 Jolla Ltd.
* Copyright (C) 2015-2021 Slava Monich <slava.monich@jolla.com>
*
* You may use this file under the terms of the BSD license as follows:
*
@ -8,15 +8,15 @@
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Nemo Mobile nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@ -49,8 +49,8 @@ class BooksCoverWidget: public QQuickPaintedItem
Q_OBJECT
Q_PROPERTY(bool empty READ empty NOTIFY emptyChanged)
Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged)
Q_PROPERTY(bool stretch READ stretch WRITE setStretch NOTIFY stretchChanged)
Q_PROPERTY(bool synchronous READ synchronous WRITE setSynchronous NOTIFY synchronousChanged)
Q_PROPERTY(Mode mode READ mode WRITE setMode NOTIFY modeChanged)
Q_PROPERTY(qreal borderWidth READ borderWidth WRITE setBorderWidth NOTIFY borderWidthChanged)
Q_PROPERTY(qreal borderRadius READ borderRadius WRITE setBorderRadius NOTIFY borderRadiusChanged)
Q_PROPERTY(QColor borderColor READ borderColor WRITE setBorderColor NOTIFY borderColorChanged)
@ -59,8 +59,15 @@ class BooksCoverWidget: public QQuickPaintedItem
Q_PROPERTY(qreal centerX READ centerX NOTIFY centerXChanged)
Q_PROPERTY(qreal centerY READ centerY NOTIFY centerYChanged)
Q_PROPERTY(QPoint center READ center NOTIFY centerChanged)
Q_ENUMS(Mode)
public:
enum Mode {
Fill,
Stretch,
Bottom
};
BooksCoverWidget(QQuickItem* aParent = NULL);
~BooksCoverWidget();
@ -82,8 +89,8 @@ public:
BooksBook* book() const { return iBook; }
void setBook(BooksBook* aBook);
bool stretch() const { return iStretch; }
void setStretch(bool aValue);
Mode mode() const { return iMode; }
void setMode(Mode aMode);
bool synchronous() const { return iSynchronous; }
void setSynchronous(bool aValue);
@ -96,8 +103,8 @@ Q_SIGNALS:
void bookChanged();
void emptyChanged();
void loadingChanged();
void stretchChanged();
void synchronousChanged();
void modeChanged();
void borderWidthChanged();
void borderRadiusChanged();
void borderColorChanged();
@ -124,6 +131,8 @@ private:
ScaleTask* iScaleTask;
QImage iScaledImage;
QImage iCoverImage;
QColor iBackground1;
QColor iBackground2;
BooksBook* iBook;
QImage* iDefaultImage;
qreal iBorderWidth;
@ -132,7 +141,7 @@ private:
QUrl iDefaultCover;
QString iTitle;
QPoint iCenter;
bool iStretch;
Mode iMode;
bool iSynchronous;
};