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/*
SPDX-FileCopyrightText: 2006 Luigi Toscano <luigi.toscano@tiscali.it>
SPDX-FileCopyrightText: 2008 Pino Toscano <pino@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "utils.h"
#include "utils_p.h"
#include "debug_p.h"
#include "settings_core.h"
#include <QApplication>
#include <QIODevice>
#include <QImage>
#include <QRect>
#include <QScreen>
#include <QWidget>
#include <QWindow>
using namespace Okular;
QRect Utils::rotateRect(const QRect source, int width, int height, int orientation)
{
QRect ret;
// adapt the coordinates of the boxes to the rotation
switch (orientation) {
case 1:
ret = QRect(width - source.y() - source.height(), source.x(), source.height(), source.width());
break;
case 2:
ret = QRect(width - source.x() - source.width(), height - source.y() - source.height(), source.width(), source.height());
break;
case 3:
ret = QRect(source.y(), height - source.x() - source.width(), source.height(), source.width());
break;
case 0: // no modifications
default: // other cases
ret = source;
}
return ret;
}
QSizeF Utils::realDpi(const QWindow *windowOnScreen)
{
const QScreen *screen = windowOnScreen ? windowOnScreen->screen() : qGuiApp->primaryScreen();
if (screen) {
const QSizeF res(screen->physicalDotsPerInchX(), screen->physicalDotsPerInchY());
if (res.width() > 0 && res.height() > 0) {
if (qAbs(res.width() - res.height()) / qMin(res.height(), res.width()) < 0.15) {
return res;
} else {
qCDebug(OkularCoreDebug) << "QScreen calculation returned a non square dpi." << res << ". Falling back";
}
}
}
return QSizeF(72, 72);
}
inline static bool isPaperColor(QRgb argb, QRgb paperColor)
{
return (argb & 0xFFFFFF) == (paperColor & 0xFFFFFF); // ignore alpha
}
NormalizedRect Utils::imageBoundingBox(const QImage *image)
{
if (!image) {
return NormalizedRect();
}
const int width = image->width();
const int height = image->height();
const QRgb paperColor = SettingsCore::paperColor().rgb();
int left, top, bottom, right, x, y;
#ifdef BBOX_DEBUG
QTime time;
time.start();
#endif
// Scan pixels for top non-white
for (top = 0; top < height; ++top) {
for (x = 0; x < width; ++x) {
if (!isPaperColor(image->pixel(x, top), paperColor)) {
goto got_top;
}
}
}
return NormalizedRect(0, 0, 0, 0); // the image is blank
got_top:
left = right = x;
// Scan pixels for bottom non-white
for (bottom = height - 1; bottom >= top; --bottom) {
for (x = width - 1; x >= 0; --x) {
if (!isPaperColor(image->pixel(x, bottom), paperColor)) {
goto got_bottom;
}
}
}
Q_ASSERT(0); // image changed?!
got_bottom:
if (x < left) {
left = x;
}
if (x > right) {
right = x;
}
// Scan for leftmost and rightmost (we already found some bounds on these):
for (y = top; y <= bottom && (left > 0 || right < width - 1); ++y) {
for (x = 0; x < left; ++x) {
if (!isPaperColor(image->pixel(x, y), paperColor)) {
left = x;
}
}
for (x = width - 1; x > right + 1; --x) {
if (!isPaperColor(image->pixel(x, y), paperColor)) {
right = x;
}
}
}
NormalizedRect bbox(QRect(left, top, (right - left + 1), (bottom - top + 1)), image->width(), image->height());
#ifdef BBOX_DEBUG
qCDebug(OkularCoreDebug) << "Computed bounding box" << bbox << "in" << time.elapsed() << "ms";
#endif
return bbox;
}
void Okular::copyQIODevice(QIODevice *from, QIODevice *to)
{
QByteArray buffer(65536, '\0');
qint64 read = 0;
while ((read = from->read(buffer.data(), buffer.size())) > 0) {
qint64 written = to->write(buffer.constData(), read);
if (read != written) {
break;
}
}
}
QTransform Okular::buildRotationMatrix(Rotation rotation)
{
QTransform matrix;
matrix.rotate((int)rotation * 90);
switch (rotation) {
case Rotation90:
matrix.translate(0, -1);
break;
case Rotation180:
matrix.translate(-1, -1);
break;
case Rotation270:
matrix.translate(-1, 0);
break;
default:;
}
return matrix;
}
/* kate: replace-tabs on; indent-width 4; */
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