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/**********************************************************************
** Copyright (C) 2000-2006 Trolltech AS. All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 2 of the License, or (at your
** option) any later version.
**
** A copy of the GNU GPL license version 2 is included in this package as
** LICENSE.GPL.
**
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU General Public License for more details.
**
** In addition, as a special exception Trolltech gives permission to link
** the code of this program with Qtopia applications copyrighted, developed
** and distributed by Trolltech under the terms of the Qtopia Personal Use
** License Agreement. You must comply with the GNU General Public License
** in all respects for all of the code used other than the applications
** licensed under the Qtopia Personal Use License Agreement. If you modify
** this file, you may extend this exception to your version of the file,
** but you are not obligated to do so. If you do not wish to do so, delete
** this exception statement from your version.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "image.h"
#include <qfileinfo.h>
#include <qimage.h>
#include <qstring.h>
/*!
Returns an image created by loading the \a filename,
and scalining it, preserving aspect ratio, to fit in
\a width by \a height pixels.
First availability: Qtopia 2.0
*/
QImage Image::loadScaled(const QString & filename, const int width, const int height,
ScaleMode mode)
{
QImageIO iio;
QString param;
int w = width;
int h = height;
if (width == 0 || height == 0)
return QImage();
iio.setFileName(filename);
//
// Try and load and scale the image in one hit.
//
param.sprintf("GetHeaderInformation");
iio.setParameters(param);
iio.read();
//
// If we don't have bits(), read() understands parameters,
// and we can setup for fast reading. Otherwise, take the
// performance hit and do things slowly.
//
if (!iio.image().bits()) {
if ((iio.image().width() < w) && (iio.image().height() < h)) {
param.sprintf("%s", "Fast"); // No Tr
}
else {
int shrink_factor = 1;
QString smode;
switch (mode) {
case ScaleMin:
smode = "ScaleMin";
shrink_factor = QMAX(iio.image().width() / w, iio.image().height() / h);
break;
case ScaleMax:
smode = "ScaleMax";
shrink_factor = QMIN(iio.image().width() / w, iio.image().height() / h);
break;
case ScaleFree:
smode = "ScaleFree";
shrink_factor = QMIN(iio.image().width() / w, iio.image().height() / h);
break;
}
param.sprintf("Scale( %i, %i, %s )%s, Shrink( %i )", // No tr
w, h, smode.latin1(), ", Fast", shrink_factor); // No tr
}
iio.setParameters(param);
iio.read();
return iio.image();
}
if ((iio.image().width() > w) || (iio.image().height() > h)) {
QSize s = aspectScaleSize(iio.image().width(), iio.image().height(), w, h, mode);
return iio.image().smoothScale(s.width(), s.height());
}
return iio.image();
}
//
// Returns new size of image, scaled to target_width and target_height,
// whilst preserving aspect ratio. Useful when it's not possible to
// scale an image prior to using it (eg. using RichText). Should be in
// global image utils.
//
// NOTE
// - expensive for images whose drivers do not allow us to retrieve
// parameters without reading the entire image. Currently (20030930)
// only the jpeg driver allows parameter reading.
//
QSize Image::loadScaledImageSize(const QString & filename, int target_width, int target_height,
int maxscale, ScaleMode mode)
{
QImageIO iio;
iio.setFileName(filename);
iio.setParameters("GetHeaderInformation");
iio.read();
int w = iio.image().width();
int h = iio.image().height();
//
// Scaling up small pictures can be very ugly.
// Leave them alone if they are too small.
//
if (maxscale && w * maxscale < target_width && h * maxscale < target_height)
return QSize(w * maxscale, h * maxscale);
return aspectScaleSize(w, h, target_width, target_height, mode);
}
// Load an image to be used as a portrait. Force its height to height,
// scale width to new height, and crop the width if it's still > width
// XXX : Should be using integer math
QImage Image::loadPortrait(const QString & filename, const int width, const int height)
{
QImageIO iio;
QString param;
int w = width;
int h = height;
if (width == 0 || height == 0)
return QImage();
iio.setFileName(filename);
//
// Try and load and scale the image in one hit.
//
param.sprintf("GetHeaderInformation");
iio.setParameters(param);
iio.read();
//
// If we don't have bits(), read() understands parameters,
// and we can setup for fast reading. Otherwise, take the
// performance hit and do things slowly.
//
if (!iio.image().bits()) {
w = (int) ((double) iio.image().width() / (double) (iio.image().height()) *
(double) height);
param.sprintf("Scale( %i, %i, ScaleFree )%s", // No tr
w, h, ", Fast"); // No tr
iio.setParameters(param);
iio.read();
if (w > width) {
int x = (int) ((double) (w - width) / 2);
QRect r(x, 0, width, height);
return iio.image().copy(r);
}
else
return iio.image();
}
else
//scale width to the new height
return sizeToPortrait(iio.image(), width, height);
}
QImage Image::sizeToPortrait(const QImage & image, const int width, const int height)
{
int w = (image.width() * height) / image.height();
if (w > width) {
int x = (w - width) / 2;
QRect r(x, 0, width, height);
return image.smoothScale(w, height).copy(r);
}
else
return image.smoothScale(width, height);
}
//
// Return (w x h) scaled to (target_width x target_height) with aspect
// ratio preserved.
//
QSize
Image::aspectScaleSize(const int w, const int h, const int target_width,
const int target_height, ScaleMode mode)
{
QSize s;
if (mode == ScaleFree) {
s = QSize(target_width, target_height);
}
else {
bool useHeight = TRUE;
int rw = target_height * w / h;
if (mode == ScaleMin) {
useHeight = (rw <= target_width);
}
else { // mode == ScaleMax
useHeight = (rw >= target_width);
}
if (useHeight) {
s = QSize(rw, target_height);
}
else {
s = QSize(target_width, target_width * h / w);
}
}
return s;
}
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