Diffstat (limited to 'noncore/multimedia/camera2/image.cpp') (more/less context) (ignore whitespace changes)
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diff --git a/noncore/multimedia/camera2/image.cpp b/noncore/multimedia/camera2/image.cpp new file mode 100644 index 0000000..39b6d8b --- a/dev/null +++ b/noncore/multimedia/camera2/image.cpp @@ -0,0 +1,239 @@ +/********************************************************************** +** 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; +} + |