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205 lines
4.1 KiB
C++
205 lines
4.1 KiB
C++
/**
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* \file GuiImage.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Angus Leeming
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* \author John Levon
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include <math.h> /* ceil */
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#include "GuiImage.h"
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#include "qt_helpers.h"
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#include "Format.h"
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#include "graphics/GraphicsParams.h"
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#include "support/debug.h"
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#include "support/FileName.h"
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#include "support/lstrings.h" // ascii_lowercase
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#include <QPainter>
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#include <QImageReader>
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using namespace std;
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using namespace lyx::support;
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namespace lyx {
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namespace graphics {
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/// Implement factory method defined in GraphicsImage.h
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Image * newImage()
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{
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return new GuiImage;
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}
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GuiImage::GuiImage() : is_transformed_(false)
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{}
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GuiImage::GuiImage(GuiImage const & other)
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: Image(other), original_(other.original_),
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transformed_(other.transformed_), is_transformed_(other.is_transformed_),
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fname_(other.fname_)
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{}
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Image * GuiImage::clone() const
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{
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return new GuiImage(*this);
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}
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QImage const & GuiImage::image() const
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{
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return is_transformed_ ? transformed_ : original_;
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}
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unsigned int GuiImage::width() const
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{
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#if QT_VERSION >= 0x050000
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return is_transformed_ ?
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ceil(transformed_.width() / transformed_.devicePixelRatio()) :
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ceil(original_.width() / original_.devicePixelRatio());
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#else
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return is_transformed_ ? transformed_.width() : original_.width();
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#endif
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}
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unsigned int GuiImage::height() const
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{
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#if QT_VERSION >= 0x050000
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return is_transformed_ ?
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ceil(transformed_.height() / transformed_.devicePixelRatio()) :
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ceil(original_.height() / original_.devicePixelRatio());
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#else
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return is_transformed_ ? transformed_.height() : original_.height();
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#endif
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}
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bool GuiImage::load(FileName const & filename)
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{
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if (!original_.isNull()) {
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LYXERR(Debug::GRAPHICS, "Image is loaded already!");
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return false;
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}
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fname_ = toqstr(filename.absFileName());
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return load();
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}
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bool GuiImage::load()
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{
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if (!original_.load(fname_)) {
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LYXERR(Debug::GRAPHICS, "Unable to open image");
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return false;
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}
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return true;
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}
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bool GuiImage::setPixmap(Params const & params)
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{
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if (!params.display)
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return false;
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if (original_.isNull()) {
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if (!load())
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return false;
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}
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#if QT_VERSION >= 0x050000
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original_.setDevicePixelRatio(params.pixel_ratio);
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#endif
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is_transformed_ = clip(params);
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is_transformed_ |= rotate(params);
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is_transformed_ |= scale(params);
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// Clear the pixmap to save some memory.
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if (is_transformed_)
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original_ = QImage();
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else
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transformed_ = QImage();
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return true;
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}
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bool GuiImage::clip(Params const & params)
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{
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if (params.bb.empty())
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// No clipping is necessary.
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return false;
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int const new_width = params.bb.xr - params.bb.xl;
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int const new_height = params.bb.yt - params.bb.yb;
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QImage const & image = is_transformed_ ? transformed_ : original_;
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// No need to check if the width, height are > 0 because the
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// Bounding Box would be empty() in this case.
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if (new_width > image.width() || new_height > image.height()) {
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// Bounds are invalid.
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return false;
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}
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if (new_width == image.width() && new_height == image.height())
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return false;
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int const xoffset_l = params.bb.xl;
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int const yoffset_t = (image.height() > int(params.bb.yt))
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? image.height() - params.bb.yt : 0;
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transformed_ = image.copy(xoffset_l, yoffset_t, new_width, new_height);
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return true;
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}
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bool GuiImage::rotate(Params const & params)
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{
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if (!params.angle)
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return false;
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QImage const & image = is_transformed_ ? transformed_ : original_;
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QMatrix m;
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m.rotate(- params.angle);
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transformed_ = image.transformed(m);
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return true;
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}
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bool GuiImage::scale(Params const & params)
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{
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QImage const & image = is_transformed_ ? transformed_ : original_;
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if (params.scale == 100)
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return false;
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qreal scale = qreal(params.scale) / 100.0;
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#if (QT_VERSION >= 0x040500) && (QT_VERSION <= 0x040502)
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// Due to a bug in Qt, LyX will crash for certain
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// scaling factors and sizes of the image.
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// see bug #5957: http://www.lyx.org/trac/ticket/5957
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scale += 0.0001;
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#endif
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QMatrix m;
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m.scale(scale, scale);
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transformed_ = image.transformed(m);
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return true;
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}
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} // namespace graphics
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} // lyx
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