* GuiImage:

- switch to QImage backend instead of QPixmap. In any case this was done internally by Qt for any image loading or transformation. This should relieve the X11 server a bit for big images.
- try to clear out the memory after a transformation by calling QImage::detach(). Unfortunately there seems to be a bug somewhere in Qt... see (http://bugzilla.lyx.org/show_bug.cgi?id=5002).

* GraphicsImage: get rid of scaledDimension()


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26455 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/GuiImage.cpp

@@ -23,7 +23,6 @@
 #include "support/lstrings.h"       // ascii_lowercase
 
 #include <QPainter>
-#include <QImage>
 #include <QImageReader>
 
 using namespace std;
@@ -39,9 +38,14 @@ Image * GuiImage::newImage()
 }
 
 
+GuiImage::GuiImage() : is_transformed_(false)
+{}
+
+
 GuiImage::GuiImage(GuiImage const & other)
 	: Image(other), original_(other.original_),
-	  transformed_(other.transformed_), is_transformed_(other.is_transformed_)
+	transformed_(other.transformed_), is_transformed_(other.is_transformed_),
+	fname_(other.fname_)
 {}
 
 
@@ -51,6 +55,12 @@ Image * GuiImage::clone() const
 }
 
 
+QImage const & GuiImage::image() const
+{
+	return is_transformed_ ? transformed_ : original_;
+}
+
+
 unsigned int GuiImage::width() const
 {
 	return is_transformed_ ? transformed_.width() : original_.width();
@@ -69,13 +79,18 @@ bool GuiImage::load(FileName const & filename)
 		LYXERR(Debug::GRAPHICS, "Image is loaded already!");
 		return false;
 	}
-
 	fname_ = toqstr(filename.absFilename());
+	return load();
+}
 
+
+bool GuiImage::load()
+{
 	if (!original_.load(fname_)) {
 		LYXERR(Debug::GRAPHICS, "Unable to open image");
 		return false;
 	}
+	original_.detach();
 	return true;
 }
 
@@ -86,7 +101,7 @@ bool GuiImage::setPixmap(Params const & params)
 		return false;
 
 	if (original_.isNull()) {
-		if (!original_.load(fname_))
+		if (!load())
 			return false;
 	}
 		
@@ -95,10 +110,13 @@ bool GuiImage::setPixmap(Params const & params)
 	is_transformed_ |= scale(params);
 
 	// Clear the pixmap to save some memory.
-	if (is_transformed_)
-		original_ = QPixmap();
-	else
-		transformed_ = QPixmap();
+	if (is_transformed_) {
+		original_.detach();
+		original_ = QImage();
+	} else {
+		transformed_.detach();
+		transformed_ = QImage();
+	}
 
 	return true;
 }
@@ -113,22 +131,23 @@ bool GuiImage::clip(Params const & params)
 	int const new_width  = params.bb.xr - params.bb.xl;
 	int const new_height = params.bb.yt - params.bb.yb;
 
+	QImage const & image = is_transformed_ ? transformed_ : original_;
+
 	// No need to check if the width, height are > 0 because the
 	// Bounding Box would be empty() in this case.
-	if (new_width > original_.width() || new_height > original_.height()) {
+	if (new_width > image.width() || new_height > image.height()) {
 		// Bounds are invalid.
 		return false;
 	}
 
-	if (new_width == original_.width() && new_height == original_.height())
+	if (new_width == image.width() && new_height == image.height())
 		return false;
 
 	int const xoffset_l = params.bb.xl;
-	int const yoffset_t = (original_.height() > int(params.bb.yt) ?
-			       original_.height() - params.bb.yt : 0);
+	int const yoffset_t = (image.height() > int(params.bb.yt))
+		? image.height() - params.bb.yt : 0;
 
-	transformed_ = original_.copy(xoffset_l, yoffset_t,
-				      new_width, new_height);
+	transformed_ = image.copy(xoffset_l, yoffset_t, new_width, new_height);
 	return true;
 }
 
@@ -138,30 +157,37 @@ bool GuiImage::rotate(Params const & params)
 	if (!params.angle)
 		return false;
 
-	if (!is_transformed_)
-		transformed_ = original_;
-
+	QImage const & image = is_transformed_ ? transformed_ : original_;
 	QMatrix m;
-	m.rotate(-params.angle);
-	transformed_ = transformed_.transformed(m);
+	m.rotate(- params.angle);
+	transformed_ = image.transformed(m);
 	return true;
 }
 
 
 bool GuiImage::scale(Params const & params)
 {
-	Dimension dim = scaledDimension(params);
+	QImage const & image = is_transformed_ ? transformed_ : original_;
 
-	if (dim.width() == width() && dim.height() == height())
+	unsigned int w = image.width();
+	unsigned int h = image.height();
+
+	// scale only when value > 0
+	if (params.scale > 0) {
+		w = (w * params.scale) / 100;
+		h = (h * params.scale) / 100;
+	}
+
+	LYXERR(Debug::GRAPHICS, "\n\tparams.scale  : " << params.scale
+		                 << "\n\twidth         : " << w
+		                 << "\n\theight        : " << h);
+
+	if (w == image.width() && h == image.height())
 		return false;
 	
-	if (!is_transformed_)
-		transformed_ = original_;
-
 	QMatrix m;
-	m.scale(double(dim.width()) / width(), double(dim.height()) / height());
-	transformed_ = transformed_.transformed(m);
-
+	m.scale(double(w) / image.width(), double(h) / image.height());
+	transformed_ = image.transformed(m);
 	return true;
 }
 

src/frontends/qt4/GuiImage.h

@@ -15,7 +15,7 @@
 
 #include "graphics/GraphicsImage.h"
 
-#include <QPixmap>
+#include <QImage>
 #include <QString>
 
 namespace lyx {
@@ -27,9 +27,8 @@ public:
 	/// Access to this class is through this static method.
 	static Image * newImage();
 
-	/// Retrieve the buffered pixmap.
-	QPixmap const & pixmap() const
-	{ return is_transformed_? transformed_ : original_; }
+	/// Retrieve the rendered image.
+	QImage const & image() const;
 
 private:
 	/// Create a copy
@@ -44,6 +43,7 @@ private:
 	 * Load the image file into memory.
 	 */
 	bool load(support::FileName const & filename);
+	bool load();
 	/**
 	 * Finishes the process of modifying transformed_, using
 	 * \c params to decide on color, grayscale etc.
@@ -59,16 +59,17 @@ private:
 	bool scale(Params const & params);
 
 	/// Access to the class is through newImage() and clone.
-	GuiImage() {}
+	GuiImage();
 	///
 	GuiImage(GuiImage const &);
 
 	/// The original loaded image.
-	QPixmap original_;
+	QImage original_;
 
 	/// The transformed image for display.
-	QPixmap transformed_;
-	/// Buffer the pixmap itself
+	QImage transformed_;
+
+	///
 	bool is_transformed_;
 	///
 	QString fname_;

src/frontends/qt4/GuiPainter.cpp

@@ -263,7 +263,7 @@ void GuiPainter::image(int x, int y, int w, int h, graphics::Image const & i)
 	if (!isDrawingEnabled())
 		return;
 
-	drawPixmap(x, y, qlimage.pixmap(), 0, 0, w, h);
+	drawImage(x, y, qlimage.image(), 0, 0, w, h);
 }
 
 

src/graphics/GraphicsImage.cpp

@@ -25,23 +25,5 @@ namespace graphics {
 // instance of a viable derived class.
 boost::function<Image *()> Image::newImage;
 
-Dimension Image::scaledDimension(Params const & params) const
-{
-	// scale only when value > 0
-	unsigned int w = width();
-	unsigned int h = height();
-	if (params.scale) {
-		w = (w * params.scale) / 100;
-		h = (h * params.scale) / 100;
-	}
-
-	LYXERR(Debug::GRAPHICS, "graphics::Image::getScaledDimensions()"
-		<< "\n\tparams.scale       : " << params.scale
-		<< "\n\twidth              : " << w
-		<< "\n\theight             : " << h);
-
-	return Dimension(w, h, 0);
-}
-
 } // namespace graphics
 } // namespace lyx

src/graphics/GraphicsImage.h

@@ -85,12 +85,6 @@ protected:
 	Image() {}
 	/// Don't copy the signal finishedLoading
 	Image(Image const &) {}
-
-	/** Uses the params to ascertain the dimensions of the scaled image.
-	 *  Returned as Dimension(width, height, 0 descend).
-	 *  If something goes wrong, returns make_pair(getWidth(), getHeight(), 0)
-	 */
-	Dimension scaledDimension(Params const & params) const;
 };