Store and use QImage rather than QPixmap.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8720 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt2/ChangeLog

@@ -1,3 +1,11 @@
+2004-05-02  Angus Leeming  <leeming@lyx.org>
+
+	* QLImage.[Ch]: store and use QImage rather than QPixmap. Saves
+	a heap of transformations to/from QImage when manipulating the
+	data.
+
+	* QLPainter.C (image): access QLImage::qimage rather than ::qpixmap.
+
 2004-05-02  Angus Leeming  <leeming@lyx.org>
 
 	* QLPainter.C (image): set the background colour to

src/frontends/qt2/QLImage.C

@@ -102,10 +102,9 @@ QLImage::QLImage()
 
 
 QLImage::QLImage(QLImage const & other)
-	: Image(other), pixmap_(other.pixmap_),
-	  xformed_pixmap_(other.pixmap_)
-{
-}
+	: Image(other), original_(other.original_),
+	  transformed_(other.original_)
+{}
 
 
 QLImage::~QLImage()
@@ -121,32 +120,32 @@ Image * QLImage::clone_impl() const
 
 unsigned int QLImage::getWidth_impl() const
 {
-	return xformed_pixmap_.width();
+	return transformed_.width();
 }
 
 
 unsigned int QLImage::getHeight_impl() const
 {
-	return xformed_pixmap_.height();
+	return transformed_.height();
 }
 
 
 void QLImage::load_impl(string const & filename)
 {
-	if (!pixmap_.isNull()) {
+	if (!original_.isNull()) {
 		lyxerr[Debug::GRAPHICS]
 			<< "Image is loaded already!" << endl;
 		finishedLoading(false);
 		return;
 	}
 
-	if (!pixmap_.load(toqstr(filename))) {
+	if (!original_.load(toqstr(filename))) {
 		lyxerr[Debug::GRAPHICS]
 			<< "Unable to open image" << endl;
 		finishedLoading(false);
 		return;
 	}
-	xformed_pixmap_ = pixmap_;
+	transformed_ = original_;
 	finishedLoading(true);
 }
 
@@ -178,19 +177,17 @@ QImage & toGray(QImage & img)
 
 bool QLImage::setPixmap_impl(Params const & params)
 {
-	if (pixmap_.isNull() || params.display == NoDisplay)
+	if (original_.isNull() || params.display == NoDisplay)
 		return false;
 
 	switch (params.display) {
 	case GrayscaleDisplay: {
-		QImage i(xformed_pixmap_.convertToImage());
-		xformed_pixmap_.convertFromImage(toGray(i));
+		toGray(transformed_);
 		break;
 	}
 
 	case MonochromeDisplay: {
-			QImage i(xformed_pixmap_.convertToImage());
-			xformed_pixmap_.convertFromImage(i, QPixmap::Mono);
+		transformed_.convertDepth(transformed_.depth(), Qt::MonoOnly);
 		break;
 	}
 
@@ -204,7 +201,7 @@ bool QLImage::setPixmap_impl(Params const & params)
 
 void QLImage::clip_impl(Params const & params)
 {
-	if (xformed_pixmap_.isNull())
+	if (transformed_.isNull())
 		return;
 
 	if (params.bb.empty())
@@ -216,46 +213,42 @@ void QLImage::clip_impl(Params const & params)
 
 	// No need to check if the width, height are > 0 because the
 	// Bounding Box would be empty() in this case.
-	if (new_width > pixmap_.width() || new_height > pixmap_.height()) {
+	if (new_width > original_.width() || new_height > original_.height()) {
 		// Bounds are invalid.
 		return;
 	}
 
-	if (new_width == pixmap_.width() && new_height == pixmap_.height())
+	if (new_width == original_.width() && new_height == original_.height())
 		return;
 
 	int const xoffset_l = params.bb.xl;
-	int const yoffset_t = (pixmap_.height() > int(params.bb.yt) ?
-				pixmap_.height() - params.bb.yt : 0);
+	int const yoffset_t = (original_.height() > int(params.bb.yt) ?
+			       original_.height() - params.bb.yt : 0);
 
-	xformed_pixmap_.resize(new_width, new_height);
-	QPainter p;
-	p.begin(&xformed_pixmap_);
-	p.drawPixmap(0, 0, pixmap_, xoffset_l, yoffset_t, new_width, new_height);
-	p.end();
+	transformed_ = original_.copy(xoffset_l, yoffset_t,
+				      new_width, new_height);
 }
 
 
 void QLImage::rotate_impl(Params const & params)
 {
-	if (xformed_pixmap_.isNull())
+	if (transformed_.isNull())
 		return;
 
 	if (!params.angle)
 		return;
 
-	// The angle passed to flimage_rotate is the angle in one-tenth of a
-	// degree units.
-
 	QWMatrix m;
 	m.rotate(-params.angle);
-	xformed_pixmap_ = xformed_pixmap_.xForm(m);
+
+	transformed_.setAlphaBuffer(true);
+	transformed_ = transformed_.xForm(m);
 }
 
 
 void QLImage::scale_impl(Params const & params)
 {
-	if (xformed_pixmap_.isNull())
+	if (transformed_.isNull())
 		return;
 
 	unsigned int width;
@@ -267,7 +260,7 @@ void QLImage::scale_impl(Params const & params)
 
 	QWMatrix m;
 	m.scale(double(width) / getWidth(), double(height) / getHeight());
-	xformed_pixmap_ = xformed_pixmap_.xForm(m);
+	transformed_ = transformed_.xForm(m);
 }
 
 } // namespace graphics

src/frontends/qt2/QLImage.h

@@ -16,7 +16,7 @@
 
 #include "graphics/GraphicsImage.h"
 
-#include <qpixmap.h>
+#include <qimage.h>
 
 namespace lyx {
 namespace graphics {
@@ -30,7 +30,7 @@ public:
 	static FormatList loadableFormats();
 
 	~QLImage();
-	QPixmap const & qpixmap() const { return xformed_pixmap_; }
+	QImage const & qimage() const { return transformed_; }
 
 private:
 	/// Create a copy
@@ -48,10 +48,9 @@ private:
 	 */
 	virtual void load_impl(std::string const & filename);
 	/**
-	 * Generate the pixmap, based on the current state of
-	 * image_ (clipped, rotated, scaled etc).
-	 * Uses the params to decide on color, grayscale etc.
-	 * Returns true if the pixmap is created.
+	 * Finishes the process of modifying transformed_, using
+	 * \c params to decide on color, grayscale etc.
+	 * \returns true if successful.
 	 */
 	virtual bool setPixmap_impl(Params const & params);
 	/// Clip the image using params.
@@ -66,11 +65,11 @@ private:
 	///
 	QLImage(QLImage const &);
 
-	/// the original loaded image
-	QPixmap pixmap_;
+	/// The original loaded image.
+	QImage original_;
 
-	/// the transformed pixmap for display
-	QPixmap xformed_pixmap_;
+	/// The transformed image for display.
+	QImage transformed_;
 };
 
 } // namespace graphics

src/frontends/qt2/QLPainter.C

@@ -170,7 +170,7 @@ void QLPainter::image(int x, int y, int w, int h,
 		static_cast<lyx::graphics::QLImage const &>(i);
 
 	fillRectangle(x, y, w, h, LColor::graphicsbg);
-	qp_->drawPixmap(x, y, qlimage.qpixmap(), 0, 0, w, h);
+	qp_->drawImage(x, y, qlimage.qimage(), 0, 0, w, h);
 }