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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date : 2005-02-14
+ * Description : a widget to insert a text over an image.
+ *
+ * Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
+ * Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * 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.
+ *
+ * ============================================================ */
+
+// C++ includes.
+
+#include <cstdio>
+#include <cmath>
+
+// Qt includes.
+
+#include <qpainter.h>
+#include <qfont.h>
+#include <qfontmetrics.h>
+
+// KDE includes.
+
+#include <kstandarddirs.h>
+#include <kcursor.h>
+#include <kglobal.h>
+
+// Digikam includes.
+
+#include "imageiface.h"
+
+// Local includes.
+
+#include "inserttextwidget.h"
+#include "inserttextwidget.moc"
+
+namespace DigikamInsertTextImagesPlugin
+{
+
+InsertTextWidget::InsertTextWidget(int w, int h, QWidget *parent)
+ : QWidget(parent, 0, Qt::WDestructiveClose)
+{
+ m_currentMoving = false;
+
+ m_iface = new Digikam::ImageIface(w, h);
+ m_data = m_iface->getPreviewImage();
+ m_w = m_iface->previewWidth();
+ m_h = m_iface->previewHeight();
+ m_pixmap = new QPixmap(w, h);
+ m_pixmap->fill(colorGroup().background());
+
+ setBackgroundMode(Qt::NoBackground);
+ setMinimumSize(w, h);
+ setMouseTracking(true);
+
+ m_rect = QRect(width()/2-m_w/2, height()/2-m_h/2, m_w, m_h);
+ m_textRect = QRect();
+
+ m_backgroundColor = QColor(0xCC, 0xCC, 0xCC);
+ m_transparency = 210;
+}
+
+InsertTextWidget::~InsertTextWidget()
+{
+ delete [] m_data;
+ delete m_iface;
+ delete m_pixmap;
+}
+
+Digikam::ImageIface* InsertTextWidget::imageIface()
+{
+ return m_iface;
+}
+
+void InsertTextWidget::resetEdit()
+{
+ // signal this needs to be filled by makePixmap
+ m_textRect = QRect();
+ makePixmap();
+ repaint(false);
+}
+
+void InsertTextWidget::setText(QString text, QFont font, QColor color, int alignMode,
+ bool border, bool transparent, int rotation)
+{
+ m_textString = text;
+ m_textColor = color;
+ m_textBorder = border;
+ m_textTransparent = transparent;
+ m_textRotation = rotation;
+
+ switch (alignMode)
+ {
+ case ALIGN_LEFT:
+ m_alignMode = Qt::AlignLeft;
+ break;
+
+ case ALIGN_RIGHT:
+ m_alignMode = Qt::AlignRight;
+ break;
+
+ case ALIGN_CENTER:
+ m_alignMode = Qt::AlignHCenter;
+ break;
+
+ case ALIGN_BLOCK:
+ m_alignMode = Qt::AlignJustify;
+ break;
+ }
+
+ // Center text if top left corner text area is not visible.
+
+ /*
+ if ( m_textFont.pointSize() != font.pointSize() &&
+ !rect().contains( m_textRect.x(), m_textRect.y() ) )
+ {
+ m_textFont = font;
+ resetEdit();
+ return;
+ }
+ */
+
+ m_textFont = font;
+
+ makePixmap();
+ repaint(false);
+}
+
+void InsertTextWidget::setPositionHint(QRect hint)
+{
+ // interpreted by composeImage
+ m_positionHint = hint;
+ if (m_textRect.isValid())
+ {
+ // invalidate current position so that hint is certainly interpreted
+ m_textRect = QRect();
+ makePixmap();
+ repaint();
+ }
+}
+
+QRect InsertTextWidget::getPositionHint()
+{
+ QRect hint;
+ if (m_textRect.isValid())
+ {
+ // We normalize on the size of the image, but we store as int. Precision loss is no problem.
+ hint.setX( (int) ((float)(m_textRect.x() - m_rect.x()) / (float)m_rect.width() * 10000.0) );
+ hint.setY( (int) ((float)(m_textRect.y() - m_rect.y()) / (float)m_rect.height() * 10000.0) );
+ hint.setWidth( (int) ((float)m_textRect.width() / (float)m_rect.width() * 10000.0) );
+ hint.setHeight( (int) ((float)m_textRect.height() / (float)m_rect.height() * 10000.0) );
+ }
+ return hint;
+}
+
+Digikam::DImg InsertTextWidget::makeInsertText(void)
+{
+ int orgW = m_iface->originalWidth();
+ int orgH = m_iface->originalHeight();
+ float ratioW = (float)orgW/(float)m_w;
+ float ratioH = (float)orgH/(float)m_h;
+
+ int x, y;
+ if (m_textRect.isValid())
+ {
+ // convert from widget to image coordinates, then to original size
+ x = lroundf( (m_textRect.x() - m_rect.x()) * ratioW);
+ y = lroundf( (m_textRect.y() - m_rect.y()) * ratioH);
+ }
+ else
+ {
+ x = -1;
+ y = -1;
+ }
+
+ // Get original image
+ Digikam::DImg image = m_iface->getOriginalImg()->copy();
+
+ int borderWidth = QMAX(1, lroundf(ratioW));
+ // compose and draw result on image
+ composeImage(&image, 0, x, y,
+ m_textFont, m_textFont.pointSizeFloat(),
+ m_textRotation, m_textColor, m_alignMode, m_textString,
+ m_textTransparent, m_backgroundColor,
+ m_textBorder ? BORDER_NORMAL : BORDER_NONE, borderWidth, borderWidth);
+
+ return image;
+}
+
+void InsertTextWidget::makePixmap(void)
+{
+ int orgW = m_iface->originalWidth();
+ int orgH = m_iface->originalHeight();
+ float ratioW = (float)m_w / (float)orgW;
+ float ratioH = (float)m_h / (float)orgH;
+
+ int x, y;
+ if (m_textRect.isValid())
+ {
+ // convert from widget to image coordinates
+ x = m_textRect.x() - m_rect.x();
+ y = m_textRect.y() - m_rect.y();
+ }
+ else
+ {
+ x = -1;
+ y = -1;
+ }
+
+ // get preview image data
+ uchar *data = m_iface->getPreviewImage();
+ Digikam::DImg image(m_iface->previewWidth(), m_iface->previewHeight(), m_iface->previewSixteenBit(),
+ m_iface->previewHasAlpha(), data);
+ delete [] data;
+
+ // paint pixmap for drawing this widget
+ // First, fill with background color
+ m_pixmap->fill(colorGroup().background());
+ QPainter p(m_pixmap);
+ // Convert image to pixmap and draw it
+ QPixmap imagePixmap = image.convertToPixmap();
+ p.drawPixmap(m_rect.x(), m_rect.y(),
+ imagePixmap, 0, 0, imagePixmap.width(), imagePixmap.height());
+
+ // prepare painter for use by compose image
+ p.setClipRect(m_rect);
+ p.translate(m_rect.x(), m_rect.y());
+
+ // compose image and draw result directly on pixmap, with correct offset
+ QRect textRect = composeImage(&image, &p, x, y,
+ m_textFont, m_textFont.pointSizeFloat() * ((ratioW > ratioH) ? ratioW : ratioH),
+ m_textRotation, m_textColor, m_alignMode, m_textString,
+ m_textTransparent, m_backgroundColor,
+ m_textBorder ? BORDER_NORMAL : BORDER_SUPPORT, 1, 1);
+
+ p.end();
+
+ // store new text rectangle
+ // convert from image to widget coordinates
+ m_textRect.setX(textRect.x() + m_rect.x());
+ m_textRect.setY(textRect.y() + m_rect.y());
+ m_textRect.setSize(textRect.size());
+}
+
+/*
+ Take data from image, draw text at x|y with specified parameters.
+ If destPainter is null, draw to image,
+ if destPainter is not null, draw directly using the painter.
+ Returns modified area of image.
+*/
+QRect InsertTextWidget::composeImage(Digikam::DImg *image, QPainter *destPainter,
+ int x, int y,
+ QFont font, float pointSize, int textRotation, QColor textColor,
+ int alignMode, const QString &textString,
+ bool transparentBackground, QColor backgroundColor,
+ BorderMode borderMode, int borderWidth, int spacing)
+{
+ /*
+ The problem we have to solve is that we have no pixel access to font rendering,
+ we have to let Qt do the drawing. On the other hand we need to support 16 bit, which
+ cannot be done with QPixmap.
+ The current solution cuts out the text area, lets Qt do its drawing, converts back and blits to original.
+ */
+ Digikam::DColorComposer *composer = Digikam::DColorComposer::getComposer(Digikam::DColorComposer::PorterDuffNone);
+
+ int maxWidth, maxHeight;
+ if (x == -1 && y == -1)
+ {
+ maxWidth = image->width();
+ maxHeight = image->height();
+ }
+ else
+ {
+ maxWidth = image->width() - x;
+ maxHeight = image->height() - y;
+ }
+
+ // find out size of the area that we are drawing to
+ font.setPointSizeFloat(pointSize);
+ QFontMetrics fontMt( font );
+ QRect fontRect = fontMt.boundingRect(0, 0, maxWidth, maxHeight, 0, textString);
+
+ int fontWidth, fontHeight;
+
+ switch(textRotation)
+ {
+ case ROTATION_NONE:
+ case ROTATION_180:
+ default:
+ fontWidth = fontRect.width();
+ fontHeight = fontRect.height();
+ break;
+
+ case ROTATION_90:
+ case ROTATION_270:
+ fontWidth = fontRect.height();
+ fontHeight = fontRect.width();
+ break;
+ }
+
+ // x, y == -1 means that we have to find a good initial position for the text here
+ if (x == -1 && y == -1)
+ {
+ // was a valid position hint stored from last use?
+ if (m_positionHint.isValid())
+ {
+ // We assume that people tend to orient text along the edges,
+ // so we do some guessing so that positions such as "in the lower right corner"
+ // will be remembered across different image sizes.
+
+ // get relative positions
+ float fromTop = (float)m_positionHint.top() / 10000.0;
+ float fromBottom = 1.0 - (float)m_positionHint.bottom() / 10000.0;
+ float fromLeft = (float)m_positionHint.left() / 10000.0;
+ float fromRight = 1.0 - (float)m_positionHint.right() / 10000.0;
+
+ // calculate horizontal position
+ if (fromLeft < fromRight)
+ {
+ x = (int)(fromLeft * maxWidth);
+
+ // we are placing from the smaller distance,
+ // so if now the larger distance is actually too small,
+ // fall back to standard placement, nothing to lose.
+ if (x + fontWidth > maxWidth)
+ x = QMAX( (maxWidth - fontWidth) / 2, 0);
+ }
+ else
+ {
+ x = maxWidth - (int)(fromRight * maxWidth) - fontWidth;
+ if ( x < 0 )
+ x = QMAX( (maxWidth - fontWidth) / 2, 0);
+ }
+
+ // calculate vertical position
+ if (fromTop < fromBottom)
+ {
+ y = (int)(fromTop * maxHeight);
+ if (y + fontHeight > maxHeight)
+ y = QMAX( (maxHeight - fontHeight) / 2, 0);
+ }
+ else
+ {
+ y = maxHeight - (int)(fromBottom * maxHeight) - fontHeight;
+ if ( y < 0 )
+ y = QMAX( (maxHeight - fontHeight) / 2, 0);
+ }
+
+ if (! QRect(x, y, fontWidth, fontHeight).
+ intersects(QRect(0, 0, maxWidth, maxHeight)) )
+ {
+ // emergency fallback - nothing is visible
+ x = QMAX( (maxWidth - fontWidth) / 2, 0);
+ y = QMAX( (maxHeight - fontHeight) / 2, 0);
+ }
+
+ // invalidate position hint, use only once
+ m_positionHint = QRect();
+ }
+ else
+ {
+ // use standard position
+ x = QMAX( (maxWidth - fontWidth) / 2, 0);
+ y = QMAX( (maxHeight - fontHeight) / 2, 0);
+ }
+ }
+
+ // create a rectangle relative to image
+ QRect drawRect( x, y, fontWidth + 2 * borderWidth + 2 * spacing, fontHeight + 2 * borderWidth + 2 * spacing);
+
+ // create a rectangle relative to textArea, excluding the border
+ QRect textAreaBackgroundRect( borderWidth, borderWidth, fontWidth + 2 * spacing, fontHeight + 2 * spacing);
+
+ // create a rectangle relative to textArea, excluding the border and spacing
+ QRect textAreaTextRect( borderWidth + spacing, borderWidth + spacing, fontWidth, fontHeight );
+
+ // create a rectangle relative to textArea, including the border,
+ // for drawing the rectangle, taking into account that the width of the QPen goes in and out in equal parts
+ QRect textAreaDrawRect( borderWidth / 2, borderWidth / 2, fontWidth + borderWidth + 2 * spacing,
+ fontHeight + borderWidth + 2 * spacing );
+
+ // cut out the text area
+ Digikam::DImg textArea = image->copy(drawRect);
+
+ if (textArea.isNull())
+ return QRect();
+
+ // compose semi-transparent background over textArea
+ if (transparentBackground)
+ {
+ Digikam::DImg transparentLayer(textAreaBackgroundRect.width(), textAreaBackgroundRect.height(), textArea.sixteenBit(), true);
+ Digikam::DColor transparent(backgroundColor);
+ transparent.setAlpha(m_transparency);
+ if (image->sixteenBit())
+ transparent.convertToSixteenBit();
+ transparentLayer.fill(transparent);
+ textArea.bitBlendImage(composer, &transparentLayer, 0, 0, transparentLayer.width(), transparentLayer.height(),
+ textAreaBackgroundRect.x(), textAreaBackgroundRect.y());
+ }
+
+ Digikam::DImg textNotDrawn;
+ if (textArea.sixteenBit())
+ {
+ textNotDrawn = textArea.copy();
+ textNotDrawn.convertToEightBit();
+ }
+ else
+ textNotDrawn = textArea;
+
+ // We have no direct pixel access to font rendering, so now we need to use Qt/X11 for the drawing
+
+ // convert text area to pixmap
+ QPixmap pixmap = textNotDrawn.convertToPixmap();
+ // paint on pixmap
+ QPainter p(&pixmap);
+ p.setPen( QPen(textColor, 1) ) ;
+ p.setFont( font );
+ p.save();
+
+ // translate to origin of text, leaving space for the border
+ p.translate(textAreaTextRect.x(), textAreaTextRect.y());
+
+ switch(textRotation)
+ {
+ case ROTATION_NONE:
+ p.drawText( 0, 0, textAreaTextRect.width(),
+ textAreaTextRect.height(), alignMode, textString );
+ break;
+ case ROTATION_90:
+ p.translate(textAreaTextRect.width(), 0);
+ p.rotate(90.0);
+ p.drawText( 0, 0, textAreaTextRect.height(), textAreaTextRect.width(),
+ alignMode, textString );
+ break;
+ case ROTATION_180:
+ p.translate(textAreaTextRect.width(), textAreaTextRect.height());
+ p.rotate(180.0);
+ p.drawText( 0, 0, textAreaTextRect.width(), textAreaTextRect.height(),
+ alignMode, textString );
+ break;
+ case ROTATION_270:
+ p.translate(0, textAreaTextRect.height());
+ p.rotate(270.0);
+ p.drawText( 0, 0, textAreaTextRect.height(), textAreaTextRect.width(),
+ alignMode, textString );
+ break;
+ }
+
+ p.restore();
+
+ // Drawing rectangle around text.
+
+ if (borderMode == BORDER_NORMAL) // Decorative border using text color.
+ {
+ p.setPen( QPen(textColor, borderWidth, Qt::SolidLine,
+ Qt::SquareCap, Qt::RoundJoin) ) ;
+ p.drawRect(textAreaDrawRect);
+ }
+ else if (borderMode == BORDER_SUPPORT) // Make simple dot line border to help user.
+ {
+ p.setPen(QPen(Qt::white, 1, Qt::SolidLine));
+ p.drawRect(textAreaDrawRect);
+ p.setPen(QPen(Qt::red, 1, Qt::DotLine));
+ p.drawRect(textAreaDrawRect);
+ }
+ p.end();
+
+ if (!destPainter)
+ {
+ // convert to QImage, then to DImg
+ QImage pixmapImage = pixmap.convertToImage();
+ Digikam::DImg textDrawn(pixmapImage.width(), pixmapImage.height(), false, true, pixmapImage.bits());
+
+ // This does not work: during the conversion, colors are altered significantly (diffs of 1 to 10 in each component),
+ // so we cannot find out which pixels have actually been touched.
+ /*
+ // Compare the result of drawing with the previous version.
+ // Set all unchanged pixels to transparent
+ Digikam::DColor color, ncolor;
+ uchar *ptr, *nptr;
+ ptr = textDrawn.bits();
+ nptr = textNotDrawn.bits();
+ int bytesDepth = textDrawn.bytesDepth();
+ int numPixels = textDrawn.width() * textDrawn.height();
+ for (int i = 0; i < numPixels; i++, ptr+= bytesDepth, nptr += bytesDepth)
+ {
+ color.setColor(ptr, false);
+ ncolor.setColor(nptr, false);
+ if ( color.red() == ncolor.red() &&
+ color.green() == ncolor.green() &&
+ color.blue() == ncolor.blue())
+ {
+ color.setAlpha(0);
+ color.setPixel(ptr);
+ }
+ }
+ // convert to 16 bit if needed
+ */
+ textDrawn.convertToDepthOfImage(&textArea);
+
+ // now compose to original: only pixels affected by drawing text and border are changed, not whole area
+ textArea.bitBlendImage(composer, &textDrawn, 0, 0, textDrawn.width(), textDrawn.height(), 0, 0);
+
+ // copy result to original image
+ image->bitBltImage(&textArea, drawRect.x(), drawRect.y());
+ }
+ else
+ {
+ destPainter->drawPixmap(drawRect.x(), drawRect.y(), pixmap, 0, 0, pixmap.width(), pixmap.height());
+ }
+
+ delete composer;
+
+ return drawRect;
+}
+
+void InsertTextWidget::paintEvent( QPaintEvent * )
+{
+ bitBlt(this, 0, 0, m_pixmap);
+}
+
+void InsertTextWidget::resizeEvent(QResizeEvent * e)
+{
+ blockSignals(true);
+ delete m_pixmap;
+
+ int w = e->size().width();
+ int h = e->size().height();
+
+ int textX = m_textRect.x() - m_rect.x();
+ int textY = m_textRect.y() - m_rect.y();
+ int old_w = m_w;
+ int old_h = m_h;
+ m_data = m_iface->setPreviewImageSize(w, h);
+ m_w = m_iface->previewWidth();
+ m_h = m_iface->previewHeight();
+
+ m_pixmap = new QPixmap(w, h);
+ m_rect = QRect(w/2-m_w/2, h/2-m_h/2, m_w, m_h);
+
+ if (m_textRect.isValid())
+ {
+ int textWidth = m_textRect.width();
+ int textHeight = m_textRect.height();
+
+ textX = lroundf( textX * (float)m_w / (float)old_w );
+ textY = lroundf( textY * (float)m_h / (float)old_h );
+ textWidth = lroundf(textWidth * (float)m_w / (float)old_w );
+ textHeight = lroundf(textHeight * (float)m_h / (float)old_h );
+
+ m_textRect.setX(textX + m_rect.x());
+ m_textRect.setY(textY + m_rect.y());
+ m_textRect.setWidth(textWidth);
+ m_textRect.setHeight(textHeight);
+ makePixmap();
+ }
+
+ blockSignals(false);
+}
+
+void InsertTextWidget::mousePressEvent ( QMouseEvent * e )
+{
+ if ( e->button() == Qt::LeftButton &&
+ m_textRect.contains( e->x(), e->y() ) )
+ {
+ m_xpos = e->x();
+ m_ypos = e->y();
+ setCursor ( KCursor::sizeAllCursor() );
+ m_currentMoving = true;
+ }
+}
+
+void InsertTextWidget::mouseReleaseEvent ( QMouseEvent * )
+{
+ setCursor ( KCursor::arrowCursor() );
+ m_currentMoving = false;
+}
+
+void InsertTextWidget::mouseMoveEvent ( QMouseEvent * e )
+{
+ if ( rect().contains( e->x(), e->y() ) )
+ {
+ if ( e->state() == Qt::LeftButton && m_currentMoving )
+ {
+ uint newxpos = e->x();
+ uint newypos = e->y();
+
+ m_textRect.moveBy(newxpos - m_xpos, newypos - m_ypos);
+
+ makePixmap();
+ repaint(false);
+
+ m_xpos = newxpos;
+ m_ypos = newypos;
+ setCursor( KCursor::handCursor() );
+ }
+ else if ( m_textRect.contains( e->x(), e->y() ) )
+ {
+ setCursor ( KCursor::sizeAllCursor() );
+ }
+ else
+ {
+ setCursor ( KCursor::arrowCursor() );
+ }
+ }
+}
+
+} // NameSpace DigikamInsertTextImagesPlugin
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