content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.extensions.tabular.pdf.factory.internal;
  
  import org.apache.pdfbox.pdmodel.PDPageContentStream;
  import org.apache.pdfbox.pdmodel.font.PDFont;
  import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
  import org.apache.pdfbox.util.Matrix;
  
  import lombok.extern.log4j.Log4j2;
  
  import java.awt.Color;
  import java.io.IOException;
  import java.util.Arrays;
  
  @Log4j2
  final class PageContentStreamOptimized {
      private static final Matrix ROTATION = Matrix.getRotateInstance(Math.PI * 0.5, 0, 0);
  
      private final PDPageContentStream pageContentStream;
      private boolean textMode;
      private float textCursorAbsoluteX;
      private float textCursorAbsoluteY;
      private boolean rotated;
  
      public PageContentStreamOptimized(final PDPageContentStream pageContentStream) {
          this.pageContentStream = pageContentStream;
      }
  
      public void setRotated(final boolean rotated) throws IOException {
          if (this.rotated == rotated) return;
          if (rotated) {
              if (textMode) {
                  pageContentStream.setTextMatrix(ROTATION);
                  textCursorAbsoluteX = 0;
                  textCursorAbsoluteY = 0;
              }
          } else {
              endText();
          }
          this.rotated = rotated;
      }
  
      public void beginText() throws IOException {
          if (!textMode) {
              pageContentStream.beginText();
              if (rotated) {
                  pageContentStream.setTextMatrix(ROTATION);
              }
              textMode = true;
              textCursorAbsoluteX = 0;
              textCursorAbsoluteY = 0;
          }
      }
  
      public void endText() throws IOException {
          if (textMode) {
              pageContentStream.endText();
              textMode = false;
          }
      }
  
      private PDFont currentFont;
      private float currentFontSize;
  
      public void setFont(final PDFont font, final float fontSize) throws IOException {
          if (font != currentFont || fontSize != currentFontSize) {
              pageContentStream.setFont(font, fontSize);
              currentFont = font;
              currentFontSize = fontSize;
          }
      }
  
      public void showText(final String text) throws IOException {
          beginText();
          try {
              pageContentStream.showText(text);
          } catch (IllegalArgumentException e) {
              log.warn("cannot render text text '{}' -> {}", text, e.getMessage());
          }
      }
  
      public void newLineAt(final float tx, final float ty) throws IOException {
          beginText();
          float dx = tx - textCursorAbsoluteX;
          float dy = ty - textCursorAbsoluteY;
          if (rotated) {
              pageContentStream.newLineAtOffset(dy, -dx);
          } else {
              pageContentStream.newLineAtOffset(dx, dy);
          }
          textCursorAbsoluteX = tx;
          textCursorAbsoluteY = ty;
      }
  
      public void drawImage(final PDImageXObject image, final float x, final float y, final float width, final float height) throws IOException {
          endText();
          pageContentStream.drawImage(image, x, y, width, height);
      }
  
      private Color currentStrokingColor;
  
      public void setStrokingColor(final Color color) throws IOException {
          if (color != currentStrokingColor) {
              pageContentStream.setStrokingColor(color);
              currentStrokingColor = color;
          }
      }
  
      private Color currentNonStrokingColor;
  
      public void setNonStrokingColor(final Color color) throws IOException {
          if (color != currentNonStrokingColor) {
              pageContentStream.setNonStrokingColor(color);
              currentNonStrokingColor = color;
          }
      }
  
      public void addRect(final float x, final float y, final float width, final float height) throws IOException {
          endText();
          pageContentStream.addRect(x, y, width, height);
      }
  
      public void moveTo(final float x, final float y) throws IOException {
          endText();
          pageContentStream.moveTo(x, y);
      }
  
      public void lineTo(final float x, final float y) throws IOException {
          endText();
          pageContentStream.lineTo(x, y);
      }
  
      public void stroke() throws IOException {
          endText();
          pageContentStream.stroke();
      }
  
      public void fill() throws IOException {
          endText();
          pageContentStream.fill();
      }
  
      private float currentLineWidth = -1;
  
      public void setLineWidth(final float lineWidth) throws IOException {
          if (lineWidth != currentLineWidth) {
              endText();
              pageContentStream.setLineWidth(lineWidth);
              currentLineWidth = lineWidth;
          }
      }
  
      private int currentLineCapStyle = -1;
  
      public void setLineCapStyle(final int lineCapStyle) throws IOException {
          if (lineCapStyle != currentLineCapStyle) {
              endText();
              pageContentStream.setLineCapStyle(lineCapStyle);
              currentLineCapStyle = lineCapStyle;
          }
      }
  
      private float[] currentLineDashPattern;
      private float currentLineDashPhase;
  
      public void setLineDashPattern(final float[] pattern, final float phase) throws IOException {
          if ((pattern != currentLineDashPattern &&
              !Arrays.equals(pattern, currentLineDashPattern)) || phase != currentLineDashPhase) {
              endText();
              pageContentStream.setLineDashPattern(pattern, phase);
              currentLineDashPattern = pattern;
              currentLineDashPhase = phase;
          }
      }
  
      public void close() throws IOException {
          endText();
          pageContentStream.close();
      }
  }
  