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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.layout.renderer.objectfit;
import com.itextpdf.layout.properties.ObjectFit;
/**
* Utility class which supports the {@link ObjectFit} property.
*/
public final class ObjectFitCalculator {
private ObjectFitCalculator() {}
/**
* Calculates size of image to be render when certain {@link ObjectFit} mode is
* applied. The width or the height of the image might be greater than the same
* property of the image in a document. In this case parts of the image will not
* be shown.
*
* @param objectFit is an object-fit mode
* @param absoluteImageWidth is a width of the original image
* @param absoluteImageHeight is a height of the original image
* @param imageContainerWidth is a width of the image to draw
* @param imageContainerHeight is a width of the image to draw
* @return results of object-fit mode applying as an {@link ObjectFitApplyingResult} object
*/
public static ObjectFitApplyingResult calculateRenderedImageSize(ObjectFit objectFit,
double absoluteImageWidth, double absoluteImageHeight, double imageContainerWidth,
double imageContainerHeight) {
switch (objectFit) {
case FILL:
return processFill(imageContainerWidth, imageContainerHeight);
case CONTAIN:
return processContain(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight);
case COVER:
return processCover(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight);
case SCALE_DOWN:
return processScaleDown(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight);
case NONE:
return processNone(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight);
default:
throw new IllegalArgumentException("Object fit parameter cannot be null!");
}
}
private static ObjectFitApplyingResult processFill(double imageContainerWidth,
double imageContainerHeight) {
return new ObjectFitApplyingResult(imageContainerWidth, imageContainerHeight, false);
}
private static ObjectFitApplyingResult processContain(double absoluteImageWidth,
double absoluteImageHeight, double imageContainerWidth, double imageContainerHeight) {
return processToFitSide(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight, false);
}
private static ObjectFitApplyingResult processCover(double absoluteImageWidth,
double absoluteImageHeight, double imageContainerWidth, double imageContainerHeight) {
return processToFitSide(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight, true);
}
private static ObjectFitApplyingResult processScaleDown(double absoluteImageWidth,
double absoluteImageHeight, double imageContainerWidth, double imageContainerHeight) {
if (imageContainerWidth >= absoluteImageWidth &&
imageContainerHeight >= absoluteImageHeight) {
return new ObjectFitApplyingResult(absoluteImageWidth, absoluteImageHeight, false);
} else {
return processToFitSide(absoluteImageWidth, absoluteImageHeight, imageContainerWidth,
imageContainerHeight, false);
}
}
private static ObjectFitApplyingResult processNone(double absoluteImageWidth,
double absoluteImageHeight, double imageContainerWidth, double imageContainerHeight) {
final boolean doesObjectFitRequireCutting = imageContainerWidth <= absoluteImageWidth ||
imageContainerHeight <= absoluteImageHeight;
return new ObjectFitApplyingResult(absoluteImageWidth, absoluteImageHeight,
doesObjectFitRequireCutting);
}
private static ObjectFitApplyingResult processToFitSide(double absoluteImageWidth,
double absoluteImageHeight, double imageContainerWidth, double imageContainerHeight,
boolean clipToFit) {
final double widthCoeff = imageContainerWidth / absoluteImageWidth;
final double heightCoeff = imageContainerHeight / absoluteImageHeight;
double renderedImageWidth;
double renderedImageHeight;
final boolean isWidthFitted = heightCoeff > widthCoeff ^ clipToFit;
if (isWidthFitted) {
renderedImageWidth = imageContainerWidth;
renderedImageHeight = absoluteImageHeight * imageContainerWidth / absoluteImageWidth;
} else {
renderedImageHeight = imageContainerHeight;
renderedImageWidth = absoluteImageWidth * imageContainerHeight / absoluteImageHeight;
}
return new ObjectFitApplyingResult(renderedImageWidth, renderedImageHeight, clipToFit);
}
}
