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Improve image thumbnails generation.

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This commit is contained in:
Igor Kulikov 2024-09-25 16:08:45 +03:00
parent 9bbaab7221
commit 76abeb1ead
3 changed files with 93 additions and 93 deletions
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8
dao/pom.xml
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@ -246,12 +246,8 @@
<artifactId>hypersistence-utils-hibernate-63</artifactId>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-transcoder</artifactId>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-codec</artifactId>
<groupId>com.github.weisj</groupId>
<artifactId>jsvg</artifactId>
</dependency>
<dependency>
<groupId>com.drewnoakes</groupId>

159
dao/src/main/java/org/thingsboard/server/dao/util/ImageUtils.java
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@ -21,37 +21,36 @@ import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.github.weisj.jsvg.SVGDocument;
import com.github.weisj.jsvg.attributes.ViewBox;
import com.github.weisj.jsvg.geometry.size.FloatSize;
import com.github.weisj.jsvg.parser.DefaultParserProvider;
import com.github.weisj.jsvg.parser.LoaderContext;
import com.github.weisj.jsvg.parser.SVGLoader;
import lombok.AccessLevel;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.With;
import lombok.extern.slf4j.Slf4j;
import org.apache.batik.anim.dom.SAXSVGDocumentFactory;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.DocumentLoader;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.bridge.UserAgent;
import org.apache.batik.bridge.UserAgentAdapter;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.batik.util.XMLResourceDescriptor;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
import org.thingsboard.common.util.JacksonUtil;
import org.thingsboard.server.common.data.StringUtils;
import org.w3c.dom.Document;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import java.awt.Color;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Map;
import java.util.regex.Pattern;
@NoArgsConstructor(access = AccessLevel.PRIVATE)
@Slf4j
@ -144,52 +143,32 @@ public class ImageUtils {
BufferedImage thumbnail = new BufferedImage(preview.getWidth(), preview.getHeight(), BufferedImage.TYPE_INT_ARGB);
thumbnail.getGraphics().drawImage(bufferedImage, 0, 0, preview.getWidth(), preview.getHeight(), null);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(thumbnail, "png", out);
byte[] pngThumbnail = toCompressedPngData(thumbnail);
preview.setMediaType("image/png");
preview.setData(out.toByteArray());
preview.setSize(preview.getData().length);
preview.setData(pngThumbnail);
preview.setSize(pngThumbnail.length);
image.setPreview(preview);
return image;
}
public static ProcessedImage processSvgImage(byte[] data, String mediaType, int thumbnailMaxDimension) throws Exception {
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(XMLResourceDescriptor.getXMLParserClassName());
Document document = factory.createDocument(null, new ByteArrayInputStream(data));
var imageData = removeScadaSymbolMetadata(data);
SVGLoader loader = new SVGLoader();
SVGDocument svgDocument = loader.load(new ByteArrayInputStream(imageData), null, LoaderContext.builder()
.parserProvider(new DefaultParserProvider())
.build());
Integer width = null;
Integer height = null;
String strWidth = document.getDocumentElement().getAttribute("width");
String strHeight = document.getDocumentElement().getAttribute("height");
if (StringUtils.isNotEmpty(strWidth) && StringUtils.isNotEmpty(strHeight)) {
try {
width = (int) Double.parseDouble(strWidth);
height = (int) Double.parseDouble(strHeight);
} catch (NumberFormatException ignored) {} // in case width and height are in %, mm, etc.
}
if (width == null || height == null) {
String viewBox = document.getDocumentElement().getAttribute("viewBox");
if (StringUtils.isNotEmpty(viewBox)) {
String[] viewBoxValues = viewBox.split(" ");
if (viewBoxValues.length > 3) {
width = (int) Double.parseDouble(viewBoxValues[2]);
height = (int) Double.parseDouble(viewBoxValues[3]);
}
}
}
if (width == null) {
UserAgent agent = new UserAgentAdapter();
DocumentLoader loader = new DocumentLoader(agent);
BridgeContext context = new BridgeContext(agent, loader);
context.setDynamic(true);
GVTBuilder builder = new GVTBuilder();
GraphicsNode root = builder.build(context, document);
var bounds = root.getPrimitiveBounds();
if (bounds != null) {
width = (int) bounds.getWidth();
height = (int) bounds.getHeight();
}
if (svgDocument != null) {
FloatSize imageSize = svgDocument.size();
width = (int) imageSize.width;
height = (int) imageSize.height;
}
ProcessedImage image = new ProcessedImage();
image.setMediaType(mediaType);
image.setWidth(width == null ? 0 : width);
@ -197,26 +176,28 @@ public class ImageUtils {
image.setData(data);
image.setSize(data.length);
PNGTranscoder transcoder = new PNGTranscoder();
if (image.getSize() < 10240) { // if SVG is smaller than 10kB (average 250x250 PNG preview size)
return withPreviewAsOriginalImage(image);
if (imageData.length < 10240 || svgDocument == null) { // if SVG is smaller than 10kB (average 250x250 PNG preview size)
return withPreviewAsOriginalImage(image, imageData);
} else if (image.getSize() > 102400 && image.getWidth() != 0) { // considering SVG image detailed after 100kB
// increasing preview dimensions
thumbnailMaxDimension = 512;
int[] thumbnailDimensions = getThumbnailDimensions(image.getWidth(), image.getHeight(), thumbnailMaxDimension, false);
transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, (float) thumbnailDimensions[0]);
transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, (float) thumbnailDimensions[1]);
} else {
transcoder.addTranscodingHint(PNGTranscoder.KEY_MAX_WIDTH, (float) thumbnailMaxDimension);
transcoder.addTranscodingHint(PNGTranscoder.KEY_MAX_HEIGHT, (float) thumbnailMaxDimension);
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
transcoder.transcode(new TranscoderInput(new ByteArrayInputStream(data)), new TranscoderOutput(out));
byte[] pngThumbnail = out.toByteArray();
ProcessedImage preview = new ProcessedImage();
preview.setWidth(thumbnailMaxDimension);
preview.setHeight(thumbnailMaxDimension);
int[] thumbnailDimensions = getThumbnailDimensions(image.getWidth(), image.getHeight(), thumbnailMaxDimension, false);
preview.setWidth(thumbnailDimensions[0]);
preview.setHeight(thumbnailDimensions[1]);
BufferedImage thumbnail = new BufferedImage(preview.getWidth(), preview.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = thumbnail.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
svgDocument.render((Component)null,graphics, new ViewBox(0, 0, preview.getWidth(), preview.getHeight()));
graphics.dispose();
byte[] pngThumbnail = toCompressedPngData(thumbnail);
if (imageData.length < pngThumbnail.length) { // set preview as original SVG if PNG thumbnail size is greater
return withPreviewAsOriginalImage(image, imageData);
}
preview.setMediaType("image/png");
preview.setData(pngThumbnail);
preview.setSize(pngThumbnail.length);
@ -224,6 +205,27 @@ public class ImageUtils {
return image;
}
public static byte[] toCompressedPngData(BufferedImage image) throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageTypeSpecifier type = ImageTypeSpecifier.createFromRenderedImage(image);
ImageWriter writer = ImageIO.getImageWriters(type, "png").next();
ImageWriteParam param = writer.getDefaultWriteParam();
if (param.canWriteCompressed()) {
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(0.0f);
}
var output = ImageIO.createImageOutputStream(out);
writer.setOutput(output);
try {
writer.write(null, new IIOImage(image, null, null), param);
} finally {
writer.dispose();
output.flush();
}
return out.toByteArray();
}
private static ProcessedImage previewAsOriginalImage(byte[] data, String mediaType) {
ProcessedImage image = new ProcessedImage();
image.setMediaType(mediaType);
@ -235,21 +237,34 @@ public class ImageUtils {
}
public static ProcessedImage withPreviewAsOriginalImage(ProcessedImage originalImage) {
originalImage.setPreview(originalImage.withData(null));
return withPreviewAsOriginalImage(originalImage, null);
}
public static ProcessedImage withPreviewAsOriginalImage(ProcessedImage originalImage, byte[] previewData) {
originalImage.setPreview(originalImage.withData(previewData));
if (previewData != null) {
originalImage.getPreview().setSize(previewData.length);
}
return originalImage;
}
public static ScadaSymbolMetadataInfo processScadaSymbolMetadata(String fileName, byte[] data) throws Exception {
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(XMLResourceDescriptor.getXMLParserClassName());
Document document = factory.createDocument(null, new ByteArrayInputStream(data));
var metaElements = document.getElementsByTagName("tb:metadata");
JsonNode metaData = null;
if (metaElements.getLength() > 0) {
metaData = JacksonUtil.toJsonNode(metaElements.item(0).getTextContent());
String contents = new String(data, StandardCharsets.UTF_8);
var matcher = Pattern.compile("(?s)<tb:metadata[^>]*><!\\[CDATA\\[(.*)]]><\\/tb:metadata>").matcher(contents);
if (matcher.find()) {
var metadataContent = matcher.group(1);
metaData = JacksonUtil.toJsonNode(metadataContent);
}
return new ScadaSymbolMetadataInfo(fileName, metaData);
}
public static byte[] removeScadaSymbolMetadata(byte[] data) {
String contents = new String(data, StandardCharsets.UTF_8);
contents = contents.replaceFirst("(?s)<tb:metadata[^>]*>.*<\\/tb:metadata>", "");
return contents.getBytes(StandardCharsets.UTF_8);
}
private static int[] getThumbnailDimensions(int originalWidth, int originalHeight, int maxDimension, boolean originalIfSmaller) {
if (originalWidth <= maxDimension && originalHeight <= maxDimension && originalIfSmaller) {
return new int[]{originalWidth, originalHeight};

19
pom.xml
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@ -163,7 +163,7 @@
<slack-api.version>1.39.0</slack-api.version>
<oshi.version>6.6.0</oshi.version>
<google-oauth-client.version>1.35.0</google-oauth-client.version>
<apache-xmlgraphics.version>1.17</apache-xmlgraphics.version>
<weisj-jsvg.version>1.6.1</weisj-jsvg.version>
<drewnoakes-metadata-extractor.version>2.19.0</drewnoakes-metadata-extractor.version>
<firebase-admin.version>9.2.0</firebase-admin.version>
</properties>
@ -2262,20 +2262,9 @@
<version>${google-oauth-client.version}</version>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-transcoder</artifactId>
<version>${apache-xmlgraphics.version}</version>
<exclusions>
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-codec</artifactId>
<version>${apache-xmlgraphics.version}</version>
<groupId>com.github.weisj</groupId>
<artifactId>jsvg</artifactId>
<version>${weisj-jsvg.version}</version>
</dependency>
<dependency>
<groupId>com.drewnoakes</groupId>