/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed 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 com.android.builder.png;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import com.android.annotations.NonNull;
import com.android.ide.common.res2.ResourcePreprocessor;
import com.android.ide.common.resources.configuration.DensityQualifier;
import com.android.ide.common.resources.configuration.FolderConfiguration;
import com.android.ide.common.resources.configuration.VersionQualifier;
import com.android.ide.common.vectordrawable.VdPreview;
import com.android.resources.Density;
import com.android.resources.ResourceFolderType;
import com.android.utils.ILogger;
import com.google.common.base.Charsets;
import com.google.common.collect.Lists;
import com.google.common.io.Files;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import javax.imageio.ImageIO;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
/**
* Generates PNG images (and XML copies) from VectorDrawable files.
*/
@SuppressWarnings("MethodMayBeStatic")
public class VectorDrawableRenderer implements ResourcePreprocessor {
/** Projects with minSdk set to this or higher don't need to generate PNGs. */
public static final int MIN_SDK_WITH_VECTOR_SUPPORT = 21;
private final ILogger mLogger;
private final File mOutputDir;
private final Collection<Density> mDensities;
public VectorDrawableRenderer(File outputDir, Collection<Density> densities, ILogger logger) {
mOutputDir = outputDir;
mDensities = densities;
mLogger = logger;
}
public Collection<File> createPngFiles(
@NonNull File inputXmlFile,
@NonNull File outputResDirectory,
@NonNull Collection<Density> densities) throws IOException {
throw new RuntimeException("Replaced by the new way to generate PNGs");
}
@Override
public boolean needsPreprocessing(File resourceFile) {
return isXml(resourceFile)
&& isInDrawable(resourceFile)
&& getEffectiveVersion(resourceFile) < MIN_SDK_WITH_VECTOR_SUPPORT
&& isRootVector(resourceFile);
}
@Override
public Collection<File> getFilesToBeGenerated(File inputXmlFile) {
FolderConfiguration originalConfiguration = getFolderConfiguration(inputXmlFile);
// Create all the PNG files and duplicate the XML into folders with the version qualifier.
Collection<File> filesToBeGenerated = Lists.newArrayList();
for (Density density : mDensities) {
FolderConfiguration newConfiguration = FolderConfiguration.copyOf(originalConfiguration);
newConfiguration.setDensityQualifier(new DensityQualifier(density));
File directory = new File(
mOutputDir,
newConfiguration.getFolderName(ResourceFolderType.DRAWABLE));
File pngFile = new File(
directory,
inputXmlFile.getName().replace(".xml", ".png"));
filesToBeGenerated.add(pngFile);
newConfiguration.setVersionQualifier(new VersionQualifier(MIN_SDK_WITH_VECTOR_SUPPORT));
File destination = new File(
mOutputDir,
newConfiguration.getFolderName(ResourceFolderType.DRAWABLE));
File xmlCopy = new File(destination, inputXmlFile.getName());
filesToBeGenerated.add(xmlCopy);
}
return filesToBeGenerated;
}
@Override
public void generateFile(File toBeGenerated, File original) throws IOException {
Files.createParentDirs(toBeGenerated);
if (isXml(toBeGenerated)) {
Files.copy(original, toBeGenerated);
} else {
mLogger.info(
"Generating PNG: [%s] from [%s]",
toBeGenerated.getAbsolutePath(),
original.getAbsolutePath());
FolderConfiguration folderConfiguration = getFolderConfiguration(toBeGenerated);
checkState(folderConfiguration.getDensityQualifier() != null);
Density density = folderConfiguration.getDensityQualifier().getValue();
String xmlContent = Files.toString(original, Charsets.UTF_8);
float scaleFactor = density.getDpiValue() / (float) Density.MEDIUM.getDpiValue();
if (scaleFactor <= 0) {
scaleFactor = 1.0f;
}
final VdPreview.TargetSize imageSize = VdPreview.TargetSize.createSizeFromScale(scaleFactor);
BufferedImage image = VdPreview.getPreviewFromVectorXml(imageSize, xmlContent, null);
checkState(image != null, "Generating the image failed.");
ImageIO.write(image, "png", toBeGenerated);
}
}
@NonNull
private FolderConfiguration getFolderConfiguration(@NonNull File inputXmlFile) {
String parentName = inputXmlFile.getParentFile().getName();
FolderConfiguration originalConfiguration =
FolderConfiguration.getConfigForFolder(parentName);
checkArgument(
originalConfiguration != null,
"Invalid resource folder name [%s].",
parentName);
return originalConfiguration;
}
private boolean isInDrawable(@NonNull File inputXmlFile) {
ResourceFolderType folderType =
ResourceFolderType.getFolderType(inputXmlFile.getParentFile().getName());
return folderType == ResourceFolderType.DRAWABLE;
}
/**
* Parse the root element of the file, return true if it is a vector.
* TODO: Combine this with the drawing code, such that we don't parse the file twice.
*/
private boolean isRootVector(File resourceFile) {
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
boolean result = false;
try {
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(resourceFile);
Element root = doc.getDocumentElement();
if (root != null && root.getNodeName().equalsIgnoreCase("vector")) {
result = true;
}
} catch (Exception e) {
mLogger.error(e, "Exception in parsing the XML resource" + e.getMessage());
}
return result;
}
private boolean isXml(File resourceFile) {
return resourceFile.getPath().endsWith(".xml");
}
private int getEffectiveVersion(File resourceFile) {
FolderConfiguration configuration = getFolderConfiguration(resourceFile);
if (configuration.getVersionQualifier() == null) {
configuration.createDefault();
}
//noinspection ConstantConditions - handled above.
return configuration.getVersionQualifier().getVersion();
}
}