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com.google.gwt.resources.rg.ImageResourceGenerator Maven / Gradle / Ivy
/*
* Copyright 2008 Google Inc.
*
* 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.google.gwt.resources.rg;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.dev.util.StringKey;
import com.google.gwt.dev.util.Util;
import com.google.gwt.dev.util.collect.Maps;
import com.google.gwt.dev.util.collect.Sets;
import com.google.gwt.resources.client.ImageResource.ImageOptions;
import com.google.gwt.resources.client.ImageResource.RepeatStyle;
import com.google.gwt.resources.client.impl.ImageResourcePrototype;
import com.google.gwt.resources.ext.AbstractResourceGenerator;
import com.google.gwt.resources.ext.ClientBundleFields;
import com.google.gwt.resources.ext.ClientBundleRequirements;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import com.google.gwt.resources.ext.SupportsGeneratorResultCaching;
import com.google.gwt.resources.rg.ImageBundleBuilder.Arranger;
import com.google.gwt.resources.rg.ImageBundleBuilder.ImageRect;
import com.google.gwt.safehtml.shared.UriUtils;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;
import com.google.gwt.util.tools.Utility;
import java.awt.geom.AffineTransform;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
/**
* Builds an image strip for all ImageResources defined within an ClientBundle.
*/
public final class ImageResourceGenerator extends AbstractResourceGenerator
implements SupportsGeneratorResultCaching {
/**
* Represents a file that contains multiple image regions.
*/
static class BundledImage extends DisplayedImage {
private static final String MIME_TYPE_IMAGE_PNG = "image/png";
private final ImageBundleBuilder builder;
private boolean dirty = false;
private Map images;
private Set rtlImages = Sets.create();
private Map localizedByImageResource;
private String normalContentsUrlExpression;
private String rtlContentsUrlExpression;
public BundledImage() {
builder = new ImageBundleBuilder();
images = Maps.create();
localizedByImageResource = Maps.create();
}
@Override
public Class getResourceType() {
return ImageResourcePrototype.Bundle.class;
}
public LocalizedImage addImage(TreeLogger logger, ResourceContext context,
ImageResourceDeclaration image) throws UnableToCompleteException,
CannotBundleImageException {
LocalizedImage localized = LocalizedImage.create(logger, context, image);
localizedByImageResource = Maps.put(localizedByImageResource, image, localized);
if (images.containsKey(localized)) {
return localized;
}
dirty = true;
ImageRect rect = null;
try {
rect = builder.assimilate(logger, image.get(), localized.getUrl());
if (context.supportsDataUrls()) {
// Treat the image as though it were external
builder.removeMapping(image.get());
throw new CannotBundleImageException(localized, rect);
}
images = Maps.put(images, localized, rect);
} catch (UnsuitableForStripException e) {
rect = e.getImageRect();
throw new CannotBundleImageException(localized, rect);
} finally {
if (rect != null) {
rect.setHeight(image.getScaleHeight());
rect.setWidth(image.getScaleWidth());
}
}
assert rect != null : "No ImageRect";
return localized;
}
public ImageBundleBuilder getImageBundleBuilder() {
return builder;
}
@Override
public ImageRect getImageRect(ImageResourceDeclaration image) {
return images.get(localizedByImageResource.get(image));
}
@Override
public void render(TreeLogger logger, ResourceContext context,
ClientBundleFields fields, RepeatStyle repeatStyle)
throws UnableToCompleteException {
if (builder.getImageCount() == 0) {
// No data
return;
}
if (dirty) {
Arranger arranger;
switch (repeatStyle) {
case None:
arranger = new ImageBundleBuilder.BestFitArranger();
break;
case Horizontal:
arranger = new ImageBundleBuilder.VerticalArranger();
break;
case Vertical:
arranger = new ImageBundleBuilder.HorizontalArranger();
break;
case Both:
arranger = new ImageBundleBuilder.IdentityArranger();
break;
default:
logger.log(TreeLogger.ERROR, "Unknown RepeatStyle " + repeatStyle);
throw new UnableToCompleteException();
}
URL normalContents = renderToTempPngFile(logger, builder, arranger);
normalContentsUrlExpression = context.deploy(normalContents, MIME_TYPE_IMAGE_PNG, false);
if (!rtlImages.isEmpty()) {
for (LocalizedImage rtlImage : rtlImages) {
// Create a transformation to mirror about the Y-axis and translate
AffineTransform tx = new AffineTransform();
ImageRect imageRect = images.get(rtlImage);
tx.setTransform(-1, 0, 0, 1, imageRect.getWidth(), 0);
imageRect.setTransform(tx);
}
URL rtlContents =
renderToTempPngFile(logger, builder, new ImageBundleBuilder.IdentityArranger());
assert rtlContents != null;
rtlContentsUrlExpression = context.deploy(rtlContents, MIME_TYPE_IMAGE_PNG, false);
}
dirty = false;
if (logger.isLoggable(TreeLogger.DEBUG)) {
logger.log(TreeLogger.DEBUG, "Composited " + builder.getImageCount() + " images");
}
}
JClassType stringType =
context.getGeneratorContext().getTypeOracle().findType(String.class.getCanonicalName());
// Create the field that holds the normal contents
assert normalContentsUrlExpression != null;
normalContentsFieldName = fields.define(stringType, "bundledImage_"
+ repeatStyle.name(), normalContentsUrlExpression, true, true);
// Optionally create the field that holds the RTL contents
if (rtlContentsUrlExpression != null) {
rtlContentsFieldName = fields.define(stringType, "bundledImage_"
+ repeatStyle.name() + "_rtl", rtlContentsUrlExpression, true, true);
}
}
@Override
public void setRtlImage(LocalizedImage image) {
rtlImages = Sets.add(rtlImages, image);
}
}
/**
* This key is used to determine which DisplayedImage a given set of image
* bytes should be associated with.
*/
static class BundleKey extends StringKey {
private static String key(ImageResourceDeclaration image, boolean isExternal) {
if (isExternal) {
return "External: " + image.get();
}
// test mirrored in prepare(), make sure to keep them in sync
if (image.isPreventInlining() || image.getRepeatStyle() == RepeatStyle.Both) {
return "Unbundled: " + image.get();
}
return "Arranged: " + image.getRepeatStyle().toString();
}
private final RepeatStyle repeatStyle;
public BundleKey(ImageResourceDeclaration image, boolean isExternal) {
super(key(image, isExternal));
this.repeatStyle = image.getRepeatStyle();
}
public RepeatStyle getRepeatStyle() {
return repeatStyle;
}
public boolean isExternal() {
return get().startsWith("External: ");
}
}
/**
* This is shared that can be shared across permutations for a given
* ClientBundle .
*/
static class CachedState {
public final Map bundledImages =
new LinkedHashMap();
public final Map externalImages =
new LinkedHashMap();
}
/**
* Associates an ImageRect and a LocalizedImage.
*/
static class CannotBundleImageException extends Exception {
private final ImageRect imageRect;
private final LocalizedImage localized;
public CannotBundleImageException(LocalizedImage localized, ImageRect imageRect) {
this.localized = localized;
this.imageRect = imageRect;
}
public ImageRect getImageRect() {
return imageRect;
}
public LocalizedImage getLocalizedImage() {
return localized;
}
}
/**
* Represents a file that contains image data.
*/
abstract static class DisplayedImage {
protected String normalContentsFieldName;
protected String rtlContentsFieldName;
public abstract Class getResourceType();
public abstract ImageRect getImageRect(ImageResourceDeclaration image);
/**
* Only valid after calling {@link #render}.
*/
public String getNormalContentsFieldName() {
return normalContentsFieldName;
}
/**
* Only valid after calling {@link #render}, may be null if
* there is no RTL version of the image.
*/
public String getRtlContentsFieldName() {
return rtlContentsFieldName;
}
public abstract void setRtlImage(LocalizedImage image);
abstract void render(TreeLogger logger, ResourceContext context,
ClientBundleFields fields, RepeatStyle repeatStyle)
throws UnableToCompleteException;
}
/**
* Represents a file that contains exactly one image.
*/
static class ExternalImage extends DisplayedImage {
private final ImageResourceDeclaration image;
private boolean isRtl;
private final LocalizedImage localized;
private final ImageRect rect;
/**
* Create an unbundled image.
*/
public ExternalImage(ImageResourceDeclaration image, LocalizedImage localized, ImageRect rect) {
this.image = image;
this.localized = localized;
this.rect = rect;
}
@Override
public Class getResourceType() {
return ImageResourcePrototype.class;
}
@Override
public ImageRect getImageRect(ImageResourceDeclaration image) {
return this.image.equals(image) ? rect : null;
}
@Override
public void render(TreeLogger logger, ResourceContext context,
ClientBundleFields fields, RepeatStyle repeatStyle)
throws UnableToCompleteException {
JClassType stringType =
context.getGeneratorContext().getTypeOracle().findType(String.class.getCanonicalName());
String contentsExpression = context.deploy(
localized.getUrl(), null, image.isPreventInlining());
normalContentsFieldName = fields.define(stringType, "externalImage",
contentsExpression, true, true);
if (isRtl) {
// Create a transformation to mirror about the Y-axis and translate
AffineTransform tx = new AffineTransform();
tx.setTransform(-1, 0, 0, 1, rect.getWidth(), 0);
rect.setTransform(tx);
byte[] rtlData = ImageBundleBuilder.toPng(logger, rect);
String rtlContentsUrlExpression = context.deploy(image.getName()
+ "_rtl.png", "image/png", rtlData, image.isPreventInlining());
rtlContentsFieldName = fields.define(stringType, "externalImage_rtl",
rtlContentsUrlExpression, true, true);
}
}
@Override
public void setRtlImage(LocalizedImage localized) {
if (this.localized.equals(localized)) {
isRtl = true;
}
}
}
/**
* This represent how the user described the image in the original Java
* source. Its identity is based on the ImageResource JMethod.
*/
static class ImageResourceDeclaration extends StringKey {
private static String key(JMethod method) {
return method.getEnclosingType().getQualifiedSourceName() + "." + method.getName();
}
private final String name;
private final JMethod method;
private final ImageOptions options;
public ImageResourceDeclaration(JMethod method) {
super(key(method));
this.name = method.getName();
this.method = method;
this.options = method.getAnnotation(ImageOptions.class);
}
public JMethod getMethod() {
return method;
}
public String getName() {
return name;
}
public RepeatStyle getRepeatStyle() {
return options == null ? RepeatStyle.None : options.repeatStyle();
}
public int getScaleHeight() {
return options == null ? -1 : options.height();
}
public int getScaleWidth() {
return options == null ? -1 : options.width();
}
public boolean isFlipRtl() {
return options == null ? false : options.flipRtl();
}
public boolean isPreventInlining() {
return options == null ? false : options.preventInlining();
}
}
/**
* This represents the particular collections of bits associated with a
* localized resource that a permutation will use. Its identity is based on
* the content hash of the resolved data and any transformations that will be
* applied to the data.
*/
static class LocalizedImage extends StringKey {
public static LocalizedImage create(TreeLogger logger,
ResourceContext context, ImageResourceDeclaration image)
throws UnableToCompleteException {
URL[] resources = ResourceGeneratorUtil.findResources(logger, context, image.getMethod());
if (resources.length != 1) {
logger.log(TreeLogger.ERROR, "Exactly one image may be specified", null);
throw new UnableToCompleteException();
}
URL resource = resources[0];
LocalizedImage toReturn = new LocalizedImage(image, resource);
return toReturn;
}
private static String key(ImageResourceDeclaration image, URL url) {
return Util.computeStrongName(Util.readURLAsBytes(url)) + ":"
+ image.getScaleHeight() + ":" + image.getScaleWidth();
}
private final ImageResourceDeclaration image;
private final URL url;
public LocalizedImage(LocalizedImage other, URL alternateUrl) {
this(other.image, alternateUrl);
}
private LocalizedImage(ImageResourceDeclaration image, URL url) {
super(key(image, url));
this.image = image;
this.url = url;
}
public URL getUrl() {
return url;
}
}
/**
* Re-encode an image as a PNG to strip random header data.
*/
private static URL renderToTempPngFile(TreeLogger logger,
ImageBundleBuilder builder, Arranger arranger)
throws UnableToCompleteException {
try {
byte[] imageBytes = builder.render(logger, arranger);
if (imageBytes == null) {
return null;
}
File file = File.createTempFile(ImageResourceGenerator.class.getSimpleName(), ".png");
file.deleteOnExit();
Util.writeBytesToFile(logger, file, imageBytes);
return file.toURI().toURL();
} catch (IOException ex) {
logger.log(TreeLogger.ERROR, "Unable to write re-encoded PNG", ex);
throw new UnableToCompleteException();
}
}
/**
* This is used to short-circuit the {@link #prepare} method.
*/
private boolean prepared;
private CachedState shared;
@Override
public String createAssignment(TreeLogger logger, ResourceContext context, JMethod method)
throws UnableToCompleteException {
String name = method.getName();
ImageResourceDeclaration image = new ImageResourceDeclaration(method);
DisplayedImage bundle = getImage(image);
SourceWriter sw = new StringSourceWriter();
sw.println("new " + bundle.getResourceType().getCanonicalName() + "(");
sw.indent();
sw.println('"' + name + "\",");
ImageRect rect = bundle.getImageRect(image);
if (rect == null) {
throw new NullPointerException("No ImageRect ever computed for " + name);
}
String[] urlExpressions =
new String[] {bundle.getNormalContentsFieldName(), bundle.getRtlContentsFieldName()};
assert urlExpressions[0] != null : "No primary URL expression for " + name;
if (urlExpressions[1] == null) {
sw.println(UriUtils.class.getName() + ".fromTrustedString(" + urlExpressions[0] + "),");
} else {
sw.println(UriUtils.class.getName() + ".fromTrustedString("
+ "com.google.gwt.i18n.client.LocaleInfo.getCurrentLocale().isRTL() ?"
+ urlExpressions[1] + " : " + urlExpressions[0] + "),");
}
sw.println(rect.getLeft() + ", " + rect.getTop() + ", " + rect.getWidth() + ", "
+ rect.getHeight() + ", " + rect.isAnimated() + ", " + rect.isLossy());
sw.outdent();
sw.print(")");
return sw.toString();
}
/**
* We use this as a signal that we have received all image methods and can now
* create the bundled images.
*/
@Override
public void createFields(TreeLogger logger, ResourceContext context, ClientBundleFields fields)
throws UnableToCompleteException {
renderImageMap(logger, context, fields, shared.bundledImages);
renderImageMap(logger, context, fields, shared.externalImages);
}
@Override
public void init(TreeLogger logger, ResourceContext context) {
String key = createCacheKey(context);
shared = context.getCachedData(key, CachedState.class);
prepared = shared != null;
if (prepared) {
logger.log(TreeLogger.DEBUG, "Using cached data");
} else {
shared = new CachedState();
context.putCachedData(key, shared);
}
}
/**
* Process each image method. This will either assign the image to an
* ImageBundleBuilder or reencode an external image.
*/
@Override
public void prepare(TreeLogger logger, ResourceContext context,
ClientBundleRequirements requirements, JMethod method)
throws UnableToCompleteException {
if (prepared) {
logger.log(TreeLogger.DEBUG, "ImageResources already prepared");
return;
}
ImageResourceDeclaration image = new ImageResourceDeclaration(method);
boolean cannotBundle = false;
DisplayedImage displayed = null;
LocalizedImage localizedImage;
ImageRect rect;
try {
BundledImage bundledImage = (BundledImage) getImage(image);
localizedImage = bundledImage.addImage(logger, context, image);
rect = bundledImage.getImageRect(image);
displayed = bundledImage;
// mirrors the "unbundled" case in BundleKey.
if (image.isPreventInlining() || image.getRepeatStyle() == RepeatStyle.Both) {
cannotBundle = true;
}
} catch (CannotBundleImageException e) {
cannotBundle = true;
localizedImage = e.getLocalizedImage();
rect = e.getImageRect();
}
// Store the image externally
if (cannotBundle) {
if (rect.isAnimated() || rect.isLossy()) {
// Don't re-encode
} else {
/*
* Try to re-compress the image, but only use the re-compressed bytes if
* they actually offer a space-savings.
*/
try {
int originalSize = getContentLength(localizedImage.getUrl());
// Re-encode the data
URL reencodedContents = reencodeToTempFile(logger, rect);
int newSize = getContentLength(reencodedContents);
// But only use it if we did a better job on compression
if (newSize < originalSize) {
if (logger.isLoggable(TreeLogger.SPAM)) {
logger.log(TreeLogger.SPAM, "Reencoded image and saved "
+ (originalSize - newSize) + " bytes");
}
localizedImage = new LocalizedImage(localizedImage, reencodedContents);
}
} catch (IOException e2) {
// Non-fatal, but weird
logger.log(TreeLogger.WARN,
"Unable to determine before/after size when re-encoding image " + "data", e2);
}
}
ExternalImage externalImage = new ExternalImage(image, localizedImage, rect);
shared.externalImages.put(new BundleKey(image, true), externalImage);
displayed = externalImage;
}
if (image.isFlipRtl()) {
displayed.setRtlImage(localizedImage);
}
}
/**
* Helper method to read the contentLength of a given URL, automatically
* closing the InputStream that is opened as a side effect.
*/
private int getContentLength(URL url) throws IOException {
URLConnection conn = url.openConnection();
try {
return conn.getContentLength();
} finally {
Utility.close(conn.getInputStream());
}
}
/**
* Creates a cache key to be used with {@link ResourceContext#putCachedData}.
* The key is based on the ClientBundle type, support for data URLs, and the
* current locale.
*/
private String createCacheKey(ResourceContext context) {
StringBuilder sb = new StringBuilder();
sb.append(context.getClientBundleType().getQualifiedSourceName());
sb.append(":").append(context.supportsDataUrls());
try {
String locale = context.getGeneratorContext().getPropertyOracle().getSelectionProperty(
TreeLogger.NULL, "locale").getCurrentValue();
// add the locale selection property as a permuation axis for our requirements
context.getRequirements().addPermutationAxis("locale");
sb.append(locale);
} catch (BadPropertyValueException e) {
// OK, locale isn't defined
}
return sb.toString();
}
private DisplayedImage getImage(ImageResourceDeclaration image) {
DisplayedImage toReturn = shared.externalImages.get(new BundleKey(image, true));
if (toReturn != null) {
return toReturn;
}
BundleKey key = new BundleKey(image, false);
toReturn = shared.bundledImages.get(key);
if (toReturn == null) {
BundledImage bundled = new BundledImage();
shared.bundledImages.put(key, bundled);
toReturn = bundled;
}
return toReturn;
}
/**
* Re-encode an image as a PNG to strip random header data.
*/
private URL reencodeToTempFile(TreeLogger logger, ImageRect rect)
throws UnableToCompleteException {
try {
byte[] imageBytes = ImageBundleBuilder.toPng(logger, rect);
if (imageBytes == null) {
return null;
}
File file = File.createTempFile(ImageResourceGenerator.class.getSimpleName(), ".png");
file.deleteOnExit();
Util.writeBytesToFile(logger, file, imageBytes);
return file.toURI().toURL();
} catch (IOException ex) {
logger.log(TreeLogger.ERROR, "Unable to write re-encoded PNG", ex);
throw new UnableToCompleteException();
}
}
private void renderImageMap(TreeLogger logger, ResourceContext context,
ClientBundleFields fields, Map map)
throws UnableToCompleteException {
for (Map.Entry entry : map.entrySet()) {
DisplayedImage bundle = entry.getValue();
bundle.render(logger, context, fields, entry.getKey().getRepeatStyle());
}
}
}
