Basic android.graphics Rect and Canvas implementation (#461)

Some extensions use more Canvas methods, but they don't
really seem to get that far yet, all the others I was
able to test seem to work now.

Author: animeavi

AndroidCompat/build.gradle.kts

@@ -26,8 +26,12 @@ dependencies {
     // Android version of SimpleDateFormat
     implementation("com.ibm.icu:icu4j:72.1")
 
-    // OpenJDK lacks a native JPEG encoder
+    // OpenJDK lacks native JPEG encoder and native WEBP decoder
     implementation("com.twelvemonkeys.common:common-lang:3.9.4")
+    implementation("com.twelvemonkeys.common:common-io:3.9.4")
+    implementation("com.twelvemonkeys.common:common-image:3.9.4")
     implementation("com.twelvemonkeys.imageio:imageio-core:3.9.4")
+    implementation("com.twelvemonkeys.imageio:imageio-metadata:3.9.4")
     implementation("com.twelvemonkeys.imageio:imageio-jpeg:3.4.1")
+    implementation("com.twelvemonkeys.imageio:imageio-webp:3.9.4")
 }

AndroidCompat/src/main/java/android/graphics/BitmapFactory.java

@@ -4,33 +4,48 @@
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
 import java.io.IOException;
+import java.util.Iterator;
 import javax.imageio.ImageIO;
+import javax.imageio.ImageReader;
+import javax.imageio.stream.ImageInputStream;
 
 public class BitmapFactory {
-    public static Bitmap decodeStream(InputStream is) {
-        Bitmap bm = null;
+    public static Bitmap decodeStream(InputStream inputStream) {
+        Bitmap bitmap = null;
 
         try {
-            BufferedImage bf = ImageIO.read(is);
-            bm = new Bitmap(bf);
+            ImageInputStream imageInputStream = ImageIO.createImageInputStream(inputStream);
+            Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(imageInputStream);
+
+            if (!imageReaders.hasNext()) {
+                throw new IllegalArgumentException("no reader for image");
+            }
+
+            ImageReader imageReader = imageReaders.next();
+            imageReader.setInput(imageInputStream);
+
+            BufferedImage image = imageReader.read(0, imageReader.getDefaultReadParam());
+            bitmap = new Bitmap(image);
+
+            imageReader.dispose();
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }
 
-        return bm;
+        return bitmap;
     }
 
     public static Bitmap decodeByteArray(byte[] data, int offset, int length) {
-        Bitmap bm = null;
+        Bitmap bitmap = null;
 
-        ByteArrayInputStream bais = new ByteArrayInputStream(data);
+        ByteArrayInputStream byteArrayStream = new ByteArrayInputStream(data);
         try {
-            BufferedImage bf = ImageIO.read(bais);
-            bm = new Bitmap(bf);
+            BufferedImage image = ImageIO.read(byteArrayStream);
+            bitmap = new Bitmap(image);
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }
 
-        return bm;
+        return bitmap;
     }
 }

AndroidCompat/src/main/java/android/graphics/Canvas.java

@@ -0,0 +1,21 @@
+package android.graphics;
+
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import javax.imageio.ImageIO;
+
+public final class Canvas {
+    private BufferedImage canvasImage;
+    private Graphics2D canvas;
+
+    public Canvas(Bitmap bitmap) {
+        canvasImage = bitmap.getImage();
+        canvas = canvasImage.createGraphics();
+    }
+
+    public void drawBitmap(Bitmap sourceBitmap, Rect src, Rect dst, Paint paint) {        
+        BufferedImage sourceImage = sourceBitmap.getImage();
+        BufferedImage sourceImageCropped = sourceImage.getSubimage(src.left, src.top, src.getWidth(), src.getHeight());
+        canvas.drawImage(sourceImageCropped, null, dst.left, dst.top);
+    }
+}

AndroidCompat/src/main/java/android/graphics/Rect.java

@@ -0,0 +1,122 @@
+package android.graphics;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public final class Rect {
+    int left;
+    int top;
+    int right;
+    int bottom;
+
+    private static final class UnflattenHelper {
+        private static final Pattern FLATTENED_PATTERN = Pattern.compile(
+            "(-?\\d+) (-?\\d+) (-?\\d+) (-?\\d+)");
+
+        static Matcher getMatcher(String str) {
+            return FLATTENED_PATTERN.matcher(str);
+        }
+    }
+
+    public Rect() {
+    }
+
+    public Rect(int left, int top, int right, int bottom) {
+        this.left = left;
+        this.top = top;
+        this.right = right;
+        this.bottom = bottom;
+    }
+
+    public Rect(Rect r) {
+        if (r == null) {
+            this.left = 0;
+            this.top = 0;
+            this.right = 0;
+            this.bottom = 0;
+        } else {
+            this.left = left;
+            this.top = top;
+            this.right = right;
+            this.bottom = bottom;
+        }
+    }
+
+    public final int getWidth() {
+        return right - left;
+    }
+
+    public final int getHeight() {
+        return bottom - top;
+    }
+
+    public static Rect unflattenFromString(String str) {
+        if (str.isEmpty()) {
+            return null;
+        }
+
+        Matcher matcher = UnflattenHelper.getMatcher(str);
+        if (!matcher.matches()) {
+            return null;
+        }
+
+        return new Rect(Integer.parseInt(matcher.group(1)),
+                        Integer.parseInt(matcher.group(2)),
+                        Integer.parseInt(matcher.group(3)),
+                        Integer.parseInt(matcher.group(4)));
+    }
+
+    public String toShortString() {
+        return toShortString(new StringBuilder(32));
+    }
+    
+    public String toShortString(StringBuilder sb) {
+        sb.setLength(0);
+        sb.append('['); sb.append(left); sb.append(',');
+        sb.append(top); sb.append("]["); sb.append(right);
+        sb.append(','); sb.append(bottom); sb.append(']');
+        return sb.toString();
+    }
+
+    public String flattenToString() {
+        StringBuilder sb = new StringBuilder(32);
+        sb.append(left);
+        sb.append(' ');
+        sb.append(top);
+        sb.append(' ');
+        sb.append(right);
+        sb.append(' ');
+        sb.append(bottom);
+        return sb.toString();
+    }
+
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeInt(left);
+        out.writeInt(top);
+        out.writeInt(right);
+        out.writeInt(bottom);
+    }
+
+    public static final Parcelable.Creator<Rect> CREATOR = new Parcelable.Creator<Rect>() {
+        @Override
+        public Rect createFromParcel(Parcel in) {
+            Rect r = new Rect();
+            r.readFromParcel(in);
+            return r;
+        }
+
+        @Override
+        public Rect[] newArray(int size) {
+            return new Rect[size];
+        }
+    };
+
+    public void readFromParcel(Parcel in) {
+        left = in.readInt();
+        top = in.readInt();
+        right = in.readInt();
+        bottom = in.readInt();
+    }
+}