Render themes: SVG resources on iOS

vtm-ios/src/org/oscim/ios/backend/IosBitmap.java

@@ -122,6 +122,25 @@ public class IosBitmap implements Bitmap {
         image.dispose();
     }
 
+    /**
+     * protected constructor for create IosBitmap from IosSvgBitmap
+     * @param image
+     */
+    protected IosBitmap(UIImage image){
+        CGImage cgiIimage = image.getCGImage();
+        this.width = (int) cgiIimage.getWidth();
+        this.height = (int) cgiIimage.getHeight();
+        this.cgBitmapContext = CGBitmapContext.create(width, height, 8, 4 * width,
+                CGColorSpace.createDeviceRGB(), CGImageAlphaInfo.PremultipliedLast);
+
+        this.cgBitmapContext.drawImage(new CGRect(0, 0, width, height), cgiIimage);
+
+        // can dispose helper images for release memory
+        image.dispose();
+        cgiIimage.dispose();
+
+    }
+
 
     @Override
     public int getWidth() {

vtm-ios/src/org/oscim/ios/backend/IosGraphics.java

@@ -63,8 +63,12 @@ public class IosGraphics extends CanvasAdapter {
 
     @Override
     protected Bitmap decodeSvgBitmapImpl(InputStream inputStream) {
-        // TODO
-        return null;
+        try {
+            return new IosSvgBitmap(inputStream);
+        } catch (IOException e) {
+            log.error("decodeSvgImpl", e);
+            return null;
+        }
     }
 
     @Override

vtm-ios/src/org/oscim/ios/backend/IosPaint.java

@@ -269,7 +269,6 @@ public class IosPaint implements Paint {
                 fontHeight = (float) ctFont.getBoundingBox().getHeight();
 
                 font = ctFont.as(UIFont.class);
-                log.debug("Put Font to buffer :" + key);
                 fontHashMap.put(key, font);
             }
 

vtm-ios/src/org/oscim/ios/backend/IosSvgBitmap.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2016 Longri
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.ios.backend;
+
+
+import org.oscim.backend.CanvasAdapter;
+import org.robovm.apple.coregraphics.CGRect;
+import org.robovm.apple.coregraphics.CGSize;
+import org.robovm.apple.uikit.UIImage;
+import svg.SVGRenderer;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+/**
+ * Created by Longri on 17.07.16.
+ */
+public class IosSvgBitmap extends IosBitmap {
+    private static final float DEFAULT_SIZE = 400f;
+
+    /**
+     * Constructor<br>
+     * @param inputStream
+     * @throws IOException
+     */
+    public IosSvgBitmap(InputStream inputStream) throws IOException {
+        super(getUIImage(inputStream));
+    }
+
+    //get UIImage from SVG file
+    private static UIImage getUIImage(InputStream inputStream) {
+        String svg = getStringFromInputStream(inputStream);
+        SVGRenderer renderer = new SVGRenderer(svg);
+        CGRect viewRect = renderer.getViewRect();
+
+        float scaleFactor = CanvasAdapter.dpi / 240;
+        double scale = scaleFactor / Math.sqrt((viewRect.getHeight() * viewRect.getWidth()) / DEFAULT_SIZE);
+
+        float bitmapWidth = (float) (viewRect.getWidth() * scale);
+        float bitmapHeight = (float) (viewRect.getHeight() * scale);
+
+        return renderer.asImageWithSize(new CGSize(bitmapWidth, bitmapHeight), 1);
+    }
+
+
+    // convert InputStream to String
+    private static String getStringFromInputStream(InputStream is) {
+
+        BufferedReader br = null;
+        StringBuilder sb = new StringBuilder();
+
+        String line;
+        try {
+
+            br = new BufferedReader(new InputStreamReader(is));
+            while ((line = br.readLine()) != null) {
+                sb.append(line);
+            }
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (br != null) {
+                try {
+                    br.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return sb.toString();
+    }
+}