Scale images when scaling text

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -475,6 +475,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         private TwoStateOwner powner = new TwoStateOwner(owner, "MessagePopup");
 
         private ScaleGestureDetector gestureDetector;
+        private Map<Drawable, Pair<Integer, Integer>> drawableSize = new HashMap<>();
 
         private SimpleTask taskContactInfo;
 
@@ -757,31 +758,52 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 btnCalendarMaybe.setOnLongClickListener(this);
 
                 gestureDetector = new ScaleGestureDetector(context, new ScaleGestureDetector.SimpleOnScaleGestureListener() {
-                    private float scale = 1.0f;
                     private Toast toast = null;
 
                     @Override
                     public boolean onScale(ScaleGestureDetector detector) {
                         TupleMessageEx message = getMessage();
                         if (message != null) {
+                            // Scale factor
                             float factor = detector.getScaleFactor();
                             float size = tvBody.getTextSize() * factor;
+                            float scale = (textSize == 0 ? 1.0f : size / (textSize * message_zoom / 100f));
+
+                            // Text size
                             properties.setSize(message.id, size);
                             tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
 
-                            scale = scale * factor;
-                            String perc = Math.round(scale * message_zoom) + " %";
+                            // Image size
+                            Spanned spanned = (Spanned) tvBody.getText();
+                            int bw = tvBody.getWidth() - tvBody.getPaddingStart() - tvBody.getPaddingEnd();
+                            if (bw != 0)
+                                for (ImageSpan img : spanned.getSpans(0, spanned.length(), ImageSpan.class)) {
+                                    Drawable d = img.getDrawable();
+                                    Pair<Integer, Integer> p = drawableSize.get(d);
+                                    if (p == null || p.first == 0)
+                                        continue;
+
+                                    float s = Math.min(bw / (float) p.first, scale);
+                                    properties.setScale(message.id, s);
+
+                                    int w = Math.round(p.first * s);
+                                    int h = Math.round(p.second * s);
+                                    d.setBounds(0, 0, w, h);
+                                }
+
+                            // Feedback
+                            String perc = Math.round(scale) + " %";
                             if (toast != null)
                                 toast.cancel();
                             toast = ToastEx.makeText(context, perc, Toast.LENGTH_SHORT);
                             toast.show();
                         }
+
                         return true;
                     }
                 });
             }
 
-
             if (accessibility) {
                 view.setAccessibilityDelegate(accessibilityDelegateHeader);
                 header.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
@@ -1948,6 +1970,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             args.putBoolean("show_quotes", show_quotes);
             args.putInt("zoom", zoom);
 
+            args.putFloat("scale", properties.getScale(message.id, 1.0f));
+
             new SimpleTask<Object>() {
                 @Override
                 protected void onPreExecute(Bundle args) {
@@ -1966,6 +1990,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     final boolean show_images = args.getBoolean("show_images");
                     final boolean show_quotes = args.getBoolean("show_quotes");
                     final int zoom = args.getInt("zoom");
+                    final float scale = args.getFloat("scale");
 
                     if (message == null || !message.content)
                         return null;
@@ -2120,10 +2145,17 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                         }
 
                         // Draw images
+                        Map<Drawable, Pair<Integer, Integer>> map = new HashMap<>();
                         SpannableStringBuilder ssb = HtmlHelper.fromDocument(context, document, true, new Html.ImageGetter() {
                             @Override
                             public Drawable getDrawable(String source) {
                                 Drawable drawable = ImageHelper.decodeImage(context, message.id, source, show_images, zoom, tvBody);
+                                Rect bounds = drawable.getBounds();
+                                map.put(drawable, new Pair<>(bounds.right, bounds.bottom));
+
+                                bounds.right = Math.round(bounds.right * scale);
+                                bounds.bottom = Math.round(bounds.bottom * scale);
+                                drawable.setBounds(bounds);
 
                                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                                     if (drawable instanceof AnimatedImageDrawable)
@@ -2133,6 +2165,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                                 return drawable;
                             }
                         }, null);
+                        drawableSize = map;
 
                         if (show_quotes)
                             return ssb;
@@ -5773,6 +5806,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         void setExpanded(TupleMessageEx message, boolean expanded);
 
+        void setScale(long id, Float size);
+
+        float getScale(long id, float defaultSize);
+
         void setSize(long id, Float size);
 
         float getSize(long id, float defaultSize);

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -309,6 +309,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
 
     final private Map<String, String> kv = new HashMap<>();
     final private Map<String, List<Long>> values = new HashMap<>();
+    final private LongSparseArray<Float> scales = new LongSparseArray<>();
     final private LongSparseArray<Float> sizes = new LongSparseArray<>();
     final private LongSparseArray<Integer> heights = new LongSparseArray<>();
     final private LongSparseArray<Pair<Integer, Integer>> positions = new LongSparseArray<>();
@@ -1645,6 +1646,19 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 handleExpand(message.id);
         }
 
+        @Override
+        public void setScale(long id, Float size) {
+            if (size == null)
+                scales.remove(id);
+            else
+                scales.put(id, size);
+        }
+
+        @Override
+        public float getScale(long id, float defaultSize) {
+            return scales.get(id, defaultSize);
+        }
+
         @Override
         public void setSize(long id, Float size) {
             if (size == null)
@@ -3513,6 +3527,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                                 Log.i("Hidden id=" + id);
                                 for (String key : values.keySet())
                                     values.get(key).remove(id);
+                                scales.remove(id);
                                 sizes.remove(id);
                                 heights.remove(id);
                                 positions.remove(id);