android: create thumbnail with "paintTile" LOKit function

Additionally remember the document dimensions, so there is no
continuous call to "getDocumentWidth" and "getDocumentHeight"

Change-Id: I269b47178a25da28de8df98d0bd45211fb64797d

3 files changed, 43 insertions, 3 deletions

diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
index 8085d022429f..5a906c906886 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
@@ -21,7 +21,10 @@ public class LOKitTileProvider implements TileProvider {
     private final LayerController mLayerController;
     private final double mTileWidth;
     private final double mTileHeight;
+
     private double mDPI;
+    private double mWidthTwip;
+    private double mHeightTwip;
 
     public LOKitTileProvider(LayerController layerController, String input) {
         mLayerController = layerController;
@@ -75,7 +78,10 @@ public class LOKitTileProvider implements TileProvider {
             return false;
         }
 
-        if (mDocument.getDocumentWidth() == 0 && mDocument.getDocumentHeight() == 0) {
+        mWidthTwip = mDocument.getDocumentWidth();
+        mHeightTwip = mDocument.getDocumentHeight();
+
+        if (mWidthTwip == 0 && mHeightTwip == 0) {
             Log.e(LOGTAG, "Document size zero - last error: " + mOffice.getError());
         } else {
             Log.i(LOGTAG, "Document size: " + mDocument.getDocumentWidth() + " x " + mDocument.getDocumentHeight());
@@ -86,12 +92,12 @@ public class LOKitTileProvider implements TileProvider {
 
     @Override
     public int getPageWidth() {
-        return (int) twipToPixel(mDocument.getDocumentWidth(), mDPI);
+        return (int) twipToPixel(mWidthTwip, mDPI);
     }
 
     @Override
     public int getPageHeight() {
-        return (int) twipToPixel(mDocument.getDocumentHeight(), mDPI);
+        return (int) twipToPixel(mHeightTwip, mDPI);
     }
 
     @Override
@@ -99,6 +105,7 @@ public class LOKitTileProvider implements TileProvider {
         return mDocument != null;
     }
 
+    @Override
     public SubTile createTile(int x, int y) {
         ByteBuffer buffer = ByteBuffer.allocateDirect(TILE_SIZE * TILE_SIZE * 4);
         Bitmap bitmap = Bitmap.createBitmap(TILE_SIZE, TILE_SIZE, Bitmap.Config.ARGB_8888);
@@ -114,6 +121,29 @@ public class LOKitTileProvider implements TileProvider {
     }
 
     @Override
+    public Bitmap thumbnail() {
+        ByteBuffer buffer = ByteBuffer.allocateDirect(TILE_SIZE * TILE_SIZE * 4);
+        Bitmap bitmap = Bitmap.createBitmap(TILE_SIZE, TILE_SIZE, Bitmap.Config.ARGB_8888);
+
+        int widthPixel = getPageWidth();
+        int heightPixel = getPageHeight();
+
+        if (widthPixel > heightPixel) {
+            double ratio = heightPixel / (double) widthPixel;
+            widthPixel = 1000;
+            heightPixel = (int) (widthPixel * ratio);
+        } else {
+            double ratio = widthPixel / (double) heightPixel;
+            heightPixel = 1000;
+            widthPixel = (int) (heightPixel * ratio);
+        }
+
+        mDocument.paintTile(buffer, widthPixel, heightPixel, 0, 0, (int) mWidthTwip, (int) mHeightTwip);
+
+        return bitmap;
+    }
+
+    @Override
     public void changePart(int partIndex) {
         mDocument.setPart(partIndex);
     }
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/MockTileProvider.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/MockTileProvider.java
index 8de60d6abd34..60abbdf96960 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/MockTileProvider.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/MockTileProvider.java
@@ -62,6 +62,11 @@ public class MockTileProvider implements TileProvider {
     }
 
     @Override
+    public Bitmap thumbnail() {
+        return null;
+    }
+
+    @Override
     public void changePart(int partIndex) {
 
     }
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/TileProvider.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/TileProvider.java
index 63e358d7d984..4202d28ad98e 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/TileProvider.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/TileProvider.java
@@ -1,10 +1,13 @@
 package org.libreoffice;
 
 
+import android.graphics.Bitmap;
+
 import org.mozilla.gecko.gfx.SubTile;
 
 public interface TileProvider {
     int getPageWidth();
+
     int getPageHeight();
 
     boolean isReady();
@@ -12,4 +15,6 @@ public interface TileProvider {
     SubTile createTile(int x, int y);
 
     void changePart(int partIndex);
+
+    Bitmap thumbnail();
 }