Limit the SkPicture size we use to paint.

This improves performances by a visible factor on some websites.

bug:4124418
Change-Id: I9b24408b686e24cf323eb5bae977d74a0f2e2a34

3 files changed, 20 insertions, 11 deletions

diff --git a/WebCore/platform/graphics/android/BaseTile.cpp b/WebCore/platform/graphics/android/BaseTile.cpp
index 4400ea5..c67e2b8 100644
--- a/WebCore/platform/graphics/android/BaseTile.cpp
+++ b/WebCore/platform/graphics/android/BaseTile.cpp
@@ -32,6 +32,7 @@
 #include "SkBitmap.h"
 #include "SkBitmapRef.h"
 #include "SkCanvas.h"
+#include "SkPicture.h"
 #include "TilesManager.h"
 
 #include <EGL/egl.h>
@@ -420,11 +421,13 @@ int BaseTile::paintPartialBitmap(SkIRect r, float ptx, float pty,
     SkCanvas canvas(bitmap);
     canvas.drawARGB(255, 255, 255, 255);
 
-    canvas.save();
-    canvas.scale(scale, scale);
-    canvas.translate(tx, ty);
-    int pictureCount = tiledPage->paintBaseLayerContent(&canvas);
-    canvas.restore();
+    SkPicture picture;
+    SkCanvas* nCanvas = picture.beginRecording(rect.width(), rect.height());
+    nCanvas->scale(scale, scale);
+    nCanvas->translate(tx, ty);
+    int pictureCount = tiledPage->paintBaseLayerContent(nCanvas);
+    picture.endRecording();
+    picture.draw(&canvas);
 
     if (TilesManager::instance()->getShowVisualIndicator()) {
         int color = 20 + pictureCount % 100;
diff --git a/WebCore/platform/graphics/android/LayerAndroid.cpp b/WebCore/platform/graphics/android/LayerAndroid.cpp
index 33d98ea..0f2faa0 100644
--- a/WebCore/platform/graphics/android/LayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/LayerAndroid.cpp
@@ -1014,13 +1014,16 @@ void LayerAndroid::paintBitmapGL()
     float scale = texture->scale();
 
     IntRect textureRect = texture->rect();
-
-    canvas->save();
     canvas->drawARGB(0, 0, 0, 0, SkXfermode::kClear_Mode);
-    canvas->scale(scale, scale);
-    canvas->translate(-textureRect.x(), -textureRect.y());
-    contentDraw(canvas);
-    canvas->restore();
+
+    SkPicture picture;
+    SkCanvas* nCanvas = picture.beginRecording(textureRect.width(),
+                                               textureRect.height());
+    nCanvas->scale(scale, scale);
+    nCanvas->translate(-textureRect.x(), -textureRect.y());
+    contentDraw(nCanvas);
+    picture.endRecording();
+    picture.draw(canvas);
 
     m_atomicSync.lock();
     texture->setTextureInfoFor(this);
diff --git a/WebCore/platform/graphics/android/TiledPage.cpp b/WebCore/platform/graphics/android/TiledPage.cpp
index a400a4a..4fa3e0e 100644
--- a/WebCore/platform/graphics/android/TiledPage.cpp
+++ b/WebCore/platform/graphics/android/TiledPage.cpp
@@ -151,6 +151,9 @@ void TiledPage::prepareRow(bool goingLeft, int tilesInRow, int firstTileX, int y
         else
             x += i;
 
+        if (x < 0)
+            continue;
+
         BaseTile* currentTile = 0;
         BaseTile* availableTile = 0;
         for (int j = 0; j < m_baseTileSize; j++) {