Correctly apply linear filter to drawBitmap(Rect, Rect)

Change-Id: I1049282e1996b1020c92cb7bec46e9f28e94e967
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index e67abbd..ed2fa3c 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -1489,13 +1489,19 @@
         const float x = (int) floorf(dstLeft + mSnapshot->transform->getTranslateX() + 0.5f);
         const float y = (int) floorf(dstTop + mSnapshot->transform->getTranslateY() + 0.5f);
 
-        texture->setFilter(GL_NEAREST, GL_NEAREST, true);
+        GLenum filter = GL_NEAREST;
+        if (u1 > 0.0f || u2 < 1.0f || v1 > 0.0f || v2 < 1.0f) {
+            filter = GL_LINEAR;
+        }
+        texture->setFilter(filter, filter, true);
+
         drawTextureMesh(x, y, x + (dstRight - dstLeft), y + (dstBottom - dstTop),
                 texture->id, alpha / 255.0f, mode, texture->blend,
                 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
                 GL_TRIANGLE_STRIP, gMeshCount, false, true);
     } else {
         texture->setFilter(GL_LINEAR, GL_LINEAR, true);
+
         drawTextureMesh(dstLeft, dstTop, dstRight, dstBottom, texture->id, alpha / 255.0f,
                 mode, texture->blend, &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0],
                 GL_TRIANGLE_STRIP, gMeshCount);
diff --git a/libs/hwui/SkiaShader.cpp b/libs/hwui/SkiaShader.cpp
index 1a60dca..06382f2 100644
--- a/libs/hwui/SkiaShader.cpp
+++ b/libs/hwui/SkiaShader.cpp
@@ -144,8 +144,11 @@
 
     // Uniforms
     bindTexture(texture, mWrapS, mWrapT);
-    GLenum filter = textureTransform.isPureTranslate() ? GL_NEAREST : GL_LINEAR;
-    texture->setFilter(filter, filter);
+    // Assume linear here; we should really check the transform in
+    // ::updateTransforms() but we don't have the texture object
+    // available at that point. The optimization is not worth the
+    // effort for now.
+    texture->setFilter(GL_LINEAR, GL_LINEAR);
 
     glUniform1i(program->getUniform("bitmapSampler"), textureSlot);
     glUniformMatrix4fv(program->getUniform("textureTransform"), 1,
diff --git a/tests/HwAccelerationTest/AndroidManifest.xml b/tests/HwAccelerationTest/AndroidManifest.xml
index 9fcd05a..d74d80d 100644
--- a/tests/HwAccelerationTest/AndroidManifest.xml
+++ b/tests/HwAccelerationTest/AndroidManifest.xml
@@ -31,6 +31,15 @@
         android:hardwareAccelerated="true">
 
         <activity
+                android:name="TextFadeActivity"
+                android:label="_TextFade">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <activity
                 android:name="MaxBitmapSizeActivity"
                 android:label="_MaxBitmapSize">
             <intent-filter>
diff --git a/tests/HwAccelerationTest/res/layout/text_fade.xml b/tests/HwAccelerationTest/res/layout/text_fade.xml
new file mode 100644
index 0000000..8da2204
--- /dev/null
+++ b/tests/HwAccelerationTest/res/layout/text_fade.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2010 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/contact_tile_name"
+        android:layout_width="105dip"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentLeft="true"
+        android:layout_marginLeft="8dip"
+        android:layout_marginBottom="20dip"
+        android:textColor="@android:color/white"
+        android:singleLine="true"
+        android:ellipsize="marquee"
+        android:fadingEdgeLength="16sp"
+        android:fadingEdge="horizontal"
+        android:text="This is a really really really really really really long string"
+        android:textSize="16sp" />
+
+</FrameLayout>
diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/TextFadeActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/TextFadeActivity.java
new file mode 100644
index 0000000..c8bbc7d
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/TextFadeActivity.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.test.hwui;
+
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.os.Bundle;
+import android.view.View;
+
+@SuppressWarnings({"UnusedDeclaration"})
+public class TextFadeActivity extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setContentView(R.layout.text_fade);
+    }
+}