Merge "Compute text bounds on a per glyph basis when drawing from an SkPicture." into nyc-dev

am: b64da4c

* commit 'b64da4cac43ad66dc1a1d6e8c963a263cbf932c8':
  Compute text bounds on a per glyph basis when drawing from an SkPicture.

libs/hwui/Android.mk

@@ -265,7 +265,8 @@ ifeq (true, $(HWUI_NEW_OPS))
         tests/unit/FrameBuilderTests.cpp \
         tests/unit/LeakCheckTests.cpp \
         tests/unit/OpDumperTests.cpp \
-        tests/unit/RecordingCanvasTests.cpp
+        tests/unit/RecordingCanvasTests.cpp \
+        tests/unit/SkiaCanvasTests.cpp
 endif
 
 include $(LOCAL_PATH)/hwui_static_deps.mk

libs/hwui/SkiaCanvasProxy.cpp

@@ -318,12 +318,17 @@ void SkiaCanvasProxy::onDrawPosText(const void* text, size_t byteLength, const S
         posArray = pointStorage.get();
     }
 
-    // compute conservative bounds
-    // NOTE: We could call the faster paint.getFontBounds for a less accurate,
-    //       but even more conservative bounds if this  is too slow.
+    // Compute conservative bounds.  If the content has already been processed
+    // by Minikin then it had already computed these bounds.  Unfortunately,
+    // there is no way to capture those bounds as part of the Skia drawPosText
+    // API so we need to do that computation again here.
     SkRect bounds;
-    glyphs.paint.measureText(glyphs.glyphIDs, glyphs.count << 1, &bounds);
-    bounds.offset(x, y);
+    for (int i = 0; i < glyphs.count; i++) {
+        SkRect glyphBounds;
+        glyphs.paint.measureText(&glyphs.glyphIDs[i], sizeof(uint16_t), &glyphBounds);
+        glyphBounds.offset(pos[i].fX, pos[i].fY);
+        bounds.join(glyphBounds);
+    }
 
     static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats");
     mCanvas->drawGlyphs(glyphs.glyphIDs, &posArray[0].fX, glyphs.count, glyphs.paint, x, y,

libs/hwui/tests/unit/SkiaCanvasTests.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include "tests/common/TestUtils.h"
+
+#include <gtest/gtest.h>
+#include <RecordingCanvas.h>
+#include <SkPicture.h>
+#include <SkPictureRecorder.h>
+
+using namespace android;
+using namespace android::uirenderer;
+
+/**
+ * Verify that we get the same culling bounds for text for (1) drawing glyphs
+ * directly to a Canvas or (2) going through a SkPicture as an intermediate step.
+ */
+TEST(SkiaCanvasProxy, drawGlyphsViaPicture) {
+    auto dl = TestUtils::createDisplayList<RecordingCanvas>(200, 200, [](RecordingCanvas& canvas) {
+        // setup test variables
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setTextSize(20);
+        static const char* text = "testing text bounds";
+
+        // draw text directly into Recording canvas
+        TestUtils::drawUtf8ToCanvas(&canvas, text, paint, 25, 25);
+
+        // record the same text draw into a SkPicture and replay it into a Recording canvas
+        SkPictureRecorder recorder;
+        SkCanvas* skCanvas = recorder.beginRecording(200, 200, NULL, 0);
+        std::unique_ptr<Canvas> pictCanvas(Canvas::create_canvas(skCanvas));
+        TestUtils::drawUtf8ToCanvas(pictCanvas.get(), text, paint, 25, 25);
+        SkAutoTUnref<const SkPicture> picture(recorder.endRecording());
+
+        canvas.asSkCanvas()->drawPicture(picture);
+    });
+
+    // verify that the text bounds and matrices match
+    ASSERT_EQ(2U, dl->getOps().size());
+    auto directOp = dl->getOps()[0];
+    auto pictureOp = dl->getOps()[1];
+    ASSERT_EQ(RecordedOpId::TextOp, directOp->opId);
+    EXPECT_EQ(directOp->opId, pictureOp->opId);
+    EXPECT_EQ(directOp->unmappedBounds, pictureOp->unmappedBounds);
+    EXPECT_EQ(directOp->localMatrix, pictureOp->localMatrix);
+}