Adding option in SkPicture to record device-space bounds of draw commands.

tests/PictureTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "Test.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkData.h"
@@ skipping 431 matching lines @@
     {
         // Test without call to endRecording
         SkPicture picture;
         picture.beginRecording(1, 1);
         SkPicture* destPicture = picture.clone();
         REPORTER_ASSERT(reporter, NULL != destPicture);
         destPicture->unref();
     }
 }
 
+static void test_subregion_playback(skiatest::Reporter* reporter) {
+    // This test verifies early content clipping based on encoded bounds
+    // in SkPicture playback. We verify that content will properly propagate
+    // to the destination canvas in the case where the recorded content is
+    // outside the bounds of the playback canvas, but is brought in-bounds by
+    // a pre-playback transform that is applied to the destination canvas.
+    // In other words, we are verifying that clipping optimizations are
+    // handled in matching frames of reference.
+    SkPicture picture;
+    SkCanvas* recordingCanvas = picture.beginRecording(10, 10);
+    SkPaint paint;
+    paint.setColor(SK_ColorWHITE);
+    SkRect rect = SkRect::MakeXYWH(SkIntToScalar(8), SkIntToScalar(8), SK_Scalar1, SK_Scalar1);
+    recordingCanvas->drawRect(rect, paint);
+    picture.endRecording();
+    SkBitmap store;
+    store.setConfig(SkBitmap::kARGB_8888_Config, 3, 3);
+    store.allocPixels();
+    SkCanvas playbackCanvas(store);
+    playbackCanvas.clear(SK_ColorTRANSPARENT);
+    playbackCanvas.translate(SkIntToScalar(-7), SkIntToScalar(-7));
+    playbackCanvas.drawPicture(picture);
+    for (int x = 0; x < 3; x++) {
+        for (int y = 0; y < 3; y++) {
+            if (1 == x && 1 == y) {
+                REPORTER_ASSERT(reporter, SK_ColorWHITE == store.getColor(x,y));
+            } else {
+                REPORTER_ASSERT(reporter, SK_ColorTRANSPARENT == store.getColor(x,y));
+            }
+        }
+    }
+}
+
 static void test_clip_bound_opt(skiatest::Reporter* reporter) {
     // Test for crbug.com/229011
     SkRect rect1 = SkRect::MakeXYWH(SkIntToScalar(4), SkIntToScalar(4),
                                     SkIntToScalar(2), SkIntToScalar(2));
     SkRect rect2 = SkRect::MakeXYWH(SkIntToScalar(7), SkIntToScalar(7),
                                     SkIntToScalar(1), SkIntToScalar(1));
     SkRect rect3 = SkRect::MakeXYWH(SkIntToScalar(6), SkIntToScalar(6),
                                     SkIntToScalar(1), SkIntToScalar(1));
 
     SkPath invPath;
@@ skipping 90 matching lines @@
 #ifdef SK_DEBUG
     test_deleting_empty_playback();
     test_serializing_empty_picture();
 #else
     test_bad_bitmap();
 #endif
     test_peephole();
     test_gatherpixelrefs(reporter);
     test_bitmap_with_encoded_data(reporter);
     test_clone_empty(reporter);
+    test_subregion_playback(reporter);
     test_clip_bound_opt(reporter);
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("Pictures", PictureTestClass, TestPicture)