Expose SkPicture::willPlayBackBitmaps()

This returns true if (1) the picture has finished recording and
(2) this picture or any picture drawn into it refers to any bitmaps. 
It allows clients doing complicated manipulations of the picture to 
early-out when there are no bitmaps present. 

BUG=303281
R=reed@google.com



git-svn-id: http://skia.googlecode.com/svn/trunk@11935 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 45 insertions, 0 deletions

diff --git a/tests/PictureTest.cpp b/tests/PictureTest.cpp
index c7ddcbc9ef..9ef4bb06bd 100644
--- a/tests/PictureTest.cpp
+++ b/tests/PictureTest.cpp
@@ -182,6 +182,7 @@ static void test_gatherpixelrefs(skiatest::Reporter* reporter) {
     for (size_t k = 0; k < SK_ARRAY_COUNT(procs); ++k) {
         SkAutoTUnref<SkPicture> pic(record_bitmaps(bm, pos, N, procs[k]));
 
+        REPORTER_ASSERT(reporter, pic->willPlayBackBitmaps() || N == 0);
         // quick check for a small piece of each quadrant, which should just
         // contain 1 bitmap.
         for (size_t  i = 0; i < SK_ARRAY_COUNT(pos); ++i) {
@@ -607,6 +608,49 @@ static void test_clip_expansion(skiatest::Reporter* reporter) {
     REPORTER_ASSERT(reporter, testCanvas.getClipCount() == 2);
 }
 
+static void test_hierarchical(skiatest::Reporter* reporter) {
+    SkBitmap bm;
+    make_bm(&bm, 10, 10, SK_ColorRED, true);
+
+    SkCanvas* canvas;
+
+    SkPicture childPlain;
+    childPlain.beginRecording(10, 10);
+    childPlain.endRecording();
+    REPORTER_ASSERT(reporter, !childPlain.willPlayBackBitmaps()); // 0
+
+    SkPicture childWithBitmap;
+    childWithBitmap.beginRecording(10, 10)->drawBitmap(bm, 0, 0);
+    childWithBitmap.endRecording();
+    REPORTER_ASSERT(reporter, childWithBitmap.willPlayBackBitmaps()); // 1
+
+    SkPicture parentPP;
+    canvas = parentPP.beginRecording(10, 10);
+    canvas->drawPicture(childPlain);
+    parentPP.endRecording();
+    REPORTER_ASSERT(reporter, !parentPP.willPlayBackBitmaps()); // 0
+
+    SkPicture parentPWB;
+    canvas = parentPWB.beginRecording(10, 10);
+    canvas->drawPicture(childWithBitmap);
+    parentPWB.endRecording();
+    REPORTER_ASSERT(reporter, parentPWB.willPlayBackBitmaps()); // 1
+
+    SkPicture parentWBP;
+    canvas = parentWBP.beginRecording(10, 10);
+    canvas->drawBitmap(bm, 0, 0);
+    canvas->drawPicture(childPlain);
+    parentWBP.endRecording();
+    REPORTER_ASSERT(reporter, parentWBP.willPlayBackBitmaps()); // 1
+
+    SkPicture parentWBWB;
+    canvas = parentWBWB.beginRecording(10, 10);
+    canvas->drawBitmap(bm, 0, 0);
+    canvas->drawPicture(childWithBitmap);
+    parentWBWB.endRecording();
+    REPORTER_ASSERT(reporter, parentWBWB.willPlayBackBitmaps()); // 2
+}
+
 static void TestPicture(skiatest::Reporter* reporter) {
 #ifdef SK_DEBUG
     test_deleting_empty_playback();
@@ -620,6 +664,7 @@ static void TestPicture(skiatest::Reporter* reporter) {
     test_clone_empty(reporter);
     test_clip_bound_opt(reporter);
     test_clip_expansion(reporter);
+    test_hierarchical(reporter);
 }
 
 #include "TestClassDef.h"