don't quickReject bitmaps if there is a looper or other possible bounds-modifier

add unittest for the above change



git-svn-id: http://skia.googlecode.com/svn/trunk@2722 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 80 insertions, 0 deletions

diff --git a/tests/QuickRejectTest.cpp b/tests/QuickRejectTest.cpp
new file mode 100644
index 0000000000..8cde32785a
--- /dev/null
+++ b/tests/QuickRejectTest.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCanvas.h"
+#include "SkDrawLooper.h"
+#include "Test.h"
+
+/*
+ *  Subclass of looper that just draws once, with an offset in X.
+ */
+class TestLooper : public SkDrawLooper {
+public:
+    bool fOnce;
+
+    virtual void init(SkCanvas*) SK_OVERRIDE {
+        fOnce = true;
+    }
+
+    virtual bool next(SkCanvas* canvas, SkPaint*) SK_OVERRIDE {
+        if (fOnce) {
+            fOnce = false;
+            canvas->translate(SkIntToScalar(10), 0);
+            return true;
+        }
+        return false;
+    }
+
+    virtual Factory getFactory() SK_OVERRIDE {
+        return NULL;
+    }
+};
+
+static void test_drawBitmap(skiatest::Reporter* reporter) {
+    SkBitmap src;
+    src.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
+    src.allocPixels();
+    src.eraseColor(SK_ColorWHITE);
+
+    SkBitmap dst;
+    dst.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
+    dst.allocPixels();
+    dst.eraseColor(0);
+
+    SkCanvas canvas(dst);
+    SkPaint  paint;
+
+    // we are initially transparent
+    REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
+
+    // we see the bitmap drawn
+    canvas.drawBitmap(src, 0, 0, &paint);
+    REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
+
+    // reverify we are clear again
+    dst.eraseColor(0);
+    REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
+
+    // if the bitmap is clipped out, we don't draw it
+    canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
+    REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
+
+    // now install our looper, which will draw, since it internally translates
+    // to the left. The test is to ensure that canvas' quickReject machinary
+    // allows us through, even though sans-looper we would look like we should
+    // be clipped out.
+    paint.setLooper(new TestLooper)->unref();
+    canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
+    REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
+}
+
+static void test(skiatest::Reporter* reporter) {
+    test_drawBitmap(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("QuickReject", QuickRejectClass, test)