Create a factory to decode an SkBitmap from an SkData.

Add a test and a GM for the factory, and a PNG file for it to decode.
The PNG file is copyright-free, obtained from
http://openclipart.org/detail/29213/paper-plane-by-ddoo

In cmykjpeg, do not attempt to decode in the constructor, since it
currently crashes on Mac (if you provide the correct resource path).
Even when we fix this crash there is no need to do it in the
constructor, since we create all of the gms in order to
get their names (to determine whether to run them).

Review URL: https://codereview.appspot.com/6847122

git-svn-id: http://skia.googlecode.com/svn/trunk@6618 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 76 insertions, 0 deletions

diff --git a/tests/BitmapFactoryTest.cpp b/tests/BitmapFactoryTest.cpp
new file mode 100644
index 0000000000..b24fd258ca
--- /dev/null
+++ b/tests/BitmapFactoryTest.cpp
@@ -0,0 +1,76 @@
+
+/*
+ * 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 "SkBitmap.h"
+#include "SkBitmapFactory.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkData.h"
+#include "SkImageEncoder.h"
+#include "SkPaint.h"
+#include "SkStream.h"
+#include "SkTemplates.h"
+#include "Test.h"
+
+static SkBitmap* create_bitmap() {
+    SkBitmap* bm = SkNEW(SkBitmap);
+    const int W = 100, H = 100;
+    bm->setConfig(SkBitmap::kARGB_8888_Config, W, H);
+    bm->allocPixels();
+    bm->eraseColor(SK_ColorBLACK);
+    SkCanvas canvas(*bm);
+    SkPaint paint;
+    paint.setColor(SK_ColorBLUE);
+    canvas.drawRectCoords(0, 0, SkIntToScalar(W/2), SkIntToScalar(H/2), paint);
+    return bm;
+}
+
+static SkData* create_data_from_bitmap(const SkBitmap& bm) {
+    SkDynamicMemoryWStream stream;
+    if (SkImageEncoder::EncodeStream(&stream, bm, SkImageEncoder::kPNG_Type, 100)) {
+        return stream.copyToData();
+    }
+    return NULL;
+}
+
+static void assert_bounds_equal(skiatest::Reporter* reporter, const SkBitmap& bm1,
+                                const SkBitmap& bm2) {
+    REPORTER_ASSERT(reporter, bm1.width() == bm2.width());
+    REPORTER_ASSERT(reporter, bm1.height() == bm2.height());
+}
+
+static void TestBitmapFactory(skiatest::Reporter* reporter) {
+    SkAutoTDelete<SkBitmap> bitmap(create_bitmap());
+    SkASSERT(bitmap.get() != NULL);
+
+    SkAutoDataUnref encodedBitmap(create_data_from_bitmap(*bitmap.get()));
+    if (encodedBitmap.get() == NULL) {
+        // Encoding failed.
+        return;
+    }
+
+    SkBitmap bitmapFromFactory;
+    bool success = SkBitmapFactory::DecodeBitmap(&bitmapFromFactory, encodedBitmap);
+    // This assumes that if the encoder worked, the decoder should also work, so the above call
+    // should not fail.
+    REPORTER_ASSERT(reporter, success);
+    assert_bounds_equal(reporter, *bitmap.get(), bitmapFromFactory);
+    REPORTER_ASSERT(reporter, bitmapFromFactory.pixelRef() != NULL);
+
+    // When only requesting that the bounds be decoded, the bounds should be set properly while
+    // the pixels should be empty.
+    SkBitmap boundedBitmap;
+    success = SkBitmapFactory::DecodeBitmap(&boundedBitmap, encodedBitmap,
+                                            SkBitmapFactory::kDecodeBoundsOnly_Constraint);
+    REPORTER_ASSERT(reporter, success);
+    assert_bounds_equal(reporter, *bitmap.get(), boundedBitmap);
+    REPORTER_ASSERT(reporter, boundedBitmap.pixelRef() == NULL);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("BitmapFactory", TestBitmapFactoryClass, TestBitmapFactory)