SkCodec: add wbmp class

tests/CodexTest.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Resources.h"
+#include "SkBitmap.h"
+#include "SkCodec.h"
+#include "Test.h"
+
+static SkStreamAsset* resource(const char path[]) {
+    SkString fullPath = GetResourcePath(path);
+    return SkStream::NewFromFile(fullPath.c_str());
+}
+
+static void check(skiatest::Reporter* r,
+                  const char path[],
+                  SkISize size,
+                  bool canRewind) {
+    SkAutoTDelete<SkStream> stream(resource(path));
+    if (!stream) {
+        SkDebugf("Missing resource '%s'\n", path);
+        return;
+    }
+    SkAutoTDelete<SkImageGenerator> gen(
+            SkCodec::NewFromStream(stream.detach()));
+    if (!gen) {
+        ERRORF(r, "Unable to decode '%s'", path);
+        return;
+    }
+    SkImageInfo info = gen->getInfo();
+    if (!size.isZero()) {

[scroggo, 2015/03/26 20:29:45]

is size ever zero? Why? (It doesn't look like it from the callers.) That said,
it seems like info.dimensions() should match or we should not have created an
SkCodec to begin with (I think the latter).

[hal.canary, 2015/03/26 21:46:09]

I didn't know the dimensions of all the files when I first wrote this.  Fixed.

+        REPORTER_ASSERT(r, info.dimensions() == size);
+    }
+    SkBitmap bm;
+    bm.allocPixels(info);
+    SkAutoLockPixels autoLockPixels(bm);
+    SkImageGenerator::Result result =
+        gen->getPixels(info, bm.getPixels(), bm.rowBytes(), NULL, NULL, NULL);
+    REPORTER_ASSERT(r, result == SkImageGenerator::kSuccess);
+
+    result =
+        gen->getPixels(info, bm.getPixels(), bm.rowBytes(), NULL, NULL, NULL);
+
+    // All ImageGenerators should support re-decoding the pixels.  It
+    // is a know bug that some can not.

[scroggo, 2015/03/26 20:29:45]

known*

[hal.canary, 2015/03/26 21:46:09]

Done.

+    if (canRewind) {
+        REPORTER_ASSERT(r, result == SkImageGenerator::kSuccess);
+    }
+}
+
+DEF_TEST(Codec, r) {
+    // WBMP

[scroggo, 2015/03/26 20:29:44]

ICO, too?

[hal.canary, 2015/03/26 21:46:09]

Done.

+    check(r, "mandrill.wbmp", SkISize::Make(512, 512), true);
+
+    // BMP

[scroggo, 2015/03/26 20:29:44]

FIXME (msarett): SkBmpCodec should be able to rewind.

[hal.canary, 2015/03/26 21:46:09]

Done.

+    check(r, "randPixels.bmp", SkISize::Make(8, 8), false);
+
+    // PNG

[scroggo, 2015/03/26 20:29:44]

FIXME (scroggo): SkPngCodec should be able to rewind.

[hal.canary, 2015/03/26 21:46:09]

Done.

+    check(r, "arrow.png", SkISize::Make(187, 312), false);
+    check(r, "baby_tux.png", SkISize::Make(240, 246), false);
+    check(r, "color_wheel.png", SkISize::Make(128, 128), false);
+    check(r, "half-transparent-white-pixel.png", SkISize::Make(1, 1), false);
+    check(r, "mandrill_128.png", SkISize::Make(128, 128), false);
+    check(r, "mandrill_16.png", SkISize::Make(16, 16), false);
+    check(r, "mandrill_256.png", SkISize::Make(256, 256), false);
+    check(r, "mandrill_32.png", SkISize::Make(32, 32), false);
+    check(r, "mandrill_512.png", SkISize::Make(512, 512), false);
+    check(r, "mandrill_64.png", SkISize::Make(64, 64), false);
+    check(r, "plane.png", SkISize::Make(250, 126), false);
+    check(r, "randPixels.png", SkISize::Make(8, 8), false);
+    check(r, "yellow_rose.png", SkISize::Make(400, 301), false);
+}