Added SkImage::MakeCrossContextFromEncoded

Designed for Flutter's threading architecture, with
an eye to being useful to other clients. Under the
hood, uses a new image generator class to lazily wrap
a texture for multiple GrContexts.

Bug: skia:
Change-Id: I6c37b12c8ab5bce94b91190e5f0beb91d31ae81b
Reviewed-on: https://skia-review.googlesource.com/14180
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/gm/crosscontextimage.cpp b/gm/crosscontextimage.cpp
new file mode 100644
index 0000000000..cf973dbe61
--- /dev/null
+++ b/gm/crosscontextimage.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "Resources.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#include "SkImage.h"
+
+DEF_SIMPLE_GM(cross_context_image, canvas, 512 + 512 + 30, 512 + 128 + 30) {
+    GrContext* context = canvas->getGrContext();
+    if (!context) {
+        skiagm::GM::DrawGpuOnlyMessage(canvas);
+        return;
+    }
+
+    sk_sp<SkData> encodedData = GetResourceAsData("mandrill_512.png");
+
+    sk_sp<SkImage> encodedImage = SkImage::MakeFromEncoded(encodedData);
+    canvas->drawImage(encodedImage, 10, 10);
+
+    sk_sp<SkImage> crossContextImage = SkImage::MakeCrossContextFromEncoded(
+        context, encodedData, false, canvas->imageInfo().colorSpace());
+    canvas->drawImage(crossContextImage, 512 + 30, 10);
+
+    SkIRect subset = SkIRect::MakeXYWH(256 - 64, 256 - 64, 128, 128);
+    sk_sp<SkImage> encodedSubset = encodedImage->makeSubset(subset);
+    sk_sp<SkImage> crossContextSubset = crossContextImage->makeSubset(subset);
+
+    canvas->drawImage(encodedSubset, 10, 512 + 30);
+    canvas->drawImage(crossContextSubset, 512 + 30, 512 + 30);
+}
+
+#endif