add SkImage::newSurface

gm/surface.cpp

Index: gm/surface.cpp
diff --git a/gm/surface.cpp b/gm/surface.cpp
index dbcced2cbfabf4d4282fd64c85d270279cbaf383..d17c1e98dc4b2e938e509efe1a9808c5fc823c3b 100644
--- a/gm/surface.cpp
+++ b/gm/surface.cpp
@@ -105,5 +105,46 @@ protected:
 private:
     typedef GM INHERITED;
 };
-
 DEF_GM( return new SurfacePropsGM )
+
+
+class NewSurfaceGM : public skiagm::GM {
+public:
+    NewSurfaceGM() {}
+
+protected:
+    SkString onShortName() SK_OVERRIDE {
+        return SkString("surfacenew");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(300, 140);
+    }
+
+    static void drawInto(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorRED);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
+        SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
+
+        SkAutoTUnref<SkSurface> surf(canvas->newSurface(info, &props));

[reed2, 2014/11/20 01:50:58]

Should just pass NULL for this props. Then we can use surf->surfaceProps() to
know what to pass to image->newSurface..

[reed1, 2014/11/20 19:00:18]

Done.

+        if (!surf.get()) return;

[reed2, 2014/11/20 01:56:54]

need to call newraster, or disable pictures during DM... or decide that canvas
should just return raster when it is backed by picture?

[reed1, 2014/11/20 19:00:19]

Done.

+        drawInto(surf->getCanvas());
+
+        SkAutoTUnref<SkImage> image(surf->newImageSnapshot());
+        canvas->drawImage(image, 10, 10, NULL);
+
+        SkAutoTUnref<SkSurface> surf2(image->newSurface(info, props));
+        drawInto(surf2->getCanvas());
+
+        SkAutoTUnref<SkImage> image2(surf2->newImageSnapshot());
+        canvas->drawImage(image2, 10 + image->width() + 10, 10, NULL);
+    }
+
+private:
+    typedef GM INHERITED;
+};
+DEF_GM( return new NewSurfaceGM )
+