DM: JSON Debug Sink

Currently, the following GMs crash the debug canvas:
    ~dont_clip_to_layer
    ~imageblur
    ~imagefilterscropped
    ~pictureimagefilter
    ~savelayer_lcdtext
    ~textfilter_image
// TODO(halcanary): fix this.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3742

Change-Id: Ieed3502119cd639fe345f3a41d436d5e39f3bdf1
Reviewed-on: https://skia-review.googlesource.com/3742
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Hal Canary <halcanary@google.com>

3 files changed, 25 insertions, 0 deletions

diff --git a/dm/DM.cpp b/dm/DM.cpp
index 36808ad168..42922c2c0b 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -883,6 +883,7 @@ static Sink* create_sink(const SkCommandLineConfig* config) {
         SINK("null", NullSink);
         SINK("xps",  XPSSink);
         SINK("pdfa", PDFSink, true);
+        SINK("jsdebug", DebugSink);
     }
 #undef SINK
     return nullptr;
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index 274f7dbe6d..30185a2ab1 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -15,6 +15,7 @@
 #include "SkColorSpaceXform.h"
 #include "SkCommonFlags.h"
 #include "SkData.h"
+#include "SkDebugCanvas.h"
 #include "SkDeferredCanvas.h"
 #include "SkDocument.h"
 #include "SkImageGenerator.h"
@@ -1397,6 +1398,22 @@ Error SKPSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
+Error DebugSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
+    SkDebugCanvas debugCanvas(src.size().width(), src.size().height());
+    Error err = src.draw(&debugCanvas);
+    if (!err.isEmpty()) {
+        return err;
+    }
+    sk_sp<SkCanvas> nullCanvas(SkCreateNullCanvas());
+    UrlDataManager dataManager(SkString("data"));
+    Json::Value json = debugCanvas.toJSON(
+            dataManager, debugCanvas.getSize(), nullCanvas.get());
+    std::string value = Json::StyledWriter().write(json);
+    return dst->write(value.c_str(), value.size()) ? "" : "SkWStream Error";
+}
+
+/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
+
 SVGSink::SVGSink() {}
 
 Error SVGSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
diff --git a/dm/DMSrcSink.h b/dm/DMSrcSink.h
index 4be9878afa..cad15c7e86 100644
--- a/dm/DMSrcSink.h
+++ b/dm/DMSrcSink.h
@@ -374,6 +374,13 @@ public:
     SinkFlags flags() const override { return SinkFlags{ SinkFlags::kVector, SinkFlags::kDirect }; }
 };
 
+class DebugSink : public Sink {
+public:
+    Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
+    const char* fileExtension() const override { return "json"; }
+    SinkFlags flags() const override { return SinkFlags{ SinkFlags::kVector, SinkFlags::kDirect }; }
+};
+
 class SVGSink : public Sink {
 public:
     SVGSink();