DM: fix `--config $VIA-pdf` to not crash

dm/DMSrcSink.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 "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkAndroidCodec.h"
@@ skipping 974 matching lines @@
     SkCanvas canvas(*dst);
     return src.draw(&canvas);
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 // Handy for front-patching a Src.  Do whatever up-front work you need, then call draw_to_canvas(),
 // passing the Sink draw() arguments, a size, and a function draws into an SkCanvas.
 // Several examples below.
 
-static Error draw_to_canvas(Sink* sink, SkBitmap* bitmap, SkWStream* stream, SkString* log,
+static Error draw_to_canvas(Name name, Sink* sink, SkBitmap* bitmap, SkWStream* stream, SkString* log,
                             SkISize size, std::function<Error(SkCanvas*)> draw) {
     class ProxySrc : public Src {
     public:
-        ProxySrc(SkISize size, std::function<Error(SkCanvas*)> draw) : fSize(size), fDraw(draw) {}
+        ProxySrc(SkISize size, Name name, std::function<Error(SkCanvas*)> draw)
+            : fSize(size), fName(name), fDraw(draw) {}
         Error   draw(SkCanvas* canvas) const override { return fDraw(canvas); }
-        Name                    name() const override { sk_throw(); return ""; } // Won't be called.
+        Name                    name() const override { return fName; }
         SkISize                 size() const override { return fSize; }
     private:
         SkISize                         fSize;
+        Name fName;
         std::function<Error(SkCanvas*)> fDraw;
     };
-    return sink->draw(ProxySrc(size, draw), bitmap, stream, log);
+    return sink->draw(ProxySrc(size, name, draw), bitmap, stream, log);
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 static SkISize auto_compute_translate(SkMatrix* matrix, int srcW, int srcH) {
     SkRect bounds = SkRect::MakeIWH(srcW, srcH);
     matrix->mapRect(&bounds);
     matrix->postTranslate(-bounds.x(), -bounds.y());
     return SkISize::Make(SkScalarRoundToInt(bounds.width()), SkScalarRoundToInt(bounds.height()));
 }
 
-ViaMatrix::ViaMatrix(SkMatrix matrix, Sink* sink) : Via(sink), fMatrix(matrix) {}
+ViaMatrix::ViaMatrix(Name name, SkMatrix matrix, Sink* sink) : Via(name, sink), fMatrix(matrix) {}
 
 Error ViaMatrix::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     SkMatrix matrix = fMatrix;
     SkISize size = auto_compute_translate(&matrix, src.size().width(), src.size().height());
-    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
         canvas->concat(matrix);
         return src.draw(canvas);
     });
 }
 
 // Undoes any flip or 90 degree rotate without changing the scale of the bitmap.
 // This should be pixel-preserving.
-ViaUpright::ViaUpright(SkMatrix matrix, Sink* sink) : Via(sink), fMatrix(matrix) {}
+ViaUpright::ViaUpright(Name name, SkMatrix matrix, Sink* sink) : Via(name, sink), fMatrix(matrix) {}
 
 Error ViaUpright::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     Error err = fSink->draw(src, bitmap, stream, log);
     if (!err.isEmpty()) {
         return err;
     }
 
     SkMatrix inverse;
     if (!fMatrix.rectStaysRect() || !fMatrix.invert(&inverse)) {
         return "Cannot upright --matrix.";
@@ skipping 16 matching lines @@
 
     *bitmap = uprighted;
     bitmap->lockPixels();
     return "";
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 Error ViaPipe::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     auto size = src.size();
-    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
         PipeController controller(canvas, &SkImageDecoder::DecodeMemory);
         SkGPipeWriter pipe;
         const uint32_t kFlags = 0;
         return src.draw(pipe.startRecording(&controller, kFlags, size.width(), size.height()));
     });
 }
 
 Error ViaRemote::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
-    return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* target) {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, src.size(), [&](SkCanvas* target) {
         SkAutoTDelete<SkRemote::Encoder> decoder(SkRemote::NewDecoder(target));
         SkAutoTDelete<SkRemote::Encoder>   cache(fCache ? SkRemote::NewCachingEncoder(decoder)
                                                         : nullptr);
         SkAutoTDelete<SkCanvas> canvas(SkRemote::NewCanvas(cache ? cache : decoder));
         return src.draw(canvas);
     });
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 Error ViaSerialization::draw(
         const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     // Record our Src into a picture.
     auto size = src.size();
     SkPictureRecorder recorder;
     Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
                                                  SkIntToScalar(size.height())));
     if (!err.isEmpty()) {
         return err;
     }
     SkAutoTUnref<SkPicture> pic(recorder.endRecording());
 
     // Serialize it and then deserialize it.
     SkDynamicMemoryWStream wStream;
     pic->serialize(&wStream);
     SkAutoTDelete<SkStream> rStream(wStream.detachAsStream());
     SkAutoTUnref<SkPicture> deserialized(SkPicture::CreateFromStream(rStream, &lazy_decode_bitmap));
+    Name name = this->decorateName(src);
 
-    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
+    return draw_to_canvas(name, fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
         canvas->drawPicture(deserialized);
         return "";
     });
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
-ViaTiles::ViaTiles(int w, int h, SkBBHFactory* factory, Sink* sink)
-    : Via(sink)
+ViaTiles::ViaTiles(Name name, int w, int h, SkBBHFactory* factory, Sink* sink)
+    : Via(name, sink)
     , fW(w)
     , fH(h)
     , fFactory(factory) {}
 
 Error ViaTiles::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     auto size = src.size();
     SkPictureRecorder recorder;
     Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
                                                  SkIntToScalar(size.height()),
                                                  fFactory.get()));
     if (!err.isEmpty()) {
         return err;
     }
     SkAutoTUnref<SkPicture> pic(recorder.endRecordingAsPicture());
+    Name name = this->decorateName(src);
 
-    return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) {
+    return draw_to_canvas(name, fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) {
         const int xTiles = (size.width()  + fW - 1) / fW,
                   yTiles = (size.height() + fH - 1) / fH;
         SkMultiPictureDraw mpd(xTiles*yTiles);
         SkTDArray<SkSurface*> surfaces;
         surfaces.setReserve(xTiles*yTiles);
 
         SkImageInfo info = canvas->imageInfo().makeWH(fW, fH);
         for (int j = 0; j < yTiles; j++) {
             for (int i = 0; i < xTiles; i++) {
                 // This lets our ultimate Sink determine the best kind of surface.
@@ skipping 21 matching lines @@
     });
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 // Draw the Src into two pictures, then draw the second picture into the wrapped Sink.
 // This tests that any shortcuts we may take while recording that second picture are legal.
 Error ViaSecondPicture::draw(
         const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     auto size = src.size();
-    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
         SkPictureRecorder recorder;
         SkAutoTUnref<SkPicture> pic;
         for (int i = 0; i < 2; i++) {
             Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
                                                          SkIntToScalar(size.height())));
             if (!err.isEmpty()) {
                 return err;
             }
             pic.reset(recorder.endRecordingAsPicture());
         }
         canvas->drawPicture(pic);
         return "";
     });
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
 // Draw the Src twice.  This can help exercise caching.
 Error ViaTwice::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
-    return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) -> Error {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) -> Error {
         for (int i = 0; i < 2; i++) {
             SkAutoCanvasRestore acr(canvas, true/*save now*/);
             canvas->clear(SK_ColorTRANSPARENT);
             Error err = src.draw(canvas);
             if (err.isEmpty()) {
                 return err;
             }
         }
         return "";
     });
@@ skipping 31 matching lines @@
     skstd::enable_if_t<!(T::kTags & SkRecords::kDraw_Tag), void> operator()(const T& op) {
         this->draw(op, fCanvas);
     }
 };
 
 // Record Src into a picture, then record it into a macro picture with a sub-picture for each draw.
 // Then play back that macro picture into our wrapped sink.
 Error ViaSingletonPictures::draw(
         const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
     auto size = src.size();
-    return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
+    Name name = this->decorateName(src);
+    return draw_to_canvas(name, fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
         // Use low-level (Skia-private) recording APIs so we can read the SkRecord.
         SkRecord skr;
         SkRecorder recorder(&skr, size.width(), size.height());
         Error err = src.draw(&recorder);
         if (!err.isEmpty()) {
             return err;
         }
 
         // Record our macro-picture, with each draw op as its own sub-picture.
         SkPictureRecorder macroRec;
@@ skipping 11 matching lines @@
             skr.visit<void>(i, drawsAsSingletonPictures);
         }
         SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
 
         canvas->drawPicture(macroPic);
         return "";
     });
 }
 
 }  // namespace DM