pdf: report NYI features, and fail gracefully when something is not supported in pdf.

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotation.h"
@@ skipping 614 matching lines @@
     ContentEntry* entry() { return fContentEntry; }
 private:
     SkPDFDevice* fDevice;
     ContentEntry* fContentEntry;
     SkXfermode::Mode fXfermode;
     SkPDFFormXObject* fDstFormXObject;
 
     void init(const SkClipStack* clipStack, const SkRegion& clipRegion,
               const SkMatrix& matrix, const SkPaint& paint, bool hasText) {
         fDstFormXObject = NULL;
+        if (matrix.hasPerspective() ||
+                (paint.getShader() &&
+                 paint.getShader()->getLocalMatrix().hasPerspective())) {
+            // Just report that PDF does not supports perspective
+            // TODO(edisonn): update the shape when possible
+            // or dump in an image otherwise
+            NOT_IMPLEMENTED(true, false);
+            return;
+        }
+
         if (paint.getXfermode()) {
             paint.getXfermode()->asMode(&fXfermode);
         }
         fContentEntry = fDevice->setUpContentEntry(clipStack, clipRegion,
                                                    matrix, paint, hasText,
                                                    &fDstFormXObject);
     }
 };
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 27 matching lines @@
 // TODO(vandebo) change pageSize to SkSize.
 SkPDFDevice::SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize,
                          const SkMatrix& initialTransform)
     : SkBitmapDevice(makeContentBitmap(contentSize, &initialTransform)),
       fPageSize(pageSize),
       fContentSize(contentSize),
       fLastContentEntry(NULL),
       fLastMarginContentEntry(NULL),
       fClipStack(NULL),
       fEncoder(NULL) {
+    // just report that PDF does not supports perspective
+    // TODO(edisonn): update the shape when possible
+    // or dump in an image otherwise
+    NOT_IMPLEMENTED(initialTransform.hasPerspective(), true);
+
     // Skia generally uses the top left as the origin but PDF natively has the
     // origin at the bottom left. This matrix corrects for that.  But that only
     // needs to be done once, we don't do it when layering.
     fInitialTransform.setTranslate(0, SkIntToScalar(pageSize.fHeight));
     fInitialTransform.preScale(SK_Scalar1, -SK_Scalar1);
     fInitialTransform.preConcat(initialTransform);
 
     SkIRect existingClip = SkIRect::MakeWH(this->width(), this->height());
     fExistingClipRegion.setRect(existingClip);
 
@@ skipping 216 matching lines @@
     SkMatrix matrix = *d.fMatrix;
     if (prePathMatrix) {
         if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
             if (!pathIsMutable) {
                 pathPtr = &modifiedPath;
                 pathIsMutable = true;
             }
             origPath.transform(*prePathMatrix, pathPtr);
         } else {
             if (!matrix.preConcat(*prePathMatrix)) {
+                // TODO(edisonn): report somehow why we failed?
                 return;
             }
         }
     }
 
     if (paint.getPathEffect()) {
         if (d.fClip->isEmpty()) {
             return;
         }
         if (!pathIsMutable) {
@@ skipping 994 matching lines @@
 }
 
 bool SkPDFDevice::onReadPixels(const SkBitmap& bitmap, int x, int y,
                                SkCanvas::Config8888) {
     return false;
 }
 
 bool SkPDFDevice::allowImageFilter(SkImageFilter*) {
     return false;
 }