PDF: support perspective in simple shaders. (this version does not work well with tilling)

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 630 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;
-        }
-
+        // Shape has to be flatten before we get here.
+        NOT_IMPLEMENTED(!matrix.hasPerspective(), false);
         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
+    // Just report that PDF does not supports perspective in the
+    // initial transform.
     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());
@@ skipping 1420 matching lines @@
 }
 
 bool SkPDFDevice::onReadPixels(const SkBitmap& bitmap, int x, int y,
                                SkCanvas::Config8888) {
     return false;
 }
 
 bool SkPDFDevice::allowImageFilter(SkImageFilter*) {
     return false;
 }