Change device creation to see the (optional) layer-paint

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 548 matching lines @@
                               enum_must_match_value);
             SK_COMPILE_ASSERT(SkPaint::kStrokeAndFill_Style == 2,
                               enum_must_match_value);
             fContentStream->writeDecAsText(state.fTextFill);
             fContentStream->writeText(" Tr\n");
             currentEntry()->fTextFill = state.fTextFill;
         }
     }
 }
 
-SkBaseDevice* SkPDFDevice::onCreateCompatibleDevice(const CreateInfo& cinfo) {
+static bool not_supported_for_layers(const SkPaint& layerPaint) {
     // PDF does not support image filters, so render them on CPU.
     // Note that this rendering is done at "screen" resolution (100dpi), not
     // printer resolution.
     // FIXME: It may be possible to express some filters natively using PDF
     // to improve quality and file size (http://skbug.com/3043)
-    if (kImageFilter_Usage == cinfo.fUsage) {
+
+    // TODO: should we return true if there is a colorfilter?
+    return layerPaint.getImageFilter() != NULL;
+}
+
+SkBaseDevice* SkPDFDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
+    if (layerPaint && not_supported_for_layers(*layerPaint)) {
         return SkBitmapDevice::Create(cinfo.fInfo);
     }
     SkISize size = SkISize::Make(cinfo.fInfo.width(), cinfo.fInfo.height());
     return SkPDFDevice::Create(size, fRasterDpi, fCanon);
 }
 
 
 struct ContentEntry {
     GraphicStateEntry fState;
     SkDynamicMemoryWStream fContent;
@@ skipping 1544 matching lines @@
 
     SkAutoTUnref<SkPDFObject> image(
             SkPDFCreateImageObject(fCanon, *bitmap, subset));
     if (!image) {
         return;
     }
 
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(image.get()),
                                 &content.entry()->fContent);
 }