move responsibility for creating raster-device into 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 "SkAnnotationKeys.h"
+#include "SkBitmapDevice.h"
 #include "SkBitmapKey.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
 #include "SkDraw.h"
 #include "SkGlyphCache.h"
 #include "SkPath.h"
 #include "SkPathEffect.h"
 #include "SkPathOps.h"
 #include "SkPDFBitmap.h"
 #include "SkPDFCanon.h"
@@ skipping 516 matching lines @@
     // printer resolution.
     // TODO: It may be possible to express some filters natively using PDF
     // to improve quality and file size (https://bug.skia.org/3043)
 
     // TODO: should we return true if there is a colorfilter?
     return layerPaint.getImageFilter() != nullptr;
 }
 
 SkBaseDevice* SkPDFDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
     if (layerPaint && not_supported_for_layers(*layerPaint)) {
-        return nullptr;
+        // need to return a raster device, which we will detect in drawDevice()
+        return SkBitmapDevice::Create(cinfo.fInfo, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
     }
     SkISize size = SkISize::Make(cinfo.fInfo.width(), cinfo.fInfo.height());
     return SkPDFDevice::Create(size, fRasterDpi, fDocument);
 }
 
 SkPDFCanon* SkPDFDevice::getCanon() const { return fDocument->canon(); }
 
 
 
 // A helper class to automatically finish a ContentEntry at the end of a
@@ skipping 706 matching lines @@
                                SkXfermode* xmode, const uint16_t indices[],
                                int indexCount, const SkPaint& paint) {
     if (d.fRC->isEmpty()) {
         return;
     }
     // TODO: implement drawVertices
 }
 
 void SkPDFDevice::drawDevice(const SkDraw& d, SkBaseDevice* device,
                              int x, int y, const SkPaint& paint) {
+    // Check if the source device is really a bitmapdevice (because that's what we returned
+    // from createDevice (likely due to an imagefilter)
+    SkPixmap pmap;
+    if (device->peekPixels(&pmap)) {
+        SkBitmap bitmap;
+        bitmap.installPixels(pmap);
+        if (paint.getImageFilter()) {
+            this->drawSpriteWithFilter(d, bitmap, x, y, paint);
+        } else {
+            this->drawSprite(d, bitmap, x, y, paint);
+        }
+        return;
+    }
+
     // our onCreateCompatibleDevice() always creates SkPDFDevice subclasses.
     SkPDFDevice* pdfDevice = static_cast<SkPDFDevice*>(device);
 
     SkScalar scalarX = SkIntToScalar(x);
     SkScalar scalarY = SkIntToScalar(y);
     for (const RectWithData& l : pdfDevice->fLinkToURLs) {
         SkRect r = l.rect.makeOffset(scalarX, scalarY);
         fLinkToURLs.emplace_back(r, l.data.get());
     }
     for (const RectWithData& l : pdfDevice->fLinkToDestinations) {
@@ skipping 837 matching lines @@
         if (!pdfimage) {
             return;
         }
         fDocument->serialize(pdfimage);  // serialize images early.
         fDocument->canon()->addPDFBitmap(key, pdfimage);
     }
     // TODO(halcanary): addXObjectResource() should take a sk_sp<SkPDFObject>
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
                                 &content.entry()->fContent);
 }