SkPDF: Simplify PDFStream / emitObject() const

src/pdf/SkPDFBitmap.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 "SkColorPriv.h"
 #include "SkData.h"
 #include "SkDeflate.h"
@@ skipping 231 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace {
 // This SkPDFObject only outputs the alpha layer of the given bitmap.
 class PDFAlphaBitmap : public SkPDFObject {
 public:
     PDFAlphaBitmap(const SkBitmap& bm) : fBitmap(bm) {}
     ~PDFAlphaBitmap() {}
     void emitObject(SkWStream*,
                     const SkPDFObjNumMap&,
-                    const SkPDFSubstituteMap&) override;
+                    const SkPDFSubstituteMap&) const override;
 
 private:
     const SkBitmap fBitmap;
 };
 
 void PDFAlphaBitmap::emitObject(SkWStream* stream,
                                 const SkPDFObjNumMap& objNumMap,
-                                const SkPDFSubstituteMap& substitutes) {
+                                const SkPDFSubstituteMap& substitutes) const {
     SkAutoLockPixels autoLockPixels(fBitmap);
     SkASSERT(fBitmap.colorType() != kIndex_8_SkColorType ||
              fBitmap.getColorTable());
 
     // Write to a temporary buffer to get the compressed length.
     SkDynamicMemoryWStream buffer;
     SkDeflateWStream deflateWStream(&buffer);
     bitmap_alpha_to_a8(fBitmap, &deflateWStream);
     deflateWStream.finalize();  // call before detachAsStream().
     SkAutoTDelete<SkStreamAsset> asset(buffer.detachAsStream());
@@ skipping 15 matching lines @@
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace {
 class PDFDefaultBitmap : public SkPDFBitmap {
 public:
     const SkAutoTUnref<SkPDFObject> fSMask;
     void emitObject(SkWStream*,
                     const SkPDFObjNumMap&,
-                    const SkPDFSubstituteMap&) override;
+                    const SkPDFSubstituteMap&) const override;
     void addResources(SkPDFObjNumMap*,
                       const SkPDFSubstituteMap&) const override;
     PDFDefaultBitmap(const SkBitmap& bm, SkPDFObject* smask)
         : SkPDFBitmap(bm), fSMask(smask) {}
 };
 }  // namespace
 
 void PDFDefaultBitmap::addResources(
         SkPDFObjNumMap* catalog,
         const SkPDFSubstituteMap& substitutes) const {
@@ skipping 31 matching lines @@
         pmcolor_to_rgb24(colors[i], tablePtr);
         tablePtr += 3;
     }
     SkString tableString(tableArray, 3 * table->count());
     result->appendString(tableString);
     return result;
 }
 
 void PDFDefaultBitmap::emitObject(SkWStream* stream,
                                   const SkPDFObjNumMap& objNumMap,
-                                  const SkPDFSubstituteMap& substitutes) {
+                                  const SkPDFSubstituteMap& substitutes) const {
     SkAutoLockPixels autoLockPixels(fBitmap);
     SkASSERT(fBitmap.colorType() != kIndex_8_SkColorType ||
              fBitmap.getColorTable());
 
     // Write to a temporary buffer to get the compressed length.
     SkDynamicMemoryWStream buffer;
     SkDeflateWStream deflateWStream(&buffer);
     bitmap_to_pdf_pixels(fBitmap, &deflateWStream);
     deflateWStream.finalize();  // call before detachAsStream().
     SkAutoTDelete<SkStreamAsset> asset(buffer.detachAsStream());
@@ skipping 41 matching lines @@
  *  Jpeg-encoded data that can be directly embedded into a PDF.
  */
 class PDFJpegBitmap : public SkPDFBitmap {
 public:
     SkAutoTUnref<SkData> fData;
     bool fIsYUV;
     PDFJpegBitmap(const SkBitmap& bm, SkData* data, bool isYUV)
         : SkPDFBitmap(bm), fData(SkRef(data)), fIsYUV(isYUV) {}
     void emitObject(SkWStream*,
                     const SkPDFObjNumMap&,
-                    const SkPDFSubstituteMap&) override;
+                    const SkPDFSubstituteMap&) const override;
 };
 
 void PDFJpegBitmap::emitObject(SkWStream* stream,
                                const SkPDFObjNumMap& objNumMap,
-                               const SkPDFSubstituteMap& substituteMap) {
+                               const SkPDFSubstituteMap& substituteMap) const {
     SkPDFDict pdfDict("XObject");
     pdfDict.insertName("Subtype", "Image");
     pdfDict.insertInt("Width", fBitmap.width());
     pdfDict.insertInt("Height", fBitmap.height());
     if (fIsYUV) {
         pdfDict.insertName("ColorSpace", "DeviceRGB");
     } else {
         pdfDict.insertName("ColorSpace", "DeviceGray");
     }
     pdfDict.insertInt("BitsPerComponent", 8);
@@ skipping 38 matching lines @@
     }
 
     SkPDFObject* smask = NULL;
     if (!bm.isOpaque() && !SkBitmap::ComputeIsOpaque(bm)) {
         smask = SkNEW_ARGS(PDFAlphaBitmap, (bm));
     }
     SkPDFBitmap* pdfBitmap = SkNEW_ARGS(PDFDefaultBitmap, (bm, smask));
     canon->addBitmap(pdfBitmap);
     return pdfBitmap;
 }