1 2 /* 3 * Copyright 2010 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkPDFImage_DEFINED 11 #define SkPDFImage_DEFINED 12 13 #include "SkPicture.h" 14 #include "SkPDFDevice.h" 15 #include "SkPDFStream.h" 16 #include "SkPDFTypes.h" 17 #include "SkRefCnt.h" 18 19 class SkBitmap; 20 class SkPDFCatalog; 21 struct SkIRect; 22 23 /** \class SkPDFImage 24 25 An image XObject. 26 */ 27 28 // We could play the same trick here as is done in SkPDFGraphicState, storing 29 // a copy of the Bitmap object (not the pixels), the pixel generation number, 30 // and settings used from the paint to canonicalize image objects. 31 class SkPDFImage : public SkPDFStream { 32 public: 33 /** Create a new Image XObject to represent the passed bitmap. 34 * @param bitmap The image to encode. 35 * @param srcRect The rectangle to cut out of bitmap. 36 * @param paint Used to calculate alpha, masks, etc. 37 * @return The image XObject or NUll if there is nothing to draw for 38 * the given parameters. 39 */ 40 static SkPDFImage* CreateImage(const SkBitmap& bitmap, 41 const SkIRect& srcRect, 42 SkPicture::EncodeBitmap encoder); 43 44 virtual ~SkPDFImage(); 45 46 /** Add a Soft Mask (alpha or shape channel) to the image. Refs mask. 47 * @param mask A gray scale image representing the mask. 48 * @return The mask argument is returned. 49 */ 50 SkPDFImage* addSMask(SkPDFImage* mask); 51 52 bool isEmpty() { 53 return fSrcRect.isEmpty(); 54 } 55 56 // The SkPDFObject interface. 57 virtual void getResources(const SkTSet<SkPDFObject*>& knownResourceObjects, 58 SkTSet<SkPDFObject*>* newResourceObjects); 59 60 private: 61 SkBitmap fBitmap; 62 bool fIsAlpha; 63 SkIRect fSrcRect; 64 SkPicture::EncodeBitmap fEncoder; 65 bool fStreamValid; 66 67 SkTDArray<SkPDFObject*> fResources; 68 69 /** Create a PDF image XObject. Entries for the image properties are 70 * automatically added to the stream dictionary. 71 * @param stream The image stream. May be NULL. Otherwise, this 72 * (instead of the input bitmap) will be used as the 73 * PDF's content stream, possibly with lossless encoding. 74 * @param bitmap The image. If a stream is not given, its color data 75 * will be used as the image. If a stream is given, this 76 * is used for configuration only. 77 * @param isAlpha Whether or not this is the alpha of an image. 78 * @param srcRect The clipping applied to bitmap before generating 79 * imageData. 80 * @param encoder A function used to encode the bitmap for compression. 81 * May be NULL. 82 */ 83 SkPDFImage(SkStream* stream, const SkBitmap& bitmap, bool isAlpha, 84 const SkIRect& srcRect, SkPicture::EncodeBitmap encoder); 85 86 /** Copy constructor, used to generate substitutes. 87 * @param image The SkPDFImage to copy. 88 */ 89 SkPDFImage(SkPDFImage& pdfImage); 90 91 // Populate the stream dictionary. This method returns false if 92 // fSubstitute should be used. 93 virtual bool populate(SkPDFCatalog* catalog); 94 95 typedef SkPDFStream INHERITED; 96 }; 97 98 #endif 99
