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/*
* Copyright 2010 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPDFImage_DEFINED
#define SkPDFImage_DEFINED
#include "SkPicture.h"
#include "SkPDFDevice.h"
#include "SkPDFStream.h"
#include "SkPDFTypes.h"
#include "SkRefCnt.h"
class SkBitmap;
class SkData;
class SkPDFCatalog;
struct SkIRect;
/**
* Return the mose efficient availible encoding of the given bitmap.
*/
SkPDFObject* SkPDFCreateImageObject(SkPDFCanon* canon,
const SkBitmap&,
const SkIRect& subset);
/** \class SkPDFImage
An image XObject.
*/
// We could play the same trick here as is done in SkPDFGraphicState, storing
// a copy of the Bitmap object (not the pixels), the pixel generation number,
// and settings used from the paint to canonicalize image objects.
class SkPDFImage : public SkPDFStream {
public:
/** Create a new Image XObject to represent the passed bitmap.
* @param bitmap The image to encode.
* @param srcRect The rectangle to cut out of bitmap.
* @param paint Used to calculate alpha, masks, etc.
* @return The image XObject or NUll if there is nothing to draw for
* the given parameters.
*/
static SkPDFImage* CreateImage(const SkBitmap& bitmap,
const SkIRect& srcRect);
virtual ~SkPDFImage();
bool isEmpty() {
return fSrcRect.isEmpty();
}
private:
SkBitmap fBitmap;
bool fIsAlpha;
SkIRect fSrcRect;
bool fStreamValid;
/** Create a PDF image XObject. Entries for the image properties are
* automatically added to the stream dictionary.
* @param stream The image stream. May be NULL. Otherwise, this
* (instead of the input bitmap) will be used as the
* PDF's content stream, possibly with lossless encoding.
* Will be duplicated, and left in indeterminate state.
* @param bitmap The image. If a stream is not given, its color data
* will be used as the image. If a stream is given, this
* is used for configuration only.
* @param isAlpha Whether or not this is the alpha of an image.
* @param srcRect The clipping applied to bitmap before generating
* imageData.
*/
SkPDFImage(SkStream* stream, const SkBitmap& bitmap, bool isAlpha,
const SkIRect& srcRect);
/** Copy constructor, used to generate substitutes.
* @param image The SkPDFImage to copy.
*/
SkPDFImage(SkPDFImage& pdfImage);
// Populate the stream dictionary. This method returns false if
// fSubstitute should be used.
virtual bool populate(SkPDFCatalog* catalog);
typedef SkPDFStream INHERITED;
};
#endif
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