skia2/include/pdf/SkPDFImage.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SkPDFImage_DEFINED
#define SkPDFImage_DEFINED

#include "SkPDFStream.h"
#include "SkPDFTypes.h"
#include "SkRefCnt.h"

class SkBitmap;
class SkPaint;
class SkPDFCatalog;
struct SkIRect;

/** \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 SkPDFObject {
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,
                                   const SkPaint& paint);

    virtual ~SkPDFImage();

    /** Add a Soft Mask (alpha or shape channel) to the image.  Refs mask.
     *  @param mask A gray scale image representing the mask.
     *  @return The mask argument is returned.
     */
    SkPDFImage* addSMask(SkPDFImage* mask);

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
    virtual void getResources(SkTDArray<SkPDFObject*>* resourceList);

private:
    SkRefPtr<SkPDFStream> fStream;
    SkTDArray<SkPDFObject*> fResources;

    /** Create a PDF image XObject. Entries for the image properties are
     *  automatically added to the stream dictionary.
     *  @param imageData  The final raw bits representing the image.
     *  @param bitmap     The image parameters to use (Config, etc).
     *  @param srcRect    The clipping applied to bitmap before generating
     *                    imageData.
     *  @param alpha      Is this the alpha channel of the bitmap.
     *  @param paint      Used to calculate alpha, masks, etc.
     */
    SkPDFImage(SkStream* imageData, const SkBitmap& bitmap,
               const SkIRect& srcRect, bool alpha, const SkPaint& paint);

    /** Add the value to the stream dictionary with the given key.  Refs value.
     *  @param key   The key for this dictionary entry.
     *  @param value The value for this dictionary entry.
     *  @return The value argument is returned.
     */
    SkPDFObject* insert(SkPDFName* key, SkPDFObject* value);

    /** Add the value to the stream dictionary with the given key.  Refs value.
     *  @param key   The text of the key for this dictionary entry.
     *  @param value The value for this dictionary entry.
     *  @return The value argument is returned.
     */
    SkPDFObject* insert(const char key[], SkPDFObject* value);
};

#endif