Home | History | Annotate | Download | only in skia 
      1 /*
      2  * Copyright (c) 2006,2007,2008, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef BitmapImageSingleFrameSkia_h
     32 #define BitmapImageSingleFrameSkia_h
     33 
     34 #include "Image.h"
     35 #include "NativeImageSkia.h"
     36 
     37 namespace WebCore {
     38 
     39 // This image class can be used in places which need an Image, but have
     40 // raw pixel data rather than undecoded image data.
     41 // The Image is simpler than a BitmapImage, as it does not have image
     42 // observers, animation, multiple frames, or non-decoded data.
     43 // Therefore trimming the decoded data (destroyDecodedData()) has no effect.
     44 //
     45 // The difficulty with putting this in BitmapImage::create(NativeImagePtr)
     46 // is that NativeImagePtr = NativeImageSkia, yet callers have SkBitmap.
     47 class BitmapImageSingleFrameSkia : public Image {
     48 public:
     49     // Creates a new Image, by copying the pixel values out of |bitmap|.
     50     // If creation failed, returns null.
     51     static PassRefPtr<BitmapImageSingleFrameSkia> create(const SkBitmap&);
     52 
     53     virtual bool isBitmapImage() const { return true; }
     54 
     55     virtual IntSize size() const
     56     {
     57         return IntSize(m_nativeImage.width(), m_nativeImage.height());
     58     }
     59 
     60     // Do nothing, as we only have the one representation of data (decoded).
     61     virtual void destroyDecodedData(bool destroyAll = true) { }
     62 
     63     virtual unsigned decodedSize() const
     64     {
     65         return m_nativeImage.decodedSize();
     66     }
     67 
     68     // We only have a single frame.
     69     virtual NativeImagePtr nativeImageForCurrentFrame()
     70     {
     71         return &m_nativeImage;
     72     }
     73 
     74 protected:
     75     virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace styleColorSpace, CompositeOperator);
     76 
     77 private:
     78     NativeImageSkia m_nativeImage;
     79 
     80     // Use create().
     81     BitmapImageSingleFrameSkia() { }
     82 };
     83 
     84 } // namespace WebCore
     85 
     86 #endif  // BitmapImageSingleFrameSkia_h
     87