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/*
* Copyright (c) 2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Giacomo Travaglini
*/
/**
* @file Declaration of a class that writes a frame buffer to a png
*/
#ifndef __BASE_PNG_HH__
#define __BASE_PNG_HH__
#include "base/compiler.hh"
#include "base/framebuffer.hh"
#include "base/imgwriter.hh"
/** Image writer implementing support for PNG */
class PngWriter : public ImgWriter
{
public:
/**
* Create a png that takes data in a given mode & size and
* outputs to an ostream.
*/
PngWriter(const FrameBuffer *_fb)
: ImgWriter(_fb)
{}
~PngWriter() {};
/**
* Return Image format as a string
*
* @return img extension (e.g. .png for Png)
*/
const char* getImgExtension() const override
{ return _imgExtension; }
/**
* Write the frame buffer data into the provided ostream
*
* @param png stream to write to
*/
void write(std::ostream &png) const override;
private:
/** Png Pixel type: not containing padding */
struct PngPixel24 {
PngPixel24 &operator=(const Pixel &rhs) {
red = rhs.red;
green = rhs.green;
blue = rhs.blue;
return *this;
}
uint8_t red;
uint8_t green;
uint8_t blue;
} M5_ATTR_PACKED;
/**
* Handle to resources used by libpng:
* - png_struct: Structure holding write informations
* - png_info : Structure holding image informations
*
* The class is automatically taking care of struct
* allocation/deallocation
*/
struct PngStructHandle;
typedef PngPixel24 PixelType;
static const char* _imgExtension;
};
#endif // __BASE_PNG_HH__
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