pagespeed::image_compression::PngReader Class Reference

Reader for PNG-encoded data. More...

#include "png_optimizer.h"

Inheritance diagram for pagespeed::image_compression::PngReader:

Public Member Functions
	PngReader (MessageHandler *handler)
virtual bool	ReadPng (const GoogleString &body, png_structp png_ptr, png_infop info_ptr, int transforms, bool require_opaque) const
virtual bool	GetAttributes (const GoogleString &body, int *out_width, int *out_height, int *out_bit_depth, int *out_color_type) const
Public Member Functions inherited from pagespeed::image_compression::PngReaderInterface
bool	ReadPng (const GoogleString &body, png_structp png_ptr, png_infop info_ptr, int transforms) const

Additional Inherited Members
Static Public Member Functions inherited from pagespeed::image_compression::PngReaderInterface
static bool	GetBackgroundColor (png_structp png_ptr, png_infop info_ptr, unsigned char *red, unsigned char *green, unsigned char *blue, MessageHandler *handler)
static bool	IsAlphaChannelOpaque (png_structp png_ptr, png_infop info_ptr, MessageHandler *handler)

Detailed Description

Reader for PNG-encoded data.

Member Function Documentation

virtual bool pagespeed::image_compression::PngReader::GetAttributes ( const GoogleString &  body, int *  out_width, int *  out_height, int *  out_bit_depth, int *  out_color_type  ) const

virtual

Get just the attributes of the given image. out_bit_depth is the number of bits per channel. out_color_type is one of the PNG_COLOR_TYPE_* declared in png.h.

Todo:

TODO(bmcquade): consider merging this with ImageAttributes.

Implements pagespeed::image_compression::PngReaderInterface.

virtual bool pagespeed::image_compression::PngReader::ReadPng ( const GoogleString &  body, png_structp  png_ptr, png_infop  info_ptr, int  transforms, bool  require_opaque  ) const

virtual

Parse the contents of body, convert to a PNG, and populate the PNG structures with the PNG representation. If 'require_opaque' is true, returns an image without an alpha channel if the original image has no transparent pixels, and fails otherwise. Returns true on success, false on failure.

Implements pagespeed::image_compression::PngReaderInterface.

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The documentation for this class was generated from the following file:

• pagespeed/kernel/image/png_optimizer.h