#include <png.h>
Inheritance diagram for image_format_png:
Public Member Functions | |
| virtual | ~image_format_png () |
Static Public Member Functions | |
| static pointer | create (const std::string &filename) |
| static pointer | create_blank (int width, int height) |
Protected Member Functions | |
| const char * | type_name () const |
| void | save_to_file (const std::string &filename) const |
Private Member Functions | |
| bool | calc_needs_alpha () const |
| bool | calc_needs_rgb () const |
| image_format_png () | |
| image_format_png (int width, int height, data_t *data) | |
| image_format_png (int width, int height) | |
| image_format_png (const image_format_png &) | |
| image_format_png & | operator= (const image_format_png &) |
Detailed Description
The image_format_png class is used to represent an image in PNG format.
Constructor & Destructor Documentation
| image_format_png::~image_format_png | ( | ) | [virtual] |
| image_format_png::image_format_png | ( | ) | [private] |
The default constructor. Do not use.
| image_format_png::image_format_png | ( | int | width, |
| int | height, | ||
| data_t * | data | ||
| ) | [private] |
| image_format_png::image_format_png | ( | int | width, |
| int | height | ||
| ) | [private] |
| image_format_png::image_format_png | ( | const image_format_png & | ) | [private] |
The copy constructor. Do not use.
Member Function Documentation
| bool image_format_png::calc_needs_alpha | ( | void | ) | const [private] |
The calc_needs_alpha method is used by the save_to_file method to determine whether or not the alpha channel needs to be stored into the output file (i.e. if any pixel has an alpha != 255).
- Returns:
- true of the image needs an explict alpha channel, false if an explict (all alpha == 255) channel is sufficient.
| bool image_format_png::calc_needs_rgb | ( | void | ) | const [private] |
The calc_needs_rgb method is used by the save_to_file method to determine whether or not the data is grayscale (r == b == b for all pixels). Completely transparent pixels are ignored.
- Returns:
- true if at least one pixel (r != g || r != b), false if all the pixels can be represented with a grayscale file.
| image::pointer image_format_png::create | ( | const std::string & | filename | ) | [static] |
| image::pointer image_format_png::create_blank | ( | int | width, |
| int | height | ||
| ) | [static] |
| image_format_png& image_format_png::operator= | ( | const image_format_png & | ) | [private] |
The assignment operator. Do not use.
| void image_format_png::save_to_file | ( | const std::string & | filename | ) | const [protected, virtual] |
The save_to_file method is used to store the image data into a file on disk.
- Parameters:
-
filename The name of the file to be written.
Reimplemented from image_format.
| const char * image_format_png::type_name | ( | ) | const [protected, virtual] |
The documentation for this class was generated from the following files:
