#if 0 /* in case someone actually tries to compile this */
/* example.c - an example of using libpng */
/* This is an example of how to use libpng to read and write PNG files.
* The file libpng.txt is much more verbose then this. If you have not
* read it, do so first. This was designed to be a starting point of an
* implementation. This is not officially part of libpng, is hereby placed
* in the public domain, and therefore does not require a copyright notice.
*
* This file does not currently compile, because it is missing certain
* parts, like allocating memory to hold an image. You will have to
* supply these parts to get it to compile. For an example of a minimal
* working PNG reader/writer, see pngtest.c, included in this distribution;
* see also the programs in the contrib directory.
*/
#include "png.h"
/* The png_jmpbuf() macro, used in error handling, became available in
* libpng version 1.0.6. If you want to be able to run your code with older
* versions of libpng, you must define the macro yourself (but only if it
* is not already defined by libpng!).
*/
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* Check to see if a file is a PNG file using png_sig_cmp(). png_sig_cmp()
* returns zero if the image is a PNG and nonzero if it isn't a PNG.
*
* The function check_if_png() shown here, but not used, returns nonzero (true)
* if the file can be opened and is a PNG, 0 (false) otherwise.
*
* If this call is successful, and you are going to keep the file open,
* you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
* you have created the png_ptr, so that libpng knows your application
* has read that many bytes from the start of the file. Make sure you
* don't call png_set_sig_bytes() with more than 8 bytes read or give it
* an incorrect number of bytes read, or you will either have read too
* many bytes (your fault), or you are telling libpng to read the wrong
* number of magic bytes (also your fault).
*
* Many applications already read the first 2 or 4 bytes from the start
* of the image to determine the file type, so it would be easiest just
* to pass the bytes to png_sig_cmp() or even skip that if you know
* you have a PNG file, and call png_set_sig_bytes().
*/
#define PNG_BYTES_TO_CHECK 4
int check_if_png
(char *file_name
, FILE
**fp
)
{
char buf
[PNG_BYTES_TO_CHECK
];
/* Open the prospective PNG file. */
if ((*fp
= fopen(file_name
, "rb")) == NULL
)
return 0;
/* Read in some of the signature bytes */
if (fread(buf
, 1, PNG_BYTES_TO_CHECK
, *fp
) != PNG_BYTES_TO_CHECK
)
return 0;
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
Return nonzero (true) if they match */
return(!png_sig_cmp
(buf
, (png_size_t
)0, PNG_BYTES_TO_CHECK
));
}
/* Read a PNG file. You may want to return an error code if the read
* fails (depending upon the failure). There are two "prototypes" given
* here - one where we are given the filename, and we need to open the
* file, and the other where we are given an open file (possibly with
* some or all of the magic bytes read - see comments above).
*/
#ifdef open_file /* prototype 1 */
void read_png
(char *file_name
) /* We need to open the file */
{
png_structp png_ptr
;
png_infop info_ptr
;
unsigned int sig_read
= 0;
png_uint_32 width
, height
;
int bit_depth
, color_type
, interlace_type
;
FILE
*fp
;
if ((fp
= fopen(file_name
, "rb")) == NULL
)
return (ERROR
);
#else no_open_file /* prototype 2 */
void read_png
(FILE
*fp
, unsigned int sig_read
) /* file is already open */
{
png_structp png_ptr
;
png_infop info_ptr
;
png_uint_32 width
, height
;
int bit_depth
, color_type
, interlace_type
;
#endif no_open_file /* only use one prototype! */
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
* was compiled with a compatible version of the library. REQUIRED
*/
png_ptr
= png_create_read_struct
(PNG_LIBPNG_VER_STRING
,
png_voidp user_error_ptr
, user_error_fn
, user_warning_fn
);
if (png_ptr
== NULL
)
{
fclose(fp
);
return (ERROR
);
}
/* Allocate/initialize the memory for image information. REQUIRED. */
info_ptr
= png_create_info_struct
(png_ptr
);
if (info_ptr
== NULL
)
{
fclose(fp
);
png_destroy_read_struct
(&png_ptr
, png_infopp_NULL
, png_infopp_NULL
);
return (ERROR
);
}
/* Set error handling if you are using the setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
if (setjmp(png_jmpbuf
(png_ptr
)))
{
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct
(&png_ptr
, &info_ptr
, png_infopp_NULL
);
fclose(fp
);
/* If we get here, we had a problem reading the file */
return (ERROR
);
}
/* One of the following I/O initialization methods is REQUIRED */
#ifdef streams /* PNG file I/O method 1 */
/* Set up the input control if you are using standard C streams */
png_init_io
(png_ptr
, fp
);
#else no_streams /* PNG file I/O method 2 */
/* If you are using replacement read functions, instead of calling
* png_init_io() here you would call:
*/
png_set_read_fn
(png_ptr
, (void *)user_io_ptr
, user_read_fn
);
/* where user_io_ptr is a structure you want available to the callbacks */
#endif no_streams /* Use only one I/O method! */
/* If we have already read some of the signature */
png_set_sig_bytes
(png_ptr
, sig_read
);
#ifdef hilevel
/*
* If you have enough memory to read in the entire image at once,
* and you need to specify only transforms that can be controlled
* with one of the PNG_TRANSFORM_* bits (this presently excludes
* dithering, filling, setting background, and doing gamma
* adjustment), then you can read the entire image (including
* pixels) into the info structure with this call:
*/
png_read_png
(png_ptr
, info_ptr
, png_transforms
, png_voidp_NULL
);
#else
/* OK, you're doing it the hard way, with the lower-level functions */
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). REQUIRED
*/
png_read_info
(png_ptr
, info_ptr
);
png_get_IHDR
(png_ptr
, info_ptr
, &width
, &height
, &bit_depth
, &color_type
,
&interlace_type
, int_p_NULL
, int_p_NULL
);
/* Set up the data transformations you want. Note that these are all
* optional. Only call them if you want/need them. Many of the
* transformations only work on specific types of images, and many
* are mutually exclusive.
*/
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
png_set_strip_16
(png_ptr
);
/* Strip alpha bytes from the input data without combining with the
* background (not recommended).
*/
png_set_strip_alpha
(png_ptr
);
/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
png_set_packing
(png_ptr
);
/* Change the order of packed pixels to least significant bit first
* (not useful if you are using png_set_packing). */
png_set_packswap
(png_ptr
);
/* Expand paletted colors into true RGB triplets */
if (color_type
== PNG_COLOR_TYPE_PALETTE
)
png_set_palette_rgb
(png_ptr
);
/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type
== PNG_COLOR_TYPE_GRAY
&& bit_depth
< 8)
png_set_gray_1_2_4_to_8
(png_ptr
);
/* Expand paletted or RGB images with transparency to full alpha channels
* so the data will be available as RGBA quartets.
*/
if (png_get_valid
(png_ptr
, info_ptr
, PNG_INFO_tRNS
))
png_set_tRNS_to_alpha
(png_ptr
);
/* Set the background color to draw transparent and alpha images over.
* It is possible to set the red, green, and blue components directly
* for paletted images instead of supplying a palette index. Note that
* even if the PNG file supplies a background, you are not required to
* use it - you should use the (solid) application background if it has one.
*/
png_color_16 my_background
, *image_background
;
if (png_get_bKGD
(png_ptr
, info_ptr
, &image_background
))
png_set_background
(png_ptr
, image_background
,
PNG_BACKGROUND_GAMMA_FILE
, 1, 1.0);
else
png_set_background
(png_ptr
, &my_background
,
PNG_BACKGROUND_GAMMA_SCREEN
, 0, 1.0);
/* Some suggestions as to how to get a screen gamma value */
/* Note that screen gamma is the display_exponent, which includes
* the CRT_exponent and any correction for viewing conditions */
if (/* We have a user-defined screen gamma value */)
{
screen_gamma
= user
-defined screen_gamma
;
}
/* This is one way that applications share the same screen gamma value */
else if ((gamma_str
= getenv("SCREEN_GAMMA")) != NULL
)
{
screen_gamma
= atof(gamma_str
);
}
/* If we don't have another value */
else
{
screen_gamma
= 2.2; /* A good guess for a PC monitors in a dimly
lit room */
screen_gamma
= 1.7 or
1.0; /* A good guess for Mac systems */
}
/* Tell libpng to handle the gamma conversion for you. The final call
* is a good guess for PC generated images, but it should be configurable
* by the user at run time by the user. It is strongly suggested that
* your application support gamma correction.
*/
int intent
;
if (png_get_sRGB
(png_ptr
, info_ptr
, &intent
))
png_set_gamma
(png_ptr
, screen_gamma
, 0.45455);
else
{
double image_gamma
;
if (png_get_gAMA
(png_ptr
, info_ptr
, &image_gamma
))
png_set_gamma
(png_ptr
, screen_gamma
, image_gamma
);
else
png_set_gamma
(png_ptr
, screen_gamma
, 0.45455);
}
/* Dither RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen.
*/
if (color_type
& PNG_COLOR_MASK_COLOR
)
{
int num_palette
;
png_colorp palette
;
/* This reduces the image to the application supplied palette */
if (/* we have our own palette */)
{
/* An array of colors to which the image should be dithered */
png_color std_color_cube
[MAX_SCREEN_COLORS
];
png_set_dither
(png_ptr
, std_color_cube
, MAX_SCREEN_COLORS
,
MAX_SCREEN_COLORS
, png_uint_16p_NULL
, 0);
}
/* This reduces the image to the palette supplied in the file */
else if (png_get_PLTE
(png_ptr
, info_ptr
, &palette
, &num_palette
))
{
png_uint_16p histogram
= NULL
;
png_get_hIST
(png_ptr
, info_ptr
, &histogram
);
png_set_dither
(png_ptr
, palette
, num_palette
,
max_screen_colors
, histogram
, 0);
}
}
/* invert monochrome files to have 0 as white and 1 as black */
png_set_invert_mono
(png_ptr
);
/* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the
* colors were originally in:
*/
if (png_get_valid
(png_ptr
, info_ptr
, PNG_INFO_sBIT
))
{
png_color_8p sig_bit
;
png_get_sBIT
(png_ptr
, info_ptr
, &sig_bit
);
png_set_shift
(png_ptr
, sig_bit
);
}
/* flip the RGB pixels to BGR (or RGBA to BGRA) */
if (color_type
& PNG_COLOR_MASK_COLOR
)
png_set_bgr
(png_ptr
);
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
png_set_swap_alpha
(png_ptr
);
/* swap bytes of 16 bit files to least significant byte first */
png_set_swap
(png_ptr
);
/* Add filler (or alpha) byte (before/after each RGB triplet) */
png_set_filler
(png_ptr
, 0xff, PNG_FILLER_AFTER
);
/* Turn on interlace handling. REQUIRED if you are not using
* png_read_image(). To see how to handle interlacing passes,
* see the png_read_row() method below:
*/
number_passes
= png_set_interlace_handling
(png_ptr
);
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
* update the palette for you (ie you selected such a transform above).
*/
png_read_update_info
(png_ptr
, info_ptr
);
/* Allocate the memory to hold the image using the fields of info_ptr. */
/* The easiest way to read the image: */
png_bytep row_pointers
[height
];
for (row
= 0; row
< height
; row
++)
{
row_pointers
[row
] = png_malloc
(png_ptr
, png_get_rowbytes
(png_ptr
,
info_ptr
));
}
/* Now it's time to read the image. One of these methods is REQUIRED */
#ifdef entire /* Read the entire image in one go */
png_read_image
(png_ptr
, row_pointers
);
#else no_entire /* Read the image one or more scanlines at a time */
/* The other way to read images - deal with interlacing: */
for (pass
= 0; pass
< number_passes
; pass
++)
{
#ifdef single /* Read the image a single row at a time */
for (y
= 0; y
< height
; y
++)
{
png_read_rows
(png_ptr
, &row_pointers
[y
], png_bytepp_NULL
, 1);
}
#else no_single /* Read the image several rows at a time */
for (y
= 0; y
< height
; y
+= number_of_rows
)
{
#ifdef sparkle /* Read the image using the "sparkle" effect. */
png_read_rows
(png_ptr
, &row_pointers
[y
], png_bytepp_NULL
,
number_of_rows
);
#else no_sparkle /* Read the image using the "rectangle" effect */
png_read_rows
(png_ptr
, png_bytepp_NULL
, &row_pointers
[y
],
number_of_rows
);
#endif no_sparkle /* use only one of these two methods */
}
/* if you want to display the image after every pass, do
so here */
#endif no_single /* use only one of these two methods */
}
#endif no_entire /* use only one of these two methods */
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end
(png_ptr
, info_ptr
);
#endif hilevel
/* At this point you have read the entire image */
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct
(&png_ptr
, &info_ptr
, png_infopp_NULL
);
/* close the file */
fclose(fp
);
/* that's it */
return (OK
);
}
/* progressively read a file */
int
initialize_png_reader
(png_structp
*png_ptr
, png_infop
*info_ptr
)
{
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also check that
* the library version is compatible in case we are using dynamically
* linked libraries.
*/
*png_ptr
= png_create_read_struct
(PNG_LIBPNG_VER_STRING
,
png_voidp user_error_ptr
, user_error_fn
, user_warning_fn
);
if (*png_ptr
== NULL
)
{
*info_ptr
= NULL
;
return (ERROR
);
}
*info_ptr
= png_create_info_struct
(png_ptr
);
if (*info_ptr
== NULL
)
{
png_destroy_read_struct
(png_ptr
, info_ptr
, png_infopp_NULL
);
return (ERROR
);
}
if (setjmp(png_jmpbuf
((*png_ptr
))))
{
png_destroy_read_struct
(png_ptr
, info_ptr
, png_infopp_NULL
);
return (ERROR
);
}
/* This one's new. You will need to provide all three
* function callbacks, even if you aren't using them all.
* If you aren't using all functions, you can specify NULL
* parameters. Even when all three functions are NULL,
* you need to call png_set_progressive_read_fn().
* These functions shouldn't be dependent on global or
* static variables if you are decoding several images
* simultaneously. You should store stream specific data
* in a separate struct, given as the second parameter,
* and retrieve the pointer from inside the callbacks using
* the function png_get_progressive_ptr(png_ptr).
*/
png_set_progressive_read_fn
(*png_ptr
, (void *)stream_data
,
info_callback
, row_callback
, end_callback
);
return (OK
);
}
int
process_data
(png_structp
*png_ptr
, png_infop
*info_ptr
,
png_bytep buffer
, png_uint_32 length
)
{
if (setjmp(png_jmpbuf
((*png_ptr
))))
{
/* Free the png_ptr and info_ptr memory on error */
png_destroy_read_struct
(png_ptr
, info_ptr
, png_infopp_NULL
);
return (ERROR
);
}
/* This one's new also. Simply give it chunks of data as
* they arrive from the data stream (in order, of course).
* On Segmented machines, don't give it any more than 64K.
* The library seems to run fine with sizes of 4K, although
* you can give it much less if necessary (I assume you can
* give it chunks of 1 byte, but I haven't tried with less
* than 256 bytes yet). When this function returns, you may
* want to display any rows that were generated in the row
* callback, if you aren't already displaying them there.
*/
png_process_data
(*png_ptr
, *info_ptr
, buffer
, length
);
return (OK
);
}
info_callback
(png_structp png_ptr
, png_infop info
)
{
/* do any setup here, including setting any of the transformations
* mentioned in the Reading PNG files section. For now, you _must_
* call either png_start_read_image() or png_read_update_info()
* after all the transformations are set (even if you don't set
* any). You may start getting rows before png_process_data()
* returns, so this is your last chance to prepare for that.
*/
}
row_callback
(png_structp png_ptr
, png_bytep new_row
,
png_uint_32 row_num
, int pass
)
{
/*
* This function is called for every row in the image. If the
* image is interlaced, and you turned on the interlace handler,
* this function will be called for every row in every pass.
*
* In this function you will receive a pointer to new row data from
* libpng called new_row that is to replace a corresponding row (of
* the same data format) in a buffer allocated by your application.
*
* The new row data pointer new_row may be NULL, indicating there is
* no new data to be replaced (in cases of interlace loading).
*
* If new_row is not NULL then you need to call
* png_progressive_combine_row() to replace the corresponding row as
* shown below:
*/
/* Check if row_num is in bounds. */
if((row_num
>= 0) && (row_num
< height
))
{
/* Get pointer to corresponding row in our
* PNG read buffer.
*/
png_bytep old_row
= ((png_bytep
*)our_data
)[row_num
];
/* If both rows are allocated then copy the new row
* data to the corresponding row data.
*/
if((old_row
!= NULL
) && (new_row
!= NULL
))
png_progressive_combine_row
(png_ptr
, old_row
, new_row
);
}
/*
* The rows and passes are called in order, so you don't really
* need the row_num and pass, but I'm supplying them because it
* may make your life easier.
*
* For the non-NULL rows of interlaced images, you must call
* png_progressive_combine_row() passing in the new row and the
* old row, as demonstrated above. You can call this function for
* NULL rows (it will just return) and for non-interlaced images
* (it just does the png_memcpy for you) if it will make the code
* easier. Thus, you can just do this for all cases:
*/
png_progressive_combine_row
(png_ptr
, old_row
, new_row
);
/* where old_row is what was displayed for previous rows. Note
* that the first pass (pass == 0 really) will completely cover
* the old row, so the rows do not have to be initialized. After
* the first pass (and only for interlaced images), you will have
* to pass the current row as new_row, and the function will combine
* the old row and the new row.
*/
}
end_callback
(png_structp png_ptr
, png_infop info
)
{
/* this function is called when the whole image has been read,
* including any chunks after the image (up to and including
* the IEND). You will usually have the same info chunk as you
* had in the header, although some data may have been added
* to the comments and time fields.
*
* Most people won't do much here, perhaps setting a flag that
* marks the image as finished.
*/
}
/* write a png file */
void write_png
(char *file_name
/* , ... other image information ... */)
{
FILE
*fp
;
png_structp png_ptr
;
png_infop info_ptr
;
png_colorp palette
;
/* open the file */
fp
= fopen(file_name
, "wb");
if (fp
== NULL
)
return (ERROR
);
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also check that
* the library version is compatible with the one used at compile time,
* in case we are using dynamically linked libraries. REQUIRED.
*/
png_ptr
= png_create_write_struct
(PNG_LIBPNG_VER_STRING
,
png_voidp user_error_ptr
, user_error_fn
, user_warning_fn
);
if (png_ptr
== NULL
)
{
fclose(fp
);
return (ERROR
);
}
/* Allocate/initialize the image information data. REQUIRED */
info_ptr
= png_create_info_struct
(png_ptr
);
if (info_ptr
== NULL
)
{
fclose(fp
);
png_destroy_write_struct
(&png_ptr
, png_infopp_NULL
);
return (ERROR
);
}
/* Set error handling. REQUIRED if you aren't supplying your own
* error handling functions in the png_create_write_struct() call.
*/
if (setjmp(png_jmpbuf
(png_ptr
)))
{
/* If we get here, we had a problem reading the file */
fclose(fp
);
png_destroy_write_struct
(&png_ptr
, &info_ptr
);
return (ERROR
);
}
/* One of the following I/O initialization functions is REQUIRED */
#ifdef streams /* I/O initialization method 1 */
/* set up the output control if you are using standard C streams */
png_init_io
(png_ptr
, fp
);
#else no_streams /* I/O initialization method 2 */
/* If you are using replacement read functions, instead of calling
* png_init_io() here you would call */
png_set_write_fn
(png_ptr
, (void *)user_io_ptr
, user_write_fn
,
user_IO_flush_function
);
/* where user_io_ptr is a structure you want available to the callbacks */
#endif no_streams /* only use one initialization method */
#ifdef hilevel
/* This is the easy way. Use it if you already have all the
* image info living info in the structure. You could "|" many
* PNG_TRANSFORM flags into the png_transforms integer here.
*/
png_write_png
(png_ptr
, info_ptr
, png_transforms
, png_voidp_NULL
);
#else
/* This is the hard way */
/* Set the image information here. Width and height are up to 2^31,
* bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
* the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
* PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
* or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
* PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
* currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
*/
png_set_IHDR
(png_ptr
, info_ptr
, width
, height
, bit_depth
, PNG_COLOR_TYPE_
???,
PNG_INTERLACE_
????, PNG_COMPRESSION_TYPE_BASE
, PNG_FILTER_TYPE_BASE
);
/* set the palette if there is one. REQUIRED for indexed-color images */
palette
= (png_colorp
)png_malloc
(png_ptr
, PNG_MAX_PALETTE_LENGTH
* sizeof (png_color
));
/* ... set palette colors ... */
png_set_PLTE
(png_ptr
, info_ptr
, palette
, PNG_MAX_PALETTE_LENGTH
);
/* You must not free palette here, because png_set_PLTE only makes a link to
the palette that you malloced. Wait until you are about to destroy
the png structure. */
/* optional significant bit chunk */
/* if we are dealing with a grayscale image then */
sig_bit.
gray = true_bit_depth
;
/* otherwise, if we are dealing with a color image then */
sig_bit.
red = true_red_bit_depth
;
sig_bit.
green = true_green_bit_depth
;
sig_bit.
blue = true_blue_bit_depth
;
/* if the image has an alpha channel then */
sig_bit.
alpha = true_alpha_bit_depth
;
png_set_sBIT
(png_ptr
, info_ptr
, sig_bit
);
/* Optional gamma chunk is strongly suggested if you have any guess
* as to the correct gamma of the image.
*/
png_set_gAMA
(png_ptr
, info_ptr
, gamma
);
/* Optionally write comments into the image */
text_ptr
[0].
key = "Title";
text_ptr
[0].
text = "Mona Lisa";
text_ptr
[0].
compression = PNG_TEXT_COMPRESSION_NONE
;
text_ptr
[1].
key = "Author";
text_ptr
[1].
text = "Leonardo DaVinci";
text_ptr
[1].
compression = PNG_TEXT_COMPRESSION_NONE
;
text_ptr
[2].
key = "Description";
text_ptr
[2].
text = "<long text>";
text_ptr
[2].
compression = PNG_TEXT_COMPRESSION_zTXt
;
#ifdef PNG_iTXt_SUPPORTED
text_ptr
[0].
lang = NULL
;
text_ptr
[1].
lang = NULL
;
text_ptr
[2].
lang = NULL
;
#endif
png_set_text
(png_ptr
, info_ptr
, text_ptr
, 3);
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
/* note that if sRGB is present the gAMA and cHRM chunks must be ignored
* on read and must be written in accordance with the sRGB profile */
/* Write the file header information. REQUIRED */
png_write_info
(png_ptr
, info_ptr
);
/* If you want, you can write the info in two steps, in case you need to
* write your private chunk ahead of PLTE:
*
* png_write_info_before_PLTE(write_ptr, write_info_ptr);
* write_my_chunk();
* png_write_info(png_ptr, info_ptr);
*
* However, given the level of known- and unknown-chunk support in 1.1.0
* and up, this should no longer be necessary.
*/
/* Once we write out the header, the compression type on the text
* chunks gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
* PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
* at the end.
*/
/* set up the transformations you want. Note that these are
* all optional. Only call them if you want them.
*/
/* invert monochrome pixels */
png_set_invert_mono
(png_ptr
);
/* Shift the pixels up to a legal bit depth and fill in
* as appropriate to correctly scale the image.
*/
png_set_shift
(png_ptr
, &sig_bit
);
/* pack pixels into bytes */
png_set_packing
(png_ptr
);
/* swap location of alpha bytes from ARGB to RGBA */
png_set_swap_alpha
(png_ptr
);
/* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
* RGB (4 channels -> 3 channels). The second parameter is not used.
*/
png_set_filler
(png_ptr
, 0, PNG_FILLER_BEFORE
);
/* flip BGR pixels to RGB */
png_set_bgr
(png_ptr
);
/* swap bytes of 16-bit files to most significant byte first */
png_set_swap
(png_ptr
);
/* swap bits of 1, 2, 4 bit packed pixel formats */
png_set_packswap
(png_ptr
);
/* turn on interlace handling if you are not using png_write_image() */
if (interlacing
)
number_passes
= png_set_interlace_handling
(png_ptr
);
else
number_passes
= 1;
/* The easiest way to write the image (you may have a different memory
* layout, however, so choose what fits your needs best). You need to
* use the first method if you aren't handling interlacing yourself.
*/
png_uint_32 k
, height
, width
;
png_byte image
[height
][width
*bytes_per_pixel
];
png_bytep row_pointers
[height
];
for (k
= 0; k
< height
; k
++)
row_pointers
[k
] = image
+ k
*width
*bytes_per_pixel
;
/* One of the following output methods is REQUIRED */
#ifdef entire /* write out the entire image data in one call */
png_write_image
(png_ptr
, row_pointers
);
/* the other way to write the image - deal with interlacing */
#else no_entire /* write out the image data by one or more scanlines */
/* The number of passes is either 1 for non-interlaced images,
* or 7 for interlaced images.
*/
for (pass
= 0; pass
< number_passes
; pass
++)
{
/* Write a few rows at a time. */
png_write_rows
(png_ptr
, &row_pointers
[first_row
], number_of_rows
);
/* If you are only writing one row at a time, this works */
for (y
= 0; y
< height
; y
++)
{
png_write_rows
(png_ptr
, &row_pointers
[y
], 1);
}
}
#endif no_entire /* use only one output method */
/* You can write optional chunks like tEXt, zTXt, and tIME at the end
* as well. Shouldn't be necessary in 1.1.0 and up as all the public
* chunks are supported and you can use png_set_unknown_chunks() to
* register unknown chunks into the info structure to be written out.
*/
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end
(png_ptr
, info_ptr
);
#endif hilevel
/* If you png_malloced a palette, free it here (don't free info_ptr->palette,
as recommended in versions 1.0.5m and earlier of this example; if
libpng mallocs info_ptr->palette, libpng will free it). If you
allocated it with malloc() instead of png_malloc(), use free() instead
of png_free(). */
png_free
(png_ptr
, palette
);
palette
=NULL
;
/* Similarly, if you png_malloced any data that you passed in with
png_set_something(), such as a hist or trans array, free it here,
when you can be sure that libpng is through with it. */
png_free
(png_ptr
, trans
);
trans
=NULL
;
/* clean up after the write, and free any memory allocated */
png_destroy_write_struct
(&png_ptr
, &info_ptr
);
/* close the file */
fclose(fp
);
/* that's it */
return (OK
);
}
#endif /* if 0 */