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update libpng

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update libpng, the repo now requires a vcpkg setup for integrating but skipping the install step should allow it to work for windows an linux, mac might need more
This commit is contained in:
marauder2k7 2025-12-31 20:11:14 +00:00
parent c593d860a0
commit 5d644b4ffb
300 changed files with 25573 additions and 17698 deletions
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50
Engine/lib/lpng/example.c
View file

@ -1,9 +1,8 @@
#if 0 /* in case someone actually tries to compile this */
/* example.c - an example of using libpng
*
* Maintained 2018 Cosmin Truta
* Maintained 2018-2025 Cosmin Truta
* Maintained 1998-2016 Glenn Randers-Pehrson
* Maintained 1996-1997 Andreas Dilger
* Written 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -125,6 +124,7 @@ int main(int argc, const char **argv)
png_image_free(&image);
else
free(buffer);
}
}
/* Something went wrong reading or writing the image. libpng stores a
@ -179,11 +179,11 @@ int main(int argc, const char **argv)
* components.
*
* You do not have to read directly from a file. You can read from memory or,
* on systems that support it, from a <stdio.h> FILE*. This is controlled by
* the particular png_image_read_from_ function you call at the start.
* Likewise, on write, you can write to a FILE* if your system supports it.
* Check the macro PNG_STDIO_SUPPORTED to see if stdio support has been
* included in your libpng build.
* on systems that support <stdio.h>, from a FILE object. This is controlled
* by the particular png_image_begin_read_from_ function you call at the start.
* Likewise, on write, you can write to a FILE object if your system supports
* <stdio.h>. The macro PNG_STDIO_SUPPORTED indicates if stdio is available
* and accessible from your libpng build.
*
* If you read 16-bit (PNG_FORMAT_FLAG_LINEAR) data, you may need to write it
* in the 8-bit format for display. You do this by setting the convert_to_8bit
@ -258,9 +258,9 @@ int check_if_png(char *file_name, FILE **fp)
return 0;
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
* Return nonzero (true) if they match.
* Return true if they match.
*/
return(!png_sig_cmp(buf, 0, PNG_BYTES_TO_CHECK));
return png_sig_cmp(buf, 0, PNG_BYTES_TO_CHECK) == 0;
}
/* Read a PNG file. You may want to return an error code if the read
@ -280,7 +280,7 @@ void read_png(char *file_name) /* We need to open the file */
FILE *fp;
if ((fp = fopen(file_name, "rb")) == NULL)
return (ERROR);
return ERROR;
#else no_open_file /* prototype 2 */
void read_png(FILE *fp, int sig_read) /* File is already open */
@ -303,7 +303,7 @@ void read_png(FILE *fp, int sig_read) /* File is already open */
if (png_ptr == NULL)
{
fclose(fp);
return (ERROR);
return ERROR;
}
/* Allocate/initialize the memory for image information. REQUIRED. */
@ -312,7 +312,7 @@ void read_png(FILE *fp, int sig_read) /* File is already open */
{
fclose(fp);
png_destroy_read_struct(&png_ptr, NULL, NULL);
return (ERROR);
return ERROR;
}
/* Set error handling if you are using the setjmp/longjmp method (this is
@ -325,7 +325,7 @@ void read_png(FILE *fp, int sig_read) /* File is already open */
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(fp);
/* If we get here, we had a problem reading the file. */
return (ERROR);
return ERROR;
}
/* One of the following I/O initialization methods is REQUIRED. */
@ -584,7 +584,7 @@ void read_png(FILE *fp, int sig_read) /* File is already open */
fclose(fp);
/* That's it! */
return (OK);
return OK;
}
/* Progressively read a file */
@ -603,18 +603,18 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
if (*png_ptr == NULL)
{
*info_ptr = NULL;
return (ERROR);
return ERROR;
}
*info_ptr = png_create_info_struct(png_ptr);
if (*info_ptr == NULL)
{
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
return ERROR;
}
if (setjmp(png_jmpbuf((*png_ptr))))
{
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
return ERROR;
}
/* You will need to provide all three function callbacks,
@ -631,7 +631,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
*/
png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
info_callback, row_callback, end_callback);
return (OK);
return OK;
}
int
@ -642,7 +642,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
{
/* Free the png_ptr and info_ptr memory on error. */
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
return ERROR;
}
/* Give chunks of data as they arrive from the data stream
@ -656,7 +656,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
* callback, if you aren't already displaying them there.
*/
png_process_data(*png_ptr, *info_ptr, buffer, length);
return (OK);
return OK;
}
info_callback(png_structp png_ptr, png_infop info)
@ -746,7 +746,7 @@ void write_png(char *file_name /* , ... other image information ... */)
/* Open the file */
fp = fopen(file_name, "wb");
if (fp == NULL)
return (ERROR);
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,
@ -759,7 +759,7 @@ void write_png(char *file_name /* , ... other image information ... */)
if (png_ptr == NULL)
{
fclose(fp);
return (ERROR);
return ERROR;
}
/* Allocate/initialize the image information data. REQUIRED. */
@ -768,7 +768,7 @@ void write_png(char *file_name /* , ... other image information ... */)
{
fclose(fp);
png_destroy_write_struct(&png_ptr, NULL);
return (ERROR);
return ERROR;
}
/* Set up error handling. REQUIRED if you aren't supplying your own
@ -779,7 +779,7 @@ void write_png(char *file_name /* , ... other image information ... */)
/* If we get here, we had a problem writing the file. */
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
return (ERROR);
return ERROR;
}
/* One of the following I/O initialization functions is REQUIRED. */
@ -1034,7 +1034,7 @@ void write_png(char *file_name /* , ... other image information ... */)
fclose(fp);
/* That's it! */
return (OK);
return OK;
}
#endif /* if 0 */