image_png.c File Reference

#include "darkplaces.h"
#include "image.h"
#include "image_png.h"

Include dependency graph for image_png.c:

Go to the source code of this file.

Macros
#define	PNG_ALL_FILTERS
#define	PNG_COLOR_MASK_ALPHA   4
#define	PNG_COLOR_MASK_COLOR   2
#define	PNG_COLOR_MASK_PALETTE   1
#define	PNG_COLOR_TYPE_GA   PNG_COLOR_TYPE_GRAY_ALPHA
#define	PNG_COLOR_TYPE_GRAY   0
#define	PNG_COLOR_TYPE_GRAY_ALPHA   (PNG_COLOR_MASK_ALPHA)
#define	PNG_COLOR_TYPE_PALETTE   (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
#define	PNG_COLOR_TYPE_RGB   (PNG_COLOR_MASK_COLOR)
#define	PNG_COLOR_TYPE_RGB_ALPHA   (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
#define	PNG_COLOR_TYPE_RGBA   PNG_COLOR_TYPE_RGB_ALPHA
#define	PNG_COMPRESSION_TYPE_BASE   0
#define	PNG_COMPRESSION_TYPE_DEFAULT   PNG_COMPRESSION_TYPE_BASE
#define	PNG_FILTER_AVG   0x40
#define	PNG_FILTER_NONE   0x08
#define	PNG_FILTER_PAETH   0x80
#define	PNG_FILTER_SUB   0x10
#define	PNG_FILTER_TYPE_BASE   0
#define	PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
#define	PNG_FILTER_UP   0x20
#define	PNG_INFO_tRNS   0x0010
#define	PNG_INTERLACE_ADAM7   1
#define	PNG_INTERLACE_NONE   0
#define	PNG_LIBPNG_VER_STRING_12   "1.2.4"
#define	PNG_LIBPNG_VER_STRING_14   "1.4.0"
#define	PNG_LIBPNG_VER_STRING_15   "1.5.0"
#define	PNG_LIBPNG_VER_STRING_16   "1.6.0"
#define	PNG_NO_FILTERS   0x00
#define	qpng_jmpbuf(png_ptr)
#define	qpng_jmpbuf_12(png_ptr)
#define	qpng_jmpbuf_14(png_ptr)
#define	Z_BEST_COMPRESSION   9
#define	Z_BEST_SPEED   1

Typedefs
typedef void(*	qpng_longjmp_ptr) (jmp_buf, int)

Functions
void	PNG_CloseLibrary (void)
static void	PNG_error_fn (void *png, const char *message)
static void	PNG_fFlushData (void *png)
static void	PNG_fReadData (void *png, unsigned char *data, size_t length)
static void	PNG_fWriteData (void *png, unsigned char *data, size_t length)
unsigned char *	PNG_LoadImage_BGRA (const unsigned char *raw, int filesize, int *miplevel)
qbool	PNG_OpenLibrary (void)
qbool	PNG_SaveImage_preflipped (const char *filename, int width, int height, qbool has_alpha, unsigned char *data)
static void	PNG_warning_fn (void *png, const char *message)

Variables
struct {
int   BitDepth
int   BytesPerPixel
int   ColorType
int   Compression
unsigned char *   Data
int   Filter
unsigned int   FRowBytes
unsigned char **   FRowPtrs
unsigned long   Height
int   Interlace
qfile_t *   outfile
const unsigned char *   tmpBuf
int   tmpBuflength
int   tmpi
unsigned long   Width
}	my_png
dllhandle_t	png14_dll = NULL
static dllfunction_t	png14funcs []
dllhandle_t	png_dll = NULL
static dllfunction_t	pngfuncs []
static unsigned int(*	qpng_access_version_number )(void)
static void *(*	qpng_create_info_struct )(void *)
static void *(*	qpng_create_read_struct )(const char *, void *, void(*)(void *png, const char *message), void(*)(void *png, const char *message))
static void *(*	qpng_create_write_struct )(const char *, void *, void(*)(void *png, const char *message), void(*)(void *png, const char *message))
static void(*	qpng_destroy_read_struct )(void **, void **, void **)
static void(*	qpng_destroy_write_struct )(void **, void **)
static unsigned char(*	qpng_get_bit_depth )(void *, void *)
static unsigned char(*	qpng_get_channels )(void *, void *)
static unsigned int(*	qpng_get_IHDR )(void *, void *, unsigned long *, unsigned long *, int *, int *, int *, int *, int *)
static unsigned int(*	qpng_get_rowbytes )(void *, void *)
static unsigned int(*	qpng_get_valid )(void *, void *, unsigned int)
static void(*	qpng_read_end )(void *, void *)
static void(*	qpng_read_image )(void *, unsigned char **)
static void(*	qpng_read_info )(void *, void *)
static void(*	qpng_read_update_info )(void *, void *)
static void(*	qpng_set_bgr )(void *)
static void(*	qpng_set_compression_level )(void *, int)
static void(*	qpng_set_expand )(void *)
static void(*	qpng_set_filler )(void *, unsigned int, int)
static void(*	qpng_set_filter )(void *, int, int)
static void(*	qpng_set_gray_to_rgb )(void *)
static void(*	qpng_set_IHDR )(void *, void *, unsigned long, unsigned long, int, int, int, int, int)
static int(*	qpng_set_interlace_handling )(void *)
static jmp_buf *(*	qpng_set_longjmp_fn )(void *, qpng_longjmp_ptr, size_t)
static void(*	qpng_set_packing )(void *)
static void(*	qpng_set_palette_to_rgb )(void *)
static void(*	qpng_set_read_fn )(void *, void *, void(*)(void *png, unsigned char *data, size_t length))
static void(*	qpng_set_sig_bytes )(void *, int)
static void(*	qpng_set_tRNS_to_alpha )(void *)
static void(*	qpng_set_write_fn )(void *, void *, void(*)(void *png, unsigned char *data, size_t length), void(*)(void *png))
static int(*	qpng_sig_cmp )(const unsigned char *, size_t, size_t)
static void(*	qpng_write_end )(void *, void *)
static void(*	qpng_write_info )(void *, void *)
static void(*	qpng_write_row )(void *, unsigned char *)

Macro Definition Documentation

PNG_ALL_FILTERS

#define PNG_ALL_FILTERS

Value:

                         (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
                         PNG_FILTER_AVG | PNG_FILTER_PAETH)

Definition at line 467 of file image_png.c.

#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
                         PNG_FILTER_AVG | PNG_FILTER_PAETH)

PNG_COLOR_MASK_ALPHA

#define PNG_COLOR_MASK_ALPHA   4

Definition at line 215 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

PNG_COLOR_MASK_COLOR

#define PNG_COLOR_MASK_COLOR   2

Definition at line 214 of file image_png.c.

PNG_COLOR_MASK_PALETTE

#define PNG_COLOR_MASK_PALETTE   1

Definition at line 213 of file image_png.c.

PNG_COLOR_TYPE_GA

#define PNG_COLOR_TYPE_GA   PNG_COLOR_TYPE_GRAY_ALPHA

Definition at line 224 of file image_png.c.

PNG_COLOR_TYPE_GRAY

#define PNG_COLOR_TYPE_GRAY   0

Definition at line 217 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

PNG_COLOR_TYPE_GRAY_ALPHA

#define PNG_COLOR_TYPE_GRAY_ALPHA   (PNG_COLOR_MASK_ALPHA)

Definition at line 221 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

PNG_COLOR_TYPE_PALETTE

#define PNG_COLOR_TYPE_PALETTE   (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)

Definition at line 218 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

PNG_COLOR_TYPE_RGB

#define PNG_COLOR_TYPE_RGB   (PNG_COLOR_MASK_COLOR)

Definition at line 219 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_COLOR_TYPE_RGB_ALPHA

#define PNG_COLOR_TYPE_RGB_ALPHA   (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)

Definition at line 220 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

PNG_COLOR_TYPE_RGBA

#define PNG_COLOR_TYPE_RGBA   PNG_COLOR_TYPE_RGB_ALPHA

Definition at line 223 of file image_png.c.

PNG_COMPRESSION_TYPE_BASE

#define PNG_COMPRESSION_TYPE_BASE   0

Definition at line 459 of file image_png.c.

PNG_COMPRESSION_TYPE_DEFAULT

#define PNG_COMPRESSION_TYPE_DEFAULT   PNG_COMPRESSION_TYPE_BASE

Definition at line 460 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

PNG_FILTER_AVG

#define PNG_FILTER_AVG   0x40

Definition at line 465 of file image_png.c.

PNG_FILTER_NONE

#define PNG_FILTER_NONE   0x08

Definition at line 462 of file image_png.c.

PNG_FILTER_PAETH

#define PNG_FILTER_PAETH   0x80

Definition at line 466 of file image_png.c.

PNG_FILTER_SUB

#define PNG_FILTER_SUB   0x10

Definition at line 463 of file image_png.c.

PNG_FILTER_TYPE_BASE

#define PNG_FILTER_TYPE_BASE   0

Definition at line 457 of file image_png.c.

PNG_FILTER_TYPE_DEFAULT

#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE

Definition at line 458 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

PNG_FILTER_UP

#define PNG_FILTER_UP   0x20

Definition at line 464 of file image_png.c.

PNG_INFO_tRNS

#define PNG_INFO_tRNS   0x0010

Definition at line 226 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

PNG_INTERLACE_ADAM7

#define PNG_INTERLACE_ADAM7   1

Definition at line 456 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

PNG_INTERLACE_NONE

#define PNG_INTERLACE_NONE   0

Definition at line 455 of file image_png.c.

PNG_LIBPNG_VER_STRING_12

#define PNG_LIBPNG_VER_STRING_12   "1.2.4"

Definition at line 208 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_LIBPNG_VER_STRING_14

#define PNG_LIBPNG_VER_STRING_14   "1.4.0"

Definition at line 209 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_LIBPNG_VER_STRING_15

#define PNG_LIBPNG_VER_STRING_15   "1.5.0"

Definition at line 210 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_LIBPNG_VER_STRING_16

#define PNG_LIBPNG_VER_STRING_16   "1.6.0"

Definition at line 211 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_NO_FILTERS

#define PNG_NO_FILTERS   0x00

Definition at line 461 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_jmpbuf

#define qpng_jmpbuf

(

png_ptr

)

Value:

    (qpng_set_longjmp_fn ? qpng_jmpbuf_14(png_ptr) : qpng_jmpbuf_12(png_ptr))

Definition at line 77 of file image_png.c.

#define qpng_jmpbuf(png_ptr) \
    (qpng_set_longjmp_fn ? qpng_jmpbuf_14(png_ptr) : qpng_jmpbuf_12(png_ptr))

Referenced by PNG_LoadImage_BGRA().

qpng_jmpbuf_12

#define qpng_jmpbuf_12

(

png_ptr

)

Value:

(*((jmp_buf *) png_ptr))

Definition at line 74 of file image_png.c.

qpng_jmpbuf_14

#define qpng_jmpbuf_14

(

png_ptr

)

Value:

(*qpng_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))

Definition at line 71 of file image_png.c.

Z_BEST_COMPRESSION

#define Z_BEST_COMPRESSION   9

Definition at line 454 of file image_png.c.

Z_BEST_SPEED

#define Z_BEST_SPEED   1

Definition at line 453 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

Typedef Documentation

qpng_longjmp_ptr

typedef void(* qpng_longjmp_ptr) (jmp_buf, int)

Definition at line 69 of file image_png.c.

Function Documentation

PNG_CloseLibrary()

void PNG_CloseLibrary

(

void

)

Definition at line 194 of file image_png.c.

{
    Sys_FreeLibrary (&png14_dll);
    Sys_FreeLibrary (&png_dll);
}

References png14_dll, png_dll, and Sys_FreeLibrary().

PNG_error_fn()

static void PNG_error_fn ( void * png, const char * message )

static

Definition at line 284 of file image_png.c.

{
    Con_Printf(CON_ERROR "PNG_LoadImage: error: %s\n", message);
}

References CON_ERROR, Con_Printf(), and message.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

PNG_fFlushData()

static void PNG_fFlushData ( void * png )

static

Definition at line 280 of file image_png.c.

{
}

Referenced by PNG_SaveImage_preflipped().

PNG_fReadData()

static void PNG_fReadData ( void * png, unsigned char * data, size_t length )

static

Definition at line 258 of file image_png.c.

{
    size_t l;
    l = my_png.tmpBuflength - my_png.tmpi;
    if (l < length)
    {
        Con_Printf("PNG_fReadData: overrun by %i bytes\n", (int)(length - l));
        // a read going past the end of the file, fill in the remaining bytes
        // with 0 just to be consistent
        memset(data + l, 0, length - l);
        length = l;
    }
    memcpy(data, my_png.tmpBuf + my_png.tmpi, length);
    my_png.tmpi += (int)length;
    //Com_HexDumpToConsole(data, (int)length);
}

References Con_Printf(), data, int(), length, and my_png.

Referenced by PNG_LoadImage_BGRA().

PNG_fWriteData()

static void PNG_fWriteData ( void * png, unsigned char * data, size_t length )

static

Definition at line 275 of file image_png.c.

{
    FS_Write(my_png.outfile, data, length);
}

References data, FS_Write(), length, and my_png.

Referenced by PNG_SaveImage_preflipped().

PNG_LoadImage_BGRA()

unsigned char * PNG_LoadImage_BGRA	(	const unsigned char *	raw,
		int	filesize,
		int *	miplevel )

Definition at line 294 of file image_png.c.

{
    unsigned int c;
    unsigned int    y;
    void *png, *pnginfo;
    unsigned char *imagedata = NULL;
    unsigned char ioBuffer[8192];
 
    // FIXME: register an error handler so that abort() won't be called on error
 
    // No DLL = no PNGs
    if (!png_dll)
        return NULL;
 
    if(qpng_sig_cmp(raw, 0, filesize))
        return NULL;
    png = (void *)qpng_create_read_struct(
        (qpng_access_version_number() / 100 == 102) ? PNG_LIBPNG_VER_STRING_12 :
        (qpng_access_version_number() / 100 == 104) ? PNG_LIBPNG_VER_STRING_14 :
        (qpng_access_version_number() / 100 == 105) ? PNG_LIBPNG_VER_STRING_15 :
        PNG_LIBPNG_VER_STRING_16, // nasty hack... whatever
        0, PNG_error_fn, PNG_warning_fn
    );
    if(!png)
        return NULL;
 
    // this must be memset before the setjmp error handler, because it relies
    // on the fields in this struct for cleanup
    memset(&my_png, 0, sizeof(my_png));
 
    // NOTE: this relies on jmp_buf being the first thing in the png structure
    // created by libpng! (this is correct for libpng 1.2.x)
    if (setjmp(qpng_jmpbuf(png)))
    {
        if (my_png.Data)
            Mem_Free(my_png.Data);
        my_png.Data = NULL;
        if (my_png.FRowPtrs)
            Mem_Free(my_png.FRowPtrs);
        my_png.FRowPtrs = NULL;
        qpng_destroy_read_struct(&png, &pnginfo, 0);
        return NULL;
    }
    //
 
    pnginfo = qpng_create_info_struct(png);
    if(!pnginfo)
    {
        qpng_destroy_read_struct(&png, &pnginfo, 0);
        return NULL;
    }
    qpng_set_sig_bytes(png, 0);
 
    my_png.tmpBuf = raw;
    my_png.tmpBuflength = filesize;
    my_png.tmpi = 0;
    //my_png.Data       = NULL;
    //my_png.FRowPtrs   = NULL;
    //my_png.Height     = 0;
    //my_png.Width      = 0;
    my_png.ColorType    = PNG_COLOR_TYPE_RGB;
    //my_png.Interlace  = 0;
    //my_png.Compression    = 0;
    //my_png.Filter     = 0;
    qpng_set_read_fn(png, ioBuffer, PNG_fReadData);
    qpng_read_info(png, pnginfo);
    qpng_get_IHDR(png, pnginfo, &my_png.Width, &my_png.Height,&my_png.BitDepth, &my_png.ColorType, &my_png.Interlace, &my_png.Compression, &my_png.Filter);
 
    // this check guards against pngconf.h with unsigned int *width/height parameters on big endian systems by detecting the strange values and shifting them down 32bits
    // (if it's little endian the unwritten bytes are the most significant
    //  ones and we don't worry about that)
    //
    // this is only necessary because of retarded 64bit png_uint_32 types in libpng 1.2, which can (conceivably) vary by platform
#if LONG_MAX > 4000000000
    if (my_png.Width > LONG_MAX || my_png.Height > LONG_MAX)
    {
        my_png.Width >>= 32;
        my_png.Height >>= 32;
    }
#endif
 
    if (my_png.ColorType == PNG_COLOR_TYPE_PALETTE)
        qpng_set_palette_to_rgb(png);
    if (my_png.ColorType == PNG_COLOR_TYPE_GRAY || my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
        qpng_set_gray_to_rgb(png);
    if (qpng_get_valid(png, pnginfo, PNG_INFO_tRNS))
        qpng_set_tRNS_to_alpha(png);
    if (my_png.BitDepth == 8 && !(my_png.ColorType  & PNG_COLOR_MASK_ALPHA))
        qpng_set_filler(png, 255, 1);
    if (( my_png.ColorType == PNG_COLOR_TYPE_GRAY) || (my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA ))
        qpng_set_gray_to_rgb(png);
    if (my_png.BitDepth < 8)
        qpng_set_expand(png);
 
    qpng_read_update_info(png, pnginfo);
 
    my_png.FRowBytes = qpng_get_rowbytes(png, pnginfo);
    my_png.BytesPerPixel = qpng_get_channels(png, pnginfo);
 
    my_png.FRowPtrs = (unsigned char **)Mem_Alloc(tempmempool, my_png.Height * sizeof(*my_png.FRowPtrs));
    if (my_png.FRowPtrs)
    {
        imagedata = (unsigned char *)Mem_Alloc(tempmempool, my_png.Height * my_png.FRowBytes);
        if(imagedata)
        {
            my_png.Data = imagedata;
            for(y = 0;y < my_png.Height;y++)
                my_png.FRowPtrs[y] = my_png.Data + y * my_png.FRowBytes;
            qpng_read_image(png, my_png.FRowPtrs);
        }
        else
        {
            Con_Printf("PNG_LoadImage : not enough memory\n");
            qpng_destroy_read_struct(&png, &pnginfo, 0);
            Mem_Free(my_png.FRowPtrs);
            return NULL;
        }
        Mem_Free(my_png.FRowPtrs);
        my_png.FRowPtrs = NULL;
    }
    else
    {
        Con_Printf("PNG_LoadImage : not enough memory\n");
        qpng_destroy_read_struct(&png, &pnginfo, 0);
        return NULL;
    }
 
    qpng_read_end(png, pnginfo);
    qpng_destroy_read_struct(&png, &pnginfo, 0);
 
    image_width = (int)my_png.Width;
    image_height = (int)my_png.Height;
 
    if (my_png.BitDepth != 8)
    {
        Con_Printf ("PNG_LoadImage : bad color depth\n");
        Mem_Free(imagedata);
        return NULL;
    }
 
    // swizzle RGBA to BGRA
    for (y = 0;y < (unsigned int)(image_width*image_height*4);y += 4)
    {
        c = imagedata[y+0];
        imagedata[y+0] = imagedata[y+2];
        imagedata[y+2] = c;
    }
 
    return imagedata;
}

References Con_Printf(), image_height, image_width, int(), Mem_Alloc, Mem_Free, my_png, NULL, PNG_COLOR_MASK_ALPHA, PNG_COLOR_TYPE_GRAY, PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB, png_dll, PNG_error_fn(), PNG_fReadData(), PNG_INFO_tRNS, PNG_LIBPNG_VER_STRING_12, PNG_LIBPNG_VER_STRING_14, PNG_LIBPNG_VER_STRING_15, PNG_LIBPNG_VER_STRING_16, PNG_warning_fn(), qpng_access_version_number, qpng_create_info_struct, qpng_create_read_struct, qpng_destroy_read_struct, qpng_get_channels, qpng_get_IHDR, qpng_get_rowbytes, qpng_get_valid, qpng_jmpbuf, qpng_read_end, qpng_read_image, qpng_read_info, qpng_read_update_info, qpng_set_expand, qpng_set_filler, qpng_set_gray_to_rgb, qpng_set_palette_to_rgb, qpng_set_read_fn, qpng_set_sig_bytes, qpng_set_tRNS_to_alpha, qpng_sig_cmp, tempmempool, and y.

Referenced by decode_image().

PNG_OpenLibrary()

qbool PNG_OpenLibrary

(

void

)

Definition at line 143 of file image_png.c.

{
    const char* dllnames [] =
    {
#if WIN32
        "libpng16.dll",
        "libpng16-16.dll",
        "libpng15-15.dll",
        "libpng15.dll",
        "libpng14-14.dll",
        "libpng14.dll",
        "libpng12.dll",
#elif defined(MACOSX)
        "libpng16.16.dylib",
        "libpng15.15.dylib",
        "libpng14.14.dylib",
        "libpng12.0.dylib",
#else
        "libpng16.so.16",
        "libpng15.so.15", // WTF libtool guidelines anyone?
        "libpng14.so.14", // WTF libtool guidelines anyone?
        "libpng12.so.0",
        "libpng.so", // FreeBSD
#endif
        NULL
    };
 
    // Already loaded?
    if (png_dll)
        return true;
 
    // Load the DLL
    if(!Sys_LoadDependency (dllnames, &png_dll, pngfuncs))
        return false;
    if(qpng_access_version_number() / 100 >= 104)
        if(!Sys_LoadDependency (dllnames, &png14_dll, png14funcs))
        {
            Sys_FreeLibrary (&png_dll);
            return false;
        }
    return true;
}

References NULL, png14_dll, png14funcs, png_dll, pngfuncs, qpng_access_version_number, Sys_FreeLibrary(), and Sys_LoadDependency().

Referenced by Image_Compress(), and r_textures_start().

PNG_SaveImage_preflipped()

qbool PNG_SaveImage_preflipped	(	const char *	filename,
		int	width,
		int	height,
		qbool	has_alpha,
		unsigned char *	data )

Definition at line 477 of file image_png.c.

{
    unsigned int offset, linesize;
    qfile_t* file = NULL;
    void *png, *pnginfo;
    unsigned char ioBuffer[8192];
    int passes, i, j;
 
    // No DLL = no JPEGs
    if (!png_dll)
    {
        Con_Print("You need the libpng library to save PNG images\n");
        return false;
    }
 
    png = (void *)qpng_create_write_struct( 
        (qpng_access_version_number() / 100 == 102) ? PNG_LIBPNG_VER_STRING_12 :
        (qpng_access_version_number() / 100 == 104) ? PNG_LIBPNG_VER_STRING_14 :
        (qpng_access_version_number() / 100 == 105) ? PNG_LIBPNG_VER_STRING_15 :
        PNG_LIBPNG_VER_STRING_16, // nasty hack... whatever
        0, PNG_error_fn, PNG_warning_fn
    );
    if(!png)
        return false;
    pnginfo = (void *)qpng_create_info_struct(png);
    if(!pnginfo)
    {
         qpng_destroy_write_struct(&png, NULL);
         return false;
    }
 
    // this must be memset before the setjmp error handler, because it relies
    // on the fields in this struct for cleanup
    memset(&my_png, 0, sizeof(my_png));
 
    // NOTE: this relies on jmp_buf being the first thing in the png structure
    // created by libpng! (this is correct for libpng 1.2.x)
#ifdef WIN64
    if (setjmp((_JBTYPE *)png))
#elif defined(MACOSX) || defined(WIN32)
    if (setjmp((int *)png))
#elif defined(__ANDROID__)
    if (setjmp((long *)png))
#else
    if (setjmp((struct __jmp_buf_tag *)png))
#endif
    {
        qpng_destroy_write_struct(&png, &pnginfo);
        return false;
    }
 
    // Open the file
    file = FS_OpenRealFile(filename, "wb", true);
    if (!file)
        return false;
    my_png.outfile = file;
    qpng_set_write_fn(png, ioBuffer, PNG_fWriteData, PNG_fFlushData);
 
    //qpng_set_compression_level(png, Z_BEST_COMPRESSION);
    qpng_set_compression_level(png, Z_BEST_SPEED);
    qpng_set_IHDR(png, pnginfo, width, height, 8, has_alpha ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB, PNG_INTERLACE_ADAM7, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
    qpng_set_filter(png, 0, PNG_NO_FILTERS);
    qpng_write_info(png, pnginfo);
    qpng_set_packing(png);
    qpng_set_bgr(png);
 
    passes = qpng_set_interlace_handling(png);
 
    linesize = width * (has_alpha ? 4 : 3);
    offset = linesize * (height - 1);
    for(i = 0; i < passes; ++i)
        for(j = 0; j < height; ++j)
            qpng_write_row(png, &data[offset - j * linesize]);
 
    qpng_write_end(png, NULL);
    qpng_destroy_write_struct(&png, &pnginfo);
 
    FS_Close (file);
 
    return true;
}

References Con_Print(), data, FS_Close(), FS_OpenRealFile(), height, i, my_png, NULL, offset, PNG_COLOR_TYPE_RGB, PNG_COLOR_TYPE_RGB_ALPHA, PNG_COMPRESSION_TYPE_DEFAULT, png_dll, PNG_error_fn(), PNG_fFlushData(), PNG_FILTER_TYPE_DEFAULT, PNG_fWriteData(), PNG_INTERLACE_ADAM7, PNG_LIBPNG_VER_STRING_12, PNG_LIBPNG_VER_STRING_14, PNG_LIBPNG_VER_STRING_15, PNG_LIBPNG_VER_STRING_16, PNG_NO_FILTERS, PNG_warning_fn(), qpng_access_version_number, qpng_create_info_struct, qpng_create_write_struct, qpng_destroy_write_struct, qpng_set_bgr, qpng_set_compression_level, qpng_set_filter, qpng_set_IHDR, qpng_set_interlace_handling, qpng_set_packing, qpng_set_write_fn, qpng_write_end, qpng_write_info, qpng_write_row, width, and Z_BEST_SPEED.

Referenced by SCR_ScreenShot().

PNG_warning_fn()

static void PNG_warning_fn ( void * png, const char * message )

static

Definition at line 289 of file image_png.c.

{
    Con_Printf(CON_WARN "PNG_LoadImage: warning: %s\n", message);
}

References Con_Printf(), CON_WARN, and message.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

Variable Documentation

BitDepth

int BitDepth

Definition at line 244 of file image_png.c.

BytesPerPixel

int BytesPerPixel

Definition at line 245 of file image_png.c.

ColorType

int ColorType

Definition at line 246 of file image_png.c.

Compression

int Compression

Definition at line 250 of file image_png.c.

Data

unsigned char* Data

Definition at line 240 of file image_png.c.

Filter

int Filter

Definition at line 251 of file image_png.c.

FRowBytes

unsigned int FRowBytes

Definition at line 236 of file image_png.c.

FRowPtrs

unsigned char** FRowPtrs

Definition at line 239 of file image_png.c.

Height

unsigned long Height

Definition at line 247 of file image_png.c.

Interlace

int Interlace

Definition at line 249 of file image_png.c.

[struct]

struct { ... } my_png

Referenced by PNG_fReadData(), PNG_fWriteData(), PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

outfile

qfile_t* outfile

Definition at line 254 of file image_png.c.

Referenced by CL_Locs_Save_f(), JPEG_FileDest(), and main().

png14_dll

dllhandle_t png14_dll = NULL

Definition at line 125 of file image_png.c.

Referenced by PNG_CloseLibrary(), and PNG_OpenLibrary().

png14funcs

dllfunction_t png14funcs[]

static

Initial value:

=
{
    {"png_set_longjmp_fn",      (void **) &qpng_set_longjmp_fn},
    {NULL, NULL}
}

Definition at line 117 of file image_png.c.

{
    {"png_set_longjmp_fn",      (void **) &qpng_set_longjmp_fn},
    {NULL, NULL}
};

Referenced by PNG_OpenLibrary().

png_dll

dllhandle_t png_dll = NULL

Definition at line 124 of file image_png.c.

Referenced by PNG_CloseLibrary(), PNG_LoadImage_BGRA(), PNG_OpenLibrary(), and PNG_SaveImage_preflipped().

pngfuncs

dllfunction_t pngfuncs[]

static

Definition at line 80 of file image_png.c.

{
    {"png_set_sig_bytes",       (void **) &qpng_set_sig_bytes},
    {"png_sig_cmp",             (void **) &qpng_sig_cmp},
    {"png_create_read_struct",  (void **) &qpng_create_read_struct},
    {"png_create_write_struct", (void **) &qpng_create_write_struct},
    {"png_create_info_struct",  (void **) &qpng_create_info_struct},
    {"png_read_info",           (void **) &qpng_read_info},
    {"png_set_compression_level",   (void **) &qpng_set_compression_level},
    {"png_set_filter",          (void **) &qpng_set_filter},
    {"png_set_expand",          (void **) &qpng_set_expand},
    {"png_set_palette_to_rgb",  (void **) &qpng_set_palette_to_rgb},
    {"png_set_tRNS_to_alpha",   (void **) &qpng_set_tRNS_to_alpha},
    {"png_set_gray_to_rgb",     (void **) &qpng_set_gray_to_rgb},
    {"png_set_filler",          (void **) &qpng_set_filler},
    {"png_set_IHDR",            (void **) &qpng_set_IHDR},
    {"png_set_packing",         (void **) &qpng_set_packing},
    {"png_set_bgr",             (void **) &qpng_set_bgr},
    {"png_set_interlace_handling",  (void **) &qpng_set_interlace_handling},
    {"png_read_update_info",    (void **) &qpng_read_update_info},
    {"png_read_image",          (void **) &qpng_read_image},
    {"png_read_end",            (void **) &qpng_read_end},
    {"png_destroy_read_struct", (void **) &qpng_destroy_read_struct},
    {"png_destroy_write_struct",    (void **) &qpng_destroy_write_struct},
    {"png_set_read_fn",         (void **) &qpng_set_read_fn},
    {"png_set_write_fn",        (void **) &qpng_set_write_fn},
    {"png_get_valid",           (void **) &qpng_get_valid},
    {"png_get_rowbytes",        (void **) &qpng_get_rowbytes},
    {"png_get_channels",        (void **) &qpng_get_channels},
    {"png_get_bit_depth",       (void **) &qpng_get_bit_depth},
    {"png_get_IHDR",            (void **) &qpng_get_IHDR},
    {"png_access_version_number",       (void **) &qpng_access_version_number},
    {"png_write_info",          (void **) &qpng_write_info},
    {"png_write_row",           (void **) &qpng_write_row},
    {"png_write_end",           (void **) &qpng_write_end},
    {NULL, NULL}
};

Referenced by PNG_OpenLibrary().

qpng_access_version_number

unsigned int(* qpng_access_version_number) (void) ( void )

static

Definition at line 63 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), PNG_OpenLibrary(), and PNG_SaveImage_preflipped().

qpng_create_info_struct

void *(* qpng_create_info_struct) (void *) ( void * )

static

Definition at line 38 of file image_png.c.

Referenced by PNG_LoadImage_BGRA(), and PNG_SaveImage_preflipped().

qpng_create_read_struct

void *(* qpng_create_read_struct) (const char *, void *, void(*)(void *png, const char *message), void(*)(void *png, const char *message)) ( const char * , void * , void(*  )(void *png, const char *message), void(*  )(void *png, const char *message) )

static

Definition at line 36 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_create_write_struct

void *(* qpng_create_write_struct) (const char *, void *, void(*)(void *png, const char *message), void(*)(void *png, const char *message)) ( const char * , void * , void(*  )(void *png, const char *message), void(*  )(void *png, const char *message) )

static

Definition at line 37 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_destroy_read_struct

void(* qpng_destroy_read_struct) (void **, void **, void **) ( void ** , void ** , void **  )

static

Definition at line 54 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_destroy_write_struct

void(* qpng_destroy_write_struct) (void **, void **) ( void ** , void **  )

static

Definition at line 55 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_get_bit_depth

unsigned char(* qpng_get_bit_depth) (void *, void *) ( void * , void *  )

static

Definition at line 61 of file image_png.c.

qpng_get_channels

unsigned char(* qpng_get_channels) (void *, void *) ( void * , void *  )

static

Definition at line 60 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_get_IHDR

unsigned int(* qpng_get_IHDR) (void *, void *, unsigned long *, unsigned long *, int *, int *, int *, int *, int *) ( void * , void * , unsigned long * , unsigned long * , int * , int * , int * , int * , int *  )

static

Definition at line 62 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_get_rowbytes

unsigned int(* qpng_get_rowbytes) (void *, void *) ( void * , void *  )

static

Definition at line 59 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_get_valid

unsigned int(* qpng_get_valid) (void *, void *, unsigned int) ( void * , void * , unsigned int  )

static

Definition at line 58 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_read_end

void(* qpng_read_end) (void *, void *) ( void * , void *  )

static

Definition at line 53 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_read_image

void(* qpng_read_image) (void *, unsigned char **) ( void * , unsigned char **  )

static

Definition at line 52 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_read_info

void(* qpng_read_info) (void *, void *) ( void * , void *  )

static

Definition at line 39 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_read_update_info

void(* qpng_read_update_info) (void *, void *) ( void * , void *  )

static

Definition at line 51 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_bgr

void(* qpng_set_bgr) (void *) ( void * )

static

Definition at line 49 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_compression_level

void(* qpng_set_compression_level) (void *, int) ( void * , int  )

static

Definition at line 40 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_expand

void(* qpng_set_expand) (void *) ( void * )

static

Definition at line 42 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_filler

void(* qpng_set_filler) (void *, unsigned int, int) ( void * , unsigned int , int  )

static

Definition at line 46 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_filter

void(* qpng_set_filter) (void *, int, int) ( void * , int , int  )

static

Definition at line 41 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_gray_to_rgb

void(* qpng_set_gray_to_rgb) (void *) ( void * )

static

Definition at line 45 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_IHDR

void(* qpng_set_IHDR) (void *, void *, unsigned long, unsigned long, int, int, int, int, int) ( void * , void * , unsigned long , unsigned long , int , int , int , int , int  )

static

Definition at line 47 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_interlace_handling

int(* qpng_set_interlace_handling) (void *) ( void * )

static

Definition at line 50 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_longjmp_fn

jmp_buf *(* qpng_set_longjmp_fn) (void *, qpng_longjmp_ptr, size_t) ( void * , qpng_longjmp_ptr , size_t  )

static

Definition at line 70 of file image_png.c.

qpng_set_packing

void(* qpng_set_packing) (void *) ( void * )

static

Definition at line 48 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_set_palette_to_rgb

void(* qpng_set_palette_to_rgb) (void *) ( void * )

static

Definition at line 43 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_read_fn

void(* qpng_set_read_fn) (void *, void *, void(*)(void *png, unsigned char *data, size_t length)) ( void * , void * , void(*  )(void *png, unsigned char *data, size_t length) )

static

Definition at line 56 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_sig_bytes

void(* qpng_set_sig_bytes) (void *, int) ( void * , int  )

static

Definition at line 34 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_tRNS_to_alpha

void(* qpng_set_tRNS_to_alpha) (void *) ( void * )

static

Definition at line 44 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_set_write_fn

void(* qpng_set_write_fn) (void *, void *, void(*)(void *png, unsigned char *data, size_t length), void(*)(void *png)) ( void * , void * , void(*  )(void *png, unsigned char *data, size_t length), void(*  )(void *png) )

static

Definition at line 57 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_sig_cmp

int(* qpng_sig_cmp) (const unsigned char *, size_t, size_t) ( const unsigned char * , size_t , size_t  )

static

Definition at line 35 of file image_png.c.

Referenced by PNG_LoadImage_BGRA().

qpng_write_end

void(* qpng_write_end) (void *, void *) ( void * , void *  )

static

Definition at line 66 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_write_info

void(* qpng_write_info) (void *, void *) ( void * , void *  )

static

Definition at line 64 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

qpng_write_row

void(* qpng_write_row) (void *, unsigned char *) ( void * , unsigned char *  )

static

Definition at line 65 of file image_png.c.

Referenced by PNG_SaveImage_preflipped().

tmpBuf

const unsigned char* tmpBuf

Definition at line 231 of file image_png.c.

tmpBuflength

int tmpBuflength

Definition at line 232 of file image_png.c.

tmpi

int tmpi

Definition at line 233 of file image_png.c.

Width

unsigned long Width

Definition at line 248 of file image_png.c.