Move the current copy of libpng out of the way for a pending update.

git-svn-id: http://svn.ghostscript.com/ghostscript/trunk@8299 a1074d23-0009-0410-80fe-cf8c14f379e6

1 files changed, 0 insertions, 280 deletions

diff --git a/gs/libpng/contrib/gregbook/readpng.c b/gs/libpng/contrib/gregbook/readpng.c
deleted file mode 100644
index b8e0904e2..000000000
--- a/gs/libpng/contrib/gregbook/readpng.c
+++ /dev/null
@@ -1,280 +0,0 @@
-/*---------------------------------------------------------------------------
-
-   rpng - simple PNG display program                              readpng.c
-
-  ---------------------------------------------------------------------------
-
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
-
-      This software is provided "as is," without warranty of any kind,
-      express or implied.  In no event shall the author or contributors
-      be held liable for any damages arising in any way from the use of
-      this software.
-
-      Permission is granted to anyone to use this software for any purpose,
-      including commercial applications, and to alter it and redistribute
-      it freely, subject to the following restrictions:
-
-      1. Redistributions of source code must retain the above copyright
-         notice, disclaimer, and this list of conditions.
-      2. Redistributions in binary form must reproduce the above copyright
-         notice, disclaimer, and this list of conditions in the documenta-
-         tion and/or other materials provided with the distribution.
-      3. All advertising materials mentioning features or use of this
-         software must display the following acknowledgment:
-
-            This product includes software developed by Greg Roelofs
-            and contributors for the book, "PNG: The Definitive Guide,"
-            published by O'Reilly and Associates.
-
-  ---------------------------------------------------------------------------*/
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "png.h"        /* libpng header; includes zlib.h */
-#include "readpng.h"    /* typedefs, common macros, public prototypes */
-
-/* future versions of libpng will provide this macro: */
-#ifndef png_jmpbuf
-#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
-#endif
-
-
-static png_structp png_ptr = NULL;
-static png_infop info_ptr = NULL;
-
-png_uint_32  width, height;
-int  bit_depth, color_type;
-uch  *image_data = NULL;
-
-
-void readpng_version_info(void)
-{
-    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
-      PNG_LIBPNG_VER_STRING, png_libpng_ver);
-    fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
-      ZLIB_VERSION, zlib_version);
-}
-
-
-/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
-
-int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
-{
-    uch sig[8];
-
-
-    /* first do a quick check that the file really is a PNG image; could
-     * have used slightly more general png_sig_cmp() function instead */
-
-    fread(sig, 1, 8, infile);
-    if (!png_check_sig(sig, 8))
-        return 1;   /* bad signature */
-
-
-    /* could pass pointers to user-defined error handlers instead of NULLs: */
-
-    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-    if (!png_ptr)
-        return 4;   /* out of memory */
-
-    info_ptr = png_create_info_struct(png_ptr);
-    if (!info_ptr) {
-        png_destroy_read_struct(&png_ptr, NULL, NULL);
-        return 4;   /* out of memory */
-    }
-
-
-    /* we could create a second info struct here (end_info), but it's only
-     * useful if we want to keep pre- and post-IDAT chunk info separated
-     * (mainly for PNG-aware image editors and converters) */
-
-
-    /* setjmp() must be called in every function that calls a PNG-reading
-     * libpng function */
-
-    if (setjmp(png_jmpbuf(png_ptr))) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        return 2;
-    }
-
-
-    png_init_io(png_ptr, infile);
-    png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */
-
-    png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */
-
-
-    /* alternatively, could make separate calls to png_get_image_width(),
-     * etc., but want bit_depth and color_type for later [don't care about
-     * compression_type and filter_type => NULLs] */
-
-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
-      NULL, NULL, NULL);
-    *pWidth = width;
-    *pHeight = height;
-
-
-    /* OK, that's all we need for now; return happy */
-
-    return 0;
-}
-
-
-
-
-/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
- * scales values to 8-bit if necessary */
-
-int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
-{
-    png_color_16p pBackground;
-
-
-    /* setjmp() must be called in every function that calls a PNG-reading
-     * libpng function */
-
-    if (setjmp(png_jmpbuf(png_ptr))) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        return 2;
-    }
-
-
-    if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
-        return 1;
-
-    /* it is not obvious from the libpng documentation, but this function
-     * takes a pointer to a pointer, and it always returns valid red, green
-     * and blue values, regardless of color_type: */
-
-    png_get_bKGD(png_ptr, info_ptr, &pBackground);
-
-
-    /* however, it always returns the raw bKGD data, regardless of any
-     * bit-depth transformations, so check depth and adjust if necessary */
-
-    if (bit_depth == 16) {
-        *red   = pBackground->red   >> 8;
-        *green = pBackground->green >> 8;
-        *blue  = pBackground->blue  >> 8;
-    } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
-        if (bit_depth == 1)
-            *red = *green = *blue = pBackground->gray? 255 : 0;
-        else if (bit_depth == 2)
-            *red = *green = *blue = (255/3) * pBackground->gray;
-        else /* bit_depth == 4 */
-            *red = *green = *blue = (255/15) * pBackground->gray;
-    } else {
-        *red   = (uch)pBackground->red;
-        *green = (uch)pBackground->green;
-        *blue  = (uch)pBackground->blue;
-    }
-
-    return 0;
-}
-
-
-
-
-/* display_exponent == LUT_exponent * CRT_exponent */
-
-uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
-{
-    double  gamma;
-    png_uint_32  i, rowbytes;
-    png_bytepp  row_pointers = NULL;
-
-
-    /* setjmp() must be called in every function that calls a PNG-reading
-     * libpng function */
-
-    if (setjmp(png_jmpbuf(png_ptr))) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        return NULL;
-    }
-
-
-    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
-     * transparency chunks to full alpha channel; strip 16-bit-per-sample
-     * images to 8 bits per sample; and convert grayscale to RGB[A] */
-
-    if (color_type == PNG_COLOR_TYPE_PALETTE)
-        png_set_expand(png_ptr);
-    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
-        png_set_expand(png_ptr);
-    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
-        png_set_expand(png_ptr);
-    if (bit_depth == 16)
-        png_set_strip_16(png_ptr);
-    if (color_type == PNG_COLOR_TYPE_GRAY ||
-        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-        png_set_gray_to_rgb(png_ptr);
-
-
-    /* unlike the example in the libpng documentation, we have *no* idea where
-     * this file may have come from--so if it doesn't have a file gamma, don't
-     * do any correction ("do no harm") */
-
-    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
-        png_set_gamma(png_ptr, display_exponent, gamma);
-
-
-    /* all transformations have been registered; now update info_ptr data,
-     * get rowbytes and channels, and allocate image memory */
-
-    png_read_update_info(png_ptr, info_ptr);
-
-    *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
-    *pChannels = (int)png_get_channels(png_ptr, info_ptr);
-
-    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        return NULL;
-    }
-    if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        free(image_data);
-        image_data = NULL;
-        return NULL;
-    }
-
-    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
-
-
-    /* set the individual row_pointers to point at the correct offsets */
-
-    for (i = 0;  i < height;  ++i)
-        row_pointers[i] = image_data + i*rowbytes;
-
-
-    /* now we can go ahead and just read the whole image */
-
-    png_read_image(png_ptr, row_pointers);
-
-
-    /* and we're done!  (png_read_end() can be omitted if no processing of
-     * post-IDAT text/time/etc. is desired) */
-
-    free(row_pointers);
-    row_pointers = NULL;
-
-    png_read_end(png_ptr, NULL);
-
-    return image_data;
-}
-
-
-void readpng_cleanup(int free_image_data)
-{
-    if (free_image_data && image_data) {
-        free(image_data);
-        image_data = NULL;
-    }
-
-    if (png_ptr && info_ptr) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-        png_ptr = NULL;
-        info_ptr = NULL;
-    }
-}