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libpng/contrib/libtests/makepng.c
Glenn Randers-Pehrson 9d1ddbb78f [libpng16] Fixed several typos and expanded TAB characters.
2012-11-13 19:45:53 -06:00

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/* makepng.c
*
* Copyright (c) 2012 John Cunningham Bowler
*
* Last changed in libpng 1.6.0 [(PENDING RELEASE)]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Make a test PNG image. The arguments are as follows:
*
* makepng [--sRGB|--linear|--1.8] [--color=<color>] color-type bit-depth \
* [file-name]
*
* The color-type may be numeric (and must match the numbers used by the PNG
* specification) or one of the format names listed below. The bit-depth is the
* component bit depth, or the pixel bit-depth for a color-mapped image.
*
* Without any options no color-space information is written, with the options
* an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the
* display system used on older Apple computers to correct for high ambient
* light levels in the viewing environment; it applies a transform of
* approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909
* is written (1.45/2.2).
*
* The image data is generated internally. Unless --color is given the images
* used are as follows:
*
* 1 channel: a square image with a diamond, the least luminous colors are on
* the edge of the image, the most luminous in the center.
*
* 2 channels: the color channel increases in luminosity from top to bottom, the
* alpha channel increases in opacity from left to right.
*
* 3 channels: linear combinations of, from the top-left corner clockwise,
* black, green, white, red.
*
* 4 channels: linear combinations of, from the top-left corner clockwise,
* transparent, red, green, blue.
*
* For color-mapped images a four channel color-map is used and the PNG file has
* a tRNS chunk, as follows:
*
* 1-bit: entry 0 is transparent-red, entry 1 is opaque-white
* 2-bit: entry 0: transparent-green
* entry 1: 40%-red
* entry 2: 80%-blue
* entry 3: opaque-white
* 4-bit: the 16 combinations of the 2-bit case
* 8-bit: the 256 combinations of the 4-bit case
*
* The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The
* image is the 1-channel diamond, but using palette index, not luminosity.
*
* Image size is determined by the final pixel depth in bits, i.e. channels x
* bit-depth, as follows:
*
* 8 bits or less: 64x64
* 16 bits: 256x256
* More than 16 bits: 1024x1024
*
* Row filtering is turned off (the 'none' filter is used on every row) and the
* images are not interlaced.
*
* If --color is given then the whole image has that color, color-mapped images
* will have exactly one palette entry and all image files with be 16x16 in
* size. The color value is 1 to 4 decimal numbers as appropriate for the color
* type.
*
* If file-name is given then the PNG is written to that file, else it is
* written to stdout. Notice that stdout is not supported on systems where, by
* default, it assumes text output; this program makes no attempt to change the
* text mode of stdout!
*/
#define _ISOC99_SOURCE /* for strtoull */
#include <stddef.h> /* for offsetof */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <errno.h>
#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H)
# include <config.h>
#endif
/* Define the following to use this test against your installed libpng, rather
* than the one being built here:
*/
#ifdef PNG_FREESTANDING_TESTS
# include <png.h>
#else
# include "../../png.h"
#endif
/* This structure is used for inserting extra chunks (the --insert argument, not
* documented above.)
*/
typedef struct chunk_insert
{
struct chunk_insert *next;
void (*insert)(png_structp, png_infop, int, png_charpp);
int nparams;
png_charp parameters[1];
} chunk_insert;
static int
channels_of_type(int color_type)
{
if (color_type & PNG_COLOR_MASK_PALETTE)
return 1;
else
{
int channels = 1;
if (color_type & PNG_COLOR_MASK_COLOR)
channels = 3;
if (color_type & PNG_COLOR_MASK_ALPHA)
return channels + 1;
else
return channels;
}
}
static int
pixel_depth_of_type(int color_type, int bit_depth)
{
return channels_of_type(color_type) * bit_depth;
}
static unsigned int
image_size_of_type(int color_type, int bit_depth, unsigned int *colors)
{
if (*colors)
return 16;
else
{
int pixel_depth = pixel_depth_of_type(color_type, bit_depth);
if (pixel_depth < 8)
return 64;
else if (pixel_depth > 16)
return 1024;
else
return 256;
}
}
static void
set_color(png_colorp color, png_bytep trans, unsigned int red,
unsigned int green, unsigned int blue, unsigned int alpha,
png_const_bytep gamma_table)
{
color->red = gamma_table[red];
color->green = gamma_table[green];
color->blue = gamma_table[blue];
*trans = (png_byte)alpha;
}
static int
generate_palette(png_colorp palette, png_bytep trans, int bit_depth,
png_const_bytep gamma_table, unsigned int *colors)
{
/*
* 1-bit: entry 0 is transparent-red, entry 1 is opaque-white
* 2-bit: entry 0: transparent-green
* entry 1: 40%-red
* entry 2: 80%-blue
* entry 3: opaque-white
* 4-bit: the 16 combinations of the 2-bit case
* 8-bit: the 256 combinations of the 4-bit case
*/
switch (colors[0])
{
default:
fprintf(stderr, "makepng: --colors=...: invalid count %u\n",
colors[0]);
exit(1);
case 1:
set_color(palette+0, trans+0, colors[1], colors[1], colors[1], 255,
gamma_table);
return 1;
case 2:
set_color(palette+0, trans+0, colors[1], colors[1], colors[1],
colors[2], gamma_table);
return 1;
case 3:
set_color(palette+0, trans+0, colors[1], colors[2], colors[3], 255,
gamma_table);
return 1;
case 4:
set_color(palette+0, trans+0, colors[1], colors[2], colors[3],
colors[4], gamma_table);
return 1;
case 0:
if (bit_depth == 1)
{
set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table);
set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table);
return 2;
}
else
{
unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */
unsigned int x, y, ip;
for (x=0; x<size; ++x) for (y=0; y<size; ++y)
{
ip = x + (size * y);
/* size is at most 16, so the scaled value below fits in 16 bits
*/
# define interp(pos, c1, c2) ((pos * c1) + ((size-pos) * c2))
# define xyinterp(x, y, c1, c2, c3, c4) (((size * size / 2) +\
(interp(x, c1, c2) * y + (size-y) * interp(x, c3, c4))) /\
(size*size))
set_color(palette+ip, trans+ip,
/* color: green, red,blue,white */
xyinterp(x, y, 0, 255, 0, 255),
xyinterp(x, y, 255, 0, 0, 255),
xyinterp(x, y, 0, 0, 255, 255),
/* alpha: 0, 102, 204, 255) */
xyinterp(x, y, 0, 102, 204, 255),
gamma_table);
}
return ip+1;
}
}
}
static void
set_value(png_bytep row, size_t rowbytes, png_uint_32 x, unsigned int bit_depth,
png_uint_32 value, png_const_bytep gamma_table, double conv)
{
unsigned int mask = (1U << bit_depth)-1;
x *= bit_depth; /* Maximum x is 4*1024, maximum bit_depth is 16 */
if (value <= mask)
{
png_uint_32 offset = x >> 3;
if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes))
{
row += offset;
switch (bit_depth)
{
case 1:
case 2:
case 4:
/* Don't gamma correct - values get smashed */
{
unsigned int shift = (8 - bit_depth) - (x & 0x7U);
mask <<= shift;
value = (value << shift) & mask;
*row = (png_byte)((*row & ~mask) | value);
}
return;
default:
fprintf(stderr, "makepng: bad bit depth (internal error)\n");
exit(1);
case 16:
value = (unsigned int)floor(65535*pow(value/65535.,conv)+.5);
*row++ = (png_byte)(value >> 8);
*row = (png_byte)value;
return;
case 8:
*row = gamma_table[value];
return;
}
}
else
{
fprintf(stderr, "makepng: row buffer overflow (internal error)\n");
exit(1);
}
}
else
{
fprintf(stderr, "makepng: component overflow (internal error)\n");
exit(1);
}
}
static void
generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type,
int bit_depth, png_const_bytep gamma_table, double conv,
unsigned int *colors)
{
png_uint_32 size_max = image_size_of_type(color_type, bit_depth, colors)-1;
png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */
if (colors[0] == 0) switch (channels_of_type(color_type))
{
/* 1 channel: a square image with a diamond, the least luminous colors are on
* the edge of the image, the most luminous in the center.
*/
case 1:
{
png_uint_32 x;
png_uint_32 base = 2*size_max - abs(2*y-size_max);
for (x=0; x<=size_max; ++x)
{
png_uint_32 luma = base - abs(2*x-size_max);
/* 'luma' is now in the range 0..2*size_max, we need
* 0..depth_max
*/
luma = (luma*depth_max + size_max) / (2*size_max);
set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv);
}
}
break;
/* 2 channels: the color channel increases in luminosity from top to bottom,
* the alpha channel increases in opacity from left to right.
*/
case 2:
{
png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max);
png_uint_32 x;
for (x=0; x<=size_max; ++x)
{
set_value(row, rowbytes, 2*x, bit_depth,
(depth_max * x * 2 + size_max) / (2 * size_max), gamma_table,
conv);
set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table,
conv);
}
}
break;
/* 3 channels: linear combinations of, from the top-left corner clockwise,
* black, green, white, red.
*/
case 3:
{
/* x0: the black->red scale (the value of the red component) at the
* start of the row (blue and green are 0).
* x1: the green->white scale (the value of the red and blue
* components at the end of the row; green is depth_max).
*/
png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max);
png_uint_32 x;
/* Interpolate x/depth_max from start to end:
*
* start end difference
* red: Y Y 0
* green: 0 depth_max depth_max
* blue: 0 Y Y
*/
for (x=0; x<=size_max; ++x)
{
set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y,
gamma_table, conv);
set_value(row, rowbytes, 3*x+1, bit_depth, /* green */
(depth_max * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */
(Y * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
}
}
break;
/* 4 channels: linear combinations of, from the top-left corner clockwise,
* transparent, red, green, blue.
*/
case 4:
{
/* x0: the transparent->blue scale (the value of the blue and alpha
* components) at the start of the row (red and green are 0).
* x1: the red->green scale (the value of the red and green
* components at the end of the row; blue is 0 and alpha is
* depth_max).
*/
png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max);
png_uint_32 x;
/* Interpolate x/depth_max from start to end:
*
* start end difference
* red: 0 depth_max-Y depth_max-Y
* green: 0 Y Y
* blue: Y 0 -Y
* alpha: Y depth_max depth_max-Y
*/
for (x=0; x<=size_max; ++x)
{
set_value(row, rowbytes, 4*x+0, bit_depth, /* red */
((depth_max-Y) * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
set_value(row, rowbytes, 4*x+1, bit_depth, /* green */
(Y * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */
Y - (Y * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */
Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max),
gamma_table, conv);
}
}
break;
default:
fprintf(stderr, "makepng: internal bad channel count\n");
exit(2);
}
else if (color_type & PNG_COLOR_MASK_PALETTE)
{
/* Palette with fixed color: the image rows are all 0 and the image width
* is 16.
*/
memset(row, rowbytes, 0);
}
else if (colors[0] == channels_of_type(color_type))
switch (channels_of_type(color_type))
{
case 1:
{
const png_uint_32 luma = colors[1];
png_uint_32 x;
for (x=0; x<=size_max; ++x)
set_value(row, rowbytes, x, bit_depth, luma, gamma_table,
conv);
}
break;
case 2:
{
const png_uint_32 luma = colors[1];
const png_uint_32 alpha = colors[2];
png_uint_32 x;
for (x=0; x<size_max; ++x)
{
set_value(row, rowbytes, 2*x, bit_depth, luma, gamma_table,
conv);
set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table,
conv);
}
}
break;
case 3:
{
const png_uint_32 red = colors[1];
const png_uint_32 green = colors[2];
const png_uint_32 blue = colors[3];
png_uint_32 x;
for (x=0; x<=size_max; ++x)
{
set_value(row, rowbytes, 3*x+0, bit_depth, red, gamma_table,
conv);
set_value(row, rowbytes, 3*x+1, bit_depth, green, gamma_table,
conv);
set_value(row, rowbytes, 3*x+2, bit_depth, blue, gamma_table,
conv);
}
}
break;
case 4:
{
const png_uint_32 red = colors[1];
const png_uint_32 green = colors[2];
const png_uint_32 blue = colors[3];
const png_uint_32 alpha = colors[4];
png_uint_32 x;
for (x=0; x<=size_max; ++x)
{
set_value(row, rowbytes, 4*x+0, bit_depth, red, gamma_table,
conv);
set_value(row, rowbytes, 4*x+1, bit_depth, green, gamma_table,
conv);
set_value(row, rowbytes, 4*x+2, bit_depth, blue, gamma_table,
conv);
set_value(row, rowbytes, 4*x+3, bit_depth, alpha, gamma_table,
conv);
}
}
break;
default:
fprintf(stderr, "makepng: internal bad channel count\n");
exit(2);
}
else
{
fprintf(stderr,
"makepng: --color: count(%u) does not match channels(%u)\n",
colors[0], channels_of_type(color_type));
exit(1);
}
}
static void PNGCBAPI
makepng_warning(png_structp png_ptr, png_const_charp message)
{
const char **ep = png_get_error_ptr(png_ptr);
const char *name;
if (ep != NULL && *ep != NULL)
name = *ep;
else
name = "makepng";
fprintf(stderr, "%s: warning: %s\n", name, message);
}
static void PNGCBAPI
makepng_error(png_structp png_ptr, png_const_charp message)
{
makepng_warning(png_ptr, message);
png_longjmp(png_ptr, 1);
}
static int /* 0 on success, else an error code */
write_png(const char **name, FILE *fp, int color_type, int bit_depth,
volatile png_fixed_point gamma, chunk_insert * volatile insert,
unsigned int filters, unsigned int *colors)
{
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
name, makepng_error, makepng_warning);
volatile png_infop info_ptr = NULL;
volatile png_bytep row = NULL;
if (png_ptr == NULL)
{
fprintf(stderr, "makepng: OOM allocating write structure\n");
return 1;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_structp nv_ptr = png_ptr;
png_infop nv_info = info_ptr;
png_ptr = NULL;
info_ptr = NULL;
png_destroy_write_struct(&nv_ptr, &nv_info);
if (row != NULL) free(row);
return 1;
}
/* Allow benign errors so that we can write PNGs with errors */
png_set_benign_errors(png_ptr, 1/*allowed*/);
png_init_io(png_ptr, fp);
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
png_error(png_ptr, "OOM allocating info structure");
{
unsigned int size = image_size_of_type(color_type, bit_depth, colors);
png_fixed_point real_gamma = 45455; /* For sRGB */
png_byte gamma_table[256];
double conv;
/* This function uses the libpng values used on read to carry extra
* information about the gamma:
*/
if (gamma == PNG_GAMMA_MAC_18)
gamma = 65909;
else if (gamma > 0 && gamma < 1000)
gamma = PNG_FP_1;
if (gamma > 0)
real_gamma = gamma;
{
unsigned int i;
if (real_gamma == 45455) for (i=0; i<256; ++i)
{
gamma_table[i] = (png_byte)i;
conv = 1.;
}
else
{
/* Convert 'i' from sRGB (45455) to real_gamma, this makes
* the images look the same regardless of the gAMA chunk.
*/
conv = real_gamma;
conv /= 45455;
gamma_table[0] = 0;
for (i=0; i<255; ++i)
gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + 127.5);
gamma_table[255] = 255;
}
}
png_set_IHDR(png_ptr, info_ptr, size, size, bit_depth, color_type,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
if (color_type & PNG_COLOR_MASK_PALETTE)
{
int npalette;
png_color palette[256];
png_byte trans[256];
npalette = generate_palette(palette, trans, bit_depth, gamma_table,
colors);
png_set_PLTE(png_ptr, info_ptr, palette, npalette);
png_set_tRNS(png_ptr, info_ptr, trans, npalette-1,
NULL/*transparent color*/);
/* Reset gamma_table to prevent the image rows being changed */
for (npalette=0; npalette<256; ++npalette)
gamma_table[npalette] = (png_byte)npalette;
}
if (gamma == PNG_DEFAULT_sRGB)
png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE);
else if (gamma > 0) /* Else don't set color space information */
{
png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma);
/* Just use the sRGB values here. */
png_set_cHRM_fixed(png_ptr, info_ptr,
/* color x y */
/* white */ 31270, 32900,
/* red */ 64000, 33000,
/* green */ 30000, 60000,
/* blue */ 15000, 6000
);
}
/* Insert extra information. */
while (insert != NULL)
{
insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters);
insert = insert->next;
}
/* Write the file header. */
png_write_info(png_ptr, info_ptr);
/* Restrict the filters */
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters);
{
int passes = png_set_interlace_handling(png_ptr);
int pass;
png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
row = malloc(rowbytes);
if (row == NULL)
png_error(png_ptr, "OOM allocating row buffer");
for (pass = 0; pass < passes; ++pass)
{
unsigned int y;
for (y=0; y<size; ++y)
{
generate_row(row, rowbytes, y, color_type, bit_depth,
gamma_table, conv, colors);
png_write_row(png_ptr, row);
}
}
}
}
/* Finish writing the file. */
png_write_end(png_ptr, info_ptr);
{
png_structp nv_ptr = png_ptr;
png_infop nv_info = info_ptr;
png_ptr = NULL;
info_ptr = NULL;
png_destroy_write_struct(&nv_ptr, &nv_info);
}
free(row);
return 0;
}
static size_t
load_file(png_const_charp name, png_bytepp result)
{
FILE *fp = tmpfile();
if (fp != NULL)
{
FILE *ip = fopen(name, "rb");
if (ip != NULL)
{
size_t total = 0;
int ch;
for (;;)
{
ch = getc(ip);
if (ch == EOF) break;
putc(ch, fp);
++total;
}
if (ferror(ip))
{
perror(name);
fprintf(stderr, "%s: read error\n", name);
(void)fclose(ip);
}
else
{
(void)fclose(ip);
if (ferror(fp))
{
perror("temporary file");
fprintf(stderr, "temporary file write error\n");
}
else
{
rewind(fp);
if (total > 0)
{
/* Round up to a multiple of 4 here to allow an iCCP profile
* to be padded to a 4x boundary.
*/
png_bytep data = malloc((total+3)&~3);
if (data != NULL)
{
size_t new_size = 0;
for (;;)
{
ch = getc(fp);
if (ch == EOF) break;
data[new_size++] = (png_byte)ch;
}
if (ferror(fp) || new_size != total)
{
perror("temporary file");
fprintf(stderr, "temporary file read error\n");
free(data);
}
else
{
(void)fclose(fp);
*result = data;
return total;
}
}
else
fprintf(stderr, "%s: out of memory loading file\n", name);
}
else
fprintf(stderr, "%s: empty file\n", name);
}
}
}
else
{
perror(name);
fprintf(stderr, "%s: open failed\n", name);
}
fclose(fp);
}
else
fprintf(stderr, "makepng: %s: could not open temporary file\n", name);
exit(1);
return 0;
}
static png_size_t
load_fake(png_charp param, png_bytepp profile)
{
char *endptr = NULL;
unsigned long long int size = strtoull(param, &endptr, 0/*base*/);
/* The 'fake' format is <number>*[string] */
if (endptr != NULL && *endptr == '*')
{
size_t len = strlen(++endptr);
size_t result = (size_t)size;
if (len == 0) len = 1; /* capture the terminating '\0' */
/* Now repeat that string to fill 'size' bytes. */
if (result == size && (*profile = malloc(result)) != NULL)
{
png_bytep out = *profile;
if (len == 1)
memset(out, *endptr, result);
else
{
while (size >= len)
{
memcpy(out, endptr, len);
out += len;
size -= len;
}
memcpy(out, endptr, size);
}
return result;
}
else
{
fprintf(stderr, "%s: size exceeds system limits\n", param);
exit(1);
}
}
return 0;
}
static void
check_param_count(int nparams, int expect)
{
if (nparams != expect)
{
fprintf(stderr, "bad parameter count (internal error)\n");
exit(1);
}
}
static void
insert_iCCP(png_structp png_ptr, png_infop info_ptr, int nparams,
png_charpp params)
{
png_bytep profile = NULL;
png_uint_32 proflen = 0;
int result;
check_param_count(nparams, 2);
switch (params[1][0])
{
case '<':
{
png_size_t filelen = load_file(params[1]+1, &profile);
if (filelen > 0xfffffffc) /* Maximum profile length */
{
fprintf(stderr, "%s: file too long (%lu) for an ICC profile\n",
params[1]+1, (unsigned long)filelen);
exit(1);
}
proflen = (png_uint_32)filelen;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
png_size_t fake_len = load_fake(params[1], &profile);
if (fake_len > 0) /* else a simple parameter */
{
if (fake_len > 0xffffffff) /* Maximum profile length */
{
fprintf(stderr,
"%s: fake data too long (%lu) for an ICC profile\n",
params[1], (unsigned long)fake_len);
exit(1);
}
proflen = (png_uint_32)(fake_len & ~3U);
/* Always fix up the profile length. */
png_save_uint_32(profile, proflen);
break;
}
}
default:
fprintf(stderr, "--insert iCCP \"%s\": unrecognized\n", params[1]);
fprintf(stderr, " use '<' to read a file: \"<filename\"\n");
exit(1);
}
result = 1;
if (proflen & 3)
{
fprintf(stderr,
"makepng: --insert iCCP %s: profile length made a multiple of 4\n",
params[1]);
/* load_file allocates extra space for this padding, the ICC spec requires
* padding with zero bytes.
*/
while (proflen & 3)
profile[proflen++] = 0;
}
if (profile != NULL && proflen > 3)
{
png_uint_32 prof_header = png_get_uint_32(profile);
if (prof_header != proflen)
{
fprintf(stderr, "--insert iCCP %s: profile length field wrong:\n",
params[1]);
fprintf(stderr, " actual %lu, recorded value %lu (corrected)\n",
(unsigned long)proflen, (unsigned long)prof_header);
png_save_uint_32(profile, proflen);
}
}
if (result && profile != NULL && proflen >=4)
png_set_iCCP(png_ptr, info_ptr, params[0], PNG_COMPRESSION_TYPE_BASE,
profile, proflen);
if (profile)
free(profile);
if (!result)
exit(1);
}
static void
clear_text(png_text *text, png_charp keyword)
{
text->compression = -1; /* none */
text->key = keyword;
text->text = NULL;
text->text_length = 0; /* libpng calculates this */
text->itxt_length = 0; /* libpng calculates this */
text->lang = NULL;
text->lang_key = NULL;
}
static void
set_text(png_structp png_ptr, png_infop info_ptr, png_textp text,
png_charp param)
{
switch (param[0])
{
case '<':
{
png_bytep file = NULL;
text->text_length = load_file(param+1, &file);
text->text = (png_charp)file;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
png_bytep data = NULL;
png_size_t fake_len = load_fake(param, &data);
if (fake_len > 0) /* else a simple parameter */
{
text->text_length = fake_len;
text->text = (png_charp)data;
break;
}
}
default:
text->text = param;
break;
}
png_set_text(png_ptr, info_ptr, text, 1);
if (text->text != param)
free(text->text);
}
static void
insert_tEXt(png_structp png_ptr, png_infop info_ptr, int nparams,
png_charpp params)
{
png_text text;
check_param_count(nparams, 2);
clear_text(&text, params[0]);
set_text(png_ptr, info_ptr, &text, params[1]);
}
static void
insert_zTXt(png_structp png_ptr, png_infop info_ptr, int nparams,
png_charpp params)
{
png_text text;
check_param_count(nparams, 2);
clear_text(&text, params[0]);
text.compression = 0; /* deflate */
set_text(png_ptr, info_ptr, &text, params[1]);
}
static void
insert_iTXt(png_structp png_ptr, png_infop info_ptr, int nparams,
png_charpp params)
{
png_text text;
check_param_count(nparams, 4);
clear_text(&text, params[0]);
text.compression = 2; /* iTXt + deflate */
text.lang = params[1];/* language tag */
text.lang_key = params[2]; /* translated keyword */
set_text(png_ptr, info_ptr, &text, params[3]);
}
static void
insert_hIST(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params)
{
int i;
png_uint_16 freq[256];
/* libpng takes the count from the PLTE count; we don't check it here but we
* do set the array to 0 for unspecified entries.
*/
memset(freq, 0, sizeof freq);
for (i=0; i<nparams; ++i)
{
char *endptr = NULL;
unsigned long int l = strtoul(params[i], &endptr, 0/*base*/);
if (params[i][0] && *endptr == 0 && l <= 65535)
freq[i] = (png_uint_16)l;
else
{
fprintf(stderr, "hIST[%d]: %s: invalid frequency\n", i, params[i]);
exit(1);
}
}
png_set_hIST(png_ptr, info_ptr, freq);
}
#if 0
static void
insert_sPLT(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params)
{
fprintf(stderr, "insert sPLT: NYI\n");
}
#endif
static int
find_parameters(png_const_charp what, png_charp param, png_charp *list,
int nparams)
{
/* Parameters are separated by '\n' or ':' characters, up to nparams are
* accepted (more is an error) and the number found is returned.
*/
int i;
for (i=0; *param && i<nparams; ++i)
{
list[i] = param;
while (*++param) if (*param == '\n' || *param == ':')
{
*param++ = 0; /* Terminate last parameter */
break; /* And start a new one. */
}
}
if (*param)
{
fprintf(stderr, "--insert %s: too many parameters (%s)\n", what, param);
exit(1);
}
list[i] = NULL; /* terminates list */
return i; /* number of parameters filled in */
}
static void
bad_parameter_count(png_const_charp what, int nparams)
{
fprintf(stderr, "--insert %s: bad parameter count %d\n", what, nparams);
exit(1);
}
static chunk_insert *
make_insert(png_const_charp what,
void (*insert)(png_structp, png_infop, int, png_charpp),
int nparams, png_charpp list)
{
int i;
chunk_insert *cip;
cip = malloc(offsetof(chunk_insert,parameters) +
nparams * sizeof (png_charp));
if (cip == NULL)
{
fprintf(stderr, "--insert %s: out of memory allocating %d parameters\n",
what, nparams);
exit(1);
}
cip->next = NULL;
cip->insert = insert;
cip->nparams = nparams;
for (i=0; i<nparams; ++i)
cip->parameters[i] = list[i];
return cip;
}
static chunk_insert *
find_insert(png_const_charp what, png_charp param)
{
png_uint_32 chunk = 0;
png_charp parameter_list[1024];
int i, nparams;
/* Assemble the chunk name */
for (i=0; i<4; ++i)
{
char ch = what[i];
if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122))
chunk = (chunk << 8) + what[i];
else
break;
}
if (i < 4 || what[4] != 0)
{
fprintf(stderr, "makepng --insert \"%s\": invalid chunk name\n", what);
exit(1);
}
/* Assemble the parameter list. */
nparams = find_parameters(what, param, parameter_list, 1024);
# define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d))
switch (chunk)
{
case CHUNK(105,67,67,80): /* iCCP */
if (nparams == 2)
return make_insert(what, insert_iCCP, nparams, parameter_list);
break;
case CHUNK(116,69,88,116): /* tEXt */
if (nparams == 2)
return make_insert(what, insert_tEXt, nparams, parameter_list);
break;
case CHUNK(122,84,88,116): /* zTXt */
if (nparams == 2)
return make_insert(what, insert_zTXt, nparams, parameter_list);
break;
case CHUNK(105,84,88,116): /* iTXt */
if (nparams == 4)
return make_insert(what, insert_iTXt, nparams, parameter_list);
break;
case CHUNK(104,73,83,84): /* hIST */
if (nparams <= 256)
return make_insert(what, insert_hIST, nparams, parameter_list);
break;
#if 0
case CHUNK(115,80,76,84): /* sPLT */
return make_insert(what, insert_sPLT, nparams, parameter_list);
#endif
default:
fprintf(stderr, "makepng --insert \"%s\": unrecognized chunk name\n",
what);
exit(1);
}
bad_parameter_count(what, nparams);
return NULL;
}
/* This is a not-very-good parser for a sequence of numbers (including 0). It
* doesn't accept some apparently valid things, but it accepts all the sensible
* combinations.
*/
static void
parse_color(char *arg, unsigned int *colors)
{
unsigned int ncolors = 0;
while (*arg && ncolors < 4)
{
char *ep = arg;
unsigned long ul = strtoul(arg, &ep, 0);
if (ul > 65535)
{
fprintf(stderr, "makepng --color=...'%s': too big\n", arg);
exit(1);
}
if (ep == arg)
{
fprintf(stderr, "makepng --color=...'%s': not a valid color\n", arg);
exit(1);
}
if (*ep) ++ep; /* skip a separator */
arg = ep;
colors[++ncolors] = (unsigned int)ul; /* checked above */
}
if (*arg)
{
fprintf(stderr, "makepng --color=...'%s': too many values\n", arg);
exit(1);
}
*colors = ncolors;
}
int
main(int argc, char **argv)
{
FILE *fp = stdout;
const char *file_name = NULL;
int color_type = 8; /* invalid */
int bit_depth = 32; /* invalid */
unsigned int colors[5];
unsigned int filters = PNG_ALL_FILTERS;
png_fixed_point gamma = 0; /* not set */
chunk_insert *head_insert = NULL;
chunk_insert **insert_ptr = &head_insert;
memset(colors, 0, sizeof colors);
while (--argc > 0)
{
char *arg = *++argv;
if (strcmp(arg, "--sRGB") == 0)
{
gamma = PNG_DEFAULT_sRGB;
continue;
}
if (strcmp(arg, "--linear") == 0)
{
gamma = PNG_FP_1;
continue;
}
if (strcmp(arg, "--1.8") == 0)
{
gamma = PNG_GAMMA_MAC_18;
continue;
}
if (strcmp(arg, "--nofilters") == 0)
{
filters = PNG_FILTER_NONE;
continue;
}
if (strncmp(arg, "--color=", 8) == 0)
{
parse_color(arg+8, colors);
continue;
}
if (argc >= 3 && strcmp(arg, "--insert") == 0)
{
png_const_charp what = *++argv;
png_charp param = *++argv;
chunk_insert *new_insert;
argc -= 2;
new_insert = find_insert(what, param);
if (new_insert != NULL)
{
*insert_ptr = new_insert;
insert_ptr = &new_insert->next;
}
continue;
}
if (arg[0] == '-')
{
fprintf(stderr, "makepng: %s: invalid option\n", arg);
exit(1);
}
if (strcmp(arg, "palette") == 0)
{
color_type = PNG_COLOR_TYPE_PALETTE;
continue;
}
if (strncmp(arg, "gray", 4) == 0)
{
if (arg[4] == 0)
{
color_type = PNG_COLOR_TYPE_GRAY;
continue;
}
else if (strcmp(arg+4, "a") == 0 ||
strcmp(arg+4, "alpha") == 0 ||
strcmp(arg+4, "-alpha") == 0)
{
color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
continue;
}
}
if (strncmp(arg, "rgb", 3) == 0)
{
if (arg[3] == 0)
{
color_type = PNG_COLOR_TYPE_RGB;
continue;
}
else if (strcmp(arg+3, "a") == 0 ||
strcmp(arg+3, "alpha") == 0 ||
strcmp(arg+3, "-alpha") == 0)
{
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
continue;
}
}
if (color_type == 8 && isdigit(arg[0]))
{
color_type = atoi(arg);
if (color_type < 0 || color_type > 6 || color_type == 1 ||
color_type == 5)
{
fprintf(stderr, "makepng: %s: not a valid color type\n", arg);
exit(1);
}
continue;
}
if (bit_depth == 32 && isdigit(arg[0]))
{
bit_depth = atoi(arg);
if (bit_depth <= 0 || bit_depth > 16 ||
(bit_depth & -bit_depth) != bit_depth)
{
fprintf(stderr, "makepng: %s: not a valid bit depth\n", arg);
exit(1);
}
continue;
}
if (argc == 1) /* It's the file name */
{
fp = fopen(arg, "wb");
if (fp == NULL)
{
fprintf(stderr, "%s: %s: could not open\n", arg, strerror(errno));
exit(1);
}
file_name = arg;
continue;
}
fprintf(stderr, "makepng: %s: unknown argument\n", arg);
exit(1);
} /* argument while loop */
if (color_type == 8 || bit_depth == 32)
{
fprintf(stderr, "usage: makepng [--sRGB|--linear|--1.8] "
"[--color=...] color-type bit-depth [file-name]\n"
" Make a test PNG file, by default writes to stdout.\n");
exit(1);
}
/* Check the colors */
{
const unsigned int lim = (color_type == PNG_COLOR_TYPE_PALETTE ? 255U :
(1U<<bit_depth)-1);
unsigned int i;
for (i=1; i<=colors[0]; ++i)
if (colors[i] > lim)
{
fprintf(stderr, "makepng: --color=...: %u out of range [0..%u]\n",
colors[i], lim);
exit(1);
}
}
/* Restrict the filters for more speed to those we know are used for the
* generated images.
*/
if (filters == PNG_ALL_FILTERS)
{
if ((color_type & PNG_COLOR_MASK_PALETTE) != 0 || bit_depth < 8)
filters = PNG_FILTER_NONE;
else if (color_type & PNG_COLOR_MASK_COLOR) /* rgb */
{
if (bit_depth == 8)
filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG);
else
filters = PNG_FILTER_SUB | PNG_FILTER_PAETH;
}
else /* gray 8 or 16-bit */
filters &= ~PNG_FILTER_NONE;
}
{
int ret = write_png(&file_name, fp, color_type, bit_depth, gamma,
head_insert, filters, colors);
if (ret != 0 && file_name != NULL)
remove(file_name);
return ret;
}
}
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