1220 lines
32 KiB
C
1220 lines
32 KiB
C
/* makepng.c
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*
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* Copyright (c) 2012 John Cunningham Bowler
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*
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* Last changed in libpng 1.6.0 [(PENDING RELEASE)]
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* Make a test PNG image. The arguments are as follows:
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*
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* makepng [--sRGB|--linear|--1.8] color-type bit-depth [file-name]
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*
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* The color-type may be numeric (and must match the numbers used by the PNG
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* specification) or one of the format names listed below. The bit-depth is the
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* component bit depth, or the pixel bit-depth for a color-mapped image.
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*
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* Without any options no color-space information is written, with the options
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* an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the
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* display system used on older Apple computers to correct for high ambient
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* light levels in the viewing environment; it applies a transform of
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* approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909
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* is written (1.45/2.2).
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*
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* The image data is generated internally. The images used are as follows:
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*
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* 1 channel: a square image with a diamond, the least luminous colors are on
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* the edge of the image, the most luminous in the center.
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*
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* 2 channels: the color channel increases in luminosity from top to bottom, the
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* alpha channel increases in opacity from left to right.
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*
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* 3 channels: linear combinations of, from the top-left corner clockwise,
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* black, green, white, red.
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*
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* 4 channels: linear combinations of, from the top-left corner clockwise,
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* transparent, red, green, blue.
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*
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* For color-mapped images a four channel color-map is used and the PNG file has
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* a tRNS chunk, as follows:
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*
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* 1-bit: entry 0 is transparent-red, entry 1 is opaque-white
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* 2-bit: entry 0: transparent-green
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* entry 1: 40%-red
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* entry 2: 80%-blue
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* entry 3: opaque-white
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* 4-bit: the 16 combinations of the 2-bit case
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* 8-bit: the 256 combinations of the 4-bit case
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*
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* The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The
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* image is the 1-channel diamond, but using palette index, not luminosity.
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*
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* Image size is determined by the final pixel depth in bits, i.e. channels x
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* bit-depth, as follows:
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*
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* 8 bits or less: 64x64
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* 16 bits: 256x256
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* More than 16 bits: 1024x1024
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*
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* Row filtering is turned off (the 'none' filter is used on every row) and the
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* images are not interlaced.
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*
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* If file-name is given then the PNG is written to that file, else it is
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* written to stdout. Notice that stdout is not supported on systems where, by
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* default, it assumes text output; this program makes no attempt to change the
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* text mode of stdout!
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*/
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#define _ISOC99_SOURCE /* for strtoull */
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#include <stddef.h> /* for offsetof */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <errno.h>
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#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H)
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# include <config.h>
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#endif
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/* Define the following to use this test against your installed libpng, rather
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* than the one being built here:
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*/
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#ifdef PNG_FREESTANDING_TESTS
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# include <png.h>
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#else
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# include "../../png.h"
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#endif
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/* This structure is used for inserting extra chunks (the --insert argument, not
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* documented above.)
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*/
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typedef struct chunk_insert
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{
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struct chunk_insert *next;
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void (*insert)(png_structp, png_infop, int, png_charpp);
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int nparams;
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png_charp parameters[1];
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} chunk_insert;
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static int
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channels_of_type(int color_type)
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{
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if (color_type & PNG_COLOR_MASK_PALETTE)
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return 1;
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else
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{
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int channels = 1;
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if (color_type & PNG_COLOR_MASK_COLOR)
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channels = 3;
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if (color_type & PNG_COLOR_MASK_ALPHA)
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return channels + 1;
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else
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return channels;
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}
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}
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static int
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pixel_depth_of_type(int color_type, int bit_depth)
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{
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return channels_of_type(color_type) * bit_depth;
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}
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static unsigned int
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image_size_of_type(int color_type, int bit_depth)
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{
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int pixel_depth = pixel_depth_of_type(color_type, bit_depth);
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if (pixel_depth < 8)
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return 64;
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else if (pixel_depth > 16)
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return 1024;
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else
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return 256;
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}
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static void
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set_color(png_colorp color, png_bytep trans, unsigned int red,
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unsigned int green, unsigned int blue, unsigned int alpha,
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png_const_bytep gamma_table)
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{
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color->red = gamma_table[red];
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color->green = gamma_table[green];
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color->blue = gamma_table[blue];
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*trans = (png_byte)alpha;
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}
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static int
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generate_palette(png_colorp palette, png_bytep trans, int bit_depth,
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png_const_bytep gamma_table)
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{
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/*
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* 1-bit: entry 0 is transparent-red, entry 1 is opaque-white
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* 2-bit: entry 0: transparent-green
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* entry 1: 40%-red
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* entry 2: 80%-blue
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* entry 3: opaque-white
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* 4-bit: the 16 combinations of the 2-bit case
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* 8-bit: the 256 combinations of the 4-bit case
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*/
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if (bit_depth == 1)
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{
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set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table);
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set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table);
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return 2;
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}
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else
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{
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unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */
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unsigned int x, y, ip;
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for (x=0; x<size; ++x) for (y=0; y<size; ++y)
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{
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ip = x + (size * y);
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/* size is at most 16, so the scaled value below fits in 16 bits */
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# define interp(pos, c1, c2) ((pos * c1) + ((size-pos) * c2))
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# define xyinterp(x, y, c1, c2, c3, c4) (((size * size / 2) +\
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(interp(x, c1, c2) * y + (size-y) * interp(x, c3, c4))) /\
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(size*size))
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set_color(palette+ip, trans+ip,
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/* color: green, red,blue,white */
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xyinterp(x, y, 0, 255, 0, 255),
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xyinterp(x, y, 255, 0, 0, 255),
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xyinterp(x, y, 0, 0, 255, 255),
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/* alpha: 0, 102, 204, 255) */
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xyinterp(x, y, 0, 102, 204, 255),
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gamma_table);
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}
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return ip+1;
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}
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}
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static void
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set_value(png_bytep row, size_t rowbytes, png_uint_32 x, unsigned int bit_depth,
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png_uint_32 value, png_const_bytep gamma_table, double conv)
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{
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unsigned int mask = (1U << bit_depth)-1;
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x *= bit_depth; /* Maxium x is 4*1024, maxium bit_depth is 16 */
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if (value <= mask)
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{
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png_uint_32 offset = x >> 3;
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if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes))
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{
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row += offset;
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switch (bit_depth)
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{
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case 1:
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case 2:
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case 4:
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/* Don't gamma correct - values get smashed */
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{
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unsigned int shift = (8 - bit_depth) - (x & 0x7U);
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mask <<= shift;
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value = (value << shift) & mask;
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*row = (png_byte)((*row & ~mask) | value);
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}
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return;
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default:
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fprintf(stderr, "makepng: bad bit depth (internal error)\n");
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exit(1);
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case 16:
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value = (unsigned int)floor(65535*pow(value/65535.,conv)+.5);
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*row++ = (png_byte)(value >> 8);
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*row = (png_byte)value;
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return;
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case 8:
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*row = gamma_table[value];
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return;
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}
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}
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else
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{
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fprintf(stderr, "makepng: row buffer overflow (internal error)\n");
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exit(1);
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}
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}
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else
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{
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fprintf(stderr, "makepng: component overflow (internal error)\n");
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exit(1);
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}
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}
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static void
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generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type,
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int bit_depth, png_const_bytep gamma_table, double conv)
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{
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png_uint_32 size_max = image_size_of_type(color_type, bit_depth)-1;
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png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */
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switch (channels_of_type(color_type))
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{
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/* 1 channel: a square image with a diamond, the least luminous colors are on
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* the edge of the image, the most luminous in the center.
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*/
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case 1:
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{
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png_uint_32 x;
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png_uint_32 base = 2*size_max - abs(2*y-size_max);
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for (x=0; x<=size_max; ++x)
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{
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png_uint_32 luma = base - abs(2*x-size_max);
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/* 'luma' is now in the range 0..2*size_max, we need
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* 0..depth_max
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*/
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luma = (luma*depth_max + size_max) / (2*size_max);
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set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv);
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}
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}
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break;
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/* 2 channels: the color channel increases in luminosity from top to bottom,
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* the alpha channel increases in opacity from left to right.
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*/
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case 2:
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{
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png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max);
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png_uint_32 x;
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for (x=0; x<=size_max; ++x)
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{
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set_value(row, rowbytes, 2*x, bit_depth,
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(depth_max * x * 2 + size_max) / (2 * size_max), gamma_table,
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conv);
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set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table,
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conv);
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}
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}
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break;
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/* 3 channels: linear combinations of, from the top-left corner clockwise,
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* black, green, white, red.
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*/
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case 3:
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{
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/* x0: the black->red scale (the value of the red component) at the
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* start of the row (blue and green are 0).
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* x1: the green->white scale (the value of the red and blue
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* components at the end of the row; green is depth_max).
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*/
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png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max);
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png_uint_32 x;
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/* Interpolate x/depth_max from start to end:
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*
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* start end difference
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* red: Y Y 0
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* green: 0 depth_max depth_max
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* blue: 0 Y Y
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*/
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for (x=0; x<=size_max; ++x)
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{
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set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y,
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gamma_table, conv);
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set_value(row, rowbytes, 3*x+1, bit_depth, /* green */
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(depth_max * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */
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(Y * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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}
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}
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break;
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/* 4 channels: linear combinations of, from the top-left corner clockwise,
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* transparent, red, green, blue.
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*/
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case 4:
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{
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/* x0: the transparent->blue scale (the value of the blue and alpha
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* components) at the start of the row (red and green are 0).
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* x1: the red->green scale (the value of the red and green
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* components at the end of the row; blue is 0 and alpha is
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* depth_max).
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*/
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png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max);
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png_uint_32 x;
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/* Interpolate x/depth_max from start to end:
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*
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* start end difference
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* red: 0 depth_max-Y depth_max-Y
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* green: 0 Y Y
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* blue: Y 0 -Y
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* alpha: Y depth_max depth_max-Y
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*/
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for (x=0; x<=size_max; ++x)
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{
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set_value(row, rowbytes, 4*x+0, bit_depth, /* red */
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((depth_max-Y) * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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set_value(row, rowbytes, 4*x+1, bit_depth, /* green */
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(Y * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */
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Y - (Y * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */
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Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max),
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gamma_table, conv);
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}
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}
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break;
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default:
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fprintf(stderr, "makepng: internal bad channel count\n");
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exit(2);
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}
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}
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static int /* 0 on success, else an error code */
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write_png(FILE *fp, int color_type, int bit_depth,
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volatile png_fixed_point gamma, chunk_insert * volatile insert)
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{
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,0,0,0);
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volatile png_infop info_ptr = NULL;
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volatile png_bytep row = NULL;
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if (png_ptr == NULL)
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{
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fprintf(stderr, "makepng: OOM allocating write structure\n");
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return 1;
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}
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if (setjmp(png_jmpbuf(png_ptr)))
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{
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png_structp nv_ptr = png_ptr;
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png_infop nv_info = info_ptr;
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png_ptr = NULL;
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info_ptr = NULL;
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png_destroy_write_struct(&nv_ptr, &nv_info);
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if (row != NULL) free(row);
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return 1;
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}
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/* Allow benign errors so that we can write PNGs with errors */
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png_set_benign_errors(png_ptr, 1/*allowed*/);
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png_init_io(png_ptr, fp);
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info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL)
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png_error(png_ptr, "OOM allocating info structure");
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{
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unsigned int size = image_size_of_type(color_type, bit_depth);
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png_fixed_point real_gamma = 45455; /* For sRGB */
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png_byte gamma_table[256];
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double conv;
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/* This function uses the libpng values used on read to carry extra
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* information about the gamma:
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*/
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if (gamma == PNG_GAMMA_MAC_18)
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gamma = 65909;
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else if (gamma > 0 && gamma < 1000)
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gamma = PNG_FP_1;
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if (gamma > 0)
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real_gamma = gamma;
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{
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unsigned int i;
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if (real_gamma == 45455) for (i=0; i<256; ++i)
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{
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gamma_table[i] = (png_byte)i;
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conv = 1.;
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}
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else
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{
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/* Convert 'i' from sRGB (45455) to real_gamma, this makes
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* the images look the same regardless of the gAMA chunk.
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*/
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conv = real_gamma;
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conv /= 45455;
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gamma_table[0] = 0;
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for (i=0; i<255; ++i)
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gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + 127.5);
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gamma_table[255] = 255;
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}
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}
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png_set_IHDR(png_ptr, info_ptr, size, size, bit_depth, color_type,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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if (color_type & PNG_COLOR_MASK_PALETTE)
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{
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int npalette;
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png_color palette[256];
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png_byte trans[256];
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npalette = generate_palette(palette, trans, bit_depth, gamma_table);
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png_set_PLTE(png_ptr, info_ptr, palette, npalette);
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png_set_tRNS(png_ptr, info_ptr, trans, npalette-1,
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NULL/*transparent color*/);
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/* Reset gamma_table to prevent the image rows being changed */
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for (npalette=0; npalette<256; ++npalette)
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gamma_table[npalette] = (png_byte)npalette;
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}
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if (gamma == PNG_DEFAULT_sRGB)
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png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE);
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else if (gamma > 0) /* Else don't set color space information */
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{
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png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma);
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/* Just use the sRGB values here. */
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png_set_cHRM_fixed(png_ptr, info_ptr,
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/* color x y */
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/* white */ 31270, 32900,
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/* red */ 64000, 33000,
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/* green */ 30000, 60000,
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/* blue */ 15000, 6000
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);
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}
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/* Insert extra information. */
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while (insert != NULL)
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{
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insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters);
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insert = insert->next;
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|
}
|
|
|
|
/* Write the file header. */
|
|
png_write_info(png_ptr, info_ptr);
|
|
|
|
/* Restrict the filters */
|
|
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_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);
|
|
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)
|
|
{
|
|
png_bytep data = malloc(total);
|
|
|
|
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 > 0xffffffff) /* 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,
|
|
"--insert iCCP %s: profile length must be a multiple of 4\n",
|
|
params[1]);
|
|
result = 0; /* Cannot fix this! */
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
FILE *fp = stdout;
|
|
const char *file_name = NULL;
|
|
int color_type = 8; /* invalid */
|
|
int bit_depth = 32; /* invalid */
|
|
png_fixed_point gamma = 0; /* not set */
|
|
chunk_insert *head_insert = NULL;
|
|
chunk_insert **insert_ptr = &head_insert;
|
|
|
|
while (--argc > 0)
|
|
{
|
|
const 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 (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[5] == 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[4] == 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)
|
|
{
|
|
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)
|
|
{
|
|
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-type bit-depth [file-name]\n"
|
|
" Make a test PNG file, by default writes to stdout.\n");
|
|
exit(1);
|
|
}
|
|
|
|
{
|
|
int ret = write_png(fp, color_type, bit_depth, gamma, head_insert);
|
|
|
|
if (ret != 0 && file_name != NULL)
|
|
remove(file_name);
|
|
|
|
return ret;
|
|
}
|
|
}
|