You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1941 lines
53 KiB
1941 lines
53 KiB
/* makepng.c */ |
|
#define _ISOC99_SOURCE |
|
/* Copyright: */ |
|
#define COPYRIGHT "\251 2013,2015 John Cunningham Bowler" |
|
/* |
|
* Last changed in libpng 1.6.20 [November 24, 2015] |
|
* |
|
* 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] [--tRNS] [--nofilters] \ |
|
* 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 if --tRNS is |
|
* given 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. |
|
* |
|
* For formats other than color-mapped ones if --tRNS is specified a tRNS chunk |
|
* is generated with all channels equal to the low bits of 0x0101. |
|
* |
|
* 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 the libpng default but may be turned off (the 'none' filter |
|
* is used on every row) with the --nofilters option. |
|
* |
|
* The images are not interlaced. |
|
* |
|
* 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! |
|
* |
|
* makepng --color=<color> ... |
|
* |
|
* 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. |
|
* |
|
* makepng --small ... |
|
* |
|
* If --small is given the images are no larger than required to include every |
|
* possible pixel value for the format. |
|
* |
|
* For formats with pixels 8 bits or fewer in size the images consist of a |
|
* single row with 2^pixel-depth pixels, one of every possible value. |
|
* |
|
* For formats with 16-bit pixels a 256x256 image is generated containing every |
|
* possible pixel value. |
|
* |
|
* For larger pixel sizes a 256x256 image is generated where the first row |
|
* consists of each pixel that has identical byte values throughout the pixel |
|
* followed by rows where the byte values differ within the pixel. |
|
* |
|
* In all cases the pixel values are arranged in such a way that the SUB and UP |
|
* filters give byte sequences for maximal zlib compression. By default (if |
|
* --nofilters is not given) the SUB filter is used on the first row and the UP |
|
* filter on all following rows. |
|
* |
|
* The --small option is meant to provide good test-case coverage, however the |
|
* images are not easy to examine visually. Without the --small option the |
|
* images contain identical color values; the pixel values are adjusted |
|
* according to the gamma encoding with no gamma encoding being interpreted as |
|
* sRGB. |
|
* |
|
* LICENSING |
|
* ========= |
|
* |
|
* This code is copyright of the authors, see the COPYRIGHT define above. The |
|
* code is licensed as above, using the libpng license. The code generates |
|
* images which are solely the product of the code; the options choose which of |
|
* the many possibilities to generate. The images that result (but not the code |
|
* which generates them) are licensed as defined here: |
|
* |
|
* IMPORTANT: the COPYRIGHT #define must contain ISO-Latin-1 characters, the |
|
* IMAGE_LICENSING #define must contain UTF-8 characters. The 'copyright' |
|
* symbol 0xA9U (\251) in ISO-Latin-1 encoding and 0xC20xA9 (\302\251) in UTF-8. |
|
*/ |
|
#define IMAGE_LICENSING "Dedicated to the public domain per Creative Commons "\ |
|
"license \"CC0 1.0\"; https://creativecommons.org/publicdomain/zero/1.0/" |
|
|
|
#include <stddef.h> /* for offsetof */ |
|
#include <stdlib.h> |
|
#include <stdio.h> |
|
#include <string.h> |
|
#include <ctype.h> |
|
#include <math.h> |
|
#include <errno.h> |
|
#include <assert.h> |
|
#include <stdint.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 |
|
|
|
#include <zlib.h> |
|
|
|
/* Work round for GCC complaints about casting a (double) function result to |
|
* an unsigned: |
|
*/ |
|
static unsigned int |
|
flooru(double d) |
|
{ |
|
d = floor(d); |
|
return (unsigned int)d; |
|
} |
|
|
|
static png_byte |
|
floorb(double d) |
|
{ |
|
d = floor(d); |
|
return (png_byte)d; |
|
} |
|
|
|
/* 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 unsigned 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 unsigned 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, |
|
int small) |
|
{ |
|
if (*colors) |
|
return 16; |
|
|
|
else |
|
{ |
|
int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
|
|
|
if (small) |
|
{ |
|
if (pixel_depth <= 8) /* there will be one row */ |
|
return 1 << pixel_depth; |
|
|
|
else |
|
return 256; |
|
} |
|
|
|
else 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; |
|
volatile unsigned int ip = 0; |
|
|
|
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 = flooru(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 int /* filter mask for row */ |
|
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, int small) |
|
{ |
|
int filters = 0; /* file *MASK*, 0 means the default, not NONE */ |
|
png_uint_32 size_max = |
|
image_size_of_type(color_type, bit_depth, colors, small)-1; |
|
png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */ |
|
|
|
if (colors[0] == 0) if (small) |
|
{ |
|
unsigned int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
|
|
|
/* For pixel depths less than 16 generate a single row containing all the |
|
* possible pixel values. For 16 generate all 65536 byte pair |
|
* combinations in a 256x256 pixel array. |
|
*/ |
|
switch (pixel_depth) |
|
{ |
|
case 1: |
|
assert(y == 0 && rowbytes == 1 && size_max == 1); |
|
row[0] = 0x6CU; /* binary: 01101100, only top 2 bits used */ |
|
filters = PNG_FILTER_NONE; |
|
break; |
|
|
|
case 2: |
|
assert(y == 0 && rowbytes == 1 && size_max == 3); |
|
row[0] = 0x1BU; /* binary 00011011, all bits used */ |
|
filters = PNG_FILTER_NONE; |
|
break; |
|
|
|
case 4: |
|
assert(y == 0 && rowbytes == 8 && size_max == 15); |
|
row[0] = 0x01U; |
|
row[1] = 0x23U; /* SUB gives 0x22U for all following bytes */ |
|
row[2] = 0x45U; |
|
row[3] = 0x67U; |
|
row[4] = 0x89U; |
|
row[5] = 0xABU; |
|
row[6] = 0xCDU; |
|
row[7] = 0xEFU; |
|
filters = PNG_FILTER_SUB; |
|
break; |
|
|
|
case 8: |
|
/* The row will have all the pixel values in order starting with |
|
* '1', the SUB filter will change every byte into '1' (including |
|
* the last, which generates pixel value '0'). Since the SUB filter |
|
* has value 1 this should result in maximum compression. |
|
*/ |
|
assert(y == 0 && rowbytes == 256 && size_max == 255); |
|
for (;;) |
|
{ |
|
row[size_max] = 0xFFU & (size_max+1); |
|
if (size_max == 0) |
|
break; |
|
--size_max; |
|
} |
|
filters = PNG_FILTER_SUB; |
|
break; |
|
|
|
case 16: |
|
/* Rows are generated such that each row has a constant difference |
|
* between the first and second byte of each pixel and so that the |
|
* difference increases by 1 at each row. The rows start with the |
|
* first byte value of 0 and the value increases to 255 across the |
|
* row. |
|
* |
|
* The difference starts at 1, so the first row is: |
|
* |
|
* 0 1 1 2 2 3 3 4 ... 254 255 255 0 |
|
* |
|
* This means that running the SUB filter on the first row produces: |
|
* |
|
* [SUB==1] 0 1 0 1 0 1... |
|
* |
|
* Then the difference is 2 on the next row, giving: |
|
* |
|
* 0 2 1 3 2 4 3 5 ... 254 0 255 1 |
|
* |
|
* When the UP filter is run on this libpng produces: |
|
* |
|
* [UP ==2] 0 1 0 1 0 1... |
|
* |
|
* And so on for all the remain rows to the final two * rows: |
|
* |
|
* row 254: 0 255 1 0 2 1 3 2 4 3 ... 254 253 255 254 |
|
* row 255: 0 0 1 1 2 2 3 3 4 4 ... 254 254 255 255 |
|
*/ |
|
assert(rowbytes == 512 && size_max == 255); |
|
for (;;) |
|
{ |
|
row[2*size_max ] = 0xFFU & size_max; |
|
row[2*size_max+1] = 0xFFU & (size_max+y+1); |
|
if (size_max == 0) |
|
break; |
|
--size_max; |
|
} |
|
/* The first row must include PNG_FILTER_UP so that libpng knows we |
|
* need to keep it for the following row: |
|
*/ |
|
filters = (y == 0 ? PNG_FILTER_SUB+PNG_FILTER_UP : PNG_FILTER_UP); |
|
break; |
|
|
|
case 24: |
|
case 32: |
|
case 48: |
|
case 64: |
|
/* The rows are filled by an alogorithm similar to the above, in the |
|
* first row pixel bytes are all equal, increasing from 0 by 1 for |
|
* each pixel. In the second row the bytes within a pixel are |
|
* incremented 1,3,5,7,... from the previous row byte. Using an odd |
|
* number ensures all the possible byte values are used. |
|
*/ |
|
assert(size_max == 255 && rowbytes == 256*(pixel_depth>>3)); |
|
pixel_depth >>= 3; /* now in bytes */ |
|
while (rowbytes > 0) |
|
{ |
|
const size_t pixel_index = --rowbytes/pixel_depth; |
|
|
|
if (y == 0) |
|
row[rowbytes] = 0xFFU & pixel_index; |
|
|
|
else |
|
{ |
|
const size_t byte_offset = |
|
rowbytes - pixel_index * pixel_depth; |
|
|
|
row[rowbytes] = |
|
0xFFU & (pixel_index + (byte_offset * 2*y) + 1); |
|
} |
|
} |
|
filters = (y == 0 ? PNG_FILTER_SUB+PNG_FILTER_UP : PNG_FILTER_UP); |
|
break; |
|
|
|
default: |
|
assert(0/*NOT REACHED*/); |
|
} |
|
} |
|
|
|
else 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, 0, rowbytes); |
|
} |
|
|
|
else if (colors[0] == channels_of_type(color_type)) |
|
switch (channels_of_type(color_type)) |
|
{ |
|
case 1: |
|
{ |
|
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: |
|
{ |
|
png_uint_32 luma = colors[1]; |
|
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: |
|
{ |
|
png_uint_32 red = colors[1]; |
|
png_uint_32 green = colors[2]; |
|
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: |
|
{ |
|
png_uint_32 red = colors[1]; |
|
png_uint_32 green = colors[2]; |
|
png_uint_32 blue = colors[3]; |
|
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); |
|
} |
|
|
|
return filters; |
|
} |
|
|
|
|
|
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, int small, int tRNS) |
|
{ |
|
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*/); |
|
|
|
/* Max out the text compression level in an attempt to make the license |
|
* small. If --small then do the same for the IDAT. |
|
*/ |
|
if (small) |
|
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); |
|
|
|
png_set_text_compression_level(png_ptr, Z_BEST_COMPRESSION); |
|
|
|
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, small); |
|
unsigned int ysize; |
|
png_fixed_point real_gamma = 45455; /* For sRGB */ |
|
png_byte gamma_table[256]; |
|
double conv; |
|
|
|
/* Normally images are square, but with 'small' we want to simply generate |
|
* all the pixel values, or all that we reasonably can: |
|
*/ |
|
if (small) |
|
{ |
|
unsigned int pixel_depth = |
|
pixel_depth_of_type(color_type, bit_depth); |
|
|
|
if (pixel_depth <= 8U) |
|
{ |
|
assert(size == (1U<<pixel_depth)); |
|
ysize = 1U; |
|
} |
|
|
|
else |
|
{ |
|
assert(size == 256U); |
|
ysize = 256U; |
|
} |
|
} |
|
|
|
else |
|
ysize = size; |
|
|
|
/* 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=1; i<255; ++i) |
|
gamma_table[i] = floorb(pow(i/255.,conv) * 255 + .5); |
|
|
|
gamma_table[255] = 255; |
|
} |
|
} |
|
|
|
png_set_IHDR(png_ptr, info_ptr, size, ysize, 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); |
|
|
|
if (tRNS) |
|
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; |
|
} |
|
|
|
else if (tRNS) |
|
{ |
|
png_color_16 col; |
|
|
|
col.red = col.green = col.blue = col.gray = |
|
0x0101U & ((1U<<bit_depth)-1U); |
|
col.index = 0U; |
|
png_set_tRNS(png_ptr, info_ptr, NULL/*trans*/, 1U, &col); |
|
} |
|
|
|
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); |
|
|
|
{ |
|
# ifdef PNG_WRITE_INTERLACING_SUPPORTED |
|
int passes = png_set_interlace_handling(png_ptr); |
|
# else /* !WRITE_INTERLACING */ |
|
int passes = 1; |
|
# endif /* !WRITE_INTERLACING */ |
|
int pass; |
|
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<ysize; ++y) |
|
{ |
|
unsigned int row_filters = |
|
generate_row(row, rowbytes, y, color_type, bit_depth, |
|
gamma_table, conv, colors, small); |
|
|
|
if (row_filters != 0 && filters == PNG_ALL_FILTERS) |
|
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, row_filters); |
|
|
|
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 size_t |
|
load_fake(png_charp param, png_bytepp profile) |
|
{ |
|
char *endptr = NULL; |
|
uint64_t 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 '<': |
|
{ |
|
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': |
|
{ |
|
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; |
|
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); |
|
} |
|
|
|
static png_byte |
|
bval(png_const_structrp png_ptr, png_charp param, unsigned int maxval) |
|
{ |
|
char *endptr = NULL; |
|
unsigned long int l = strtoul(param, &endptr, 0/*base*/); |
|
|
|
if (param[0] && *endptr == 0 && l <= maxval) |
|
return (png_byte)l; |
|
|
|
else |
|
png_error(png_ptr, "sBIT: invalid sBIT value"); |
|
} |
|
|
|
static void |
|
insert_sBIT(png_structp png_ptr, png_infop info_ptr, int nparams, |
|
png_charpp params) |
|
{ |
|
int ct = png_get_color_type(png_ptr, info_ptr); |
|
int c = (ct & PNG_COLOR_MASK_COLOR ? 3 : 1) + |
|
(ct & PNG_COLOR_MASK_ALPHA ? 1 : 0); |
|
unsigned int maxval = |
|
ct & PNG_COLOR_MASK_PALETTE ? 8U : png_get_bit_depth(png_ptr, info_ptr); |
|
png_color_8 sBIT; |
|
|
|
if (nparams != c) |
|
png_error(png_ptr, "sBIT: incorrect parameter count"); |
|
|
|
if (ct & PNG_COLOR_MASK_COLOR) |
|
{ |
|
sBIT.red = bval(png_ptr, params[0], maxval); |
|
sBIT.green = bval(png_ptr, params[1], maxval); |
|
sBIT.blue = bval(png_ptr, params[2], maxval); |
|
sBIT.gray = 42; |
|
} |
|
|
|
else |
|
{ |
|
sBIT.red = sBIT.green = sBIT.blue = 42; |
|
sBIT.gray = bval(png_ptr, params[0], maxval); |
|
} |
|
|
|
if (ct & PNG_COLOR_MASK_ALPHA) |
|
sBIT.alpha = bval(png_ptr, params[nparams-1], maxval); |
|
|
|
else |
|
sBIT.alpha = 42; |
|
|
|
png_set_sBIT(png_ptr, info_ptr, &sBIT); |
|
} |
|
|
|
#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; |
|
|
|
case CHUNK(115,66,73,84): /* sBIT */ |
|
if (nparams <= 4) |
|
return make_insert(what, insert_sBIT, 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 necessary because libpng expects writeable strings for things like |
|
* text chunks (maybe this should be fixed...) |
|
*/ |
|
static png_charp |
|
strstash(png_const_charp foo) |
|
{ |
|
/* The program indicates a memory allocation error by crashing, this is by |
|
* design. |
|
*/ |
|
if (foo != NULL) |
|
{ |
|
png_charp bar = malloc(strlen(foo)+1); |
|
return strcpy(bar, foo); |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static png_charp |
|
strstash_list(const png_const_charp *text) |
|
{ |
|
size_t foo = 0; |
|
png_charp result, bar; |
|
const png_const_charp *line = text; |
|
|
|
while (*line != NULL) |
|
foo += strlen(*line++); |
|
|
|
result = bar = malloc(foo+1); |
|
|
|
line = text; |
|
while (*line != NULL) |
|
{ |
|
foo = strlen(*line); |
|
memcpy(bar, *line++, foo); |
|
bar += foo; |
|
} |
|
|
|
*bar = 0; |
|
return result; |
|
} |
|
|
|
/* These are used to insert Copyright and Licence fields, they allow the text to |
|
* have \n unlike the --insert option. |
|
*/ |
|
static chunk_insert * |
|
add_tEXt(const char *key, const png_const_charp *text) |
|
{ |
|
static char what[5] = { 116, 69, 88, 116, 0 }; |
|
png_charp parameter_list[3]; |
|
|
|
parameter_list[0] = strstash(key); |
|
parameter_list[1] = strstash_list(text); |
|
parameter_list[2] = NULL; |
|
|
|
return make_insert(what, insert_tEXt, 2, parameter_list); |
|
} |
|
|
|
static chunk_insert * |
|
add_iTXt(const char *key, const char *language, const char *language_key, |
|
const png_const_charp *text) |
|
{ |
|
static char what[5] = { 105, 84, 88, 116, 0 }; |
|
png_charp parameter_list[5]; |
|
|
|
parameter_list[0] = strstash(key); |
|
parameter_list[1] = strstash(language); |
|
parameter_list[2] = strstash(language_key); |
|
parameter_list[3] = strstash_list(text); |
|
parameter_list[4] = NULL; |
|
|
|
return make_insert(what, insert_iTXt, 4, parameter_list); |
|
} |
|
|
|
/* 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 */ |
|
int small = 0; /* make full size images */ |
|
int tRNS = 0; /* don't output a tRNS chunk */ |
|
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, "--small") == 0) |
|
{ |
|
small = 1; |
|
continue; |
|
} |
|
|
|
if (strcmp(arg, "--tRNS") == 0) |
|
{ |
|
tRNS = 1; |
|
continue; |
|
} |
|
|
|
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 [--small] [--sRGB|--linear|--1.8] " |
|
"[--color=...] color-type bit-depth [file-name]\n" |
|
" Make a test PNG file, by default writes to stdout.\n" |
|
" Other options are available, UTSL.\n"); |
|
exit(1); |
|
} |
|
|
|
/* Check the colors */ |
|
{ |
|
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); |
|
} |
|
} |
|
|
|
/* small and colors are incomparible (will probably crash if both are used at |
|
* the same time!) |
|
*/ |
|
if (small && colors[0] != 0) |
|
{ |
|
fprintf(stderr, "makepng: --color --small: only one at a time!\n"); |
|
exit(1); |
|
} |
|
|
|
/* Restrict the filters for more speed to those we know are used for the |
|
* generated images. |
|
*/ |
|
if (filters == PNG_ALL_FILTERS && !small/*small provides defaults*/) |
|
{ |
|
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; |
|
} |
|
|
|
/* Insert standard copyright and licence text. */ |
|
{ |
|
static png_const_charp copyright[] = |
|
{ |
|
COPYRIGHT, /* ISO-Latin-1 */ |
|
NULL |
|
}; |
|
static png_const_charp licensing[] = |
|
{ |
|
IMAGE_LICENSING, /* UTF-8 */ |
|
NULL |
|
}; |
|
|
|
chunk_insert *new_insert; |
|
|
|
new_insert = add_tEXt("Copyright", copyright); |
|
if (new_insert != NULL) |
|
{ |
|
*insert_ptr = new_insert; |
|
insert_ptr = &new_insert->next; |
|
} |
|
|
|
new_insert = add_iTXt("Licensing", "en", NULL, licensing); |
|
if (new_insert != NULL) |
|
{ |
|
*insert_ptr = new_insert; |
|
insert_ptr = &new_insert->next; |
|
} |
|
} |
|
|
|
{ |
|
int ret = write_png(&file_name, fp, color_type, bit_depth, gamma, |
|
head_insert, filters, colors, small, tRNS); |
|
|
|
if (ret != 0 && file_name != NULL) |
|
remove(file_name); |
|
|
|
return ret; |
|
} |
|
}
|
|
|