| /* makepng.c |
| * |
| * Copyright (c) 2013 John Cunningham Bowler |
| * |
| * Last changed in libpng 1.6.0 [February 14, 2013] |
| * |
| * This code is released under the libpng license. |
| * For conditions of distribution and use, see the disclaimer |
| * and license in png.h |
| * |
| * Make a test PNG image. The arguments are as follows: |
| * |
| * makepng [--sRGB|--linear|--1.8] [--color=<color>] color-type bit-depth \ |
| * [file-name] |
| * |
| * The color-type may be numeric (and must match the numbers used by the PNG |
| * specification) or one of the format names listed below. The bit-depth is the |
| * component bit depth, or the pixel bit-depth for a color-mapped image. |
| * |
| * Without any options no color-space information is written, with the options |
| * an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the |
| * display system used on older Apple computers to correct for high ambient |
| * light levels in the viewing environment; it applies a transform of |
| * approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909 |
| * is written (1.45/2.2). |
| * |
| * The image data is generated internally. Unless --color is given the images |
| * used are as follows: |
| * |
| * 1 channel: a square image with a diamond, the least luminous colors are on |
| * the edge of the image, the most luminous in the center. |
| * |
| * 2 channels: the color channel increases in luminosity from top to bottom, the |
| * alpha channel increases in opacity from left to right. |
| * |
| * 3 channels: linear combinations of, from the top-left corner clockwise, |
| * black, green, white, red. |
| * |
| * 4 channels: linear combinations of, from the top-left corner clockwise, |
| * transparent, red, green, blue. |
| * |
| * For color-mapped images a four channel color-map is used and the PNG file has |
| * a tRNS chunk, as follows: |
| * |
| * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| * 2-bit: entry 0: transparent-green |
| * entry 1: 40%-red |
| * entry 2: 80%-blue |
| * entry 3: opaque-white |
| * 4-bit: the 16 combinations of the 2-bit case |
| * 8-bit: the 256 combinations of the 4-bit case |
| * |
| * The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The |
| * image is the 1-channel diamond, but using palette index, not luminosity. |
| * |
| * Image size is determined by the final pixel depth in bits, i.e. channels x |
| * bit-depth, as follows: |
| * |
| * 8 bits or less: 64x64 |
| * 16 bits: 256x256 |
| * More than 16 bits: 1024x1024 |
| * |
| * Row filtering is turned off (the 'none' filter is used on every row) and the |
| * images are not interlaced. |
| * |
| * If --color is given then the whole image has that color, color-mapped images |
| * will have exactly one palette entry and all image files with be 16x16 in |
| * size. The color value is 1 to 4 decimal numbers as appropriate for the color |
| * type. |
| * |
| * If file-name is given then the PNG is written to that file, else it is |
| * written to stdout. Notice that stdout is not supported on systems where, by |
| * default, it assumes text output; this program makes no attempt to change the |
| * text mode of stdout! |
| */ |
| #define _ISOC99_SOURCE /* for strtoull */ |
| |
| #include <stddef.h> /* for offsetof */ |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <math.h> |
| #include <errno.h> |
| |
| #if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) |
| # include <config.h> |
| #endif |
| |
| /* Define the following to use this test against your installed libpng, rather |
| * than the one being built here: |
| */ |
| #ifdef PNG_FREESTANDING_TESTS |
| # include <png.h> |
| #else |
| # include "../../png.h" |
| #endif |
| |
| /* This structure is used for inserting extra chunks (the --insert argument, not |
| * documented above.) |
| */ |
| typedef struct chunk_insert |
| { |
| struct chunk_insert *next; |
| void (*insert)(png_structp, png_infop, int, png_charpp); |
| int nparams; |
| png_charp parameters[1]; |
| } chunk_insert; |
| |
| static int |
| channels_of_type(int color_type) |
| { |
| if (color_type & PNG_COLOR_MASK_PALETTE) |
| return 1; |
| |
| else |
| { |
| int channels = 1; |
| |
| if (color_type & PNG_COLOR_MASK_COLOR) |
| channels = 3; |
| |
| if (color_type & PNG_COLOR_MASK_ALPHA) |
| return channels + 1; |
| |
| else |
| return channels; |
| } |
| } |
| |
| static int |
| pixel_depth_of_type(int color_type, int bit_depth) |
| { |
| return channels_of_type(color_type) * bit_depth; |
| } |
| |
| static unsigned int |
| image_size_of_type(int color_type, int bit_depth, unsigned int *colors) |
| { |
| if (*colors) |
| return 16; |
| |
| else |
| { |
| int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
| |
| if (pixel_depth < 8) |
| return 64; |
| |
| else if (pixel_depth > 16) |
| return 1024; |
| |
| else |
| return 256; |
| } |
| } |
| |
| static void |
| set_color(png_colorp color, png_bytep trans, unsigned int red, |
| unsigned int green, unsigned int blue, unsigned int alpha, |
| png_const_bytep gamma_table) |
| { |
| color->red = gamma_table[red]; |
| color->green = gamma_table[green]; |
| color->blue = gamma_table[blue]; |
| *trans = (png_byte)alpha; |
| } |
| |
| static int |
| generate_palette(png_colorp palette, png_bytep trans, int bit_depth, |
| png_const_bytep gamma_table, unsigned int *colors) |
| { |
| /* |
| * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| * 2-bit: entry 0: transparent-green |
| * entry 1: 40%-red |
| * entry 2: 80%-blue |
| * entry 3: opaque-white |
| * 4-bit: the 16 combinations of the 2-bit case |
| * 8-bit: the 256 combinations of the 4-bit case |
| */ |
| switch (colors[0]) |
| { |
| default: |
| fprintf(stderr, "makepng: --colors=...: invalid count %u\n", |
| colors[0]); |
| exit(1); |
| |
| case 1: |
| set_color(palette+0, trans+0, colors[1], colors[1], colors[1], 255, |
| gamma_table); |
| return 1; |
| |
| case 2: |
| set_color(palette+0, trans+0, colors[1], colors[1], colors[1], |
| colors[2], gamma_table); |
| return 1; |
| |
| case 3: |
| set_color(palette+0, trans+0, colors[1], colors[2], colors[3], 255, |
| gamma_table); |
| return 1; |
| |
| case 4: |
| set_color(palette+0, trans+0, colors[1], colors[2], colors[3], |
| colors[4], gamma_table); |
| return 1; |
| |
| case 0: |
| if (bit_depth == 1) |
| { |
| set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table); |
| set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table); |
| return 2; |
| } |
| |
| else |
| { |
| unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */ |
| unsigned int x, y, ip; |
| |
| for (x=0; x<size; ++x) for (y=0; y<size; ++y) |
| { |
| ip = x + (size * y); |
| |
| /* size is at most 16, so the scaled value below fits in 16 bits |
| */ |
| # define interp(pos, c1, c2) ((pos * c1) + ((size-pos) * c2)) |
| # define xyinterp(x, y, c1, c2, c3, c4) (((size * size / 2) +\ |
| (interp(x, c1, c2) * y + (size-y) * interp(x, c3, c4))) /\ |
| (size*size)) |
| |
| set_color(palette+ip, trans+ip, |
| /* color: green, red,blue,white */ |
| xyinterp(x, y, 0, 255, 0, 255), |
| xyinterp(x, y, 255, 0, 0, 255), |
| xyinterp(x, y, 0, 0, 255, 255), |
| /* alpha: 0, 102, 204, 255) */ |
| xyinterp(x, y, 0, 102, 204, 255), |
| gamma_table); |
| } |
| |
| return ip+1; |
| } |
| } |
| } |
| |
| static void |
| set_value(png_bytep row, size_t rowbytes, png_uint_32 x, unsigned int bit_depth, |
| png_uint_32 value, png_const_bytep gamma_table, double conv) |
| { |
| unsigned int mask = (1U << bit_depth)-1; |
| |
| x *= bit_depth; /* Maximum x is 4*1024, maximum bit_depth is 16 */ |
| |
| if (value <= mask) |
| { |
| png_uint_32 offset = x >> 3; |
| |
| if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes)) |
| { |
| row += offset; |
| |
| switch (bit_depth) |
| { |
| case 1: |
| case 2: |
| case 4: |
| /* Don't gamma correct - values get smashed */ |
| { |
| unsigned int shift = (8 - bit_depth) - (x & 0x7U); |
| |
| mask <<= shift; |
| value = (value << shift) & mask; |
| *row = (png_byte)((*row & ~mask) | value); |
| } |
| return; |
| |
| default: |
| fprintf(stderr, "makepng: bad bit depth (internal error)\n"); |
| exit(1); |
| |
| case 16: |
| value = (unsigned int)floor(65535*pow(value/65535.,conv)+.5); |
| *row++ = (png_byte)(value >> 8); |
| *row = (png_byte)value; |
| return; |
| |
| case 8: |
| *row = gamma_table[value]; |
| return; |
| } |
| } |
| |
| else |
| { |
| fprintf(stderr, "makepng: row buffer overflow (internal error)\n"); |
| exit(1); |
| } |
| } |
| |
| else |
| { |
| fprintf(stderr, "makepng: component overflow (internal error)\n"); |
| exit(1); |
| } |
| } |
| |
| static void |
| generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type, |
| int bit_depth, png_const_bytep gamma_table, double conv, |
| unsigned int *colors) |
| { |
| png_uint_32 size_max = image_size_of_type(color_type, bit_depth, colors)-1; |
| png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */ |
| |
| if (colors[0] == 0) switch (channels_of_type(color_type)) |
| { |
| /* 1 channel: a square image with a diamond, the least luminous colors are on |
| * the edge of the image, the most luminous in the center. |
| */ |
| case 1: |
| { |
| png_uint_32 x; |
| png_uint_32 base = 2*size_max - abs(2*y-size_max); |
| |
| for (x=0; x<=size_max; ++x) |
| { |
| png_uint_32 luma = base - abs(2*x-size_max); |
| |
| /* 'luma' is now in the range 0..2*size_max, we need |
| * 0..depth_max |
| */ |
| luma = (luma*depth_max + size_max) / (2*size_max); |
| set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv); |
| } |
| } |
| break; |
| |
| /* 2 channels: the color channel increases in luminosity from top to bottom, |
| * the alpha channel increases in opacity from left to right. |
| */ |
| case 2: |
| { |
| png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max); |
| png_uint_32 x; |
| |
| for (x=0; x<=size_max; ++x) |
| { |
| set_value(row, rowbytes, 2*x, bit_depth, |
| (depth_max * x * 2 + size_max) / (2 * size_max), gamma_table, |
| conv); |
| set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| conv); |
| } |
| } |
| break; |
| |
| /* 3 channels: linear combinations of, from the top-left corner clockwise, |
| * black, green, white, red. |
| */ |
| case 3: |
| { |
| /* x0: the black->red scale (the value of the red component) at the |
| * start of the row (blue and green are 0). |
| * x1: the green->white scale (the value of the red and blue |
| * components at the end of the row; green is depth_max). |
| */ |
| png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| png_uint_32 x; |
| |
| /* Interpolate x/depth_max from start to end: |
| * |
| * start end difference |
| * red: Y Y 0 |
| * green: 0 depth_max depth_max |
| * blue: 0 Y Y |
| */ |
| for (x=0; x<=size_max; ++x) |
| { |
| set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y, |
| gamma_table, conv); |
| set_value(row, rowbytes, 3*x+1, bit_depth, /* green */ |
| (depth_max * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */ |
| (Y * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| } |
| } |
| break; |
| |
| /* 4 channels: linear combinations of, from the top-left corner clockwise, |
| * transparent, red, green, blue. |
| */ |
| case 4: |
| { |
| /* x0: the transparent->blue scale (the value of the blue and alpha |
| * components) at the start of the row (red and green are 0). |
| * x1: the red->green scale (the value of the red and green |
| * components at the end of the row; blue is 0 and alpha is |
| * depth_max). |
| */ |
| png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| png_uint_32 x; |
| |
| /* Interpolate x/depth_max from start to end: |
| * |
| * start end difference |
| * red: 0 depth_max-Y depth_max-Y |
| * green: 0 Y Y |
| * blue: Y 0 -Y |
| * alpha: Y depth_max depth_max-Y |
| */ |
| for (x=0; x<=size_max; ++x) |
| { |
| set_value(row, rowbytes, 4*x+0, bit_depth, /* red */ |
| ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| set_value(row, rowbytes, 4*x+1, bit_depth, /* green */ |
| (Y * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */ |
| Y - (Y * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */ |
| Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| gamma_table, conv); |
| } |
| } |
| break; |
| |
| default: |
| fprintf(stderr, "makepng: internal bad channel count\n"); |
| exit(2); |
| } |
| |
| else if (color_type & PNG_COLOR_MASK_PALETTE) |
| { |
| /* Palette with fixed color: the image rows are all 0 and the image width |
| * is 16. |
| */ |
| memset(row, rowbytes, 0); |
| } |
| |
| else if (colors[0] == channels_of_type(color_type)) |
| switch (channels_of_type(color_type)) |
| { |
| case 1: |
| { |
| const png_uint_32 luma = colors[1]; |
| png_uint_32 x; |
| |
| for (x=0; x<=size_max; ++x) |
| set_value(row, rowbytes, x, bit_depth, luma, gamma_table, |
| conv); |
| } |
| break; |
| |
| case 2: |
| { |
| const png_uint_32 luma = colors[1]; |
| const png_uint_32 alpha = colors[2]; |
| png_uint_32 x; |
| |
| for (x=0; x<size_max; ++x) |
| { |
| set_value(row, rowbytes, 2*x, bit_depth, luma, gamma_table, |
| conv); |
| set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| conv); |
| } |
| } |
| break; |
| |
| case 3: |
| { |
| const png_uint_32 red = colors[1]; |
| const png_uint_32 green = colors[2]; |
| const png_uint_32 blue = colors[3]; |
| png_uint_32 x; |
| |
| for (x=0; x<=size_max; ++x) |
| { |
| set_value(row, rowbytes, 3*x+0, bit_depth, red, gamma_table, |
| conv); |
| set_value(row, rowbytes, 3*x+1, bit_depth, green, gamma_table, |
| conv); |
| set_value(row, rowbytes, 3*x+2, bit_depth, blue, gamma_table, |
| conv); |
| } |
| } |
| break; |
| |
| case 4: |
| { |
| const png_uint_32 red = colors[1]; |
| const png_uint_32 green = colors[2]; |
| const png_uint_32 blue = colors[3]; |
| const png_uint_32 alpha = colors[4]; |
| png_uint_32 x; |
| |
| for (x=0; x<=size_max; ++x) |
| { |
| set_value(row, rowbytes, 4*x+0, bit_depth, red, gamma_table, |
| conv); |
| set_value(row, rowbytes, 4*x+1, bit_depth, green, gamma_table, |
| conv); |
| set_value(row, rowbytes, 4*x+2, bit_depth, blue, gamma_table, |
| conv); |
| set_value(row, rowbytes, 4*x+3, bit_depth, alpha, gamma_table, |
| conv); |
| } |
| } |
| break; |
| |
| default: |
| fprintf(stderr, "makepng: internal bad channel count\n"); |
| exit(2); |
| } |
| |
| else |
| { |
| fprintf(stderr, |
| "makepng: --color: count(%u) does not match channels(%u)\n", |
| colors[0], channels_of_type(color_type)); |
| exit(1); |
| } |
| } |
| |
| |
| static void PNGCBAPI |
| makepng_warning(png_structp png_ptr, png_const_charp message) |
| { |
| const char **ep = png_get_error_ptr(png_ptr); |
| const char *name; |
| |
| if (ep != NULL && *ep != NULL) |
| name = *ep; |
| |
| else |
| name = "makepng"; |
| |
| fprintf(stderr, "%s: warning: %s\n", name, message); |
| } |
| |
| static void PNGCBAPI |
| makepng_error(png_structp png_ptr, png_const_charp message) |
| { |
| makepng_warning(png_ptr, message); |
| png_longjmp(png_ptr, 1); |
| } |
| |
| static int /* 0 on success, else an error code */ |
| write_png(const char **name, FILE *fp, int color_type, int bit_depth, |
| volatile png_fixed_point gamma, chunk_insert * volatile insert, |
| unsigned int filters, unsigned int *colors) |
| { |
| png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, |
| name, makepng_error, makepng_warning); |
| volatile png_infop info_ptr = NULL; |
| volatile png_bytep row = NULL; |
| |
| if (png_ptr == NULL) |
| { |
| fprintf(stderr, "makepng: OOM allocating write structure\n"); |
| return 1; |
| } |
| |
| if (setjmp(png_jmpbuf(png_ptr))) |
| { |
| png_structp nv_ptr = png_ptr; |
| png_infop nv_info = info_ptr; |
| |
| png_ptr = NULL; |
| info_ptr = NULL; |
| png_destroy_write_struct(&nv_ptr, &nv_info); |
| if (row != NULL) free(row); |
| return 1; |
| } |
| |
| /* Allow benign errors so that we can write PNGs with errors */ |
| png_set_benign_errors(png_ptr, 1/*allowed*/); |
| png_init_io(png_ptr, fp); |
| |
| info_ptr = png_create_info_struct(png_ptr); |
| if (info_ptr == NULL) |
| png_error(png_ptr, "OOM allocating info structure"); |
| |
| { |
| unsigned int size = image_size_of_type(color_type, bit_depth, colors); |
| png_fixed_point real_gamma = 45455; /* For sRGB */ |
| png_byte gamma_table[256]; |
| double conv; |
| |
| /* This function uses the libpng values used on read to carry extra |
| * information about the gamma: |
| */ |
| if (gamma == PNG_GAMMA_MAC_18) |
| gamma = 65909; |
| |
| else if (gamma > 0 && gamma < 1000) |
| gamma = PNG_FP_1; |
| |
| if (gamma > 0) |
| real_gamma = gamma; |
| |
| { |
| unsigned int i; |
| |
| if (real_gamma == 45455) for (i=0; i<256; ++i) |
| { |
| gamma_table[i] = (png_byte)i; |
| conv = 1.; |
| } |
| |
| else |
| { |
| /* Convert 'i' from sRGB (45455) to real_gamma, this makes |
| * the images look the same regardless of the gAMA chunk. |
| */ |
| conv = real_gamma; |
| conv /= 45455; |
| |
| gamma_table[0] = 0; |
| |
| for (i=0; i<255; ++i) |
| gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + 127.5); |
| |
| gamma_table[255] = 255; |
| } |
| } |
| |
| png_set_IHDR(png_ptr, info_ptr, size, size, bit_depth, color_type, |
| PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| |
| if (color_type & PNG_COLOR_MASK_PALETTE) |
| { |
| int npalette; |
| png_color palette[256]; |
| png_byte trans[256]; |
| |
| npalette = generate_palette(palette, trans, bit_depth, gamma_table, |
| colors); |
| png_set_PLTE(png_ptr, info_ptr, palette, npalette); |
| png_set_tRNS(png_ptr, info_ptr, trans, npalette-1, |
| NULL/*transparent color*/); |
| |
| /* Reset gamma_table to prevent the image rows being changed */ |
| for (npalette=0; npalette<256; ++npalette) |
| gamma_table[npalette] = (png_byte)npalette; |
| } |
| |
| if (gamma == PNG_DEFAULT_sRGB) |
| png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE); |
| |
| else if (gamma > 0) /* Else don't set color space information */ |
| { |
| png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma); |
| |
| /* Just use the sRGB values here. */ |
| png_set_cHRM_fixed(png_ptr, info_ptr, |
| /* color x y */ |
| /* white */ 31270, 32900, |
| /* red */ 64000, 33000, |
| /* green */ 30000, 60000, |
| /* blue */ 15000, 6000 |
| ); |
| } |
| |
| /* Insert extra information. */ |
| while (insert != NULL) |
| { |
| insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters); |
| insert = insert->next; |
| } |
| |
| /* Write the file header. */ |
| png_write_info(png_ptr, info_ptr); |
| |
| /* Restrict the filters */ |
| png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters); |
| |
| { |
| int passes = png_set_interlace_handling(png_ptr); |
| int pass; |
| png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); |
| |
| row = malloc(rowbytes); |
| |
| if (row == NULL) |
| png_error(png_ptr, "OOM allocating row buffer"); |
| |
| for (pass = 0; pass < passes; ++pass) |
| { |
| unsigned int y; |
| |
| for (y=0; y<size; ++y) |
| { |
| generate_row(row, rowbytes, y, color_type, bit_depth, |
| gamma_table, conv, colors); |
| png_write_row(png_ptr, row); |
| } |
| } |
| } |
| } |
| |
| /* Finish writing the file. */ |
| png_write_end(png_ptr, info_ptr); |
| |
| { |
| png_structp nv_ptr = png_ptr; |
| png_infop nv_info = info_ptr; |
| |
| png_ptr = NULL; |
| info_ptr = NULL; |
| png_destroy_write_struct(&nv_ptr, &nv_info); |
| } |
| free(row); |
| return 0; |
| } |
| |
| |
| static size_t |
| load_file(png_const_charp name, png_bytepp result) |
| { |
| FILE *fp = tmpfile(); |
| |
| if (fp != NULL) |
| { |
| FILE *ip = fopen(name, "rb"); |
| |
| if (ip != NULL) |
| { |
| size_t total = 0; |
| int ch; |
| |
| for (;;) |
| { |
| ch = getc(ip); |
| if (ch == EOF) break; |
| putc(ch, fp); |
| ++total; |
| } |
| |
| if (ferror(ip)) |
| { |
| perror(name); |
| fprintf(stderr, "%s: read error\n", name); |
| (void)fclose(ip); |
| } |
| |
| else |
| { |
| (void)fclose(ip); |
| |
| if (ferror(fp)) |
| { |
| perror("temporary file"); |
| fprintf(stderr, "temporary file write error\n"); |
| } |
| |
| else |
| { |
| rewind(fp); |
| |
| if (total > 0) |
| { |
| /* Round up to a multiple of 4 here to allow an iCCP profile |
| * to be padded to a 4x boundary. |
| */ |
| png_bytep data = malloc((total+3)&~3); |
| |
| if (data != NULL) |
| { |
| size_t new_size = 0; |
| |
| for (;;) |
| { |
| ch = getc(fp); |
| if (ch == EOF) break; |
| data[new_size++] = (png_byte)ch; |
| } |
| |
| if (ferror(fp) || new_size != total) |
| { |
| perror("temporary file"); |
| fprintf(stderr, "temporary file read error\n"); |
| free(data); |
| } |
| |
| else |
| { |
| (void)fclose(fp); |
| *result = data; |
| return total; |
| } |
| } |
| |
| else |
| fprintf(stderr, "%s: out of memory loading file\n", name); |
| } |
| |
| else |
| fprintf(stderr, "%s: empty file\n", name); |
| } |
| } |
| } |
| |
| else |
| { |
| perror(name); |
| fprintf(stderr, "%s: open failed\n", name); |
| } |
| |
| fclose(fp); |
| } |
| |
| else |
| fprintf(stderr, "makepng: %s: could not open temporary file\n", name); |
| |
| exit(1); |
| return 0; |
| } |
| |
| static png_size_t |
| load_fake(png_charp param, png_bytepp profile) |
| { |
| char *endptr = NULL; |
| unsigned long long int size = strtoull(param, &endptr, 0/*base*/); |
| |
| /* The 'fake' format is <number>*[string] */ |
| if (endptr != NULL && *endptr == '*') |
| { |
| size_t len = strlen(++endptr); |
| size_t result = (size_t)size; |
| |
| if (len == 0) len = 1; /* capture the terminating '\0' */ |
| |
| /* Now repeat that string to fill 'size' bytes. */ |
| if (result == size && (*profile = malloc(result)) != NULL) |
| { |
| png_bytep out = *profile; |
| |
| if (len == 1) |
| memset(out, *endptr, result); |
| |
| else |
| { |
| while (size >= len) |
| { |
| memcpy(out, endptr, len); |
| out += len; |
| size -= len; |
| } |
| memcpy(out, endptr, size); |
| } |
| |
| return result; |
| } |
| |
| else |
| { |
| fprintf(stderr, "%s: size exceeds system limits\n", param); |
| exit(1); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void |
| check_param_count(int nparams, int expect) |
| { |
| if (nparams != expect) |
| { |
| fprintf(stderr, "bad parameter count (internal error)\n"); |
| exit(1); |
| } |
| } |
| |
| static void |
| insert_iCCP(png_structp png_ptr, png_infop info_ptr, int nparams, |
| png_charpp params) |
| { |
| png_bytep profile = NULL; |
| png_uint_32 proflen = 0; |
| int result; |
| |
| check_param_count(nparams, 2); |
| |
| switch (params[1][0]) |
| { |
| case '<': |
| { |
| png_size_t filelen = load_file(params[1]+1, &profile); |
| if (filelen > 0xfffffffc) /* Maximum profile length */ |
| { |
| fprintf(stderr, "%s: file too long (%lu) for an ICC profile\n", |
| params[1]+1, (unsigned long)filelen); |
| exit(1); |
| } |
| |
| proflen = (png_uint_32)filelen; |
| } |
| break; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| { |
| png_size_t fake_len = load_fake(params[1], &profile); |
| |
| if (fake_len > 0) /* else a simple parameter */ |
| { |
| if (fake_len > 0xffffffff) /* Maximum profile length */ |
| { |
| fprintf(stderr, |
| "%s: fake data too long (%lu) for an ICC profile\n", |
| params[1], (unsigned long)fake_len); |
| exit(1); |
| } |
| proflen = (png_uint_32)(fake_len & ~3U); |
| /* Always fix up the profile length. */ |
| png_save_uint_32(profile, proflen); |
| break; |
| } |
| } |
| |
| default: |
| fprintf(stderr, "--insert iCCP \"%s\": unrecognized\n", params[1]); |
| fprintf(stderr, " use '<' to read a file: \"<filename\"\n"); |
| exit(1); |
| } |
| |
| result = 1; |
| |
| if (proflen & 3) |
| { |
| fprintf(stderr, |
| "makepng: --insert iCCP %s: profile length made a multiple of 4\n", |
| params[1]); |
| |
| /* load_file allocates extra space for this padding, the ICC spec requires |
| * padding with zero bytes. |
| */ |
| while (proflen & 3) |
| profile[proflen++] = 0; |
| } |
| |
| if (profile != NULL && proflen > 3) |
| { |
| png_uint_32 prof_header = png_get_uint_32(profile); |
| |
| if (prof_header != proflen) |
| { |
| fprintf(stderr, "--insert iCCP %s: profile length field wrong:\n", |
| params[1]); |
| fprintf(stderr, " actual %lu, recorded value %lu (corrected)\n", |
| (unsigned long)proflen, (unsigned long)prof_header); |
| png_save_uint_32(profile, proflen); |
| } |
| } |
| |
| if (result && profile != NULL && proflen >=4) |
| png_set_iCCP(png_ptr, info_ptr, params[0], PNG_COMPRESSION_TYPE_BASE, |
| profile, proflen); |
| |
| if (profile) |
| free(profile); |
| |
| if (!result) |
| exit(1); |
| } |
| |
| static void |
| clear_text(png_text *text, png_charp keyword) |
| { |
| text->compression = -1; /* none */ |
| text->key = keyword; |
| text->text = NULL; |
| text->text_length = 0; /* libpng calculates this */ |
| text->itxt_length = 0; /* libpng calculates this */ |
| text->lang = NULL; |
| text->lang_key = NULL; |
| } |
| |
| static void |
| set_text(png_structp png_ptr, png_infop info_ptr, png_textp text, |
| png_charp param) |
| { |
| switch (param[0]) |
| { |
| case '<': |
| { |
| png_bytep file = NULL; |
| |
| text->text_length = load_file(param+1, &file); |
| text->text = (png_charp)file; |
| } |
| break; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| { |
| png_bytep data = NULL; |
| png_size_t fake_len = load_fake(param, &data); |
| |
| if (fake_len > 0) /* else a simple parameter */ |
| { |
| text->text_length = fake_len; |
| text->text = (png_charp)data; |
| break; |
| } |
| } |
| |
| default: |
| text->text = param; |
| break; |
| } |
| |
| png_set_text(png_ptr, info_ptr, text, 1); |
| |
| if (text->text != param) |
| free(text->text); |
| } |
| |
| static void |
| insert_tEXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| png_charpp params) |
| { |
| png_text text; |
| |
| check_param_count(nparams, 2); |
| clear_text(&text, params[0]); |
| set_text(png_ptr, info_ptr, &text, params[1]); |
| } |
| |
| static void |
| insert_zTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| png_charpp params) |
| { |
| png_text text; |
| |
| check_param_count(nparams, 2); |
| clear_text(&text, params[0]); |
| text.compression = 0; /* deflate */ |
| set_text(png_ptr, info_ptr, &text, params[1]); |
| } |
| |
| static void |
| insert_iTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| png_charpp params) |
| { |
| png_text text; |
| |
| check_param_count(nparams, 4); |
| clear_text(&text, params[0]); |
| text.compression = 2; /* iTXt + deflate */ |
| text.lang = params[1];/* language tag */ |
| text.lang_key = params[2]; /* translated keyword */ |
| set_text(png_ptr, info_ptr, &text, params[3]); |
| } |
| |
| static void |
| insert_hIST(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) |
| { |
| int i; |
| png_uint_16 freq[256]; |
| |
| /* libpng takes the count from the PLTE count; we don't check it here but we |
| * do set the array to 0 for unspecified entries. |
| */ |
| memset(freq, 0, sizeof freq); |
| for (i=0; i<nparams; ++i) |
| { |
| char *endptr = NULL; |
| unsigned long int l = strtoul(params[i], &endptr, 0/*base*/); |
| |
| if (params[i][0] && *endptr == 0 && l <= 65535) |
| freq[i] = (png_uint_16)l; |
| |
| else |
| { |
| fprintf(stderr, "hIST[%d]: %s: invalid frequency\n", i, params[i]); |
| exit(1); |
| } |
| } |
| |
| png_set_hIST(png_ptr, info_ptr, freq); |
| } |
| |
| #if 0 |
| static void |
| insert_sPLT(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) |
| { |
| fprintf(stderr, "insert sPLT: NYI\n"); |
| } |
| #endif |
| |
| static int |
| find_parameters(png_const_charp what, png_charp param, png_charp *list, |
| int nparams) |
| { |
| /* Parameters are separated by '\n' or ':' characters, up to nparams are |
| * accepted (more is an error) and the number found is returned. |
| */ |
| int i; |
| for (i=0; *param && i<nparams; ++i) |
| { |
| list[i] = param; |
| while (*++param) if (*param == '\n' || *param == ':') |
| { |
| *param++ = 0; /* Terminate last parameter */ |
| break; /* And start a new one. */ |
| } |
| } |
| |
| if (*param) |
| { |
| fprintf(stderr, "--insert %s: too many parameters (%s)\n", what, param); |
| exit(1); |
| } |
| |
| list[i] = NULL; /* terminates list */ |
| return i; /* number of parameters filled in */ |
| } |
| |
| static void |
| bad_parameter_count(png_const_charp what, int nparams) |
| { |
| fprintf(stderr, "--insert %s: bad parameter count %d\n", what, nparams); |
| exit(1); |
| } |
| |
| static chunk_insert * |
| make_insert(png_const_charp what, |
| void (*insert)(png_structp, png_infop, int, png_charpp), |
| int nparams, png_charpp list) |
| { |
| int i; |
| chunk_insert *cip; |
| |
| cip = malloc(offsetof(chunk_insert,parameters) + |
| nparams * sizeof (png_charp)); |
| |
| if (cip == NULL) |
| { |
| fprintf(stderr, "--insert %s: out of memory allocating %d parameters\n", |
| what, nparams); |
| exit(1); |
| } |
| |
| cip->next = NULL; |
| cip->insert = insert; |
| cip->nparams = nparams; |
| for (i=0; i<nparams; ++i) |
| cip->parameters[i] = list[i]; |
| |
| return cip; |
| } |
| |
| static chunk_insert * |
| find_insert(png_const_charp what, png_charp param) |
| { |
| png_uint_32 chunk = 0; |
| png_charp parameter_list[1024]; |
| int i, nparams; |
| |
| /* Assemble the chunk name */ |
| for (i=0; i<4; ++i) |
| { |
| char ch = what[i]; |
| |
| if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)) |
| chunk = (chunk << 8) + what[i]; |
| |
| else |
| break; |
| } |
| |
| if (i < 4 || what[4] != 0) |
| { |
| fprintf(stderr, "makepng --insert \"%s\": invalid chunk name\n", what); |
| exit(1); |
| } |
| |
| /* Assemble the parameter list. */ |
| nparams = find_parameters(what, param, parameter_list, 1024); |
| |
| # define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d)) |
| |
| switch (chunk) |
| { |
| case CHUNK(105,67,67,80): /* iCCP */ |
| if (nparams == 2) |
| return make_insert(what, insert_iCCP, nparams, parameter_list); |
| break; |
| |
| case CHUNK(116,69,88,116): /* tEXt */ |
| if (nparams == 2) |
| return make_insert(what, insert_tEXt, nparams, parameter_list); |
| break; |
| |
| case CHUNK(122,84,88,116): /* zTXt */ |
| if (nparams == 2) |
| return make_insert(what, insert_zTXt, nparams, parameter_list); |
| break; |
| |
| case CHUNK(105,84,88,116): /* iTXt */ |
| if (nparams == 4) |
| return make_insert(what, insert_iTXt, nparams, parameter_list); |
| break; |
| |
| case CHUNK(104,73,83,84): /* hIST */ |
| if (nparams <= 256) |
| return make_insert(what, insert_hIST, nparams, parameter_list); |
| break; |
| |
| #if 0 |
| case CHUNK(115,80,76,84): /* sPLT */ |
| return make_insert(what, insert_sPLT, nparams, parameter_list); |
| #endif |
| |
| default: |
| fprintf(stderr, "makepng --insert \"%s\": unrecognized chunk name\n", |
| what); |
| exit(1); |
| } |
| |
| bad_parameter_count(what, nparams); |
| return NULL; |
| } |
| |
| /* This is a not-very-good parser for a sequence of numbers (including 0). It |
| * doesn't accept some apparently valid things, but it accepts all the sensible |
| * combinations. |
| */ |
| static void |
| parse_color(char *arg, unsigned int *colors) |
| { |
| unsigned int ncolors = 0; |
| |
| while (*arg && ncolors < 4) |
| { |
| char *ep = arg; |
| |
| unsigned long ul = strtoul(arg, &ep, 0); |
| |
| if (ul > 65535) |
| { |
| fprintf(stderr, "makepng --color=...'%s': too big\n", arg); |
| exit(1); |
| } |
| |
| if (ep == arg) |
| { |
| fprintf(stderr, "makepng --color=...'%s': not a valid color\n", arg); |
| exit(1); |
| } |
| |
| if (*ep) ++ep; /* skip a separator */ |
| arg = ep; |
| |
| colors[++ncolors] = (unsigned int)ul; /* checked above */ |
| } |
| |
| if (*arg) |
| { |
| fprintf(stderr, "makepng --color=...'%s': too many values\n", arg); |
| exit(1); |
| } |
| |
| *colors = ncolors; |
| } |
| |
| int |
| main(int argc, char **argv) |
| { |
| FILE *fp = stdout; |
| const char *file_name = NULL; |
| int color_type = 8; /* invalid */ |
| int bit_depth = 32; /* invalid */ |
| unsigned int colors[5]; |
| unsigned int filters = PNG_ALL_FILTERS; |
| png_fixed_point gamma = 0; /* not set */ |
| chunk_insert *head_insert = NULL; |
| chunk_insert **insert_ptr = &head_insert; |
| |
| memset(colors, 0, sizeof colors); |
| |
| while (--argc > 0) |
| { |
| char *arg = *++argv; |
| |
| if (strcmp(arg, "--sRGB") == 0) |
| { |
| gamma = PNG_DEFAULT_sRGB; |
| continue; |
| } |
| |
| if (strcmp(arg, "--linear") == 0) |
| { |
| gamma = PNG_FP_1; |
| continue; |
| } |
| |
| if (strcmp(arg, "--1.8") == 0) |
| { |
| gamma = PNG_GAMMA_MAC_18; |
| continue; |
| } |
| |
| if (strcmp(arg, "--nofilters") == 0) |
| { |
| filters = PNG_FILTER_NONE; |
| continue; |
| } |
| |
| if (strncmp(arg, "--color=", 8) == 0) |
| { |
| parse_color(arg+8, colors); |
| continue; |
| } |
| |
| if (argc >= 3 && strcmp(arg, "--insert") == 0) |
| { |
| png_const_charp what = *++argv; |
| png_charp param = *++argv; |
| chunk_insert *new_insert; |
| |
| argc -= 2; |
| |
| new_insert = find_insert(what, param); |
| |
| if (new_insert != NULL) |
| { |
| *insert_ptr = new_insert; |
| insert_ptr = &new_insert->next; |
| } |
| |
| continue; |
| } |
| |
| if (arg[0] == '-') |
| { |
| fprintf(stderr, "makepng: %s: invalid option\n", arg); |
| exit(1); |
| } |
| |
| if (strcmp(arg, "palette") == 0) |
| { |
| color_type = PNG_COLOR_TYPE_PALETTE; |
| continue; |
| } |
| |
| if (strncmp(arg, "gray", 4) == 0) |
| { |
| if (arg[4] == 0) |
| { |
| color_type = PNG_COLOR_TYPE_GRAY; |
| continue; |
| } |
| |
| else if (strcmp(arg+4, "a") == 0 || |
| strcmp(arg+4, "alpha") == 0 || |
| strcmp(arg+4, "-alpha") == 0) |
| { |
| color_type = PNG_COLOR_TYPE_GRAY_ALPHA; |
| continue; |
| } |
| } |
| |
| if (strncmp(arg, "rgb", 3) == 0) |
| { |
| if (arg[3] == 0) |
| { |
| color_type = PNG_COLOR_TYPE_RGB; |
| continue; |
| } |
| |
| else if (strcmp(arg+3, "a") == 0 || |
| strcmp(arg+3, "alpha") == 0 || |
| strcmp(arg+3, "-alpha") == 0) |
| { |
| color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| continue; |
| } |
| } |
| |
| if (color_type == 8 && isdigit(arg[0])) |
| { |
| color_type = atoi(arg); |
| if (color_type < 0 || color_type > 6 || color_type == 1 || |
| color_type == 5) |
| { |
| fprintf(stderr, "makepng: %s: not a valid color type\n", arg); |
| exit(1); |
| } |
| |
| continue; |
| } |
| |
| if (bit_depth == 32 && isdigit(arg[0])) |
| { |
| bit_depth = atoi(arg); |
| if (bit_depth <= 0 || bit_depth > 16 || |
| (bit_depth & -bit_depth) != bit_depth) |
| { |
| fprintf(stderr, "makepng: %s: not a valid bit depth\n", arg); |
| exit(1); |
| } |
| |
| continue; |
| } |
| |
| if (argc == 1) /* It's the file name */ |
| { |
| fp = fopen(arg, "wb"); |
| if (fp == NULL) |
| { |
| fprintf(stderr, "%s: %s: could not open\n", arg, strerror(errno)); |
| exit(1); |
| } |
| |
| file_name = arg; |
| continue; |
| } |
| |
| fprintf(stderr, "makepng: %s: unknown argument\n", arg); |
| exit(1); |
| } /* argument while loop */ |
| |
| if (color_type == 8 || bit_depth == 32) |
| { |
| fprintf(stderr, "usage: makepng [--sRGB|--linear|--1.8] " |
| "[--color=...] color-type bit-depth [file-name]\n" |
| " Make a test PNG file, by default writes to stdout.\n"); |
| exit(1); |
| } |
| |
| /* Check the colors */ |
| { |
| const unsigned int lim = (color_type == PNG_COLOR_TYPE_PALETTE ? 255U : |
| (1U<<bit_depth)-1); |
| unsigned int i; |
| |
| for (i=1; i<=colors[0]; ++i) |
| if (colors[i] > lim) |
| { |
| fprintf(stderr, "makepng: --color=...: %u out of range [0..%u]\n", |
| colors[i], lim); |
| exit(1); |
| } |
| } |
| |
| /* Restrict the filters for more speed to those we know are used for the |
| * generated images. |
| */ |
| if (filters == PNG_ALL_FILTERS) |
| { |
| if ((color_type & PNG_COLOR_MASK_PALETTE) != 0 || bit_depth < 8) |
| filters = PNG_FILTER_NONE; |
| |
| else if (color_type & PNG_COLOR_MASK_COLOR) /* rgb */ |
| { |
| if (bit_depth == 8) |
| filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG); |
| |
| else |
| filters = PNG_FILTER_SUB | PNG_FILTER_PAETH; |
| } |
| |
| else /* gray 8 or 16-bit */ |
| filters &= ~PNG_FILTER_NONE; |
| } |
| |
| { |
| int ret = write_png(&file_name, fp, color_type, bit_depth, gamma, |
| head_insert, filters, colors); |
| |
| if (ret != 0 && file_name != NULL) |
| remove(file_name); |
| |
| return ret; |
| } |
| } |
