/*
* 2ooM: The Master of Orion II Reverse Engineering Project
* Netpbm output routines for lbximg extration.
* Copyright © 2013 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include "image.h"
#include "tools.h"
#include "imgoutput.h"
/* Convert c from the basic execution character set to ASCII. */
static unsigned char to_ascii(unsigned char c)
{
switch (c) {
case'\a': return 0x07;
case'\b': return 0x08;
case'\t': return 0x09;
case'\n': return 0x0a;
case'\v': return 0x0b;
case'\f': return 0x0c;
case'\r': return 0x0d;
case ' ': return 0x20;
case '!': return 0x21;
case '"': return 0x22;
case '#': return 0x23;
case '%': return 0x25;
case '&': return 0x26;
case'\'': return 0x27;
case '(': return 0x28;
case ')': return 0x29;
case '*': return 0x2a;
case '+': return 0x2b;
case ',': return 0x2c;
case '-': return 0x2d;
case '.': return 0x2e;
case '/': return 0x2f;
case '0': return 0x30;
case '1': return 0x31;
case '2': return 0x32;
case '3': return 0x33;
case '4': return 0x34;
case '5': return 0x35;
case '6': return 0x36;
case '7': return 0x37;
case '8': return 0x38;
case '9': return 0x39;
case ':': return 0x3a;
case ';': return 0x3b;
case '<': return 0x3c;
case '=': return 0x3d;
case '>': return 0x3e;
case '?': return 0x3f;
case 'A': return 0x41;
case 'B': return 0x42;
case 'C': return 0x43;
case 'D': return 0x44;
case 'E': return 0x45;
case 'F': return 0x46;
case 'G': return 0x47;
case 'H': return 0x48;
case 'I': return 0x49;
case 'J': return 0x4a;
case 'K': return 0x4b;
case 'L': return 0x4c;
case 'M': return 0x4d;
case 'N': return 0x4e;
case 'O': return 0x4f;
case 'P': return 0x50;
case 'Q': return 0x51;
case 'R': return 0x52;
case 'S': return 0x53;
case 'T': return 0x54;
case 'U': return 0x55;
case 'V': return 0x56;
case 'W': return 0x57;
case 'X': return 0x58;
case 'Y': return 0x59;
case 'Z': return 0x5a;
case '[': return 0x5b;
case'\\': return 0x5c;
case ']': return 0x5d;
case '^': return 0x5e;
case '_': return 0x5f;
case 'a': return 0x61;
case 'b': return 0x62;
case 'c': return 0x63;
case 'd': return 0x64;
case 'e': return 0x65;
case 'f': return 0x66;
case 'g': return 0x67;
case 'h': return 0x68;
case 'i': return 0x69;
case 'j': return 0x6a;
case 'k': return 0x6b;
case 'l': return 0x6c;
case 'm': return 0x6d;
case 'n': return 0x6e;
case 'o': return 0x6f;
case 'p': return 0x70;
case 'q': return 0x71;
case 'r': return 0x72;
case 's': return 0x73;
case 't': return 0x74;
case 'u': return 0x75;
case 'v': return 0x76;
case 'w': return 0x77;
case 'x': return 0x78;
case 'y': return 0x79;
case 'z': return 0x7a;
case '{': return 0x7b;
case '|': return 0x7c;
case '}': return 0x7d;
case '~': return 0x7e;
default: assert((tool_err(-1, "invalid codepoint: %hhx", c), 0));
}
return c;
}
/* Printf variant which converts all output to ASCII. */
static int fprintf_ascii(FILE *f, char *fmt, ...)
{
unsigned char *buf;
va_list ap;
int rc, len;
size_t ret;
va_start(ap, fmt);
rc = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (rc < 0)
return -1;
assert(rc < SIZE_MAX);
buf = malloc(rc+1u);
if (!buf)
return -1;
va_start(ap, fmt);
len = vsprintf((char *)buf, fmt, ap);
va_end(ap);
assert(rc == len);
for (int i = 0; i < len; i++) {
buf[i] = to_ascii(buf[i]);
}
ret = fwrite(buf, 1, len, f);
free(buf);
if (ret < len)
return -(int)ret;
return ret;
}
/*
* Output filter for Netpbm's "plain" PBM format. This is a bitmap format
* which is not really suitable for image data, but it can output the image
* transparency mask, and thus complements the PPM output. The image colour
* data is lost in the conversion.
*/
int img_output_pbm(FILE *f, const char *filename,
unsigned width, unsigned height,
unsigned char **framedata, unsigned char **mask,
struct lbx_colour *palette)
{
unsigned x, y;
if (fprintf_ascii(f, "P1\n%u %u", width, height) < 0)
goto err;
for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
if (fputc(to_ascii(x > 0 ? ' ' : '\n'), f) == EOF)
goto err;
if (mask[y][x]) {
if (fputc(to_ascii('0'), f) == EOF)
goto err;
} else {
if (fputc(to_ascii('1'), f) == EOF)
goto err;
}
}
if (fputc(to_ascii('\n'), f) == EOF)
goto err;
return 0;
err:
tool_err(0, "error writing %s", filename);
return -1;
}
/*
* Helper for Netpbm's "plain" PGM output. This is only meant for no-palette
* mode as normally LBX images are not grayscale, so it is not available as a
* normal output format.
*/
static int write_pgm(FILE *f, unsigned width, unsigned height,
unsigned char **framedata, unsigned char **mask)
{
unsigned x, y;
if (fprintf_ascii(f, "P2\n%u %u\n255", width, height) < 0)
return -1;
for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
if (fputc(to_ascii(x > 0 ? ' ' : '\n'), f) == EOF)
return -1;
if (!mask[y][x]) {
if (fprintf_ascii(f, " 0") < 0)
return -1;
} else {
if (fprintf_ascii(f, "%3hhu", framedata[y][x]) < 0)
return -1;
}
}
if (fputc(to_ascii('\n'), f) == EOF)
return -1;
return 0;
}
/*
* Output filter for Netpbm's "plain" PPM format. This supports RGB but not
* transparency. As a pure text format, it is useful for testing but is not
* particularly efficient in terms of storage. The image mask is lost in
* the conversion (output pixels will be black).
*/
int img_output_ppm(FILE *f, const char *filename,
unsigned width, unsigned height,
unsigned char **framedata, unsigned char **mask,
struct lbx_colour *palette)
{
unsigned x, y;
if (!palette) {
/*
* For no-palette mode, write a PGM instead which is basically
* the same format but has only one value per pixel.
*/
if (write_pgm(f, width, height, framedata, mask) < 0)
goto err;
return 0;
}
if (fprintf_ascii(f, "P3\n%u %u\n63", width, height) < 0)
goto err;
for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
if (fputc(to_ascii(x > 0 ? ' ' : '\n'), f) == EOF)
goto err;
if (!mask[y][x]) {
if (fprintf_ascii(f, " 0 0 0") < 0)
goto err;
} else {
struct lbx_colour *c = &palette[framedata[y][x]];
if (fprintf_ascii(f, "%2d %2d %2d",
c->red, c->green, c->blue) < 0)
goto err;
}
}
if (fputc(to_ascii('\n'), f) == EOF)
goto err;
return 0;
err:
tool_err(0, "error writing %s", filename);
return -1;
}
/*
* Output filter for Netpbm's PAM format. This format combines the features
* of all the other Netpbm formats, supporting RGB and grayscale images with
* or without alpha channels. This format supports all lbximg output.
*/
int img_output_pam(FILE *f, const char *filename,
unsigned width, unsigned height,
unsigned char **framedata, unsigned char **mask,
struct lbx_colour *palette)
{
bool masked = img_is_masked(mask, width, height);
unsigned x, y;
size_t depth;
if (fprintf_ascii(f, "P7\nWIDTH %u\nHEIGHT %u\n", width, height) < 0)
goto err;
if (palette) {
depth = masked ? 4 : 3;
if (fprintf_ascii(f, "DEPTH %zu\nMAXVAL 63\n"
"TUPLTYPE RGB%s\nENDHDR\n",
depth, masked ? "_ALPHA" : "") < 0)
goto err;
for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
struct lbx_colour *c = &palette[framedata[y][x]];
unsigned char buf[4];
buf[0] = c->red;
buf[1] = c->green;
buf[2] = c->blue;
buf[3] = mask[y][x] ? 63 : 0;
if (fwrite(buf, 1, depth, f) < depth)
goto err;
}
} else {
depth = masked ? 2 : 1;
if (fprintf_ascii(f, "DEPTH %zu\nMAXVAL 255\n"
"TUPLTYPE GRAYSCALE%s\nENDHDR\n",
depth, masked ? "_ALPHA" : "") < 0)
goto err;
for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
unsigned char buf[2];
buf[0] = framedata[y][x];
buf[1] = mask[y][x] ? 0xff : 0;
if (fwrite(buf, 1, depth, f) < depth)
goto err;
}
}
return 0;
err:
tool_err(0, "error writing %s", filename);
return -1;
}