/*
* 2ooM: The Master of Orion II Reverse Engineering Project
* Simple command-line tool to convert an LBX image to other formats.
- * Copyright © 2006-2011, 2013 Nick Bowler
+ * Copyright © 2006-2011, 2013-2014 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
#include <stdbool.h>
#include <string.h>
#include <limits.h>
+#include <stdint.h>
#include <assert.h>
#include <getopt.h>
#include <errno.h>
#include "imgoutput.h"
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
/* Global flags */
static int verbose = 0;
static char *outname = "out";
return -1;
}
-bool img_is_masked(unsigned char **mask, unsigned width, unsigned height)
+bool img_is_masked(unsigned char *mask, unsigned width, unsigned height)
{
- unsigned x, y;
-
- for (x = y = 0; y < height; ++x < width || (x = 0, y++)) {
- if (mask[y][x] == 0)
- return true;
+ unsigned long npixels = (unsigned long) width * height;
+ unsigned long mask_sz = npixels / CHAR_BIT + (npixels % CHAR_BIT != 0);
+
+ for (unsigned long i = 0; i < mask_sz; i++) {
+ if (i+1 < mask_sz) {
+ if (mask[i] != (unsigned char)-1)
+ return true;
+ } else {
+ unsigned char test = (1u << npixels % CHAR_BIT) - 1;
+
+ if ((mask[i] & test) != test)
+ return true;
+ }
}
return false;
}
int output(unsigned int frameno, const struct img_format *fmt,
- unsigned char **framedata, unsigned char **mask,
+ unsigned char *pixels, unsigned char *pixel_mask,
unsigned int width, unsigned int height,
struct lbx_colour palette[static 256])
{
return -1;
}
- rc = fmt->output(of, name, width, height, framedata, mask, palette);
+ rc = fmt->output(of, name, width, height, pixels, pixel_mask, palette);
if (rc < 0) {
fclose(of);
return -1;
tool_err(0, "error writing %s", name);
return -1;
}
-
+
if (verbose)
printf("wrote %s\n", name);
return 0;
}
+/* Return true iff a divides b. */
+static bool divides(unsigned a, unsigned b)
+{
+ if (b == 0)
+ return true;
+ if (a == 0)
+ return false;
+
+ return b % a == 0;
+}
+
+/* Set n bits starting from offset in the bitmap. */
+static void
+set_bits(unsigned char *bitmap, unsigned long offset, unsigned long n)
+{
+ if (offset % CHAR_BIT) {
+ bitmap[offset/CHAR_BIT] |= (n >= CHAR_BIT ? -1u : (1u << n) - 1)
+ << offset%CHAR_BIT;
+
+ n -= MIN(n, CHAR_BIT - offset%CHAR_BIT);
+ offset += CHAR_BIT - offset%CHAR_BIT;
+ }
+
+ if (n > CHAR_BIT) {
+ memset(&bitmap[offset/CHAR_BIT], -1, n/CHAR_BIT);
+
+ offset += n - n%CHAR_BIT;
+ n %= CHAR_BIT;
+ }
+
+ if (n) {
+ bitmap[offset/CHAR_BIT] |= (1u << n) - 1;
+ }
+}
+
+static int decode_frame(struct lbx_image *img, unsigned n,
+ unsigned char *pixels, unsigned char *pixel_mask)
+{
+ unsigned x, y;
+ long rc;
+
+ rc = lbx_img_seek(img, n);
+ if (rc < 0) {
+ tool_err(-1, "frame %u: invalid frame: %s\n", n, lbx_errmsg());
+ return -1;
+ }
+
+ while ((rc = lbx_img_read_row_header(img, &x, &y)) != 0) {
+ unsigned long offset;
+
+ if (rc < 0) {
+ tool_err(-1, "frame %u: invalid row: %s", n, lbx_errmsg());
+ return -1;
+ }
+
+ offset = (unsigned long) y * img->width + x;
+ rc = lbx_img_read_row_data(img, pixels+offset);
+ if (rc < 0) {
+ tool_err(-1, "frame %u: error reading row: %s\n", n, lbx_errmsg());
+ return -1;
+ }
+
+ set_bits(pixel_mask, offset, rc);
+ }
+
+ return 0;
+}
+
static int
decode(struct lbx_image *img, FILE *palf, FILE *override, int fmt, char **argv)
{
- unsigned char *framebits;
+ unsigned char *pixels = NULL, *pixel_mask = NULL, *framebits = NULL;
struct lbx_colour palette[256];
struct lbx_imginfo info;
- int ret = EXIT_SUCCESS;
+ int rc, ret = EXIT_FAILURE;
int extracted = 0;
unsigned int i;
+ size_t npixels, mask_sz;
assert(fmt >= 0 && fmt < sizeof formats / sizeof formats[0]);
lbx_img_getinfo(img, &info);
+ npixels = img->width;
+ if (img->height && npixels >= SIZE_MAX / img->height) {
+ tool_err(-1, "image too large");
+ goto err;
+ }
+ npixels *= img->height;
+
+ /* Ensure there is at least 1 byte to allocate */
+ if (npixels == 0)
+ npixels = 1;
+
framebits = calloc(1, img->frames / CHAR_BIT + 1);
if (!framebits) {
- return EXIT_FAILURE;
+ tool_err(0, "failed to allocate memory");
+ goto err;
+ }
+
+ pixels = calloc(img->width, img->height);
+ if (!pixels) {
+ tool_err(0, "failed to allocate memory");
+ goto err;
+ }
+
+ mask_sz = npixels / CHAR_BIT + (npixels % CHAR_BIT != 0);
+ pixel_mask = malloc(mask_sz);
+ if (!pixel_mask) {
+ tool_err(0, "failed to allocate memory");
+ goto err;
}
/* Figure out what images we're extracting. */
}
/* Extract the images, in order. */
+ ret = EXIT_SUCCESS;
for (i = 0; i < img->frames; i++) {
- unsigned char **data;
- unsigned char **mask;
-
- if (!(framebits[i / CHAR_BIT] & (1 << (i % CHAR_BIT))))
- continue;
+ if (divides(img->chunk, i))
+ memset(pixel_mask, 0, mask_sz);
- data = lbx_img_getframe(img, i);
- if (!data) {
- tool_err(-1, "error in frame %u: %s", i, lbx_errmsg());
+ rc = decode_frame(img, i, pixels, pixel_mask);
+ if (rc < 0) {
ret = EXIT_FAILURE;
- continue;
+ goto err;
}
- mask = lbx_img_getmask(img);
+ if (framebits[i / CHAR_BIT] & (1u << (i % CHAR_BIT))) {
+ rc = output(i, &formats[fmt], pixels, pixel_mask,
+ img->width, img->height,
+ usepalette ? palette : NULL);
- if (!output(i, &formats[fmt], data, mask,
- img->width, img->height,
- usepalette ? palette : NULL)) {
- extracted = 1;
+ if (rc == 0) {
+ extracted = 1;
+ }
}
}
ret = EXIT_FAILURE;
}
err:
+ free(pixels);
+ free(pixel_mask);
free(framebits);
return ret;
}
projects / liblbx.git / blobdiff