Attachment 45697 Details for Bug 36293 – tool sourcecode, compilable with "gcc ora2png.c -lora -oora2png"

tool sourcecode, compilable with "gcc ora2png.c -lora -oora2png"

ora2png.c (text/x-csrc), 3.11 KB, created by David Gowers on 2011-04-16 01:59:21 UTC

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Filename:

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Creator: David Gowers

Created: 2011-04-16 01:59:21 UTC

Size: 3.11 KB

patch

obsolete

>/* ora2png, c version. By David Gowers.
> *
> * Includes code from http://www.labbookpages.co.uk/software/imgProc/libPNG.html
> *
> * Syntax:
> *
> *   ora2png [orafiles..]
> *
> * Writes a corresponding PNG for each ORA.
> *
> * Currently writes RGBA images.
> *
> * Caveat:
> *   * does not handle images with frames correctly.
> *     (because libora doesn't, at the time of writing).
> *     feeding it such an image will cause it to crash
> * */
>
>#include "ora.h"
>#include <png.h>
>#include <stdio.h>
>#include <malloc.h>
>
>
>int save_rgba_png (char *filename, int width, int height, unsigned char *buffer)
>{
>  int code = 0;
>  FILE *fp;
>  png_structp png_ptr;
>  png_infop info_ptr;
>
>  // Open file for writing (binary mode)
>  fp = fopen(filename, "wb");
>  if (fp == NULL) {
>    fprintf(stderr, "Could not open file %s for writing\n", filename);
>    code = 1;
>    goto finalise;
>  }
>
>  // Initialize write structure
>  png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
>  if (png_ptr == NULL) {
>    fprintf(stderr, "Could not allocate write struct\n");
>    code = 1;
>    goto finalise;
>  }
>
>  // Initialize info structure
>  info_ptr = png_create_info_struct(png_ptr);
>  if (info_ptr == NULL) {
>    fprintf(stderr, "Could not allocate info struct\n");
>    code = 1;
>    goto finalise;
>  }
>
>  // Setup Exception handling
>  if (setjmp(png_jmpbuf(png_ptr))) {
>    fprintf(stderr, "Error during png creation\n");
>    code = 1;
>    goto finalise;
>  }
>
>  png_init_io(png_ptr, fp);
>
>  // Write header (8 bit colour depth)
>  png_set_IHDR(png_ptr, info_ptr, width, height,
>      8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
>      PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
>
>  // Set title
>  /*if (title != NULL) {
>    png_text title_text;
>    title_text.compression = PNG_TEXT_COMPRESSION_NONE;
>    title_text.key = "Title";
>    title_text.text = title;
>    png_set_text(png_ptr, info_ptr, &title_text, 1);
>  }*/
>
>  png_write_info(png_ptr, info_ptr);
>  // Write image data
>  int y;
>  for (y=0 ; y<height ; y++)
>  {
>    png_write_row(png_ptr, (buffer + (y*width*4)));
>  }
>
>  // End write
>  png_write_end(png_ptr, NULL);
>
>  finalise:
>  if (fp != NULL) fclose(fp);
>  if (info_ptr != NULL) png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
>  if (png_ptr != NULL) png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
>
>  return code;
>}
>
>int main (int argc, char **argv)
>{
>  int i;
>  int errcode;
>  for (i=1;i<argc;i++)
>  {
>    ORA ora;
>    int width;
>    int height;
>    unsigned char *data;
>    char *filename;
>    char *newfilename;
>    int filename_len;
>
>    filename = argv[i];
>    errcode = ora_open (filename, ORA_FILE_READ, &ora);
>    ora_get_document_size (ora, &width, &height);
>
>    filename_len = strlen(filename);
>    newfilename = (char *)(malloc(filename_len));
>    strcpy (newfilename, filename);
>    newfilename [filename_len - 3] = 'p'; // hack hack hack
>    newfilename [filename_len - 2] = 'n';
>    newfilename [filename_len - 1] = 'g';
>    printf ("%s : %dx%d -> %s\n", filename, width, height, newfilename);
>    ora_render_document (ora, &data);
>
>    save_rgba_png (newfilename, width, height, data);
>    ora_close (ora);
>    free (newfilename);
>  }
>  return;
>}

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Attachments on bug 36293: 45697 | 45698

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