/* This file is part of Advanced Strategic Command; http://www.asc-hq.de Copyright (C) 1994-1999 Martin Bickel and Marc Schellenberger 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 2 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; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include "../basegfx.h" #include "vesa.h" /* * example.c * * This file illustrates how to use the IJG code as a subroutine library * to read or write JPEG image files. You should look at this code in * conjunction with the documentation file libjpeg.doc. * * This code will not do anything useful as-is, but it may be helpful as a * skeleton for constructing routines that call the JPEG library. * * We present these routines in the same coding style used in the JPEG code * (ANSI function definitions, etc); but you are of course free to code your * routines in a different style if you prefer. */ #include /* * Include file for users of JPEG library. * You will need to have included system headers that define at least * the typedefs FILE and size_t before you can include jpeglib.h. * (stdio.h is sufficient on ANSI-conforming systems.) * You may also wish to include "jerror.h". */ #include "..\libs\jpeg\jpeglib.h" /* * is used for the optional error recovery mechanism shown in * the second part of the example. */ #include /******************** JPEG COMPRESSION SAMPLE INTERFACE *******************/ /* This half of the example shows how to feed data into the JPEG compressor. * We present a minimal version that does not worry about refinements such * as error recovery (the JPEG code will just exit() if it gets an error). */ /* * IMAGE DATA FORMATS: * * The standard input image format is a rectangular array of pixels, with * each pixel having the same number of "component" values (color channels). * Each pixel row is an array of JSAMPLEs (which typically are unsigned chars). * If you are working with color data, then the color values for each pixel * must be adjacent in the row; for example, R,G,B,R,G,B,R,G,B,... for 24-bit * RGB color. * * For this example, we'll assume that this data structure matches the way * our application has stored the image in memory, so we can just pass a * pointer to our image buffer. In particular, let's say that the image is * RGB color and is described by: */ extern JSAMPLE * image_buffer; /* Points to large array of R,G,B-order data */ extern int image_height; /* Number of rows in image */ extern int image_width; /* Number of columns in image */ /******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/ /* This half of the example shows how to read data from the JPEG decompressor. * It's a bit more refined than the above, in that we show: * (a) how to modify the JPEG library's standard error-reporting behavior; * (b) how to allocate workspace using the library's memory manager. * * Just to make this example a little different from the first one, we'll * assume that we do not intend to put the whole image into an in-memory * buffer, but to send it line-by-line someplace else. We need a one- * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG * memory manager allocate it for us. This approach is actively quite useful * because we don't need to remember to deallocate the buffer separately: it * will go away automatically when the JPEG object is cleaned up. */ /* * ERROR HANDLING: * * The JPEG library's standard error handler (jerror.c) is divided into * several "methods" which you can override individually. This lets you * adjust the behavior without duplicating a lot of code, which you might * have to update with each future release. * * Our example here shows how to override the "error_exit" method so that * control is returned to the library's caller when a fatal error occurs, * rather than calling exit() as the standard error_exit method does. * * We use C's setjmp/longjmp facility to return control. This means that the * routine which calls the JPEG library must first execute a setjmp() call to * establish the return point. We want the replacement error_exit to do a * longjmp(). But we need to make the setjmp buffer accessible to the * error_exit routine. To do this, we make a private extension of the * standard JPEG error handler object. (If we were using C++, we'd say we * were making a subclass of the regular error handler.) * * Here's the extended error handler struct: */ struct my_error_mgr { struct jpeg_error_mgr pub; /* "public" fields */ jmp_buf setjmp_buffer; /* for return to caller */ }; typedef struct my_error_mgr * my_error_ptr; /* * Here's the routine that will replace the standard error_exit method: */ METHODDEF(void) my_error_exit (j_common_ptr cinfo) { /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */ my_error_ptr myerr = (my_error_ptr) cinfo->err; /* Always display the message. */ /* We could postpone this until after returning, if we chose. */ (*cinfo->err->output_message) (cinfo); /* Return control to the setjmp point */ longjmp(myerr->setjmp_buffer, 1); } /* * Sample routine for JPEG decompression. We assume that the source file name * is passed in. We want to return 1 on success, 0 on error. */ /* extern "C" void putpixel(int x1, int y1, int color); #pragma aux putpixel parm [ ebx ] [ eax ] [ edx ] modify [ ecx ] */ int linenum ; struct { int actpos; int linelen; int page; } bankparams; void put_scanline_someplace ( char* ptr, int width ) { width /= 3; if ( agmp->windowstatus == 100 ) { int rfp = agmp->redfieldposition; int gfp = agmp->greenfieldposition; int bfp = agmp->bluefieldposition; char* dst = (char*) ( agmp->linearaddress + linenum * agmp->bytesperscanline ); for ( int m = 0; m < width; m++ ) { int pp = 0; pp += (*ptr++) << rfp; pp += (*ptr++) << gfp; pp += (*ptr++) << bfp; int* pi = (int*) dst; *pi = pp; dst += agmp->byteperpix; } } else { bankparams.actpos = linenum * bankparams.linelen; int p = bankparams.actpos >> 16; if ( bankparams.page != p ) { setvirtualpagepos( p ); bankparams.page = p; } bankparams.actpos -= p << 16; if ( bankparams.actpos + bankparams.linelen >= 0x10000 ) { int hop[4]; hop[0] = agmp->redfieldposition / 8; hop[1] = agmp->greenfieldposition / 8 - agmp-> redfieldposition / 8; hop[2] = agmp->bluefieldposition / 8 - agmp-> greenfieldposition / 8; hop[3] = agmp->byteperpix - agmp-> bluefieldposition / 8 ; for ( int m = 0; m < width; m++ ) { for ( int j = 0; j < 4; j++ ) { bankparams.actpos += hop[j]; if ( bankparams.actpos < 0 ) { setvirtualpagepos( --bankparams.page ); bankparams.actpos += 0x10000; } else if ( bankparams.actpos > 0x10000 ) { setvirtualpagepos( ++bankparams.page ); bankparams.actpos -= 0x10000; } if ( j < 3 ) *((char*)(agmp->linearaddress + bankparams.actpos)) = *ptr++; } } } else { int rfp = agmp->redfieldposition; int gfp = agmp->greenfieldposition; int bfp = agmp->bluefieldposition; /* char* dst = (char*) ( agmp->linearaddress + bankparams.actpos ); for ( int m = 0; m < width; m++ ) { for ( int j = 0; j < 3; j++ ) { dst += hop[j]; *dst = *ptr++; } dst += hop[3]; } */ char* dst = (char*) ( agmp->linearaddress + bankparams.actpos ); for ( int m = 0; m < width; m++ ) { int pp = 0; pp += (*ptr++) << rfp; pp += (*ptr++) << gfp; pp += (*ptr++) << bfp; int* pi = (int*) dst; *pi = pp; dst += agmp->byteperpix; } } } linenum++; } GLOBAL(int) read_JPEG_file ( pnstream strm ) { bankparams.linelen = agmp->bytesperscanline; bankparams.actpos = 0; bankparams.page = 0; linenum = 0; setvirtualpagepos( 0 ); /* This struct contains the JPEG decompression parameters and pointers to * working space (which is allocated as needed by the JPEG library). */ struct jpeg_decompress_struct cinfo; /* We use our private extension JPEG error handler. * Note that this struct must live as long as the main JPEG parameter * struct, to avoid dangling-pointer problems. */ struct my_error_mgr jerr; /* More stuff */ JSAMPARRAY buffer; /* Output row buffer */ int row_stride; /* physical row width in output buffer */ /* In this example we want to open the input file before doing anything else, * so that the setjmp() error recovery below can assume the file is open. * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that * requires it in order to read binary files. */ /* Step 1: allocate and initialize JPEG decompression object */ /* We set up the normal JPEG error routines, then override error_exit. */ cinfo.err = jpeg_std_error(&jerr.pub); jerr.pub.error_exit = my_error_exit; /* Establish the setjmp return context for my_error_exit to use. */ /* Now we can initialize the JPEG decompression object. */ jpeg_create_decompress(&cinfo); /* Step 2: specify data source (eg, a file) */ jpeg_stdio_src(&cinfo, strm ); /* Step 3: read file parameters with jpeg_read_header() */ (void) jpeg_read_header(&cinfo, TRUE); /* We can ignore the return value from jpeg_read_header since * (a) suspension is not possible with the stdio data source, and * (b) we passed TRUE to reject a tables-only JPEG file as an error. * See libjpeg.doc for more info. */ /* Step 4: set parameters for decompression */ /* In this example, we don't need to change any of the defaults set by * jpeg_read_header(), so we do nothing here. */ /* Step 5: Start decompressor */ (void) jpeg_start_decompress(&cinfo); /* We can ignore the return value since suspension is not possible * with the stdio data source. */ /* We may need to do some setup of our own at this point before reading * the data. After jpeg_start_decompress() we have the correct scaled * output image dimensions available, as well as the output colormap * if we asked for color quantization. * In this example, we need to make an output work buffer of the right size. */ /* JSAMPLEs per row in output buffer */ row_stride = cinfo.output_width * cinfo.output_components; /* Make a one-row-high sample array that will go away when done with image */ buffer = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1); /* Step 6: while (scan lines remain to be read) */ /* jpeg_read_scanlines(...); */ /* Here we use the library's state variable cinfo.output_scanline as the * loop counter, so that we don't have to keep track ourselves. */ while (cinfo.output_scanline < cinfo.output_height) { /* jpeg_read_scanlines expects an array of pointers to scanlines. * Here the array is only one element long, but you could ask for * more than one scanline at a time if that's more convenient. */ (void) jpeg_read_scanlines(&cinfo, buffer, 1); /* Assume put_scanline_someplace wants a pointer and sample count. */ put_scanline_someplace((char*) buffer[0], row_stride); } /* Step 7: Finish decompression */ (void) jpeg_finish_decompress(&cinfo); /* We can ignore the return value since suspension is not possible * with the stdio data source. */ /* Step 8: Release JPEG decompression object */ /* This is an important step since it will release a good deal of memory. */ jpeg_destroy_decompress(&cinfo); /* After finish_decompress, we can close the input file. * Here we postpone it until after no more JPEG errors are possible, * so as to simplify the setjmp error logic above. (actively, I don't * think that jpeg_destroy can do an error exit, but why assume anything...) */ /* At this point you may want to check to see whether any corrupt-data * warnings occurred (test whether jerr.pub.num_warnings is nonzero). */ /* And we're done! */ return 1; } /* * SOME FINE POINTS: * * In the above code, we ignored the return value of jpeg_read_scanlines, * which is the number of scanlines actively read. We could get away with * this because we asked for only one line at a time and we weren't using * a suspending data source. See libjpeg.doc for more info. * * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress(); * we should have done it beforehand to ensure that the space would be * counted against the JPEG max_memory setting. In some systems the above * code would risk an out-of-memory error. However, in general we don't * know the output image dimensions before jpeg_start_decompress(), unless we * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this. * * Scanlines are returned in the same order as they appear in the JPEG file, * which is standardly top-to-bottom. If you must emit data bottom-to-top, * you can use one of the virtual arrays provided by the JPEG memory manager * to invert the data. See wrbmp.c for an example. * * As with compression, some operating modes may require temporary files. * On some systems you may need to set up a signal handler to ensure that * temporary files are deleted if the program is interrupted. See libjpeg.doc. */ /* int main( void ) { read_JPEG_file ( "lcac2.jpg" ); getch(); return 1; } */ int getbestpictname ( char* filename , char* c, char* e ) { char* d = c; strcpy ( c, filename ); while ( *d != 0 && *d != '.' ) d++; // if ( *d == '.' ) { *d = 0; strcpy ( e, c ); strcat ( e, ".jpg" ); strcat ( c, ".pcx" ); // } int n = 0; tfindfile ff ( c ); if ( ff.getnextname()) n += 1; tfindfile fff ( e ); if ( fff.getnextname()) n += 2; return n; }