354 lines
8.2 KiB
C
354 lines
8.2 KiB
C
/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Routines to read/write pcx images.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "gr.h"
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#include "grdef.h"
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#include "u_mem.h"
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#include "pcx.h"
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#include "physfsx.h"
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#ifdef OGL
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#include "palette.h"
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#endif
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int pcx_encode_byte(ubyte byt, ubyte cnt, PHYSFS_file *fid);
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int pcx_encode_line(ubyte *inBuff, int inLen, PHYSFS_file *fp);
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/* PCX Header data type */
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typedef struct {
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ubyte Manufacturer;
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ubyte Version;
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ubyte Encoding;
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ubyte BitsPerPixel;
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short Xmin;
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short Ymin;
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short Xmax;
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short Ymax;
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short Hdpi;
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short Vdpi;
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ubyte ColorMap[16][3];
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ubyte Reserved;
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ubyte Nplanes;
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short BytesPerLine;
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ubyte filler[60];
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} __pack__ PCXHeader;
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#define PCXHEADER_SIZE 128
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/*
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* reads n PCXHeader structs from a PHYSFS_file
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*/
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int PCXHeader_read_n(PCXHeader *ph, int n, PHYSFS_file *fp)
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{
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int i;
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for (i = 0; i < n; i++) {
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ph->Manufacturer = PHYSFSX_readByte(fp);
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ph->Version = PHYSFSX_readByte(fp);
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ph->Encoding = PHYSFSX_readByte(fp);
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ph->BitsPerPixel = PHYSFSX_readByte(fp);
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ph->Xmin = PHYSFSX_readShort(fp);
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ph->Ymin = PHYSFSX_readShort(fp);
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ph->Xmax = PHYSFSX_readShort(fp);
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ph->Ymax = PHYSFSX_readShort(fp);
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ph->Hdpi = PHYSFSX_readShort(fp);
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ph->Vdpi = PHYSFSX_readShort(fp);
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PHYSFS_read(fp, &ph->ColorMap, 16*3, 1);
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ph->Reserved = PHYSFSX_readByte(fp);
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ph->Nplanes = PHYSFSX_readByte(fp);
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ph->BytesPerLine = PHYSFSX_readShort(fp);
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PHYSFS_read(fp, &ph->filler, 60, 1);
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}
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return i;
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}
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int pcx_get_dimensions( char *filename, int *width, int *height)
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{
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PHYSFS_file *PCXfile;
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PCXHeader header;
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PCXfile = PHYSFSX_openReadBuffered(filename);
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if (!PCXfile) return PCX_ERROR_OPENING;
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if (PCXHeader_read_n(&header, 1, PCXfile) != 1) {
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PHYSFS_close(PCXfile);
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return PCX_ERROR_NO_HEADER;
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}
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PHYSFS_close(PCXfile);
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*width = header.Xmax - header.Xmin+1;
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*height = header.Ymax - header.Ymin+1;
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return PCX_ERROR_NONE;
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}
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int pcx_read_bitmap( char * filename, grs_bitmap * bmp,int bitmap_type ,ubyte * palette )
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{
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PCXHeader header;
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PHYSFS_file * PCXfile;
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int i, row, col, count, xsize, ysize;
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ubyte data, *pixdata;
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PCXfile = PHYSFSX_openReadBuffered( filename );
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if ( !PCXfile )
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return PCX_ERROR_OPENING;
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// read 128 char PCX header
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if (PCXHeader_read_n( &header, 1, PCXfile )!=1) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_NO_HEADER;
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}
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// Is it a 256 color PCX file?
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if ((header.Manufacturer != 10)||(header.Encoding != 1)||(header.Nplanes != 1)||(header.BitsPerPixel != 8)||(header.Version != 5)) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_WRONG_VERSION;
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}
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// Find the size of the image
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xsize = header.Xmax - header.Xmin + 1;
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ysize = header.Ymax - header.Ymin + 1;
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if ( bitmap_type == BM_LINEAR ) {
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if ( bmp->bm_data == NULL ) {
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gr_init_bitmap_alloc (bmp, bitmap_type, 0, 0, xsize, ysize, xsize);
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}
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}
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if ( bmp->bm_type == BM_LINEAR ) {
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for (row=0; row< ysize ; row++) {
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pixdata = &bmp->bm_data[bmp->bm_rowsize*row];
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for (col=0; col< xsize ; ) {
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if (PHYSFS_read( PCXfile, &data, 1, 1 )!=1 ) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_READING;
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}
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if ((data & 0xC0) == 0xC0) {
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count = data & 0x3F;
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if (PHYSFS_read( PCXfile, &data, 1, 1 )!=1 ) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_READING;
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}
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memset( pixdata, data, count );
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pixdata += count;
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col += count;
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} else {
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*pixdata++ = data;
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col++;
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}
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}
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}
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} else {
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for (row=0; row< ysize ; row++) {
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for (col=0; col< xsize ; ) {
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if (PHYSFS_read( PCXfile, &data, 1, 1 )!=1 ) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_READING;
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}
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if ((data & 0xC0) == 0xC0) {
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count = data & 0x3F;
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if (PHYSFS_read( PCXfile, &data, 1, 1 )!=1 ) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_READING;
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}
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for (i=0;i<count;i++)
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gr_bm_pixel( bmp, col+i, row, data );
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col += count;
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} else {
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gr_bm_pixel( bmp, col, row, data );
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col++;
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}
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}
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}
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}
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// Read the extended palette at the end of PCX file
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if ( palette != NULL ) {
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// Read in a character which should be 12 to be extended palette file
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if (PHYSFS_read( PCXfile, &data, 1, 1 )==1) {
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if ( data == 12 ) {
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if (PHYSFS_read(PCXfile, palette,768, 1)!=1) {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_READING;
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}
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for (i=0; i<768; i++ )
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palette[i] >>= 2;
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}
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} else {
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PHYSFS_close( PCXfile );
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return PCX_ERROR_NO_PALETTE;
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}
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}
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PHYSFS_close(PCXfile);
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return PCX_ERROR_NONE;
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}
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int pcx_write_bitmap( char * filename, grs_bitmap * bmp, ubyte * palette )
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{
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int retval;
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int i;
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ubyte data;
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PCXHeader header;
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PHYSFS_file *PCXfile;
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memset( &header, 0, PCXHEADER_SIZE );
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header.Manufacturer = 10;
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header.Encoding = 1;
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header.Nplanes = 1;
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header.BitsPerPixel = 8;
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header.Version = 5;
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header.Xmax = bmp->bm_w-1;
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header.Ymax = bmp->bm_h-1;
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header.BytesPerLine = bmp->bm_w;
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PCXfile = PHYSFSX_openWriteBuffered(filename);
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if ( !PCXfile )
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return PCX_ERROR_OPENING;
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if (PHYSFS_write(PCXfile, &header, PCXHEADER_SIZE, 1) != 1)
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{
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PHYSFS_close(PCXfile);
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return PCX_ERROR_WRITING;
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}
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for (i=0; i<bmp->bm_h; i++ ) {
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if (!pcx_encode_line( &bmp->bm_data[bmp->bm_rowsize*i], bmp->bm_w, PCXfile )) {
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PHYSFS_close(PCXfile);
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return PCX_ERROR_WRITING;
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}
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}
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// Mark an extended palette
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data = 12;
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if (PHYSFS_write(PCXfile, &data, 1, 1) != 1)
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{
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PHYSFS_close(PCXfile);
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return PCX_ERROR_WRITING;
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}
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// Write the extended palette
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for (i=0; i<768; i++ )
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palette[i] <<= 2;
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retval = PHYSFS_write(PCXfile, palette, 768, 1);
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for (i=0; i<768; i++ )
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palette[i] >>= 2;
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if (retval !=1) {
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PHYSFS_close(PCXfile);
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return PCX_ERROR_WRITING;
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}
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PHYSFS_close(PCXfile);
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return PCX_ERROR_NONE;
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}
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// returns number of bytes written into outBuff, 0 if failed
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int pcx_encode_line(ubyte *inBuff, int inLen, PHYSFS_file *fp)
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{
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ubyte this, last;
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int srcIndex, i;
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register int total;
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register ubyte runCount; // max single runlength is 63
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total = 0;
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last = *(inBuff);
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runCount = 1;
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for (srcIndex = 1; srcIndex < inLen; srcIndex++) {
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this = *(++inBuff);
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if (this == last) {
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runCount++; // it encodes
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if (runCount == 63) {
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if (!(i=pcx_encode_byte(last, runCount, fp)))
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return(0);
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total += i;
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runCount = 0;
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}
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} else { // this != last
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if (runCount) {
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if (!(i=pcx_encode_byte(last, runCount, fp)))
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return(0);
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total += i;
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}
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last = this;
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runCount = 1;
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}
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}
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if (runCount) { // finish up
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if (!(i=pcx_encode_byte(last, runCount, fp)))
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return 0;
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return total + i;
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}
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return total;
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}
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// subroutine for writing an encoded byte pair
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// returns count of bytes written, 0 if error
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int pcx_encode_byte(ubyte byt, ubyte cnt, PHYSFS_file *fid)
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{
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if (cnt) {
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if ( (cnt==1) && (0xc0 != (0xc0 & byt)) ) {
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if(EOF == PHYSFSX_putc(fid, (int)byt))
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return 0; // disk write error (probably full)
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return 1;
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} else {
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if(EOF == PHYSFSX_putc(fid, (int)0xC0 | cnt))
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return 0; // disk write error
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if(EOF == PHYSFSX_putc(fid, (int)byt))
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return 0; // disk write error
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return 2;
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}
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}
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return 0;
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}
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//text for error messges
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static const char pcx_error_messages[] = {
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"No error.\0"
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"Error opening file.\0"
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"Couldn't read PCX header.\0"
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"Unsupported PCX version.\0"
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"Error reading data.\0"
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"Couldn't find palette information.\0"
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"Error writing data.\0"
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};
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//function to return pointer to error message
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const char *pcx_errormsg(int error_number)
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{
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const char *p = pcx_error_messages;
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while (error_number--) {
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if (!p) return NULL;
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p += strlen(p)+1;
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}
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return p;
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}
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