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|
/* Project nGenEx
Destroyer Studios LLC
Copyright © 1997-2004. All Rights Reserved.
SUBSYSTEM: nGenEx.lib
FILE: PCX.cpp
AUTHOR: John DiCamillo
OVERVIEW
========
PCX image file loader
*/
#include "MemDebug.h"
#include "PCX.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// +--------------------------------------------------------------------+
#define MAX_SIZE (4*1024*1024)
enum { BYTEMODE, RUNMODE };
// +--------------------------------------------------------------------+
PcxImage::PcxImage()
: width(0), height(0), bitmap(0), himap(0), imagebytes(0)
{ }
PcxImage::PcxImage(short w, short h, unsigned char* bits, unsigned char* colors)
: bitmap(0), himap(0)
{
hdr.manufacturer = 10; // Always set to 10
hdr.version = 5; // Always 5 for 256-color files
hdr.encoding = 1; // Always set to 1
hdr.bits_per_pixel = 8; // Should be 8 for 256-color files
hdr.xmin = 0;
hdr.xmax = w-1;
hdr.ymin = 0;
hdr.ymax = h-1;
hdr.hres = 0x48;
hdr.vres = 0x48;
hdr.palette16[ 0] = (unsigned char) 0x00;
hdr.palette16[ 1] = (unsigned char) 0x00;
hdr.palette16[ 2] = (unsigned char) 0x00;
hdr.palette16[ 3] = (unsigned char) 0x80;
hdr.palette16[ 4] = (unsigned char) 0x00;
hdr.palette16[ 5] = (unsigned char) 0x00;
hdr.palette16[ 6] = (unsigned char) 0x00;
hdr.palette16[ 7] = (unsigned char) 0x80;
hdr.palette16[ 8] = (unsigned char) 0x00;
hdr.palette16[ 9] = (unsigned char) 0x80;
hdr.palette16[10] = (unsigned char) 0x80;
hdr.palette16[11] = (unsigned char) 0x00;
hdr.palette16[12] = (unsigned char) 0x00;
hdr.palette16[13] = (unsigned char) 0x00;
hdr.palette16[14] = (unsigned char) 0x80;
hdr.palette16[15] = (unsigned char) 0x80;
hdr.palette16[16] = (unsigned char) 0x00;
hdr.palette16[17] = (unsigned char) 0x80;
hdr.palette16[18] = (unsigned char) 0x00;
hdr.palette16[19] = (unsigned char) 0x80;
hdr.palette16[20] = (unsigned char) 0x80;
hdr.palette16[21] = (unsigned char) 0xC0;
hdr.palette16[22] = (unsigned char) 0xC0;
hdr.palette16[23] = (unsigned char) 0xC0;
hdr.palette16[24] = (unsigned char) 0xC0;
hdr.palette16[25] = (unsigned char) 0xDC;
hdr.palette16[26] = (unsigned char) 0xC0;
hdr.palette16[27] = (unsigned char) 0xA6;
hdr.palette16[28] = (unsigned char) 0xCA;
hdr.palette16[29] = (unsigned char) 0xF0;
hdr.palette16[30] = (unsigned char) 0x33;
hdr.palette16[31] = (unsigned char) 0x2B;
hdr.palette16[32] = (unsigned char) 0x1F;
hdr.palette16[33] = (unsigned char) 0x2B;
hdr.palette16[34] = (unsigned char) 0x23;
hdr.palette16[35] = (unsigned char) 0x1B;
hdr.palette16[36] = (unsigned char) 0x5F;
hdr.palette16[37] = (unsigned char) 0x5F;
hdr.palette16[38] = (unsigned char) 0x5F;
hdr.palette16[39] = (unsigned char) 0x2F;
hdr.palette16[40] = (unsigned char) 0x2F;
hdr.palette16[41] = (unsigned char) 0x2F;
hdr.palette16[42] = (unsigned char) 0x27;
hdr.palette16[43] = (unsigned char) 0x27;
hdr.palette16[44] = (unsigned char) 0x27;
hdr.palette16[45] = (unsigned char) 0x1F;
hdr.palette16[46] = (unsigned char) 0x1F;
hdr.palette16[47] = (unsigned char) 0x1F;
hdr.reserved = 0; // Reserved for future use
hdr.color_planes = 1; // Color planes
hdr.bytes_per_line = w; // Number of bytes in 1 line of pixels
hdr.palette_type = 1; // Should be 1 for color palette
for (unsigned int i = 0; i < 58; i++)
hdr.filler[i] = 0;
width = w;
height = h;
imagebytes = width * height;
bitmap = new(__FILE__,__LINE__) unsigned char [imagebytes];
if (bitmap) {
for (i = 0; i < imagebytes; i++)
bitmap[i] = bits[i];
unsigned char* p = pal;
for (i = 0; i < 256; i++) {
*p++ = *colors++;
*p++ = *colors++;
*p++ = *colors++;
colors++;
}
}
}
PcxImage::PcxImage(short w, short h, unsigned long* hibits)
: bitmap(0), himap(0)
{
hdr.manufacturer = 10; // Always set to 10
hdr.version = 5; // Always 5 for true color files
hdr.encoding = 1; // Always set to 1
hdr.bits_per_pixel = 8; // Should be 8 for true color files
hdr.xmin = 0;
hdr.xmax = w-1;
hdr.ymin = 0;
hdr.ymax = h-1;
hdr.hres = 0x48;
hdr.vres = 0x48;
hdr.palette16[ 0] = (unsigned char) 0x00;
hdr.palette16[ 1] = (unsigned char) 0x00;
hdr.palette16[ 2] = (unsigned char) 0x00;
hdr.palette16[ 3] = (unsigned char) 0x80;
hdr.palette16[ 4] = (unsigned char) 0x00;
hdr.palette16[ 5] = (unsigned char) 0x00;
hdr.palette16[ 6] = (unsigned char) 0x00;
hdr.palette16[ 7] = (unsigned char) 0x80;
hdr.palette16[ 8] = (unsigned char) 0x00;
hdr.palette16[ 9] = (unsigned char) 0x80;
hdr.palette16[10] = (unsigned char) 0x80;
hdr.palette16[11] = (unsigned char) 0x00;
hdr.palette16[12] = (unsigned char) 0x00;
hdr.palette16[13] = (unsigned char) 0x00;
hdr.palette16[14] = (unsigned char) 0x80;
hdr.palette16[15] = (unsigned char) 0x80;
hdr.palette16[16] = (unsigned char) 0x00;
hdr.palette16[17] = (unsigned char) 0x80;
hdr.palette16[18] = (unsigned char) 0x00;
hdr.palette16[19] = (unsigned char) 0x80;
hdr.palette16[20] = (unsigned char) 0x80;
hdr.palette16[21] = (unsigned char) 0xC0;
hdr.palette16[22] = (unsigned char) 0xC0;
hdr.palette16[23] = (unsigned char) 0xC0;
hdr.palette16[24] = (unsigned char) 0xC0;
hdr.palette16[25] = (unsigned char) 0xDC;
hdr.palette16[26] = (unsigned char) 0xC0;
hdr.palette16[27] = (unsigned char) 0xA6;
hdr.palette16[28] = (unsigned char) 0xCA;
hdr.palette16[29] = (unsigned char) 0xF0;
hdr.palette16[30] = (unsigned char) 0x33;
hdr.palette16[31] = (unsigned char) 0x2B;
hdr.palette16[32] = (unsigned char) 0x1F;
hdr.palette16[33] = (unsigned char) 0x2B;
hdr.palette16[34] = (unsigned char) 0x23;
hdr.palette16[35] = (unsigned char) 0x1B;
hdr.palette16[36] = (unsigned char) 0x5F;
hdr.palette16[37] = (unsigned char) 0x5F;
hdr.palette16[38] = (unsigned char) 0x5F;
hdr.palette16[39] = (unsigned char) 0x2F;
hdr.palette16[40] = (unsigned char) 0x2F;
hdr.palette16[41] = (unsigned char) 0x2F;
hdr.palette16[42] = (unsigned char) 0x27;
hdr.palette16[43] = (unsigned char) 0x27;
hdr.palette16[44] = (unsigned char) 0x27;
hdr.palette16[45] = (unsigned char) 0x1F;
hdr.palette16[46] = (unsigned char) 0x1F;
hdr.palette16[47] = (unsigned char) 0x1F;
hdr.reserved = 0; // Reserved for future use
hdr.color_planes = 3; // Color planes
hdr.bytes_per_line = w; // Number of bytes in 1 line of pixels
hdr.palette_type = 1; // Should be 1 for color palette
for (unsigned int i = 0; i < 58; i++)
hdr.filler[i] = 0;
width = w;
height = h;
imagebytes = width * height;
himap = new(__FILE__,__LINE__) unsigned long [imagebytes];
if (himap) {
for (i = 0; i < imagebytes; i++)
himap[i] = hibits[i];
}
}
PcxImage::~PcxImage()
{
delete [] bitmap;
delete [] himap;
}
// +--------------------------------------------------------------------+
int PcxImage::Load(char *filename)
{
unsigned long i;
short mode=BYTEMODE, bytecount;
unsigned char abyte, *p;
FILE *f;
f = fopen(filename,"rb");
if (f == NULL)
return PCX_NOFILE;
fread(&hdr, sizeof(PcxHeader), 1, f);
// read 256 color PCX file
if (hdr.color_planes == 1) {
width = 1 + hdr.xmax - hdr.xmin;
height = 1 + hdr.ymax - hdr.ymin;
imagebytes = width * height;
if (imagebytes > MAX_SIZE)
return PCX_TOOBIG;
// get palette from pcx file
fseek(f,-768L,SEEK_END);
fread(pal,768,1,f);
// now go back and read the pixel data:
fseek(f,sizeof(PcxHeader),SEEK_SET);
delete [] himap; himap = 0;
delete [] bitmap; bitmap = 0;
himap = new(__FILE__,__LINE__) unsigned long [imagebytes];
if (himap == NULL)
return PCX_NOMEM;
// force alpha channel to 255
memset(himap, 0xff, imagebytes*4);
unsigned long* pix = himap;
for (i=0; i<imagebytes; i++) {
if (mode == BYTEMODE) {
abyte = fgetc(f);
if (abyte > 0xbf) {
bytecount = abyte & 0x3f;
abyte = fgetc(f);
if (--bytecount > 0)
mode = RUNMODE;
}
}
else if (--bytecount == 0) {
mode = BYTEMODE;
}
*pix++ = 0xff000000 | (pal[3*abyte] << 16) | (pal[3*abyte+1] << 8) | (pal[3*abyte+2]);
}
}
// read 24-bit (true COLOR) PCX file
else {
width = 1 + hdr.xmax - hdr.xmin;
height = 1 + hdr.ymax - hdr.ymin;
imagebytes = width * height;
if (imagebytes > MAX_SIZE)
return PCX_TOOBIG;
delete [] himap; himap = 0;
delete [] bitmap; bitmap = 0;
himap = new(__FILE__,__LINE__) unsigned long [imagebytes];
if (himap == NULL)
return PCX_NOMEM;
// force alpha channel to 255
memset(himap, 0xff, imagebytes*4);
for (int row = 0; row < height; row++) {
// RED, GREEN, BLUE
for (int plane = 2; plane >= 0; plane--) {
p = ((unsigned char*) himap) + width*row*4 + plane;
for (int col = 0; col < width; col++) {
if (mode == BYTEMODE) {
abyte = fgetc(f);
if (abyte > 0xbf) {
bytecount = abyte & 0x3f;
abyte = fgetc(f);
if (--bytecount > 0)
mode = RUNMODE;
}
}
else if (--bytecount == 0) {
mode = BYTEMODE;
}
*p = abyte;
p += 4;
}
}
}
}
fclose(f);
return PCX_OK;
}
// +--------------------------------------------------------------------+
int PcxImage::LoadBuffer(unsigned char* buf, int len)
{
unsigned long i;
short mode=BYTEMODE, bytecount;
unsigned char abyte, *p;
unsigned char* fp;
if (buf == NULL)
return PCX_NOFILE;
fp = buf;
memcpy(&hdr, buf, sizeof(PcxHeader));
fp += sizeof(PcxHeader);
// read 256 color PCX file
if (hdr.color_planes == 1) {
width = 1 + hdr.xmax - hdr.xmin;
height = 1 + hdr.ymax - hdr.ymin;
imagebytes = width * height;
if (imagebytes > MAX_SIZE)
return PCX_TOOBIG;
// get palette from end of pcx file
memcpy(pal,buf+len-768,768);
delete [] himap; himap = 0;
delete [] bitmap; bitmap = 0;
himap = new(__FILE__,__LINE__) unsigned long [imagebytes];
if (himap == NULL)
return PCX_NOMEM;
memset(himap, 0, imagebytes*4);
unsigned long* pix = himap;
for (i=0; i<imagebytes; i++) {
if (mode == BYTEMODE) {
abyte = *fp++;
if (abyte > 0xbf) {
bytecount = abyte & 0x3f;
abyte = *fp++;
if (--bytecount > 0)
mode = RUNMODE;
}
}
else if (--bytecount == 0) {
mode = BYTEMODE;
}
*pix++ = 0xff000000 | (pal[3*abyte] << 16) | (pal[3*abyte+1] << 8) | (pal[3*abyte+2]);
}
}
// read 24-bit (true COLOR) PCX file
else {
width = 1 + hdr.xmax - hdr.xmin;
height = 1 + hdr.ymax - hdr.ymin;
imagebytes = width * height;
if (imagebytes > MAX_SIZE)
return PCX_TOOBIG;
delete [] himap; himap = 0;
delete [] bitmap; bitmap = 0;
himap = new(__FILE__,__LINE__) unsigned long [imagebytes];
if (himap == NULL)
return PCX_NOMEM;
memset(himap, 0, imagebytes*4);
for (int row = 0; row < height; row++) {
// RED, GREEN, BLUE
for (int plane = 2; plane >= 0; plane--) {
p = ((unsigned char*) himap) + width*row*4 + plane;
for (int col = 0; col < width; col++) {
if (mode == BYTEMODE) {
abyte = *fp++;
if (abyte > 0xbf) {
bytecount = abyte & 0x3f;
abyte = *fp++;
if (--bytecount > 0)
mode = RUNMODE;
}
}
else if (--bytecount == 0) {
mode = BYTEMODE;
}
*p = abyte;
p += 4;
}
}
}
}
return PCX_OK;
}
// +--------------------------------------------------------------------+
int PcxImage::Save(char *filename)
{
short mode=BYTEMODE;
FILE *f;
f = fopen(filename,"wb");
if (f == NULL)
return PCX_NOFILE;
fwrite(&hdr, sizeof(PcxHeader), 1, f);
if (hdr.color_planes == 1) {
unsigned char *p = bitmap;
unsigned long total = imagebytes;
unsigned long row = 0;
unsigned char palette_marker = 12;
while (total) {
unsigned char* start = p;
unsigned char count = 0;
while (*start == *p && count < 0x3f && row < width) {
p++;
count++;
row++;
}
if (count > 1 || *start > 0xbf) {
unsigned char b[2];
b[0] = 0xc0 | count;
b[1] = *start;
fwrite(b, 2, 1, f);
}
else {
fwrite(start, 1, 1, f);
}
total -= count;
if (row == width)
row = 0;
}
fwrite(&palette_marker,1,1,f);
fwrite(pal,768,1,f);
}
// write 24-bit (TRUE COLOR) PCX file
else {
for (int row = 0; row < height; row++) {
for (int plane = 2; plane >= 0; plane--) {
unsigned long col = 0;
unsigned char* p = ((unsigned char*) himap) + width*row*4 + plane;
while (col < width) {
unsigned char* start = p;
unsigned char count = 0;
while (*start == *p && count < 0x3f && col < width) {
p += 4;
count++;
col++;
}
if (count > 1 || *start > 0xbf) {
unsigned char b[2];
b[0] = 0xc0 | count;
b[1] = *start;
fwrite(b, 2, 1, f);
}
else {
fwrite(start, 1, 1, f);
}
}
}
}
}
fclose(f);
return PCX_OK; // return success
}
|
