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gtkradiant/contrib/gtkgensurf/bitmap.cpp
TTimo b1bfb19ecd more eol-style 
git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/branches/ZeroRadiant.ab@186 8a3a26a2-13c4-0310-b231-cf6edde360e5
2007-11-04 03:53:53 +00:00

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/*
GenSurf plugin for GtkRadiant
Copyright (C) 2001 David Hyde, Loki software and qeradiant.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "gensurf.h"
void GenerateBitmapMapping ()
{
double value;
double C0, C1;
double x, y;
int i, j;
int O00,O01,O10,O11;
int r0, r1, c0, c1;
int color;
unsigned char *colors;
if (!gbmp.colors)
return;
colors = gbmp.colors;
for (j=0; j<=NV; j++)
{
y = (double)(j*(gbmp.height-1))/(double)NV;
r0 = (int)floor(y);
r1 = (int)ceil(y);
for (i=0; i<=NH; i++)
{
x = (double)(i*(gbmp.width-1))/(double)NH;
c0 = (int)floor(x);
c1 = (int)ceil(x);
O00 = r0*gbmp.width + c0;
O01 = r0*gbmp.width + c1;
O10 = r1*gbmp.width + c0;
O11 = r1*gbmp.width + c1;
C0 = (double)colors[O00] + (double)(colors[O01]-colors[O00])*(x-(double)c0);
C1 = (double)colors[O10] + (double)(colors[O11]-colors[O10])*(x-(double)c0);
color = (int)(C0 + (C1-C0)*(y-r0));
value = CalculateSnapValue(gbmp.black_value + color*((gbmp.white_value-gbmp.black_value)/255.));
switch(Plane)
{
case PLANE_XZ0:
case PLANE_XZ1:
xyz[i][j].p[1] = value;
break;
case PLANE_YZ0:
case PLANE_YZ1:
xyz[i][j].p[0] = value;
break;
default:
xyz[i][j].p[2] = value;
}
}
}
}
static unsigned char* OpenBitmapFile ()
{
int bmWidth;
int bmHeight;
unsigned char bmPlanes;
unsigned char bmBitsPixel;
unsigned char m1,m2;
unsigned long sizeimage;
short res1,res2;
long filesize, pixoff;
long bmisize, compression;
long xscale, yscale;
long colors, impcol;
unsigned long m_bytesRead = 0;
unsigned char *image;
FILE *fp;
fp = fopen (gbmp.name, "rb");
if (fp == NULL)
return NULL;
long rc;
rc = fread(&m1, 1, 1, fp);
m_bytesRead++;
if (rc == -1)
{
fclose(fp);
return NULL;
}
rc = fread(&m2, 1, 1, fp);
m_bytesRead++;
if ((m1 != 'B') || (m2 != 'M'))
{
fclose(fp);
return NULL;
}
rc = fread((long*)&(filesize),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((int*)&(res1),2,1,fp); m_bytesRead+=2;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((int*)&(res2),2,1,fp); m_bytesRead+=2;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(pixoff),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(bmisize),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long *)&(bmWidth),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(bmHeight),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((int*)&(bmPlanes),2,1,fp); m_bytesRead+=2;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((int*)&(bmBitsPixel),2,1,fp); m_bytesRead+=2;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(compression),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(sizeimage),4,1,fp); m_bytesRead+=4;
if (rc != 1) {fclose(fp); return NULL; }
rc = fread((long*)&(xscale),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(yscale),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(colors),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
rc = fread((long*)&(impcol),4,1,fp); m_bytesRead+=4;
if (rc != 1) { fclose(fp); return NULL; }
if (bmBitsPixel != 8)
{
g_FuncTable.m_pfnMessageBox (g_pWnd, "This is not an 8-bit image. GenSurf can't use it.",
"Bitmap", MB_ICONEXCLAMATION);
fclose(fp);
return NULL;
}
if (colors == 0)
colors = 1 << bmBitsPixel;
if (bmBitsPixel != 24)
{
int i;
for (i = 0; i < colors; i++)
{
unsigned char r ,g, b, dummy;
rc = fread(&b, 1, 1, fp);
m_bytesRead++;
if (rc!=1)
{
fclose(fp);
return NULL;
}
rc = fread(&g, 1, 1, fp);
m_bytesRead++;
if (rc!=1)
{
fclose(fp);
return NULL;
}
rc = fread(&r, 1, 1, fp);
m_bytesRead++;
if (rc != 1)
{
fclose(fp);
return NULL;
}
rc = fread(&dummy, 1, 1, fp);
m_bytesRead++;
if (rc != 1)
{
fclose(fp);
return NULL;
}
}
}
if ((long)m_bytesRead > pixoff)
{
fclose(fp);
return NULL;
}
while ((long)m_bytesRead < pixoff)
{
char dummy;
fread(&dummy,1,1,fp);
m_bytesRead++;
}
int w = bmWidth;
int h = bmHeight;
// set the output params
image = (unsigned char*)malloc(w*h);
if (image != NULL)
{
gbmp.width = w;
gbmp.height = h;
unsigned char* outbuf = image;
long row = 0;
long rowOffset = 0;
if (compression == 0) // BI_RGB
{
for (row = 0; row < bmHeight; row++)
{
// which row are we working on?
rowOffset = (long unsigned)row*w;
{
// pixels are packed as 1 , 4 or 8 bit vals. need to unpack them
int bit_count = 0;
unsigned long mask = (1 << bmBitsPixel) - 1;
unsigned char inbyte = 0;
for (int col=0;col<w;col++)
{
int pix = 0;
// if we need another byte
if (bit_count <= 0)
{
bit_count = 8;
if (fread(&inbyte,1,1,fp) != 1)
{
free(image);
fclose(fp);
return NULL;
}
m_bytesRead++;
}
// keep track of where we are in the bytes
bit_count -= bmBitsPixel;
pix = ( inbyte >> bit_count) & mask;
// lookup the color from the colormap - stuff it in our buffer
// swap red and blue
*(outbuf + rowOffset + col) = pix;
}
// read DWORD padding
while ((m_bytesRead-pixoff)&3)
{
char dummy;
if (fread(&dummy,1,1,fp)!=1)
{
free(image);
fclose(fp);
return NULL;
}
m_bytesRead++;
}
}
}
}
else // compression != 0
{
int i, x = 0;
unsigned char c, c1 = 0, *pp;
row = 0;
pp = outbuf;
if (bmBitsPixel == 8)
{
while (row < bmHeight)
{
c = getc(fp);
if (c)
{
// encoded mode
c1 = getc(fp);
for (i = 0; i < c; x++, i++)
{
*pp = c1; pp++;
}
}
else
{
// c==0x00, escape codes
c = getc(fp);
if (c == 0x00) // end of line
{
row++;
x = 0;
pp = outbuf + row*bmWidth;
}
else if (c == 0x01)
break; // end of pic
else if (c == 0x02) // delta
{
c = getc(fp);
x += c;
c = getc(fp);
row += c;
pp = outbuf + x + row*bmWidth;
}
else // absolute mode
{
for (i = 0; i < c; x++, i++)
{
c1 = getc(fp);
*pp = c1; pp++;
}
if (c & 1)
getc(fp); // odd length run: read an extra pad byte
}
}
}
}
else if (bmBitsPixel == 4)
{
while (row < bmHeight)
{
c = getc(fp);
if (c)
{
// encoded mode
c1 = getc(fp);
for (i = 0; i < c; x++, i++)
{
*pp = (i&1) ? (c1 & 0x0f) : ((c1>>4)&0x0f); pp++;
}
}
else
{
// c==0x00, escape codes
c = getc(fp);
if (c == 0x00) // end of line
{
row++;
x = 0;
pp = outbuf + bmHeight*bmWidth;
}
else if (c == 0x01)
break; // end of pic
else if (c == 0x02) // delta
{
c = getc(fp);
x += c;
c = getc(fp);
row += c;
pp = outbuf + x + row*bmWidth;
}
else // absolute mode
{
for (i = 0; i < c; x++, i++)
{
if ((i&1) == 0)
c1 = getc(fp);
*pp = (i&1) ? (c1 & 0x0f) : ((c1>>4)&0x0f); pp++;
}
if (((c&3) == 1) || ((c&3) == 2))
getc(fp); // odd length run: read an extra pad byte
}
}
}
}
}
}
fclose(fp);
return image;
}
bool OpenBitmap ()
{
if (gbmp.colors)
free (gbmp.colors);
gbmp.colors = OpenBitmapFile ();
if (!gbmp.colors)
{
char Text[256];
sprintf (Text, "Error opening %s", gbmp.name);
g_FuncTable.m_pfnMessageBox (g_pWnd, Text, "Bitmap", MB_ICONEXCLAMATION);
strcpy (gbmp.name, "");
}
if (g_pWnd)
{
gtk_entry_set_text (GTK_ENTRY (g_object_get_data (G_OBJECT (g_pWnd), "bmp_file")), gbmp.name);
gtk_widget_set_sensitive (GTK_WIDGET (g_object_get_data (G_OBJECT (g_pWnd), "bmp_reload")),
strlen (gbmp.name) ? TRUE : FALSE);
UpdatePreview (true);
}
return (gbmp.colors != NULL);
}
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