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bitmaplib.c
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bitmaplib.c
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#include <stdio.h>
# include <stdlib.h>
#include <string.h>
#include <math.h>
#include "bitmaplib.h"
/*
Create a bitmap structure
*/
BITMAP4 *Create_Bitmap(int nx,int ny)
{
return((BITMAP4 *)malloc(nx*ny*sizeof(BITMAP4)));
}
/*
Destroy the bitmap structure
*/
void Destroy_Bitmap(BITMAP4 *bm)
{
free(bm);
}
/*
Compare two pixels
*/
int Same_BitmapPixel(BITMAP4 p1,BITMAP4 p2)
{
if (p1.r != p2.r) return(FALSE);
if (p1.g != p2.g) return(FALSE);
if (p1.b != p2.b) return(FALSE);
if (p1.a != p2.a) return(FALSE);
return(TRUE);
}
/*
Write a bitmap to a file
The format is as follows
1 == tga
11 == tga with alpha
12 == compressed tga
13 == compressed tga with alpha
2 == ppm
3 == rgb
4 == raw grey scale
5 == tiff
6 == EPS colour (Encapsulated PostScript)
7 == EPS black and white
8 == raw
9 == BMP
A negative format indicates a vertical flip
*/
void Write_Bitmap(FILE *fptr,BITMAP4 *bm,int nx,int ny,int format)
{
int i,j,offset;
long index,rowindex;
int linelength = 0,size;
char buffer[1024];
/* Write the header */
switch (ABS(format)) {
case 1:
case 11:
case 12:
case 13:
putc(0,fptr); /* Length of ID */
putc(0,fptr); /* No colour map */
if (ABS(format) == 12 || ABS(format) == 13)
putc(10,fptr); /* compressed RGB */
else
putc(2,fptr); /* uncompressed RGB */
putc(0,fptr); /* Index of colour map entry */
putc(0,fptr);
putc(0,fptr); /* Colour map length */
putc(0,fptr);
putc(0,fptr); /* Colour map size */
putc(0,fptr); /* X origin */
putc(0,fptr);
putc(0,fptr); /* Y origin */
putc(0,fptr);
putc((nx & 0x00ff),fptr); /* X width */
putc((nx & 0xff00) / 256,fptr);
putc((ny & 0x00ff),fptr); /* Y width */
putc((ny & 0xff00) / 256,fptr);
if (ABS(format) == 11 || ABS(format) == 13) {
putc(32,fptr); /* 32 bit bitmap */
putc(0x08,fptr);
} else {
putc(24,fptr); /* 24 bit bitmap */
putc(0x00,fptr);
}
break;
case 2:
fprintf(fptr,"P6\n# bitmaplib (Paul Bourke)\n%d %d\n255\n",nx,ny);
break;
case 3:
putc(0x01,fptr);
putc(0xda,fptr);
putc(0x00,fptr);
putc(0x01,fptr);
putc(0x00,fptr);
putc(0x03,fptr);
putc((nx & 0xFF00) / 256,fptr);
putc((nx & 0x00FF),fptr);
putc((ny & 0xFF00) / 256,fptr);
putc((ny & 0x00FF),fptr);
BM_WriteHexString(fptr,"000300000000000000ff00000000");
fprintf(fptr,"WriteBitmap, pdb");
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
putc(0x00,fptr);
break;
case 4:
break;
case 5:
BM_WriteHexString(fptr,"4d4d002a"); /* Little endian & TIFF identifier */
offset = nx * ny * 3 + 8;
BM_WriteLongInt(fptr,buffer,offset);
break;
case 6:
fprintf(fptr,"%%!PS-Adobe-3.0 EPSF-3.0\n");
fprintf(fptr,"%%%%Creator: Created from bitmaplib by Paul Bourke\n");
fprintf(fptr,"%%%%BoundingBox: %d %d %d %d\n",0,0,nx,ny);
fprintf(fptr,"%%%%LanguageLevel: 2\n");
fprintf(fptr,"%%%%Pages: 1\n");
fprintf(fptr,"%%%%DocumentData: Clean7Bit\n");
fprintf(fptr,"%d %d scale\n",nx,ny);
fprintf(fptr,"%d %d 8 [%d 0 0 -%d 0 %d]\n",nx,ny,nx,ny,ny);
fprintf(fptr,"{currentfile 3 %d mul string readhexstring pop} bind\n",nx);
fprintf(fptr,"false 3 colorimage\n");
break;
case 7:
fprintf(fptr,"%%!PS-Adobe-3.0 EPSF-3.0\n");
fprintf(fptr,"%%%%Creator: Created from bitmaplib by Paul Bourke\n");
fprintf(fptr,"%%%%BoundingBox: %d %d %d %d\n",0,0,nx,ny);
fprintf(fptr,"%%%%LanguageLevel: 2\n");
fprintf(fptr,"%%%%Pages: 1\n");
fprintf(fptr,"%%%%DocumentData: Clean7Bit\n");
fprintf(fptr,"%d %d scale\n",nx,ny);
fprintf(fptr,"%d %d 8 [%d 0 0 -%d 0 %d]\n",nx,ny,nx,ny,ny);
fprintf(fptr,"{currentfile %d string readhexstring pop} bind\n",nx);
fprintf(fptr,"false 1 colorimage\n");
break;
case 8:
break;
case 9:
/* Header 10 bytes */
putc('B',fptr);
putc('M',fptr);
size = nx * ny * 3 + 14 + 40;
putc((size) % 256,fptr);
putc((size / 256) % 256,fptr);
putc((size / 65536) % 256,fptr);
putc((size / 16777216),fptr);
putc(0,fptr); putc(0,fptr);
putc(0,fptr); putc(0,fptr);
/* Offset to image data */
putc(14+40,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
/* Information header 40 bytes */
putc(0x28,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
putc((nx) % 256,fptr);
putc((nx / 256) % 256,fptr);
putc((nx / 65536) % 256,fptr);
putc((nx / 16777216),fptr);
putc((ny) % 256,fptr);
putc((ny / 256) % 256,fptr);
putc((ny / 65536) % 256,fptr);
putc((ny / 16777216),fptr);
putc(1,fptr); putc(0,fptr); /* One plane */
putc(24,fptr); putc(0,fptr); /* 24 bits */
/* Compression type == 0 */
putc(0,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
size = nx * ny * 3;
putc((size) % 256,fptr);
putc((size / 256) % 256,fptr);
putc((size / 65536) % 256,fptr);
putc((size / 16777216),fptr);
putc(1,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
putc(1,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
putc(0,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr); /* No palette */
putc(0,fptr); putc(0,fptr); putc(0,fptr); putc(0,fptr);
break;
}
// Write the binary data
for (j=0;j<ny;j++) {
if (format > 0)
rowindex = j * nx;
else
rowindex = (ny - 1 - j) * nx;
switch (ABS(format)) {
case 12:
WriteTGACompressedRow(fptr,&(bm[rowindex]),nx,3);
break;
case 13:
WriteTGACompressedRow(fptr,&(bm[rowindex]),nx,4);
break;
}
for (i=0;i<nx;i++) {
if (format > 0)
index = rowindex + i;
else
index = rowindex + i;
switch (ABS(format)) {
case 1:
case 11:
case 9:
putc(bm[index].b,fptr);
putc(bm[index].g,fptr);
putc(bm[index].r,fptr);
if (ABS(format) == 11)
putc(bm[index].a,fptr);
break;
case 2:
case 3:
case 5:
case 8:
putc(bm[index].r,fptr);
putc(bm[index].g,fptr);
putc(bm[index].b,fptr);
break;
case 4:
putc((bm[index].r+bm[index].g+bm[index].b)/3,fptr);
break;
case 6:
fprintf(fptr,"%02x%02x%02x",bm[index].r,bm[index].g,bm[index].b);
linelength += 6;
if (linelength >= 72 || linelength >= nx) {
fprintf(fptr,"\n");
linelength = 0;
}
break;
case 7:
fprintf(fptr,"%02x",(bm[index].r+bm[index].g+bm[index].b)/3);
linelength += 2;
if (linelength >= 72 || linelength >= nx) {
fprintf(fptr,"\n");
linelength = 0;
}
break;
}
}
}
/* Write the footer */
switch (ABS(format)) {
case 1:
case 11:
case 12:
case 13:
case 2:
case 3:
case 4:
break;
case 5:
putc(0x00,fptr); /* The number of directory entries (14) */
putc(0x0e,fptr);
/* Width tag, short int */
BM_WriteHexString(fptr,"0100000300000001");
putc((nx & 0xff00) / 256,fptr); /* Image width */
putc((nx & 0x00ff),fptr);
putc(0x00,fptr);
putc(0x00,fptr);
/* Height tag, short int */
BM_WriteHexString(fptr,"0101000300000001");
putc((ny & 0xff00) / 256,fptr); /* Image height */
putc((ny & 0x00ff),fptr);
putc(0x00,fptr);
putc(0x00,fptr);
/* bits per sample tag, short int */
BM_WriteHexString(fptr,"0102000300000003");
offset = nx * ny * 3 + 182;
BM_WriteLongInt(fptr,buffer,offset);
/* Compression flag, short int */
BM_WriteHexString(fptr,"010300030000000100010000");
/* Photometric interpolation tag, short int */
BM_WriteHexString(fptr,"010600030000000100020000");
/* Strip offset tag, long int */
BM_WriteHexString(fptr,"011100040000000100000008");
/* Orientation flag, short int */
BM_WriteHexString(fptr,"011200030000000100010000");
/* Sample per pixel tag, short int */
BM_WriteHexString(fptr,"011500030000000100030000");
/* Rows per strip tag, short int */
BM_WriteHexString(fptr,"0116000300000001");
putc((ny & 0xff00) / 256,fptr);
putc((ny & 0x00ff),fptr);
putc(0x00,fptr);
putc(0x00,fptr);
/* Strip byte count flag, long int */
BM_WriteHexString(fptr,"0117000400000001");
offset = nx * ny * 3;
BM_WriteLongInt(fptr,buffer,offset);
/* Minimum sample value flag, short int */
BM_WriteHexString(fptr,"0118000300000003");
offset = nx * ny * 3 + 188;
BM_WriteLongInt(fptr,buffer,offset);
/* Maximum sample value tag, short int */
BM_WriteHexString(fptr,"0119000300000003");
offset = nx * ny * 3 + 194;
BM_WriteLongInt(fptr,buffer,offset);
/* Planar configuration tag, short int */
BM_WriteHexString(fptr,"011c00030000000100010000");
/* Sample format tag, short int */
BM_WriteHexString(fptr,"0153000300000003");
offset = nx * ny * 3 + 200;
BM_WriteLongInt(fptr,buffer,offset);
/* End of the directory entry */
BM_WriteHexString(fptr,"00000000");
/* Bits for each colour channel */
BM_WriteHexString(fptr,"000800080008");
/* Minimum value for each component */
BM_WriteHexString(fptr,"000000000000");
/* Maximum value per channel */
BM_WriteHexString(fptr,"00ff00ff00ff");
/* Samples per pixel for each channel */
BM_WriteHexString(fptr,"000100010001");
break;
case 6:
case 7:
fprintf(fptr,"\n%%%%EOF\n");
break;
case 8:
case 9:
break;
}
}
/*
Write a compressed TGA row
Depth is either 3 or 4
*/
void WriteTGACompressedRow(FILE *fptr,BITMAP4 *bm,int width,int depth)
{
int i;
int counter = 1;
int pixelstart = 0;
int packettype = 0;
int readytowrite = FALSE;
BITMAP4 currentpixel,nextpixel = {0,0,0,0};
currentpixel = bm[0];
for (;;) {
if (pixelstart+counter >= width) // Added April to fix strange bug
readytowrite = TRUE;
else
nextpixel = bm[pixelstart+counter];
if (!readytowrite) {
if (Same_BitmapPixel(currentpixel,nextpixel)) {
if (packettype == 0) {
counter++;
if (counter >= 128 || (pixelstart + counter) >= width)
readytowrite = TRUE;
} else {
counter--;
readytowrite = TRUE;
}
} else {
if (packettype == 1 || counter <= 1) {
packettype = 1;
currentpixel = nextpixel;
counter++;
if (counter >= 128 || (pixelstart + counter) >= width)
readytowrite = TRUE;
} else {
readytowrite = TRUE;
}
}
}
if (readytowrite) {
if (pixelstart + counter > width)
counter = width - pixelstart;
if (packettype == 0) {
putc(((counter-1) | 0x80),fptr);
putc(currentpixel.b,fptr);
putc(currentpixel.g,fptr);
putc(currentpixel.r,fptr);
if (depth == 4)
putc(currentpixel.a,fptr);
currentpixel = nextpixel;
} else {
putc(counter-1,fptr);
for (i=0;i<counter;i++) {
putc(bm[pixelstart+i].b,fptr);
putc(bm[pixelstart+i].g,fptr);
putc(bm[pixelstart+i].r,fptr);
if (depth == 4)
putc(bm[pixelstart+i].a,fptr);
}
}
if ((pixelstart = pixelstart + counter) >= width)
break; /* From for (;;) */
readytowrite = FALSE;
packettype = 0;
counter = 1;
}
}
}
void BM_WriteLongInt(FILE *fptr,char *s,long n)
{
int i;
s[0] = (n & 0xff000000) / 16777216;
s[1] = (n & 0x00ff0000) / 65536;
s[2] = (n & 0x0000ff00) / 256;
s[3] = (n & 0x000000ff);
for (i=0;i<4;i++)
putc(s[i],fptr);
}
void BM_WriteHexString(FILE *fptr,char *s)
{
unsigned int i,c;
char hex[3];
for (i=0;i<strlen(s);i+=2) {
hex[0] = s[i];
hex[1] = s[i+1];
hex[2] = '\0';
sscanf(hex,"%X",&c);
putc(c,fptr);
}
}
/*
Clear the bitmap to a particular colour
*/
void Erase_Bitmap(BITMAP4 *bm, int nx, int ny, BITMAP4 col)
{
int i,j;
long index;
for (i=0;i<nx;i++) {
for (j=0;j<ny;j++) {
index = j * nx + i;
bm[index] = col;
}
}
}
/*
Scale an image using bicubic interpolation
*/
void BiCubicScale(
BITMAP4 *bm_in,int nx,int ny,
BITMAP4 *bm_out,int nnx,int nny)
{
int i_out,j_out,i_in,j_in,ii,jj;
int n,m;
long index;
double cx,cy,dx,dy,weight;
double red,green,blue,alpha;
BITMAP4 col;
for (i_out=0;i_out<nnx;i_out++) {
for (j_out=0;j_out<nny;j_out++) {
i_in = (i_out * nx) / nnx;
j_in = (j_out * ny) / nny;
cx = i_out * nx / (double)nnx;
cy = j_out * ny / (double)nny;
dx = cx - i_in;
dy = cy - j_in;
red = 0;
green = 0;
blue = 0;
alpha = 0;
for (m=-1;m<=2;m++) {
for (n=-1;n<=2;n++) {
ii = i_in + m;
jj = j_in + n;
if (ii < 0) ii = 0;
if (ii >= nx) ii = nx-1;
if (jj < 0) jj = 0;
if (jj >= ny) jj = ny-1;
index = jj * nx + ii;
weight = BiCubicR(m-dx) * BiCubicR(n-dy);
// weight = BiCubicR(m-dx) * BiCubicR(dy-n);
red += weight * bm_in[index].r;
green += weight * bm_in[index].g;
blue += weight * bm_in[index].b;
alpha += weight * bm_in[index].a;
}
}
col.r = (int)red;
col.g = (int)green;
col.b = (int)blue;
col.a = (int)alpha;
bm_out[j_out * nnx + i_out] = col;
}
}
}
double BiCubicR(double x)
{
double xp2,xp1,xm1;
double r = 0;
xp2 = x + 2;
xp1 = x + 1;
xm1 = x - 1;
if (xp2 > 0)
r += xp2 * xp2 * xp2;
if (xp1 > 0)
r -= 4 * xp1 * xp1 * xp1;
if (x > 0)
r += 6 * x * x * x;
if (xm1 > 0)
r -= 4 * xm1 * xm1 * xm1;
return(r / 6.0);
}
/*
Scale a bitmap
Apply a gaussian radial average if r > 0
r is in units of the input image
*/
void GaussianScale(
BITMAP4 *bm_in,int nx,int ny,
BITMAP4 *bm_out,int nnx,int nny,double r)
{
int i,j,ii,jj,ci,cj;
long index;
double x,y,cx,cy,red,green,blue,alpha,dist2,r2,weight,sum;
BITMAP4 col,black = {0,0,0,255};
r2 = r*r;
for (i=0;i<nnx;i++) {
for (j=0;j<nny;j++) {
col = black;
if (r2 <= 0) {
ci = (i * nx) / nnx;
cj = (j * ny) / nny;
index = cj * nx + ci;
col = bm_in[index];
} else {
cx = i * nx / (double)nnx;
cy = j * ny / (double)nny;
red = 0;
green = 0;
blue = 0;
alpha = 0;
sum = 0;
for (x=cx-4*r;x<=cx+4*r+0.01;x++) {
for (y=cy-4*r;y<=cy+4*r+0.01;y++) {
ii = (int)x;
jj = (int)y;
if (ii < 0)
ii = 0;
if (ii >= nx)
ii = nx-1;;
if (jj < 0)
jj = 0;
if (jj >= ny)
jj = ny-1;
dist2 = (cx-x)*(cx-x) + (cy-y)*(cy-y);
weight = exp(-0.5*dist2/r2) / (r2*TWOPI);
index = jj * nx + ii;
red += weight * bm_in[index].r;
green += weight * bm_in[index].g;
blue += weight * bm_in[index].b;
alpha += weight * bm_in[index].a;
sum += weight;
}
}
col.r = (int)red;
col.g = (int)green;
col.b = (int)blue;
col.a = (int)alpha;
}
bm_out[j * nnx + i] = col;
}
}
}
/*
Draw a marker, add new types at will
Centered at cx,cy of colour col, radius and type
*/
int Draw_Marker(BITMAP4 *bm,int nx,int ny,int cx,int cy,BITMAP4 col,int type,int radius)
{
int i,j;
int x,y;
double theta;
switch (type) {
case 0: // Cube
for (i=-radius;i<=radius;i++) {
for (j=-radius;j<=radius;j++) {
x = cx + i;
y = cy + j;
Draw_Pixel(bm,nx,ny,x,y,col);
}
}
break;
case 1: // Filled circle
for (i=-radius;i<=radius;i++) {
for (j=-radius;j<=radius;j++) {
if (sqrt(i*i+(double)j*j) > radius)
continue;
x = cx + i;
y = cy + j;
Draw_Pixel(bm,nx,ny,x,y,col);
}
}
break;
case 2: // Outline
for (i=0;i<=360;i++) { // better ways of doing this
theta = i * M_PI / 180;
x = cx + radius*cos(theta);
y = cy + radius*sin(theta);
Draw_Pixel(bm,nx,ny,x,y,col);
}
break;
}
return(TRUE);
}
/*
Turn on a pixel of a bitmap
*/
int Draw_Pixel(BITMAP4 *bm, int nx, int ny, int x, int y, BITMAP4 col)
{
long index;
if (x < 0 || y < 0 || x >= nx || y >= ny)
return(FALSE);
index = y * nx + x;
bm[index] = col;
return(TRUE);
}
/*
Fill a recatngle with a colour
Clipping done in Draw_Pixel()
*/
int Draw_Box(BITMAP4 *bm, int nx, int ny, int x1, int y1, int x2, int y2, BITMAP4 col)
{
int i,j;
for (i=x1;i<x2;i++)
for (j=y1;j<y2;j++)
Draw_Pixel(bm,nx,ny,i,j,col);
return(TRUE);
}
/*
Return the value of a pixel
*/
BITMAP4 Get_Pixel(BITMAP4 *bm, int nx, int ny, int x, int y)
{
long index;
BITMAP4 black = {0,0,0,255};
if (x < 0 || y < 0 || x >= nx || y >= ny)
return(black);
index = y * nx + x;
return(bm[index]);
}
/*
Draw a line from (x1,y1) to (x2,y2)
Use colour col
*/
void Draw_Line(BITMAP4 *bm,int nx,int ny,int x1,int y1,int x2,int y2,BITMAP4 col)
{
int i,j;
long index;
double mu,dx,dy,dxy;
dx = x2 - x1;
dy = y2 - y1;
dxy = sqrt(dx*dx + dy*dy);
if (dxy <= 0) {
Draw_Pixel(bm,nx,ny,x1,y1,col);
return;
}
for (mu=0;mu<=2*dxy;mu++) {
i = (int)(x1 + 0.5 * mu * dx / dxy);
j = (int)(y1 + 0.5 * mu * dy / dxy);
if (i < 0 || j < 0 || i >= nx || j >= ny)
continue;
index = j * nx + i;
bm[index] = col;
}
}
/*
Line with modifier
0 = none
1 = lighter
2 = darker
*/
void Draw_ModLine(BITMAP4 *bm,int nx,int ny,int x1,int y1,int x2,int y2,BITMAP4 col,int mod)
{
int i,j,ilast = -1,jlast = -1;
long index;
double mu,dx,dy,dxy;
BITMAP4 col1;
dx = x2 - x1;
dy = y2 - y1;
dxy = MAX(dx,dy);
if (dxy <= 0) {
Draw_Pixel(bm,nx,ny,x1,y1,col);
return;
}
for (mu=0;mu<=1;mu+=1/dxy) {
i = (int)(x1 + mu * dx);
j = (int)(y1 + mu * dy);
if (i == ilast && i == jlast)
break;
if (i < 0 || j < 0 || i >= nx || j >= ny)
continue;
index = j * nx + i;
col1 = bm[index]; // Existing colour
switch (mod) {
case 1: // Lighter
if (col1.r*col1.r + col1.g*col1.g + col1.b*col1.b <= col.r*col.r + col.g*col.g + col.b*col.b)
bm[index] = col;
break;
case 2: // Darker
if (col1.r*col1.r + col1.g*col1.g + col1.b*col1.b >= col.r*col.r + col.g*col.g + col.b*col.b)
bm[index] = col;
break;
case 0:
default:
bm[index] = col;
break;
}
ilast = i;
jlast = j;
}
}
/*
Scale a RGB value, dealing with clipping issues
*/
BITMAP4 Scale_Pixel(BITMAP4 pixelin,double scale)
{
BITMAP4 pixelout;
double r,g,b,a=0;
r = pixelin.r * scale;
g = pixelin.g * scale;
b = pixelin.b * scale;
a = pixelin.a * scale;
if (r < 000) r = 0;
if (r > 255) r = 255;
if (g < 000) g = 0;
if (g > 255) g = 255;
if (b < 000) b = 0;
if (b > 255) b = 255;
if (a < 000) a = 0;
if (a > 255) a = 255;
pixelout.r = (int)r;
pixelout.g = (int)g;
pixelout.b = (int)b;
pixelout.a = (int)a;
return(pixelout);
}
/*
Flip an image about an axis
mode == 1 for horizontal
mode == 0 for vertical
This library assumes the (0,0) coordinate is top left
*/
void Flip_Bitmap(BITMAP4 *image,int width,int height,int mode)
{
int i,j;
long index1,index2;
BITMAP4 p;
switch (mode) {
case 0:
for (j=0;j<height/2;j++) {
for (i=0;i<width;i++) {
index1 = j * width + i;
index2 = (height-1-j) * width + i;
p = image[index1];
image[index1] = image[index2];
image[index2] = p;
}
}
break;
case 1:
for (j=0;j<height;j++) {
for (i=0;i<width/2;i++) {
index1 = j * width + i;
index2 = j * width + (width-1-i);
p = image[index1];
image[index1] = image[index2];
image[index2] = p;
}
}
break;
}
}
int IsTGA(char *fname)
{
int i;
char s[256];
strcpy(s,fname);
for (i=0;i<strlen(s);i++)
if (s[i] >= 'A' && s[i] <= 'Z')
s[i] += ('a' - 'A');
if (strstr(s,".tga") != NULL)
return(TRUE);
if (strstr(s,".TGA") != NULL)
return(TRUE);
return(FALSE);
}
/*
Get the size and depth of a TGA file
*/
void TGA_Info(FILE *fptr,int *width,int *height,int *depth)
{
int lo,hi;
TGAHEADER header;
*width = 0;
*height = 0;
*depth = 0;
header.idlength = fgetc(fptr);
header.colourmaptype = fgetc(fptr);
header.datatypecode = fgetc(fptr);
if (fread(&header.colourmaporigin,2,1,fptr) != 1)
return;
if (fread(&header.colourmaplength,2,1,fptr) != 1)
return;
header.colourmapdepth = fgetc(fptr);
if (fread(&header.x_origin,2,1,fptr) != 1)
return;
if (fread(&header.y_origin,2,1,fptr) != 1)
return;
lo = fgetc(fptr);
hi = fgetc(fptr);
header.width = hi*256 + lo;
lo = fgetc(fptr);
hi = fgetc(fptr);
header.height = hi*256 + lo;
header.bitsperpixel = fgetc(fptr);
header.imagedescriptor = fgetc(fptr);
*width = header.width;
*height = header.height;
*depth = header.bitsperpixel;
rewind(fptr);
}
/*
Read the TGA image data
Return 0 on success
Error codes
1 - Failed to get legal colour type code
2 - Failed to get legal bits per pixel
3 - Failed to get legal colour map type
4 - Failed to read colour data
5 - Failed to read colour table
10 - fread failures
*/
int TGA_Read(FILE *fptr,BITMAP4 *image,int *width,int *height)
{
int n=0,i,j;
int lo,hi,index;
int bytes2read,skipover = 0;
TGAHEADER header;
unsigned char p[5];
BITMAP4 *ctable = NULL;
// Read the header
header.idlength = fgetc(fptr);
header.colourmaptype = fgetc(fptr);
header.datatypecode = fgetc(fptr);
lo = fgetc(fptr);
hi = fgetc(fptr);
header.colourmaporigin = hi*256 + lo;
lo = fgetc(fptr);
hi = fgetc(fptr);
header.colourmaplength = hi*256 + lo;
header.colourmapdepth = fgetc(fptr);
if (fread(&header.x_origin,2,1,fptr) != 1)
return(10);
if (fread(&header.y_origin,2,1,fptr) != 1)
return(10);
lo = fgetc(fptr);
hi = fgetc(fptr);
header.width = hi*256 + lo;
*width = header.width;
lo = fgetc(fptr);
hi = fgetc(fptr);
header.height = hi*256 + lo;
*height = header.height;
header.bitsperpixel = fgetc(fptr);
header.imagedescriptor = fgetc(fptr);
/*
Can only handle image type 1, 2, 3 and 10
1 - index colour uncompressed
2 - rgb uncompressed
10 - rgb rle comrpessed
3 - grey scale uncompressed
9 - rle index colour (unsupported)
11 - rle black and white
*/
if (header.datatypecode != 1 &&
header.datatypecode != 2 &&
header.datatypecode != 3 &&
header.datatypecode != 11 &&
header.datatypecode != 10) {
return(1);
}
/* Can only handle pixel depths of 8, 16, 24, and 32 */
if (header.bitsperpixel != 8 &&
header.bitsperpixel != 16 &&
header.bitsperpixel != 24 &&
header.bitsperpixel != 32) {
return(2);
}
/*
Can only handle colour map types of 0 and 1
Ignore the colour map case (1) for RGB images!
*/
if (header.colourmaptype != 0 && header.colourmaptype != 1) {
return(3);
}
/* Read the colour index table */
if (header.datatypecode == 1) {
ctable = (BITMAP4 *)malloc(header.colourmaplength*sizeof(BITMAP4));
bytes2read = header.colourmapdepth / 8;
for (i=0;i<header.colourmaplength;i++) {
if ((int)fread(p,1,bytes2read,fptr) != bytes2read)
return(5);
TGA_MergeBytes(&(ctable[i]),p,bytes2read);
}
}
/* Go to the start of the image data */
skipover = 18;
skipover += header.idlength;
skipover += header.colourmaptype * header.colourmaplength * header.colourmapdepth / 8;
fseek(fptr,skipover,SEEK_SET);
/* Read the image */
bytes2read = header.bitsperpixel / 8;
while (n < header.width * header.height) {
if (header.datatypecode == 1) { /* Indexed uncompressed */
if ((index = fgetc(fptr)) == EOF)
return(4);
if (index < 0)
index = 0;
if (index >= header.colourmaplength)
index = header.colourmaplength-1;