/*
LoadTGA
*/
byte *
LoadTGA (QFile *fin)
{
int columns, rows, numPixels;
byte *pixbuf;
int row, column;
unsigned char red = 0, green = 0, blue = 0, alphabyte = 0;
TargaHeader targa_header;
byte *targa_rgba;
targa_header.id_length = Qgetc (fin);
targa_header.colormap_type = Qgetc (fin);
targa_header.image_type = Qgetc (fin);
targa_header.colormap_index = fgetLittleShort (fin);
targa_header.colormap_length = fgetLittleShort (fin);
targa_header.colormap_size = Qgetc (fin);
targa_header.x_origin = fgetLittleShort (fin);
targa_header.y_origin = fgetLittleShort (fin);
targa_header.width = fgetLittleShort (fin);
targa_header.height = fgetLittleShort (fin);
targa_header.pixel_size = Qgetc (fin);
targa_header.attributes = Qgetc (fin);
if (targa_header.image_type != 2 && targa_header.image_type != 10)
Sys_Error ("LoadTGA: Only type 2 and 10 targa RGB images supported\n");
if (targa_header.colormap_type != 0
|| (targa_header.pixel_size != 32 && targa_header.pixel_size != 24))
Sys_Error
("Texture_LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
columns = targa_header.width;
rows = targa_header.height;
numPixels = columns * rows;
targa_rgba = malloc (numPixels * 4);
if (targa_header.id_length != 0)
Qseek (fin, targa_header.id_length, SEEK_CUR); // skip TARGA image
// comment
if (targa_header.image_type == 2) { // Uncompressed, RGB images
for (row = rows - 1; row >= 0; row--) {
pixbuf = targa_rgba + row * columns * 4;
for (column = 0; column < columns; column++) {
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
}
}
} else if (targa_header.image_type == 10) { // Runlength encoded RGB
// images
unsigned char packetHeader, packetSize, j;
for (row = rows - 1; row >= 0; row--) {
pixbuf = targa_rgba + row * columns * 4;
for (column = 0; column < columns;) {
packetHeader = Qgetc (fin);
packetSize = 1 + (packetHeader & 0x7f);
if (packetHeader & 0x80) { // run-length packet
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
break;
}
for (j = 0; j < packetSize; j++) {
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
column++;
if (column == columns) { // run spans across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row * columns * 4;
}
}
} else { // non run-length packet
for (j = 0; j < packetSize; j++) {
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
column++;
if (column == columns) { // pixel packet run spans
// across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row * columns * 4;
}
}
}
}
breakOut:;
}
}
Qclose (fin);
return targa_rgba;
}
/*
=============
LoadTGA
=============
*/
void LoadTGA (FILE *fin)
{
int columns, rows, numPixels;
byte *pixbuf;
int row, column;
targa_header.id_length = fgetc(fin);
targa_header.colormap_type = fgetc(fin);
targa_header.image_type = fgetc(fin);
targa_header.colormap_index = fgetLittleShort(fin);
targa_header.colormap_length = fgetLittleShort(fin);
targa_header.colormap_size = fgetc(fin);
targa_header.x_origin = fgetLittleShort(fin);
targa_header.y_origin = fgetLittleShort(fin);
targa_header.width = fgetLittleShort(fin);
targa_header.height = fgetLittleShort(fin);
targa_header.pixel_size = fgetc(fin);
targa_header.attributes = fgetc(fin);
if (targa_header.image_type != 2 && targa_header.image_type != 10)
Sys_Error ("%s: Only type 2 and 10 targa RGB images supported", __thisfunc__);
if ((targa_header.pixel_size != 32 && targa_header.pixel_size != 24) ||
targa_header.colormap_type !=0)
Sys_Error ("%s: Only 32 or 24 bit images supported (no colormaps)", __thisfunc__);
columns = targa_header.width;
rows = targa_header.height;
numPixels = columns * rows;
targa_rgba = Hunk_AllocName(numPixels * 4, "tgafile_data");
if (targa_header.id_length != 0) // skip TARGA image comment
fseek(fin, targa_header.id_length, SEEK_CUR);
if (targa_header.image_type == 2)
{
// Uncompressed, RGB images
for (row = rows-1; row >= 0; row--)
{
pixbuf = targa_rgba + row*columns*4;
for (column = 0; column < columns; column++)
{
unsigned char red, green, blue, alphabyte;
switch (targa_header.pixel_size)
{
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
}
}
}
else if (targa_header.image_type == 10)
{
// Runlength encoded RGB images
unsigned char red, green, blue, alphabyte;
unsigned char packetHeader, packetSize, j;
for (row = rows-1; row >= 0; row--)
{
pixbuf = targa_rgba + row*columns*4;
for (column = 0 ; column < columns ; )
{
packetHeader = getc(fin);
packetSize = 1 + (packetHeader & 0x7f);
if (packetHeader & 0x80)
{ // run-length packet
switch (targa_header.pixel_size)
{
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
break;
}
for (j = 0; j < packetSize; j++)
{
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
column++;
if (column == columns)
{ // run spans across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
else
{ // non run-length packet
for (j = 0; j < packetSize; j++)
{
switch (targa_header.pixel_size)
{
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
column++;
if (column == columns)
{ // pixel packet run spans across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
}
breakOut:;
}
}
fclose(fin);
}
