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CnC_Renegade/Code/wwlib/TARGA.CPP

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/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/****************************************************************************
*
* C O N F I D E N T I A L --- W E S T W O O D S T U D I O S
*
*----------------------------------------------------------------------------
*
* FILE
* targa.cpp
*
* DESCRIPTION
* Targa image file class.
*
* PROGRAMMER
* Denzil E. Long, Jr.
*
* DATE
* August 8, 1995
*
*----------------------------------------------------------------------------
*
* PUBLIC
* Open - Open Targa image file.
* Close - Close Targa image file.
* Load - Load Targa image file.
* Save - Save a Targa Image File.
* XFlip - X flip the image.
* YFlip - Y flip the image.
* SetImage - Set the image buffer.
* GetImage - Get the current image buffer address.
* SetPalette - Set the palette buffer.
* GetPalette - Retrieve the current palette buffer address.
* GetExtension - Get Extension data. (Targa 2.0 files only)
*
* PRIVATE
* DecodeImage - Decompress Targa image data.
* EncodeImage - Compress the image using targa RLE.
* InvertImage - Invert TrueColor image data.
*
* MODIFICATIONS:
* Converted to work with FileClass, FileFactory (changes are inside
* ifdefs, so can be easily reversed). Naty Hoffman, January 25, 2001
*
****************************************************************************/
#include "targa.h"
#ifndef TGA_USES_WWLIB_FILE_CLASSES
#include <stdio.h>
#endif
#include <malloc.h>
#include <memory.h>
#include <string.h>
#ifdef TGA_USES_WWLIB_FILE_CLASSES
#include "wwfile.h"
#include "ffactory.h"
#else
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>
#endif
/****************************************************************************
*
* NAME
* Targa::Targa - Initialize a Targa instance.
*
* SYNOPSIS
* Targa()
*
* void Targa(void);
*
* FUNCTION
* Initialize the targa class instance.
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
Targa::Targa(void)
{
mImage = NULL;
mPalette = NULL;
Clear_File();
mAccess = TGA_READMODE;
mFlags = 0;
memset(&Header, 0, sizeof(TGAHeader));
memset(&mExtension, 0, sizeof(TGA2Extension));
}
/****************************************************************************
*
* NAME
* Targa::~Targa - Targa class destructor.
*
* SYNOPSIS
* ~Targa()
*
* void ~Targa(void);
*
* FUNCTION
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
Targa::~Targa(void)
{
/* Close the file if has been left open. */
Close();
/* Free the palette buffer if we allocated it. */
if ((mPalette != NULL) && (mFlags & TGAF_PAL))
free(mPalette);
/* Free the image buffer if we allocated it. */
if ((mImage != NULL) && (mFlags & TGAF_IMAGE))
free(mImage);
}
/****************************************************************************
*
* NAME
* Targa::Open - Open Targa image file.
*
* SYNOPSIS
* Error = Open(Name, Mode)
*
* long Open(char *, long);
*
* FUNCTION
* Open a Targa image file and read in its header. The file stream will
* positioned after the ID field (if there is one).
*
* INPUTS
* Name - Pointer to name of Targa file.
* Mode - Access mode.
*
* RESULT
* Error - Error code, 0 if okay.
*
****************************************************************************/
long Targa::Open(const char* name, long mode)
{
TGA2Footer footer;
long size;
long error = 0;
/* File already open? */
if (Is_File_Open() && (mAccess == mode)) {
return (0);
}
Close();
/* Initialize the access mode. */
mAccess = mode;
mFlags &= ~TGAF_TGA2;
switch (mode) {
/* Open targa file for read. */
case TGA_READMODE:
if (File_Open_Read(name)) {
/* Check for 2.0 targa file by loading the footer */
if (File_Seek(-26, SEEK_END) == -1) {
error = TGAERR_READ;
}
if (!error) {
if (File_Read(&footer, sizeof(TGA2Footer)) != sizeof(TGA2Footer)) {
error = TGAERR_READ;
} else {
/* If this a 2.0 file with an extension? */
if (strncmp(footer.Signature, TGA2_SIGNATURE, 16) == 0) {
if (footer.Extension != 0) {
mFlags |= TGAF_TGA2;
}
}
}
}
/* Read in Extension data */
if (!error && (mFlags & TGAF_TGA2)) {
if (File_Seek(footer.Extension, SEEK_SET) == -1) {
error = TGAERR_READ;
}
if (!error) {
if (File_Read(&mExtension, sizeof(TGA2Extension)) != sizeof(TGA2Extension)) {
error = TGAERR_READ;
}
}
}
/* Read in header. */
if (!error && (File_Seek(0, SEEK_SET) == -1)) {
error = TGAERR_READ;
} else {
size = File_Read(&Header, sizeof(TGAHeader));
if (size != sizeof(TGAHeader)) {
error = TGAERR_READ;
}
}
/* Skip the ID field */
if (!error && (Header.IDLength != 0)) {
if (File_Seek(Header.IDLength, SEEK_CUR) == -1) {
error = TGAERR_READ;
}
}
} else {
error = TGAERR_OPEN;
}
break;
/* Open targa file for write. */
case TGA_WRITEMODE:
if (!File_Open_Write(name)) {
error = TGAERR_OPEN;
} else {
// printf("\r");
}
break;
/* Open targa file for read/write.*/
case TGA_RDWRMODE:
if (File_Open_ReadWrite(name)) {
/* Read in header. */
size = File_Read(&Header, sizeof(TGAHeader));
if (size != sizeof(TGAHeader)) {
error = TGAERR_READ;
}
/* Skip the ID field */
if (!error && (Header.IDLength != 0)) {
if (File_Seek(Header.IDLength, SEEK_CUR) == -1) {
error = TGAERR_READ;
}
}
} else {
error = TGAERR_OPEN;
}
break;
}
/* Close on any error! */
if (error) {
Close();
}
return (error);
}
/****************************************************************************
*
* NAME
* Targa::Close - Close Targa image file.
*
* SYNOPSIS
* Close()
*
* void Close(void);
*
* FUNCTION
* Close the Targa image file and free its handle.
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
void Targa::Close(void)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
if (TGAFile) {
TGAFile->Close();
_TheFileFactory->Return_File(TGAFile);
TGAFile = NULL;
}
#else
/* Close the file if it is open. */
if (mFH != -1) {
close(mFH);
mFH = -1;
}
#endif
}
/****************************************************************************
*
* NAME
* Targa::Load - Load Targa Image File into specified buffers.
*
* SYNOPSIS
* Error = Load(Name, Palette, ImageBuffer)
*
* long Load(char *, char *, char *);
*
* FUNCTION
* Open and load the Targa into the specified buffers. If either buffer
* pointer is NULL then that field will not be processed.
*
* INPUTS
* Name - Name of Targa image file to load.
* Palette - Pointer to buffer to load the palette into.
* ImageBuffer - Pointer to buffer to load the image data into.
*
* RESULT
* Error - 0 if successful, or TGAERR_??? error code.
*
****************************************************************************/
long Targa::Load(const char* name, char* palette, char* image,bool invert_image)
{
long size;
long depth;
long error = 0;
/* Open the Targa */
if (Open(name, TGA_READMODE) == NULL) {
/* Process ColorMap (palette) */
if (Header.ColorMapType == 1) {
depth = (Header.CMapDepth >> 3);
size = (Header.CMapLength * depth);
/* Load the palette from the TGA if a palette buffer is provided
* otherwise we will skip it.
*/
if ((palette != NULL) && (Header.CMapLength > 0)) {
/* Adjust palette to the starting color entry. */
palette += (Header.CMapStart * depth);
/* Read in the palette. */
if (File_Read(palette, size) != size) {
error = TGAERR_READ;
}
} else {
if (File_Seek(size, SEEK_CUR) == -1) {
error = TGAERR_READ;
}
}
}
/* Load the image data from the TGA if an image buffer is provided
* otherwise we are done.
*/
if (!error && (image != NULL)) {
depth = TGA_BytesPerPixel(Header.PixelDepth);
size = ((Header.Width * Header.Height) * depth);
switch (Header.ImageType) {
case TGA_CMAPPED:
if (File_Read(image, size) != size) {
error = TGAERR_READ;
}
break;
case TGA_TRUECOLOR:
if (File_Read(image, size) == size) {
if (invert_image) InvertImage();
} else {
error = TGAERR_READ;
}
break;
case TGA_MONO:
if (File_Read(image, size) != size) {
error = TGAERR_READ;
}
break;
case TGA_CMAPPED_ENCODED:
error = DecodeImage();
break;
case TGA_TRUECOLOR_ENCODED:
if ((error = DecodeImage()) == NULL) {
if (invert_image) InvertImage();
}
break;
default:
error = TGAERR_NOTSUPPORTED;
break;
}
/* Arrange the image so that the origin position (coordinate 0,0)
* is the upperleft hand corner of the image.
*/
if (!error) {
if ( Header.ImageDescriptor & TGAIDF_XORIGIN ) {
XFlip();
Header.ImageDescriptor &= ~TGAIDF_XORIGIN;
}
// Mod (IML) : Locate the origin at the bottom-left corner instead. This
// will make ot consistent with .TGA's that have been generated with our
// existing software.
// if (( Header.ImageDescriptor & TGAIDF_YORIGIN ) == 0){
if ( Header.ImageDescriptor & TGAIDF_YORIGIN ) {
YFlip();
// Bug fix (IML) : Clear this flag to indicate to the targa reader
// that the Y-origin is at the bottom of the image.
Header.ImageDescriptor &= ~TGAIDF_YORIGIN;
}
}
}
/* Close the Targa */
Close();
} else {
error = TGAERR_OPEN;
}
return (error);
}
/****************************************************************************
*
* NAME
* Targa::Load - Load Targa Image File. (Auto buffer allocation).
*
* SYNOPSIS
* Error = Load(Name, Flags)
*
* long Load(char, long);
*
* FUNCTION
* Open and load the Targa into buffers allocated by this function.
*
* INPUTS
* Name - Name of Targa image file to load.
* Flags -
*
* RESULT
* Error - 0 if successful, or TGAERR_??? error code.
*
****************************************************************************/
long Targa::Load(const char* name, long flags, bool invert_image)
{
long size;
long error = 0;
/* Open the file to get the header. */
if (Open(name, TGA_READMODE) == 0) {
/* Allocate palette memory if requested to and the targa has one. */
if ((flags & TGAF_PAL) && (Header.ColorMapType == 1)) {
/* Dispose of any previous palette. */
if ((mPalette != NULL) && (mFlags & TGAF_PAL)) {
free(mPalette);
mPalette = NULL;
mFlags &= ~TGAF_PAL;
}
/* Only allocate a palette if the client hasn't assigned one. */
if ((mPalette == NULL) && !(mFlags & TGAF_PAL)) {
/* Compute the size of the palette from the targa header. */
size = (Header.CMapLength * (Header.CMapDepth >> 3));
if (size != 0) {
/* Allocate memory for the palette. */
if ((mPalette = (char *)malloc(size)) != NULL) {
mFlags |= TGAF_PAL; /* We allocated the palette. */
} else {
error = TGAERR_NOMEM;
}
}
}
}
/* Allocate image memory if requested to. */
if (!error && (flags & TGAF_IMAGE)) {
/* Dispose of any previous image. */
if ((mImage != NULL) && (mFlags & TGAF_IMAGE)) {
free(mImage);
mImage = NULL;
mFlags &= ~TGAF_IMAGE;
}
/* Only allocate an image if the client hasn't assigned one. */
if ((mImage == NULL) && !(mFlags & TGAF_IMAGE)) {
/* Compute the size of the image data from the targa header. */
size = ((Header.Width * Header.Height) * TGA_BytesPerPixel(Header.PixelDepth));
if (size != 0) {
/* Allocate memory for the image. */
if ((mImage = (char *)malloc(size)) != NULL) {
mFlags |= TGAF_IMAGE; /* We allocated the image. */
} else {
error = TGAERR_NOMEM;
}
}
}
}
/* Read in the file contents. */
if (!error) {
error = Load(name, mPalette, mImage, invert_image);
}
/* Close the file. */
Close();
} else {
error = TGAERR_OPEN;
}
return (error);
}
/****************************************************************************
*
* NAME
* Targa::Save - Save a Targa Image File.
*
* SYNOPSIS
* Error = Save(Name, Flags)
*
* long Save(char *, long);
*
* FUNCTION
*
* INPUTS
* Name - Pointer to name of file to save.
* Flags -
*
* RESULT
* Error - 0 if successful, or TGAERR_??? error code.
*
****************************************************************************/
long Targa::Save(const char* name, long flags, bool addextension)
{
long size;
long depth;
char *palette;
char *temppal;
char *ptr;
//long i,n;
//char c;
long error = 0;
TGA2Footer footer;
/* Open the Targa for write. */
if (Open(name, TGA_WRITEMODE) == NULL)
{
Header.IDLength = 0;
/* Set the ImageType for compression. */
if (flags & TGAF_COMPRESS)
{
switch (Header.ImageType)
{
case TGA_CMAPPED:
case TGA_TRUECOLOR:
case TGA_MONO:
Header.ImageType += 8;
break;
case TGA_CMAPPED_ENCODED:
case TGA_TRUECOLOR_ENCODED:
case TGA_MONO_ENCODED:
break;
/* Turn off compression for unknown types. */
default:
flags &= ~TGAF_COMPRESS;
break;
}
}
/*-----------------------------------------------------------------------
* WRITE THE HEADER DATA SECTION
*---------------------------------------------------------------------*/
if (File_Write(&Header, sizeof(TGAHeader)) != sizeof(TGAHeader))
error = TGAERR_WRITE;
/*-----------------------------------------------------------------------
* WRITE THE COLORMAP (PALETTE) DATA SECTION
*---------------------------------------------------------------------*/
if (!error && (flags & TGAF_PAL) && (mPalette != NULL)
&& (Header.CMapLength > 0))
{
/* Adjust palette to the starting color entry. */
depth = (Header.CMapDepth >> 3);
palette = mPalette + (Header.CMapStart * depth);
size = (Header.CMapLength * depth);
/* Allocate temporary buffer for palette manipulation. */
if ((temppal = (char *)malloc(size)) != NULL)
{
memcpy(temppal, palette, size);
ptr = temppal;
#if(0)
/* Swap the byte ordering of the palette entries. */
for (i = 0; i < Header.CMapLength; i++)
{
c = *ptr;
*ptr = *(ptr + (depth - 1));
*(ptr + (depth - 1)) = c;
/* Next entry */
palette += depth;
}
#endif
/* Write the palette. */
if (File_Write(temppal, size) != size)
error = TGAERR_WRITE;
/* Free temporary palette buffer. */
free(temppal);
}
else
error = TGAERR_NOMEM;
}
/*-----------------------------------------------------------------------
* WRITE THE IMAGE DATA SECTION
*---------------------------------------------------------------------*/
if (!error && (flags & TGAF_IMAGE) && (mImage != NULL))
{
bool imageinverted;
/* Invert truecolor data. */
if ((Header.ImageType == TGA_TRUECOLOR) || (Header.ImageType == TGA_TRUECOLOR_ENCODED)) {
InvertImage();
imageinverted = true;
} else {
imageinverted = false;
}
/* Write the image. */
if (flags & TGAF_COMPRESS)
EncodeImage();
else
{
depth = TGA_BytesPerPixel(Header.PixelDepth);
size = (((Header.Width * Header.Height)) * depth);
if (File_Write(mImage, size) != size)
error = TGAERR_WRITE;
}
// Bug fix (IML) : If the image was inverted, invert it again to restore it to its prior state.
if (imageinverted) InvertImage();
}
/*-----------------------------------------------------------------------
* WRITE THE EXTENSION DATA SECTION
*---------------------------------------------------------------------*/
// Mod (IML) Optionally add an extension to the file.
if (addextension) {
if (!error) {
mExtension.ExtSize = 495;
strncpy(mExtension.SoftID, "Denzil's Targa Code", 41);
mExtension.SoftVer.Number = (1 * 100);
mExtension.SoftVer.Letter = 0;
/* Save position of extension area. */
if ((footer.Extension = File_Seek(0, SEEK_CUR)) == -1)
error = TGAERR_WRITE;
if (!error && (File_Write(&mExtension, sizeof(TGA2Extension))
!= sizeof(TGA2Extension)))
error = TGAERR_WRITE;
}
} else {
footer.Extension = 0;
}
/*-----------------------------------------------------------------------
* WRITE THE FOOTER DATA SECTION
*---------------------------------------------------------------------*/
if (!error)
{
footer.Developer = 0;
strncpy(footer.Signature, TGA2_SIGNATURE, 16);
footer.RsvdChar = '.';
footer.BZST = 0;
if (File_Write(&footer, sizeof(TGA2Footer)) != sizeof(TGA2Footer))
error = TGAERR_WRITE;
}
/* Close targa file. */
Close();
}
else
error = TGAERR_OPEN;
return (error);
}
/****************************************************************************
*
* NAME
* Targa::XFlip - X flip the image.
*
* SYNOPSIS
* XFlip()
*
* void XFlip();
*
* FUNCTION
* Flip the image in memory on its X axis. (left to right)
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
void Targa::XFlip(void)
{
char *ptr,*ptr1;
long x,y,d;
char v,v1;
char depth;
/* Pixel depth in bytes. */
depth = TGA_BytesPerPixel(Header.PixelDepth);
for (y = 0; y < Header.Height; y++)
{
ptr = (mImage + ((Header.Width * depth) * y));
ptr1 = (ptr + ((Header.Width * depth) - depth));
for (x = 0; x < (Header.Width / 2); x++)
{
for (d = 0; d < depth; d++)
{
v = *(ptr + d);
v1 = *(ptr1 + d);
*(ptr + d) = v1;
*(ptr1 + d) = v;
}
ptr += depth;
ptr1 -= depth;
}
}
}
/****************************************************************************
*
* NAME
* Targa::YFlip - Y flip the image.
*
* SYNOPSIS
* YFlip()
*
* void YFlip();
*
* FUNCTION
* Flip the image in memory on its Y axis. (top to bottom)
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
void Targa::YFlip(void)
{
char *ptr,*ptr1;
long x,y;
char v,v1;
char depth;
/* Pixel depth in bytes. */
depth = TGA_BytesPerPixel(Header.PixelDepth);
for (y = 0; y < (Header.Height >> 1); y++)
{
/* Compute address of lines to exchange. */
ptr = (mImage + ((Header.Width * y) * depth));
ptr1 = (mImage + ((Header.Width * (Header.Height - 1)) * depth));
ptr1 -= ((Header.Width * y) * depth);
/* Exchange all the pixels on this scan line. */
for (x = 0; x < (Header.Width * depth); x++)
{
v = *ptr;
v1 = *ptr1;
*ptr = v1;
*ptr1 = v;
ptr++;
ptr1++;
}
}
}
/****************************************************************************
*
* NAME
* Targa::SetImage - Set the image buffer.
*
* SYNOPSIS
* OldImage = SetImage(Image)
*
* char *SetImage(char *);
*
* FUNCTION
* Set the image buffer to one provided by the caller.
*
* INPUTS
* Image - Pointer to buffer to use for the image buffer.
*
* RESULT
* OldImage - Previous caller assigned image buffer.
*
****************************************************************************/
char *Targa::SetImage(char *buffer)
{
char *oldbuffer = NULL;
/* Free any image buffer before assigning another. */
if ((mImage != NULL) && (mFlags & TGAF_IMAGE))
{
free(mImage);
mImage = NULL;
mFlags &= ~TGAF_IMAGE;
}
/* Get the old user buffer. */
if (mImage != NULL)
oldbuffer = mImage;
/* Assign the new image buffer. */
mImage = buffer;
return (oldbuffer);
}
/****************************************************************************
*
* NAME
* Targa::SetPalette - Set the palette buffer.
*
* SYNOPSIS
* OldPal = SetPalette(Pal)
*
* char *SetPalette(char *);
*
* FUNCTION
*
* INPUTS
* Pal - Pointer to buffer to use for palette.
*
* RESULT
* OldPal - Pointer to previous user palette.
*
****************************************************************************/
char *Targa::SetPalette(char *buffer)
{
char *oldbuffer = NULL;
/* Free any image buffer before assigning another. */
if ((mPalette != NULL) && (mFlags & TGAF_PAL))
{
free(mPalette);
mPalette = NULL;
mFlags &= ~TGAF_PAL;
}
/* Get the old user buffer. */
if (mPalette != NULL)
oldbuffer = mPalette;
/* Assign the new image buffer. */
mPalette = buffer;
return (oldbuffer);
}
bool Targa::IsCompressed(void)
{
if (Header.ImageType > 8)
return true;
return false;
}
/****************************************************************************
*
* NAME
* Targa::GetExtension - Get Extension data. (Targa 2.0 files only)
*
* SYNOPSIS
* Ext = GetExtension()
*
* TGA2Extension *GetExtension(void);
*
* FUNCTION
* Retrieve a pointer to the Targa 2.0 extension data area. If the file
* version is 1.0 OR there is no extensio area then a NULL will be returned.
*
* INPUTS
* NONE
*
* RESULT
* Ext - Pointer to Extension data, NULL if not available.
*
****************************************************************************/
TGA2Extension *Targa::GetExtension(void)
{
if (mFlags & TGAF_TGA2)
return (&mExtension);
return (NULL);
}
/****************************************************************************
*
* NAME
* Targa::DecodeImage - Decompress Targa image data.
*
* SYNOPSIS
* Error = DecodeImage()
*
* long DecodeImage();
*
* FUNCTION
* Decode the RLE compressed image data into the specified buffer from
* the file I/O stream.
*
* INPUTS
* NONE
*
* RESULT
* Error - 0 if successful, or TGAERR_??? error code.
*
****************************************************************************/
long Targa::DecodeImage()
{
char *image;
char *color;
unsigned char count;
unsigned char depth;
unsigned long pixel_count;
unsigned long size;
unsigned long c,i;
long error = 0;
/* Initialize */
image = mImage;
/* Compute pixel depth in bytes. */
depth = TGA_BytesPerPixel(Header.PixelDepth);
/* Total number of pixels compressed in this image. */
pixel_count = (Header.Width * Header.Height);
while ((pixel_count > 0) && !error)
{
/* Read count. */
if (File_Read(&count, 1) == 1)
{
/* If bit 8 of the count is set then we have a run of pixels,
* otherwise the data is raw pixels.
*/
if (count & 0x80)
{
count &= 0x7F;
count++;
/* Read in run pixel. */
if (File_Read(image, depth) == depth)
{
color = image;
image += depth;
/* Repeat the pixel for the run count in the image buffer. */
for (c = 1; c < count; c++)
for (i = 0; i < depth; i++)
*image++ = *(color + i);
}
else
error = TGAERR_READ;
}
else
{
count++;
size = (count * depth);
/* Read in raw pixels. */
if ((unsigned)File_Read(image, size) == size)
image += size;
else
error = TGAERR_READ;
}
/* Adjust the pixel count. */
pixel_count -= count;
}
else
error = TGAERR_READ;
}
return (error);
}
/****************************************************************************
*
* NAME
* Targa::EncodeImage - Compress the image using targa RLE.
*
* SYNOPSIS
* EncodeImage()
*
* void EncodeImage(void);
*
* FUNCTION
* Encode the image data using the RLE algorithm outlined in the TARGA
* file specification.
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
long Targa::EncodeImage()
{
char *packet;
long packet_index;
char *start;
char *end;
long depth;
long pixels;
long count;
long match;
long i;
long error = 0;
/* Initialize variables. */
depth = TGA_BytesPerPixel(Header.PixelDepth);
/* Allocate packet buffer to hold maximum encoded data run. */
if ((packet = (char *)malloc(128 * depth)) != NULL)
{
pixels = Header.Width * Header.Height;
start = mImage;
end = start;
count = 0;
packet[0] = 0;
packet_index = 1;
while ((pixels != 0) && !error)
{
match = 1;
/* Advance to the next pixel */
end += depth;
pixels--;
/* Compare pixels. */
for (i = 0; i < depth; i++)
{
if (start[i] != end[i])
{
match = 0;
break;
}
}
/* Run of pixels */
if (match == 1)
{
count++;
/* Continue counting until the maximum has been reached. */
if (count < 128)
{
if (packet[0] == 0)
continue;
}
else
count--;
}
/* If there is a count then write out the run. Otherwise, write
* the raw pixel to the packet.
*/
if ((count != 0) && (packet[0] == 0))
{
/* Run count */
packet[0] = (count | 0x80);
/* Run pixel */
for (i = 0; i < depth; i++)
packet[i + 1] = start[i];
/* Write the run packet. */
if (File_Write(packet, (depth + 1)) != (depth + 1))
error = TGAERR_WRITE;
/* Reposition start and reset. */
start = end;
count = 0;
packet[0] = 0;
}
else
{
if (count == 0)
{
/* Copy the raw pixel to the packet. */
for (i = 0; i < depth; i++)
packet[packet_index + i] = start[i];
/* Increment the raw packet count. */
packet[0]++;
/* Reposition start */
start = end;
packet_index += depth;
}
/* Write the raw packet if the packet is full or a run has started
* or all the pixels have been processed.
*/
if ((packet[0] == 127) || (count != 0) || (pixels == 0))
{
i = packet[0];
packet[0]--;
if (File_Write(packet, ((i * depth) + 1)) != ((i * depth) + 1))
error = TGAERR_WRITE;
packet_index = 1;
packet[0] = 0;
}
}
}
/* Free the packet buffer. */
free(packet);
}
else
error = TGAERR_NOMEM;
return (error);
}
/****************************************************************************
*
* NAME
* Targa::InvertImage - Invert TrueColor image data.
*
* SYNOPSIS
* InvertImage()
*
* void InvertImage(void);
*
* FUNCTION
*
* INPUTS
* NONE
*
* RESULT
* NONE
*
****************************************************************************/
void Targa::InvertImage(void)
{
char *buffer;
long depth;
long pixel_count;
long i;
char c;
/* Initialize */
buffer = mImage;
/* Compute the pixel depth in bytes. */
depth = TGA_BytesPerPixel(Header.PixelDepth);
/* Total number of pixels in this image. */
pixel_count = (Header.Width * Header.Height);
/* 16-bit pixel layout is different that 24-bit and 32-bit. */
if (depth > 2)
{
while (pixel_count > 0)
{
for (i = 0; i < (depth / 2); i++)
{
c = *(buffer + i);
*(buffer + i) = *(buffer + ((depth - 1) - i));
*(buffer + ((depth - 1) - i)) = c;
}
/* Next pixel */
pixel_count--;
buffer += depth;
}
}
}
/*
** These functions are just for ease of ifdef'ing between standard io calls and FileClass.
*/
void Targa::Clear_File(void)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
TGAFile = NULL;
#else
mFH = -1;
#endif
}
bool Targa::Is_File_Open(void)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
return (TGAFile != NULL);
#else
return (mFH != -1);
#endif
}
bool Targa::File_Open_Read(const char* name)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
TGAFile = _TheFileFactory->Get_File(name);
if (TGAFile && TGAFile->Is_Available()) {
return (TGAFile->Open(FileClass::READ) != 0);
} else {
return false;
}
#else
mFH = open(name, (O_RDONLY|O_BINARY));
return (mFH != -1);
#endif
}
bool Targa::File_Open_Write(const char* name)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
TGAFile = _TheWritingFileFactory->Get_File(name);
if (TGAFile) {
return (TGAFile->Open(FileClass::WRITE) != 0);
} else {
return false;
}
#else
mFH = open(name, (O_CREAT|O_TRUNC|O_WRONLY|O_BINARY), (S_IREAD|S_IWRITE));
return (mFH != -1);
#endif
}
bool Targa::File_Open_ReadWrite(const char* name)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
TGAFile = _TheWritingFileFactory->Get_File(name);
if (TGAFile && TGAFile->Is_Available()) {
return (TGAFile->Open(FileClass::READ|FileClass::WRITE) != 0);
} else {
return false;
}
#else
mFH = open(name, (O_RDWR|O_BINARY), (S_IREAD|S_IWRITE));
return (mFH != -1);
#endif
}
int Targa::File_Seek(int pos, int dir)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
return TGAFile->Seek(pos, dir);
#else
return lseek(mFH, pos, dir);
#endif
}
int Targa::File_Read(void *buffer, int size)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
return TGAFile->Read(buffer, size);
#else
return read(mFH, buffer, size);
#endif
}
int Targa::File_Write(void *buffer, int size)
{
#ifdef TGA_USES_WWLIB_FILE_CLASSES
return TGAFile->Write(buffer, size);
#else
return write(mFH, buffer, size);
#endif
}
// ----------------------------------------------------------------------------
//
// Output targa load error message.
//
// ----------------------------------------------------------------------------
long Targa_Error_Handler(long load_err,const char* filename)
{
switch (load_err) {
case 0:
return 0;
case TGAERR_OPEN:
WWDEBUG_SAY(("Targa: Failed to open file \"%s\"\n", filename));
break;
case TGAERR_READ:
WWDEBUG_SAY(("Targa: Failed to read file \"%s\"\n", filename));
break;
case TGAERR_NOTSUPPORTED:
WWDEBUG_SAY(("Targa: File \"%s\" is an unsupported Targa type\n", filename));
break;
case TGAERR_NOMEM:
WWDEBUG_SAY(("Targa: Failed to allocate memory for file \"%s\"\n", filename));
break;
default:
WWDEBUG_SAY(("Targa: Unknown error when loading file \"%s\"\n", filename));
break;
}
return load_err;
}
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