/*****************************************************************************
gif2rgb - convert GIF to 24-bit RGB pixel triples or vice-versa
*****************************************************************************/
/***************************************************************************
Toshio Kuratomi had written this in a comment about the rgb2gif code:
Besides fixing bugs, what's really needed is for someone to work out how to
calculate a colormap for writing GIFs from rgb sources. Right now, an rgb
source that has only two colors (b/w) is being converted into an 8 bit GIF....
Which is horrendously wasteful without compression.
I (ESR) took this off the main to-do list in 2012 because I don't think
the GIFLIB project actually needs to be in the converters-and-tools business.
Plenty of hackers do that; our jub is to supply stable library capability
with our utilities mainly interesting as test tools.
***************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include <fcntl.h>
#ifdef _WIN32
#include <io.h>
#endif /* _WIN32 */
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "gif2rgb"
static char
*VersionStr =
PROGRAM_NAME
VERSION_COOKIE
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" v%- c%-#Colors!d s%-Width|Height!d!d 1%- o%-OutFileName!s h%- GifFile!*s";
static void LoadRGB(char *FileName,
int OneFileFlag,
GifByteType **RedBuffer,
GifByteType **GreenBuffer,
GifByteType **BlueBuffer,
int Width, int Height);
static void SaveGif(GifByteType *OutputBuffer,
int Width, int Height,
int ExpColorMapSize, ColorMapObject *OutputColorMap);
/******************************************************************************
Load RGB file into internal frame buffer.
******************************************************************************/
static void LoadRGB(char *FileName,
int OneFileFlag,
GifByteType **RedBuffer,
GifByteType **GreenBuffer,
GifByteType **BlueBuffer,
int Width, int Height)
{
int i;
unsigned long Size;
GifByteType *RedP, *GreenP, *BlueP;
FILE *rgbfp[3];
Size = ((long) Width) * Height * sizeof(GifByteType);
if ((*RedBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
(*GreenBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
(*BlueBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
RedP = *RedBuffer;
GreenP = *GreenBuffer;
BlueP = *BlueBuffer;
if (FileName != NULL) {
if (OneFileFlag) {
if ((rgbfp[0] = fopen(FileName, "rb")) == NULL)
GIF_EXIT("Can't open input file name.");
}
else {
static char *Postfixes[] = { ".R", ".G", ".B" };
char OneFileName[80];
for (i = 0; i < 3; i++) {
strncpy(OneFileName, FileName, sizeof(OneFileName)-1);
/* cppcheck-suppress uninitstring */
strncat(OneFileName, Postfixes[i],
sizeof(OneFileName) - 1 - strlen(OneFileName));
if ((rgbfp[i] = fopen(OneFileName, "rb")) == NULL)
GIF_EXIT("Can't open input file name.");
}
}
}
else {
OneFileFlag = true;
#ifdef _WIN32
_setmode(0, O_BINARY);
#endif /* _WIN32 */
rgbfp[0] = stdin;
}
GifQprintf("\n%s: RGB image: ", PROGRAM_NAME);
if (OneFileFlag) {
GifByteType *Buffer, *BufferP;
if ((Buffer = (GifByteType *) malloc(Width * 3)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < Height; i++) {
int j;
GifQprintf("\b\b\b\b%-4d", i);
if (fread(Buffer, Width * 3, 1, rgbfp[0]) != 1)
GIF_EXIT("Input file(s) terminated prematurly.");
for (j = 0, BufferP = Buffer; j < Width; j++) {
*RedP++ = *BufferP++;
*GreenP++ = *BufferP++;
*BlueP++ = *BufferP++;
}
}
free((char *) Buffer);
fclose(rgbfp[0]);
}
else {
for (i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (fread(RedP, Width, 1, rgbfp[0]) != 1 ||
fread(GreenP, Width, 1, rgbfp[1]) != 1 ||
fread(BlueP, Width, 1, rgbfp[2]) != 1)
GIF_EXIT("Input file(s) terminated prematurly.");
RedP += Width;
GreenP += Width;
BlueP += Width;
}
fclose(rgbfp[0]);
// cppcheck-suppress useClosedFile
fclose(rgbfp[1]);
// cppcheck-suppress useClosedFile
fclose(rgbfp[2]);
}
}
/******************************************************************************
Save the GIF resulting image.
******************************************************************************/
static void SaveGif(GifByteType *OutputBuffer,
int Width, int Height,
int ExpColorMapSize, ColorMapObject *OutputColorMap)
{
int i, Error;
GifFileType *GifFile;
GifByteType *Ptr = OutputBuffer;
/* Open stdout for the output file: */
if ((GifFile = EGifOpenFileHandle(1, &Error)) == NULL) {
PrintGifError(Error);
free(OutputBuffer);
GifFreeMapObject(OutputColorMap);
exit(EXIT_FAILURE);
}
if (EGifPutScreenDesc(GifFile,
Width, Height, ExpColorMapSize, 0,
OutputColorMap) == GIF_ERROR ||
EGifPutImageDesc(GifFile,
0, 0, Width, Height, false, NULL) ==
GIF_ERROR) {
PrintGifError(Error);
free(OutputBuffer);
GifFreeMapObject(OutputColorMap);
exit(EXIT_FAILURE);
}
GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top,
GifFile->Image.Width, GifFile->Image.Height);
for (i = 0; i < Height; i++) {
if (EGifPutLine(GifFile, Ptr, Width) == GIF_ERROR) {
free(OutputBuffer);
GifFreeMapObject(OutputColorMap);
exit(EXIT_FAILURE);
}
GifQprintf("\b\b\b\b%-4d", Height - i - 1);
Ptr += Width;
}
if (EGifCloseFile(GifFile, &Error) == GIF_ERROR) {
PrintGifError(Error);
free(OutputBuffer);
GifFreeMapObject(OutputColorMap);
exit(EXIT_FAILURE);
}
}
/******************************************************************************
Close output file (if open), and exit.
******************************************************************************/
static void RGB2GIF(bool OneFileFlag, int NumFiles, char *FileName,
int ExpNumOfColors, int Width, int Height)
{
int ColorMapSize;
GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL,
*OutputBuffer = NULL;
ColorMapObject *OutputColorMap = NULL;
ColorMapSize = 1 << ExpNumOfColors;
if (NumFiles == 1) {
LoadRGB(FileName, OneFileFlag,
&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
}
else {
LoadRGB(NULL, OneFileFlag,
&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
}
if ((OutputColorMap = GifMakeMapObject(ColorMapSize, NULL)) == NULL ||
(OutputBuffer = (GifByteType *) malloc(Width * Height *
sizeof(GifByteType))) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
if (GifQuantizeBuffer(Width, Height, &ColorMapSize,
RedBuffer, GreenBuffer, BlueBuffer,
OutputBuffer, OutputColorMap->Colors) == GIF_ERROR)
exit(EXIT_FAILURE);
free((char *) RedBuffer);
free((char *) GreenBuffer);
free((char *) BlueBuffer);
SaveGif(OutputBuffer, Width, Height, ExpNumOfColors, OutputColorMap);
}
/******************************************************************************
The real screen dumping routine.
******************************************************************************/
static void DumpScreen2RGB(char *FileName, int OneFileFlag,
ColorMapObject *ColorMap,
GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight)
{
int i, j;
GifRowType GifRow;
GifColorType *ColorMapEntry;
FILE *rgbfp[3];
if (FileName != NULL) {
if (OneFileFlag) {
if ((rgbfp[0] = fopen(FileName, "wb")) == NULL)
GIF_EXIT("Can't open input file name.");
} else {
static char *Postfixes[] = { ".R", ".G", ".B" };
char OneFileName[80];
for (i = 0; i < 3; i++) {
strncpy(OneFileName, FileName, sizeof(OneFileName)-1);
/* cppcheck-suppress uninitstring */
strncat(OneFileName, Postfixes[i],
sizeof(OneFileName) - 1 - strlen(OneFileName));
if ((rgbfp[i] = fopen(OneFileName, "wb")) == NULL) {
GIF_EXIT("Can't open input file name.");
}
}
}
} else {
OneFileFlag = true;
#ifdef _WIN32
_setmode(1, O_BINARY);
#endif /* _WIN32 */
rgbfp[0] = stdout;
}
if (OneFileFlag) {
unsigned char *Buffer, *BufferP;
if ((Buffer = (unsigned char *) malloc(ScreenWidth * 3)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < ScreenHeight; i++) {
GifRow = ScreenBuffer[i];
GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) {
ColorMapEntry = &ColorMap->Colors[GifRow[j]];
*BufferP++ = ColorMapEntry->Red;
*BufferP++ = ColorMapEntry->Green;
*BufferP++ = ColorMapEntry->Blue;
}
if (fwrite(Buffer, ScreenWidth * 3, 1, rgbfp[0]) != 1)
GIF_EXIT("Write to file(s) failed.");
}
free((char *) Buffer);
fclose(rgbfp[0]);
} else {
unsigned char *Buffers[3];
if ((Buffers[0] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
(Buffers[1] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
(Buffers[2] = (unsigned char *) malloc(ScreenWidth)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < ScreenHeight; i++) {
GifRow = ScreenBuffer[i];
GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
for (j = 0; j < ScreenWidth; j++) {
ColorMapEntry = &ColorMap->Colors[GifRow[j]];
Buffers[0][j] = ColorMapEntry->Red;
Buffers[1][j] = ColorMapEntry->Green;
Buffers[2][j] = ColorMapEntry->Blue;
}
if (fwrite(Buffers[0], ScreenWidth, 1, rgbfp[0]) != 1 ||
fwrite(Buffers[1], ScreenWidth, 1, rgbfp[1]) != 1 ||
fwrite(Buffers[2], ScreenWidth, 1, rgbfp[2]) != 1)
GIF_EXIT("Write to file(s) failed.");
}
free((char *) Buffers[0]);
free((char *) Buffers[1]);
free((char *) Buffers[2]);
fclose(rgbfp[0]);
// cppcheck-suppress useClosedFile
fclose(rgbfp[1]);
// cppcheck-suppress useClosedFile
fclose(rgbfp[2]);
}
}
static void GIF2RGB(int NumFiles, char *FileName,
bool OneFileFlag,
char *OutFileName)
{
int i, j, Size, Row, Col, Width, Height, ExtCode, Count;
GifRecordType RecordType;
GifByteType *Extension;
GifRowType *ScreenBuffer;
GifFileType *GifFile;
int
InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
int ImageNum = 0;
ColorMapObject *ColorMap;
int Error;
if (NumFiles == 1) {
int Error;
if ((GifFile = DGifOpenFileName(FileName, &Error)) == NULL) {
PrintGifError(Error);
exit(EXIT_FAILURE);
}
}
else {
int Error;
/* Use stdin instead: */
if ((GifFile = DGifOpenFileHandle(0, &Error)) == NULL) {
PrintGifError(Error);
exit(EXIT_FAILURE);
}
}
if (GifFile->SHeight == 0 || GifFile->SWidth == 0) {
fprintf(stderr, "Image of width or height 0\n");
exit(EXIT_FAILURE);
}
/*
* Allocate the screen as vector of column of rows. Note this
* screen is device independent - it's the screen defined by the
* GIF file parameters.
*/
if ((ScreenBuffer = (GifRowType *)
malloc(GifFile->SHeight * sizeof(GifRowType))) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
Size = GifFile->SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < GifFile->SWidth; i++) /* Set its color to BackGround. */
ScreenBuffer[0][i] = GifFile->SBackGroundColor;
for (i = 1; i < GifFile->SHeight; i++) {
/* Allocate the other rows, and set their color to background too: */
if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
}
/* Scan the content of the GIF file and load the image(s) in: */
do {
if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
Row = GifFile->Image.Top; /* Image Position relative to Screen. */
Col = GifFile->Image.Left;
Width = GifFile->Image.Width;
Height = GifFile->Image.Height;
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
if (GifFile->Image.Left + GifFile->Image.Width > GifFile->SWidth ||
GifFile->Image.Top + GifFile->Image.Height > GifFile->SHeight) {
fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n",ImageNum);
exit(EXIT_FAILURE);
}
if (GifFile->Image.Interlace) {
/* Need to perform 4 passes on the images: */
for (Count = i = 0; i < 4; i++)
for (j = Row + InterlacedOffset[i]; j < Row + Height;
j += InterlacedJumps[i]) {
GifQprintf("\b\b\b\b%-4d", Count++);
if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
Width) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
}
}
else {
for (i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
Width) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
}
}
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
PrintGifError(GifFile->Error);
exit(EXIT_FAILURE);
}
}
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be trapped by DGifGetRecordType. */
break;
}
} while (RecordType != TERMINATE_RECORD_TYPE);
/* Lets dump it - set the global variables required and do it: */
ColorMap = (GifFile->Image.ColorMap
? GifFile->Image.ColorMap
: GifFile->SColorMap);
if (ColorMap == NULL) {
fprintf(stderr, "Gif Image does not have a colormap\n");
exit(EXIT_FAILURE);
}
DumpScreen2RGB(OutFileName, OneFileFlag,
ColorMap,
ScreenBuffer,
GifFile->SWidth, GifFile->SHeight);
(void)free(ScreenBuffer);
if (DGifCloseFile(GifFile, &Error) == GIF_ERROR) {
PrintGifError(Error);
exit(EXIT_FAILURE);
}
}
/******************************************************************************
* Interpret the command line and scan the given GIF file.
******************************************************************************/
int main(int argc, char **argv)
{
bool Error, OutFileFlag = false, ColorFlag = false, SizeFlag = false;
int NumFiles, Width = 0, Height = 0, ExpNumOfColors = 8;
char *OutFileName,
**FileName = NULL;
static bool
OneFileFlag = false,
HelpFlag = false;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifNoisyPrint,
&ColorFlag, &ExpNumOfColors, &SizeFlag, &Width, &Height,
&OneFileFlag, &OutFileFlag, &OutFileName,
&HelpFlag, &NumFiles, &FileName)) != false ||
(NumFiles > 1 && !HelpFlag)) {
if (Error)
GAPrintErrMsg(Error);
else if (NumFiles > 1)
GIF_MESSAGE("Error in command line parsing - one input file please.");
GAPrintHowTo(CtrlStr);
exit(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
if (!OutFileFlag) OutFileName = NULL;
if (SizeFlag && Width > 0 && Height > 0)
RGB2GIF(OneFileFlag, NumFiles, *FileName,
ExpNumOfColors, Width, Height);
else
GIF2RGB(NumFiles, *FileName, OneFileFlag, OutFileName);
return 0;
}
/* end */