539 lines
16 KiB
C
539 lines
16 KiB
C
/*****************************************************************************
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gif2rgb - convert GIF to 24-bit RGB pixel triples or vice-versa
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SPDX-License-Identifier: MIT
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*****************************************************************************/
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/***************************************************************************
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Toshio Kuratomi had written this in a comment about the rgb2gif code:
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Besides fixing bugs, what's really needed is for someone to work out how to
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calculate a colormap for writing GIFs from rgb sources. Right now, an rgb
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source that has only two colors (b/w) is being converted into an 8 bit GIF....
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Which is horrendously wasteful without compression.
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I (ESR) took this off the main to-do list in 2012 because I don't think
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the GIFLIB project actually needs to be in the converters-and-tools business.
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Plenty of hackers do that; our job is to supply stable library capability
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with our utilities mainly interesting as test tools.
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***************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#ifdef _WIN32
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#include <io.h>
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#endif /* _WIN32 */
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "gif2rgb"
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static char
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*VersionStr =
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PROGRAM_NAME
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VERSION_COOKIE
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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" v%- c%-#Colors!d s%-Width|Height!d!d 1%- o%-OutFileName!s h%- GifFile!*s";
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static void LoadRGB(char *FileName,
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int OneFileFlag,
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GifByteType **RedBuffer,
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GifByteType **GreenBuffer,
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GifByteType **BlueBuffer,
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int Width, int Height);
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static void SaveGif(GifByteType *OutputBuffer,
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int Width, int Height,
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int ExpColorMapSize, ColorMapObject *OutputColorMap);
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/******************************************************************************
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Load RGB file into internal frame buffer.
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******************************************************************************/
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static void LoadRGB(char *FileName,
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int OneFileFlag,
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GifByteType **RedBuffer,
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GifByteType **GreenBuffer,
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GifByteType **BlueBuffer,
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int Width, int Height)
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{
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int i;
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unsigned long Size;
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GifByteType *RedP, *GreenP, *BlueP;
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FILE *rgbfp[3];
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Size = ((long) Width) * Height * sizeof(GifByteType);
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if ((*RedBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
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(*GreenBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
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(*BlueBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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RedP = *RedBuffer;
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GreenP = *GreenBuffer;
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BlueP = *BlueBuffer;
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if (FileName != NULL) {
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if (OneFileFlag) {
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if ((rgbfp[0] = fopen(FileName, "rb")) == NULL)
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GIF_EXIT("Can't open input file name.");
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}
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else {
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static char *Postfixes[] = { ".R", ".G", ".B" };
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char OneFileName[80];
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for (i = 0; i < 3; i++) {
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strncpy(OneFileName, FileName, sizeof(OneFileName)-1);
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strncat(OneFileName, Postfixes[i],
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sizeof(OneFileName) - 1 - strlen(OneFileName));
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if ((rgbfp[i] = fopen(OneFileName, "rb")) == NULL)
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GIF_EXIT("Can't open input file name.");
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}
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}
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}
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else {
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OneFileFlag = true;
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#ifdef _WIN32
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_setmode(0, O_BINARY);
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#endif /* _WIN32 */
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rgbfp[0] = stdin;
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}
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GifQprintf("\n%s: RGB image: ", PROGRAM_NAME);
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if (OneFileFlag) {
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GifByteType *Buffer, *BufferP;
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if ((Buffer = (GifByteType *) malloc(Width * 3)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < Height; i++) {
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int j;
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GifQprintf("\b\b\b\b%-4d", i);
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if (fread(Buffer, Width * 3, 1, rgbfp[0]) != 1)
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GIF_EXIT("Input file(s) terminated prematurly.");
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for (j = 0, BufferP = Buffer; j < Width; j++) {
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*RedP++ = *BufferP++;
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*GreenP++ = *BufferP++;
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*BlueP++ = *BufferP++;
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}
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}
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free((char *) Buffer);
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fclose(rgbfp[0]);
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}
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else {
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (fread(RedP, Width, 1, rgbfp[0]) != 1 ||
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fread(GreenP, Width, 1, rgbfp[1]) != 1 ||
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fread(BlueP, Width, 1, rgbfp[2]) != 1)
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GIF_EXIT("Input file(s) terminated prematurly.");
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RedP += Width;
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GreenP += Width;
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BlueP += Width;
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}
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fclose(rgbfp[0]);
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fclose(rgbfp[1]);
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fclose(rgbfp[2]);
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}
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}
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/******************************************************************************
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Save the GIF resulting image.
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******************************************************************************/
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static void SaveGif(GifByteType *OutputBuffer,
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int Width, int Height,
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int ExpColorMapSize, ColorMapObject *OutputColorMap)
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{
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int i, Error;
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GifFileType *GifFile;
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GifByteType *Ptr = OutputBuffer;
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/* Open stdout for the output file: */
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if ((GifFile = EGifOpenFileHandle(1, &Error)) == NULL) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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if (EGifPutScreenDesc(GifFile,
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Width, Height, ExpColorMapSize, 0,
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OutputColorMap) == GIF_ERROR ||
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EGifPutImageDesc(GifFile,
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0, 0, Width, Height, false, NULL) == GIF_ERROR) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top,
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GifFile->Image.Width, GifFile->Image.Height);
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for (i = 0; i < Height; i++) {
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if (EGifPutLine(GifFile, Ptr, Width) == GIF_ERROR)
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exit(EXIT_FAILURE);
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GifQprintf("\b\b\b\b%-4d", Height - i - 1);
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Ptr += Width;
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}
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if (EGifCloseFile(GifFile, &Error) == GIF_ERROR) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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}
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/******************************************************************************
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Close output file (if open), and exit.
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******************************************************************************/
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static void RGB2GIF(bool OneFileFlag, int NumFiles, char *FileName,
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int ExpNumOfColors, int Width, int Height)
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{
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int ColorMapSize;
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GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL,
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*OutputBuffer = NULL;
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ColorMapObject *OutputColorMap = NULL;
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ColorMapSize = 1 << ExpNumOfColors;
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if (NumFiles == 1) {
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LoadRGB(FileName, OneFileFlag,
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&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
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}
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else {
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LoadRGB(NULL, OneFileFlag,
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&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
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}
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if ((OutputColorMap = GifMakeMapObject(ColorMapSize, NULL)) == NULL ||
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(OutputBuffer = (GifByteType *) malloc(Width * Height *
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sizeof(GifByteType))) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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if (GifQuantizeBuffer(Width, Height, &ColorMapSize,
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RedBuffer, GreenBuffer, BlueBuffer,
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OutputBuffer, OutputColorMap->Colors) == GIF_ERROR)
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exit(EXIT_FAILURE);
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free((char *) RedBuffer);
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free((char *) GreenBuffer);
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free((char *) BlueBuffer);
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SaveGif(OutputBuffer, Width, Height, ExpNumOfColors, OutputColorMap);
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}
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/******************************************************************************
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The real screen dumping routine.
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******************************************************************************/
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static void DumpScreen2RGB(char *FileName, int OneFileFlag,
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ColorMapObject *ColorMap,
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GifRowType *ScreenBuffer,
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int ScreenWidth, int ScreenHeight)
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{
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int i, j;
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GifRowType GifRow;
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GifColorType *ColorMapEntry;
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FILE *rgbfp[3];
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if (FileName != NULL) {
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if (OneFileFlag) {
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if ((rgbfp[0] = fopen(FileName, "wb")) == NULL)
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GIF_EXIT("Can't open input file name.");
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} else {
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static char *Postfixes[] = { ".R", ".G", ".B" };
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char OneFileName[80];
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for (i = 0; i < 3; i++) {
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strncpy(OneFileName, FileName, sizeof(OneFileName)-1);
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strncat(OneFileName, Postfixes[i],
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sizeof(OneFileName) - 1 - strlen(OneFileName));
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if ((rgbfp[i] = fopen(OneFileName, "wb")) == NULL) {
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GIF_EXIT("Can't open input file name.");
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}
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}
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}
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} else {
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OneFileFlag = true;
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#ifdef _WIN32
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_setmode(1, O_BINARY);
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#endif /* _WIN32 */
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rgbfp[0] = stdout;
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}
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if (ColorMap == NULL) {
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fprintf(stderr, "Color map pointer is NULL.\n");
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exit(EXIT_FAILURE);
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}
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if (OneFileFlag) {
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unsigned char *Buffer, *BufferP;
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if ((Buffer = (unsigned char *) malloc(ScreenWidth * 3)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < ScreenHeight; i++) {
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GifRow = ScreenBuffer[i];
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GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
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for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) {
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ColorMapEntry = &ColorMap->Colors[GifRow[j]];
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*BufferP++ = ColorMapEntry->Red;
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*BufferP++ = ColorMapEntry->Green;
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*BufferP++ = ColorMapEntry->Blue;
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}
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if (fwrite(Buffer, ScreenWidth * 3, 1, rgbfp[0]) != 1)
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GIF_EXIT("Write to file(s) failed.");
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}
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free((char *) Buffer);
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fclose(rgbfp[0]);
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} else {
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unsigned char *Buffers[3];
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if ((Buffers[0] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
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(Buffers[1] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
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(Buffers[2] = (unsigned char *) malloc(ScreenWidth)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < ScreenHeight; i++) {
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GifRow = ScreenBuffer[i];
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GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
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for (j = 0; j < ScreenWidth; j++) {
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ColorMapEntry = &ColorMap->Colors[GifRow[j]];
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Buffers[0][j] = ColorMapEntry->Red;
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Buffers[1][j] = ColorMapEntry->Green;
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Buffers[2][j] = ColorMapEntry->Blue;
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}
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if (fwrite(Buffers[0], ScreenWidth, 1, rgbfp[0]) != 1 ||
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fwrite(Buffers[1], ScreenWidth, 1, rgbfp[1]) != 1 ||
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fwrite(Buffers[2], ScreenWidth, 1, rgbfp[2]) != 1)
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GIF_EXIT("Write to file(s) failed.");
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}
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free((char *) Buffers[0]);
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free((char *) Buffers[1]);
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free((char *) Buffers[2]);
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fclose(rgbfp[0]);
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fclose(rgbfp[1]);
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fclose(rgbfp[2]);
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}
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}
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static void GIF2RGB(int NumFiles, char *FileName,
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bool OneFileFlag,
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char *OutFileName)
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{
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int i, j, Size, Row, Col, Width, Height, ExtCode, Count;
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GifRecordType RecordType;
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GifByteType *Extension;
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GifRowType *ScreenBuffer;
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GifFileType *GifFile;
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int
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InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
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InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
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int ImageNum = 0;
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ColorMapObject *ColorMap;
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int Error;
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if (NumFiles == 1) {
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int Error;
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if ((GifFile = DGifOpenFileName(FileName, &Error)) == NULL) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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}
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else {
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int Error;
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/* Use stdin instead: */
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if ((GifFile = DGifOpenFileHandle(0, &Error)) == NULL) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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}
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if (GifFile->SHeight == 0 || GifFile->SWidth == 0) {
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fprintf(stderr, "Image of width or height 0\n");
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exit(EXIT_FAILURE);
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}
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/*
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* Allocate the screen as vector of column of rows. Note this
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* screen is device independent - it's the screen defined by the
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* GIF file parameters.
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*/
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if ((ScreenBuffer = (GifRowType *)
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malloc(GifFile->SHeight * sizeof(GifRowType))) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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Size = GifFile->SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
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if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < GifFile->SWidth; i++) /* Set its color to BackGround. */
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ScreenBuffer[0][i] = GifFile->SBackGroundColor;
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for (i = 1; i < GifFile->SHeight; i++) {
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/* Allocate the other rows, and set their color to background too: */
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if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
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}
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/* Scan the content of the GIF file and load the image(s) in: */
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do {
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if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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Row = GifFile->Image.Top; /* Image Position relative to Screen. */
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Col = GifFile->Image.Left;
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Width = GifFile->Image.Width;
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Height = GifFile->Image.Height;
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GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
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if (GifFile->Image.Left + GifFile->Image.Width > GifFile->SWidth ||
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GifFile->Image.Top + GifFile->Image.Height > GifFile->SHeight) {
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fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n",ImageNum);
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exit(EXIT_FAILURE);
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}
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if (GifFile->Image.Interlace) {
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/* Need to perform 4 passes on the images: */
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for (Count = i = 0; i < 4; i++)
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for (j = Row + InterlacedOffset[i]; j < Row + Height;
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j += InterlacedJumps[i]) {
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GifQprintf("\b\b\b\b%-4d", Count++);
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if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
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Width) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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}
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}
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else {
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
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Width) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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}
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}
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break;
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case EXTENSION_RECORD_TYPE:
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
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PrintGifError(GifFile->Error);
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exit(EXIT_FAILURE);
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}
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}
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break;
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case TERMINATE_RECORD_TYPE:
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break;
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default: /* Should be trapped by DGifGetRecordType. */
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break;
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}
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} while (RecordType != TERMINATE_RECORD_TYPE);
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/* Lets dump it - set the global variables required and do it: */
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ColorMap = (GifFile->Image.ColorMap
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? GifFile->Image.ColorMap
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: GifFile->SColorMap);
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if (ColorMap == NULL) {
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fprintf(stderr, "Gif Image does not have a colormap\n");
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exit(EXIT_FAILURE);
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}
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/* check that the background color isn't garbage (SF bug #87) */
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if (GifFile->SBackGroundColor < 0 || GifFile->SBackGroundColor >= ColorMap->ColorCount) {
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fprintf(stderr, "Background color out of range for colormap\n");
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exit(EXIT_FAILURE);
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}
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DumpScreen2RGB(OutFileName, OneFileFlag,
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ColorMap,
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ScreenBuffer,
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GifFile->SWidth, GifFile->SHeight);
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(void)free(ScreenBuffer);
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if (DGifCloseFile(GifFile, &Error) == GIF_ERROR) {
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PrintGifError(Error);
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exit(EXIT_FAILURE);
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}
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}
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/******************************************************************************
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* Interpret the command line and scan the given GIF file.
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******************************************************************************/
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int main(int argc, char **argv)
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{
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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 */
|