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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to create a test image of White and Red/Green/Blue levels for *
* test purposes. The Primary (RGB) and Secondary (YCM) are also displayed. *
* background. *
* Options: *
* -q : quiet printing mode. *
* -s Width Height : set image size. *
* -l levels : number of color levels. *
* -h : on-line help. *
******************************************************************************
* History: *
* 4 Jan 90 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef __MSDOS__
#include <stdlib.h>
#include <alloc.h>
#endif /* __MSDOS__ */
#ifndef __MSDOS__
#include <stdlib.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "GifWedge"
#define DEFAULT_WIDTH 640
#define DEFAULT_HEIGHT 350
#define DEFAULT_NUM_LEVELS 16 /* Number of colors to gen the image. */
#ifdef __MSDOS__
extern unsigned int
_stklen = 16384; /* Increase default stack size. */
#endif /* __MSDOS__ */
#ifdef SYSV
static char *VersionStr =
"Gif toolkit module,\t\tGershon Elber\n\
(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr = "GifWedge q%- l%-#Lvls!d s%-Width|Height!d!d h%-";
#else
static char
*VersionStr =
PROGRAM_NAME
GIF_LIB_VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" q%- l%-#Lvls!d s%-Width|Height!d!d h%-";
#endif /* SYSV */
static int
NumLevels = DEFAULT_NUM_LEVELS,
ImageWidth = DEFAULT_WIDTH,
ImageHeight = DEFAULT_HEIGHT;
static void QuitGifError(GifFileType *GifFile);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
int main(int argc, char **argv)
{
int i, j, l, c, Error, LevelStep, LogNumLevels,
Count = 0, LevelsFlag = FALSE, SizeFlag = FALSE, HelpFlag = FALSE;
GifRowType Line;
ColorMapObject *ColorMap;
GifFileType *GifFile;
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&GifQuietPrint, &LevelsFlag, &NumLevels,
&SizeFlag, &ImageWidth, &ImageHeight,
&HelpFlag)) != FALSE) {
GAPrintErrMsg(Error);
GAPrintHowTo(CtrlStr);
exit(EXIT_FAILURE);
}
if (HelpFlag) {
fprintf(stderr, VersionStr);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
/* Make sure the number of levels is power of 2 (up to 32 levels.). */
for (i = 1; i < 6; i++) if (NumLevels == (1 << i)) break;
if (i == 6) GIF_EXIT("#Lvls (-l option) is not power of 2 up to 32.");
LogNumLevels = i + 3; /* Multiple by 8 (see below). */
LevelStep = 256 / NumLevels;
/* Make sure the image dimension is a multiple of NumLevels horizontally */
/* and 7 (White, Red, Green, Blue and Yellow Cyan Magenta) vertically. */
ImageWidth = (ImageWidth / NumLevels) * NumLevels;
ImageHeight = (ImageHeight / 7) * 7;
/* Open stdout for the output file: */
if ((GifFile = EGifOpenFileHandle(1)) == NULL)
QuitGifError(GifFile);
/* Dump out screen description with given size and generated color map: */
/* The color map has 7 NumLevels colors for White, Red, Green and then */
/* The secondary colors Yellow Cyan and magenta. */
if ((ColorMap = MakeMapObject(8 * NumLevels, NULL)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < 8; i++) /* Set color map. */
for (j = 0; j < NumLevels; j++) {
l = LevelStep * j;
c = i * NumLevels + j;
ColorMap->Colors[c].Red = (i == 0 || i == 1 || i == 4 || i == 6) * l;
ColorMap->Colors[c].Green = (i == 0 || i == 2 || i == 4 || i == 5) * l;
ColorMap->Colors[c].Blue = (i == 0 || i == 3 || i == 5 || i == 6) * l;
}
if (EGifPutScreenDesc(GifFile,
ImageWidth, ImageHeight, LogNumLevels, 0, ColorMap)
== GIF_ERROR)
QuitGifError(GifFile);
/* Dump out the image descriptor: */
if (EGifPutImageDesc(GifFile,
0, 0, ImageWidth, ImageHeight, FALSE, NULL) == GIF_ERROR)
QuitGifError(GifFile);
GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top,
GifFile->Image.Width, GifFile->Image.Height);
/* Allocate one scan line to be used for all image. */
if ((Line = (GifRowType) malloc(sizeof(GifPixelType) * ImageWidth)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
/* Dump the pixels: */
for (c = 0; c < 7; c++) {
for (i = 0, l = 0; i < NumLevels; i++)
for (j = 0; j < ImageWidth / NumLevels; j++)
Line[l++] = i + NumLevels * c;
for (i = 0; i < ImageHeight / 7; i++) {
if (EGifPutLine(GifFile, Line, ImageWidth) == GIF_ERROR)
QuitGifError(GifFile);
GifQprintf("\b\b\b\b%-4d", Count++);
}
}
if (EGifCloseFile(GifFile) == GIF_ERROR)
QuitGifError(GifFile);
return 0;
}
/******************************************************************************
* Close output file (if open), and exit. *
******************************************************************************/
static void QuitGifError(GifFileType *GifFile)
{
PrintGifError();
if (GifFile != NULL) DGifCloseFile(GifFile);
exit(EXIT_FAILURE);
}
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