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José David Guillén
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to display GIF file under X11 window system. *
* Options: *
* -q : quite printing mode. *
* -p PosX PosY : defines the position where to put the image. *
* -d Display : what display should go to. *
* -f : force attempt to allocate the exact colors. This usually look bad... *
* -h : on line help. *
******************************************************************************
* History: *
* 28 Dec 89 - Version 1.0 by Gershon Elber, color allocation is based on the *
* xgif program by John Bradley, bradley@cis.ipenn.edu. *
*****************************************************************************/
#ifdef __MSDOS__
#include <graphics.h>
#include <stdlib.h>
#include <alloc.h>
#include <io.h>
#include <dos.h>
#include <bios.h>
#endif /* __MSDOS__ */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "Gif2X11"
#define ICON_SIZE 60
#define ABS(x) ((x) > 0 ? (x) : (-(x)))
#ifdef __MSDOS__
extern unsigned int
_stklen = 16384; /* Increase default stack size. */
#endif /* __MSDOS__ */
#ifdef SYSV
static char *VersionStr =
"Gif library module,\t\tGershon Elber\n\
(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr = "Gif2X11 q%- p%-PosX|PosY!d!d d%-Display!s f%- h%- GifFile!*s";
#else
static char
*VersionStr =
PROGRAM_NAME
GIF_LIB_VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr =
PROGRAM_NAME
" q%- p%-PosX|PosY!d!d d%-Display!s f%- h%- GifFile!*s";
#endif /* SYSV */
/* Make some variables global, so we could access them faster: */
static int
PosFlag = FALSE,
HelpFlag = FALSE,
DisplayFlag = FALSE,
ForceFlag = FALSE,
ColorMapSize = 0,
BackGround = 0,
XPosX = 0,
XPosY = 0,
InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
static char
*DisplayName = NULL;
static GifColorType
*ColorMap;
/* X specific staff goes here. XColorTable will hold the GIF image colors, */
/* while XPixelTable will hold the pixel number so we can redirect through */
/* it when forming the image bitmap in X format. */
/* Note the table has 256 entry which is the maximum allowed in GIF format. */
static XColor XColorTable[256];
static unsigned long XPixelTable[256];
static Display *XDisplay;
static int XScreen;
static Window Xroot, XImageWndw;
static Colormap XColorMap;
static GC XGraphContext;
static Visual *XVisual;
static XImage *XImageBuffer;
static Pixmap XIcon;
static Cursor XCursor;
static void Screen2X(int argc, char **argv, GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight);
static void AllocateColors1(void);
static void AllocateColors2(void);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int i, j, Error, NumFiles, ImageNum = 0, Size, Row, Col, Width, Height,
ExtCode, Count;
GifRecordType RecordType;
GifByteType *Extension;
char **FileName = NULL;
GifRowType *ScreenBuffer;
GifFileType *GifFile;
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&GifQuitePrint, &PosFlag, &XPosX, &XPosY,
&DisplayFlag, &DisplayName, &ForceFlag,
&HelpFlag, &NumFiles, &FileName)) != FALSE ||
(NumFiles > 1 && !HelpFlag)) {
if (Error)
GAPrintErrMsg(Error);
else if (NumFiles > 1)
GIF_MESSAGE("Error in command line parsing - one GIF file please.");
GAPrintHowTo(CtrlStr);
exit(1);
}
if (HelpFlag) {
fprintf(stderr, VersionStr);
GAPrintHowTo(CtrlStr);
exit(0);
}
if (NumFiles == 1) {
if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
PrintGifError();
exit(-1);
}
}
else {
/* Use the stdin instead: */
#ifdef __MSDOS__
setmode(0, O_BINARY);
#endif /* __MSDOS__ */
if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
PrintGifError();
exit(-1);
}
}
/* Lets see if we can get access to the X server before we even start: */
if ((XDisplay = (Display *) XOpenDisplay(DisplayName)) == NULL)
GIF_EXIT("Failed to access X server, abored.");
XScreen = DefaultScreen(XDisplay);
Xroot = RootWindow(XDisplay, XScreen);
XColorMap = DefaultColormap(XDisplay, XScreen);
XGraphContext = DefaultGC(XDisplay, XScreen);
XVisual = DefaultVisual(XDisplay, XScreen);
XSetBackground(XDisplay, XGraphContext, BlackPixel(XDisplay, XScreen));
XSetForeground(XDisplay, XGraphContext, WhitePixel(XDisplay, XScreen));
/* Allocate the screen as vector of column of rows. We cannt allocate */
/* the all screen at once, as this broken minded CPU can allocate up to */
/* 64k at a time and our image can be bigger than that: */
/* Note this screen is device independent - its the screen as defined by */
/* the GIF file parameters itself. */
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();
exit(-1);
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
Row = GifFile -> ITop; /* Image Position relative to Screen. */
Col = GifFile -> ILeft;
Width = GifFile -> IWidth;
Height = GifFile -> IHeight;
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth ||
GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) {
fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
exit(-2);
}
if (GifFile -> IInterlace) {
/* 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();
exit(-1);
}
}
}
else {
for (i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
Width) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
}
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be traps by DGifGetRecordType. */
break;
}
}
while (RecordType != TERMINATE_RECORD_TYPE);
/* Lets display it - set the global variables required and do it: */
BackGround = GifFile -> SBackGroundColor;
ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap :
GifFile -> SColorMap);
ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel :
GifFile -> SBitsPerPixel);
Screen2X(argc, argv, ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
if (DGifCloseFile(GifFile) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
GifQprintf("\n");
}
/******************************************************************************
* The real display routine. *
******************************************************************************/
static void Screen2X(int argc, char **argv, GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight)
{
int i, j, c, Size, x, y,
MinIntensity, MaxIntensity, AvgIntensity, IconSizeX, IconSizeY;
char *XImageData, *XIconData, KeyBuffer[81];
double Aspect;
GifByteType *OutLine, Data;
unsigned long ValueMask;
GifPixelType *Line;
GifRowType *DitherBuffer;
GifColorType *ColorMapEntry = ColorMap;
XSetWindowAttributes SetWinAttr;
XSizeHints Hints;
XEvent Event;
XExposeEvent *EEvent;
XComposeStatus Stat;
KeySym KS;
/* Let find out what are the intensities in the color map: */
MaxIntensity = 0;
MinIntensity = 256 * 100;
for (i = 0; i < ColorMapSize; i++) {
c = ColorMapEntry[i].Red * 30 +
ColorMapEntry[i].Green * 59 +
ColorMapEntry[i].Blue * 11;
if (c > MaxIntensity) MaxIntensity = c;
if (c < MinIntensity) MinIntensity = c;
}
AvgIntensity = (MinIntensity + MaxIntensity) / 2;
/* The big trick here is to select the colors so lets do this first: */
if (ForceFlag)
AllocateColors2();
else
AllocateColors1();
SetWinAttr.background_pixel = BlackPixel( XDisplay, XScreen );
SetWinAttr.border_pixel = WhitePixel( XDisplay, XScreen );
ValueMask = CWBackPixel | CWBorderPixel;
Hints.flags = PSize | PMinSize | PMaxSize;
Hints.x = Hints.y = 1;
Hints.width = Hints.min_width = Hints.max_width = ScreenWidth;
Hints.height = Hints.min_height = Hints.max_height = ScreenHeight;
if (PosFlag) {
Hints.flags |= USPosition;
Hints.x = XPosX;
Hints.y = XPosY;
}
XImageWndw = XCreateWindow(XDisplay, Xroot, XPosX, XPosY,
ScreenWidth, ScreenHeight,
1, 0,
CopyFromParent, CopyFromParent,
ValueMask, &SetWinAttr);
/* Set up the icon bit map to be a shrinked BW version of the image: */
if (ScreenWidth > ScreenHeight) {
IconSizeX = (ICON_SIZE / 8) * 8;
IconSizeY = (ScreenHeight * ICON_SIZE) / ScreenWidth;
}
else {
IconSizeY = ICON_SIZE;
IconSizeX = (((ScreenWidth * ICON_SIZE) / ScreenHeight) / 8) * 8;
}
XIconData = (char *) malloc(IconSizeX * IconSizeY / 8);
memset(XIconData, 0, IconSizeX * IconSizeY / 8);
for (i = 0; i < IconSizeY; i++) {
y = (i * ScreenHeight / IconSizeY);
Size = i * IconSizeX / 8;
for (j = 0; j < IconSizeX; j++) {
x = j * ScreenWidth / IconSizeX;
c = ScreenBuffer[y][x];
c = ColorMapEntry[c].Red * 30 +
ColorMapEntry[c].Green * 59 +
ColorMapEntry[c].Blue * 11 > AvgIntensity;
XIconData[Size + j / 8] |= c << (j % 8);
}
}
XIcon = XCreateBitmapFromData(XDisplay, XImageWndw, XIconData,
IconSizeX, IconSizeY);
XSetStandardProperties(XDisplay, XImageWndw,
PROGRAM_NAME, PROGRAM_NAME, XIcon,
argv, argc,
&Hints);
XSelectInput(XDisplay, XImageWndw, ExposureMask | KeyPressMask);
/* Set out own cursor: */
XCursor = XCreateFontCursor(XDisplay, XC_diamond_cross);
XDefineCursor(XDisplay, XImageWndw, XCursor);
XMapWindow(XDisplay, XImageWndw);
/* Create the image in X format: */
if ((XImageData = (char *) malloc(ScreenWidth * ScreenHeight)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < ScreenHeight; i++) {
y = i * ScreenWidth;
for (j = 0; j < ScreenWidth; j++)
XImageData[y + j] = XPixelTable[ScreenBuffer[i][j]];
}
XImageBuffer = XCreateImage(XDisplay, XVisual, 8, ZPixmap, 0,
XImageData, ScreenWidth, ScreenHeight,
8, ScreenWidth);
while (TRUE) {
XNextEvent(XDisplay, &Event);
switch (Event.type) {
case Expose:
EEvent = (XExposeEvent *) &Event;
XPutImage(XDisplay, XImageWndw, XGraphContext, XImageBuffer,
EEvent -> x, EEvent -> y,
EEvent -> x, EEvent -> y,
EEvent -> width, EEvent -> height);
break;
case KeyPress:
XLookupString(&Event, KeyBuffer, 80, &KS, &Stat);
if (KeyBuffer[0] == 3) return;
break;
}
}
}
/******************************************************************************
* Routine to allocate the requested colors from the X server. *
* Colors are allocated until success by stripping off the least bits of the *
* colors. *
******************************************************************************/
static void AllocateColors1(void)
{
int Strip, Msk, i, j;
char Msg[80];
for (i = 0; i < 256; i++)
XPixelTable[i] = 0; /* Put reasonable color for out of range. */
for (Strip = 0, Msk = 0xff; Strip < 8; Strip++, Msk <<= 1) {
for (i = 0; i < ColorMapSize; i++) {
/* Prepere color entry in X format. */
XColorTable[i].red = (ColorMap[i].Red & Msk) << 8;
XColorTable[i].green = (ColorMap[i].Green & Msk) << 8;
XColorTable[i].blue = (ColorMap[i].Blue & Msk) << 8;
XColorTable[i].flags = DoRed | DoGreen | DoBlue;
if (XAllocColor(XDisplay, XColorMap, &XColorTable[i]))
XPixelTable[i] = XColorTable[i].pixel;
else
break;
}
if (i < ColorMapSize)
XFreeColors(XDisplay, XColorMap, XPixelTable, i, 0L);
else
break;
}
if (Strip == 8)
GIF_EXIT("Can not display the image - not enough colors available.");
if (Strip != 0) {
sprintf(Msg, "%d bits were stripped off the color map.", Strip);
GIF_MESSAGE(Msg);
}
}
/******************************************************************************
* Routine to allocate the requested colors from the X server. *
* Two stages are performed: *
* 1. Colors are requested directly. *
* 2. If not enough colors can be allocated, the closest current color *
* in current table is selected instead. *
* This allocation is not optimal as when fail to allocate all colors one *
* should pick the right colors to do allocate in order to minimize the *
* closest distance from the unallocated ones under some norm (what is a good *
* norm for the RGB space?). Improve it if you are bored. *
******************************************************************************/
static void AllocateColors2(void)
{
int i, j, Index = 0, Count = 0, XNumOfColors;
char Msg[80];
unsigned long D, Distance, AvgDistance = 0, Red, Green, Blue;
GifBooleanType Failed = FALSE;
XColor *XOldColorTable;
for (i = 0; i < 256; i++) {
if (i < ColorMapSize) { /* Prepere color entry in X format. */
XColorTable[i].red = ColorMap[i].Red << 8;
XColorTable[i].green = ColorMap[i].Green << 8;
XColorTable[i].blue = ColorMap[i].Blue << 8;
XColorTable[i].flags = DoRed | DoGreen | DoBlue;
XPixelTable[i] = -1; /* Not allocated yet. */
}
else
XPixelTable[i] = 0; /* Put reasonable color for out of range. */
}
for (i = 0; i < ColorMapSize; i++) /* Allocate the colors from X: */
if (XAllocColor(XDisplay, XColorMap, &XColorTable[i]))
XPixelTable[i] = XColorTable[i].pixel;
else
Failed = TRUE;
if (Failed) {
XNumOfColors = DisplayCells(XDisplay, XScreen);
XOldColorTable = (XColor *) malloc(sizeof(XColor) * XNumOfColors);
for (i = 0; i < XNumOfColors; i++) XOldColorTable[i].pixel = i;
XQueryColors(XDisplay, XColorMap, XOldColorTable, XNumOfColors);
for (i = 0; i < ColorMapSize; i++) {
/* Allocate closest colors from X: */
if (XPixelTable[i] == -1) { /* Failed to allocate this one. */
Distance = 0xffffffff;
Red = XColorTable[i].red;
Green = XColorTable[i].green;
Blue = XColorTable[i].blue;
for (j = 0; j < XNumOfColors; j++) {
/* Find the closest color in 3D RGB space using L1 norm. */
if ((D = ABS(Red - XOldColorTable[j].red) +
ABS(Green - XOldColorTable[j].green) +
ABS(Blue - XOldColorTable[j].blue)) < Distance) {
Distance = D;
Index = j;
}
}
XPixelTable[i] = Index;
AvgDistance += Distance;
Count++;
}
}
free(XOldColorTable);
sprintf(Msg, "Colors will be approximated (average error = %d).\n",
AvgDistance / Count);
GIF_MESSAGE(Msg);
}
}