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331 lines
10 KiB
C
331 lines
10 KiB
C
/*****************************************************************************
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* "Gif-Lib" - Yet another gif library. *
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* *
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* Written by: Gershon Elber Ver 0.1, Aug. 1991 *
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******************************************************************************
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* Program to rotate a GIF image by an arbitrary angle. *
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* Options: *
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* -q : quiet printing mode. *
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* -a Angle : angle to rotate with respect to the X axis. *
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* -s Width Height : specifies size of output image. *
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* -h : on-line help. *
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******************************************************************************
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* History: *
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* 2 Aug 91 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef __MSDOS__
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#include <graphics.h>
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#include <stdlib.h>
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#include <alloc.h>
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#include <io.h>
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#include <dos.h>
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#include <bios.h>
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#endif /* __MSDOS__ */
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#ifndef __MSDOS__
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#include <stdlib.h>
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#endif
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#include <stdio.h>
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#include <math.h>
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#include <ctype.h>
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#include <string.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_H */
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#include "gif_lib.h"
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#include "getarg.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif /* M_PI */
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#define PROGRAM_NAME "GifRotat"
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#ifdef __MSDOS__
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extern unsigned int
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_stklen = 16384; /* Increase default stack size. */
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#endif /* __MSDOS__ */
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#ifdef SYSV
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static char *VersionStr =
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"Gif toolkit module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber.\n";
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static char
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*CtrlStr = "GifRotat a!-Angle!d q%- s%-Width|Height!d!d h%- GifFile!*s";
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#else
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static char
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*VersionStr =
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PROGRAM_NAME
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GIF_LIB_VERSION
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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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" a!-Angle!d q%- s%-Width|Height!d!d h%- GifFile!*s";
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#endif /* SYSV */
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static 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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static void RotateGifImage(GifRowType *ScreenBuffer, GifFileType *SrcGifFile,
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int Angle, ColorMapObject *ColorMap,
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int DstWidth, int DstHeight);
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static void RotateGifLine(GifRowType *ScreenBuffer, int BackGroundColor,
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int SrcWidth, int SrcHeight,
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int Angle, GifRowType DstLine,
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int DstWidth, int DstHeight, int y);
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static void QuitGifError(GifFileType *DstGifFile);
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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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int i, j, Size, Error, NumFiles, Col, Row, Count, ExtCode,
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DstWidth, DstHeight, Width, Height,
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ImageNum = 0,
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DstSizeFlag = FALSE,
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AngleFlag = FALSE,
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Angle = 0,
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HelpFlag = FALSE;
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char **FileName = NULL;
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GifRecordType RecordType;
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GifByteType *Extension;
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GifFileType *GifFile;
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GifRowType *ScreenBuffer;
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ColorMapObject *ColorMap = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr,
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&AngleFlag, &Angle, &GifQuietPrint,
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&DstSizeFlag, &DstWidth, &DstHeight, &HelpFlag,
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&NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(EXIT_FAILURE);
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}
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if (HelpFlag) {
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fprintf(stderr, VersionStr);
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GAPrintHowTo(CtrlStr);
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exit(EXIT_SUCCESS);
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}
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if (NumFiles == 1) {
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if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
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PrintGifError();
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exit(EXIT_FAILURE);
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}
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}
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else {
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/* Use the stdin instead: */
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#ifdef __MSDOS__
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setmode(0, O_BINARY);
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#endif /* __MSDOS__ */
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if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
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PrintGifError();
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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. We cannt allocate */
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/* the all screen at once, as this broken minded CPU can allocate up to */
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/* 64k at a time and our image can be bigger than that: */
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/* Note this screen is device independent - its the screen as defined by */
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/* the GIF file parameters itself. */
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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();
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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();
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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();
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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();
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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();
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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();
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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 traps by DGifGetRecordType. */
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break;
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}
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}
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while (RecordType != TERMINATE_RECORD_TYPE);
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ColorMap = (GifFile->Image.ColorMap ? GifFile->Image.ColorMap :
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GifFile->SColorMap);
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if (!DstSizeFlag) {
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DstWidth = GifFile->SWidth;
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DstHeight = GifFile->SHeight;
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}
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/* Perform the actual rotation and dump the image: */
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RotateGifImage(ScreenBuffer, GifFile, Angle, ColorMap,
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DstWidth, DstHeight);
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return 0;
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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 RotateGifImage(GifRowType *ScreenBuffer, GifFileType *SrcGifFile,
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int Angle, ColorMapObject *ColorMap,
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int DstWidth, int DstHeight)
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{
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int i,
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LineSize = DstWidth * sizeof(GifPixelType);
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GifFileType *DstGifFile;
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GifRowType LineBuffer;
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if ((LineBuffer = (GifRowType) malloc(LineSize)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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/* Open stdout for the output file: */
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if ((DstGifFile = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(DstGifFile);
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if (EGifPutScreenDesc(DstGifFile, DstWidth, DstHeight,
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ColorMap->BitsPerPixel, 0, ColorMap) == GIF_ERROR ||
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EGifPutImageDesc(DstGifFile, 0, 0, DstWidth, DstHeight,
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FALSE, NULL) == GIF_ERROR)
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QuitGifError(DstGifFile);
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for (i = 0; i < DstHeight; i++) {
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RotateGifLine(ScreenBuffer, SrcGifFile->SBackGroundColor,
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SrcGifFile->SWidth, SrcGifFile->SHeight,
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Angle, LineBuffer, DstWidth, DstHeight, i);
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if (EGifPutLine(DstGifFile, LineBuffer, DstWidth) == GIF_ERROR)
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QuitGifError(DstGifFile);
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GifQprintf("\b\b\b\b%-4d", DstHeight - i - 1);
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}
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if (EGifCloseFile(DstGifFile) == GIF_ERROR)
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QuitGifError(DstGifFile);
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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 RotateGifLine(GifRowType *ScreenBuffer, int BackGroundColor,
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int SrcWidth, int SrcHeight,
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int Angle, GifRowType DstLine,
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int DstWidth, int DstHeight, int y)
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{
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int x,
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TransSrcX = SrcWidth / 2,
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TransSrcY = SrcHeight / 2,
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TransDstX = DstWidth / 2,
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TransDstY = DstHeight / 2;
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double SinAngle = sin(Angle * M_PI / 180.0),
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CosAngle = cos(Angle * M_PI / 180.0);
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for (x = 0; x < DstWidth; x++)
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{
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int xc = x - TransDstX,
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yc = y - TransDstY,
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SrcX = xc * CosAngle - yc * SinAngle + TransSrcX,
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SrcY = xc * SinAngle + yc * CosAngle + TransSrcY;
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if (SrcX < 0 || SrcX >= SrcWidth ||
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SrcY < 0 || SrcY >= SrcHeight)
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{
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/* Out of the source image domain - set it to background color. */
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*DstLine++ = BackGroundColor;
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}
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else
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*DstLine++ = ScreenBuffer[SrcY][SrcX];
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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 QuitGifError(GifFileType *DstGifFile)
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{
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PrintGifError();
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if (DstGifFile != NULL) EGifCloseFile(DstGifFile);
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exit(EXIT_FAILURE);
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}
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