diff options
Diffstat (limited to 'giflib-4.1.6/util/gifrsize.c')
| -rw-r--r-- | giflib-4.1.6/util/gifrsize.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/giflib-4.1.6/util/gifrsize.c b/giflib-4.1.6/util/gifrsize.c new file mode 100644 index 0000000..69ca6e0 --- /dev/null +++ b/giflib-4.1.6/util/gifrsize.c @@ -0,0 +1,315 @@ +/***************************************************************************** +* "Gif-Lib" - Yet another gif library. * +* * +* Written by: Gershon Elber Ver 0.1, Jul. 1989 * +****************************************************************************** +* Program to resize GIF by given factors horizontally and vertically. * +* Options: * +* -q : quiet printing mode. * +* -S x y : scale into size as specified by x and y. * +* -s r : resize both x & y direction by factor r. * +* -x r : resize the x direction (horizontally) by factor r. * +* -y r : resize the y direction (vertically) by factor r. * +* -h : on-line help. * +****************************************************************************** +* History: * +* 4 Jul 89 - Version 1.0 by Gershon Elber. * +* 22 Dec 89 - Fix minor bag in discarding last line of input (Version 1.1). * +* 3 Aug 91 - make it scale by an arbitrary size value. * +*****************************************************************************/ + +#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 "GifRSize" + +#define MAX_SCALE 16.0 /* Maximum scaling factor. */ + +#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 = "GifRSize q%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F h%- GifFile!*s"; +#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%- S%-X|Y!d!d s%-Scale!F x%-XScale!F y%-YScale!F h%- GifFile!*s"; +#endif /* SYSV */ + +/* Make some variables global, so we could access them faster: */ +static GifPixelType + BackGroundColor = 0; +static double + XScale = 0.5, + YScale = 0.5; +static int + XSize = 0, + YSize = 0; + +static void ResizeLine(GifRowType LineIn, GifRowType LineOut, + int InLineLen, int OutLineLen); +static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut); + +/****************************************************************************** +* Interpret the command line and scan the given GIF file. * +******************************************************************************/ +int main(int argc, char **argv) +{ + int i, iy, last_iy, l, t, w, h, Error, NumFiles, ExtCode, + ImageNum = 0, + SizeFlag = FALSE, + ScaleFlag = FALSE, + XScaleFlag = FALSE, + YScaleFlag = FALSE, + HelpFlag = FALSE; + double Scale, y; + GifRecordType RecordType; + char s[80]; + GifByteType *Extension; + GifRowType LineIn, LineOut; + char **FileName = NULL; + GifFileType *GifFileIn = NULL, *GifFileOut = NULL; + + if ((Error = GAGetArgs(argc, argv, CtrlStr, + &GifQuietPrint, &SizeFlag, &XSize, &YSize, &ScaleFlag, &Scale, + &XScaleFlag, &XScale, &YScaleFlag, &YScale, + &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(EXIT_FAILURE); + } + + if (HelpFlag) { + fprintf(stderr, VersionStr); + GAPrintHowTo(CtrlStr); + exit(EXIT_SUCCESS); + } + + /* If specific direction was set, set other direction to 1: */ + if (!XScaleFlag && YScaleFlag) XScale = 1.0; + if (!YScaleFlag && XScaleFlag) YScale = 1.0; + + /* If the specific direction was not set, but global one did use it: */ + if (!XScaleFlag && ScaleFlag) XScale = Scale; + if (!YScaleFlag && ScaleFlag) YScale = Scale; + + if (XScale > MAX_SCALE) { + sprintf(s, "XScale too big, maximum scale selected instead (%f).", + MAX_SCALE); + GIF_MESSAGE(s); + XScale = MAX_SCALE; + } + if (YScale > MAX_SCALE) { + sprintf(s, "YScale too big, maximum scale selected instead (%f).", + MAX_SCALE); + GIF_MESSAGE(s); + YScale = MAX_SCALE; + } + + if (NumFiles == 1) { + if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL) + QuitGifError(GifFileIn, GifFileOut); + } + else { + /* Use the stdin instead: */ + if ((GifFileIn = DGifOpenFileHandle(0)) == NULL) + QuitGifError(GifFileIn, GifFileOut); + } + BackGroundColor = GifFileIn->SBackGroundColor; + + /* If size was specified, it is used to derive the scale: */ + if (SizeFlag) { + XScale = XSize / ((double) GifFileIn->SWidth); + YScale = YSize / ((double) GifFileIn->SHeight); + } + else + { + XSize = (int) (GifFileIn->SWidth * XScale + 0.5); + YSize = (int) (GifFileIn->SHeight * YScale + 0.5); + } + + /* As at this time we know the Screen size of the input gif file, and as */ + /* all image(s) in file must be less/equal to it, we can allocate the */ + /* scan lines for the input file, and output file. The number of lines */ + /* to allocate for each is set by ScaleDown & XScale & YScale: */ + LineOut = (GifRowType) malloc(XSize * sizeof(GifPixelType)); + LineIn = (GifRowType) malloc(GifFileIn->SWidth * sizeof(GifPixelType)); + + /* Open stdout for the output file: */ + if ((GifFileOut = EGifOpenFileHandle(1)) == NULL) + QuitGifError(GifFileIn, GifFileOut); + + /* And dump out its new scaled screen information: */ + if (EGifPutScreenDesc(GifFileOut, XSize, YSize, + GifFileIn->SColorResolution, GifFileIn->SBackGroundColor, + GifFileIn->SColorMap) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + /* Scan the content of the GIF file and load the image(s) in: */ + do { + if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + switch (RecordType) { + case IMAGE_DESC_RECORD_TYPE: + if (DGifGetImageDesc(GifFileIn) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + /* Put the image descriptor to out file: */ + l = (int) (GifFileIn->Image.Left * XScale + 0.5); + w = (int) (GifFileIn->Image.Width * XScale + 0.5); + t = (int) (GifFileIn->Image.Top * YScale + 0.5); + h = (int) (GifFileIn->Image.Height * YScale + 0.5); + if (l < 0) l = 0; + if (t < 0) t = 0; + if (l + w > XSize) w = XSize - l; + if (t + h > YSize) h = YSize - t; + + if (EGifPutImageDesc(GifFileOut, l, t, w, h, + GifFileIn->Image.Interlace, + GifFileIn->Image.ColorMap) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + if (GifFileIn->Image.Interlace) { + GIF_EXIT("Cannt resize interlaced images - use GifInter first."); + } + else { + GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ", + PROGRAM_NAME, ++ImageNum, + GifFileOut->Image.Left, GifFileOut->Image.Top, + GifFileOut->Image.Width, GifFileOut->Image.Height); + + for (i = GifFileIn->Image.Height, y = 0.0, last_iy = -1; + i-- > 0; + y += YScale) { + if (DGifGetLine(GifFileIn, LineIn, + GifFileIn->Image.Width) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + iy = (int) y; + if (last_iy < iy && last_iy < YSize) { + ResizeLine(LineIn, LineOut, + GifFileIn->Image.Width, GifFileOut->Image.Width); + + for (; + last_iy < iy && last_iy < GifFileOut->Image.Height - 1; + last_iy++) { + GifQprintf("\b\b\b\b%-4d", last_iy + 1); + if (EGifPutLine(GifFileOut, LineOut, + GifFileOut->Image.Width) == + GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + } + } + } + + /* If scale is not dividable - dump last lines: */ + while (++last_iy < GifFileOut->Image.Height) { + GifQprintf("\b\b\b\b%-4d", last_iy); + if (EGifPutLine(GifFileOut, LineOut, + GifFileOut->Image.Width) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + } + } + break; + case EXTENSION_RECORD_TYPE: + /* Skip any extension blocks in file: */ + if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + if (EGifPutExtension(GifFileOut, ExtCode, Extension[0], + Extension) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + /* No support to more than one extension blocks, so discard: */ + while (Extension != NULL) { + if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + } + break; + case TERMINATE_RECORD_TYPE: + break; + default: /* Should be traps by DGifGetRecordType. */ + break; + } + } + while (RecordType != TERMINATE_RECORD_TYPE); + + if (DGifCloseFile(GifFileIn) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + if (EGifCloseFile(GifFileOut) == GIF_ERROR) + QuitGifError(GifFileIn, GifFileOut); + + free(LineOut); + free(LineIn); + + return 0; +} + +/****************************************************************************** +* Line resizing routine - scale given lines as follows: * +* Scale (by pixel duplication/elimination) from InLineLen to OutLineLen. * +******************************************************************************/ +static void ResizeLine(GifRowType LineIn, GifRowType LineOut, + int InLineLen, int OutLineLen) +{ + int i, ix, last_ix; + double x; + + OutLineLen--; + + for (i = InLineLen, x = 0.0, last_ix = -1; + i-- > 0; + x += XScale, LineIn++) + { + ix = (int) x; + for (; last_ix < ix && last_ix < OutLineLen; last_ix++) + *LineOut++ = *LineIn; + } + + /* Make sure the line is complete. */ + for (LineIn--; last_ix < OutLineLen; last_ix++) + *LineOut++ = *LineIn; +} + +/****************************************************************************** +* Close both input and output file (if open), and exit. * +******************************************************************************/ +static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut) +{ + PrintGifError(); + if (GifFileIn != NULL) DGifCloseFile(GifFileIn); + if (GifFileOut != NULL) EGifCloseFile(GifFileOut); + exit(EXIT_FAILURE); +} |