lib/gifwrite.c File Reference

#include "common.h"
#include "memgfx.h"
#include "gifcodes.h"

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Functions
boolean	mgSaveToGif (FILE *gif_file, struct memGfx *screen)
void	mgSaveGif (struct memGfx *screen, char *name)
Variables
static char const	rcsid [] = "$Id: gifwrite.c,v 1.6 2003/05/21 21:02:22 kent Exp $"
static char	gifsig [] = "GIF87a"

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Function Documentation

void mgSaveGif	(	struct memGfx *	screen,
		char *	name
	)

Definition at line 62 of file gifwrite.c.

References errAbort(), errnoAbort(), mgSaveToGif(), and mustOpen().

Referenced by gifLabelVerticalText(), and memGifClose().

{
FILE *gifFile = mustOpen(name, "wb");
if (!mgSaveToGif(gifFile, screen))
    {
    remove(name);
    errAbort("Couldn't save %s", name);
    }
if (fclose(gifFile) != 0)
    errnoAbort("fclose failed");
}

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boolean mgSaveToGif	(	FILE *	gif_file,
		struct memGfx *	screen
	)

Definition at line 12 of file gifwrite.c.

References memGfx::colorMap, COLPIXVGA13, FALSE, gif_image::flags, gif, gif_compress_data(), gif_wcount, gifsig, gim, memGfx::height, gif_image::hhi, gif_image::hlo, memGfx::pixels, TRUE, warn(), gif_image::whi, memGfx::width, gif_image::wlo, gif_image::xhi, gif_image::xlo, gif_image::yhi, gif_image::ylo, and zeroBytes().

Referenced by mgSaveGif().

{
int i;
struct gif_header gif;
struct gif_image gim;
long gif_wcount;

gif_wcount = (long)screen->width * screen->height;
zeroBytes(&gif, sizeof(gif));
strcpy(gif.giftype, gifsig);
gif.wlo = gim.wlo = ((screen->width)&0xff);
gif.whi = gim.whi = ((screen->width>>8)&0xff);
gif.hlo = gim.hlo = ((screen->height)&0xff);
gif.hhi = gim.hhi = ((screen->height>>8)&0xff);
gim.xlo = gim.xhi = gim.ylo = gim.yhi = gim.flags = 0;
gif.colpix = COLPIXVGA13;
if (fwrite(&gif, sizeof(gif), 1, gif_file ) < 1)
    goto TRUNCOUT;
/* write global color map */
if (fwrite(screen->colorMap, 3, 256, gif_file) < 256)
    goto TRUNCOUT;
if (fputc(',', gif_file) < 0) /* comma to start image */
    goto TRUNCOUT;
if (fwrite(&gim, sizeof(gim), 1, gif_file) < 1)
    goto TRUNCOUT;
fputc(8,gif_file);
fflush(gif_file);
i = gif_compress_data(8, screen->pixels, gif_wcount, gif_file);
switch (i)
    {
    case 0:
        break;
    case -2:
        warn("Out of memory writing GIF");
        goto BADOUT;
    case -3:
        goto TRUNCOUT;
    default:
        warn("Error code %d writing gif", i);
        goto BADOUT;
    }
fputc(';', gif_file); /* end of file for gif */
return(TRUE);
TRUNCOUT:
warn("Disk full writing GIF");
BADOUT:
return(FALSE);
}

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Variable Documentation

char gifsig[] = "GIF87a" [static]

Definition at line 9 of file gifwrite.c.

Referenced by mgSaveToGif().

char const rcsid[] = "$Id: gifwrite.c,v 1.6 2003/05/21 21:02:22 kent Exp $" [static]

Definition at line 7 of file gifwrite.c.

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