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Implement --lossy LZW compression #72

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Implement --lossy LZW compression #72

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4b60d90
Implement --lossy LZW compression
kornelski Jul 17, 2016
0070caa
Unused const
kornelski Nov 29, 2016
2f0b73c
NULL
kornelski Nov 29, 2016
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1 change: 1 addition & 0 deletions include/lcdfgif/gif.h
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,7 @@ typedef void (*Gif_ReadErrorHandler)(Gif_Stream* gfs,

typedef struct {
int flags;
int loss;
void *padding[7];
} Gif_CompressInfo;

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1 change: 1 addition & 0 deletions src/giffunc.c
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Expand Up @@ -818,6 +818,7 @@ void
Gif_InitCompressInfo(Gif_CompressInfo *gcinfo)
{
gcinfo->flags = 0;
gcinfo->loss = 0;
}


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9 changes: 9 additions & 0 deletions src/gifsicle.c
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Expand Up @@ -197,6 +197,7 @@ static const char *output_option_types[] = {
#define SAME_APP_EXTENSIONS_OPT 373
#define IGNORE_ERRORS_OPT 374
#define THREADS_OPT 375
#define LOSSY_OPT 376

#define LOOP_TYPE (Clp_ValFirstUser)
#define DISPOSAL_TYPE (Clp_ValFirstUser + 1)
Expand Down Expand Up @@ -264,6 +265,7 @@ const Clp_Option options[] = {

{ "logical-screen", 'S', LOGICAL_SCREEN_OPT, DIMENSIONS_TYPE, Clp_Negate },
{ "loopcount", 'l', 'l', LOOP_TYPE, Clp_Optional | Clp_Negate },
{ "lossy", 0, LOSSY_OPT, Clp_ValInt, Clp_Optional },

{ "merge", 'm', 'm', 0, 0 },
{ "method", 0, COLORMAP_ALGORITHM_OPT, COLORMAP_ALG_TYPE, 0 },
Expand Down Expand Up @@ -1944,6 +1946,13 @@ main(int argc, char *argv[])
}
break;

case LOSSY_OPT:
if (clp->have_val)
gif_write_info.loss = clp->val.i;
else
gif_write_info.loss = 20;
break;

/* RANDOM OPTIONS */

case NO_WARNINGS_OPT:
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