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Enable loop #19

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41a7224
Enable loop
andrey-moura Dec 13, 2020
3fa5f44
Loop variable comment
andrey-moura Dec 14, 2020
65a6ce7
Update gif.h
andrey-moura Dec 16, 2020
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12 changes: 7 additions & 5 deletions gif.h
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Original file line number Diff line number Diff line change
Expand Up @@ -734,8 +734,10 @@ typedef struct

// Creates a gif file.
// The input GIFWriter is assumed to be uninitialized.
// The delay value is the time between frames in hundredths of a second - note that not all viewers pay much attention to this value.
bool GifBegin( GifWriter* writer, const char* filename, uint32_t width, uint32_t height, uint32_t delay, int32_t bitDepth = 8, bool dither = false )
// The delay value is the time between frames in hundredths of a second.
// The repeat value is the number of times the sequence should be repeated (1 to 65535 times) or loop when repeat is zero.
// Note that not all viewers pay much attention to these values.
bool GifBegin( GifWriter* writer, const char* filename, uint32_t width, uint32_t height, uint32_t delay, int32_t bitDepth = 8, bool dither = false, uint16_t repeat = 0)
{
(void)bitDepth; (void)dither; // Mute "Unused argument" warnings
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
Expand Down Expand Up @@ -773,7 +775,7 @@ bool GifBegin( GifWriter* writer, const char* filename, uint32_t width, uint32_t
fputc(0, writer->f);
fputc(0, writer->f);

if( delay != 0 )
if( delay != 0 || repeat != 0 )
{
// animation header
fputc(0x21, writer->f); // extension
Expand All @@ -783,8 +785,8 @@ bool GifBegin( GifWriter* writer, const char* filename, uint32_t width, uint32_t
fputc(3, writer->f); // 3 bytes of NETSCAPE2.0 data

fputc(1, writer->f); // JUST BECAUSE
fputc(0, writer->f); // loop infinitely (byte 0)
fputc(0, writer->f); // loop infinitely (byte 1)
fputc(repeat & 0xFF, writer->f); // repeat (byte 0)
fputc((repeat & 0xFF00) >> 8, writer->f); // repeat (byte 1)

fputc(0, writer->f); // block terminator
}
Expand Down