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Added option to flip image on encode #211

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Added option to flip image on encode #211

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6 changes: 5 additions & 1 deletion spng/spng.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4863,7 +4863,11 @@ int spng_encode_image(spng_ctx *ctx, const void *img, size_t len, int fmt, int f

do
{
size_t ioffset = ri->row_num * ctx->image_width;
size_t ioffset;
if ( flags & SPNG_ENCODE_FLIP_Y )
ioffset = ( ihdr->height - ri->row_num - 1 ) * ctx->image_width;
else
ioffset = ri->row_num * ctx->image_width;

ret = encode_row(ctx, (unsigned char*)img + ioffset, ctx->image_width);

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1 change: 1 addition & 0 deletions spng/spng.h
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Expand Up @@ -216,6 +216,7 @@ enum spng_encode_flags
{
SPNG_ENCODE_PROGRESSIVE = 1, /* Initialize for progressive writes */
SPNG_ENCODE_FINALIZE = 2, /* Finalize PNG after encoding image */
SPNG_ENCODE_FLIP_Y = 4, /* Flip image vertically */
};

struct spng_ihdr
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