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uint32 images need to round with uint32 cast, not int cast

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This commit is contained in:
Sean Barrett 2014-09-14 15:01:10 -07:00
parent 9f66b441bd
commit bdbf1e0ef4
1 changed files with 4 additions and 3 deletions
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7
stb_image_resize.h
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@ -1613,7 +1613,8 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
} }
} }
#define STBIR__ROUND_INT(f) ((int) ((f)+0.5)) //#define STBIR__ROUND_INT(f) (floor((f)+0.5)) #define STBIR__ROUND_INT(f) ((int) ((f)+0.5))
#define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5))
switch (decode) switch (decode)
{ {
@ -1684,7 +1685,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++) for (n = 0; n < channels; n++)
{ {
int index = pixel_index + n; int index = pixel_index + n;
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[index])) * 4294967295); ((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__saturate(encode_buffer[index])) * 4294967295);
} }
} }
break; break;
@ -1697,7 +1698,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++) for (n = 0; n < channels; n++)
{ {
int index = pixel_index + n; int index = pixel_index + n;
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_INT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * 4294967295); ((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * 4294967295);
} }
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))