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Try to keep integer precision by briefly casting to double while decoding and encoding.

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This commit is contained in:
Jorge Rodriguez
2014-07-30 01:18:23 -07:00
parent 11897fbf96
commit 6625259959
2 changed files with 8 additions and 8 deletions
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8
stb_resample.h
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@ -715,12 +715,12 @@ static void stbr__decode_scanline(stbr__info* stbr_info, int n)
case STBR__DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = ((float)((const unsigned int*)input_data)[input_texel_index + n]) / 4294967295;
decode_buffer[decode_texel_index + n] = (float)(((double)((const unsigned int*)input_data)[input_texel_index + n]) / 4294967295);
break;
case STBR__DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = stbr__srgb_to_linear(((float)((const unsigned int*)input_data)[input_texel_index + n]) / 4294967295);
decode_buffer[decode_texel_index + n] = stbr__srgb_to_linear((float)(((double)((const unsigned int*)input_data)[input_texel_index + n]) / 4294967295));
break;
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_LINEAR):
@ -913,12 +913,12 @@ static stbr_inline void stbr__encode_scanline(void* output_buffer, int output_te
case STBR__DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
((unsigned int*)output_buffer)[output_texel_index + n] = (unsigned int)(stbr__saturate(encode_buffer[encode_texel_index + n]) * 4294967295);
((unsigned int*)output_buffer)[output_texel_index + n] = (unsigned int)(((double)stbr__saturate(encode_buffer[encode_texel_index + n])) * 4294967295);
break;
case STBR__DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
((unsigned int*)output_buffer)[output_texel_index + n] = (unsigned int)(stbr__linear_to_srgb(stbr__saturate(encode_buffer[encode_texel_index + n])) * 4294967295);
((unsigned int*)output_buffer)[output_texel_index + n] = (unsigned int)(((double)stbr__linear_to_srgb(stbr__saturate(encode_buffer[encode_texel_index + n]))) * 4294967295);
break;
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_LINEAR):