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replace int(floor()) with int(), since that produces same results for non-negative values and is much faster on 32-bit x86

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master
Sean Barrett ago%!(EXTRA string=11 years)
parent 1dcca19ae0
commit 9a6af9a8d3
3 changed files with 98 additions and 95 deletions
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  1. 18
      stb_image_resize.h
  2. 2
      tests/resample_test.cpp
  3. 5
      tests/resize.dsp

18
stb_image_resize.h
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@ -1607,6 +1607,8 @@ 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))
switch (decode)
{
case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_LINEAR):
@ -1617,7 +1619,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++)
{
int index = pixel_index + n;
((unsigned char*)output_buffer)[index] = (unsigned char)(floor(stbir__saturate(encode_buffer[index]) * 255 + 0.5f));
((unsigned char*)output_buffer)[index] = (unsigned char) STBIR__ROUND_INT(stbir__saturate(encode_buffer[index]) * 255);
}
}
break;
@ -1634,7 +1636,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
}
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
((unsigned char*)output_buffer)[pixel_index + alpha_channel] = (unsigned char)(floor(stbir__saturate(encode_buffer[pixel_index + alpha_channel]) * 255+0.5f));
((unsigned char*)output_buffer)[pixel_index + alpha_channel] = (unsigned char) STBIR__ROUND_INT(stbir__saturate(encode_buffer[pixel_index + alpha_channel]) * 255);
}
break;
@ -1646,7 +1648,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++)
{
int index = pixel_index + n;
((unsigned short*)output_buffer)[index] = (unsigned short)(floor(stbir__saturate(encode_buffer[index]) * 65535+0.5f));
((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__saturate(encode_buffer[index]) * 65535);
}
}
break;
@ -1659,11 +1661,11 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++)
{
int index = pixel_index + n;
((unsigned short*)output_buffer)[index] = (unsigned short)(floor(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * 65535 + 0.5f));
((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * 65535);
}
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
((unsigned short*)output_buffer)[pixel_index + alpha_channel] = (unsigned short)(floor(stbir__saturate(encode_buffer[pixel_index + alpha_channel]) * 65535 + 0.5f));
((unsigned short*)output_buffer)[pixel_index + alpha_channel] = (unsigned short)STBIR__ROUND_INT(stbir__saturate(encode_buffer[pixel_index + alpha_channel]) * 65535);
}
break;
@ -1676,7 +1678,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++)
{
int index = pixel_index + n;
((unsigned int*)output_buffer)[index] = (unsigned int)(floor(((double)stbir__saturate(encode_buffer[index])) * 4294967295 + 0.5f));
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[index])) * 4294967295);
}
}
break;
@ -1689,11 +1691,11 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < channels; n++)
{
int index = pixel_index + n;
((unsigned int*)output_buffer)[index] = (unsigned int)(floor(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * 4294967295 + 0.5f));
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_INT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * 4294967295);
}
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)(floor(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * 4294967295 + 0.5f));
((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * 4294967295);
}
break;

2
tests/resample_test.cpp
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@ -181,7 +181,7 @@ int main(int argc, char** argv)
int out_w, out_h, out_stride;
//resizer(argc, argv);
//performance(argc, argv);
performance(argc, argv);
#if 1
test_suite(argc, argv);

5
tests/resize.dsp
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@ -39,9 +39,10 @@ RSC=rc.exe
# PROP Use_Debug_Libraries 0
# PROP Output_Dir "Release"
# PROP Intermediate_Dir "Release"
# PROP Ignore_Export_Lib 0
# PROP Target_Dir ""
# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
# ADD CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
# ADD CPP /nologo /W3 /GX /Z7 /O2 /I ".." /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
# ADD BASE RSC /l 0x409 /d "NDEBUG"
# ADD RSC /l 0x409 /d "NDEBUG"
BSC32=bscmake.exe
@ -49,7 +50,7 @@ BSC32=bscmake.exe
# ADD BSC32 /nologo
LINK32=link.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386
!ELSEIF "$(CFG)" == "resize - Win32 Debug"

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