anulax
/
stb
1
0
Fork 0
Code Issues Pull Requests Packages project_board Releases Wiki Activity

This is still faster than the function pointer solution, and neater.

Browse Source
master
Jorge Rodriguez ago%!(EXTRA string=11 years)
parent 3a3e06029e
commit d96c97298c
1 changed files with 51 additions and 143 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 192
      stb_resample.h

192
stb_resample.h
Unescape View File

@ -597,7 +597,7 @@ static float* stbr__get_decode_buffer(stbr__info* stbr_info)
return &stbr_info->decode_buffer[stbr__get_filter_texel_margin(stbr_info->filter) * stbr_info->channels];
}
#define DECODE(type, colorspace) ((type) * (STBR_MAX_COLORSPACES) + (colorspace))
#define STBR__DECODE(type, colorspace) ((type) * (STBR_MAX_COLORSPACES) + (colorspace))
static void stbr__decode_scanline(stbr__info* stbr_info, int n)
{
@ -612,7 +612,7 @@ static void stbr__decode_scanline(stbr__info* stbr_info, int n)
stbr_edge edge = stbr_info->edge;
int in_buffer_row_index = stbr__edge_wrap(edge, n, stbr_info->input_h) * input_stride_bytes;
int max_x = input_w + stbr__get_filter_texel_margin(stbr_info->filter);
int decode = DECODE(type, colorspace);
int decode = STBR__DECODE(type, colorspace);
for (x = -stbr__get_filter_texel_margin(stbr_info->filter); x < max_x; x++)
{
@ -621,42 +621,42 @@ static void stbr__decode_scanline(stbr__info* stbr_info, int n)
switch (decode)
{
case DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_LINEAR):
case STBR__DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = ((float)((const unsigned char*)input_data)[input_texel_index + n]) / 255;
break;
case DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_SRGB):
case STBR__DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = stbr__srgb_uchar_to_linear_float[((const unsigned char*)input_data)[input_texel_index + n]];
break;
case DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_LINEAR):
case STBR__DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = ((float)((const unsigned short*)input_data)[input_texel_index + n]) / 65535;
break;
case DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_SRGB):
case STBR__DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = stbr__srgb_to_linear(((float)((const unsigned short*)input_data)[input_texel_index + n]) / 65535);
break;
case DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_LINEAR):
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;
break;
case DECODE(STBR_TYPE_UINT32, STBR_COLORSPACE_SRGB):
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);
break;
case DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_LINEAR):
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = ((const float*)input_data)[input_texel_index + n];
break;
case DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_SRGB):
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
decode_buffer[decode_texel_index + n] = stbr__srgb_to_linear(((const float*)input_data)[input_texel_index + n]);
break;
@ -668,8 +668,6 @@ static void stbr__decode_scanline(stbr__info* stbr_info, int n)
}
}
#undef DECODE
static float* stbr__get_ring_buffer_entry(float* ring_buffer, int index, int ring_buffer_length)
{
return &ring_buffer[index * ring_buffer_length];
@ -817,144 +815,54 @@ static float* stbr__get_ring_buffer_scanline(int get_scanline, float* ring_buffe
}
typedef void(*stbr__encode_scanline_type_colorspace)(const void* buffer, int offset, int channel, float value);
static void stbr__encode_scanline_uchar_sRGB(const void* buffer, int offset, int channel, float value)
{
((unsigned char*)buffer)[offset + channel] = stbr__linear_uchar_to_srgb_uchar[(unsigned char)(stbr__saturate(value)*255)];
}
static void stbr__encode_scanline_uchar_linear(const void* buffer, int offset, int channel, float value)
{
((unsigned char*)buffer)[offset + channel] = (unsigned char)(stbr__saturate(value) * 255);
}
static void stbr__encode_scanline_ushort_sRGB(const void* buffer, int offset, int channel, float value)
{
((unsigned short*)buffer)[offset + channel] = (unsigned short)stbr__linear_to_srgb((stbr__saturate(value) * 65535));
}
static void stbr__encode_scanline_ushort_linear(const void* buffer, int offset, int channel, float value)
{
((unsigned short*)buffer)[offset + channel] = (unsigned short)(stbr__saturate(value) * 65535);
}
static void stbr__encode_scanline_uint_sRGB(const void* buffer, int offset, int channel, float value)
static stbr_inline void stbr__encode_scanline(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, int decode)
{
((unsigned int*)buffer)[offset + channel] = (unsigned int)stbr__linear_to_srgb((stbr__saturate(value) * 4294967295));
}
static void stbr__encode_scanline_uint_linear(const void* buffer, int offset, int channel, float value)
{
((unsigned int*)buffer)[offset + channel] = (unsigned int)(stbr__saturate(value) * 4294967295);
}
static void stbr__encode_scanline_float_sRGB(const void* buffer, int offset, int channel, float value)
{
((float*)buffer)[offset + channel] = stbr__linear_to_srgb(stbr__saturate(value));
}
static void stbr__encode_scanline_float_linear(const void* buffer, int offset, int channel, float value)
{
((float*)buffer)[offset + channel] = stbr__saturate(value);
}
typedef void(*stbr__encode_scanline_channels)(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace);
static void stbr__encode_scanline_1(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace)
{
STBR_DEBUG_ASSERT(channels == 1);
encode_type_colorspace(output_buffer, output_texel_index, 0, encode_buffer[encode_texel_index]);
}
static void stbr__encode_scanline_2(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace)
{
STBR_DEBUG_ASSERT(channels == 2);
encode_type_colorspace(output_buffer, output_texel_index, 0, encode_buffer[encode_texel_index]);
encode_type_colorspace(output_buffer, output_texel_index, 1, encode_buffer[encode_texel_index + 1]);
}
static void stbr__encode_scanline_3(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace)
switch (decode)
{
STBR_DEBUG_ASSERT(channels == 3);
encode_type_colorspace(output_buffer, output_texel_index, 0, encode_buffer[encode_texel_index]);
encode_type_colorspace(output_buffer, output_texel_index, 1, encode_buffer[encode_texel_index + 1]);
encode_type_colorspace(output_buffer, output_texel_index, 2, encode_buffer[encode_texel_index + 2]);
}
case STBR__DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
((unsigned char*)output_buffer)[output_texel_index + n] = (unsigned char)(stbr__saturate(encode_buffer[encode_texel_index + n]) * 255);
break;
static void stbr__encode_scanline_4(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace)
{
STBR_DEBUG_ASSERT(channels == 4);
case STBR__DECODE(STBR_TYPE_UINT8, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
((unsigned char*)output_buffer)[output_texel_index + n] = stbr__linear_uchar_to_srgb_uchar[(unsigned char)(stbr__saturate(encode_buffer[encode_texel_index + n]) * 255)];
break;
encode_type_colorspace(output_buffer, output_texel_index, 0, encode_buffer[encode_texel_index]);
encode_type_colorspace(output_buffer, output_texel_index, 1, encode_buffer[encode_texel_index + 1]);
encode_type_colorspace(output_buffer, output_texel_index, 2, encode_buffer[encode_texel_index + 2]);
encode_type_colorspace(output_buffer, output_texel_index, 3, encode_buffer[encode_texel_index + 3]);
}
case STBR__DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
((unsigned short*)output_buffer)[output_texel_index + n] = (unsigned short)(stbr__saturate(encode_buffer[encode_texel_index + n]) * 65535);
break;
static void stbr__encode_scanline_n(void* output_buffer, int output_texel_index, float* encode_buffer, int encode_texel_index, int channels, stbr__encode_scanline_type_colorspace encode_type_colorspace)
{
int c;
for (c = 0; c < channels; c++)
encode_type_colorspace(output_buffer, output_texel_index, c, encode_buffer[encode_texel_index + c]);
}
case STBR__DECODE(STBR_TYPE_UINT16, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
((unsigned short*)output_buffer)[output_texel_index + n] = (unsigned short)stbr__linear_to_srgb((stbr__saturate(encode_buffer[encode_texel_index + n]) * 65535));
break;
static stbr__encode_scanline_type_colorspace stbr__get_encode_type_colorspace_function(stbr_type type, stbr_colorspace colorspace)
{
switch (type)
{
case STBR_TYPE_UINT8:
if (colorspace == STBR_COLORSPACE_LINEAR)
return stbr__encode_scanline_uchar_linear;
else if (colorspace == STBR_COLORSPACE_SRGB)
return stbr__encode_scanline_uchar_sRGB;
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);
break;
case STBR_TYPE_UINT16:
if (colorspace == STBR_COLORSPACE_LINEAR)
return stbr__encode_scanline_ushort_linear;
else if (colorspace == STBR_COLORSPACE_SRGB)
return stbr__encode_scanline_ushort_sRGB;
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));
break;
case STBR_TYPE_UINT32:
if (colorspace == STBR_COLORSPACE_LINEAR)
return stbr__encode_scanline_uint_linear;
else if (colorspace == STBR_COLORSPACE_SRGB)
return stbr__encode_scanline_uint_sRGB;
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_LINEAR):
for (int n = 0; n < channels; n++)
((float*)output_buffer)[output_texel_index + n] = stbr__saturate(encode_buffer[encode_texel_index + n]);
break;
case STBR_TYPE_FLOAT:
if (colorspace == STBR_COLORSPACE_LINEAR)
return stbr__encode_scanline_float_linear;
else if (colorspace == STBR_COLORSPACE_SRGB)
return stbr__encode_scanline_float_sRGB;
case STBR__DECODE(STBR_TYPE_FLOAT, STBR_COLORSPACE_SRGB):
for (int n = 0; n < channels; n++)
((float*)output_buffer)[output_texel_index + n] = stbr__linear_to_srgb(stbr__saturate(encode_buffer[encode_texel_index + n]));
break;
default:
STBR_UNIMPLEMENTED("Unknown type.");
return NULL;
STBR_UNIMPLEMENTED("Unknown type/colorspace/channels combination.");
break;
}
STBR_UNIMPLEMENTED("Unknown color space.");
return NULL;
}
static stbr__encode_scanline_channels stbr__get_encode_channels_function(int channels)
{
if (channels == 1)
return &stbr__encode_scanline_1;
else if (channels == 2)
return &stbr__encode_scanline_2;
else if (channels == 3)
return &stbr__encode_scanline_3;
else if (channels == 4)
return &stbr__encode_scanline_4;
return &stbr__encode_scanline_n;
}
static void stbr__resample_vertical_upsample(stbr__info* stbr_info, int n, int in_first_scanline, int in_last_scanline, float in_center_of_out)
@ -964,9 +872,12 @@ static void stbr__resample_vertical_upsample(stbr__info* stbr_info, int n, int i
stbr__contributors* vertical_contributors = &stbr_info->vertical_contributors;
float* vertical_coefficients = stbr_info->vertical_coefficients;
int channels = stbr_info->channels;
int type = stbr_info->type;
int colorspace = stbr_info->colorspace;
int kernel_texel_width = stbr__get_filter_texel_width(stbr_info->filter);
void* output_data = stbr_info->output_data;
float* encode_buffer = stbr_info->encode_buffer;
int decode = STBR__DECODE(type, colorspace);
float* ring_buffer = stbr_info->ring_buffer;
int ring_buffer_begin_index = stbr_info->ring_buffer_begin_index;
@ -983,9 +894,6 @@ static void stbr__resample_vertical_upsample(stbr__info* stbr_info, int n, int i
int output_row_index = n * stbr_info->output_stride_bytes;
stbr__encode_scanline_channels encode_channels_fn = stbr__get_encode_channels_function(channels);
stbr__encode_scanline_type_colorspace encode_type_colorspace_fn = stbr__get_encode_type_colorspace_function(stbr_info->type, stbr_info->colorspace);
STBR_DEBUG_ASSERT(stbr__use_height_upsampling(stbr_info));
STBR_DEBUG_ASSERT(n0 >= in_first_scanline);
STBR_DEBUG_ASSERT(n1 <= in_last_scanline);
@ -1011,7 +919,7 @@ static void stbr__resample_vertical_upsample(stbr__info* stbr_info, int n, int i
encode_buffer[c] += ring_buffer_entry[in_texel_index + c] * coefficient;
}
encode_channels_fn(output_data, out_texel_index, encode_buffer, 0, channels, encode_type_colorspace_fn);
stbr__encode_scanline(output_data, out_texel_index, encode_buffer, 0, channels, decode);
}
}
@ -1120,15 +1028,15 @@ static void stbr__empty_ring_buffer(stbr__info* stbr_info, int first_necessary_s
{
int output_stride_bytes = stbr_info->output_stride_bytes;
int channels = stbr_info->channels;
int type = stbr_info->type;
int colorspace = stbr_info->colorspace;
int output_w = stbr_info->output_w;
void* output_data = stbr_info->output_data;
int decode = STBR__DECODE(type, colorspace);
float* ring_buffer = stbr_info->ring_buffer;
int ring_buffer_length = stbr_info->ring_buffer_length_bytes/sizeof(float);
stbr__encode_scanline_channels encode_channels_fn = stbr__get_encode_channels_function(channels);
stbr__encode_scanline_type_colorspace encode_type_colorspace_fn = stbr__get_encode_type_colorspace_function(stbr_info->type, stbr_info->colorspace);
if (stbr_info->ring_buffer_begin_index >= 0)
{
// Get rid of whatever we don't need anymore.
@ -1148,7 +1056,7 @@ static void stbr__empty_ring_buffer(stbr__info* stbr_info, int first_necessary_s
int ring_texel_index = texel_index;
int output_texel_index = output_row + texel_index;
encode_channels_fn(output_data, output_texel_index, ring_buffer_entry, ring_texel_index, channels, encode_type_colorspace_fn);
stbr__encode_scanline(output_data, output_texel_index, ring_buffer_entry, ring_texel_index, channels, decode);
}
}

Write Preview
Loading…
Cancel
Save