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Sean Barrett 2017-03-18 18:55:20 -07:00
commit 2549ffcd82
3 changed files with 63 additions and 59 deletions
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stb_image_resize.h
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@ -1,4 +1,4 @@
/* stb_image_resize - v0.93 - public domain image resizing /* stb_image_resize - v0.94 - public domain image resizing
by Jorge L Rodriguez (@VinoBS) - 2014 by Jorge L Rodriguez (@VinoBS) - 2014
http://github.com/nothings/stb http://github.com/nothings/stb
@ -107,8 +107,8 @@
industry, it is still uncommon in the videogame/real-time world. industry, it is still uncommon in the videogame/real-time world.
If you linearly filter non-premultiplied alpha, strange effects If you linearly filter non-premultiplied alpha, strange effects
occur. (For example, the average of 1% opaque bright green occur. (For example, the 50/50 average of 99% transparent bright green
and 99% opaque black produces 50% transparent dark green when and 1% transparent black produces 50% transparent dark green when
non-premultiplied, whereas premultiplied it produces 50% non-premultiplied, whereas premultiplied it produces 50%
transparent near-black. The former introduces green energy transparent near-black. The former introduces green energy
that doesn't exist in the source image.) that doesn't exist in the source image.)
@ -152,18 +152,19 @@
(For example, graphics hardware does not apply sRGB conversion (For example, graphics hardware does not apply sRGB conversion
to the alpha channel.) to the alpha channel.)
ADDITIONAL CONTRIBUTORS CONTRIBUTORS
Jorge L Rodriguez: Implementation
Sean Barrett: API design, optimizations Sean Barrett: API design, optimizations
Aras Pranckevicius: bugfix Aras Pranckevicius: bugfix
REVISIONS REVISIONS
0.94 (2017-03-18) fixed warnings
0.93 (2017-03-03) fixed bug with certain combinations of heights 0.93 (2017-03-03) fixed bug with certain combinations of heights
0.92 (2017-01-02) fix integer overflow on large (>2GB) images 0.92 (2017-01-02) fix integer overflow on large (>2GB) images
0.91 (2016-04-02) fix warnings; fix handling of subpixel regions 0.91 (2016-04-02) fix warnings; fix handling of subpixel regions
0.90 (2014-09-17) first released version 0.90 (2014-09-17) first released version
LICENSE LICENSE
See end of file for license information. See end of file for license information.
TODO TODO
@ -551,16 +552,17 @@ typedef struct
int encode_buffer_size; int encode_buffer_size;
} stbir__info; } stbir__info;
static const float stbir__max_uint8_as_float = 255.0f;
static const float stbir__max_uint16_as_float = 65535.0f;
static const double stbir__max_uint32_as_float = 4294967295.0;
static stbir__inline int stbir__min(int a, int b) static stbir__inline int stbir__min(int a, int b)
{ {
return a < b ? a : b; return a < b ? a : b;
} }
static stbir__inline int stbir__max(int a, int b)
{
return a > b ? a : b;
}
static stbir__inline float stbir__saturate(float x) static stbir__inline float stbir__saturate(float x)
{ {
if (x < 0) if (x < 0)
@ -1027,7 +1029,7 @@ static void stbir__calculate_sample_range_downsample(int n, float in_pixels_radi
*out_last_pixel = (int)(floor(out_pixel_influence_upperbound - 0.5)); *out_last_pixel = (int)(floor(out_pixel_influence_upperbound - 0.5));
} }
static void stbir__calculate_coefficients_upsample(stbir__info* stbir_info, stbir_filter filter, float scale, int in_first_pixel, int in_last_pixel, float in_center_of_out, stbir__contributors* contributor, float* coefficient_group) static void stbir__calculate_coefficients_upsample(stbir_filter filter, float scale, int in_first_pixel, int in_last_pixel, float in_center_of_out, stbir__contributors* contributor, float* coefficient_group)
{ {
int i; int i;
float total_filter = 0; float total_filter = 0;
@ -1077,7 +1079,7 @@ static void stbir__calculate_coefficients_upsample(stbir__info* stbir_info, stbi
} }
} }
static void stbir__calculate_coefficients_downsample(stbir__info* stbir_info, stbir_filter filter, float scale_ratio, int out_first_pixel, int out_last_pixel, float out_center_of_in, stbir__contributors* contributor, float* coefficient_group) static void stbir__calculate_coefficients_downsample(stbir_filter filter, float scale_ratio, int out_first_pixel, int out_last_pixel, float out_center_of_in, stbir__contributors* contributor, float* coefficient_group)
{ {
int i; int i;
@ -1107,7 +1109,7 @@ static void stbir__calculate_coefficients_downsample(stbir__info* stbir_info, st
} }
} }
static void stbir__normalize_downsample_coefficients(stbir__info* stbir_info, stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size) static void stbir__normalize_downsample_coefficients(stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, int input_size, int output_size)
{ {
int num_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size); int num_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size);
int num_coefficients = stbir__get_coefficient_width(filter, scale_ratio); int num_coefficients = stbir__get_coefficient_width(filter, scale_ratio);
@ -1184,7 +1186,7 @@ static void stbir__normalize_downsample_coefficients(stbir__info* stbir_info, st
// Each scan line uses the same kernel values so we should calculate the kernel // Each scan line uses the same kernel values so we should calculate the kernel
// values once and then we can use them for every scan line. // values once and then we can use them for every scan line.
static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size) static void stbir__calculate_filters(stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size)
{ {
int n; int n;
int total_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size); int total_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size);
@ -1201,7 +1203,7 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor
stbir__calculate_sample_range_upsample(n, out_pixels_radius, scale_ratio, shift, &in_first_pixel, &in_last_pixel, &in_center_of_out); stbir__calculate_sample_range_upsample(n, out_pixels_radius, scale_ratio, shift, &in_first_pixel, &in_last_pixel, &in_center_of_out);
stbir__calculate_coefficients_upsample(stbir_info, filter, scale_ratio, in_first_pixel, in_last_pixel, in_center_of_out, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); stbir__calculate_coefficients_upsample(filter, scale_ratio, in_first_pixel, in_last_pixel, in_center_of_out, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0));
} }
} }
else else
@ -1217,10 +1219,10 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor
stbir__calculate_sample_range_downsample(n_adjusted, in_pixels_radius, scale_ratio, shift, &out_first_pixel, &out_last_pixel, &out_center_of_in); stbir__calculate_sample_range_downsample(n_adjusted, in_pixels_radius, scale_ratio, shift, &out_first_pixel, &out_last_pixel, &out_center_of_in);
stbir__calculate_coefficients_downsample(stbir_info, filter, scale_ratio, out_first_pixel, out_last_pixel, out_center_of_in, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); stbir__calculate_coefficients_downsample(filter, scale_ratio, out_first_pixel, out_last_pixel, out_center_of_in, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0));
} }
stbir__normalize_downsample_coefficients(stbir_info, contributors, coefficients, filter, scale_ratio, shift, input_size, output_size); stbir__normalize_downsample_coefficients(contributors, coefficients, filter, scale_ratio, input_size, output_size);
} }
} }
@ -1270,7 +1272,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int decode_pixel_index = x * channels; int decode_pixel_index = x * channels;
int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels;
for (c = 0; c < channels; c++) for (c = 0; c < channels; c++)
decode_buffer[decode_pixel_index + c] = ((float)((const unsigned char*)input_data)[input_pixel_index + c]) / 255; decode_buffer[decode_pixel_index + c] = ((float)((const unsigned char*)input_data)[input_pixel_index + c]) / stbir__max_uint8_as_float;
} }
break; break;
@ -1283,7 +1285,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
decode_buffer[decode_pixel_index + c] = stbir__srgb_uchar_to_linear_float[((const unsigned char*)input_data)[input_pixel_index + c]]; decode_buffer[decode_pixel_index + c] = stbir__srgb_uchar_to_linear_float[((const unsigned char*)input_data)[input_pixel_index + c]];
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned char*)input_data)[input_pixel_index + alpha_channel]) / 255; decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned char*)input_data)[input_pixel_index + alpha_channel]) / stbir__max_uint8_as_float;
} }
break; break;
@ -1293,7 +1295,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int decode_pixel_index = x * channels; int decode_pixel_index = x * channels;
int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels;
for (c = 0; c < channels; c++) for (c = 0; c < channels; c++)
decode_buffer[decode_pixel_index + c] = ((float)((const unsigned short*)input_data)[input_pixel_index + c]) / 65535; decode_buffer[decode_pixel_index + c] = ((float)((const unsigned short*)input_data)[input_pixel_index + c]) / stbir__max_uint16_as_float;
} }
break; break;
@ -1303,10 +1305,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int decode_pixel_index = x * channels; int decode_pixel_index = x * channels;
int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels;
for (c = 0; c < channels; c++) for (c = 0; c < channels; c++)
decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear(((float)((const unsigned short*)input_data)[input_pixel_index + c]) / 65535); decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear(((float)((const unsigned short*)input_data)[input_pixel_index + c]) / stbir__max_uint16_as_float);
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned short*)input_data)[input_pixel_index + alpha_channel]) / 65535; decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned short*)input_data)[input_pixel_index + alpha_channel]) / stbir__max_uint16_as_float;
} }
break; break;
@ -1316,7 +1318,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int decode_pixel_index = x * channels; int decode_pixel_index = x * channels;
int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels;
for (c = 0; c < channels; c++) for (c = 0; c < channels; c++)
decode_buffer[decode_pixel_index + c] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / 4294967295); decode_buffer[decode_pixel_index + c] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / stbir__max_uint32_as_float);
} }
break; break;
@ -1326,10 +1328,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int decode_pixel_index = x * channels; int decode_pixel_index = x * channels;
int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels;
for (c = 0; c < channels; c++) for (c = 0; c < channels; c++)
decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear((float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / 4294967295)); decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear((float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / stbir__max_uint32_as_float));
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
decode_buffer[decode_pixel_index + alpha_channel] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + alpha_channel]) / 4294967295); decode_buffer[decode_pixel_index + alpha_channel] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + alpha_channel]) / stbir__max_uint32_as_float);
} }
break; break;
@ -1431,11 +1433,10 @@ static float* stbir__add_empty_ring_buffer_entry(stbir__info* stbir_info, int n)
} }
static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, int n, float* output_buffer) static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, float* output_buffer)
{ {
int x, k; int x, k;
int output_w = stbir_info->output_w; int output_w = stbir_info->output_w;
int kernel_pixel_width = stbir_info->horizontal_filter_pixel_width;
int channels = stbir_info->channels; int channels = stbir_info->channels;
float* decode_buffer = stbir__get_decode_buffer(stbir_info); float* decode_buffer = stbir__get_decode_buffer(stbir_info);
stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors; stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors;
@ -1515,12 +1516,10 @@ static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, int n,
} }
} }
static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, int n, float* output_buffer) static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float* output_buffer)
{ {
int x, k; int x, k;
int input_w = stbir_info->input_w; int input_w = stbir_info->input_w;
int output_w = stbir_info->output_w;
int kernel_pixel_width = stbir_info->horizontal_filter_pixel_width;
int channels = stbir_info->channels; int channels = stbir_info->channels;
float* decode_buffer = stbir__get_decode_buffer(stbir_info); float* decode_buffer = stbir__get_decode_buffer(stbir_info);
stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors; stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors;
@ -1654,9 +1653,9 @@ static void stbir__decode_and_resample_upsample(stbir__info* stbir_info, int n)
// Now resample it into the ring buffer. // Now resample it into the ring buffer.
if (stbir__use_width_upsampling(stbir_info)) if (stbir__use_width_upsampling(stbir_info))
stbir__resample_horizontal_upsample(stbir_info, n, stbir__add_empty_ring_buffer_entry(stbir_info, n)); stbir__resample_horizontal_upsample(stbir_info, stbir__add_empty_ring_buffer_entry(stbir_info, n));
else else
stbir__resample_horizontal_downsample(stbir_info, n, stbir__add_empty_ring_buffer_entry(stbir_info, n)); stbir__resample_horizontal_downsample(stbir_info, stbir__add_empty_ring_buffer_entry(stbir_info, n));
// Now it's sitting in the ring buffer ready to be used as source for the vertical sampling. // Now it's sitting in the ring buffer ready to be used as source for the vertical sampling.
} }
@ -1670,9 +1669,9 @@ static void stbir__decode_and_resample_downsample(stbir__info* stbir_info, int n
// Now resample it into the horizontal buffer. // Now resample it into the horizontal buffer.
if (stbir__use_width_upsampling(stbir_info)) if (stbir__use_width_upsampling(stbir_info))
stbir__resample_horizontal_upsample(stbir_info, n, stbir_info->horizontal_buffer); stbir__resample_horizontal_upsample(stbir_info, stbir_info->horizontal_buffer);
else else
stbir__resample_horizontal_downsample(stbir_info, n, stbir_info->horizontal_buffer); stbir__resample_horizontal_downsample(stbir_info, stbir_info->horizontal_buffer);
// Now it's sitting in the horizontal buffer ready to be distributed into the ring buffers. // Now it's sitting in the horizontal buffer ready to be distributed into the ring buffers.
} }
@ -1715,19 +1714,23 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
// build a table of all channels that need colorspace correction, so // build a table of all channels that need colorspace correction, so
// we don't perform colorspace correction on channels that don't need it. // we don't perform colorspace correction on channels that don't need it.
for (x=0, num_nonalpha=0; x < channels; ++x) for (x = 0, num_nonalpha = 0; x < channels; ++x)
{
if (x != alpha_channel || (stbir_info->flags & STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (x != alpha_channel || (stbir_info->flags & STBIR_FLAG_ALPHA_USES_COLORSPACE))
nonalpha[num_nonalpha++] = x; {
nonalpha[num_nonalpha++] = (stbir_uint16)x;
}
}
#define STBIR__ROUND_INT(f) ((int) ((f)+0.5)) #define STBIR__ROUND_INT(f) ((int) ((f)+0.5))
#define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5)) #define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5))
#ifdef STBIR__SATURATE_INT #ifdef STBIR__SATURATE_INT
#define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) * 255 )) #define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) * stbir__max_uint8_as_float ))
#define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) * 65535)) #define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) * stbir__max_uint16_as_float))
#else #else
#define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) * 255 ) #define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint8_as_float )
#define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) * 65535) #define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint16_as_float)
#endif #endif
switch (decode) switch (decode)
@ -1782,7 +1785,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < num_nonalpha; n++) for (n = 0; n < num_nonalpha; n++)
{ {
int index = pixel_index + nonalpha[n]; int index = pixel_index + nonalpha[n];
((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * 65535); ((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * stbir__max_uint16_as_float);
} }
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
@ -1799,7 +1802,7 @@ 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_UINT(((double)stbir__saturate(encode_buffer[index])) * 4294967295); ((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__saturate(encode_buffer[index])) * stbir__max_uint32_as_float);
} }
} }
break; break;
@ -1812,11 +1815,11 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for (n = 0; n < num_nonalpha; n++) for (n = 0; n < num_nonalpha; n++)
{ {
int index = pixel_index + nonalpha[n]; int index = pixel_index + nonalpha[n];
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((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]))) * stbir__max_uint32_as_float);
} }
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * 4294967295); ((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * stbir__max_uint32_as_float);
} }
break; break;
@ -1855,7 +1858,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
} }
} }
static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, int in_first_scanline, int in_last_scanline, float in_center_of_out) static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n)
{ {
int x, k; int x, k;
int output_w = stbir_info->output_w; int output_w = stbir_info->output_w;
@ -1876,7 +1879,6 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in
float* ring_buffer = stbir_info->ring_buffer; float* ring_buffer = stbir_info->ring_buffer;
int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index; int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index;
int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline; int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline;
int ring_buffer_last_scanline = stbir_info->ring_buffer_last_scanline;
int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float); int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float);
int n0,n1, output_row_start; int n0,n1, output_row_start;
@ -1973,16 +1975,14 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in
stbir__encode_scanline(stbir_info, output_w, (char *) output_data + output_row_start, encode_buffer, channels, alpha_channel, decode); stbir__encode_scanline(stbir_info, output_w, (char *) output_data + output_row_start, encode_buffer, channels, alpha_channel, decode);
} }
static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n, int in_first_scanline, int in_last_scanline, float in_center_of_out) static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n)
{ {
int x, k; int x, k;
int output_w = stbir_info->output_w; int output_w = stbir_info->output_w;
int output_h = stbir_info->output_h;
stbir__contributors* vertical_contributors = stbir_info->vertical_contributors; stbir__contributors* vertical_contributors = stbir_info->vertical_contributors;
float* vertical_coefficients = stbir_info->vertical_coefficients; float* vertical_coefficients = stbir_info->vertical_coefficients;
int channels = stbir_info->channels; int channels = stbir_info->channels;
int ring_buffer_entries = stbir_info->ring_buffer_num_entries; int ring_buffer_entries = stbir_info->ring_buffer_num_entries;
void* output_data = stbir_info->output_data;
float* horizontal_buffer = stbir_info->horizontal_buffer; float* horizontal_buffer = stbir_info->horizontal_buffer;
int coefficient_width = stbir_info->vertical_coefficient_width; int coefficient_width = stbir_info->vertical_coefficient_width;
int contributor = n + stbir_info->vertical_filter_pixel_margin; int contributor = n + stbir_info->vertical_filter_pixel_margin;
@ -1990,7 +1990,6 @@ static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n,
float* ring_buffer = stbir_info->ring_buffer; float* ring_buffer = stbir_info->ring_buffer;
int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index; int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index;
int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline; int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline;
int ring_buffer_last_scanline = stbir_info->ring_buffer_last_scanline;
int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float); int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float);
int n0,n1; int n0,n1;
@ -2103,7 +2102,7 @@ static void stbir__buffer_loop_upsample(stbir__info* stbir_info)
stbir__decode_and_resample_upsample(stbir_info, stbir_info->ring_buffer_last_scanline + 1); stbir__decode_and_resample_upsample(stbir_info, stbir_info->ring_buffer_last_scanline + 1);
// Now all buffers should be ready to write a row of vertical sampling. // Now all buffers should be ready to write a row of vertical sampling.
stbir__resample_vertical_upsample(stbir_info, y, in_first_scanline, in_last_scanline, in_center_of_out); stbir__resample_vertical_upsample(stbir_info, y);
STBIR_PROGRESS_REPORT((float)y / stbir_info->output_h); STBIR_PROGRESS_REPORT((float)y / stbir_info->output_h);
} }
@ -2189,7 +2188,7 @@ static void stbir__buffer_loop_downsample(stbir__info* stbir_info)
stbir__add_empty_ring_buffer_entry(stbir_info, stbir_info->ring_buffer_last_scanline + 1); stbir__add_empty_ring_buffer_entry(stbir_info, stbir_info->ring_buffer_last_scanline + 1);
// Now the horizontal buffer is ready to write to all ring buffer rows. // Now the horizontal buffer is ready to write to all ring buffer rows.
stbir__resample_vertical_downsample(stbir_info, y, out_first_scanline, out_last_scanline, out_center_of_in); stbir__resample_vertical_downsample(stbir_info, y);
} }
stbir__empty_ring_buffer(stbir_info, stbir_info->output_h); stbir__empty_ring_buffer(stbir_info, stbir_info->output_h);
@ -2393,8 +2392,8 @@ static int stbir__resize_allocated(stbir__info *info,
// This signals that the ring buffer is empty // This signals that the ring buffer is empty
info->ring_buffer_begin_index = -1; info->ring_buffer_begin_index = -1;
stbir__calculate_filters(info, info->horizontal_contributors, info->horizontal_coefficients, info->horizontal_filter, info->horizontal_scale, info->horizontal_shift, info->input_w, info->output_w); stbir__calculate_filters(info->horizontal_contributors, info->horizontal_coefficients, info->horizontal_filter, info->horizontal_scale, info->horizontal_shift, info->input_w, info->output_w);
stbir__calculate_filters(info, info->vertical_contributors, info->vertical_coefficients, info->vertical_filter, info->vertical_scale, info->vertical_shift, info->input_h, info->output_h); stbir__calculate_filters(info->vertical_contributors, info->vertical_coefficients, info->vertical_filter, info->vertical_scale, info->vertical_shift, info->input_h, info->output_h);
STBIR_PROGRESS_REPORT(0); STBIR_PROGRESS_REPORT(0);

12
tests/resample_test.cpp
View File

@ -70,9 +70,11 @@ void stbir_progress(float p)
#ifdef _WIN32 #ifdef _WIN32
#include <sys/timeb.h> #include <sys/timeb.h>
#endif
#include <direct.h> #include <direct.h>
#define mkdir(a, b) _mkdir(a)
#else
#include <sys/stat.h>
#endif
#define MT_SIZE 624 #define MT_SIZE 624
static size_t g_aiMT[MT_SIZE]; static size_t g_aiMT[MT_SIZE];
@ -833,7 +835,7 @@ void test_filters(void)
#define UMAX32 4294967295U #define UMAX32 4294967295U
static void write32(char *filename, stbir_uint32 *output, int w, int h) static void write32(const char *filename, stbir_uint32 *output, int w, int h)
{ {
stbir_uint8 *data = (stbir_uint8*) malloc(w*h*3); stbir_uint8 *data = (stbir_uint8*) malloc(w*h*3);
for (int i=0; i < w*h*3; ++i) for (int i=0; i < w*h*3; ++i)
@ -869,9 +871,9 @@ static void test_32(void)
void test_suite(int argc, char **argv) void test_suite(int argc, char **argv)
{ {
int i; int i;
char *barbara; const char *barbara;
_mkdir("test-output"); mkdir("test-output", 777);
if (argc > 1) if (argc > 1)
barbara = argv[1]; barbara = argv[1];

3
tests/resample_test_c.c
View File

@ -3,3 +3,6 @@
#include "stb_image_resize.h" #include "stb_image_resize.h"
// Just to make sure it will build properly with a c compiler // Just to make sure it will build properly with a c compiler
int main() {
}