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Merge branch 'master' of https://github.com/nothings/stb

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Ken Miller 2014-10-07 21:46:34 -05:00
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6
README.md
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@ -7,13 +7,15 @@ library | lastest version | category | description
--------------------- | ---- | -------- | --------------------------------
**stb_vorbis.c** | 1.04 | audio | decode ogg vorbis files from file/memory to float/16-bit signed output
**stb_image.h** | 1.46 | graphics | image loading/decoding from file/memory: JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC
**stb_truetype.h** | 0.9 | graphics | parse, decode, and rasterize characters from truetype fonts
**stb_truetype.h** | 0.99 | graphics | parse, decode, and rasterize characters from truetype fonts
**stb_image_write.h** | 0.95 | graphics | image writing to disk: PNG, TGA, BMP
**stb_image_resize.h** | 0.90 | graphics | resize images larger/smaller with good quality
**stretchy_buffer.h** | 1.01 | utility | typesafe dynamic array for C (i.e. approximation to vector<>), doesn't compile as C++
**stb_textedit.h** | 1.5 | UI | guts of a text editor for games etc implementing them from scratch
**stb_dxt.h** | 1.04 | 3D&nbsp;graphics | Fabian "ryg" Giesen's real-time DXT compressor
**stb_herringbone_wang_tile.h** | 0.6 | games | herringbone Wang tile map generator
**stb_perlin.h** | 0.2 | 3D&nbsp;graphics | revised Perlin noise (3D input, 1D output)
**stb_tilemap_editor.h** | 0.20 | games | embeddable tilemap editor
**stb_herringbone_wang_tile.h** | 0.6 | games | herringbone Wang tile map generator
**stb_c_lexer.h** | 0.06 | parsing | simplify writing parsers for C-like languages
**stb_divide.h** | 0.91 | math | more useful 32-bit modulus e.g. "euclidean divide"
**stb.h** | 2.23 | misc | helper functions for C, mostly redundant in C++; basically author's personal stuff

192
docs/stb_resample_ideas.txt
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@ -1,192 +0,0 @@
1.
Consider just porting this C++ public domain
library back to C:
https://code.google.com/p/imageresampler/source/browse/#svn%2Ftrunk
(recommended by @castano)
2.
Consider three cases just to suggest the spectrum
of possiblities:
a) linear upsample: each output pixel is a weighted sum
of 4 input pixels
b) cubic upsample: each output pixel is a weighted sum
of 16 input pixels
c) downsample by N with box filter: each output pixel
is a weighted sum of NxN input pixels, N can be very large
Now, suppose you want to handle 8-bit input, 16-bit
input, and float input, and you want to do sRGB correction
or not.
Suppose you create a temporary buffer of float pixels, say
one scanline tall. Actually two temp buffers, one for the
input and one for the output. You decode a scanline of the
input into the temp buffer which is always linear floats. This
isolates the handling of 8/16/float and sRGB to one place
(and still allows you to make optimized 8-bit-sRGB-to-float
lookup tables). This also allows you to put wrap logic here,
explicitly wrapping, reflecting, or replicating-from-edge
pixels that would come from off-edge.
You then do whatever the appropriate weighted sums are
into the output buffer, and you move on to the next
scanline of the input.
The algorithm just described works directly for case (c).
Suppose you're downsampling by 2.5; then output scanline 0
sums from input scanlines 0, 1, and 2; output scanline 1
sums from 2,3,4; output 2 from 5,6,7; output 3 from 7,8,9.
Note how 2 & 7 get reused, but we don't have to recompute
them because we can do things in a single linear pass
through the input and output at the same time.
Now, consider case (a). When upsampling, the same two input
scanlines will get sampled-from for multiple output scanlines.
So, to avoid recomputing the input scanlines, we need either
multiple input or multiple output temp buffer lines. Since
the number of output lines a given pair of input scanlines
might touch scales with the upsample amount, it makes more
sense to use two input scanline buffers. For cubic, you'll
need four scanline buffers, and in general the number of
buffers will be limited by the max filter width, which is
presumably hardcoded.
It turns out to be slightly different for two reasons:
1. when using an arbitrary filter and downsampling,
you actually need N output buffers and 1 input buffer
(vs 1 output buffer and N input buffers upsampling)
2. this approach will be very inefficient as written.
you want to use separable filters and actually do
seperable computation: first decode an input scanline
into a 'decode' buffer, then horizontally resample it
into the "input" buffer (kind of a misnomer, but
they're the inputs to the vertical resampler)
(The above approach isn't optimal for non-uniform resampling;
optimal is to do whichever axis is smaller first, but I don't
think we have to care about doing that right.)
Now, you can either:
1. malloc the temp memory
2. alloca it
3. allocate a fixed amount on the stack
4. let the user pass it in
I forbid #2 in stb libraries for portability.
If you're not allocating the output image, but rather requiring
the user to pass it in, it's probably worth trying to avoid #1
because people always want to use stb libs without any memory
allocations for various reason. (Note that most stb libs go
crazy with memory allocations--you shouldn't use stb_image
in a console game--but I've tried to avoid it more in newer
libs.)
The way #3 would work is instead of using a scanline-width
temp buffer, use some fixed-width temp buffer that's W pixels,
and scale the image in vertical stripes that are that wide.
Suppose you make the temp buffers 256 wide; then an upsample
by 8 computes 256-pixel-width strips (from ~32-pixel-wide input
strips), but a downsample by 8 computes ~32-pixel-width
strips (from a 256-pixel width strip). Note this limits
the max down/upsampling to be ballpark 256x along the
horizontal axis.
In the following, I do #3 and allow #4 for cases where #3 is
too small, but it's not the only possibility:
Function prototypes:
the highest-level one could be:
stb_resample_8bit(uint8_t *dest, int dest_width, int dest_height,
uint8_t const *src , int src_width, int src_height,
int channels,
stbr_filter filter);
the lowest-level one could be:
stb_resample_arbitrary(void *dst, stbr_type dst_type, int dst_width, int dst_height, int dst_stride_in_bytes,
void const *src, stbr_type src_type, int src_width, int src_height, int src_stride_in_bytes,
float s0, float t0, float s1, float t1, // range of source to use, 0..1 in GPU texture-coordinate style
int channels,
int nonpremul_alpha_channel_index,
stbr_wrapmode wrap, // clamp, wrap, mirror
stbr_filter filter,
void *tempmem, size_t tempmem_size_in_bytes);
And there would be a bunch of convenience functions in-between those two levels.
Some notes:
s0,t0,s1,t1:
this allows fine subpixel-positioning and subpixel-resizing in an explicit way without
things having to be exact pixel multiples. it allows people to pseudo-stream
images by computing "tiles" of images a bit at a time without forcing those
tiles to quantize their source data.
nonpremul_alpha_channel_index:
if this is negative, no channels are processed specially
if this is non-negative, then it's the index of the alpha channel,
and the image should be treated as non-premultiplied alpha that
needs to be resampled accounting for this (weight the sampling
by the alpha channel, i.e. premultiply, filter, unpremultiply).
this mechanism only allows one alpha channel and ALL channels
are scaled by it; an alternative would be to find some way to
pass in which channels serve as alpha channels for which other
channels, but eh.
tempmem, tempmem_size:
all functions will needed tempmem, but they can allocate a fixed tempmem buffer
on the stack. providing an API that allows overriding the amount of tempmem
available allows people to process arbitrarily large images. the return
value for the function could be 0 on success or non-0 being the size of
tempmem needed.
src_stride, dest_stride:
the stride variables are signed to allow you to describe both traditional
top-to-bottom images (pass in a pointer to the top-left pixel and
a positive stride) and bottom-to-top images (pass in a pointer to
the bottom-left pixel and a negative stride)
ordering of src & dest:
put these in whatever order you like, i just chose one arbitrarily
width & height
these are ints not unsigned ints or size_ts because i personally forbid
unsigned variables for almost everything to avoid signed/unsigned comparison
issues, but this is a matter of personal taste and you can do differently
Intermediate-level functions should be provided for each source type & same dest type
so that the code is typesafe; only when people fall back to stb_resample_arbitrary should
they be at risk for type unsafety. (One way to deal avoid an explosion of functions of
every possible *combination* of types in a type-safe way would be to define one function
for each input type, and accept three separate output pointers, one for each type, only
one of which can be non-NULL. 9 functions isn't that bad, but if you want to have three
or four intermediate-level functions with fewer parameters, 9*4 gets silly. Could also
use the same trick for stb_resample_arbitrary, replacing it with three typesafe functions.)
Reference:
Cubic sampling function for seperable cubic:
f(x) = (a+2)*x^3 - (a+3)*x^2 + 1 for 0 <= x <= 1
f(x) = a*x^3 - 5*a*x^2 + 8*a*x - 4*a for 1 < x <= 2
f(x) = 0 otherwise
"a" is configurable, try -1/2 (from http://pixinsight.com/forum/index.php?topic=556.0 )

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33
stb_truetype.h
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@ -1,5 +1,5 @@
// stb_truetype.h - v0.9 - public domain
// authored from 2009-2013 by Sean Barrett / RAD Game Tools
// stb_truetype.h - v0.99 - public domain
// authored from 2009-2014 by Sean Barrett / RAD Game Tools
//
// This library processes TrueType files:
// parse files
@ -21,7 +21,7 @@
// Mikko Mononen: compound shape support, more cmap formats
// Tor Andersson: kerning, subpixel rendering
//
// Bug/warning reports:
// Bug/warning reports/fixes:
// "Zer" on mollyrocket (with fix)
// Cass Everitt
// stoiko (Haemimont Games)
@ -33,9 +33,11 @@
// Anthony Pesch
// Johan Duparc
// Hou Qiming
// Fabian "ryg" Giesen
//
// VERSION HISTORY
//
// 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
// 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID
// 0.8b (2014-07-07) fix a warning
// 0.8 (2014-05-25) fix a few more warnings
@ -1385,14 +1387,21 @@ void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
int x0,y0,x1,y1;
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1))
x0=y0=x1=y1=0; // e.g. space character
// now move to integral bboxes (treating pixels as little squares, what pixels get touched)?
if (ix0) *ix0 = STBTT_ifloor(x0 * scale_x + shift_x);
if (iy0) *iy0 = -STBTT_iceil (y1 * scale_y + shift_y);
if (ix1) *ix1 = STBTT_iceil (x1 * scale_x + shift_x);
if (iy1) *iy1 = -STBTT_ifloor(y0 * scale_y + shift_y);
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
// e.g. space character
if (ix0) *ix0 = 0;
if (iy0) *iy0 = 0;
if (ix1) *ix1 = 0;
if (iy1) *iy1 = 0;
} else {
// move to integral bboxes (treating pixels as little squares, what pixels get touched)?
if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
}
}
void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
@ -1639,9 +1648,9 @@ static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcou
a=j,b=k;
}
e[n].x0 = p[a].x * scale_x + shift_x;
e[n].y0 = p[a].y * y_scale_inv * vsubsample + shift_y;
e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
e[n].x1 = p[b].x * scale_x + shift_x;
e[n].y1 = p[b].y * y_scale_inv * vsubsample + shift_y;
e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
++n;
}
}

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tests/resample_test.cpp Normal file
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@ -0,0 +1,983 @@
#include <malloc.h>
#if defined(_WIN32) && _MSC_VER > 1200
#define STBIR_ASSERT(x) \
if (!(x)) { \
__debugbreak(); \
} else
#else
#include <assert.h>
#define STBIR_ASSERT(x) assert(x)
#endif
#define STBIR_MALLOC stbir_malloc
#define STBIR_FREE stbir_free
class stbir_context {
public:
stbir_context()
{
size = 1000000;
memory = malloc(size);
}
~stbir_context()
{
free(memory);
}
size_t size;
void* memory;
} g_context;
void* stbir_malloc(size_t size, void* context)
{
if (!context)
return malloc(size);
stbir_context* real_context = (stbir_context*)context;
if (size > real_context->size)
return 0;
return real_context->memory;
}
void stbir_free(void* memory, void* context)
{
if (!context)
free(memory);
}
//#include <stdio.h>
void stbir_progress(float p)
{
//printf("%f\n", p);
STBIR_ASSERT(p >= 0 && p <= 1);
}
#define STBIR_PROGRESS_REPORT stbir_progress
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#define STB_IMAGE_RESIZE_STATIC
#include "stb_image_resize.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#ifdef _WIN32
#include <sys/timeb.h>
#endif
#include <direct.h>
#define MT_SIZE 624
static size_t g_aiMT[MT_SIZE];
static size_t g_iMTI = 0;
// Mersenne Twister implementation from Wikipedia.
// Avoiding use of the system rand() to be sure that our tests generate the same test data on any system.
void mtsrand(size_t iSeed)
{
g_aiMT[0] = iSeed;
for (size_t i = 1; i < MT_SIZE; i++)
{
size_t inner1 = g_aiMT[i - 1];
size_t inner2 = (g_aiMT[i - 1] >> 30);
size_t inner = inner1 ^ inner2;
g_aiMT[i] = (0x6c078965 * inner) + i;
}
g_iMTI = 0;
}
size_t mtrand()
{
if (g_iMTI == 0)
{
for (size_t i = 0; i < MT_SIZE; i++)
{
size_t y = (0x80000000 & (g_aiMT[i])) + (0x7fffffff & (g_aiMT[(i + 1) % MT_SIZE]));
g_aiMT[i] = g_aiMT[(i + 397) % MT_SIZE] ^ (y >> 1);
if ((y % 2) == 1)
g_aiMT[i] = g_aiMT[i] ^ 0x9908b0df;
}
}
size_t y = g_aiMT[g_iMTI];
y = y ^ (y >> 11);
y = y ^ ((y << 7) & (0x9d2c5680));
y = y ^ ((y << 15) & (0xefc60000));
y = y ^ (y >> 18);
g_iMTI = (g_iMTI + 1) % MT_SIZE;
return y;
}
inline float mtfrand()
{
const int ninenine = 999999;
return (float)(mtrand() % ninenine)/ninenine;
}
static void resizer(int argc, char **argv)
{
unsigned char* input_pixels;
unsigned char* output_pixels;
int w, h;
int n;
int out_w, out_h;
input_pixels = stbi_load(argv[1], &w, &h, &n, 0);
out_w = w*3;
out_h = h*3;
output_pixels = (unsigned char*) malloc(out_w*out_h*n);
//stbir_resize_uint8_srgb(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n, -1,0);
stbir_resize_uint8(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n);
stbi_write_png("output.png", out_w, out_h, n, output_pixels, 0);
exit(0);
}
static void performance(int argc, char **argv)
{
unsigned char* input_pixels;
unsigned char* output_pixels;
int w, h, count;
int n, i;
int out_w, out_h, srgb=1;
input_pixels = stbi_load(argv[1], &w, &h, &n, 0);
#if 0
out_w = w/4; out_h = h/4; count=100; // 1
#elif 0
out_w = w*2; out_h = h/4; count=20; // 2 // note this is structured pessimily, would be much faster to downsample vertically first
#elif 0
out_w = w/4; out_h = h*2; count=50; // 3
#elif 0
out_w = w*3; out_h = h*3; count=2; srgb=0; // 4
#else
out_w = w*3; out_h = h*3; count=2; // 5 // this is dominated by linear->sRGB conversion
#endif
output_pixels = (unsigned char*) malloc(out_w*out_h*n);
for (i=0; i < count; ++i)
if (srgb)
stbir_resize_uint8_srgb(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n,-1,0);
else
stbir_resize(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, STBIR_TYPE_UINT8, n,-1, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT, STBIR_COLORSPACE_LINEAR, NULL);
exit(0);
}
void test_suite(int argc, char **argv);
int main(int argc, char** argv)
{
//resizer(argc, argv);
//performance(argc, argv);
test_suite(argc, argv);
return 0;
}
void resize_image(const char* filename, float width_percent, float height_percent, stbir_filter filter, stbir_edge edge, stbir_colorspace colorspace, const char* output_filename)
{
int w, h, n;
unsigned char* input_data = stbi_load(filename, &w, &h, &n, 0);
if (!input_data)
{
printf("Input image could not be loaded\n");
return;
}
int out_w = (int)(w * width_percent);
int out_h = (int)(h * height_percent);
unsigned char* output_data = (unsigned char*)malloc(out_w * out_h * n);
stbir_resize(input_data, w, h, 0, output_data, out_w, out_h, 0, STBIR_TYPE_UINT8, n, STBIR_ALPHA_CHANNEL_NONE, 0, edge, edge, filter, filter, colorspace, &g_context);
stbi_image_free(input_data);
stbi_write_png(output_filename, out_w, out_h, n, output_data, 0);
free(output_data);
}
template <typename F, typename T>
void convert_image(const F* input, T* output, int length)
{
double f = (pow(2.0, 8.0 * sizeof(T)) - 1) / (pow(2.0, 8.0 * sizeof(F)) - 1);
for (int i = 0; i < length; i++)
output[i] = (T)(((double)input[i]) * f);
}
template <typename T>
void test_format(const char* file, float width_percent, float height_percent, stbir_datatype type, stbir_colorspace colorspace)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
T* T_data = (T*)malloc(w * h * n * sizeof(T));
memset(T_data, 0, w*h*n*sizeof(T));
convert_image<unsigned char, T>(input_data, T_data, w * h * n);
T* output_data = (T*)malloc(new_w * new_h * n * sizeof(T));
stbir_resize(T_data, w, h, 0, output_data, new_w, new_h, 0, type, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, colorspace, &g_context);
free(T_data);
stbi_image_free(input_data);
unsigned char* char_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(char));
convert_image<T, unsigned char>(output_data, char_data, new_w * new_h * n);
char output[200];
sprintf(output, "test-output/type-%d-%d-%d-%d-%s", type, colorspace, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, n, char_data, 0);
free(char_data);
free(output_data);
}
void convert_image_float(const unsigned char* input, float* output, int length)
{
for (int i = 0; i < length; i++)
output[i] = ((float)input[i])/255;
}
void convert_image_float(const float* input, unsigned char* output, int length)
{
for (int i = 0; i < length; i++)
output[i] = (unsigned char)(stbir__saturate(input[i]) * 255);
}
void test_float(const char* file, float width_percent, float height_percent, stbir_datatype type, stbir_colorspace colorspace)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
float* T_data = (float*)malloc(w * h * n * sizeof(float));
convert_image_float(input_data, T_data, w * h * n);
float* output_data = (float*)malloc(new_w * new_h * n * sizeof(float));
stbir_resize_float_generic(T_data, w, h, 0, output_data, new_w, new_h, 0, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, colorspace, &g_context);
free(T_data);
stbi_image_free(input_data);
unsigned char* char_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(char));
convert_image_float(output_data, char_data, new_w * new_h * n);
char output[200];
sprintf(output, "test-output/type-%d-%d-%d-%d-%s", type, colorspace, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, n, char_data, 0);
free(char_data);
free(output_data);
}
void test_channels(const char* file, float width_percent, float height_percent, int channels)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
unsigned char* channels_data = (unsigned char*)malloc(w * h * channels * sizeof(unsigned char));
for (int i = 0; i < w * h; i++)
{
int input_position = i * n;
int output_position = i * channels;
for (int c = 0; c < channels; c++)
channels_data[output_position + c] = input_data[input_position + stbir__min(c, n)];
}
unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * channels * sizeof(unsigned char));
stbir_resize_uint8_srgb(channels_data, w, h, 0, output_data, new_w, new_h, 0, channels, STBIR_ALPHA_CHANNEL_NONE, 0);
free(channels_data);
stbi_image_free(input_data);
char output[200];
sprintf(output, "test-output/channels-%d-%d-%d-%s", channels, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, channels, output_data, 0);
free(output_data);
}
void test_subpixel(const char* file, float width_percent, float height_percent, float s1, float t1)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
s1 = ((float)w - 1 + s1)/w;
t1 = ((float)h - 1 + t1)/h;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(unsigned char));
stbir_resize_region(input_data, w, h, 0, output_data, new_w, new_h, 0, STBIR_TYPE_UINT8, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, s1, t1);
stbi_image_free(input_data);
char output[200];
sprintf(output, "test-output/subpixel-%d-%d-%f-%f-%s", new_w, new_h, s1, t1, file);
stbi_write_png(output, new_w, new_h, n, output_data, 0);
free(output_data);
}
unsigned int* pixel(unsigned int* buffer, int x, int y, int c, int w, int n)
{
return &buffer[y*w*n + x*n + c];
}
void test_premul()
{
unsigned int input[2 * 2 * 4];
unsigned int output[1 * 1 * 4];
unsigned int output2[2 * 2 * 4];
memset(input, 0, sizeof(input));
// First a test to make sure premul is working properly.
// Top left - solid red
*pixel(input, 0, 0, 0, 2, 4) = 255;
*pixel(input, 0, 0, 3, 2, 4) = 255;
// Bottom left - solid red
*pixel(input, 0, 1, 0, 2, 4) = 255;
*pixel(input, 0, 1, 3, 2, 4) = 255;
// Top right - transparent green
*pixel(input, 1, 0, 1, 2, 4) = 255;
*pixel(input, 1, 0, 3, 2, 4) = 25;
// Bottom right - transparent green
*pixel(input, 1, 1, 1, 2, 4) = 255;
*pixel(input, 1, 1, 3, 2, 4) = 25;
stbir_resize(input, 2, 2, 0, output, 1, 1, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context);
float r = (float)255 / 4294967296;
float g = (float)255 / 4294967296;
float ra = (float)255 / 4294967296;
float ga = (float)25 / 4294967296;
float a = (ra + ga) / 2;
STBIR_ASSERT(output[0] == (unsigned int)(r * ra / 2 / a * 4294967296 + 0.5f)); // 232
STBIR_ASSERT(output[1] == (unsigned int)(g * ga / 2 / a * 4294967296 + 0.5f)); // 23
STBIR_ASSERT(output[2] == 0);
STBIR_ASSERT(output[3] == (unsigned int)(a * 4294967296 + 0.5f)); // 140
// Now a test to make sure it doesn't clobber existing values.
// Top right - completely transparent green
*pixel(input, 1, 0, 1, 2, 4) = 255;
*pixel(input, 1, 0, 3, 2, 4) = 0;
// Bottom right - completely transparent green
*pixel(input, 1, 1, 1, 2, 4) = 255;
*pixel(input, 1, 1, 3, 2, 4) = 0;
stbir_resize(input, 2, 2, 0, output2, 2, 2, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context);
STBIR_ASSERT(*pixel(output2, 0, 0, 0, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 0, 1, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 0, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 0, 3, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 1, 0, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 1, 1, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 1, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 1, 3, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 0, 0, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 0, 1, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 0, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 0, 3, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 0, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 1, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 1, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 3, 2, 4) == 0);
}
// test that splitting a pow-2 image into tiles produces identical results
void test_subpixel_1()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output_data[16 * 16];
stbir_resize_region(image, 8, 8, 0, output_data, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, 1, 1);
unsigned char output_left[8 * 16];
unsigned char output_right[8 * 16];
stbir_resize_region(image, 8, 8, 0, output_left, 8, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, 0.5f, 1);
stbir_resize_region(image, 8, 8, 0, output_right, 8, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0.5f, 0, 1, 1);
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 16; y++)
{
STBIR_ASSERT(output_data[y * 16 + x] == output_left[y * 8 + x]);
STBIR_ASSERT(output_data[y * 16 + x + 8] == output_right[y * 8 + x]);
}
}
}
// test that replicating an image and using a subtile of it produces same results as wraparound
void test_subpixel_2()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char large_image[32 * 32];
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
large_image[j*4*8*8 + i*8 + y*4*8 + x] = image[y*8 + x];
}
}
}
unsigned char output_data_1[16 * 16];
unsigned char output_data_2[16 * 16];
stbir_resize(image, 8, 8, 0, output_data_1, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_WRAP, STBIR_EDGE_WRAP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize_region(large_image, 32, 32, 0, output_data_2, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_WRAP, STBIR_EDGE_WRAP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0.25f, 0.25f, 0.5f, 0.5f);
{for (int x = 0; x < 16; x++)
{
for (int y = 0; y < 16; y++)
STBIR_ASSERT(output_data_1[y * 16 + x] == output_data_2[y * 16 + x]);
}}
}
// test that 0,0,1,1 subpixel produces same result as no-rect
void test_subpixel_3()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output_data_1[32 * 32];
unsigned char output_data_2[32 * 32];
stbir_resize_region(image, 8, 8, 0, output_data_1, 32, 32, 0, STBIR_TYPE_UINT8, 1, 0, STBIR_ALPHA_CHANNEL_NONE, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_LINEAR, NULL, 0, 0, 1, 1);
stbir_resize_uint8(image, 8, 8, 0, output_data_2, 32, 32, 0, 1);
for (int x = 0; x < 32; x++)
{
for (int y = 0; y < 32; y++)
STBIR_ASSERT(output_data_1[y * 32 + x] == output_data_2[y * 32 + x]);
}
}
// test that 1:1 resample using s,t=0,0,1,1 with bilinear produces original image
void test_subpixel_4()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output[8 * 8];
stbir_resize_region(image, 8, 8, 0, output, 8, 8, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_TRIANGLE, STBIR_FILTER_TRIANGLE, STBIR_COLORSPACE_LINEAR, &g_context, 0, 0, 1, 1);
STBIR_ASSERT(memcmp(image, output, 8 * 8) == 0);
}
static unsigned int image88_int[8][8];
static unsigned char image88 [8][8];
static unsigned char output88[8][8];
static unsigned char output44[4][4];
static unsigned char output22[2][2];
static unsigned char output11[1][1];
void resample_88(stbir_filter filter)
{
stbir_resize_uint8_generic(image88[0],8,8,0, output88[0],8,8,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output44[0],4,4,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output22[0],2,2,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output11[0],1,1,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
}
void verify_box(void)
{
int i,j,t;
resample_88(STBIR_FILTER_BOX);
for (i=0; i < sizeof(image88); ++i)
STBIR_ASSERT(image88[0][i] == output88[0][i]);
t = 0;
for (j=0; j < 4; ++j)
for (i=0; i < 4; ++i) {
int n = image88[j*2+0][i*2+0]
+ image88[j*2+0][i*2+1]
+ image88[j*2+1][i*2+0]
+ image88[j*2+1][i*2+1];
STBIR_ASSERT(output44[j][i] == ((n+2)>>2) || output44[j][i] == ((n+1)>>2)); // can't guarantee exact rounding due to numerical precision
t += n;
}
STBIR_ASSERT(output11[0][0] == ((t+32)>>6) || output11[0][0] == ((t+31)>>6)); // can't guarantee exact rounding due to numerical precision
}
void verify_filter_normalized(stbir_filter filter, int output_size, unsigned int value)
{
int i, j;
unsigned int output[64];
stbir_resize(image88_int[0], 8, 8, 0, output, output_size, output_size, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, filter, filter, STBIR_COLORSPACE_LINEAR, NULL);
for (j = 0; j < output_size; ++j)
for (i = 0; i < output_size; ++i)
STBIR_ASSERT(value == output[j*output_size + i]);
}
float round2(float f)
{
return (float) floor(f+0.5f); // round() isn't C standard pre-C99
}
void test_filters(void)
{
int i,j;
mtsrand(0);
for (i=0; i < sizeof(image88); ++i)
image88[0][i] = mtrand() & 255;
verify_box();
for (i=0; i < sizeof(image88); ++i)
image88[0][i] = 0;
image88[4][4] = 255;
verify_box();
for (j=0; j < 8; ++j)
for (i=0; i < 8; ++i)
image88[j][i] = (j^i)&1 ? 255 : 0;
verify_box();
for (j=0; j < 8; ++j)
for (i=0; i < 8; ++i)
image88[j][i] = i&2 ? 255 : 0;
verify_box();
int value = 64;
for (j = 0; j < 8; ++j)
for (i = 0; i < 8; ++i)
image88_int[j][i] = value;
verify_filter_normalized(STBIR_FILTER_BOX, 8, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 8, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 8, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 8, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 8, value);
verify_filter_normalized(STBIR_FILTER_BOX, 4, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 4, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 4, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 4, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 4, value);
verify_filter_normalized(STBIR_FILTER_BOX, 2, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 2, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 2, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 2, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 2, value);
verify_filter_normalized(STBIR_FILTER_BOX, 1, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 1, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 1, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 1, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 1, value);
{
// This test is designed to produce coefficients that are very badly denormalized.
unsigned int v = 556;
unsigned int input[100 * 100];
unsigned int output[11 * 11];
for (j = 0; j < 100 * 100; ++j)
input[j] = v;
stbir_resize(input, 100, 100, 0, output, 11, 11, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_TRIANGLE, STBIR_FILTER_TRIANGLE, STBIR_COLORSPACE_LINEAR, NULL);
for (j = 0; j < 11 * 11; ++j)
STBIR_ASSERT(v == output[j]);
}
{
// Now test the trapezoid filter for downsampling.
unsigned int input[3 * 1];
unsigned int output[2 * 1];
input[0] = 0;
input[1] = 255;
input[2] = 127;
stbir_resize(input, 3, 1, 0, output, 2, 1, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == (unsigned int)round2((float)(input[0] * 2 + input[1]) / 3));
STBIR_ASSERT(output[1] == (unsigned int)round2((float)(input[2] * 2 + input[1]) / 3));
stbir_resize(input, 1, 3, 0, output, 1, 2, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == (unsigned int)round2((float)(input[0] * 2 + input[1]) / 3));
STBIR_ASSERT(output[1] == (unsigned int)round2((float)(input[2] * 2 + input[1]) / 3));
}
{
// Now test the trapezoid filter for upsampling.
unsigned int input[2 * 1];
unsigned int output[3 * 1];
input[0] = 0;
input[1] = 255;
stbir_resize(input, 2, 1, 0, output, 3, 1, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == input[0]);
STBIR_ASSERT(output[1] == (input[0] + input[1]) / 2);
STBIR_ASSERT(output[2] == input[1]);
stbir_resize(input, 1, 2, 0, output, 1, 3, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == input[0]);
STBIR_ASSERT(output[1] == (input[0] + input[1]) / 2);
STBIR_ASSERT(output[2] == input[1]);
}
// checkerboard
{
unsigned char input[64][64];
unsigned char output[16][16];
int i,j;
for (j=0; j < 64; ++j)
for (i=0; i < 64; ++i)
input[j][i] = (i^j)&1 ? 255 : 0;
stbir_resize_uint8_generic(input[0], 64, 64, 0, output[0],16,16,0, 1,-1,0,STBIR_EDGE_WRAP,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,0);
for (j=0; j < 16; ++j)
for (i=0; i < 16; ++i)
STBIR_ASSERT(output[j][i] == 128);
stbir_resize_uint8_srgb_edgemode(input[0], 64, 64, 0, output[0],16,16,0, 1,-1,0,STBIR_EDGE_WRAP);
for (j=0; j < 16; ++j)
for (i=0; i < 16; ++i)
STBIR_ASSERT(output[j][i] == 188);
}
{
// Test trapezoid box filter
unsigned char input[2 * 1];
unsigned char output[127 * 1];
input[0] = 0;
input[1] = 255;
stbir_resize(input, 2, 1, 0, output, 127, 1, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == 0);
STBIR_ASSERT(output[127 / 2 - 1] == 0);
STBIR_ASSERT(output[127 / 2] == 128);
STBIR_ASSERT(output[127 / 2 + 1] == 255);
STBIR_ASSERT(output[126] == 255);
stbi_write_png("test-output/trapezoid-upsample-horizontal.png", 127, 1, 1, output, 0);
stbir_resize(input, 1, 2, 0, output, 1, 127, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == 0);
STBIR_ASSERT(output[127 / 2 - 1] == 0);
STBIR_ASSERT(output[127 / 2] == 128);
STBIR_ASSERT(output[127 / 2 + 1] == 255);
STBIR_ASSERT(output[126] == 255);
stbi_write_png("test-output/trapezoid-upsample-vertical.png", 1, 127, 1, output, 0);
}
}
#define UMAX32 4294967295U
static void write32(char *filename, stbir_uint32 *output, int w, int h)
{
stbir_uint8 *data = (stbir_uint8*) malloc(w*h*3);
for (int i=0; i < w*h*3; ++i)
data[i] = output[i]>>24;
stbi_write_png(filename, w, h, 3, data, 0);
free(data);
}
static void test_32(void)
{
int w=100,h=120,x,y, out_w,out_h;
stbir_uint32 *input = (stbir_uint32*) malloc(4 * 3 * w * h);
stbir_uint32 *output = (stbir_uint32*) malloc(4 * 3 * 3*w * 3*h);
for (y=0; y < h; ++y) {
for (x=0; x < w; ++x) {
input[y*3*w + x*3 + 0] = x * ( UMAX32/w );
input[y*3*w + x*3 + 1] = y * ( UMAX32/h );
input[y*3*w + x*3 + 2] = UMAX32/2;
}
}
out_w = w*33/16;
out_h = h*33/16;
stbir_resize(input,w,h,0,output,out_w,out_h,0,STBIR_TYPE_UINT32,3,-1,0,STBIR_EDGE_CLAMP,STBIR_EDGE_CLAMP,STBIR_FILTER_DEFAULT,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,NULL);
write32("test-output/seantest_1.png", output,out_w,out_h);
out_w = w*16/33;
out_h = h*16/33;
stbir_resize(input,w,h,0,output,out_w,out_h,0,STBIR_TYPE_UINT32,3,-1,0,STBIR_EDGE_CLAMP,STBIR_EDGE_CLAMP,STBIR_FILTER_DEFAULT,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,NULL);
write32("test-output/seantest_2.png", output,out_w,out_h);
}
void test_suite(int argc, char **argv)
{
int i;
char *barbara;
_mkdir("test-output");
if (argc > 1)
barbara = argv[1];
else
barbara = "barbara.png";
// check what cases we need normalization for
#if 1
{
float x, y;
for (x = -1; x < 1; x += 0.05f) {
float sums[5] = { 0 };
float o;
for (o = -5; o <= 5; ++o) {
sums[0] += stbir__filter_mitchell(x + o, 1);
sums[1] += stbir__filter_catmullrom(x + o, 1);
sums[2] += stbir__filter_cubic(x + o, 1);
sums[3] += stbir__filter_triangle(x + o, 1);
sums[4] += stbir__filter_trapezoid(x + o, 0.5f);
}
for (i = 0; i < 5; ++i)
STBIR_ASSERT(sums[i] >= 1.0 - 0.001 && sums[i] <= 1.0 + 0.001);
}
#if 1
for (y = 0.11f; y < 1; y += 0.01f) { // Step
for (x = -1; x < 1; x += 0.05f) { // Phase
float sums[5] = { 0 };
float o;
for (o = -5; o <= 5; o += y) {
sums[0] += y * stbir__filter_mitchell(x + o, 1);
sums[1] += y * stbir__filter_catmullrom(x + o, 1);
sums[2] += y * stbir__filter_cubic(x + o, 1);
sums[4] += y * stbir__filter_trapezoid(x + o, 0.5f);
sums[3] += y * stbir__filter_triangle(x + o, 1);
}
for (i = 0; i < 3; ++i)
STBIR_ASSERT(sums[i] >= 1.0 - 0.0170 && sums[i] <= 1.0 + 0.0170);
}
}
#endif
}
#endif
#if 0 // linear_to_srgb_uchar table
for (i=0; i < 256; ++i) {
float f = stbir__srgb_to_linear((i-0.5f)/255.0f);
printf("%9d, ", (int) ((f) * (1<<28)));
if ((i & 7) == 7)
printf("\n");
}
#endif
// old tests that hacky fix worked on - test that
// every uint8 maps to itself
for (i = 0; i < 256; i++) {
float f = stbir__srgb_to_linear(float(i) / 255);
int n = stbir__linear_to_srgb_uchar(f);
STBIR_ASSERT(n == i);
}
// new tests that hacky fix failed for - test that
// values adjacent to uint8 round to nearest uint8
for (i = 0; i < 256; i++) {
for (float y = -0.42f; y <= 0.42f; y += 0.01f) {
float f = stbir__srgb_to_linear((i+y) / 255.0f);
int n = stbir__linear_to_srgb_uchar(f);
STBIR_ASSERT(n == i);
}
}
test_filters();
test_subpixel_1();
test_subpixel_2();
test_subpixel_3();
test_subpixel_4();
test_premul();
test_32();
// Some tests to make sure errors don't pop up with strange filter/dimension combinations.
stbir_resize(image88, 8, 8, 0, output88, 4, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 4, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_BOX, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 16, 4, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 16, 4, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_BOX, STBIR_COLORSPACE_SRGB, &g_context);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 0.5f, 0.5f, (float)i / 10, 1);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 0.5f, 0.5f, 1, (float)i / 10);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 2, 2, (float)i / 10, 1);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 2, 2, 1, (float)i / 10);
// Channels test
test_channels(barbara, 0.5f, 0.5f, 1);
test_channels(barbara, 0.5f, 0.5f, 2);
test_channels(barbara, 0.5f, 0.5f, 3);
test_channels(barbara, 0.5f, 0.5f, 4);
test_channels(barbara, 2, 2, 1);
test_channels(barbara, 2, 2, 2);
test_channels(barbara, 2, 2, 3);
test_channels(barbara, 2, 2, 4);
// filter tests
resize_image(barbara, 2, 2, STBIR_FILTER_BOX , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-nearest.png");
resize_image(barbara, 2, 2, STBIR_FILTER_TRIANGLE , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-bilinear.png");
resize_image(barbara, 2, 2, STBIR_FILTER_CUBICBSPLINE, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-bicubic.png");
resize_image(barbara, 2, 2, STBIR_FILTER_CATMULLROM , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-catmullrom.png");
resize_image(barbara, 2, 2, STBIR_FILTER_MITCHELL , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-mitchell.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_BOX , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-nearest.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_TRIANGLE , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-bilinear.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_CUBICBSPLINE, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-bicubic.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_CATMULLROM , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-catmullrom.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_MITCHELL , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-mitchell.png");
for (i = 10; i < 100; i++)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-%d.jpg", i);
resize_image(barbara, (float)i / 100, 1, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 110; i < 500; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-%d.jpg", i);
resize_image(barbara, (float)i / 100, 1, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 10; i < 100; i++)
{
char outname[200];
sprintf(outname, "test-output/barbara-height-%d.jpg", i);
resize_image(barbara, 1, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 110; i < 500; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-height-%d.jpg", i);
resize_image(barbara, 1, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 50; i < 200; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-height-%d.jpg", i);
resize_image(barbara, 100 / (float)i, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
test_format<unsigned short>(barbara, 0.5, 2.0, STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB);
test_format<unsigned short>(barbara, 0.5, 2.0, STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR);
test_format<unsigned short>(barbara, 2.0, 0.5, STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB);
test_format<unsigned short>(barbara, 2.0, 0.5, STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR);
test_format<unsigned int>(barbara, 0.5, 2.0, STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB);
test_format<unsigned int>(barbara, 0.5, 2.0, STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR);
test_format<unsigned int>(barbara, 2.0, 0.5, STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB);
test_format<unsigned int>(barbara, 2.0, 0.5, STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR);
test_float(barbara, 0.5, 2.0, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB);
test_float(barbara, 0.5, 2.0, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR);
test_float(barbara, 2.0, 0.5, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB);
test_float(barbara, 2.0, 0.5, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR);
// Edge behavior tests
resize_image("hgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/hgradient-clamp.png");
resize_image("hgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_WRAP, STBIR_COLORSPACE_LINEAR, "test-output/hgradient-wrap.png");
resize_image("vgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/vgradient-clamp.png");
resize_image("vgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_WRAP, STBIR_COLORSPACE_LINEAR, "test-output/vgradient-wrap.png");
resize_image("1px-border.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_LINEAR, "test-output/1px-border-reflect.png");
resize_image("1px-border.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/1px-border-clamp.png");
// sRGB tests
resize_image("gamma_colors.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_colors.jpg");
resize_image("gamma_2.2.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_2.2.jpg");
resize_image("gamma_dalai_lama_gray.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_dalai_lama_gray.jpg");
}

5
tests/resample_test_c.c Normal file
View File

@ -0,0 +1,5 @@
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#define STB_IMAGE_RESIZE_STATIC
#include "stb_image_resize.h"
// Just to make sure it will build properly with a c compiler

93
tests/resize.dsp Normal file
View File

@ -0,0 +1,93 @@
# Microsoft Developer Studio Project File - Name="resize" - Package Owner=<4>
# Microsoft Developer Studio Generated Build File, Format Version 6.00
# ** DO NOT EDIT **
# TARGTYPE "Win32 (x86) Console Application" 0x0103
CFG=resize - Win32 Debug
!MESSAGE This is not a valid makefile. To build this project using NMAKE,
!MESSAGE use the Export Makefile command and run
!MESSAGE
!MESSAGE NMAKE /f "resize.mak".
!MESSAGE
!MESSAGE You can specify a configuration when running NMAKE
!MESSAGE by defining the macro CFG on the command line. For example:
!MESSAGE
!MESSAGE NMAKE /f "resize.mak" CFG="resize - Win32 Debug"
!MESSAGE
!MESSAGE Possible choices for configuration are:
!MESSAGE
!MESSAGE "resize - Win32 Release" (based on "Win32 (x86) Console Application")
!MESSAGE "resize - Win32 Debug" (based on "Win32 (x86) Console Application")
!MESSAGE
# Begin Project
# PROP AllowPerConfigDependencies 0
# PROP Scc_ProjName ""
# PROP Scc_LocalPath ""
CPP=cl.exe
RSC=rc.exe
!IF "$(CFG)" == "resize - Win32 Release"
# PROP BASE Use_MFC 0
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# PROP BASE Output_Dir "Release"
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# 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 /G6 /W3 /GX /Z7 /O2 /I ".." /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
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# 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
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# Begin Target
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10
tests/stb.dsp
View File

@ -66,7 +66,7 @@ LINK32=link.exe
# PROP Ignore_Export_Lib 0
# PROP Target_Dir ""
# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
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# ADD CPP /nologo /MTd /W3 /GX /Zi /Od /I ".." /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /D "TT_TEST" /FR /FD /GZ /c
# SUBTRACT CPP /YX
# ADD BASE RSC /l 0x409 /d "_DEBUG"
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@ -106,10 +106,18 @@ SOURCE=..\stb_dxt.h
# End Source File
# Begin Source File
SOURCE=..\stb_herringbone_wang_tile.h
# End Source File
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SOURCE=..\stb_image.h
# End Source File
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SOURCE=..\stb_image_resize.h
# End Source File
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SOURCE=..\stb_image_write.h
# End Source File
# Begin Source File

12
tests/stb.dsw
View File

@ -63,6 +63,18 @@ Package=<4>
###############################################################################
Project: "resize"=.\resize\resize.dsp - Package Owner=<4>
Package=<5>
{{{
}}}
Package=<4>
{{{
}}}
###############################################################################
Project: "stb"=.\stb.dsp - Package Owner=<4>
Package=<5>

8
tests/test_c_compilation.c
View File

@ -5,6 +5,7 @@
#define STB_DIVIDE_IMPLEMENTATION
#define STB_IMAGE_IMPLEMENTATION
#define STB_HERRINGBONE_WANG_TILE_IMEPLEMENTATIOn
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#include "stb_herringbone_wang_tile.h"
#include "stb_image.h"
@ -13,3 +14,10 @@
#include "stb_dxt.h"
#include "stb_c_lexer.h"
#include "stb_divide.h"
#include "stb_image_resize.h"
#define STBTE_DRAW_RECT(x0,y0,x1,y1,color) 0
#define STBTE_DRAW_TILE(x,y,id,highlight) 0
#define STB_TILEMAP_EDITOR_IMPLEMENTATION
#include "stb_tilemap_editor.h"

5
tests/test_cpp_compilation.cpp
View File

@ -15,3 +15,8 @@
#include "stb_divide.h"
#include "stb_image.h"
#include "stb_herringbone_wang_tile.h"
#define STBTE_DRAW_RECT(x0,y0,x1,y1,color)
#define STBTE_DRAW_TILE(x,y,id,highlight)
#define STB_TILEMAP_EDITOR_IMPLEMENTATION
#include "stb_tilemap_editor.h"

13
tests/test_truetype.c
View File

@ -4,14 +4,27 @@
#include <stdio.h>
char ttf_buffer[1<<25];
unsigned char output[512*100];
#ifdef TT_TEST
void debug(void)
{
stbtt_fontinfo font;
fread(ttf_buffer, 1, 1<<25, fopen("c:/x/lm/LiberationMono-Regular.ttf", "rb"));
stbtt_InitFont(&font, ttf_buffer, 0);
stbtt_MakeGlyphBitmap(&font, output, 6, 9, 512, 5.172414E-03f, 5.172414E-03f, 54);
}
int main(int argc, char **argv)
{
stbtt_fontinfo font;
unsigned char *bitmap;
int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 34807), s = (argc > 2 ? atoi(argv[2]) : 32);
debug();
fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/mingliu.ttc", "rb"));
stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));

26
tools/README.list
View File

@ -1,12 +1,14 @@
stb_vorbis.c | audio | decode ogg vorbis files from file/memory to float/16-bit signed output
stb_image.h | graphics | image loading/decoding from file/memory: JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC
stb_truetype.h | graphics | parse, decode, and rasterize characters from truetype fonts
stb_image_write.h | graphics | image writing to disk: PNG, TGA, BMP
stretchy_buffer.h | utility | typesafe dynamic array for C (i.e. approximation to vector<>), doesn't compile as C++
stb_textedit.h | UI | guts of a text editor for games etc implementing them from scratch
stb_dxt.h | 3D graphics | Fabian "ryg" Giesen's real-time DXT compressor
stb_herringbone_wang_tile.h | games | herringbone Wang tile map generator
stb_perlin.h | 3D graphics | revised Perlin noise (3D input, 1D output)
stb_c_lexer.h | parsing | simplify writing parsers for C-like languages
stb_divide.h | math | more useful 32-bit modulus e.g. "euclidean divide"
stb.h | misc | helper functions for C, mostly redundant in C++; basically author's personal stuff
stb_vorbis.c | audio | decode ogg vorbis files from file/memory to float/16-bit signed output
stb_image.h | graphics | image loading/decoding from file/memory: JPG, PNG, TGA, BMP, PSD, GIF, HDR, PIC
stb_truetype.h | graphics | parse, decode, and rasterize characters from truetype fonts
stb_image_write.h | graphics | image writing to disk: PNG, TGA, BMP
stb_image_resize.h | graphics | resize images larger/smaller with good quality
stretchy_buffer.h | utility | typesafe dynamic array for C (i.e. approximation to vector<>), doesn't compile as C++
stb_textedit.h | UI | guts of a text editor for games etc implementing them from scratch
stb_dxt.h | 3D graphics | Fabian "ryg" Giesen's real-time DXT compressor
stb_perlin.h | 3D graphics | revised Perlin noise (3D input, 1D output)
stb_tilemap_editor.h | games | embeddable tilemap editor
stb_herringbone_wang_tile.h | games | herringbone Wang tile map generator
stb_c_lexer.h | parsing | simplify writing parsers for C-like languages
stb_divide.h | math | more useful 32-bit modulus e.g. "euclidean divide"
stb.h | misc | helper functions for C, mostly redundant in C++; basically author's personal stuff

4
tools/make_readme.dsp
View File

@ -84,5 +84,9 @@ LINK32=link.exe
SOURCE=.\make_readme.c
# End Source File
# Begin Source File
SOURCE=.\README.list
# End Source File
# End Target
# End Project