embed fonts

include/blt/gfx/imgui/ImGuiUtils.h

@@ -1,11 +1,17 @@
 #pragma once
 
 #include "IconsFontAwesome5.h" // from https://github.com/juliettef/IconFontCppHeaders
+#include "imgui_spectrum.h"
 #include <imgui.h>
+#include <cmath>
 
+extern const char fontAwesomeRegular_compressed_data_base85[];
+extern const unsigned int fontAwesomeSolid_compressed_data[];
+extern const unsigned int fontAwesomeSolid_compressed_size;
+extern const unsigned int fontAwesomeBrands_compressed_size;
+extern const unsigned int fontAwesomeBrands_compressed_data[];
 namespace ImGui
 {
-
     
     inline void SetupImGuiStyle( bool bStyleDark_, float alpha_  )
     {
@@ -178,7 +184,7 @@ namespace ImGui
 
         int GetBin( float time_ )
         {
-            int bin = (int)floor( time_ / dT  );
+            int bin = (int)std::floor( time_ / dT  );
             if( bin >= NUM )
             {
                 bin = NUM - 1;

include/blt/gfx/imgui/imgui_spectrum.h

@@ -0,0 +1,212 @@
+#pragma once
+
+/*
+Color definitions in ImGui are a good starting point, 
+but do not cover all the intricacies of Spectrum's possible colors
+in controls and widgets. 
+
+One big difference is that ImGui communicates widget activity 
+(hover, pressed) with their background, while spectrum uses a mix
+of background and border, with border being the most common choice.
+
+Because of this, we reference extra colors in spectrum from 
+imgui.cpp and imgui_widgets.cpp directly, and to make that work, 
+we need to have them defined at here at compile time. 
+*/
+
+/// Pick one, or have one defined already.
+#if !defined(SPECTRUM_USE_LIGHT_THEME) && !defined(SPECTRUM_USE_DARK_THEME)
+#define SPECTRUM_USE_DARK_THEME
+//#define SPECTRUM_USE_DARK_THEME
+#endif
+
+namespace ImGui {
+    namespace Spectrum {
+        // a list of changes introduced to change the look of the widgets. 
+        // Collected here as const rather than being magic numbers spread 
+        // around imgui.cpp and imgui_widgets.cpp.
+        const float CHECKBOX_BORDER_SIZE = 2.0f;
+        const float CHECKBOX_ROUNDING = 2.0f;
+
+        // Load SourceSansProRegular and sets it as a default font.
+        // You may want to call ImGui::GetIO().Fonts->Clear() before this
+        void LoadFont(float size = 16.0f);
+
+        // Sets the ImGui style to Spectrum
+        void StyleColorsSpectrum();
+
+        namespace { // Unnamed namespace, since we only use this here. 
+            unsigned int Color(unsigned int c) {
+                // add alpha.
+                // also swap red and blue channel for some reason.
+                // todo: figure out why, and fix it.
+                const short a = 0xFF;
+                const short r = (c >> 16) & 0xFF;
+                const short g = (c >> 8) & 0xFF;
+                const short b = (c >> 0) & 0xFF;
+                return(a << 24)
+                    | (r << 0)
+                    | (g << 8)
+                    | (b << 16);
+            }
+        }
+        // all colors are from http://spectrum.corp.adobe.com/color.html
+
+        inline unsigned int color_alpha(unsigned int alpha, unsigned int c) {
+            return ((alpha & 0xFF) << 24) | (c & 0x00FFFFFF);
+        }
+
+        namespace Static { // static colors
+            const unsigned int NONE = 0x00000000; // transparent
+            const unsigned int WHITE = Color(0xFFFFFF);
+            const unsigned int BLACK = Color(0x000000);
+            const unsigned int GRAY200 = Color(0xF4F4F4);
+            const unsigned int GRAY300 = Color(0xEAEAEA);
+            const unsigned int GRAY400 = Color(0xD3D3D3);
+            const unsigned int GRAY500 = Color(0xBCBCBC);
+            const unsigned int GRAY600 = Color(0x959595);
+            const unsigned int GRAY700 = Color(0x767676);
+            const unsigned int GRAY800 = Color(0x505050);
+            const unsigned int GRAY900 = Color(0x323232);
+            const unsigned int BLUE400 = Color(0x378EF0);
+            const unsigned int BLUE500 = Color(0x2680EB);
+            const unsigned int BLUE600 = Color(0x1473E6);
+            const unsigned int BLUE700 = Color(0x0D66D0);
+            const unsigned int RED400 = Color(0xEC5B62);
+            const unsigned int RED500 = Color(0xE34850);
+            const unsigned int RED600 = Color(0xD7373F);
+            const unsigned int RED700 = Color(0xC9252D);
+            const unsigned int ORANGE400 = Color(0xF29423);
+            const unsigned int ORANGE500 = Color(0xE68619);
+            const unsigned int ORANGE600 = Color(0xDA7B11);
+            const unsigned int ORANGE700 = Color(0xCB6F10);
+            const unsigned int GREEN400 = Color(0x33AB84);
+            const unsigned int GREEN500 = Color(0x2D9D78);
+            const unsigned int GREEN600 = Color(0x268E6C);
+            const unsigned int GREEN700 = Color(0x12805C);
+        }
+
+#ifdef SPECTRUM_USE_LIGHT_THEME
+        const unsigned int GRAY50 = Color(0xFFFFFF);
+        const unsigned int GRAY75 = Color(0xFAFAFA);
+        const unsigned int GRAY100 = Color(0xF5F5F5);
+        const unsigned int GRAY200 = Color(0xEAEAEA);
+        const unsigned int GRAY300 = Color(0xE1E1E1);
+        const unsigned int GRAY400 = Color(0xCACACA);
+        const unsigned int GRAY500 = Color(0xB3B3B3);
+        const unsigned int GRAY600 = Color(0x8E8E8E);
+        const unsigned int GRAY700 = Color(0x707070);
+        const unsigned int GRAY800 = Color(0x4B4B4B);
+        const unsigned int GRAY900 = Color(0x2C2C2C);
+        const unsigned int BLUE400 = Color(0x2680EB);
+        const unsigned int BLUE500 = Color(0x1473E6);
+        const unsigned int BLUE600 = Color(0x0D66D0);
+        const unsigned int BLUE700 = Color(0x095ABA);
+        const unsigned int RED400 = Color(0xE34850);
+        const unsigned int RED500 = Color(0xD7373F);
+        const unsigned int RED600 = Color(0xC9252D);
+        const unsigned int RED700 = Color(0xBB121A);
+        const unsigned int ORANGE400 = Color(0xE68619);
+        const unsigned int ORANGE500 = Color(0xDA7B11);
+        const unsigned int ORANGE600 = Color(0xCB6F10);
+        const unsigned int ORANGE700 = Color(0xBD640D);
+        const unsigned int GREEN400 = Color(0x2D9D78);
+        const unsigned int GREEN500 = Color(0x268E6C);
+        const unsigned int GREEN600 = Color(0x12805C);
+        const unsigned int GREEN700 = Color(0x107154);
+        const unsigned int INDIGO400 = Color(0x6767EC);
+        const unsigned int INDIGO500 = Color(0x5C5CE0);
+        const unsigned int INDIGO600 = Color(0x5151D3);
+        const unsigned int INDIGO700 = Color(0x4646C6);
+        const unsigned int CELERY400 = Color(0x44B556);
+        const unsigned int CELERY500 = Color(0x3DA74E);
+        const unsigned int CELERY600 = Color(0x379947);
+        const unsigned int CELERY700 = Color(0x318B40);
+        const unsigned int MAGENTA400 = Color(0xD83790);
+        const unsigned int MAGENTA500 = Color(0xCE2783);
+        const unsigned int MAGENTA600 = Color(0xBC1C74);
+        const unsigned int MAGENTA700 = Color(0xAE0E66);
+        const unsigned int YELLOW400 = Color(0xDFBF00);
+        const unsigned int YELLOW500 = Color(0xD2B200);
+        const unsigned int YELLOW600 = Color(0xC4A600);
+        const unsigned int YELLOW700 = Color(0xB79900);
+        const unsigned int FUCHSIA400 = Color(0xC038CC);
+        const unsigned int FUCHSIA500 = Color(0xB130BD);
+        const unsigned int FUCHSIA600 = Color(0xA228AD);
+        const unsigned int FUCHSIA700 = Color(0x93219E);
+        const unsigned int SEAFOAM400 = Color(0x1B959A);
+        const unsigned int SEAFOAM500 = Color(0x16878C);
+        const unsigned int SEAFOAM600 = Color(0x0F797D);
+        const unsigned int SEAFOAM700 = Color(0x096C6F);
+        const unsigned int CHARTREUSE400 = Color(0x85D044);
+        const unsigned int CHARTREUSE500 = Color(0x7CC33F);
+        const unsigned int CHARTREUSE600 = Color(0x73B53A);
+        const unsigned int CHARTREUSE700 = Color(0x6AA834);
+        const unsigned int PURPLE400 = Color(0x9256D9);
+        const unsigned int PURPLE500 = Color(0x864CCC);
+        const unsigned int PURPLE600 = Color(0x7A42BF);
+        const unsigned int PURPLE700 = Color(0x6F38B1);
+#endif
+#ifdef SPECTRUM_USE_DARK_THEME
+        const unsigned int GRAY50 = Color(0x252525);
+        const unsigned int GRAY75 = Color(0x2F2F2F);
+        const unsigned int GRAY100 = Color(0x323232);
+        const unsigned int GRAY200 = Color(0x393939);
+        const unsigned int GRAY300 = Color(0x3E3E3E);
+        const unsigned int GRAY400 = Color(0x4D4D4D);
+        const unsigned int GRAY500 = Color(0x5C5C5C);
+        const unsigned int GRAY600 = Color(0x7B7B7B);
+        const unsigned int GRAY700 = Color(0x999999);
+        const unsigned int GRAY800 = Color(0xCDCDCD);
+        const unsigned int GRAY900 = Color(0xFFFFFF);
+        const unsigned int BLUE400 = Color(0x2680EB);
+        const unsigned int BLUE500 = Color(0x378EF0);
+        const unsigned int BLUE600 = Color(0x4B9CF5);
+        const unsigned int BLUE700 = Color(0x5AA9FA);
+        const unsigned int RED400 = Color(0xE34850);
+        const unsigned int RED500 = Color(0xEC5B62);
+        const unsigned int RED600 = Color(0xF76D74);
+        const unsigned int RED700 = Color(0xFF7B82);
+        const unsigned int ORANGE400 = Color(0xE68619);
+        const unsigned int ORANGE500 = Color(0xF29423);
+        const unsigned int ORANGE600 = Color(0xF9A43F);
+        const unsigned int ORANGE700 = Color(0xFFB55B);
+        const unsigned int GREEN400 = Color(0x2D9D78);
+        const unsigned int GREEN500 = Color(0x33AB84);
+        const unsigned int GREEN600 = Color(0x39B990);
+        const unsigned int GREEN700 = Color(0x3FC89C);
+        const unsigned int INDIGO400 = Color(0x6767EC);
+        const unsigned int INDIGO500 = Color(0x7575F1);
+        const unsigned int INDIGO600 = Color(0x8282F6);
+        const unsigned int INDIGO700 = Color(0x9090FA);
+        const unsigned int CELERY400 = Color(0x44B556);
+        const unsigned int CELERY500 = Color(0x4BC35F);
+        const unsigned int CELERY600 = Color(0x51D267);
+        const unsigned int CELERY700 = Color(0x58E06F);
+        const unsigned int MAGENTA400 = Color(0xD83790);
+        const unsigned int MAGENTA500 = Color(0xE2499D);
+        const unsigned int MAGENTA600 = Color(0xEC5AAA);
+        const unsigned int MAGENTA700 = Color(0xF56BB7);
+        const unsigned int YELLOW400 = Color(0xDFBF00);
+        const unsigned int YELLOW500 = Color(0xEDCC00);
+        const unsigned int YELLOW600 = Color(0xFAD900);
+        const unsigned int YELLOW700 = Color(0xFFE22E);
+        const unsigned int FUCHSIA400 = Color(0xC038CC);
+        const unsigned int FUCHSIA500 = Color(0xCF3EDC);
+        const unsigned int FUCHSIA600 = Color(0xD951E5);
+        const unsigned int FUCHSIA700 = Color(0xE366EF);
+        const unsigned int SEAFOAM400 = Color(0x1B959A);
+        const unsigned int SEAFOAM500 = Color(0x20A3A8);
+        const unsigned int SEAFOAM600 = Color(0x23B2B8);
+        const unsigned int SEAFOAM700 = Color(0x26C0C7);
+        const unsigned int CHARTREUSE400 = Color(0x85D044);
+        const unsigned int CHARTREUSE500 = Color(0x8EDE49);
+        const unsigned int CHARTREUSE600 = Color(0x9BEC54);
+        const unsigned int CHARTREUSE700 = Color(0xA3F858);
+        const unsigned int PURPLE400 = Color(0x9256D9);
+        const unsigned int PURPLE500 = Color(0x9D64E1);
+        const unsigned int PURPLE600 = Color(0xA873E9);
+        const unsigned int PURPLE700 = Color(0xB483F0);
+#endif
+    }
+}

resources/fonts/binary_to_compressed_c.cpp

@@ -0,0 +1,388 @@
+// dear imgui
+// (binary_to_compressed_c.cpp)
+// Helper tool to turn a file into a C array, if you want to embed font data in your source code.
+
+// The data is first compressed with stb_compress() to reduce source code size,
+// then encoded in Base85 to fit in a string so we can fit roughly 4 bytes of compressed data into 5 bytes of source code (suggested by @mmalex)
+// (If we used 32-bit constants it would require take 11 bytes of source code to encode 4 bytes, and be endianness dependent)
+// Note that even with compression, the output array is likely to be bigger than the binary file..
+// Load compressed TTF fonts with ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF()
+
+// Build with, e.g:
+//   # cl.exe binary_to_compressed_c.cpp
+//   # g++ binary_to_compressed_c.cpp
+//   # clang++ binary_to_compressed_c.cpp
+// You can also find a precompiled Windows binary in the binary/demo package available from https://github.com/ocornut/imgui
+
+// Usage:
+//   binary_to_compressed_c.exe [-base85] [-nocompress] [-nostatic] <inputfile> <symbolname>
+// Usage example:
+//   # binary_to_compressed_c.exe myfont.ttf MyFont > myfont.cpp
+//   # binary_to_compressed_c.exe -base85 myfont.ttf MyFont > myfont.cpp
+
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+// stb_compress* from stb.h - declaration
+typedef unsigned int stb_uint;
+typedef unsigned char stb_uchar;
+stb_uint stb_compress(stb_uchar* out, stb_uchar* in, stb_uint len);
+
+static bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression, bool use_static);
+
+int main(int argc, char** argv)
+{
+    if (argc < 3)
+    {
+        printf("Syntax: %s [-base85] [-nocompress] [-nostatic] <inputfile> <symbolname>\n", argv[0]);
+        return 0;
+    }
+
+    int argn = 1;
+    bool use_base85_encoding = false;
+    bool use_compression = true;
+    bool use_static = true;
+    while (argn < (argc - 2) && argv[argn][0] == '-')
+    {
+        if (strcmp(argv[argn], "-base85") == 0) { use_base85_encoding = true; argn++; }
+        else if (strcmp(argv[argn], "-nocompress") == 0) { use_compression = false; argn++; }
+        else if (strcmp(argv[argn], "-nostatic") == 0) { use_static = false; argn++; }
+        else
+        {
+            fprintf(stderr, "Unknown argument: '%s'\n", argv[argn]);
+            return 1;
+        }
+    }
+
+    bool ret = binary_to_compressed_c(argv[argn], argv[argn + 1], use_base85_encoding, use_compression, use_static);
+    if (!ret)
+        fprintf(stderr, "Error opening or reading file: '%s'\n", argv[argn]);
+    return ret ? 0 : 1;
+}
+
+char Encode85Byte(unsigned int x)
+{
+    x = (x % 85) + 35;
+    return (char)((x >= '\\') ? x + 1 : x);
+}
+
+bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression, bool use_static)
+{
+    // Read file
+    FILE* f = fopen(filename, "rb");
+    if (!f) return false;
+    int data_sz;
+    if (fseek(f, 0, SEEK_END) || (data_sz = (int)ftell(f)) == -1 || fseek(f, 0, SEEK_SET)) { fclose(f); return false; }
+    char* data = new char[data_sz + 4];
+    if (fread(data, 1, data_sz, f) != (size_t)data_sz) { fclose(f); delete[] data; return false; }
+    memset((void*)(((char*)data) + data_sz), 0, 4);
+    fclose(f);
+
+    // Compress
+    int maxlen = data_sz + 512 + (data_sz >> 2) + sizeof(int); // total guess
+    char* compressed = use_compression ? new char[maxlen] : data;
+    int compressed_sz = use_compression ? stb_compress((stb_uchar*)compressed, (stb_uchar*)data, data_sz) : data_sz;
+    if (use_compression)
+        memset(compressed + compressed_sz, 0, maxlen - compressed_sz);
+
+    // Output as Base85 encoded
+    FILE* out = stdout;
+    fprintf(out, "// File: '%s' (%d bytes)\n", filename, (int)data_sz);
+    fprintf(out, "// Exported using binary_to_compressed_c.cpp\n");
+    const char* static_str = use_static ? "static " : "";
+    const char* compressed_str = use_compression ? "compressed_" : "";
+    if (use_base85_encoding)
+    {
+        fprintf(out, "%sconst char %s_%sdata_base85[%d+1] =\n    \"", static_str, symbol, compressed_str, (int)((compressed_sz + 3) / 4)*5);
+        char prev_c = 0;
+        for (int src_i = 0; src_i < compressed_sz; src_i += 4)
+        {
+            // This is made a little more complicated by the fact that ??X sequences are interpreted as trigraphs by old C/C++ compilers. So we need to escape pairs of ??.
+            unsigned int d = *(unsigned int*)(compressed + src_i);
+            for (unsigned int n5 = 0; n5 < 5; n5++, d /= 85)
+            {
+                char c = Encode85Byte(d);
+                fprintf(out, (c == '?' && prev_c == '?') ? "\\%c" : "%c", c);
+                prev_c = c;
+            }
+            if ((src_i % 112) == 112 - 4)
+                fprintf(out, "\"\n    \"");
+        }
+        fprintf(out, "\";\n\n");
+    }
+    else
+    {
+        fprintf(out, "%sconst unsigned int %s_%ssize = %d;\n", static_str, symbol, compressed_str, (int)compressed_sz);
+        fprintf(out, "%sconst unsigned int %s_%sdata[%d/4] =\n{", static_str, symbol, compressed_str, (int)((compressed_sz + 3) / 4)*4);
+        int column = 0;
+        for (int i = 0; i < compressed_sz; i += 4)
+        {
+            unsigned int d = *(unsigned int*)(compressed + i);
+            if ((column++ % 12) == 0)
+                fprintf(out, "\n    0x%08x, ", d);
+            else
+                fprintf(out, "0x%08x, ", d);
+        }
+        fprintf(out, "\n};\n\n");
+    }
+
+    // Cleanup
+    delete[] data;
+    if (use_compression)
+        delete[] compressed;
+    return true;
+}
+
+// stb_compress* from stb.h - definition
+
+////////////////////           compressor         ///////////////////////
+
+static stb_uint stb_adler32(stb_uint adler32, stb_uchar *buffer, stb_uint buflen)
+{
+    const unsigned long ADLER_MOD = 65521;
+    unsigned long s1 = adler32 & 0xffff, s2 = adler32 >> 16;
+    unsigned long blocklen, i;
+
+    blocklen = buflen % 5552;
+    while (buflen) {
+        for (i=0; i + 7 < blocklen; i += 8) {
+            s1 += buffer[0], s2 += s1;
+            s1 += buffer[1], s2 += s1;
+            s1 += buffer[2], s2 += s1;
+            s1 += buffer[3], s2 += s1;
+            s1 += buffer[4], s2 += s1;
+            s1 += buffer[5], s2 += s1;
+            s1 += buffer[6], s2 += s1;
+            s1 += buffer[7], s2 += s1;
+
+            buffer += 8;
+        }
+
+        for (; i < blocklen; ++i)
+            s1 += *buffer++, s2 += s1;
+
+        s1 %= ADLER_MOD, s2 %= ADLER_MOD;
+        buflen -= blocklen;
+        blocklen = 5552;
+    }
+    return (s2 << 16) + s1;
+}
+
+static unsigned int stb_matchlen(stb_uchar *m1, stb_uchar *m2, stb_uint maxlen)
+{
+    stb_uint i;
+    for (i=0; i < maxlen; ++i)
+        if (m1[i] != m2[i]) return i;
+    return i;
+}
+
+// simple implementation that just takes the source data in a big block
+
+static stb_uchar *stb__out;
+static FILE      *stb__outfile;
+static stb_uint   stb__outbytes;
+
+static void stb__write(unsigned char v)
+{
+    fputc(v, stb__outfile);
+    ++stb__outbytes;
+}
+
+//#define stb_out(v)    (stb__out ? *stb__out++ = (stb_uchar) (v) : stb__write((stb_uchar) (v)))
+#define stb_out(v)    do { if (stb__out) *stb__out++ = (stb_uchar) (v); else stb__write((stb_uchar) (v)); } while (0)
+
+static void stb_out2(stb_uint v) { stb_out(v >> 8); stb_out(v); }
+static void stb_out3(stb_uint v) { stb_out(v >> 16); stb_out(v >> 8); stb_out(v); }
+static void stb_out4(stb_uint v) { stb_out(v >> 24); stb_out(v >> 16); stb_out(v >> 8 ); stb_out(v); }
+
+static void outliterals(stb_uchar *in, int numlit)
+{
+    while (numlit > 65536) {
+        outliterals(in,65536);
+        in     += 65536;
+        numlit -= 65536;
+    }
+
+    if      (numlit ==     0)    ;
+    else if (numlit <=    32)    stb_out (0x000020 + numlit-1);
+    else if (numlit <=  2048)    stb_out2(0x000800 + numlit-1);
+    else /*  numlit <= 65536) */ stb_out3(0x070000 + numlit-1);
+
+    if (stb__out) {
+        memcpy(stb__out,in,numlit);
+        stb__out += numlit;
+    } else
+        fwrite(in, 1, numlit, stb__outfile);
+}
+
+static int stb__window = 0x40000; // 256K
+
+static int stb_not_crap(int best, int dist)
+{
+    return   ((best > 2  &&  dist <= 0x00100)
+        || (best > 5  &&  dist <= 0x04000)
+        || (best > 7  &&  dist <= 0x80000));
+}
+
+static  stb_uint stb__hashsize = 32768;
+
+// note that you can play with the hashing functions all you
+// want without needing to change the decompressor
+#define stb__hc(q,h,c)      (((h) << 7) + ((h) >> 25) + q[c])
+#define stb__hc2(q,h,c,d)   (((h) << 14) + ((h) >> 18) + (q[c] << 7) + q[d])
+#define stb__hc3(q,c,d,e)   ((q[c] << 14) + (q[d] << 7) + q[e])
+
+static unsigned int stb__running_adler;
+
+static int stb_compress_chunk(stb_uchar *history,
+    stb_uchar *start,
+    stb_uchar *end,
+    int length,
+    int *pending_literals,
+    stb_uchar **chash,
+    stb_uint mask)
+{
+    (void)history;
+    int window = stb__window;
+    stb_uint match_max;
+    stb_uchar *lit_start = start - *pending_literals;
+    stb_uchar *q = start;
+
+#define STB__SCRAMBLE(h)   (((h) + ((h) >> 16)) & mask)
+
+    // stop short of the end so we don't scan off the end doing
+    // the hashing; this means we won't compress the last few bytes
+    // unless they were part of something longer
+    while (q < start+length && q+12 < end) {
+        int m;
+        stb_uint h1,h2,h3,h4, h;
+        stb_uchar *t;
+        int best = 2, dist=0;
+
+        if (q+65536 > end)
+            match_max = (stb_uint)(end-q);
+        else
+            match_max = 65536;
+
+#define stb__nc(b,d)  ((d) <= window && ((b) > 9 || stb_not_crap((int)(b),(int)(d))))
+
+#define STB__TRY(t,p)  /* avoid retrying a match we already tried */ \
+    if (p ? dist != (int)(q-t) : 1)                             \
+    if ((m = stb_matchlen(t, q, match_max)) > best)     \
+    if (stb__nc(m,q-(t)))                                \
+    best = m, dist = (int)(q - (t))
+
+        // rather than search for all matches, only try 4 candidate locations,
+        // chosen based on 4 different hash functions of different lengths.
+        // this strategy is inspired by LZO; hashing is unrolled here using the
+        // 'hc' macro
+        h = stb__hc3(q,0, 1, 2); h1 = STB__SCRAMBLE(h);
+        t = chash[h1]; if (t) STB__TRY(t,0);
+        h = stb__hc2(q,h, 3, 4); h2 = STB__SCRAMBLE(h);
+        h = stb__hc2(q,h, 5, 6);        t = chash[h2]; if (t) STB__TRY(t,1);
+        h = stb__hc2(q,h, 7, 8); h3 = STB__SCRAMBLE(h);
+        h = stb__hc2(q,h, 9,10);        t = chash[h3]; if (t) STB__TRY(t,1);
+        h = stb__hc2(q,h,11,12); h4 = STB__SCRAMBLE(h);
+        t = chash[h4]; if (t) STB__TRY(t,1);
+
+        // because we use a shared hash table, can only update it
+        // _after_ we've probed all of them
+        chash[h1] = chash[h2] = chash[h3] = chash[h4] = q;
+
+        if (best > 2)
+            assert(dist > 0);
+
+        // see if our best match qualifies
+        if (best < 3) { // fast path literals
+            ++q;
+        } else if (best > 2  &&  best <= 0x80    &&  dist <= 0x100) {
+            outliterals(lit_start, (int)(q-lit_start)); lit_start = (q += best);
+            stb_out(0x80 + best-1);
+            stb_out(dist-1);
+        } else if (best > 5  &&  best <= 0x100   &&  dist <= 0x4000) {
+            outliterals(lit_start, (int)(q-lit_start)); lit_start = (q += best);
+            stb_out2(0x4000 + dist-1);
+            stb_out(best-1);
+        } else if (best > 7  &&  best <= 0x100   &&  dist <= 0x80000) {
+            outliterals(lit_start, (int)(q-lit_start)); lit_start = (q += best);
+            stb_out3(0x180000 + dist-1);
+            stb_out(best-1);
+        } else if (best > 8  &&  best <= 0x10000 &&  dist <= 0x80000) {
+            outliterals(lit_start, (int)(q-lit_start)); lit_start = (q += best);
+            stb_out3(0x100000 + dist-1);
+            stb_out2(best-1);
+        } else if (best > 9                      &&  dist <= 0x1000000) {
+            if (best > 65536) best = 65536;
+            outliterals(lit_start, (int)(q-lit_start)); lit_start = (q += best);
+            if (best <= 0x100) {
+                stb_out(0x06);
+                stb_out3(dist-1);
+                stb_out(best-1);
+            } else {
+                stb_out(0x04);
+                stb_out3(dist-1);
+                stb_out2(best-1);
+            }
+        } else {  // fallback literals if no match was a balanced tradeoff
+            ++q;
+        }
+    }
+
+    // if we didn't get all the way, add the rest to literals
+    if (q-start < length)
+        q = start+length;
+
+    // the literals are everything from lit_start to q
+    *pending_literals = (int)(q - lit_start);
+
+    stb__running_adler = stb_adler32(stb__running_adler, start, (stb_uint)(q - start));
+    return (int)(q - start);
+}
+
+static int stb_compress_inner(stb_uchar *input, stb_uint length)
+{
+    int literals = 0;
+    stb_uint len,i;
+
+    stb_uchar **chash;
+    chash = (stb_uchar**) malloc(stb__hashsize * sizeof(stb_uchar*));
+    if (chash == nullptr) return 0; // failure
+    for (i=0; i < stb__hashsize; ++i)
+        chash[i] = nullptr;
+
+    // stream signature
+    stb_out(0x57); stb_out(0xbc);
+    stb_out2(0);
+
+    stb_out4(0);       // 64-bit length requires 32-bit leading 0
+    stb_out4(length);
+    stb_out4(stb__window);
+
+    stb__running_adler = 1;
+
+    len = stb_compress_chunk(input, input, input+length, length, &literals, chash, stb__hashsize-1);
+    assert(len == length);
+
+    outliterals(input+length - literals, literals);
+
+    free(chash);
+
+    stb_out2(0x05fa); // end opcode
+
+    stb_out4(stb__running_adler);
+
+    return 1; // success
+}
+
+stb_uint stb_compress(stb_uchar *out, stb_uchar *input, stb_uint length)
+{
+    stb__out = out;
+    stb__outfile = nullptr;
+
+    stb_compress_inner(input, length);
+
+    return (stb_uint)(stb__out - out);
+}

src/blt/gfx/window.cpp

@@ -11,7 +11,7 @@
 #include <imgui.h>
 #include "backends/imgui_impl_opengl3.h"
 #include "backends/imgui_impl_glfw.h"
-#include <blt/gfx/imgui/IconsFontAwesome5.h>
+#include <blt/gfx/imgui/ImGuiUtils.h>
 
 void error_callback(int error, const char* description)
 {
@@ -98,12 +98,26 @@ namespace blt::gfx
         IMGUI_CHECKVERSION();
         ImGui::CreateContext();
         ImGuiIO& io = ImGui::GetIO();
-        (void) io;
         io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
         io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
         
         // Setup Dear ImGui style
         ImGui::StyleColorsDark();
+        //ImGui::Spectrum::StyleColorsSpectrum();
+        ImGui::Spectrum::LoadFont();
+        ImGui::SetupImGuiStyle(true, 1.0);
+        
+        // Setup FA
+        ImFontConfig config;
+        config.MergeMode = true;
+        config.GlyphMinAdvanceX = 13.0f; // Use if you want to make the icon monospaced
+        static const ImWchar icon_ranges[] = {ICON_MIN_FA, ICON_MAX_FA, 0};
+        io.Fonts->AddFontFromMemoryCompressedBase85TTF(fontAwesomeRegular_compressed_data_base85, 13.0f, &config, icon_ranges);
+        io.Fonts->AddFontFromMemoryCompressedTTF(fontAwesomeSolid_compressed_data, static_cast<int>(fontAwesomeSolid_compressed_size), 13.0, &config,
+                                                 icon_ranges);
+        io.Fonts->AddFontFromMemoryCompressedTTF(fontAwesomeBrands_compressed_data, static_cast<int>(fontAwesomeBrands_compressed_size), 13.0, &config,
+                                                 icon_ranges);
+        
         //ImGui::StyleColorsLight();
         
         // Setup Platform/Renderer backends
@@ -187,7 +201,7 @@ namespace blt::gfx
 #else
         /* -- General Loop -- */
         while (!glfwWindowShouldClose(window_state.window))
-            loop((void*)&data);
+            loop((void*) &data);
 #endif
     }
     

tests/src/main.cpp

@@ -2,6 +2,7 @@
 
 #include <blt/gfx/window.h>
 #include <imgui.h>
+#include "blt/gfx/imgui/IconsFontAwesome5.h"
 
 void init()
 {
@@ -11,6 +12,9 @@ void init()
 void update(std::int32_t width, std::int32_t height)
 {
     ImGui::ShowDemoWindow();
+    ImGui::Text("%s among %d items", ICON_FA_FILE, 0);
+    ImGui::Button(ICON_FA_SEARCH " Search");
+    ImGui::End();
 }
 
 int main()