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update stb_truetype

This commit is contained in:
takase1121 2020-12-28 13:58:20 +08:00
parent 806f0e39e3
commit efa73e1ed1
1 changed files with 262 additions and 104 deletions
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246
src/lib/stb/stb_truetype.h
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@ -1,5 +1,14 @@
// stb_truetype.h - v1.19 - public domain
// authored from 2009-2016 by Sean Barrett / RAD Game Tools
// stb_truetype.h - v1.24 - public domain
// authored from 2009-2020 by Sean Barrett / RAD Game Tools
//
// =======================================================================
//
// NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES
//
// This library does no range checking of the offsets found in the file,
// meaning an attacker can use it to read arbitrary memory.
//
// =======================================================================
//
// This library processes TrueType files:
// parse files
@ -32,11 +41,11 @@
// Daniel Ribeiro Maciel
//
// Bug/warning reports/fixes:
// "Zer" on mollyrocket Fabian "ryg" Giesen
// Cass Everitt Martins Mozeiko
// stoiko (Haemimont Games) Cap Petschulat
// Brian Hook Omar Cornut
// Walter van Niftrik github:aloucks
// "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe
// Cass Everitt Martins Mozeiko github:aloucks
// stoiko (Haemimont Games) Cap Petschulat github:oyvindjam
// Brian Hook Omar Cornut github:vassvik
// Walter van Niftrik Ryan Griege
// David Gow Peter LaValle
// David Given Sergey Popov
// Ivan-Assen Ivanov Giumo X. Clanjor
@ -44,11 +53,16 @@
// Johan Duparc Thomas Fields
// Hou Qiming Derek Vinyard
// Rob Loach Cort Stratton
// Kenney Phillis Jr. github:oyvindjam
// Brian Costabile github:vassvik
// Kenney Phillis Jr. Brian Costabile
// Ken Voskuil (kaesve)
//
// VERSION HISTORY
//
// 1.24 (2020-02-05) fix warning
// 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
// 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
// 1.21 (2019-02-25) fix warning
// 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
// 1.18 (2018-01-29) add missing function
// 1.17 (2017-07-23) make more arguments const; doc fix
@ -75,7 +89,7 @@
//
// USAGE
//
// Include this file in whatever places neeed to refer to it. In ONE C/C++
// Include this file in whatever places need to refer to it. In ONE C/C++
// file, write:
// #define STB_TRUETYPE_IMPLEMENTATION
// before the #include of this file. This expands out the actual
@ -242,19 +256,6 @@
// recommend it.
//
//
// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
//
// Documentation & header file 520 LOC \___ 660 LOC documentation
// Sample code 140 LOC /
// Truetype parsing 620 LOC ---- 620 LOC TrueType
// Software rasterization 240 LOC \ .
// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
// Bitmap management 100 LOC /
// Baked bitmap interface 70 LOC /
// Font name matching & access 150 LOC ---- 150
// C runtime library abstraction 60 LOC ---- 60
//
//
// PERFORMANCE MEASUREMENTS FOR 1.06:
//
// 32-bit 64-bit
@ -556,6 +557,8 @@ STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int p
//
// It's inefficient; you might want to c&p it and optimize it.
STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap);
// Query the font vertical metrics without having to create a font first.
//////////////////////////////////////////////////////////////////////////////
@ -641,6 +644,12 @@ STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h
// To use with PackFontRangesGather etc., you must set it before calls
// call to PackFontRangesGatherRects.
STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip);
// If skip != 0, this tells stb_truetype to skip any codepoints for which
// there is no corresponding glyph. If skip=0, which is the default, then
// codepoints without a glyph recived the font's "missing character" glyph,
// typically an empty box by convention.
STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above
int char_index, // character to display
float *xpos, float *ypos, // pointers to current position in screen pixel space
@ -669,6 +678,7 @@ struct stbtt_pack_context {
int height;
int stride_in_bytes;
int padding;
int skip_missing;
unsigned int h_oversample, v_oversample;
unsigned char *pixels;
void *nodes;
@ -694,7 +704,7 @@ STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
// file will only define one font and it always be at offset 0, so it will
// return '0' for index 0, and -1 for all other indices.
// The following structure is defined publically so you can declare one on
// The following structure is defined publicly so you can declare one on
// the stack or as a global or etc, but you should treat it as opaque.
struct stbtt_fontinfo
{
@ -704,7 +714,7 @@ struct stbtt_fontinfo
int numGlyphs; // number of glyphs, needed for range checking
int loca,head,glyf,hhea,hmtx,kern,gpos; // table locations as offset from start of .ttf
int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
int index_map; // a cmap mapping for our chosen character encoding
int indexToLocFormat; // format needed to map from glyph index to glyph
@ -733,6 +743,7 @@ STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codep
// and you want a speed-up, call this function with the character you're
// going to process, then use glyph-based functions instead of the
// codepoint-based functions.
// Returns 0 if the character codepoint is not defined in the font.
//////////////////////////////////////////////////////////////////////////////
@ -786,6 +797,18 @@ STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1,
STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
// as above, but takes one or more glyph indices for greater efficiency
typedef struct stbtt_kerningentry
{
int glyph1; // use stbtt_FindGlyphIndex
int glyph2;
int advance;
} stbtt_kerningentry;
STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info);
STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length);
// Retrieves a complete list of all of the kerning pairs provided by the font
// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write.
// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1)
//////////////////////////////////////////////////////////////////////////////
//
@ -820,7 +843,7 @@ STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, s
// returns # of vertices and fills *vertices with the pointer to them
// these are expressed in "unscaled" coordinates
//
// The shape is a series of countours. Each one starts with
// The shape is a series of contours. Each one starts with
// a STBTT_moveto, then consists of a series of mixed
// STBTT_lineto and STBTT_curveto segments. A lineto
// draws a line from previous endpoint to its x,y; a curveto
@ -830,6 +853,11 @@ STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, s
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
// frees the data allocated above
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
// fills svg with the character's SVG data.
// returns data size or 0 if SVG not found.
//////////////////////////////////////////////////////////////////////////////
//
// BITMAP RENDERING
@ -916,7 +944,7 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
// These functions compute a discretized SDF field for a single character, suitable for storing
// in a single-channel texture, sampling with bilinear filtering, and testing against
// larger than some threshhold to produce scalable fonts.
// larger than some threshold to produce scalable fonts.
// info -- the font
// scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap
// glyph/codepoint -- the character to generate the SDF for
@ -1331,6 +1359,22 @@ static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict)
return stbtt__cff_get_index(&cff);
}
// since most people won't use this, find this table the first time it's needed
static int stbtt__get_svg(stbtt_fontinfo *info)
{
stbtt_uint32 t;
if (info->svg < 0) {
t = stbtt__find_table(info->data, info->fontstart, "SVG ");
if (t) {
stbtt_uint32 offset = ttULONG(info->data + t + 2);
info->svg = t + offset;
} else {
info->svg = 0;
}
}
return info->svg;
}
static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
{
stbtt_uint32 cmap, t;
@ -1410,6 +1454,8 @@ static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, in
else
info->numGlyphs = 0xffff;
info->svg = -1;
// find a cmap encoding table we understand *now* to avoid searching
// later. (todo: could make this installable)
// the same regardless of glyph.
@ -1758,7 +1804,7 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
}
}
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
} else if (numberOfContours == -1) {
} else if (numberOfContours < 0) {
// Compound shapes.
int more = 1;
stbtt_uint8 *comp = data + g + 10;
@ -1835,9 +1881,6 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
// More components ?
more = flags & (1<<5);
}
} else if (numberOfContours < 0) {
// @TODO other compound variations?
STBTT_assert(0);
} else {
// numberOfCounters == 0, do nothing
}
@ -2266,6 +2309,48 @@ STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_inde
}
}
STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info)
{
stbtt_uint8 *data = info->data + info->kern;
// we only look at the first table. it must be 'horizontal' and format 0.
if (!info->kern)
return 0;
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
return 0;
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
return 0;
return ttUSHORT(data+10);
}
STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length)
{
stbtt_uint8 *data = info->data + info->kern;
int k, length;
// we only look at the first table. it must be 'horizontal' and format 0.
if (!info->kern)
return 0;
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
return 0;
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
return 0;
length = ttUSHORT(data+10);
if (table_length < length)
length = table_length;
for (k = 0; k < length; k++)
{
table[k].glyph1 = ttUSHORT(data+18+(k*6));
table[k].glyph2 = ttUSHORT(data+20+(k*6));
table[k].advance = ttSHORT(data+22+(k*6));
}
return length;
}
static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
{
stbtt_uint8 *data = info->data + info->kern;
@ -2463,6 +2548,7 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
if (valueFormat2 != 0) return 0;
STBTT_assert(coverageIndex < pairSetCount);
STBTT__NOTUSED(pairSetCount);
needle=glyph2;
r=pairValueCount-1;
@ -2540,8 +2626,7 @@ STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int
if (info->gpos)
xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
if (info->kern)
else if (info->kern)
xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
return xAdvance;
@ -2602,6 +2687,45 @@ STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
STBTT_free(v, info->userdata);
}
STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
{
int i;
stbtt_uint8 *data = info->data;
stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info);
int numEntries = ttUSHORT(svg_doc_list);
stbtt_uint8 *svg_docs = svg_doc_list + 2;
for(i=0; i<numEntries; i++) {
stbtt_uint8 *svg_doc = svg_docs + (12 * i);
if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
return svg_doc;
}
return 0;
}
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg)
{
stbtt_uint8 *data = info->data;
stbtt_uint8 *svg_doc;
if (info->svg == 0)
return 0;
svg_doc = stbtt_FindSVGDoc(info, gl);
if (svg_doc != NULL) {
*svg = (char *) data + info->svg + ttULONG(svg_doc + 4);
return ttULONG(svg_doc + 8);
} else {
return 0;
}
}
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg)
{
return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg);
}
//////////////////////////////////////////////////////////////////////////////
//
// antialiasing software rasterizer
@ -3160,7 +3284,13 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
if (e->y0 != e->y1) {
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
if (z != NULL) {
STBTT_assert(z->ey >= scan_y_top);
if (j == 0 && off_y != 0) {
if (z->ey < scan_y_top) {
// this can happen due to subpixel positioning and some kind of fp rounding error i think
z->ey = scan_y_top;
}
}
STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds
// insert at front
z->next = active;
active = z;
@ -3229,7 +3359,7 @@ static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
{
/* threshhold for transitioning to insertion sort */
/* threshold for transitioning to insertion sort */
while (n > 12) {
stbtt__edge t;
int c01,c12,c,m,i,j;
@ -3364,7 +3494,7 @@ static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
points[n].y = y;
}
// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
// tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching
static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
{
// midpoint
@ -3789,6 +3919,7 @@ STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, in
spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
spc->h_oversample = 1;
spc->v_oversample = 1;
spc->skip_missing = 0;
stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
@ -3814,6 +3945,11 @@ STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h
spc->v_oversample = v_oversample;
}
STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip)
{
spc->skip_missing = skip;
}
#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
@ -3956,6 +4092,7 @@ static float stbtt__oversample_shift(int oversample)
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
{
int i,j,k;
int missing_glyph_added = 0;
k=0;
for (i=0; i < num_ranges; ++i) {
@ -3967,6 +4104,9 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stb
int x0,y0,x1,y1;
int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
int glyph = stbtt_FindGlyphIndex(info, codepoint);
if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) {
rects[k].w = rects[k].h = 0;
} else {
stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
scale * spc->h_oversample,
scale * spc->v_oversample,
@ -3974,6 +4114,9 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stb
&x0,&y0,&x1,&y1);
rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
if (glyph == 0)
missing_glyph_added = 1;
}
++k;
}
}
@ -4007,7 +4150,7 @@ STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info
// rects array must be big enough to accommodate all characters in the given ranges
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
{
int i,j,k, return_value = 1;
int i,j,k, missing_glyph = -1, return_value = 1;
// save current values
int old_h_over = spc->h_oversample;
@ -4026,7 +4169,7 @@ STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const
sub_y = stbtt__oversample_shift(spc->v_oversample);
for (j=0; j < ranges[i].num_chars; ++j) {
stbrp_rect *r = &rects[k];
if (r->was_packed) {
if (r->was_packed && r->w != 0 && r->h != 0) {
stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
int advance, lsb, x0,y0,x1,y1;
int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
@ -4072,6 +4215,13 @@ STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const
bc->yoff = (float) y0 * recip_v + sub_y;
bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
if (glyph == 0)
missing_glyph = j;
} else if (spc->skip_missing) {
return_value = 0;
} else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) {
ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph];
} else {
return_value = 0; // if any fail, report failure
}
@ -4140,6 +4290,19 @@ STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *
return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
}
STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap)
{
int i_ascent, i_descent, i_lineGap;
float scale;
stbtt_fontinfo info;
stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index));
scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size);
stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap);
*ascent = (float) i_ascent * scale;
*descent = (float) i_descent * scale;
*lineGap = (float) i_lineGap * scale;
}
STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
{
float ipw = 1.0f / pw, iph = 1.0f / ph;
@ -4360,12 +4523,7 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
int w,h;
unsigned char *data;
// if one scale is 0, use same scale for both
if (scale_x == 0) scale_x = scale_y;
if (scale_y == 0) {
if (scale_x == 0) return NULL; // if both scales are 0, return NULL
scale_y = scale_x;
}
if (scale == 0) return NULL;
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1);