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Updated STB libraries to latest (drift has been reduced with nothings/stb as most of our changes were merged). Using [DEAR IMGUI] markers when changed.
This commit is contained in:
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3 changed files with 87 additions and 34 deletions
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@ -1,7 +1,9 @@
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// [ImGui] this is a slightly modified version of stb_truetype.h 1.19. Those changes would need to be pushed into nothings/stb
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// grep for [ImGui] to find the changes.
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// [DEAR IMGUI]
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// This is a slightly modified version of stb_truetype.h 1.20.
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// Mostly fixing for compiler and static analyzer warnings.
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// Grep for [DEAR IMGUI] to find the changes.
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// stb_truetype.h - v1.19 - public domain
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// stb_truetype.h - v1.20 - public domain
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// authored from 2009-2016 by Sean Barrett / RAD Game Tools
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//
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// This library processes TrueType files:
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@ -52,6 +54,7 @@
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//
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// VERSION HISTORY
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//
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// 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
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// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
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// 1.18 (2018-01-29) add missing function
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// 1.17 (2017-07-23) make more arguments const; doc fix
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@ -78,7 +81,7 @@
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//
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// USAGE
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//
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// Include this file in whatever places neeed to refer to it. In ONE C/C++
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// Include this file in whatever places need to refer to it. In ONE C/C++
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// file, write:
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// #define STB_TRUETYPE_IMPLEMENTATION
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// before the #include of this file. This expands out the actual
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@ -250,8 +253,8 @@
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// Documentation & header file 520 LOC \___ 660 LOC documentation
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// Sample code 140 LOC /
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// Truetype parsing 620 LOC ---- 620 LOC TrueType
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// Software rasterization 240 LOC \ .
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// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
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// Software rasterization 240 LOC \
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// Curve tessellation 120 LOC \__ 550 LOC Bitmap creation
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// Bitmap management 100 LOC /
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// Baked bitmap interface 70 LOC /
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// Font name matching & access 150 LOC ---- 150
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@ -559,6 +562,8 @@ STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int p
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//
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// It's inefficient; you might want to c&p it and optimize it.
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STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap);
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// Query the font vertical metrics without having to create a font first.
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//////////////////////////////////////////////////////////////////////////////
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@ -644,6 +649,12 @@ STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h
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// To use with PackFontRangesGather etc., you must set it before calls
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// call to PackFontRangesGatherRects.
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STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip);
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// If skip != 0, this tells stb_truetype to skip any codepoints for which
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// there is no corresponding glyph. If skip=0, which is the default, then
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// codepoints without a glyph recived the font's "missing character" glyph,
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// typically an empty box by convention.
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STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above
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int char_index, // character to display
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float *xpos, float *ypos, // pointers to current position in screen pixel space
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@ -672,6 +683,7 @@ struct stbtt_pack_context {
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int height;
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int stride_in_bytes;
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int padding;
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int skip_missing;
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unsigned int h_oversample, v_oversample;
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unsigned char *pixels;
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void *nodes;
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@ -697,7 +709,7 @@ STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
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// file will only define one font and it always be at offset 0, so it will
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// return '0' for index 0, and -1 for all other indices.
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// The following structure is defined publically so you can declare one on
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// The following structure is defined publicly so you can declare one on
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// the stack or as a global or etc, but you should treat it as opaque.
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struct stbtt_fontinfo
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{
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@ -736,6 +748,7 @@ STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codep
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// and you want a speed-up, call this function with the character you're
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// going to process, then use glyph-based functions instead of the
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// codepoint-based functions.
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// Returns 0 if the character codepoint is not defined in the font.
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//////////////////////////////////////////////////////////////////////////////
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@ -823,7 +836,7 @@ STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, s
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// returns # of vertices and fills *vertices with the pointer to them
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// these are expressed in "unscaled" coordinates
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//
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// The shape is a series of countours. Each one starts with
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// The shape is a series of contours. Each one starts with
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// a STBTT_moveto, then consists of a series of mixed
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// STBTT_lineto and STBTT_curveto segments. A lineto
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// draws a line from previous endpoint to its x,y; a curveto
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@ -919,7 +932,7 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
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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);
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// These functions compute a discretized SDF field for a single character, suitable for storing
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// in a single-channel texture, sampling with bilinear filtering, and testing against
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// larger than some threshhold to produce scalable fonts.
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// larger than some threshold to produce scalable fonts.
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// info -- the font
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// scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap
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// glyph/codepoint -- the character to generate the SDF for
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@ -2371,7 +2384,7 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
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return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
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// [ImGui: commented to fix static analyzer warning]
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// [DEAR IMGUI] Commented to fix static analyzer warning
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//classDefTable = classDef1ValueArray + 2 * glyphCount;
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} break;
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@ -2396,7 +2409,7 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
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}
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// [ImGui: commented to fix static analyzer warning]
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// [DEAR IMGUI] Commented to fix static analyzer warning
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//classDefTable = classRangeRecords + 6 * classRangeCount;
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} break;
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@ -3029,6 +3042,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
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dx = -dx;
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dy = -dy;
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t = x0, x0 = xb, xb = t;
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// [DEAR IMGUI] Fix static analyzer warning
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(void)dx; // [ImGui: fix static analyzer warning]
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}
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@ -3167,7 +3181,13 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
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if (e->y0 != e->y1) {
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stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
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if (z != NULL) {
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STBTT_assert(z->ey >= scan_y_top);
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if (j == 0 && off_y != 0) {
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if (z->ey < scan_y_top) {
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// this can happen due to subpixel positioning and some kind of fp rounding error i think
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z->ey = scan_y_top;
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}
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}
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STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds
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// insert at front
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z->next = active;
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active = z;
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@ -3236,7 +3256,7 @@ static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
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static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
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{
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/* threshhold for transitioning to insertion sort */
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/* threshold for transitioning to insertion sort */
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while (n > 12) {
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stbtt__edge t;
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int c01,c12,c,m,i,j;
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@ -3371,7 +3391,7 @@ static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
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points[n].y = y;
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}
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// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
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// tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching
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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)
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{
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// midpoint
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@ -3796,6 +3816,7 @@ STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, in
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spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
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spc->h_oversample = 1;
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spc->v_oversample = 1;
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spc->skip_missing = 0;
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stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
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@ -3821,6 +3842,11 @@ STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h
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spc->v_oversample = v_oversample;
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}
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STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip)
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{
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spc->skip_missing = skip;
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}
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#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
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static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
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@ -3974,13 +4000,17 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stb
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int x0,y0,x1,y1;
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int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
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int glyph = stbtt_FindGlyphIndex(info, codepoint);
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stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
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scale * spc->h_oversample,
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scale * spc->v_oversample,
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0,0,
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&x0,&y0,&x1,&y1);
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rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
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rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
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if (glyph == 0 && spc->skip_missing) {
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rects[k].w = rects[k].h = 0;
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} else {
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stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
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scale * spc->h_oversample,
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scale * spc->v_oversample,
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0,0,
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&x0,&y0,&x1,&y1);
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rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
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rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
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}
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++k;
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}
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}
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@ -4033,7 +4063,7 @@ STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const
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sub_y = stbtt__oversample_shift(spc->v_oversample);
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for (j=0; j < ranges[i].num_chars; ++j) {
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stbrp_rect *r = &rects[k];
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if (r->was_packed) {
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if (r->was_packed && r->w != 0 && r->h != 0) {
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stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
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int advance, lsb, x0,y0,x1,y1;
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int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
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@ -4147,6 +4177,19 @@ STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *
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return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
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}
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STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap)
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{
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int i_ascent, i_descent, i_lineGap;
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float scale;
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stbtt_fontinfo info;
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stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index));
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scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size);
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stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap);
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*ascent = (float) i_ascent * scale;
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*descent = (float) i_descent * scale;
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*lineGap = (float) i_lineGap * scale;
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}
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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)
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{
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float ipw = 1.0f / pw, iph = 1.0f / ph;
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@ -4259,7 +4302,7 @@ static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex
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int winding = 0;
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orig[0] = x;
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//orig[1] = y; // [ImGui] commmented double assignment without reading
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//orig[1] = y; // [DEAR IMGUI] commmented double assignment
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// make sure y never passes through a vertex of the shape
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y_frac = (float) STBTT_fmod(y, 1.0f);
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