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stb_truetype: updated 1.08 > 1.10 + minor unused variable warning fix

This commit is contained in:
ocornut 2016-04-02 20:12:20 +02:00
parent c3376cd45c
commit 9945eecaf4
1 changed files with 59 additions and 32 deletions
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91
stb_truetype.h
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@ -1,4 +1,4 @@
// stb_truetype.h - v1.08 - public domain
// stb_truetype.h - v1.10 - public domain
// authored from 2009-2015 by Sean Barrett / RAD Game Tools
//
// This library processes TrueType files:
@ -21,6 +21,10 @@
// Mikko Mononen: compound shape support, more cmap formats
// Tor Andersson: kerning, subpixel rendering
//
// Misc other:
// Ryan Gordon
// Simon Glass
//
// Bug/warning reports/fixes:
// "Zer" on mollyrocket (with fix)
// Cass Everitt
@ -42,12 +46,13 @@
// Sergey Popov
// Giumo X. Clanjor
// Higor Euripedes
//
// Misc other:
// Ryan Gordon
// Thomas Fields
// Derek Vinyard
//
// VERSION HISTORY
//
// 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
// variant PackFontRanges to pack and render in separate phases;
@ -65,9 +70,9 @@
//
// LICENSE
//
// This software is in the public domain. Where that dedication is not
// recognized, you are granted a perpetual, irrevocable license to copy,
// distribute, and modify this file as you see fit.
// This software is dual-licensed to the public domain and under the following
// license: you are granted a perpetual, irrevocable license to copy, modify,
// publish, and distribute this file as you see fit.
//
// USAGE
//
@ -403,6 +408,11 @@ int main(int arg, char **argv)
#define STBTT_sqrt(x) sqrt(x)
#endif
#ifndef STBTT_fabs
#include <math.h>
#define STBTT_fabs(x) fabs(x)
#endif
// #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
#ifndef STBTT_malloc
#include <stdlib.h>
@ -626,7 +636,7 @@ STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
// The following structure is defined publically so you can declare one on
// the stack or as a global or etc, but you should treat it as opaque.
typedef struct stbtt_fontinfo
struct stbtt_fontinfo
{
void * userdata;
unsigned char * data; // pointer to .ttf file
@ -637,7 +647,7 @@ typedef struct stbtt_fontinfo
int loca,head,glyf,hhea,hmtx,kern; // 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
} stbtt_fontinfo;
};
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
// Given an offset into the file that defines a font, this function builds
@ -1556,7 +1566,7 @@ STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
STBTT_DEF 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;
int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
// e.g. space character
if (ix0) *ix0 = 0;
@ -1672,6 +1682,7 @@ static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, i
{
stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
STBTT_assert(z != NULL);
if (!z) return z;
// round dx down to avoid overshooting
@ -1693,6 +1704,7 @@ static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, i
{
stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
STBTT_assert(z != NULL);
//STBTT_assert(e->y0 <= start_point);
if (!z) return z;
z->fdx = dxdy;
@ -1817,21 +1829,23 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
while (e->y0 <= scan_y) {
if (e->y1 > scan_y) {
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
// find insertion point
if (active == NULL)
active = z;
else if (z->x < active->x) {
// insert at front
z->next = active;
active = z;
} else {
// find thing to insert AFTER
stbtt__active_edge *p = active;
while (p->next && p->next->x < z->x)
p = p->next;
// at this point, p->next->x is NOT < z->x
z->next = p->next;
p->next = z;
if (z != NULL) {
// find insertion point
if (active == NULL)
active = z;
else if (z->x < active->x) {
// insert at front
z->next = active;
active = z;
} else {
// find thing to insert AFTER
stbtt__active_edge *p = active;
while (p->next && p->next->x < z->x)
p = p->next;
// at this point, p->next->x is NOT < z->x
z->next = p->next;
p->next = z;
}
}
}
++e;
@ -1986,7 +2000,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
}
y_crossing += dy * (x2 - (x1+1));
STBTT_assert(fabs(area) <= 1.01f);
STBTT_assert(STBTT_fabs(area) <= 1.01f);
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
@ -2102,10 +2116,12 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
while (e->y0 <= scan_y_bottom) {
if (e->y0 != e->y1) {
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
STBTT_assert(z->ey >= scan_y_top);
// insert at front
z->next = active;
active = z;
if (z != NULL) {
STBTT_assert(z->ey >= scan_y_top);
// insert at front
z->next = active;
active = z;
}
}
++e;
}
@ -2121,7 +2137,7 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
int m;
sum += scanline2[i];
k = scanline[i] + sum;
k = (float) fabs(k)*255 + 0.5f;
k = (float) STBTT_fabs(k)*255 + 0.5f;
m = (int) k;
if (m > 255) m = 255;
result->pixels[j*result->stride + i] = (unsigned char) m;
@ -2422,7 +2438,10 @@ STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info
if (scale_x == 0) scale_x = scale_y;
if (scale_y == 0) {
if (scale_x == 0) return NULL;
if (scale_x == 0) {
STBTT_free(vertices, info->userdata);
return NULL;
}
scale_y = scale_x;
}
@ -2514,6 +2533,7 @@ STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // fo
float scale;
int x,y,bottom_y, i;
stbtt_fontinfo f;
f.userdata = NULL;
if (!stbtt_InitFont(&f, data, offset))
return -1;
STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
@ -2707,6 +2727,7 @@ static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_i
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
int safe_w = w - kernel_width;
int j;
STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
for (j=0; j < h; ++j) {
int i;
unsigned int total;
@ -2768,6 +2789,7 @@ static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_i
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
int safe_h = h - kernel_width;
int j;
STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
for (j=0; j < w; ++j) {
int i;
unsigned int total;
@ -2976,6 +2998,7 @@ STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontd
if (rects == NULL)
return 0;
info.userdata = spc->user_allocator_context;
stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
@ -3193,6 +3216,10 @@ STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *font_collection, const
// FULL VERSION HISTORY
//
// 1.10 (2016-04-02) allow user-defined fabs() replacement
// fix memory leak if fontsize=0.0
// fix warning from duplicate typedef
// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
// allow PackFontRanges to pack and render in separate phases;