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Updated stb_truetype 1.07 -> 1.08

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ocornut 2015-12-03 12:35:27 +00:00
parent fe2972e8b2
commit 730e8119fe
1 changed files with 39 additions and 24 deletions
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63
stb_truetype.h
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@ -1,4 +1,4 @@
// stb_truetype.h - v1.07 - public domain
// stb_truetype.h - v1.08 - public domain
// authored from 2009-2015 by Sean Barrett / RAD Game Tools
//
// This library processes TrueType files:
@ -39,13 +39,16 @@
// Omar Cornut
// github:aloucks
// Peter LaValle
// Sergey Popov
// Giumo X. Clanjor
// Higor Euripedes
//
// Misc other:
// Ryan Gordon
//
// VERSION HISTORY
//
// 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;
// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
@ -802,7 +805,16 @@ typedef struct
unsigned char *pixels;
} stbtt__bitmap;
STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata);
// rasterize a shape with quadratic beziers into a bitmap
STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into
float flatness_in_pixels, // allowable error of curve in pixels
stbtt_vertex *vertices, // array of vertices defining shape
int num_verts, // number of vertices in above array
float scale_x, float scale_y, // scale applied to input vertices
float shift_x, float shift_y, // translation applied to input vertices
int x_off, int y_off, // another translation applied to input
int invert, // if non-zero, vertically flip shape
void *userdata); // context for to STBTT_MALLOC
//////////////////////////////////////////////////////////////////////////////
//
@ -1684,7 +1696,7 @@ static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, i
//STBTT_assert(e->y0 <= start_point);
if (!z) return z;
z->fdx = dxdy;
z->fdy = (1/dxdy);
z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
z->fx = e->x0 + dxdy * (start_point - e->y0);
z->fx -= off_x;
z->direction = e->invert ? 1.0f : -1.0f;
@ -1745,7 +1757,7 @@ static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__ac
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
stbtt__hheap hh = { 0 };
stbtt__hheap hh = { 0, 0, 0 };
stbtt__active_edge *active = NULL;
int y,j=0;
int max_weight = (255 / vsubsample); // weight per vertical scanline
@ -1907,7 +1919,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
float dx = e->fdx;
float xb = x0 + dx;
float x_top, x_bottom;
float y0,y1;
float sy0,sy1;
float dy = e->fdy;
STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
@ -1916,17 +1928,17 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
// line with y_top, but that may be off the line segment.
if (e->sy > y_top) {
x_top = x0 + dx * (e->sy - y_top);
y0 = e->sy;
sy0 = e->sy;
} else {
x_top = x0;
y0 = y_top;
sy0 = y_top;
}
if (e->ey < y_bottom) {
x_bottom = x0 + dx * (e->ey - y_top);
y1 = e->ey;
sy1 = e->ey;
} else {
x_bottom = xb;
y1 = y_bottom;
sy1 = y_bottom;
}
if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
@ -1936,7 +1948,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
float height;
// simple case, only spans one pixel
int x = (int) x_top;
height = y1 - y0;
height = sy1 - sy0;
STBTT_assert(x >= 0 && x < len);
scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
@ -1947,9 +1959,9 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
if (x_top > x_bottom) {
// flip scanline vertically; signed area is the same
float t;
y0 = y_bottom - (y0 - y_top);
y1 = y_bottom - (y1 - y_top);
t = y0, y0 = y1, y1 = t;
sy0 = y_bottom - (sy0 - y_top);
sy1 = y_bottom - (sy1 - y_top);
t = sy0, sy0 = sy1, sy1 = t;
t = x_bottom, x_bottom = x_top, x_top = t;
dx = -dx;
dy = -dy;
@ -1963,7 +1975,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
sign = e->direction;
// area of the rectangle covered from y0..y_crossing
area = sign * (y_crossing-y0);
area = sign * (y_crossing-sy0);
// area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
@ -1976,9 +1988,9 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
STBTT_assert(fabs(area) <= 1.01f);
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (y1-y_crossing);
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
scanline_fill[x2] += sign * (y1-y0);
scanline_fill[x2] += sign * (sy1-sy0);
}
} else {
// if edge goes outside of box we're drawing, we require
@ -2048,7 +2060,7 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
(void)vsubsample;
stbtt__hheap hh = { 0 };
stbtt__hheap hh = { 0, 0, 0 };
stbtt__active_edge *active = NULL;
int y,j=0, i;
float scanline_data[129], *scanline, *scanline2;
@ -2088,11 +2100,13 @@ static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e,
// insert all edges that start before the bottom of this scanline
while (e->y0 <= scan_y_bottom) {
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 (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;
}
++e;
}
@ -2835,7 +2849,7 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fon
ranges[i].v_oversample = (unsigned char) spc->v_oversample;
for (j=0; j < ranges[i].num_chars; ++j) {
int x0,y0,x1,y1;
int codepoint = ranges[i].first_unicode_codepoint_in_range ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
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);
stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
scale * spc->h_oversample,
@ -2876,7 +2890,7 @@ STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt
if (r->was_packed) {
stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
int advance, lsb, x0,y0,x1,y1;
int codepoint = ranges[i].first_unicode_codepoint_in_range ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
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);
stbrp_coord pad = (stbrp_coord) spc->padding;
@ -3179,6 +3193,7 @@ STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *font_collection, const
// FULL VERSION HISTORY
//
// 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;
// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);