mirror of https://github.com/nothings/stb.git
stb_truetype: allow getting font metrics without explicitly opening file
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@ -556,6 +556,8 @@ 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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@ -3160,7 +3162,13 @@ 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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@ -4140,6 +4148,19 @@ 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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