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[cairo] Add separate x/y scale factors

This commit is contained in:
Behdad Esfahbod 2022-12-27 17:46:25 -07:00
parent 50b7fff0c6
commit 81c04b0c21
3 changed files with 24 additions and 22 deletions
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41
src/hb-cairo.cc
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@ -458,11 +458,9 @@ hb_cairo_text_to_glyphs (cairo_scaled_font_t *scaled_font,
hb_buffer_guess_segment_properties (buffer);
hb_shape (font, buffer, nullptr, 0);
double scale_factor = font->x_scale;
hb_cairo_glyphs_from_buffer (buffer,
true,
scale_factor,
font->x_scale, font->y_scale,
0., 0.,
utf8, utf8_len,
glyphs, (unsigned *) num_glyphs,
@ -710,17 +708,17 @@ hb_cairo_scaled_font_get_font (cairo_scaled_font_t *scaled_font)
* When using the hb_cairo_glyphs_from_buffer() API to convert
* HarfBuzz glyph buffer resulted from shaping with such a hb_font_t,
* if the scale-factor was non-zero, you can pass it directly to
* that API. If the scale-factor was zero however, you need to
* calculate the correct scale-factor to pass to that API by
* dividing the #hb_font_t scale-factor by the cairo scaled-font's
* scale-matrix scale-factor. This assumes a uniform scale.
* that API as both X and Y scale factors.
*
* If the cairo-face was created using the alternative constructor
* hb_cairo_font_face_create_for_font(), you are on your own
* computing the correct scale-factor to pass to
* hb_cairo_glyphs_from_buffer(), but it is generally the x_scale
* of the #hb_font_t divided by the xx factor of the scaled-font's
* scale-matrix.
* If the scale-factor was zero however, or the cairo face was
* created using the alternative constructor
* hb_cairo_font_face_create_for_font(), you need to calculate the
* correct X/Y scale-factors to pass to hb_cairo_glyphs_from_buffer()
* by dividing the #hb_font_t X/Y scale-factors by the
* cairo scaled-font's scale-matrix XX/YY components respectively
* and use those values. Or if you know that relationship offhand
* (because you set the scale of the #hb_font_t yourself), use
* the conversation rate involved.
*
* Since: REPLACEME
*/
@ -758,7 +756,8 @@ hb_cairo_font_face_get_scale_factor (cairo_font_face_t *font_face)
* hb_cairo_glyphs_from_buffer:
* @buffer: a #hb_buffer_t containing glyphs
* @utf8_clusters: `true` to if @buffer clusters are in bytes, instead of characters
* @scale_factor: scale factor to divide hb_positions_t values by
* @x_scale_factor: scale factor to divide hb_positions_t Y values by
* @y_scale_factor: scale factor to divide hb_positions_t X values by
* @x: X position to place first glyph
* @y: Y position to place first glyph
* @utf8: (nullable): the text that was shaped in @buffer
@ -787,7 +786,8 @@ hb_cairo_font_face_get_scale_factor (cairo_font_face_t *font_face)
void
hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
hb_bool_t utf8_clusters,
double scale_factor,
double x_scale_factor,
double y_scale_factor,
double x,
double y,
const char *utf8,
@ -834,22 +834,23 @@ hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
return;
}
double iscale = scale_factor ? 1. / scale_factor : 0.;
double x_scale = x_scale_factor ? 1. / x_scale_factor : 0.;
double y_scale = y_scale_factor ? 1. / y_scale_factor : 0.;
hb_position_t hx = 0, hy = 0;
int i;
for (i = 0; i < (int) *num_glyphs; i++)
{
(*glyphs)[i].index = hb_glyph[i].codepoint;
(*glyphs)[i].x = x + (+hb_position->x_offset + hx) * iscale;
(*glyphs)[i].y = y + (-hb_position->y_offset + hy) * iscale;
(*glyphs)[i].x = x + (+hb_position->x_offset + hx) * x_scale;
(*glyphs)[i].y = y + (-hb_position->y_offset + hy) * y_scale;
hx += hb_position->x_advance;
hy += -hb_position->y_advance;
hb_position++;
}
(*glyphs)[i].index = -1;
(*glyphs)[i].x = round (hx * iscale);
(*glyphs)[i].y = round (hy * iscale);
(*glyphs)[i].x = round (hx * x_scale);
(*glyphs)[i].y = round (hy * y_scale);
if (clusters && *num_clusters)
{

3
src/hb-cairo.h
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@ -82,7 +82,8 @@ hb_cairo_font_face_get_scale_factor (cairo_font_face_t *font_face);
HB_EXTERN void
hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
hb_bool_t utf8_clusters,
double scale_factor,
double x_scale_factor,
double y_scale_factor,
double x,
double y,
const char *utf8,

2
util/helper-cairo.hh
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@ -606,7 +606,7 @@ helper_cairo_line_from_buffer (helper_cairo_line_t *l,
hb_cairo_glyphs_from_buffer (buffer,
utf8_clusters,
1 << -scale_bits,
1 << -scale_bits, 1 << -scale_bits,
0., 0.,
l->utf8, l->utf8_len,
&l->glyphs, &l->num_glyphs,