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[hb-ft] Only apply FT_Face's transform if we created FT_Face 

Fixes https://github.com/harfbuzz/harfbuzz/issues/3788

https://github.com/harfbuzz/harfbuzz/issues/3790
This commit is contained in:
Behdad Esfahbod 2022-08-19 09:48:12 -06:00
parent 4f59211762
commit 23461b7502
1 changed files with 65 additions and 30 deletions
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95
src/hb-ft.cc
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@ -87,6 +87,7 @@ struct hb_ft_font_t
int load_flags;
bool symbol; /* Whether selected cmap is symbol cmap. */
bool unref; /* Whether to destroy ft_face when done. */
bool transform; /* Whether to apply FT_Face's transform. */
mutable hb_mutex_t lock;
FT_Face ft_face;
@ -138,6 +139,8 @@ _hb_ft_font_destroy (void *data)
/* hb_font changed, update FT_Face. */
static void _hb_ft_hb_font_changed (hb_font_t *font, FT_Face ft_face)
{
hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;
float x_mult = 1.f, y_mult = 1.f;
if (font->x_scale < 0) x_mult = -x_mult;
@ -175,6 +178,7 @@ static void _hb_ft_hb_font_changed (hb_font_t *font, FT_Face ft_face)
FT_Matrix matrix = { (int) roundf (x_mult * (1<<16)), 0,
0, (int) roundf (y_mult * (1<<16))};
FT_Set_Transform (ft_face, &matrix, nullptr);
ft_font->transform = true;
}
#if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR)
@ -430,13 +434,19 @@ hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
int load_flags = ft_font->load_flags;
float x_mult;
#ifdef HAVE_FT_GET_TRANSFORM
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
float x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
#else
float x_mult = font->x_scale < 0 ? -1 : +1;
if (ft_font->transform)
{
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
}
else
#endif
{
x_mult = font->x_scale < 0 ? -1 : +1;
}
for (unsigned int i = 0; i < count; i++)
{
@ -468,13 +478,19 @@ hb_ft_get_glyph_v_advance (hb_font_t *font,
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
hb_lock_t lock (ft_font->lock);
FT_Fixed v;
float y_mult;
#ifdef HAVE_FT_GET_TRANSFORM
FT_Matrix matrix;
FT_Get_Transform (ft_font->ft_face, &matrix, nullptr);
float y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
#else
float y_mult = font->y_scale < 0 ? -1 : +1;
if (ft_font->transform)
{
FT_Matrix matrix;
FT_Get_Transform (ft_font->ft_face, &matrix, nullptr);
y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
}
else
#endif
{
y_mult = font->y_scale < 0 ? -1 : +1;
}
if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v)))
return 0;
@ -500,15 +516,21 @@ hb_ft_get_glyph_v_origin (hb_font_t *font,
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
float x_mult, y_mult;
#ifdef HAVE_FT_GET_TRANSFORM
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
float x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
float y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
#else
float x_mult = font->x_scale < 0 ? -1 : +1;
float y_mult = font->y_scale < 0 ? -1 : +1;
if (ft_font->transform)
{
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
}
else
#endif
{
x_mult = font->x_scale < 0 ? -1 : +1;
y_mult = font->y_scale < 0 ? -1 : +1;
}
if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
return false;
@ -555,15 +577,21 @@ hb_ft_get_glyph_extents (hb_font_t *font,
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
float x_mult, y_mult;
#ifdef HAVE_FT_GET_TRANSFORM
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
float x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
float y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
#else
float x_mult = font->x_scale < 0 ? -1 : +1;
float y_mult = font->y_scale < 0 ? -1 : +1;
if (ft_font->transform)
{
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
x_mult = sqrtf ((float)matrix.xx * matrix.xx + (float)matrix.xy * matrix.xy) / 65536.f;
y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
}
else
#endif
{
x_mult = font->x_scale < 0 ? -1 : +1;
y_mult = font->y_scale < 0 ? -1 : +1;
}
if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
return false;
@ -665,13 +693,19 @@ hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
float y_mult;
#ifdef HAVE_FT_GET_TRANSFORM
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
float y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
#else
float y_mult = font->y_scale < 0 ? -1 : +1;
if (ft_font->transform)
{
FT_Matrix matrix;
FT_Get_Transform (ft_face, &matrix, nullptr);
y_mult = sqrtf ((float)matrix.yx * matrix.yx + (float)matrix.yy * matrix.yy) / 65536.f;
}
else
#endif
{
y_mult = font->y_scale < 0 ? -1 : +1;
}
if (ft_face->units_per_EM != 0)
{
@ -1235,13 +1269,14 @@ hb_ft_font_set_funcs (hb_font_t *font)
if (FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL))
FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE);
_hb_ft_hb_font_changed (font, ft_face);
ft_face->generic.data = blob;
ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;
_hb_ft_font_set_funcs (font, ft_face, true);
hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
_hb_ft_hb_font_changed (font, ft_face);
}