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[NTGDI][FREETYPE] Initial support of Surrogate Pairs and emojis (#6851)

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Support emoji characters and minor characters.
JIRA issue: CORE-19030
NOTE: Not every emoji is supported yet (No ZWJ support). Surrogate pairs only.
NOTE: This feature only works if the appropriate font is selected.
- Add IS_HIGH_SURROGATE and
  IS_LOW_SURROGATE macros.
- Add Utf32FromSurrogatePair helper function
  to convert a surrogate pair to a UTF-32 code
  point.
- Convert the surrogate pairs in the text in
  TextIntGetTextExtentPoint, IntGetTextDisposition,
  and IntExtTextOutW functions.
This commit is contained in:
Katayama Hirofumi MZ 2024-05-07 15:24:34 +09:00 committed by GitHub
parent c0e31793c9
commit 5a287473fd
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GPG key ID: B5690EEEBB952194
1 changed files with 58 additions and 7 deletions
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65
win32ss/gdi/ntgdi/freetype.c
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@ -35,6 +35,21 @@
#define NDEBUG
#include <debug.h>
/* The ranges of the surrogate pairs */
#define HIGH_SURROGATE_MIN 0xD800U
#define HIGH_SURROGATE_MAX 0xDBFFU
#define LOW_SURROGATE_MIN 0xDC00U
#define LOW_SURROGATE_MAX 0xDFFFU
#define IS_HIGH_SURROGATE(ch0) (HIGH_SURROGATE_MIN <= (ch0) && (ch0) <= HIGH_SURROGATE_MAX)
#define IS_LOW_SURROGATE(ch1) (LOW_SURROGATE_MIN <= (ch1) && (ch1) <= LOW_SURROGATE_MAX)
static inline DWORD
Utf32FromSurrogatePair(DWORD ch0, DWORD ch1)
{
return ((ch0 - HIGH_SURROGATE_MIN) << 10) + (ch1 - LOW_SURROGATE_MIN) + 0x10000;
}
/* TPMF_FIXED_PITCH is confusing; brain-dead api */
#ifndef _TMPF_VARIABLE_PITCH
#define _TMPF_VARIABLE_PITCH TMPF_FIXED_PITCH
@ -4215,6 +4230,7 @@ TextIntGetTextExtentPoint(PDC dc,
BOOL use_kerning, bVerticalWriting;
LONG ascender, descender;
FONT_CACHE_ENTRY Cache;
DWORD ch0, ch1;
FontGDI = ObjToGDI(TextObj->Font, FONT);
@ -4250,7 +4266,19 @@ TextIntGetTextExtentPoint(PDC dc,
for (i = 0; i < Count; i++)
{
glyph_index = get_glyph_index_flagged(Cache.Hashed.Face, *String, GTEF_INDICES, fl);
ch0 = *String++;
if (IS_HIGH_SURROGATE(ch0))
{
++i;
if (i >= Count)
break;
ch1 = *String++;
if (IS_LOW_SURROGATE(ch1))
ch0 = Utf32FromSurrogatePair(ch0, ch1);
}
glyph_index = get_glyph_index_flagged(Cache.Hashed.Face, ch0, GTEF_INDICES, fl);
Cache.Hashed.GlyphIndex = glyph_index;
realglyph = IntGetRealGlyph(&Cache);
@ -4277,7 +4305,6 @@ TextIntGetTextExtentPoint(PDC dc,
}
previous = glyph_index;
String++;
}
ASSERT(FontGDI->Magic == FONTGDI_MAGIC);
ascender = FontGDI->tmAscent; /* Units above baseline */
@ -5824,12 +5851,25 @@ IntGetTextDisposition(
BOOL use_kerning = FT_HAS_KERNING(face);
ULONG previous = 0;
FT_Vector delta, vec;
DWORD ch0, ch1;
ASSERT_FREETYPE_LOCK_HELD();
for (i = 0; i < Count; ++i)
{
glyph_index = get_glyph_index_flagged(face, *String++, ETO_GLYPH_INDEX, fuOptions);
ch0 = *String++;
if (IS_HIGH_SURROGATE(ch0))
{
++i;
if (i >= Count)
return TRUE;
ch1 = *String++;
if (IS_LOW_SURROGATE(ch1))
ch0 = Utf32FromSurrogatePair(ch0, ch1);
}
glyph_index = get_glyph_index_flagged(face, ch0, ETO_GLYPH_INDEX, fuOptions);
Cache->Hashed.GlyphIndex = glyph_index;
realglyph = IntGetRealGlyph(Cache);
@ -6000,6 +6040,7 @@ IntExtTextOutW(
FONT_CACHE_ENTRY Cache;
FT_Matrix mat;
BOOL bNoTransform;
DWORD ch0, ch1;
/* Check if String is valid */
if (Count > 0xFFFF || (Count > 0 && String == NULL))
@ -6212,9 +6253,6 @@ IntExtTextOutW(
EXLATEOBJ_vInitialize(&exloRGB2Dst, &gpalRGB, psurf->ppal, 0, 0, 0);
EXLATEOBJ_vInitialize(&exloDst2RGB, psurf->ppal, &gpalRGB, 0, 0, 0);
/* Assume success */
bResult = TRUE;
if (pdcattr->ulDirty_ & DIRTY_TEXT)
DC_vUpdateTextBrush(dc);
@ -6225,9 +6263,22 @@ IntExtTextOutW(
Y64 = RealYStart64;
previous = 0;
DoBreak = FALSE;
bResult = TRUE; /* Assume success */
for (i = 0; i < Count; ++i)
{
glyph_index = get_glyph_index_flagged(face, *String++, ETO_GLYPH_INDEX, fuOptions);
ch0 = *String++;
if (IS_HIGH_SURROGATE(ch0))
{
++i;
if (i >= Count)
break;
ch1 = *String++;
if (IS_LOW_SURROGATE(ch1))
ch0 = Utf32FromSurrogatePair(ch0, ch1);
}
glyph_index = get_glyph_index_flagged(face, ch0, ETO_GLYPH_INDEX, fuOptions);
Cache.Hashed.GlyphIndex = glyph_index;
realglyph = IntGetRealGlyph(&Cache);