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dwrite: Improve line breaking logic. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2017-01-31 14:43:11 +03:00 committed by Alexandre Julliard
parent 76c31950fe
commit b280c3bf2e
1 changed files with 67 additions and 36 deletions
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97
dlls/dwrite/analyzer.c
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@ -363,20 +363,31 @@ enum linebreaking_classes {
b_ZWJ,
};
static BOOL has_strong_condition(DWRITE_BREAK_CONDITION old_condition, DWRITE_BREAK_CONDITION new_condition)
{
if (old_condition == DWRITE_BREAK_CONDITION_MAY_NOT_BREAK || old_condition == DWRITE_BREAK_CONDITION_MUST_BREAK)
return TRUE;
if (old_condition == DWRITE_BREAK_CONDITION_CAN_BREAK && new_condition != DWRITE_BREAK_CONDITION_MUST_BREAK)
return TRUE;
return FALSE;
}
/* "Can break" is a weak condition, stronger "may not break" and "must break" override it. Initially all conditions are
set to "can break" and could only be changed once. */
static inline void set_break_condition(UINT32 pos, enum BreakConditionLocation location, DWRITE_BREAK_CONDITION condition,
struct linebreaking_state *state)
{
if (location == BreakConditionBefore) {
if (state->breakpoints[pos].breakConditionBefore != DWRITE_BREAK_CONDITION_CAN_BREAK)
if (has_strong_condition(state->breakpoints[pos].breakConditionBefore, condition))
return;
state->breakpoints[pos].breakConditionBefore = condition;
if (pos > 0)
state->breakpoints[pos-1].breakConditionAfter = condition;
}
else {
if (state->breakpoints[pos].breakConditionAfter != DWRITE_BREAK_CONDITION_CAN_BREAK)
if (has_strong_condition(state->breakpoints[pos].breakConditionAfter, condition))
return;
state->breakpoints[pos].breakConditionAfter = condition;
if (pos + 1 < state->count)
@ -403,14 +414,12 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
state.breakpoints = breakpoints;
state.count = count;
/* LB31 - allow breaks everywhere. It will be overridden if needed as
other rules dictate. */
for (i = 0; i < count; i++)
{
break_class[i] = get_table_entry(wine_linebreak_table, text[i]);
breakpoints[i].breakConditionBefore = DWRITE_BREAK_CONDITION_CAN_BREAK;
breakpoints[i].breakConditionAfter = DWRITE_BREAK_CONDITION_CAN_BREAK;
breakpoints[i].breakConditionBefore = DWRITE_BREAK_CONDITION_NEUTRAL;
breakpoints[i].breakConditionAfter = DWRITE_BREAK_CONDITION_NEUTRAL;
breakpoints[i].isWhitespace = !!isspaceW(text[i]);
breakpoints[i].isSoftHyphen = text[i] == 0x00ad /* Unicode Soft Hyphen */;
breakpoints[i].padding = 0;
@ -432,8 +441,10 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
/* LB2 - never break at the start */
set_break_condition(0, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
/* LB3 - always break at the end. This one is ignored. */
/* LB3 - always break at the end. */
set_break_condition(count - 1, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
/* LB4 - LB6 - mandatory breaks. */
for (i = 0; i < count; i++)
{
switch (break_class[i])
@ -455,16 +466,27 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
/* LB6 - do not break before hard breaks */
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
}
}
/* LB7 - LB8 - explicit breaks and non-breaks */
for (i = 0; i < count; i++)
{
switch (break_class[i])
{
/* LB7 - do not break before spaces */
case b_SP:
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
case b_ZW:
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
/* LB8 - break before character after zero-width space, skip spaces in-between */
while (i < count-1 && break_class[i+1] == b_SP)
i++;
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
j = i;
while (j < count-1 && break_class[j+1] == b_SP)
j++;
if (j < count-1 && break_class[j+1] != b_ZW)
set_break_condition(j, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
break;
/* LB8a - do not break between ZWJ and an ideograph, emoji base or emoji modifier */
case b_ZWJ:
@ -474,7 +496,7 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
}
}
/* LB9 - LB10 */
/* LB9 - LB10 - combining marks */
for (i = 0; i < count; i++)
{
if (break_class[i] == b_CM || break_class[i] == b_ZWJ)
@ -492,7 +514,10 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
break_class[i] = b_AL;
break;
default:
{
break_class[i] = break_class[i-1];
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
}
}
}
else break_class[i] = b_AL;
@ -526,22 +551,20 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
case b_SY:
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
/* LB14 */
/* LB14 - do not break after OP, even after spaces */
case b_OP:
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
while (i < count-1 && break_class[i+1] == b_SP) {
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
i++;
}
break;
/* LB15 */
case b_QU:
j = i+1;
while (j < count-1 && break_class[j] == b_SP)
j = i;
while (j < count-1 && break_class[j+1] == b_SP)
j++;
if (break_class[j] == b_OP)
for (; j > i; j--)
set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
set_break_condition(j, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
/* LB15 - do not break within QU-OP, even with intervening spaces */
case b_QU:
j = i;
while (j < count-1 && break_class[j+1] == b_SP)
j++;
if (j < count - 1 && break_class[j+1] == b_OP)
set_break_condition(j, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
/* LB16 */
case b_NS:
@ -552,14 +575,13 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
for (j++; j <= i; j++)
set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
/* LB17 */
/* LB17 - do not break within B2, even with intervening spaces */
case b_B2:
j = i+1;
while (j < count && break_class[j] == b_SP)
j = i;
while (j < count && break_class[j+1] == b_SP)
j++;
if (break_class[j] == b_B2)
for (; j > i; j--)
set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
if (j < count - 1 && break_class[j+1] == b_B2)
set_break_condition(j, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
}
}
@ -580,6 +602,7 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
/* LB20 */
case b_CB:
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
if (i < count - 1 && break_class[i+1] != b_QU)
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
break;
/* LB21 */
@ -589,6 +612,7 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
case b_BB:
if (i < count - 1 && break_class[i+1] != b_CB)
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
break;
/* LB21a, LB21b */
@ -701,7 +725,7 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
if (break_class[i+1] == b_IN || break_class[i+1] == b_PO)
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
}
if (break_class[i] == b_PO)
if (break_class[i] == b_PR)
{
switch (break_class[i+1])
{
@ -731,7 +755,7 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
break_class[i+1] == b_OP)
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
if (break_class[i] == b_CP &&
(break_class[i+1] == b_AL || break_class[i] == b_HL || break_class[i] == b_NU))
(break_class[i+1] == b_AL || break_class[i+1] == b_HL || break_class[i+1] == b_NU))
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
/* LB30a - break between two RIs if and only if there are an even number of RIs preceding position of the break */
@ -752,6 +776,13 @@ static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_B
}
}
/* LB31 - allow breaks everywhere else. */
for (i = 0; i < count; i++)
{
set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
}
heap_free(break_class);
return S_OK;
}