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Tune the TextRunsInfo and LayoutInfo related APIs

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This commit is contained in:
Vincent Wei
2019-03-28 17:47:12 +08:00
parent 86965a0e9c
commit 1c79cf510f
12 changed files with 645 additions and 346 deletions
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src/font/unicode-script.c
+41 -35
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@@ -386,21 +386,27 @@ ScriptType GUIAPI NormalizeScriptType(LanguageCode cl,
return ws;
}
typedef enum {
HORIZONTAL_DIRECTION_LTR,
HORIZONTAL_DIRECTION_RTL,
HORIZONTAL_DIRECTION_WEAK,
} HorizontalDirection;
typedef enum {
VERTICAL_DIRECTION_NONE,
VERTICAL_DIRECTION_TTB,
VERTICAL_DIRECTION_BTT
VERTICAL_DIRECTION_BTT,
} VerticalDirection;
typedef struct {
/* GlyphRunDir */
Uint8 horiz_dir; /* Orientation in horizontal context */
/* PangoVerticalDirection */
/* VerticalDirection */
Uint8 vert_dir; /* Orientation in vertical context */
/* GlyphOrient */
Uint8 preferred_orient; /* Preferred context orientation */
/* LayoutGravity */
Uint8 preferred_gravity; /* Preferred context gravity */
/* BOOL */
Uint8 wide; /* Whether script is mostly wide.
@@ -412,13 +418,13 @@ typedef struct {
#define TTB VERTICAL_DIRECTION_TTB
#define BTT VERTICAL_DIRECTION_BTT
#define LTR GLYPH_RUN_DIR_LTR
#define RTL GLYPH_RUN_DIR_RTL
#define WEAK GLYPH_RUN_DIR_WEAK_LTR
#define LTR HORIZONTAL_DIRECTION_LTR
#define RTL HORIZONTAL_DIRECTION_RTL
#define WEAK HORIZONTAL_DIRECTION_WEAK
#define S GLYPH_ORIENT_UPRIGHT
#define E GLYPH_ORIENT_SIDEWAYS
#define W GLYPH_ORIENT_SIDEWAYS_LEFT
#define S LAYOUT_GRAVITY_SOUTH
#define E LAYOUT_GRAVITY_EAST
#define W LAYOUT_GRAVITY_WEST
#define UNKNOWN_SCRIPT_PROPERTY \
{LTR, NONE, S, FALSE}
@@ -627,61 +633,61 @@ static inline ScriptTypeProperties get_script_properties (ScriptType script)
return script_properties[script];
}
GlyphOrient ScriptGetGlyphOrientation (ScriptType script,
GlyphOrient base_orient, GlyphOrientPolicy hint)
LayoutGravity ScriptGetLayoutGravity (ScriptType script,
LayoutGravity base_gravity, LayoutGravityPolicy hint)
{
ScriptTypeProperties props = get_script_properties (script);
if (base_orient == GLYPH_ORIENT_AUTO)
base_orient = props.preferred_orient;
if (base_gravity == LAYOUT_GRAVITY_AUTO)
base_gravity = props.preferred_gravity;
return GetWideGlyphOrientationForScript (script, props.wide,
base_orient, hint);
return ScriptGetLayoutGravityForWide (script, props.wide,
base_gravity, hint);
}
GlyphOrient GetWideGlyphOrientationForScript (ScriptType script,
BOOL wide, GlyphOrient base_orient, GlyphOrientPolicy hint)
LayoutGravity ScriptGetLayoutGravityForWide (ScriptType script,
BOOL wide, LayoutGravity base_gravity, LayoutGravityPolicy hint)
{
ScriptTypeProperties props = get_script_properties (script);
BOOL vertical;
if (base_orient == GLYPH_ORIENT_AUTO)
base_orient = props.preferred_orient;
if (base_gravity == LAYOUT_GRAVITY_AUTO)
base_gravity = props.preferred_gravity;
vertical = GLYPH_ORIENT_IS_VERTICAL(base_orient);
vertical = LAYOUT_GRAVITY_IS_VERTICAL(base_gravity);
/* Everything is designed such that a system with no vertical support
* renders everything correctly horizontally. So, if not in a vertical
* orientation, base and resolved gravities are always the same.
* gravity, base and resolved gravities are always the same.
*
* Wide characters are always upright.
*/
if (!vertical || wide)
return base_orient;
return base_gravity;
/* If here, we have a narrow character in a vertical orientation setting.
/* If here, we have a narrow character in a vertical gravity setting.
* Resolve depending on the hint.
*/
switch (hint) {
default:
case GLYPH_ORIENT_POLICY_NATURAL:
case LAYOUT_GRAVITY_POLICY_NATURAL:
if (props.vert_dir == VERTICAL_DIRECTION_NONE)
return GLYPH_ORIENT_UPRIGHT;
if ((base_orient == GLYPH_ORIENT_SIDEWAYS) ^
return LAYOUT_GRAVITY_SOUTH;
if ((base_gravity == LAYOUT_GRAVITY_EAST) ^
(props.vert_dir == VERTICAL_DIRECTION_BTT))
return GLYPH_ORIENT_UPRIGHT;
return LAYOUT_GRAVITY_SOUTH;
else
return GLYPH_ORIENT_UPSIDE_DOWN;
return LAYOUT_GRAVITY_NORTH;
case GLYPH_ORIENT_POLICY_STRONG:
return base_orient;
case LAYOUT_GRAVITY_POLICY_STRONG:
return base_gravity;
case GLYPH_ORIENT_POLICY_LINE:
if ((base_orient == GLYPH_ORIENT_SIDEWAYS) ^
case LAYOUT_GRAVITY_POLICY_LINE:
if ((base_gravity == LAYOUT_GRAVITY_EAST) ^
(props.horiz_dir == GLYPH_RUN_DIR_RTL))
return GLYPH_ORIENT_UPRIGHT;
return LAYOUT_GRAVITY_SOUTH;
else
return GLYPH_ORIENT_UPSIDE_DOWN;
return LAYOUT_GRAVITY_NORTH;
}
}
#endif /* _MGCHARSET_UNICODE */