Formatting, minor doc improvements.
This commit is contained in:
Werner Lemberg
parent
084abf0469
commit
27b20e9a1e
@ -16,10 +16,9 @@ CHANGES BETWEEN 2.4.4 and 2.4.5
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redundant and is simply ignored; this means that FreeType now
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ignores the global advance width value in TrueType fonts.
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- Just Fill Bugs contributed an experimental code to compute blue
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zones for CJK Ideographs, to improve the alignment of horizontal
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stems at the top or bottom edges. Mainly tested with a TrueType
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WenQuanYi-ZenHei.
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- Just Fill Bugs contributed (experimental) code to compute blue
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zones for CJK Ideographs, improving the alignment of horizontal
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stems at the top or bottom edges.
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III. MISCELLANEOUS
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@ -62,7 +62,8 @@
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/*************************************************************************/
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/* Basically the Latin version with AF_CJKMetrics to replace AF_LatinMetrics */
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/* Basically the Latin version with AF_CJKMetrics */
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/* to replace AF_LatinMetrics. */
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FT_LOCAL_DEF( void )
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af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
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@ -79,11 +80,11 @@
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metrics->axis[AF_DIMENSION_VERT].width_count = 0;
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{
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FT_Error error;
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FT_UInt glyph_index;
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int dim;
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AF_CJKMetricsRec dummy[1];
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AF_Scaler scaler = &dummy->root.scaler;
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FT_Error error;
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FT_UInt glyph_index;
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int dim;
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AF_CJKMetricsRec dummy[1];
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AF_Scaler scaler = &dummy->root.scaler;
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glyph_index = FT_Get_Char_Index( face, charcode );
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@ -121,13 +122,11 @@
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FT_UInt num_widths = 0;
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error = af_latin_hints_compute_segments( hints,
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(AF_Dimension)dim );
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error = af_latin_hints_compute_segments( hints, (AF_Dimension)dim );
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if ( error )
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goto Exit;
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af_latin_hints_link_segments( hints,
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(AF_Dimension)dim );
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af_latin_hints_link_segments( hints, (AF_Dimension)dim );
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seg = axhints->segments;
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limit = seg + axhints->num_segments;
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@ -155,16 +154,15 @@
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axis->width_count = num_widths;
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}
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Exit:
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Exit:
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for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
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{
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AF_CJKAxis axis = &metrics->axis[dim];
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FT_Pos stdw;
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AF_CJKAxis axis = &metrics->axis[dim];
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FT_Pos stdw;
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stdw = ( axis->width_count > 0 )
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? axis->widths[0].org
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: AF_LATIN_CONSTANT( metrics, 50 );
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stdw = ( axis->width_count > 0 ) ? axis->widths[0].org
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: AF_LATIN_CONSTANT( metrics, 50 );
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/* let's try 20% of the smallest width */
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axis->edge_distance_threshold = stdw / 5;
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@ -177,13 +175,12 @@
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}
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#define AF_CJK_MAX_TEST_CHARACTERS 32
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/* Every blue zone has 2 types of fill and unfill,
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* Which means fill the entire square or not.
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* */
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/* Each blue zone has two types of fill and unfill, this is, */
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/* filling the entire glyph square or not. */
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enum
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{
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AF_CJK_BLUE_TYPE_FILL,
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@ -191,6 +188,7 @@
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AF_CJK_BLUE_TYPE_MAX
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};
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/* Put some common and representative Han Ideographs characters here. */
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static const FT_ULong af_cjk_hani_blue_chars[AF_CJK_BLUE_MAX]
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[AF_CJK_BLUE_TYPE_MAX]
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@ -260,28 +258,32 @@
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};
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/* Calculate blue zones for all the CJK_BLUE_XXX's */
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/* Calculate blue zones for all the CJK_BLUE_XXX's. */
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static void
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af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
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FT_Face face,
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const FT_ULong blue_chars[AF_CJK_BLUE_MAX]
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[AF_CJK_BLUE_TYPE_MAX]
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[AF_CJK_MAX_TEST_CHARACTERS] )
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const FT_ULong blue_chars
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[AF_CJK_BLUE_MAX]
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[AF_CJK_BLUE_TYPE_MAX]
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[AF_CJK_MAX_TEST_CHARACTERS] )
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{
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FT_Pos fills[AF_CJK_MAX_TEST_CHARACTERS];
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FT_Pos flats[AF_CJK_MAX_TEST_CHARACTERS];
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FT_Int num_fills;
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FT_Int num_flats;
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FT_Int bb;
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AF_CJKBlue blue;
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FT_Error error;
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AF_CJKAxis axis;
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FT_GlyphSlot glyph = face->glyph;
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/* we compute the blues simply by loading each character from the */
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/* 'blue_chars[blues]' string, then compute its extreme */
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/* points (depending blue zone type etc.) */
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/* We compute the blues simply by loading each character from the */
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/* `blue_chars[blues]' string, then computing its extreme points */
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/* (depending blue zone type etc.). */
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FT_TRACE5(( "cjk blue zones computation\n" ));
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FT_TRACE5(( "------------------------------------------------\n" ));
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@ -293,13 +295,15 @@
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FT_Pos* blue_shoot;
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num_fills = 0;
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num_flats = 0;
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for ( fill_type = 0 ; fill_type < AF_CJK_BLUE_TYPE_MAX; fill_type++)
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num_fills = 0;
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num_flats = 0;
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for ( fill_type = 0; fill_type < AF_CJK_BLUE_TYPE_MAX; fill_type++ )
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{
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const FT_ULong* p = blue_chars[bb][fill_type];
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const FT_ULong* limit = p + AF_CJK_MAX_TEST_CHARACTERS;
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FT_Bool fill = FT_BOOL( fill_type == AF_CJK_BLUE_TYPE_FILL );
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FT_Bool fill = FT_BOOL(
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fill_type == AF_CJK_BLUE_TYPE_FILL );
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FT_TRACE5(( "cjk blue %3d/%d: ", bb, fill_type ));
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@ -312,6 +316,7 @@
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FT_Int best_point, best_first, best_last;
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FT_Vector* points;
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FT_TRACE5(( "0x%lX", *p ));
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/* load the character in the face -- skip unknown or empty ones */
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@ -336,7 +341,9 @@
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FT_Int last = -1;
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for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
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for ( nn = 0;
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nn < glyph->outline.n_contours;
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first = last + 1, nn++ )
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{
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FT_Int old_best_point = best_point;
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FT_Int pp;
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@ -344,49 +351,54 @@
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last = glyph->outline.contours[nn];
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/* Avoid single-point contours since they are never rasterized. */
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/* In some fonts, they correspond to mark attachment points */
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/* which are way outside of the glyph's real outline. */
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/* Avoid single-point contours since they are never */
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/* rasterized. In some fonts, they correspond to mark */
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/* attachment points which are way outside of the glyph's */
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/* real outline. */
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if ( last <= first )
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continue;
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switch (bb)
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switch ( bb )
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{
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case AF_CJK_BLUE_TOP:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].y > best_pos )
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{
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best_point = pp;
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best_pos = points[pp].y;
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}
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break;
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case AF_CJK_BLUE_BOTTOM:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].y < best_pos )
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{
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best_point = pp;
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best_pos = points[pp].y;
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}
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break;
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case AF_CJK_BLUE_LEFT:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].x < best_pos )
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{
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best_point = pp;
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best_pos = points[pp].x;
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}
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break;
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case AF_CJK_BLUE_RIGHT:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].x > best_pos )
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{
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best_point = pp;
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best_pos = points[pp].x;
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}
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break;
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default:
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;
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}
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case AF_CJK_BLUE_TOP:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].y > best_pos )
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{
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best_point = pp;
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best_pos = points[pp].y;
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}
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break;
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case AF_CJK_BLUE_BOTTOM:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].y < best_pos )
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{
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best_point = pp;
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best_pos = points[pp].y;
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}
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break;
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case AF_CJK_BLUE_LEFT:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].x < best_pos )
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{
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best_point = pp;
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best_pos = points[pp].x;
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}
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break;
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case AF_CJK_BLUE_RIGHT:
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for ( pp = first; pp <= last; pp++ )
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if ( best_point < 0 || points[pp].x > best_pos )
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{
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best_point = pp;
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best_pos = points[pp].x;
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}
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break;
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default:
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;
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}
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if ( best_point != old_best_point )
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{
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@ -397,7 +409,7 @@
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FT_TRACE5(( "%5ld, ", best_pos ));
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}
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if (fill)
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if ( fill )
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fills[num_fills++] = best_pos;
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else
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flats[num_flats++] = best_pos;
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@ -406,7 +418,7 @@
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FT_TRACE5(( "\n" ));
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}
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if ( num_flats == 0 && num_fills == 0)
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if ( num_flats == 0 && num_fills == 0 )
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{
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/*
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* we couldn't find a single glyph to compute this blue zone,
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@ -417,8 +429,8 @@
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}
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/* we have computed the contents of the `fill' and `flats' tables, */
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/* now determine the reference position of the blue -- */
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/* we simply take the median value after a simple sort */
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/* now determine the reference position of the blue -- */
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/* we simply take the median value after a simple sort */
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af_sort_pos( num_flats, flats );
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af_sort_pos( num_fills, fills );
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@ -448,8 +460,8 @@
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*blue_shoot = flats[num_flats / 2];
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}
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/* make sure blue_ref >= blue_shoot for top/right or
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* vis vesa for bottom/left. */
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/* make sure blue_ref >= blue_shoot for top/right or */
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/* vice versa for bottom/left */
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if ( *blue_shoot != *blue_ref )
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{
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FT_Pos ref = *blue_ref;
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@ -467,8 +479,10 @@
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else if ( AF_CJK_BLUE_RIGHT == bb )
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blue->flags |= AF_CJK_BLUE_IS_RIGHT;
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FT_TRACE5(( "-- cjk ref = %ld shoot = %ld\n", *blue_ref, *blue_shoot ));
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FT_TRACE5(( "-- cjk ref = %ld shoot = %ld\n",
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*blue_ref, *blue_shoot ));
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}
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return;
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}
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@ -580,8 +594,8 @@
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/* scale the blue zones */
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for ( nn = 0; nn < axis->blue_count; nn++ )
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{
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AF_CJKBlue blue = &axis->blues[nn];
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FT_Pos dist;
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AF_CJKBlue blue = &axis->blues[nn];
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FT_Pos dist;
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blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
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@ -596,10 +610,11 @@
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{
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FT_Pos delta1, delta2;
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blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
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blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
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/* shoot is under shoot for cjk */
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delta1 = FT_DivFix(blue->ref.fit, scale) - blue->shoot.org;
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delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org;
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delta2 = delta1;
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if ( delta1 < 0 )
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delta2 = -delta2;
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@ -609,10 +624,10 @@
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FT_TRACE5(( "delta: %d", delta1 ));
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if ( delta2 < 32 )
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delta2 = 0;
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/*
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#if 0
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else if ( delta2 < 64 )
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delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
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*/
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#endif
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else
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delta2 = FT_PIX_ROUND( delta2 );
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FT_TRACE5(( "/%d\n", delta2 ));
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@ -624,10 +639,10 @@
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FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]: "
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"ref: cur=%.2f fit=%.2f shoot: cur=%.2f fit=%.2f\n",
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( dim == AF_DIMENSION_HORZ ) ? 'H':'V',
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( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V',
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nn, blue->ref.org, blue->shoot.org,
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blue->ref.cur/64.0, blue->ref.fit/64.0,
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blue->shoot.cur/64.0, blue->shoot.fit/64.0 ));
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blue->ref.cur / 64.0, blue->ref.fit / 64.0,
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blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
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blue->flags |= AF_CJK_BLUE_ACTIVE;
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}
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@ -1143,14 +1158,14 @@
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FT_LOCAL_DEF( void )
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af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
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AF_CJKMetrics metrics,
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AF_Dimension dim )
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af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
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AF_CJKMetrics metrics,
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AF_Dimension dim )
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{
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AF_AxisHints axis = &hints->axis[ dim ];
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AF_AxisHints axis = &hints->axis[dim];
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AF_Edge edge = axis->edges;
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AF_Edge edge_limit = edge + axis->num_edges;
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AF_CJKAxis cjk = &metrics->axis[ dim ];
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AF_CJKAxis cjk = &metrics->axis[dim];
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FT_Fixed scale = cjk->scale;
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FT_Pos best_dist0; /* initial threshold */
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@ -1158,15 +1173,16 @@
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/* compute the initial threshold as a fraction of the EM size */
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best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
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if ( best_dist0 > 64 / 2 ) /* Maximum 1/2 pixel */
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if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */
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best_dist0 = 64 / 2;
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/* compute which blue zones are active, i.e. have their scaled */
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/* size < 3/4 pixels */
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/* If the distant between an edge and a blue zone is shorter than
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* best_dist0, set the blue zone for the edge. Then search for
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* the blue zone with the smallest best_dist to the edge. */
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/* If the distant between an edge and a blue zone is shorter than */
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/* best_dist0, set the blue zone for the edge. Then search for */
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/* the blue zone with the smallest best_dist to the edge. */
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for ( ; edge < edge_limit; edge++ )
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{
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FT_UInt bb;
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@ -1176,8 +1192,9 @@
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for ( bb = 0; bb < cjk->blue_count; bb++ )
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{
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AF_CJKBlue blue = cjk->blues + bb;
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FT_Bool is_top_right_blue, is_major_dir;
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AF_CJKBlue blue = cjk->blues + bb;
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FT_Bool is_top_right_blue, is_major_dir;
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/* skip inactive blue zones (i.e., those that are too small) */
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if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
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@ -1187,8 +1204,9 @@
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/* zone, check for left edges */
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/* */
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/* of course, that's for TrueType */
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is_top_right_blue = FT_BOOL( ( ( blue->flags & AF_CJK_BLUE_IS_TOP ) != 0 ) ||
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( ( blue->flags & AF_CJK_BLUE_IS_RIGHT ) != 0 ) );
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is_top_right_blue =
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FT_BOOL( ( ( blue->flags & AF_CJK_BLUE_IS_TOP ) != 0 ) ||
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( ( blue->flags & AF_CJK_BLUE_IS_RIGHT ) != 0 ) );
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is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
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/* if it is a top zone, the edge must be against the major */
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@ -1208,7 +1226,7 @@
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compare = &blue->ref;
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dist = edge->fpos - compare->org;
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if (dist < 0)
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if ( dist < 0 )
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dist = -dist;
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dist = FT_MulFix( dist, scale );
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@ -1227,8 +1245,8 @@
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FT_LOCAL_DEF( FT_Error )
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af_cjk_hints_init( AF_GlyphHints hints,
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AF_CJKMetrics metrics )
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af_cjk_hints_init( AF_GlyphHints hints,
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AF_CJKMetrics metrics )
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{
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FT_Render_Mode mode;
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FT_UInt32 scaler_flags, other_flags;
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||||
@ -1353,11 +1371,11 @@
|
||||
AF_Edge_Flags base_flags,
|
||||
AF_Edge_Flags stem_flags )
|
||||
{
|
||||
AF_CJKMetrics metrics = (AF_CJKMetrics) hints->metrics;
|
||||
AF_CJKAxis axis = & metrics->axis[dim];
|
||||
FT_Pos dist = width;
|
||||
FT_Int sign = 0;
|
||||
FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
|
||||
AF_CJKMetrics metrics = (AF_CJKMetrics) hints->metrics;
|
||||
AF_CJKAxis axis = & metrics->axis[dim];
|
||||
FT_Pos dist = width;
|
||||
FT_Int sign = 0;
|
||||
FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
|
||||
|
||||
FT_UNUSED( base_flags );
|
||||
FT_UNUSED( stem_flags );
|
||||
@ -2073,9 +2091,9 @@
|
||||
|
||||
|
||||
FT_LOCAL_DEF( FT_Error )
|
||||
af_cjk_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics )
|
||||
af_cjk_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics )
|
||||
{
|
||||
FT_Error error;
|
||||
int dim;
|
||||
|
||||
@ -4,7 +4,7 @@
|
||||
/* */
|
||||
/* Auto-fitter hinting routines for CJK script (specification). */
|
||||
/* */
|
||||
/* Copyright 2006, 2007 by */
|
||||
/* Copyright 2006, 2007, 2011 by */
|
||||
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
|
||||
/* */
|
||||
/* This file is part of the FreeType project, and may only be used, */
|
||||
@ -33,9 +33,9 @@ FT_BEGIN_HEADER
|
||||
/* CJK (global) metrics management */
|
||||
|
||||
/*
|
||||
* CJK glyphs tend to fill the square. So we have both verticle and
|
||||
* horizontal blue zones. But some glyphs have flat bounding stroke that
|
||||
* leave some space between neighbour glyphs.
|
||||
* CJK glyphs tend to fill the square. So we have both vertical and
|
||||
* horizontal blue zones. But some glyphs have flat bounding strokes that
|
||||
* leave some space between neighbour glyphs.
|
||||
*/
|
||||
enum
|
||||
{
|
||||
@ -58,10 +58,11 @@ FT_BEGIN_HEADER
|
||||
AF_CJK_BLUE_IS_TOP = 1 << 1,
|
||||
AF_CJK_BLUE_IS_RIGHT = 1 << 2,
|
||||
AF_CJK_BLUE_ADJUSTMENT = 1 << 3, /* used for scale adjustment */
|
||||
/* optimization */
|
||||
/* optimization */
|
||||
AF_CJK_BLUE_FLAG_MAX
|
||||
};
|
||||
|
||||
|
||||
typedef struct AF_CJKBlueRec_
|
||||
{
|
||||
AF_WidthRec ref;
|
||||
@ -70,24 +71,25 @@ FT_BEGIN_HEADER
|
||||
|
||||
} AF_CJKBlueRec, *AF_CJKBlue;
|
||||
|
||||
|
||||
typedef struct AF_CJKAxisRec_
|
||||
{
|
||||
FT_Fixed scale;
|
||||
FT_Pos delta;
|
||||
FT_Fixed scale;
|
||||
FT_Pos delta;
|
||||
|
||||
FT_UInt width_count;
|
||||
AF_WidthRec widths[AF_CJK_MAX_WIDTHS];
|
||||
FT_Pos edge_distance_threshold;
|
||||
FT_Pos standard_width;
|
||||
FT_Bool extra_light;
|
||||
FT_UInt width_count;
|
||||
AF_WidthRec widths[AF_CJK_MAX_WIDTHS];
|
||||
FT_Pos edge_distance_threshold;
|
||||
FT_Pos standard_width;
|
||||
FT_Bool extra_light;
|
||||
|
||||
/* used for horizontal metrics too for CJK */
|
||||
FT_Bool control_overshoot;
|
||||
FT_UInt blue_count;
|
||||
AF_CJKBlueRec blues[AF_CJK_BLUE_MAX];
|
||||
FT_Bool control_overshoot;
|
||||
FT_UInt blue_count;
|
||||
AF_CJKBlueRec blues[AF_CJK_BLUE_MAX];
|
||||
|
||||
FT_Fixed org_scale;
|
||||
FT_Pos org_delta;
|
||||
FT_Fixed org_scale;
|
||||
FT_Pos org_delta;
|
||||
|
||||
} AF_CJKAxisRec, *AF_CJKAxis;
|
||||
|
||||
@ -100,22 +102,23 @@ FT_BEGIN_HEADER
|
||||
|
||||
} AF_CJKMetricsRec, *AF_CJKMetrics;
|
||||
|
||||
|
||||
FT_LOCAL( FT_Error )
|
||||
af_cjk_metrics_init( AF_CJKMetrics metrics,
|
||||
FT_Face face );
|
||||
af_cjk_metrics_init( AF_CJKMetrics metrics,
|
||||
FT_Face face );
|
||||
|
||||
FT_LOCAL( void )
|
||||
af_cjk_metrics_scale( AF_CJKMetrics metrics,
|
||||
AF_Scaler scaler );
|
||||
af_cjk_metrics_scale( AF_CJKMetrics metrics,
|
||||
AF_Scaler scaler );
|
||||
|
||||
FT_LOCAL( FT_Error )
|
||||
af_cjk_hints_init( AF_GlyphHints hints,
|
||||
AF_CJKMetrics metrics );
|
||||
af_cjk_hints_init( AF_GlyphHints hints,
|
||||
AF_CJKMetrics metrics );
|
||||
|
||||
FT_LOCAL( FT_Error )
|
||||
af_cjk_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics );
|
||||
af_cjk_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics );
|
||||
|
||||
/* Shared. called from afindic.c */
|
||||
FT_LOCAL( void )
|
||||
|
||||
@ -33,8 +33,8 @@
|
||||
|
||||
|
||||
static FT_Error
|
||||
af_indic_metrics_init( AF_CJKMetrics metrics,
|
||||
FT_Face face )
|
||||
af_indic_metrics_init( AF_CJKMetrics metrics,
|
||||
FT_Face face )
|
||||
{
|
||||
/* skip blue zone init in CJK routines */
|
||||
FT_CharMap oldmap = face->charmap;
|
||||
@ -48,7 +48,7 @@
|
||||
{
|
||||
af_cjk_metrics_init_widths( metrics, face, 0x7530 );
|
||||
#if 0
|
||||
/* either need indic specific blue_chars[] or just skip blue zones. */
|
||||
/* either need indic specific blue_chars[] or just skip blue zones */
|
||||
af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars );
|
||||
#endif
|
||||
af_cjk_metrics_check_digits( metrics, face );
|
||||
@ -61,8 +61,8 @@
|
||||
|
||||
|
||||
static void
|
||||
af_indic_metrics_scale( AF_CJKMetrics metrics,
|
||||
AF_Scaler scaler )
|
||||
af_indic_metrics_scale( AF_CJKMetrics metrics,
|
||||
AF_Scaler scaler )
|
||||
{
|
||||
/* use CJK routines */
|
||||
af_cjk_metrics_scale( metrics, scaler );
|
||||
@ -70,8 +70,8 @@
|
||||
|
||||
|
||||
static FT_Error
|
||||
af_indic_hints_init( AF_GlyphHints hints,
|
||||
AF_CJKMetrics metrics )
|
||||
af_indic_hints_init( AF_GlyphHints hints,
|
||||
AF_CJKMetrics metrics )
|
||||
{
|
||||
/* use CJK routines */
|
||||
return af_cjk_hints_init( hints, metrics );
|
||||
@ -79,9 +79,9 @@
|
||||
|
||||
|
||||
static FT_Error
|
||||
af_indic_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics)
|
||||
af_indic_hints_apply( AF_GlyphHints hints,
|
||||
FT_Outline* outline,
|
||||
AF_CJKMetrics metrics )
|
||||
{
|
||||
/* use CJK routines */
|
||||
return af_cjk_hints_apply( hints, outline, metrics );
|
||||
|
||||
Loading…
Reference in New Issue
Block a user