366 lines
13 KiB
C
366 lines
13 KiB
C
#include "afadjust.h"
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#include <freetype/freetype.h>
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftmemory.h>
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#include <freetype/internal/ftdebug.h>
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#define AF_ADJUSTMENT_DATABASE_LENGTH ( sizeof(adjustment_database)/sizeof(adjustment_database[0]) )
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#undef FT_COMPONENT
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#define FT_COMPONENT afadjust
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/*
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All entries in this list must be sorted by unicode codepoint ascending
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The table entries are 3 numbers consisting of:
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- unicode codepoint. THESE MUST BE LISTED IN ASCENDING ORDER
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- the vertical adjustment type. This should be one of the enum constants in AF_VerticalSeparationAdjustmentType
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- 1 if the topmost contour is a tilde and should be prevented from flattening.
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*/
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FT_LOCAL_ARRAY_DEF( AF_AdjustmentDatabaseEntry )
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adjustment_database[] =
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{
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{0x21, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /* ! */
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{0x69, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /* i */
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{0x6A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /* j */
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{0xA1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*Inverted Exclamation Mark*/
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{0xBF, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /* j */
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{0xA1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*Inverted Exclamation Mark*/
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{0xBF, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*Inverted Question Mark*/
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{0xC0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*A with grave*/
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{0xC1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*A with acute*/
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{0xC2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*A with circumflex*/
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{0xC3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*A with tilde*/
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{0xC8, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*E with grave*/
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{0xCC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*I with grave*/
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{0xCD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xCE, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD4, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD5, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xD1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xDB, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xDD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xE0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xE1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xE2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xE3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1}, /*a with tilde*/
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{0xE8, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xE9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xEA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xEC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xED, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xEE, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xF1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*n with tilde*/
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{0xF2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xF3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xF4, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xF5, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1}, /*o with tilde*/
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{0xF9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xFA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xFB, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0xFD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x100, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x101, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x102, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x103, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x106, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x108, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x109, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x10A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x10B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x10C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x10D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x10E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x112, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x113, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x114, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x115, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x116, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x117, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x11B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x11C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x11D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x11E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x11F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x120, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x121, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x123, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x124, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x125, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x128, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x129, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1}, /*i with tilde*/
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{0x12A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x12B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x12C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x12D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x12F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x130, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x134, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x135, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x139, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x13A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x143, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x144, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x147, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x14C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x14D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x14E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x14F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x154, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x155, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x158, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x159, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x15A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x15B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x15C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x15D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x160, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x161, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x164, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x168, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x169, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1}, /*u with tilde*/
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{0x16A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x16B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x16C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x16D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x174, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x175, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x176, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x177, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x179, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x17A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x17B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x17C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x17D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
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{0x17E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}
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};
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/*Helper function: get the adjustment database entry for a codepoint*/
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FT_LOCAL_DEF( const AF_AdjustmentDatabaseEntry* )
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af_adjustment_database_lookup( FT_UInt32 codepoint ) {
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/* Binary search for database entry */
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FT_Int low = 0;
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FT_Int high = AF_ADJUSTMENT_DATABASE_LENGTH - 1;
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while ( high >= low )
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{
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FT_Int mid = ( low + high ) / 2;
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FT_UInt32 mid_codepoint = adjustment_database[mid].codepoint;
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if ( mid_codepoint < codepoint )
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{
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low = mid + 1;
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}
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else if ( mid_codepoint > codepoint )
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{
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high = mid - 1;
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}
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else
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{
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return &adjustment_database[mid];
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}
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}
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return NULL;
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}
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FT_LOCAL_DEF( AF_VerticalSeparationAdjustmentType )
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af_lookup_vertical_seperation_type( AF_ReverseCharacterMap map, FT_Int glyph_index ) {
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FT_UInt32 codepoint = af_reverse_character_map_lookup( map, glyph_index );
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const AF_AdjustmentDatabaseEntry *entry = af_adjustment_database_lookup( codepoint );
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if ( entry == NULL )
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{
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return AF_VERTICAL_ADJUSTMENT_NONE;
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}
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return entry->vertical_separation_adjustment_type;
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}
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/*1 if tilde correction should be applied to the topmost contour
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else 0*/
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FT_LOCAL_DEF( FT_Bool )
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af_lookup_tilde_correction_type( AF_ReverseCharacterMap map, FT_Int glyph_index ) {
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FT_UInt32 codepoint = af_reverse_character_map_lookup( map, glyph_index );
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const AF_AdjustmentDatabaseEntry *entry = af_adjustment_database_lookup( codepoint );
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if ( entry == NULL )
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{
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return 0;
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}
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return entry->apply_tilde;
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}
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typedef struct AF_ReverseMapEntry_
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{
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FT_Int glyph_index;
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FT_UInt32 codepoint;
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} AF_ReverseMapEntry;
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typedef struct AF_ReverseCharacterMap_
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{
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FT_Long length;
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AF_ReverseMapEntry *entries;
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} AF_ReverseCharacterMap_Rec;
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/* qsort compare function for reverse character map */
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FT_LOCAL_DEF( FT_Int )
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af_reverse_character_map_entry_compare( const void *a, const void *b ) {
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const AF_ReverseMapEntry entry_a = *((const AF_ReverseMapEntry *)a);
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const AF_ReverseMapEntry entry_b = *((const AF_ReverseMapEntry *)b);
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return entry_a.glyph_index < entry_b.glyph_index ? -1 : entry_a.glyph_index > entry_b.glyph_index ? 1 : 0;
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}
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FT_LOCAL_DEF( FT_UInt32 )
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af_reverse_character_map_lookup_( AF_ReverseCharacterMap map, FT_Int glyph_index, FT_Long length )
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{
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if ( map == NULL )
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{
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return 0;
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}
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/* Binary search for reverse character map entry */
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FT_Int low = 0;
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FT_Int high = length - 1;
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while ( high >= low )
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{
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FT_Int mid = ( high + low ) / 2;
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FT_Int mid_glyph_index = map->entries[mid].glyph_index;
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if ( glyph_index < mid_glyph_index )
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{
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high = mid - 1;
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}
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else if ( glyph_index > mid_glyph_index )
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{
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low = mid + 1;
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}
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else
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{
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return map->entries[mid].codepoint;
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}
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}
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return 0;
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}
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FT_LOCAL_DEF( FT_UInt32 )
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af_reverse_character_map_lookup( AF_ReverseCharacterMap map, FT_Int glyph_index )
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{
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if ( map == NULL ) {
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return 0;
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}
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return af_reverse_character_map_lookup_( map, glyph_index, map->length );
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}
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/*prepare to add one more entry to the reverse character map
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this is a helper for af_reverse_character_map_new*/
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_expand( AF_ReverseCharacterMap map, FT_Long *capacity, FT_Memory memory )
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{
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FT_Error error;
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if ( map->length < *capacity )
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{
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return FT_Err_Ok;
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}
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if ( map->length == *capacity )
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{
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FT_Long new_capacity = *capacity + *capacity / 2;
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if ( FT_RENEW_ARRAY( map->entries, map->length, new_capacity ) ) {
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return error;
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}
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*capacity = new_capacity;
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}
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return FT_Err_Ok;
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}
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_new( AF_ReverseCharacterMap *map, AF_FaceGlobals globals )
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{
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*map = NULL;
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FT_Face face = globals->face;
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FT_Memory memory = face->memory;
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/* Search for a unicode charmap */
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/* If there isn't one, create a blank map */
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FT_TRACE4(( "af_reverse_character_map_new: building reverse character map\n" ));
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FT_Error error;
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/* backup face->charmap because find_unicode_charmap sets it */
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FT_CharMap old_charmap = face->charmap;
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if ( ( error = find_unicode_charmap( face ) ) )
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{
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*map = NULL;
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goto Exit;
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}
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if ( FT_NEW( *map ) )
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{
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goto Exit;
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}
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FT_Long capacity = 10;
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( *map )->length = 0;
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if ( FT_NEW_ARRAY( ( *map )->entries, capacity) )
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{
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goto Exit;
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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int failed_lookups = 0;
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#endif
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for ( FT_Int i = 0; i < AF_ADJUSTMENT_DATABASE_LENGTH; i++ )
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{
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FT_UInt32 codepoint = adjustment_database[i].codepoint;
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FT_Int glyph = FT_Get_Char_Index( face, codepoint );
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if ( glyph == 0 )
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{
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#ifdef FT_DEBUG_LEVEL_TRACE
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failed_lookups++;
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#endif
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continue;
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}
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error = af_reverse_character_map_expand( *map, &capacity, memory );
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if ( error ) {
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goto Exit;
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}
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( *map )->length++;
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( *map )->entries[i].glyph_index = glyph;
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( *map )->entries[i].codepoint = codepoint;
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}
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ft_qsort(
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( *map )->entries,
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( *map )->length,
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sizeof( AF_ReverseMapEntry ),
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af_reverse_character_map_entry_compare
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);
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FT_TRACE4(( " reverse character map built successfully"\
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" with %d entries\n", (*map)->length ));
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Exit:
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face->charmap = old_charmap;
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if ( error )
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{
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FT_TRACE4(( " error while building reverse character map. Using blank map.\n" ));
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if ( *map )
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{
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FT_FREE( ( *map )->entries );
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}
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FT_FREE( *map );
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*map = NULL;
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return error;
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}
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return FT_Err_Ok;
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}
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_done( AF_ReverseCharacterMap map, FT_Memory memory ) {
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if ( map != NULL ) {
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FT_FREE( map->entries );
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}
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FT_FREE( map );
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return FT_Err_Ok;
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}
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