tt_driver_init( FT_Module ttdriver ) /* TT_Driver */
{
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
TT_Driver driver = (TT_Driver)ttdriver;
if ( !TT_New_Context( driver ) )
return TT_Err_Could_Not_Find_Context;
#else
FT_UNUSED( ttdriver );
#endif
return TT_Err_Ok;
}
LOCAL_DEF
FT_Error TT_Reset_Size(TT_Size size)
{
TT_Face face;
FT_Error error = TT_Err_Ok;
FT_Size_Metrics *metrics;
if(size->ttmetrics.valid)
{
return TT_Err_Ok;
}
face = (TT_Face)size->root.face;
metrics = &size->root.metrics;
if(metrics->x_ppem < 1 || metrics->y_ppem < 1)
{
return TT_Err_Invalid_PPem;
}
/* compute new transformation */
if(metrics->x_ppem >= metrics->y_ppem)
{
size->ttmetrics.scale = metrics->x_scale;
size->ttmetrics.ppem = metrics->x_ppem;
size->ttmetrics.x_ratio = 0x10000L;
size->ttmetrics.y_ratio = FT_MulDiv(metrics->y_ppem,
0x10000L,
metrics->x_ppem);
}
else
{
size->ttmetrics.scale = metrics->y_scale;
size->ttmetrics.ppem = metrics->y_ppem;
size->ttmetrics.x_ratio = FT_MulDiv(metrics->x_ppem,
0x10000L,
metrics->y_ppem);
size->ttmetrics.y_ratio = 0x10000L;
}
/* Compute root ascender, descender, test height, and max_advance */
metrics->ascender = (FT_MulFix(face->root.ascender,
metrics->y_scale) + 32) & - 64;
metrics->descender = (FT_MulFix(face->root.descender,
metrics->y_scale) + 32) & - 64;
metrics->height = (FT_MulFix(face->root.height,
metrics->y_scale) + 32) & - 64;
metrics->max_advance = (FT_MulFix(face->root.max_advance_width,
metrics->x_scale) + 32) & - 64;
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
{
TT_ExecContext exec;
FT_UInt i, j;
/* Scale the cvt values to the new ppem. */
/* We use by default the y ppem to scale the CVT. */
for(i = 0; i < size->cvt_size; i++)
size->cvt[i] = FT_MulFix(face->cvt[i], size->ttmetrics.scale);
/* All twilight points are originally zero */
for(j = 0; j < size->twilight.n_points; j++)
{
size->twilight.org[j].x = 0;
size->twilight.org[j].y = 0;
size->twilight.cur[j].x = 0;
size->twilight.cur[j].y = 0;
}
/* clear storage area */
for(i = 0; i < size->storage_size; i++)
size->storage[i] = 0;
size->GS = tt_default_graphics_state;
/* get execution context and run prep program */
if(size->debug)
{
exec = size->context;
}
else
{
exec = TT_New_Context(face);
}
/* debugging instances have their own context */
if(!exec)
{
return TT_Err_Could_Not_Find_Context;
}
TT_Load_Context(exec, face, size);
TT_Set_CodeRange(exec,
tt_coderange_cvt,
face->cvt_program,
face->cvt_program_size);
TT_Clear_CodeRange(exec, tt_coderange_glyph);
exec->instruction_trap = FALSE;
exec->top = 0;
exec->callTop = 0;
if(face->cvt_program_size > 0)
{
error = TT_Goto_CodeRange(exec, tt_coderange_cvt, 0);
if(error)
{
goto End;
}
if(!size->debug)
{
error = face->interpreter(exec);
}
}
else
{
error = TT_Err_Ok;
}
size->GS = exec->GS;
/* save default graphics state */
End:
TT_Save_Context(exec, size);
if(!size->debug)
{
TT_Done_Context(exec);
}
/* debugging instances keep their context */
}
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
if(!error)
{
size->ttmetrics.valid = TRUE;
}
return error;
}
LOCAL_DEF
FT_Error TT_Init_Size(TT_Size size)
{
FT_Error error = TT_Err_Ok;
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
TT_Face face = (TT_Face)size->root.face;
FT_Memory memory = face->root.memory;
FT_Int i;
TT_ExecContext exec;
FT_UShort n_twilight;
TT_MaxProfile *maxp = &face->max_profile;
size->ttmetrics.valid = FALSE;
size->max_function_defs = maxp->maxFunctionDefs;
size->max_instruction_defs = maxp->maxInstructionDefs;
size->num_function_defs = 0;
size->num_instruction_defs = 0;
size->max_func = 0;
size->max_ins = 0;
size->cvt_size = face->cvt_size;
size->storage_size = maxp->maxStorage;
/* Set default metrics */
{
FT_Size_Metrics *metrics = &size->root.metrics;
TT_Size_Metrics *metrics2 = &size->ttmetrics;
metrics->x_ppem = 0;
metrics->y_ppem = 0;
metrics2->rotated = FALSE;
metrics2->stretched = FALSE;
/* set default compensation (all 0) */
for(i = 0; i < 4; i++)
metrics2->compensations[i] = 0;
}
/* allocate function defs, instruction defs, cvt, and storage area */
if(ALLOC_ARRAY(size->function_defs,
size->max_function_defs,
TT_DefRecord) ||
ALLOC_ARRAY(size->instruction_defs,
size->max_instruction_defs,
TT_DefRecord) ||
ALLOC_ARRAY(size->cvt,
size->cvt_size, FT_Long) ||
ALLOC_ARRAY(size->storage,
size->storage_size, FT_Long))
{
goto Fail_Memory;
}
/* reserve twilight zone */
n_twilight = maxp->maxTwilightPoints;
error = TT_New_GlyphZone(memory, n_twilight, 0, &size->twilight);
if(error)
{
goto Fail_Memory;
}
size->twilight.n_points = n_twilight;
/* set `face->interpreter' according to the debug hook present */
{
FT_Library library = face->root.driver->root.library;
face->interpreter = (TT_Interpreter)
library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
if(!face->interpreter)
{
face->interpreter = (TT_Interpreter)TT_RunIns;
}
}
/* Fine, now execute the font program! */
exec = size->context;
/* size objects used during debugging have their own context */
if(!size->debug)
{
exec = TT_New_Context(face);
}
if(!exec)
{
error = TT_Err_Could_Not_Find_Context;
goto Fail_Memory;
}
size->GS = tt_default_graphics_state;
TT_Load_Context(exec, face, size);
exec->callTop = 0;
exec->top = 0;
exec->period = 64;
exec->phase = 0;
exec->threshold = 0;
{
FT_Size_Metrics *metrics = &exec->metrics;
TT_Size_Metrics *tt_metrics = &exec->tt_metrics;
metrics->x_ppem = 0;
metrics->y_ppem = 0;
metrics->x_scale = 0;
metrics->y_scale = 0;
tt_metrics->ppem = 0;
tt_metrics->scale = 0;
tt_metrics->ratio = 0x10000L;
}
exec->instruction_trap = FALSE;
exec->cvtSize = size->cvt_size;
exec->cvt = size->cvt;
exec->F_dot_P = 0x10000L;
/* allow font program execution */
TT_Set_CodeRange(exec,
tt_coderange_font,
face->font_program,
face->font_program_size);
/* disable CVT and glyph programs coderange */
TT_Clear_CodeRange(exec, tt_coderange_cvt);
TT_Clear_CodeRange(exec, tt_coderange_glyph);
if(face->font_program_size > 0)
{
error = TT_Goto_CodeRange(exec, tt_coderange_font, 0);
if(!error)
{
error = face->interpreter(exec);
}
if(error)
{
goto Fail_Exec;
}
}
else
{
error = TT_Err_Ok;
}
TT_Save_Context(exec, size);
if(!size->debug)
{
TT_Done_Context(exec);
}
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
size->ttmetrics.valid = FALSE;
return error;
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Fail_Exec:
if(!size->debug)
{
TT_Done_Context(exec);
}
Fail_Memory:
#endif
TT_Done_Size(size);
return error;
}
/* We do this only if bytecode interpretation is really needed. */
static FT_Error
tt_size_init_bytecode( FT_Size ftsize,
FT_Bool pedantic )
{
FT_Error error;
TT_Size size = (TT_Size)ftsize;
TT_Face face = (TT_Face)ftsize->face;
FT_Memory memory = face->root.memory;
FT_UShort n_twilight;
TT_MaxProfile* maxp = &face->max_profile;
/* clean up bytecode related data */
FT_FREE( size->function_defs );
FT_FREE( size->instruction_defs );
FT_FREE( size->cvt );
FT_FREE( size->storage );
if ( size->context )
TT_Done_Context( size->context );
tt_glyphzone_done( &size->twilight );
size->bytecode_ready = -1;
size->cvt_ready = -1;
size->context = TT_New_Context( (TT_Driver)face->root.driver );
size->max_function_defs = maxp->maxFunctionDefs;
size->max_instruction_defs = maxp->maxInstructionDefs;
size->num_function_defs = 0;
size->num_instruction_defs = 0;
size->max_func = 0;
size->max_ins = 0;
size->cvt_size = face->cvt_size;
size->storage_size = maxp->maxStorage;
/* Set default metrics */
{
TT_Size_Metrics* metrics = &size->ttmetrics;
metrics->rotated = FALSE;
metrics->stretched = FALSE;
/* set default engine compensation */
metrics->compensations[0] = 0; /* gray */
metrics->compensations[1] = 0; /* black */
metrics->compensations[2] = 0; /* white */
metrics->compensations[3] = 0; /* reserved */
}
/* allocate function defs, instruction defs, cvt, and storage area */
if ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) ||
FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) ||
FT_NEW_ARRAY( size->cvt, size->cvt_size ) ||
FT_NEW_ARRAY( size->storage, size->storage_size ) )
goto Exit;
/* reserve twilight zone */
n_twilight = maxp->maxTwilightPoints;
/* there are 4 phantom points (do we need this?) */
n_twilight += 4;
error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight );
if ( error )
goto Exit;
size->twilight.n_points = n_twilight;
size->GS = tt_default_graphics_state;
/* set `face->interpreter' according to the debug hook present */
{
FT_Library library = face->root.driver->root.library;
face->interpreter = (TT_Interpreter)
library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
if ( !face->interpreter )
face->interpreter = (TT_Interpreter)TT_RunIns;
}
/* Fine, now run the font program! */
/* In case of an error while executing `fpgm', we intentionally don't */
/* clean up immediately – bugs in the `fpgm' are so fundamental that */
/* all following hinting calls should fail. Additionally, `fpgm' is */
/* to be executed just once; calling it again is completely useless */
/* and might even lead to extremely slow behaviour if it is malformed */
/* (containing an infinite loop, for example). */
error = tt_size_run_fpgm( size, pedantic );
return error;
Exit:
if ( error )
tt_size_done_bytecode( ftsize );
return error;
}
