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freetype2/src/base/ftobjs.c

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/***************************************************************************/
/* */
/* ftobjs.c */
/* */
/* The FreeType private base classes (base). */
/* */
/* Copyright 1996-2000 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftlist.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/tttables.h>
#include <string.h> /* for strcmp() */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M E M O R Y ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_memory
/*************************************************************************/
/* */
/* <Function> */
/* FT_Alloc */
/* */
/* <Description> */
/* Allocates a new block of memory. The returned area is always */
/* zero-filled; this is a strong convention in many FreeType parts. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* allocation. */
/* */
/* size :: The size in bytes of the block to allocate. */
/* */
/* <Output> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
BASE_FUNC( FT_Error ) FT_Alloc( FT_Memory memory,
FT_Long size,
void** P )
{
FT_Assert( P != 0 );
if ( size > 0 )
{
*P = memory->alloc( memory, size );
if ( !*P )
{
FT_ERROR(( "FT_Alloc:" ));
FT_ERROR(( " Out of memory? (%ld requested)\n",
size ));
return FT_Err_Out_Of_Memory;
}
MEM_Set( *P, 0, size );
}
else
*P = NULL;
FT_TRACE7(( "FT_Alloc:" ));
FT_TRACE7(( " size = %ld, block = 0x%08p, ref = 0x%08p\n",
size, *P, P ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Realloc */
/* */
/* <Description> */
/* Reallocates a block of memory pointed to by `*P' to `Size' bytes */
/* from the heap, possibly changing `*P'. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* reallocation. */
/* */
/* current :: The current block size in bytes. */
/* */
/* size :: The new block size in bytes. */
/* */
/* <InOut> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* All callers of FT_Realloc() _must_ provide the current block size */
/* as well as the new one. */
/* */
BASE_FUNC( FT_Error ) FT_Realloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P )
{
void* Q;
FT_Assert( P != 0 );
/* if the original pointer is NULL, call FT_Alloc() */
if ( !*P )
return FT_Alloc( memory, size, P );
/* if the new block if zero-sized, clear the current one */
if ( size <= 0 )
{
FT_Free( memory, P );
return FT_Err_Ok;
}
Q = memory->realloc( memory, current, size, *P );
if ( !Q )
goto Fail;
*P = Q;
return FT_Err_Ok;
Fail:
FT_ERROR(( "FT_Realloc:" ));
FT_ERROR(( " Failed (current %ld, requested %ld)\n",
current, size ));
return FT_Err_Out_Of_Memory;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Free */
/* */
/* <Description> */
/* Releases a given block of memory allocated through FT_Alloc(). */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* memory deallocation */
/* */
/* P :: This is the _address_ of a _pointer_ which points to the */
/* allocated block. It is always set to NULL on exit. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If P or *P are NULL, this function should return successfully. */
/* This is a strong convention within all of FreeType and its */
/* drivers. */
/* */
BASE_FUNC( void ) FT_Free( FT_Memory memory,
void** P )
{
FT_TRACE7(( "FT_Free:" ));
FT_TRACE7(( " Freeing block 0x%08p, ref 0x%08p\n",
P, P ? *P : (void*)0 ));
if ( P && *P )
{
memory->free( memory, *P );
*P = 0;
}
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** S T R E A M ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* ft_new_input_stream */
/* */
/* <Description> */
/* Creates a new input stream object from an FT_Open_Args structure. */
/* */
/* <Note> */
/* The function expects a valid `astream' parameter. */
static
FT_Error ft_new_input_stream( FT_Library library,
FT_Open_Args* args,
FT_Stream* astream )
{
FT_Error error;
FT_Memory memory;
FT_Stream stream;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !args )
return FT_Err_Invalid_Argument;
*astream = 0;
memory = library->memory;
if ( ALLOC( stream, sizeof ( *stream ) ) )
goto Exit;
stream->memory = memory;
/* now, look at the stream flags */
if ( args->flags & ft_open_memory )
{
error = 0;
FT_New_Memory_Stream( library,
args->memory_base,
args->memory_size,
stream );
}
else if ( args->flags & ft_open_pathname )
{
error = FT_New_Stream( args->pathname, stream );
stream->pathname.pointer = args->pathname;
}
else if ( args->flags & ft_open_stream && args->stream )
{
*stream = *(args->stream);
stream->memory = memory;
}
else
error = FT_Err_Invalid_Argument;
if ( error )
FREE( stream );
*astream = stream;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Stream */
/* */
/* <Description> */
/* Closes and destroys a stream object. */
/* */
/* <Input> */
/* stream :: The stream to be closed and destroyed. */
/* */
FT_EXPORT_FUNC( void ) FT_Done_Stream( FT_Stream stream )
{
if ( stream && stream->close )
stream->close( stream );
}
static
void ft_done_stream( FT_Stream* astream )
{
FT_Stream stream = *astream;
FT_Memory memory = stream->memory;
if ( stream->close )
stream->close( stream );
FREE( stream );
*astream = 0;
}
#undef FT_COMPONENT
#define FT_COMPONENT trace_objs
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** G L Y P H L O A D E R ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* The glyph loader is a simple object which is used to load a set of */
/* glyphs easily. It is critical for the correct loading of composites. */
/* */
/* Ideally, one can see it as a stack of abstract `glyph' objects. */
/* */
/* loader.base Is really the bottom of the stack. It describes a */
/* single glyph image made of the juxtaposition of */
/* several glyphs (those `in the stack'). */
/* */
/* loader.current Describes the top of the stack, on which a new */
/* glyph can be loaded. */
/* */
/* Rewind Clears the stack. */
/* Prepare Set up `loader.current' for addition of a new glyph */
/* image. */
/* Add Add the `current' glyph image to the `base' one, */
/* and prepare for another one. */
/* */
/* The glyph loader is now a base object. Each driver used to */
/* re-implement it in one way or the other, which wasted code and */
/* energy. */
/* */
/*************************************************************************/
/* create a new glyph loader */
BASE_FUNC( FT_Error ) FT_GlyphLoader_New( FT_Memory memory,
FT_GlyphLoader** aloader )
{
FT_GlyphLoader* loader;
FT_Error error;
if ( !ALLOC( loader, sizeof ( *loader ) ) )
{
loader->memory = memory;
*aloader = loader;
}
return error;
}
/* rewind the glyph loader - reset counters to 0 */
BASE_FUNC( void ) FT_GlyphLoader_Rewind( FT_GlyphLoader* loader )
{
FT_GlyphLoad* base = &loader->base;
FT_GlyphLoad* current = &loader->current;
base->outline.n_points = 0;
base->outline.n_contours = 0;
base->num_subglyphs = 0;
*current = *base;
}
/* reset the glyph loader, frees all allocated tables */
/* and starts from zero */
BASE_FUNC( void ) FT_GlyphLoader_Reset( FT_GlyphLoader* loader )
{
FT_Memory memory = loader->memory;
FREE( loader->base.outline.points );
FREE( loader->base.outline.tags );
FREE( loader->base.outline.contours );
FREE( loader->base.extra_points );
FREE( loader->base.subglyphs );
loader->max_points = 0;
loader->max_contours = 0;
loader->max_subglyphs = 0;
FT_GlyphLoader_Rewind( loader );
}
/* delete a glyph loader */
BASE_FUNC( void ) FT_GlyphLoader_Done( FT_GlyphLoader* loader )
{
if ( loader )
{
FT_Memory memory = loader->memory;
FT_GlyphLoader_Reset(loader);
FREE( loader );
}
}
/* re-adjust the `current' outline fields */
static void FT_GlyphLoader_Adjust_Points( FT_GlyphLoader* loader )
{
FT_Outline* base = &loader->base.outline;
FT_Outline* current = &loader->current.outline;
current->points = base->points + base->n_points;
current->tags = base->tags + base->n_points;
current->contours = base->contours + base->n_contours;
/* handle extra points table - if any */
if ( loader->use_extra )
loader->current.extra_points =
loader->base.extra_points + base->n_points;
}
BASE_FUNC( FT_Error ) FT_GlyphLoader_Create_Extra(
FT_GlyphLoader* loader )
{
FT_Error error;
FT_Memory memory = loader->memory;
if ( !ALLOC_ARRAY( loader->base.extra_points,
loader->max_points, FT_Vector ) )
{
loader->use_extra = 1;
FT_GlyphLoader_Adjust_Points( loader );
}
return error;
}
/* re-adjust the `current' subglyphs field */
static void FT_GlyphLoader_Adjust_Subglyphs( FT_GlyphLoader* loader )
{
FT_GlyphLoad* base = &loader->base;
FT_GlyphLoad* current = &loader->current;
current->subglyphs = base->subglyphs + base->num_subglyphs;
}
/* Ensure that we can add `n_points' and `n_contours' to our glyph. this */
/* function reallocates its outline tables if necessary. Note that it */
/* DOESN'T change the number of points within the loader! */
BASE_FUNC( FT_Error ) FT_GlyphLoader_Check_Points(
FT_GlyphLoader* loader,
FT_UInt n_points,
FT_UInt n_contours )
{
FT_Memory memory = loader->memory;
FT_Error error = FT_Err_Ok;
FT_Outline* base = &loader->base.outline;
FT_Outline* current = &loader->current.outline;
FT_Bool adjust = 1;
FT_UInt new_max;
/* check points & tags */
new_max = base->n_points + current->n_points + n_points;
if ( new_max > loader->max_points )
{
new_max = ( new_max + 7 ) & -8;
if ( REALLOC_ARRAY( base->points, base->n_points,
new_max, FT_Vector ) ||
REALLOC_ARRAY( base->tags, base->n_points,
new_max, FT_Byte ) )
goto Exit;
if ( loader->use_extra &&
REALLOC_ARRAY( loader->base.extra_points, base->n_points,
new_max, FT_Vector ) )
goto Exit;
adjust = 1;
loader->max_points = new_max;
}
/* check contours */
new_max = base->n_contours + current->n_contours +
n_contours;
if ( new_max > loader->max_contours )
{
new_max = ( new_max + 3 ) & -4;
if ( REALLOC_ARRAY( base->contours, base->n_contours,
new_max, FT_Short ) )
goto Exit;
adjust = 1;
loader->max_contours = new_max;
}
if ( adjust )
FT_GlyphLoader_Adjust_Points( loader );
Exit:
return error;
}
/* Ensure that we can add `n_subglyphs' to our glyph. this function */
/* reallocates its subglyphs table if necessary. Note that it DOES */
/* NOT change the number of subglyphs within the loader! */
BASE_FUNC( FT_Error ) FT_GlyphLoader_Check_Subglyphs(
FT_GlyphLoader* loader,
FT_UInt n_subs )
{
FT_Memory memory = loader->memory;
FT_Error error = FT_Err_Ok;
FT_UInt new_max;
FT_GlyphLoad* base = &loader->base;
FT_GlyphLoad* current = &loader->current;
new_max = base->num_subglyphs + current->num_subglyphs + n_subs;
if ( new_max > loader->max_subglyphs )
{
new_max = ( new_max + 1 ) & -2;
if ( REALLOC_ARRAY( base->subglyphs, base->num_subglyphs,
new_max, FT_SubGlyph ) )
goto Exit;
loader->max_subglyphs = new_max;
FT_GlyphLoader_Adjust_Subglyphs( loader );
}
Exit:
return error;
}
/* prepare loader for the addition of a new glyph on top of the base one */
BASE_FUNC( void ) FT_GlyphLoader_Prepare( FT_GlyphLoader* loader )
{
FT_GlyphLoad* current = &loader->current;
current->outline.n_points = 0;
current->outline.n_contours = 0;
current->num_subglyphs = 0;
FT_GlyphLoader_Adjust_Points ( loader );
FT_GlyphLoader_Adjust_Subglyphs( loader );
}
/* add current glyph to the base image - and prepare for another */
BASE_FUNC( void ) FT_GlyphLoader_Add( FT_GlyphLoader* loader )
{
FT_GlyphLoad* base = &loader->base;
FT_GlyphLoad* current = &loader->current;
FT_UInt n_curr_contours = current->outline.n_contours;
FT_UInt n_base_points = base->outline.n_points;
FT_UInt n;
base->outline.n_points += current->outline.n_points;
base->outline.n_contours += current->outline.n_contours;
base->num_subglyphs += current->num_subglyphs;
/* adjust contours count in newest outline */
for ( n = 0; n < n_curr_contours; n++ )
current->outline.contours[n] += n_base_points;
/* prepare for another new glyph image */
FT_GlyphLoader_Prepare( loader );
}
BASE_FUNC( FT_Error ) FT_GlyphLoader_Copy_Points(
FT_GlyphLoader* target,
FT_GlyphLoader* source )
{
FT_Error error;
FT_UInt num_points = source->base.outline.n_points;
FT_UInt num_contours = source->base.outline.n_contours;
error = FT_GlyphLoader_Check_Points( target, num_points, num_contours );
if ( !error )
{
FT_Outline* out = &target->base.outline;
FT_Outline* in = &source->base.outline;
MEM_Copy( out->points, in->points,
num_points * sizeof ( FT_Vector ) );
MEM_Copy( out->tags, in->tags,
num_points * sizeof ( char ) );
MEM_Copy( out->contours, in->contours,
num_contours * sizeof ( short ) );
/* do we need to copy the extra points? */
if ( target->use_extra && source->use_extra )
MEM_Copy( target->base.extra_points, source->base.extra_points,
num_points * sizeof ( FT_Vector ) );
out->n_points = num_points;
out->n_contours = num_contours;
FT_GlyphLoader_Adjust_Points( target );
}
return error;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** FACE, SIZE & GLYPH SLOT OBJECTS ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
static FT_Error ft_glyphslot_init( FT_GlyphSlot slot )
{
FT_Driver driver = slot->face->driver;
FT_Driver_Class* clazz = driver->clazz;
FT_Memory memory = driver->root.memory;
FT_Error error = FT_Err_Ok;
if ( FT_DRIVER_USES_OUTLINES( driver ) )
error = FT_GlyphLoader_New( memory, &slot->loader );
if ( !error && clazz->init_slot )
error = clazz->init_slot( slot );
return error;
}
static void ft_glyphslot_clear( FT_GlyphSlot slot )
{
/* clear all public fields in the glyph slot */
MEM_Set( &slot->metrics, 0, sizeof ( slot->metrics ) );
MEM_Set( &slot->outline, 0, sizeof ( slot->outline ) );
MEM_Set( &slot->bitmap, 0, sizeof ( slot->bitmap ) );
slot->bitmap_left = 0;
slot->bitmap_top = 0;
slot->num_subglyphs = 0;
slot->subglyphs = 0;
slot->control_data = 0;
slot->control_len = 0;
slot->other = 0;
slot->format = 0;
slot->linearHoriAdvance = 0;
slot->linearVertAdvance = 0;
}
static void ft_glyphslot_done( FT_GlyphSlot slot )
{
FT_Driver driver = slot->face->driver;
FT_Driver_Class* clazz = driver->clazz;
FT_Memory memory = driver->root.memory;
/* free bitmap buffer if needed */
if ( slot->flags & ft_glyph_own_bitmap )
FREE( slot->bitmap.buffer );
/* free glyph loader */
if ( FT_DRIVER_USES_OUTLINES( driver ) )
{
FT_GlyphLoader_Done( slot->loader );
slot->loader = 0;
}
if ( clazz->done_slot )
clazz->done_slot( slot );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_GlyphSlot */
/* */
/* <Description> */
/* It is sometimes useful to have more than one glyph slot for a */
/* given face object. This function is used to create additional */
/* slots. All of them are automatically discarded when the face is */
/* destroyed. */
/* */
/* <Input> */
/* face :: A handle to a parent face object. */
/* */
/* <Output> */
/* aslot :: A handle to a new glyph slot object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_GlyphSlot( FT_Face face,
FT_GlyphSlot* aslot )
{
FT_Error error;
FT_Driver driver;
FT_Driver_Class* clazz;
FT_Memory memory;
FT_GlyphSlot slot;
*aslot = 0;
if ( !face || !aslot || !face->driver )
return FT_Err_Invalid_Argument;
driver = face->driver;
clazz = driver->clazz;
memory = driver->root.memory;
FT_TRACE4(( "FT_New_GlyphSlot: Creating new slot object\n" ));
if ( !ALLOC( slot, clazz->slot_object_size ) )
{
slot->face = face;
error = ft_glyphslot_init( slot );
if ( error )
{
ft_glyphslot_done( slot );
FREE( slot );
goto Exit;
}
*aslot = slot;
}
Exit:
FT_TRACE4(( "FT_New_GlyphSlot: Return %d\n", error ));
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_GlyphSlot */
/* */
/* <Description> */
/* Destroys a given glyph slot. Remember however that all slots are */
/* automatically destroyed with its parent. Using this function is */
/* not always mandatory. */
/* */
/* <Input> */
/* slot :: A handle to a target glyph slot. */
/* */
FT_EXPORT_FUNC( void ) FT_Done_GlyphSlot( FT_GlyphSlot slot )
{
if ( slot )
{
FT_Driver driver = slot->face->driver;
FT_Memory memory = driver->root.memory;
FT_GlyphSlot* parent;
FT_GlyphSlot cur;
/* Remove slot from its parent face's list */
parent = &slot->face->glyph;
cur = *parent;
while ( cur )
{
if ( cur == slot )
{
*parent = cur->next;
ft_glyphslot_done( slot );
FREE( slot );
break;
}
cur = cur->next;
}
}
}
/* forward declaration */
static FT_Renderer ft_lookup_glyph_renderer( FT_GlyphSlot slot );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Transform */
/* */
/* <Description> */
/* A function used to set the transformation that is applied to glyph */
/* images just before they are converted to bitmaps in a glyph slot */
/* when FT_Render_Glyph() is called. */
/* */
/* <InOut> */
/* face :: A handle to the source face object. */
/* */
/* <Input> */
/* matrix :: A pointer to the transformation's 2x2 matrix. Use 0 for */
/* the identity matrix. */
/* delta :: A pointer to the translation vector. Use 0 for the null */
/* vector. */
/* */
/* <Note> */
/* The transformation is only applied to scalable image formats. */
/* */
FT_EXPORT_FUNC( void ) FT_Set_Transform( FT_Face face,
FT_Matrix* matrix,
FT_Vector* delta )
{
if ( !face )
return;
face->transform_flags = 0;
if ( !matrix )
{
face->transform_matrix.xx = 0x10000L;
face->transform_matrix.xy = 0L;
face->transform_matrix.yx = 0L;
face->transform_matrix.yy = 0x10000L;
matrix = &face->transform_matrix;
}
else
face->transform_matrix = *matrix;
/* set transform_flags bit flag 0 if `matrix' isn't the identity */
if ( ( matrix->xy | matrix->yx ) ||
matrix->xx != 0x10000L ||
matrix->yy != 0x10000L )
face->transform_flags |= 1;
if ( !delta )
{
face->transform_delta.x = 0;
face->transform_delta.y = 0;
delta = &face->transform_delta;
}
else
face->transform_delta = *delta;
/* set transform_flags bit flag 1 if `delta' isn't the null vector */
if ( delta->x | delta->y )
face->transform_flags |= 2;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Glyph */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size. */
/* */
/* <Input> */
/* face :: A handle to the target face object where the glyph */
/* will be loaded. */
/* */
/* glyph_index :: The index of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
/* transformed with the information passed to a previous call to */
/* FT_Set_Transform. */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int load_flags )
{
FT_Error error;
FT_Driver driver;
FT_GlyphSlot slot;
if ( !face || !face->size || !face->glyph )
return FT_Err_Invalid_Face_Handle;
if ( glyph_index >= face->num_glyphs )
return FT_Err_Invalid_Argument;
slot = face->glyph;
ft_glyphslot_clear( slot );
driver = face->driver;
/* when the flag NO_RECURSE is set, we disable hinting and scaling */
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
error = driver->clazz->load_glyph( slot,
face->size,
glyph_index,
load_flags );
if ( error )
goto Exit;
/* compute the advance */
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
{
slot->advance.x = 0;
slot->advance.y = slot->metrics.vertAdvance;
}
else
{
slot->advance.x = slot->metrics.horiAdvance;
slot->advance.y = 0;
}
/* now, transform the glyph image when needed */
if ( face->transform_flags )
{
/* get renderer */
FT_Renderer renderer = ft_lookup_glyph_renderer( slot );
if ( renderer )
error = renderer->clazz->transform_glyph( renderer, slot,
&face->transform_matrix,
&face->transform_delta );
/* transform advance */
FT_Vector_Transform( &slot->advance, &face->transform_matrix );
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Char */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size, according to its character code. */
/* */
/* <Input> */
/* face :: A handle to a target face object where the glyph */
/* will be loaded. */
/* */
/* char_code :: The glyph's character code, according to the */
/* current charmap used in the face. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If the face has no current charmap, or if the character code */
/* is not defined in the charmap, this function will return an */
/* error. */
/* */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
/* transformed with the information passed to a previous call to */
/* FT_Set_Transform(). */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Load_Char( FT_Face face,
FT_ULong char_code,
FT_Int load_flags )
{
FT_UInt glyph_index;
if ( !face )
return FT_Err_Invalid_Face_Handle;
glyph_index = (FT_UInt)char_code;
if ( face->charmap )
glyph_index = FT_Get_Char_Index( face, char_code );
return glyph_index ? FT_Load_Glyph( face, glyph_index, load_flags )
: FT_Err_Invalid_Character_Code;
}
/* destructor for sizes list */
static
void destroy_size( FT_Memory memory,
FT_Size size,
FT_Driver driver )
{
/* finalize client-specific data */
if ( size->generic.finalizer )
size->generic.finalizer( size );
/* finalize format-specific stuff */
if ( driver->clazz->done_size )
driver->clazz->done_size( size );
FREE( size );
}
/* destructor for faces list */
static
void destroy_face( FT_Memory memory,
FT_Face face,
FT_Driver driver )
{
FT_Driver_Class* clazz = driver->clazz;
/* Discard glyph slots for this face */
/* Beware! FT_Done_GlyphSlot() changes the field `face->slot' */
while ( face->glyph )
FT_Done_GlyphSlot( face->glyph );
/* Discard all sizes for this face */
FT_List_Finalize( &face->sizes_list,
(FT_List_Destructor)destroy_size,
memory,
driver );
face->size = 0;
/* Now discard client data */
if ( face->generic.finalizer )
face->generic.finalizer( face );
/* finalize format-specific stuff */
if ( clazz->done_face )
clazz->done_face( face );
/* close the stream for this face if needed */
if ( ( face->face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) == 0 )
ft_done_stream( &face->stream );
/* get rid of it */
FREE( face );
}
static void Destroy_Driver( FT_Driver driver )
{
FT_List_Finalize( &driver->faces_list,
(FT_List_Destructor)destroy_face,
driver->root.memory,
driver );
/* see if we need to drop the driver's glyph loader */
if ( FT_DRIVER_USES_OUTLINES( driver ) )
FT_GlyphLoader_Done( driver->glyph_loader );
}
/*************************************************************************/
/* */
/* <Function> */
/* open_face */
/* */
/* <Description> */
/* This function does some work for FT_Open_Face(). */
/* */
static
FT_Error open_face( FT_Driver driver,
FT_Stream stream,
FT_Long face_index,
FT_Int num_params,
FT_Parameter* params,
FT_Face* aface )
{
FT_Memory memory;
FT_Driver_Class* clazz;
FT_Face face = 0;
FT_Error error;
clazz = driver->clazz;
memory = driver->root.memory;
/* allocate the face object, and perform basic initialization */
if ( ALLOC( face, clazz->face_object_size ) )
goto Fail;
face->driver = driver;
face->memory = memory;
face->stream = stream;
error = clazz->init_face( stream,
face,
face_index,
num_params,
params );
if ( error )
goto Fail;
*aface = face;
Fail:
if ( error )
{
clazz->done_face( face );
FREE( face );
*aface = 0;
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a pathname to the font file. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* pathname :: A path to the font file. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Face( FT_Library library,
const char* pathname,
FT_Long face_index,
FT_Face* aface )
{
FT_Open_Args args;
/* test for valid `library' and `aface' delayed to FT_Open_Face() */
if ( !pathname )
return FT_Err_Invalid_Argument;
args.flags = ft_open_pathname;
args.pathname = (char*)pathname;
return FT_Open_Face( library, &args, face_index, aface );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Memory_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a font file already loaded into memory. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* file_base :: A pointer to the beginning of the font data. */
/* */
/* file_size :: The size of the memory chunk used by the font data. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* face :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Memory_Face() can be used to determine and/or check the */
/* font format of a given font resource. If the `face_index' field */
/* is negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Memory_Face( FT_Library library,
void* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face* face )
{
FT_Open_Args args;
/* test for valid `library' and `face' delayed to FT_Open_Face() */
if ( !file_base )
return FT_Err_Invalid_Argument;
args.flags = ft_open_memory;
args.memory_base = file_base;
args.memory_size = file_size;
return FT_Open_Face( library, &args, face_index, face );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Open_Face */
/* */
/* <Description> */
/* Opens a face object from a given resource and typeface index using */
/* an `FT_Open_Args' structure. If the face object doesn't exist, it */
/* will be created. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* args :: A pointer to an `FT_Open_Args' structure which must */
/* be filled by the caller. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_Open_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Open_Face( FT_Library library,
FT_Open_Args* args,
FT_Long face_index,
FT_Face* aface )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_Face face = 0;
FT_ListNode node = 0;
/* test for valid `library' and `args' delayed to */
/* ft_new_input_stream() */
if ( !aface )
return FT_Err_Invalid_Argument;
*aface = 0;
/* create input stream */
error = ft_new_input_stream( library, args, &stream );
if ( error ) goto Exit;
memory = library->memory;
/* If the font driver is specified in the `args' structure, use */
/* it. Otherwise, we'll scan the list of registered drivers. */
if ( args->flags & ft_open_driver && args->driver )
{
driver = FT_DRIVER( args->driver );
/* not all modules are drivers, so check... */
if ( FT_MODULE_IS_DRIVER( driver ) )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
if ( args->flags & ft_open_params )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
}
else
error = FT_Err_Invalid_Handle;
ft_done_stream( &stream );
goto Fail;
}
else
{
/* check each font driver for an appropriate format */
FT_Module* cur = library->modules;
FT_Module* limit = cur + library->num_modules;
for ( ; cur < limit; cur++ )
{
/* not all modules are font drivers, so check... */
if ( FT_MODULE_IS_DRIVER( cur[0] ) )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
driver = FT_DRIVER( cur[0] );
if ( args->flags & ft_open_params )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
if ( error != FT_Err_Unknown_File_Format )
goto Fail;
}
}
ft_done_stream( &stream );
/* no driver is able to handle this format */
error = FT_Err_Unknown_File_Format;
goto Fail;
}
Success:
FT_TRACE4(( "FT_New_Face: New face object, adding to list\n" ));
/* set the EXTERNAL_STREAM bit for FT_Done_Face */
if ( args->flags & ft_open_stream && args->stream )
face->face_flags |= FT_FACE_FLAG_EXTERNAL_STREAM;
/* add the face object to its driver's list */
if ( ALLOC( node, sizeof ( *node ) ) )
goto Fail;
node->data = face;
/* don't assume driver is the same as face->driver, so use */
/* face->driver instead. */
FT_List_Add( &face->driver->faces_list, node );
/* now allocate a glyph slot object for the face */
{
FT_GlyphSlot slot;
FT_TRACE4(( "FT_Open_Face: Creating glyph slot\n" ));
error = FT_New_GlyphSlot( face, &slot );
if ( error ) goto Fail;
face->glyph = slot;
}
/* finally, allocate a size object for the face */
{
FT_Size size;
FT_TRACE4(( "FT_Open_Face: Creating size object\n" ));
error = FT_New_Size( face, &size );
if ( error ) goto Fail;
face->size = size;
}
/* initialize transformation for convenience functions */
face->transform_matrix.xx = 0x10000L;
face->transform_matrix.xy = 0;
face->transform_matrix.yx = 0;
face->transform_matrix.yy = 0x10000L;
face->transform_delta.x = 0;
face->transform_delta.y = 0;
*aface = face;
goto Exit;
Fail:
FT_Done_Face( face );
Exit:
FT_TRACE4(( "FT_Open_Face: Return %d\n", error ));
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* `Attaches' a given font file to an existing face. This is usually */
/* to read additional information for a single face object. For */
/* example, it is used to read the AFM files that come with Type 1 */
/* fonts in order to add kerning data and other metrics. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* filepathname :: An 8-bit pathname naming the `metrics' file. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, use FT_Attach_Stream(). */
/* */
/* The meaning of the `attach' action (i.e., what really happens when */
/* the new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Attach_File( FT_Face face,
const char* filepathname )
{
FT_Open_Args open;
/* test for valid `face' delayed to FT_Attach_Stream() */
if ( !filepathname )
return FT_Err_Invalid_Argument;
open.flags = ft_open_pathname;
open.pathname = (char*)filepathname;
return FT_Attach_Stream( face, &open );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* This function is similar to FT_Attach_File() with the exception */
/* that it reads the attachment from an arbitrary stream. */
/* */
/* <Input> */
/* face :: The target face object. */
/* */
/* parameters :: A pointer to an FT_Open_Args structure used to */
/* describe the input stream to FreeType. */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The meaning of the `attach' (i.e. what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters )
{
FT_Stream stream;
FT_Error error;
FT_Driver driver;
FT_Driver_Class* clazz;
/* test for valid `parameters' delayed to ft_new_input_stream() */
if ( !face )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
error = ft_new_input_stream( driver->root.library, parameters, &stream );
if ( error )
goto Exit;
/* we implement FT_Attach_Stream in each driver through the */
/* `attach_file' interface */
error = FT_Err_Unimplemented_Feature;
clazz = driver->clazz;
if ( clazz->attach_file )
error = clazz->attach_file( face, stream );
/* close the attached stream */
if ( !parameters->stream || ( parameters->flags & ft_open_stream ) )
ft_done_stream( &stream );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Face */
/* */
/* <Description> */
/* Discards a given face object, as well as all of its child slots */
/* and sizes. */
/* */
/* <Input> */
/* face :: A handle to a target face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Face( FT_Face face )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_ListNode node;
error = FT_Err_Invalid_Face_Handle;
if ( face && face->driver )
{
driver = face->driver;
memory = driver->root.memory;
/* find face in driver's list */
node = FT_List_Find( &driver->faces_list, face );
if ( node )
{
/* remove face object from the driver's list */
FT_List_Remove( &driver->faces_list, node );
FREE( node );
/* now destroy the object proper */
destroy_face( memory, face, driver );
error = FT_Err_Ok;
}
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Size */
/* */
/* <Description> */
/* Creates a new size object from a given face object. */
/* */
/* <Input> */
/* face :: A handle to a parent face object. */
/* */
/* <Output> */
/* asize :: A handle to a new size object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Size( FT_Face face,
FT_Size* asize )
{
FT_Error error;
FT_Memory memory;
FT_Driver driver;
FT_Driver_Class* clazz;
FT_Size size = 0;
FT_ListNode node = 0;
*asize = 0;
if ( !face || !asize || !face->driver )
return FT_Err_Invalid_Handle;
driver = face->driver;
clazz = driver->clazz;
memory = face->memory;
/* Allocate new size object and perform basic initialisation */
if ( ALLOC( size, clazz->size_object_size ) ||
ALLOC( node, sizeof ( FT_ListNodeRec ) ) )
goto Exit;
size->face = face;
if ( clazz->init_size )
error = clazz->init_size( size );
/* in case of success, add to the face's list */
if ( !error )
{
*asize = size;
node->data = size;
FT_List_Add( &face->sizes_list, node );
}
Exit:
if ( error )
{
FREE( node );
FREE( size );
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Size */
/* */
/* <Description> */
/* Discards a given size object. */
/* */
/* <Input> */
/* size :: A handle to a target size object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Size( FT_Size size )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_Face face;
FT_ListNode node;
if ( !size )
return FT_Err_Invalid_Size_Handle;
face = size->face;
if ( !face )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
memory = driver->root.memory;
error = FT_Err_Ok;
node = FT_List_Find( &face->sizes_list, size );
if ( node )
{
FT_List_Remove( &face->sizes_list, node );
FREE( node );
if ( face->size == size )
{
face->size = 0;
if ( face->sizes_list.head )
face->size = (FT_Size)(face->sizes_list.head->data);
}
destroy_size( memory, size, driver );
}
else
error = FT_Err_Invalid_Size_Handle;
return FT_Err_Ok;
}
static void ft_recompute_scaled_metrics( FT_Face face,
FT_Size_Metrics* metrics )
{
/* Compute root ascender, descender, test height, and max_advance */
metrics->ascender = ( FT_MulFix( face->ascender,
metrics->y_scale ) + 32 ) & -64;
metrics->descender = ( FT_MulFix( face->descender,
metrics->y_scale ) + 32 ) & -64;
metrics->height = ( FT_MulFix( face->height,
metrics->y_scale ) + 32 ) & -64;
metrics->max_advance = ( FT_MulFix( face->max_advance_width,
metrics->x_scale ) + 32 ) & -64;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The */
/* `char_width' and `char_height' values are used for the width and */
/* height, respectively, expressed in 26.6 fractional points. */
/* */
/* If the horizontal or vertical resolution values are zero, a */
/* default value of 72dpi is used. Similarly, if one of the */
/* character dimensions is zero, its value is set equal to the other. */
/* */
/* <InOut> */
/* size :: A handle to a target size object. */
/* */
/* <Input> */
/* char_width :: The character width, in 26.6 fractional points. */
/* */
/* char_height :: The character height, in 26.6 fractional */
/* points. */
/* */
/* horz_resolution :: The horizontal resolution. */
/* */
/* vert_resolution :: The vertical resolution. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* When dealing with fixed-size faces (i.e., non-scalable formats), */
/* use the function FT_Set_Pixel_Sizes(). */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Char_Size( FT_Face face,
FT_F26Dot6 char_width,
FT_F26Dot6 char_height,
FT_UInt horz_resolution,
FT_UInt vert_resolution )
{
FT_Error error = FT_Err_Ok;
FT_Driver driver;
FT_Memory memory;
FT_Driver_Class* clazz;
FT_Size_Metrics* metrics;
FT_Long dim_x, dim_y;
if ( !face || !face->size || !face->driver )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
metrics = &face->size->metrics;
if ( !char_width )
char_width = char_height;
else if ( !char_height )
char_height = char_width;
if ( !horz_resolution )
horz_resolution = 72;
if ( !vert_resolution )
vert_resolution = 72;
driver = face->driver;
clazz = driver->clazz;
memory = driver->root.memory;
/* default processing -- this can be overridden by the driver */
if ( char_width < 1 * 64 ) char_width = 1 * 64;
if ( char_height < 1 * 64 ) char_height = 1 * 64;
/* Compute pixel sizes in 26.6 units */
dim_x = ( ( ( char_width * horz_resolution ) / 72 ) + 32 ) & -64;
dim_y = ( ( ( char_height * vert_resolution ) / 72 ) + 32 ) & -64;
metrics->x_ppem = (FT_UShort)(dim_x >> 6);
metrics->y_ppem = (FT_UShort)(dim_y >> 6);
metrics->x_scale = 0x10000L;
metrics->y_scale = 0x10000L;
if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
{
metrics->x_scale = FT_DivFix( dim_x, face->units_per_EM );
metrics->y_scale = FT_DivFix( dim_y, face->units_per_EM );
}
ft_recompute_scaled_metrics( face, metrics );
if ( clazz->set_char_sizes )
error = clazz->set_char_sizes( face->size,
char_width,
char_height,
horz_resolution,
vert_resolution );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Pixel_Sizes */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The width */
/* and height are expressed in integer pixels. */
/* */
/* If one of the character dimensions is zero, its value is set equal */
/* to the other. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* pixel_width :: The character width, in integer pixels. */
/* */
/* pixel_height :: The character height, in integer pixels. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height )
{
FT_Error error = FT_Err_Ok;
FT_Driver driver;
FT_Memory memory;
FT_Driver_Class* clazz;
FT_Size_Metrics* metrics = &face->size->metrics;
if ( !face || !face->size || !face->driver )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
clazz = driver->clazz;
memory = driver->root.memory;
/* default processing -- this can be overridden by the driver */
if ( pixel_width == 0 )
pixel_width = pixel_height;
else if ( pixel_height == 0 )
pixel_height = pixel_width;
if ( pixel_width < 1 ) pixel_width = 1;
if ( pixel_height < 1 ) pixel_height = 1;
metrics->x_ppem = pixel_width;
metrics->y_ppem = pixel_height;
if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
{
metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
face->units_per_EM );
metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
face->units_per_EM );
}
ft_recompute_scaled_metrics( face, metrics );
if ( clazz->set_pixel_sizes )
error = clazz->set_pixel_sizes( face->size,
pixel_width,
pixel_height );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Kerning */
/* */
/* <Description> */
/* Returns the kerning vector between two glyphs of a same face. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* left_glyph :: The index of the left glyph in the kern pair. */
/* */
/* right_glyph :: The index of the right glyph in the kern pair. */
/* */
/* <Output> */
/* kerning :: The kerning vector. This is in font units for */
/* scalable formats, and in pixels for fixed-sizes */
/* formats. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Only horizontal layouts (left-to-right & right-to-left) are */
/* supported by this method. Other layouts, or more sophisticated */
/* kernings, are out of the scope of this API function -- they can be */
/* implemented through format-specific interfaces. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Get_Kerning( FT_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_Vector* kerning )
{
FT_Error error = FT_Err_Ok;
FT_Driver driver;
FT_Memory memory;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !kerning )
return FT_Err_Invalid_Argument;
driver = face->driver;
memory = driver->root.memory;
if ( driver->clazz->get_kerning )
{
error = driver->clazz->get_kerning( face,
left_glyph,
right_glyph,
kerning );
}
else
{
kerning->x = 0;
kerning->y = 0;
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Charmap */
/* */
/* <Description> */
/* Selects a given charmap by its encoding tag (as listed in */
/* `freetype.h'). */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* encoding :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error if no charmap in the face */
/* corresponds to the encoding queried here. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Select_Charmap( FT_Face face,
FT_Encoding encoding )
{
FT_CharMap* cur;
FT_CharMap* limit;
if ( !face )
return FT_Err_Invalid_Face_Handle;
cur = face->charmaps;
if ( !cur )
return FT_Err_Invalid_CharMap_Handle;
limit = cur + face->num_charmaps;
for ( ; cur < limit; cur++ )
{
if ( cur[0]->encoding == encoding )
{
face->charmap = cur[0];
return 0;
}
}
return FT_Err_Invalid_Argument;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Charmap */
/* */
/* <Description> */
/* Selects a given charmap for character code to glyph index */
/* decoding. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* charmap :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error when the charmap is not part */
/* of the face (i.e., if it is not listed in the face->charmaps[] */
/* table). */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Charmap( FT_Face face,
FT_CharMap charmap )
{
FT_CharMap* cur;
FT_CharMap* limit;
if ( !face )
return FT_Err_Invalid_Face_Handle;
cur = face->charmaps;
if ( !cur )
return FT_Err_Invalid_CharMap_Handle;
limit = cur + face->num_charmaps;
for ( ; cur < limit; cur++ )
{
if ( cur[0] == charmap )
{
face->charmap = cur[0];
return 0;
}
}
return FT_Err_Invalid_Argument;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Char_Index */
/* */
/* <Description> */
/* Returns the glyph index of a given character code. This function */
/* uses a charmap object to do the translation. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* charcode :: The character code. */
/* */
/* <Return> */
/* The glyph index. 0 means `undefined character code'. */
/* */
FT_EXPORT_FUNC( FT_UInt ) FT_Get_Char_Index( FT_Face face,
FT_ULong charcode )
{
FT_UInt result;
FT_Driver driver;
result = 0;
if ( face && face->charmap )
{
driver = face->driver;
result = driver->clazz->get_char_index( face->charmap, charcode );
}
return result;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Sfnt_Table */
/* */
/* <Description> */
/* Returns a pointer to a given SFNT table within a face. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* tag :: An index of an SFNT table. */
/* */
/* <Return> */
/* A type-less pointer to the table. This will be 0 in case of */
/* error, or if the corresponding table was not found *OR* loaded */
/* from the file. */
/* */
/* <Note> */
/* The table is owned by the face object, and disappears with it. */
/* */
/* This function is only useful to access SFNT tables that are loaded */
/* by the sfnt/truetype/opentype drivers. See the FT_Sfnt_Tag */
/* enumeration in `tttables.h' for a list. */
/* */
/* You can load any table with a different function.. XXX */
/* */
FT_EXPORT_FUNC( void* ) FT_Get_Sfnt_Table( FT_Face face,
FT_Sfnt_Tag tag )
{
void* table = 0;
FT_Get_Sfnt_Table_Func func;
FT_Driver driver;
if ( !face || !FT_IS_SFNT( face ) )
goto Exit;
driver = face->driver;
func = (FT_Get_Sfnt_Table_Func)driver->root.clazz->get_interface(
FT_MODULE( driver ), "get_sfnt" );
if ( func )
table = func( face, tag );
Exit:
return table;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** R E N D E R E R S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* lookup a renderer by glyph format in the library's list */
static FT_Renderer ft_lookup_renderer( FT_Library library,
FT_Glyph_Format format,
FT_ListNode* node )
{
FT_ListNode cur = library->renderers.head;
FT_Renderer result = 0;
if ( node )
*node = 0;
while ( cur )
{
FT_Renderer renderer = FT_RENDERER( cur->data );
if ( renderer->glyph_format == format )
{
if ( node )
*node = cur;
result = renderer;
break;
}
}
return result;
}
static FT_Renderer ft_lookup_glyph_renderer( FT_GlyphSlot slot )
{
FT_Face face = slot->face;
FT_Library library = FT_FACE_LIBRARY( face );
FT_Renderer result = library->cur_renderer;
if ( !result || result->glyph_format != slot->format )
result = ft_lookup_renderer( library, slot->format, 0 );
return result;
}
static void ft_set_current_renderer( FT_Library library )
{
FT_Renderer renderer;
renderer = ft_lookup_renderer( library, ft_glyph_format_outline, 0 );
library->cur_renderer = renderer;
}
static FT_Error ft_add_renderer( FT_Module module )
{
FT_Library library = module->library;
FT_Memory memory = library->memory;
FT_Error error;
FT_ListNode node;
if ( ALLOC( node, sizeof ( *node ) ) )
goto Exit;
{
FT_Renderer render = FT_RENDERER( module );
FT_Renderer_Class* clazz = (FT_Renderer_Class*)module->clazz;
render->clazz = clazz;
render->glyph_format = clazz->glyph_format;
/* allocate raster object if needed */
if ( clazz->glyph_format == ft_glyph_format_outline &&
clazz->raster_class->raster_new )
{
error = clazz->raster_class->raster_new( memory, &render->raster );
if ( error )
goto Fail;
render->raster_render = clazz->raster_class->raster_render;
render->render = clazz->render_glyph;
}
/* add to list */
node->data = module;
FT_List_Add( &library->renderers, node );
ft_set_current_renderer( library );
}
Fail:
if ( error )
FREE( node );
Exit:
return error;
}
static void ft_remove_renderer( FT_Module module )
{
FT_Library library = module->library;
FT_Memory memory = library->memory;
FT_ListNode node;
node = FT_List_Find( &library->renderers, module );
if ( node )
{
FT_Renderer render = FT_RENDERER( module );
/* release raster object, if any */
if ( render->raster )
render->clazz->raster_class->raster_done( render->raster );
/* remove from list */
FT_List_Remove( &library->renderers, node );
FREE( node );
ft_set_current_renderer( library );
}
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Renderer */
/* */
/* <Description> */
/* Retrieves the current renderer for a given glyph format. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* format :: The glyph format. */
/* */
/* <Return> */
/* A renderer handle. 0 if none found. */
/* */
/* <Note> */
/* An error will be returned if a module already exists by that name, */
/* or if the module requires a version of FreeType that is too great. */
/* */
/* To add a new renderer, simply use FT_Add_Module(). To retrieve a */
/* renderer by its name, use FT_Get_Module(). */
/*
FT_EXPORT_FUNC( FT_Renderer ) FT_Get_Renderer( FT_Library library,
FT_Glyph_Format format )
{
return ft_lookup_renderer( library, format, 0 );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Renderer */
/* */
/* <Description> */
/* Sets the current renderer to use, and set additional mode. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* renderer :: A handle to the renderer object. */
/* */
/* num_params :: The number of additional parameters. */
/* */
/* params :: Additional parameters. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* In case of success, the renderer will be used to convert glyph */
/* images in the renderer's known format into bitmaps. */
/* */
/* This doesn't change the current renderer for other formats. */
/* */
FT_EXPORT_DEF( FT_Error ) FT_Set_Renderer( FT_Library library,
FT_Renderer renderer,
FT_UInt num_params,
FT_Parameter* parameters )
{
FT_ListNode node;
FT_Error error = FT_Err_Ok;
node = FT_List_Find( &library->renderers, renderer );
if ( !node )
{
error = FT_Err_Invalid_Argument;
goto Exit;
}
FT_List_Up( &library->renderers, node );
if ( renderer->glyph_format == ft_glyph_format_outline )
library->cur_renderer = renderer;
if ( num_params > 0 )
{
FTRenderer_setMode set_mode = renderer->clazz->set_mode;
for ( ; num_params > 0; num_params-- )
{
error = set_mode( renderer, parameters->tag, parameters->data );
if ( error )
break;
}
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Render_Glyph */
/* */
/* <Description> */
/* Converts a given glyph image to a bitmap. It does so by */
/* inspecting the glyph image format, find the relevant renderer, and */
/* invoke it. */
/* */
/* <Input> */
/* slot :: A handle to the glyph slot containing the image to */
/* convert. */
/* */
/* render_mode :: A set of bit flags indicating which kind of bitmap */
/* to render. For now, only */
/* `ft_render_mode_anti_alias' is supported by the */
/* available renderers, but others could appear later */
/* (e.g. optimized for TV or LCD). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* In case of success, the renderer will be used to convert glyph */
/* images in the renderer's known format into bitmaps. */
/* */
/* This doesn't change the current renderer for other formats. */
/* */
/* The slot's native image should be considered lost after the */
/* conversion. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Render_Glyph( FT_GlyphSlot slot,
FT_UInt render_mode )
{
FT_Error error = FT_Err_Ok;
FT_Renderer renderer;
if ( slot )
{
FT_Face face = slot->face;
FT_Library library = FT_FACE_LIBRARY( face );
/* if it is already a bitmap, no need to do anything */
switch ( slot->format )
{
case ft_glyph_format_bitmap: /* already a bitmap, don't do anything */
break;
default:
/* small shortcut for the very common case */
if ( slot->format == ft_glyph_format_outline )
renderer = library->cur_renderer;
else
renderer = ft_lookup_renderer( library, slot->format, 0 );
error = FT_Err_Unimplemented_Feature;
if ( renderer )
error = renderer->render( renderer, slot, render_mode );
}
}
else
error = FT_Err_Invalid_Argument;
return error;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M O D U L E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* Destroy_Module */
/* */
/* <Description> */
/* Destroys a given module object. For drivers, this also destroys */
/* all child faces. */
/* */
/* <InOut> */
/* module :: A handle to the target driver object. */
/* */
/* <Note> */
/* The driver _must_ be LOCKED! */
/* */
static
void Destroy_Module( FT_Module module )
{
FT_Memory memory = module->memory;
FT_Module_Class* clazz = module->clazz;
/* finalize client-data - before anything else */
if ( module->generic.finalizer )
module->generic.finalizer( module );
/* if the module is a renderer */
if ( FT_MODULE_IS_RENDERER( module ) )
ft_remove_renderer( module );
/* if the module is a font driver, add some steps */
if ( FT_MODULE_IS_DRIVER( module ) )
Destroy_Driver( FT_DRIVER( module ) );
/* finalize the module object */
if ( clazz->module_done )
clazz->module_done( module );
/* discard it */
FREE( module );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Add_Module */
/* */
/* <Description> */
/* Adds a new module to a given library instance. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* clazz :: A pointer to class descriptor for the module. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* An error will be returned if a module already exists by that name, */
/* or if the module requires a version of FreeType that is too great. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Add_Module( FT_Library library,
const FT_Module_Class* clazz )
{
FT_Error error;
FT_Memory memory;
FT_Module module;
FT_UInt nn;
#define FREETYPE_VER_FIXED ( ( (FT_Long)FREETYPE_MAJOR << 16 ) |
FREETYPE_MINOR )
if ( !library || !clazz )
return FT_Err_Invalid_Argument;
/* check freetype version */
if ( clazz->module_requires > FREETYPE_VER_FIXED )
return FT_Err_Invalid_Version;
/* look for a module with the same name in the library's table */
for ( nn = 0; nn < library->num_modules; nn++ )
{
module = library->modules[nn];
if ( strcmp( module->clazz->module_name, clazz->module_name ) == 0 )
{
/* this installed module has the same name, compare their versions */
if ( clazz->module_version <= module->clazz->module_version )
return FT_Err_Lower_Module_Version;
/* remove the module from our list, then exit the loop to replace */
/* it by our new version.. */
FT_Remove_Module( library, module );
break;
}
}
memory = library->memory;
error = FT_Err_Ok;
if ( library->num_modules >= FT_MAX_MODULES )
{
error = FT_Err_Too_Many_Drivers;
goto Exit;
}
/* allocate module object */
if ( ALLOC( module,clazz->module_size ) )
goto Exit;
/* base initialisation */
module->library = library;
module->memory = memory;
module->clazz = (FT_Module_Class*)clazz;
/* if the module is a renderer - this must be performed before */
/* the normal module initialization. */
if ( FT_MODULE_IS_RENDERER( module ) )
{
/* add to the renderers list */
error = ft_add_renderer( module );
if ( error )
goto Fail;
}
/* if the module is a font driver */
if ( FT_MODULE_IS_DRIVER( module ) )
{
/* allocate glyph loader if needed */
FT_Driver driver = FT_DRIVER( module );
driver->clazz = (FT_Driver_Class*)module->clazz;
if ( FT_DRIVER_USES_OUTLINES( driver ) )
{
error = FT_GlyphLoader_New( memory, &driver->glyph_loader );
if ( error )
goto Fail;
}
}
if ( clazz->module_init )
{
error = clazz->module_init( module );
if ( error )
goto Fail;
}
/* add module to the library's table */
library->modules[library->num_modules++] = module;
Exit:
return error;
Fail:
if ( FT_MODULE_IS_DRIVER( module ) )
{
FT_Driver driver = FT_DRIVER( module );
if ( FT_DRIVER_USES_OUTLINES( driver ) )
FT_GlyphLoader_Done( driver->glyph_loader );
}
if ( FT_MODULE_IS_RENDERER( module ) )
{
FT_Renderer renderer = FT_RENDERER( module );
if ( renderer->raster )
renderer->clazz->raster_class->raster_done( renderer->raster );
}
FREE( module );
goto Exit;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Module */
/* */
/* <Description> */
/* Finds a module by its name. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* module_name :: The module's name (as an ASCII string). */
/* */
/* <Return> */
/* A module handle. 0 if none was found. */
/* */
/* <Note> */
/* You should better be familiar with FreeType internals to know */
/* which module to look for :-) */
/* */
FT_EXPORT_FUNC( FT_Module ) FT_Get_Module( FT_Library library,
const char* module_name )
{
FT_Module result = 0;
FT_Module* cur = library->modules;
FT_Module* limit = cur + library->num_modules;
for ( ; cur < limit; cur++ )
if ( strcmp( cur[0]->clazz->module_name, module_name ) == 0 )
{
result = cur[0];
break;
}
return result;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Module_Interface */
/* */
/* <Description> */
/* Finds a module and returns its specific interface as a typeless */
/* pointer. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* module_name :: The module's name (as an ASCII string). */
/* */
/* <Return> */
/* A module-specific interface if available, 0 otherwise. */
/* */
/* <Note> */
/* You should better be familiar with FreeType internals to know */
/* which module to look for, and what its interface is :-) */
/* */
FT_EXPORT_FUNC(const void*) FT_Get_Module_Interface(
FT_Library library,
const char* mod_name )
{
FT_Module module;
module = FT_Get_Module( library, mod_name );
return module ? module->clazz->module_interface : 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Remove_Module */
/* */
/* <Description> */
/* Removes a given module from a library instance. */
/* */
/* <Input> */
/* library :: A handle to a library object. */
/* */
/* module :: A handle to a module object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The module object is destroyed by the function in case of success. */
/*
FT_EXPORT_FUNC( FT_Error ) FT_Remove_Module( FT_Library library,
FT_Module module )
{
/* try to find the module from the table, then remove it from there */
if ( library && module )
{
FT_Module* cur = library->modules;
FT_Module* limit = cur + library->num_modules;
for ( ; cur < limit; cur++ )
{
if (cur[0] == module)
{
/* remove it from the table */
library->num_modules--;
limit--;
while ( cur < limit )
{
cur[0] = cur[1];
cur++;
}
limit[0] = 0;
/* destroy the module */
Destroy_Module( module );
return FT_Err_Ok;
}
}
}
return FT_Err_Invalid_Handle;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** L I B R A R Y ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Library */
/* */
/* <Description> */
/* This function is used to create a new FreeType library instance */
/* from a given memory object. It is thus possible to use libraries */
/* with distinct memory allocators within the same program. */
/* */
/* <Input> */
/* memory :: A handle to the original memory object. */
/* */
/* <Output> */
/* alibrary :: A pointer to handle of a new library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Library( FT_Memory memory,
FT_Library* alibrary )
{
FT_Library library = 0;
FT_Error error;
if ( !memory )
return FT_Err_Invalid_Argument;
/* first of all, allocate the library object */
if ( ALLOC( library, sizeof ( *library ) ) )
return error;
library->memory = memory;
/* allocate the render pool */
library->raster_pool_size = FT_RENDER_POOL_SIZE;
if ( ALLOC( library->raster_pool, FT_RENDER_POOL_SIZE ) )
goto Fail;
/* That's ok now */
*alibrary = library;
return FT_Err_Ok;
Fail:
FREE( library );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Library */
/* */
/* <Description> */
/* Discards a given library object. This closes all drivers and */
/* discards all resource objects. */
/* */
/* <Input> */
/* library :: A handle to the target library. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Library( FT_Library library )
{
FT_Memory memory;
FT_Int n;
if ( !library )
return FT_Err_Invalid_Library_Handle;
memory = library->memory;
/* Discard client-data */
if ( library->generic.finalizer )
library->generic.finalizer( library );
/* Close all modules in the library */
for ( n = 0; n < library->num_modules; n++ )
{
FT_Module module = library->modules[n];
if ( module )
{
Destroy_Module( module );
library->modules[n] = 0;
}
}
/* Destroy raster objects */
FREE( library->raster_pool );
library->raster_pool_size = 0;
FREE( library );
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Debug_Hook */
/* */
/* <Description> */
/* Sets a debug hook function for debugging the interpreter of a font */
/* format. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* hook_index :: The index of the debug hook. You should use the */
/* values defined in ftobjs.h, e.g. */
/* FT_DEBUG_HOOK_TRUETYPE */
/* */
/* debug_hook :: The function used to debug the interpreter. */
/* */
/* <Note> */
/* Currently, four debug hook slots are available, but only two (for */
/* the TrueType and the Type 1 interpreter) are defined. */
/* */
FT_EXPORT_FUNC( void ) FT_Set_Debug_Hook( FT_Library library,
FT_UInt hook_index,
FT_DebugHook_Func debug_hook )
{
if ( library && debug_hook &&
hook_index <
( sizeof ( library->debug_hooks ) / sizeof ( void* ) ) )
library->debug_hooks[hook_index] = debug_hook;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_FreeType */
/* */
/* <Description> */
/* Destroys a given FreeType library object and all of its childs, */
/* including resources, drivers, faces, sizes, etc. */
/* */
/* <Input> */
/* library :: A handle to the target library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_FreeType( FT_Library library )
{
/* test for valid `library' delayed to FT_Done_Library() */
/* Discard the library object */
FT_Done_Library( library );
return FT_Err_Ok;
}
/* END */
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