kc3-lang/freetype/src/base/ftobjs.c
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Hash : d1b7475b
Author :
Date : 2000-08-24T16:29:15
Formatting, small fixes. Adding basic input parameter checking for exported functions.
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src/base/ftobjs.c
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/***************************************************************************/ /* */ /* ftobjs.c */ /* */ /* The FreeType private base classes (body). */ /* */ /* 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 ) { /* in this case, we do not need to allocate a new stream object */ /* since the caller is responsible for closing it himself */ FREE( stream ); stream = args->stream; } 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 ); stream->close = 0; } } static void ft_done_stream( FT_Stream* astream, FT_Int external ) { FT_Stream stream = *astream; if ( stream->close ) stream->close( stream ); if ( !external ) { FT_Memory memory = stream->memory; 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; slot->library = driver->root.library; 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 ) { /* free bitmap if needed */ if ( slot->flags & ft_glyph_own_bitmap ) { FT_Memory memory = FT_FACE_MEMORY( slot->face ); FREE( slot->bitmap.buffer ); slot->flags &= ~ft_glyph_own_bitmap; } /* 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 = ft_glyph_format_none; 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; if ( !face || !aslot || !face->driver ) return FT_Err_Invalid_Argument; *aslot = 0; 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; } } } /*************************************************************************/ /* */ /* <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 after */ /* the glyph has been loaded. It means that hinting is unaltered by */ /* the transformation and is performed on the character size given in */ /* the last call to FT_Set_Char_Sizes() or FT_Set_Pixel_Sizes(). */ /* */ 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 = 0; face->transform_matrix.yx = 0; 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; } static FT_Renderer ft_lookup_glyph_renderer( FT_GlyphSlot slot ); /*************************************************************************/ /* */ /* <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; FT_Library library; FT_Bool autohint; FT_Module hinter; if ( !face || !face->size || !face->glyph ) return FT_Err_Invalid_Face_Handle; if ( glyph_index >= (FT_UInt)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; /* do we need to load the glyph through the auto-hinter? */ library = driver->root.library; hinter = library->auto_hinter; autohint = hinter && !( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) && FT_DRIVER_IS_SCALABLE(driver) && FT_DRIVER_USES_OUTLINES(driver); if ( autohint ) { if ( FT_DRIVER_HAS_HINTER( driver ) && !( load_flags & FT_LOAD_FORCE_AUTOHINT ) ) autohint = 0; } if ( autohint ) { FT_AutoHinter_Interface* hinting; hinting = (FT_AutoHinter_Interface*)hinter->clazz->module_interface; error = hinting->load_glyph( (FT_AutoHinter)hinter, slot, face->size, glyph_index, load_flags ); } else 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; } if ( ( load_flags & FT_LOAD_NO_RECURSE ) == 0 ) { /* now, transform the glyph image if 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 ); } /* do we need to render the image now? */ if ( !error && slot->format != ft_glyph_format_bitmap && slot->format != ft_glyph_format_composite && load_flags & FT_LOAD_RENDER ) { error = FT_Render_Glyph( slot, ( load_flags & FT_LOAD_MONOCHROME ) ? ft_render_mode_mono : ft_render_mode_normal ); } } 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 FT_Load_Glyph( face, glyph_index, load_flags ); } /* 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 auto-hinting data */ if ( face->autohint.finalizer ) face->autohint.finalizer( face->autohint.data ); /* 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 */ ft_done_stream( &face->stream, ( face->face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) != 0 ); /* 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 ); /* check whether 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; } /* there's a Mac-specific extended implementation of FT_New_Face() */ /* in src/mac/ftmac.c */ #ifndef macintosh /*************************************************************************/ /* */ /* <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 ); } #endif /* !macintosh */ /*************************************************************************/ /* */ /* <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, FT_Byte* 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; FT_Bool external_stream; /* test for valid `library' and `args' delayed to */ /* ft_new_input_stream() */ if ( !aface ) return FT_Err_Invalid_Argument; *aface = 0; external_stream = ( ( args->flags & ft_open_stream ) && args->stream ); /* 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 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, external_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, external_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 FT_FACE_FLAG_EXTERNAL_STREAM bit for FT_Done_Face */ if ( external_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 */ ft_done_stream( &stream, (FT_Bool)( parameters->stream && ( parameters->flags & ft_open_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; if ( !face ) return FT_Err_Invalid_Face_Handle; if ( !asize ) return FT_Err_Invalid_Size_Handle; if ( !face->driver ) return FT_Err_Invalid_Driver_Handle; *asize = 0; 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. */ /* */ /* kern_mode :: See FT_Kerning_Mode() for more information. */ /* Determines the scale/dimension of the returned */ /* kerning vector. */ /* */ /* <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_UInt kern_mode, 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; kerning->x = 0; kerning->y = 0; if ( driver->clazz->get_kerning ) { error = driver->clazz->get_kerning( face, left_glyph, right_glyph, kerning ); if ( !error ) { if ( kern_mode != ft_kerning_unscaled ) { kerning->x = FT_MulFix( kerning->x, face->size->metrics.x_scale ); kerning->y = FT_MulFix( kerning->y, face->size->metrics.y_scale ); if ( kern_mode != ft_kerning_unfitted ) { kerning->x = ( kerning->x + 32 ) & -64; kerning->y = ( kerning->y + 32 ) & -64; } } } } 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 if 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_Glyph_Name */ /* */ /* <Description> */ /* Retrieves the ASCII name of a given glyph in a face. This only */ /* works for those faces where FT_HAS_GLYPH_NAME(face) returns true. */ /* */ /* <Input> */ /* face :: A handle to a source face object. */ /* */ /* glyph_index :: The glyph index. */ /* */ /* buffer :: A pointer to a target buffer where the name will be */ /* copied to. */ /* */ /* buffer_max :: The maximal number of bytes available in the */ /* buffer. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* An error is returned if the face doesn't provide glyph names or if */ /* the glyph index is invalid. In all cases of failure, the first */ /* byte of `buffer' will be set to 0 to indicate an empty name. */ /* */ /* The glyph name is truncated to fit within the buffer if it is too */ /* long. The returned string is always zero-terminated. */ /* */ /* This function is not compiled within the library if the config */ /* macro FT_CONFIG_OPTION_NO_GLYPH_NAMES is defined in */ /* `include/freetype/config/ftoptions.h' */ /* */ FT_EXPORT_FUNC( FT_Error ) FT_Get_Glyph_Name( FT_Face face, FT_UInt glyph_index, FT_Pointer buffer, FT_UInt buffer_max ) { FT_Error error = FT_Err_Invalid_Argument; /* clean up buffer */ if ( buffer && buffer_max > 0 ) ((FT_Byte*)buffer)[0] = 0; if ( face && glyph_index < (FT_UInt)face->num_glyphs && FT_HAS_GLYPH_NAMES( face ) ) { /* now, lookup for glyph name */ FT_Driver driver = face->driver; FT_Module_Class* clazz = FT_MODULE_CLASS( driver ); if ( clazz->get_interface ) { FT_Glyph_Name_Requester requester; requester = (FT_Glyph_Name_Requester)clazz->get_interface( FT_MODULE( driver ), "glyph_name" ); if ( requester ) error = requester( face, glyph_index, buffer, buffer_max ); } } return error; } /*************************************************************************/ /* */ /* <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 */ BASE_FUNC( FT_Renderer ) FT_Lookup_Renderer( FT_Library library, FT_Glyph_Format format, FT_ListNode* node ) { FT_ListNode cur; FT_Renderer result = 0; if ( !library ) goto Exit; cur = library->renderers.head; if ( node ) { if ( *node ) cur = (*node)->next; *node = 0; } while ( cur ) { FT_Renderer renderer = FT_RENDERER( cur->data ); if ( renderer->glyph_format == format ) { if ( node ) *node = cur; result = renderer; break; } cur = cur->next; } Exit: 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 ) { /* test for valid `library' delayed to FT_Lookup_Renderer() */ 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. */ /* */ /* parameters :: 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; if ( !library ) return FT_Err_Invalid_Library_Handle; if ( !renderer ) return FT_Err_Invalid_Argument; 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; } LOCAL_FUNC FT_Error FT_Render_Glyph_Internal( FT_Library library, FT_GlyphSlot slot, FT_UInt render_mode ) { FT_Error error = FT_Err_Ok; FT_Renderer renderer; /* 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: { FT_ListNode node = 0; FT_Bool update = 0; /* small shortcut for the very common case */ if ( slot->format == ft_glyph_format_outline ) { renderer = library->cur_renderer; node = library->renderers.head; } else renderer = FT_Lookup_Renderer( library, slot->format, &node ); error = FT_Err_Unimplemented_Feature; while ( renderer ) { error = renderer->render( renderer, slot, render_mode, 0 ); if ( !error || error != FT_Err_Cannot_Render_Glyph ) break; /* FT_Err_Cannot_Render_Glyph is returned if the render mode */ /* is unsupported by the current renderer for this glyph image */ /* format. */ /* now, look for another renderer that supports the same */ /* format. */ renderer = FT_Lookup_Renderer( library, slot->format, &node ); update = 1; } /* if we changed the current renderer for the glyph image format */ /* we need to select it as the next current one */ if ( !error && update && renderer ) FT_Set_Renderer( library, renderer, 0, 0 ); } } 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 :: This is the render mode used to render the glyph */ /* image into a bitmap. See FT_Render_Mode for a list */ /* of possible values. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT_FUNC( FT_Error ) FT_Render_Glyph( FT_GlyphSlot slot, FT_UInt render_mode ) { FT_Library library; if ( !slot ) return FT_Err_Invalid_Argument; library = FT_FACE_LIBRARY( slot->face ); return FT_Render_Glyph_Internal( library, slot, render_mode ); } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** 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; FT_Library library = module->library; /* finalize client-data - before anything else */ if ( module->generic.finalizer ) module->generic.finalizer( module ); if ( library && library->auto_hinter == module ) library->auto_hinter = 0; /* 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 ) return FT_Err_Invalid_Library_Handle; if ( !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 initialization */ module->library = library; module->memory = memory; module->clazz = (FT_Module_Class*)clazz; /* check whether 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; } /* is the module a auto-hinter? */ if ( FT_MODULE_IS_HINTER( module ) ) library->auto_hinter = module; /* 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; FT_Module* limit; if ( !library || !module_name ) return result; cur = library->modules; 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 :-) */ /* */ BASE_FUNC( const void* ) FT_Get_Module_Interface( FT_Library library, const char* mod_name ) { FT_Module module; /* test for valid `library' delayed to FT_Get_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 ) return FT_Err_Invalid_Library_Handle; if ( 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_Driver_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_UInt 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; } /* END */