ref: b92479b8c246e5ed1757d6dff2b5687085e0e451
dir: /src/cache/ftcsbits.c/
/***************************************************************************/ /* */ /* ftcsbits.c */ /* */ /* FreeType sbits manager (body). */ /* */ /* Copyright 2000-2001 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 <ft2build.h> #include FT_CACHE_H #include FT_CACHE_SMALL_BITMAPS_H #include FT_CACHE_INTERNAL_CHUNK_H #include FT_INTERNAL_OBJECTS_H #include FT_INTERNAL_DEBUG_H #include FT_ERRORS_H #include "ftcerror.h" #include <string.h> /* memcmp() */ #define FTC_SBIT_ITEMS_PER_NODE 16 /* handle to sbit set */ typedef struct FTC_SBitSetRec_* FTC_SBitSet; /* sbit set structure */ typedef struct FTC_SBitSetRec_ { FTC_ChunkSetRec cset; FTC_Image_Desc desc; } FTC_SBitSetRec; #define FTC_SBIT_SET(x) ((FTC_SBitSet)(x)) #define FTC_SBIT_SET_MEMORY(x) FTC_CHUNK_SET_MEMORY(&(x)->cset) typedef struct FTC_SBitQueryRec_ { FTC_ChunkQueryRec chunk; FTC_Image_Desc desc; } FTC_SBitQueryRec, *FTC_SBitQuery; /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** SBIT CACHE NODES *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_CALLBACK_DEF( void ) ftc_sbit_node_done( FTC_ChunkNode cnode ) { FTC_ChunkSet cset = cnode->cset; FT_Memory memory = cset->ccache->cache.memory; FT_UInt count = cnode->item_count; FTC_SBit sbit = (FTC_SBit) cnode->items; if ( sbit ) { for ( ; count > 0; sbit++, count-- ) FREE( sbit->buffer ); FREE( cnode->items ); } ftc_chunk_node_done( cnode ); } static FT_Error ftc_sbit_set_bitmap( FTC_SBit sbit, FT_Bitmap* bitmap, FT_Memory memory ) { FT_Error error; FT_Int pitch = bitmap->pitch; FT_ULong size; if ( pitch < 0 ) pitch = -pitch; size = (FT_ULong)( pitch * bitmap->rows ); if ( !ALLOC( sbit->buffer, size ) ) MEM_Copy( sbit->buffer, bitmap->buffer, size ); return error; } static FT_Error ftc_sbit_node_load( FTC_ChunkNode cnode, FT_UInt gindex, FT_ULong *asize ) { FT_Error error; FTC_ChunkSet cset = cnode->cset; FTC_SBitSet sbitset = FTC_SBIT_SET(cset); FT_Memory memory = FTC_SBIT_SET_MEMORY(sbitset); FT_Face face; FT_Size size; FTC_SBit sbit; if ( gindex < (FT_UInt)cnode->item_start || gindex >= (FT_UInt)cnode->item_start + cnode->item_count ) { FT_ERROR(( "FreeType.cache.sbit_load: invalid glyph index" )); return FTC_Err_Invalid_Argument; } sbit = (FTC_SBit)cnode->items + (gindex - cnode->item_start); error = FTC_Manager_Lookup_Size( cset->ccache->cache.manager, &sbitset->desc.font, &face, &size ); if ( !error ) { FT_UInt load_flags = FT_LOAD_DEFAULT; FT_UInt image_type = sbitset->desc.image_type; /* determine load flags, depending on the font description's */ /* image type */ if ( FTC_IMAGE_FORMAT( image_type ) == ftc_image_format_bitmap ) { if ( image_type & ftc_image_flag_monochrome ) load_flags |= FT_LOAD_MONOCHROME; /* disable embedded bitmaps loading if necessary */ if ( image_type & ftc_image_flag_no_sbits ) load_flags |= FT_LOAD_NO_BITMAP; } else { FT_ERROR(( "FreeType.cache.sbit_load: cannot load scalable glyphs in an" " sbit cache, please check your arguments!\n" )); error = FTC_Err_Invalid_Argument; goto Exit; } /* always render glyphs to bitmaps */ load_flags |= FT_LOAD_RENDER; if ( image_type & ftc_image_flag_unhinted ) load_flags |= FT_LOAD_NO_HINTING; if ( image_type & ftc_image_flag_autohinted ) load_flags |= FT_LOAD_FORCE_AUTOHINT; /* by default, indicates a `missing' glyph */ sbit->buffer = 0; error = FT_Load_Glyph( face, gindex, load_flags ); if ( !error ) { FT_Int temp; FT_GlyphSlot slot = face->glyph; FT_Bitmap* bitmap = &slot->bitmap; FT_Int xadvance, yadvance; /* check that our values fit into 8-bit containers! */ /* If this is not the case, our bitmap is too large */ /* and we will leave it as `missing' with sbit.buffer = 0 */ #define CHECK_CHAR( d ) ( temp = (FT_Char)d, temp == d ) #define CHECK_BYTE( d ) ( temp = (FT_Byte)d, temp == d ) /* XXX: FIXME: add support for vertical layouts maybe */ /* horizontal advance in pixels */ xadvance = ( slot->metrics.horiAdvance + 32 ) >> 6; yadvance = ( slot->metrics.vertAdvance + 32 ) >> 6; if ( CHECK_BYTE( bitmap->rows ) && CHECK_BYTE( bitmap->width ) && CHECK_CHAR( bitmap->pitch ) && CHECK_CHAR( slot->bitmap_left ) && CHECK_CHAR( slot->bitmap_top ) && CHECK_CHAR( xadvance ) && CHECK_CHAR( yadvance ) ) { sbit->width = (FT_Byte) bitmap->width; sbit->height = (FT_Byte) bitmap->rows; sbit->pitch = (FT_Char) bitmap->pitch; sbit->left = (FT_Char) slot->bitmap_left; sbit->top = (FT_Char) slot->bitmap_top; sbit->xadvance = (FT_Char) xadvance; sbit->yadvance = (FT_Char) yadvance; sbit->format = (FT_Byte) bitmap->pixel_mode; /* grab the bitmap when possible - this is a hack !! */ if ( slot->flags & ft_glyph_own_bitmap ) { slot->flags &= ~ft_glyph_own_bitmap; sbit->buffer = bitmap->buffer; } else { /* copy the bitmap into a new buffer -- ignore error */ error = ftc_sbit_set_bitmap( sbit, bitmap, memory ); } /* now, compute size */ if ( asize ) *asize = ABS(sbit->pitch) * sbit->height; } /* glyph dimensions ok */ } /* glyph loading successful */ /* ignore the errors that might have occurred -- */ /* we recognize unloaded glyphs with `sbit.buffer == 0' */ /* and 'width == 255', 'height == 0' */ /* */ if ( error ) { sbit->width = 255; error = 0; /* sbit->buffer == NULL too !! */ } } Exit: return error; } FT_CALLBACK_DEF( FT_Error ) ftc_sbit_node_init( FTC_ChunkNode cnode, FTC_ChunkQuery query ) { FT_Error error; error = ftc_chunk_node_init( cnode, query->cset, query->gindex, TRUE ); if ( !error ) { error = ftc_sbit_node_load( cnode, query->gindex, NULL ); if ( error ) ftc_chunk_node_done( cnode ); } return error; } /* this function is important because it is both part of */ /* an FTC_ChunkSet_Class and an FTC_CacheNode_Class */ /* */ FT_CALLBACK_DEF( FT_ULong ) ftc_sbit_node_weight( FTC_ChunkNode cnode ) { FT_ULong size; FTC_ChunkSet cset = cnode->cset; FT_UInt count = cnode->item_count; FT_Int pitch; FTC_SBit sbit = (FTC_SBit) cnode->items; /* the node itself */ size = sizeof ( *cnode ); /* the sbit records */ size += cnode->item_count * sizeof ( FTC_SBitRec ); for ( ; count > 0; count--, sbit++ ) { if ( sbit->buffer ) { pitch = sbit->pitch; if ( pitch < 0 ) pitch = -pitch; /* add the size of a given glyph image */ size += pitch * sbit->height; } } return size; } FT_CALLBACK_DEF( FT_Bool ) ftc_sbit_node_compare( FTC_ChunkNode cnode, FTC_SBitQuery query, FTC_Cache cache ) { FTC_ChunkQuery creq = &query->chunk; FT_UInt gindex = query->chunk.gindex; FT_UInt offset = (FT_UInt)(gindex - cnode->item_start); FT_Bool result; result = FT_BOOL( offset < (FT_UInt)cnode->item_count && creq->cset == cnode->cset ); if ( result ) { /* check if we need to load the glyph bitmap now */ FTC_SBit sbit = (FTC_SBit)cnode->items + offset; if ( sbit->buffer == NULL && sbit->width != 255 ) { FT_ULong size; ftc_sbit_node_load( cnode, gindex, &size ); cache->manager->cur_weight += size; } } return result; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** SBIT CHUNK SETS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_CALLBACK_DEF( FT_Error ) ftc_sbit_set_init( FTC_SBitSet sset, FTC_SBitQuery query, FT_LruList lru ) { FTC_ChunkCache ccache = lru->user_data; FTC_Manager manager = ccache->cache.manager; FT_Error error; FT_Face face; sset->desc = query->desc; /* we need to compute "cquery.item_total" now */ error = FTC_Manager_Lookup_Face( manager, query->desc.font.face_id, &face ); if ( !error ) { ftc_chunk_set_init( FTC_CHUNK_SET(sset), sizeof( FTC_SBitRec ), FTC_SBIT_ITEMS_PER_NODE, face->num_glyphs, FTC_CHUNK_CACHE(lru->user_data) ); /* now compute hash from description - this is _very_ important */ /* for good performance.. */ sset->cset.hash = FTC_IMAGE_DESC_HASH( &sset->desc ); query->chunk.cset = &sset->cset; } return error; } FT_CALLBACK_DEF( FT_Bool ) ftc_sbit_set_compare( FTC_SBitSet sset, FTC_SBitQuery query ) { FT_Bool result; /* we need to set the "cquery.cset" field or our query for */ /* faster glyph comparisons in ftc_sbit_node_compare.. */ /* */ result = FT_BOOL( FTC_IMAGE_DESC_COMPARE( &sset->desc, &query->desc ) ); if ( result ) query->chunk.cset = &sset->cset; return result; } FT_CALLBACK_TABLE_DEF const FT_LruList_ClassRec ftc_sbit_set_class = { sizeof( FT_LruListRec ), (FT_LruList_InitFunc) NULL, (FT_LruList_DoneFunc) NULL, sizeof( FTC_SBitSetRec ), (FT_LruNode_InitFunc) ftc_sbit_set_init, (FT_LruNode_DoneFunc) ftc_chunk_set_done, (FT_LruNode_FlushFunc) NULL, (FT_LruNode_CompareFunc) ftc_sbit_set_compare, }; /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** SBITS CACHE *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_CALLBACK_DEF( FT_Error ) ftc_sbit_cache_init( FTC_SBit_Cache scache ) { return ftc_chunk_cache_init( FTC_CHUNK_CACHE(scache), &ftc_sbit_set_class ); } FT_CALLBACK_TABLE_DEF const FTC_Cache_ClassRec ftc_sbit_cache_class = { sizeof( FTC_ChunkCacheRec ), (FTC_Cache_InitFunc) ftc_sbit_cache_init, (FTC_Cache_DoneFunc) ftc_chunk_cache_done, sizeof( FTC_ChunkNodeRec ), (FTC_Node_InitFunc) ftc_sbit_node_init, (FTC_Node_WeightFunc) ftc_sbit_node_weight, (FTC_Node_CompareFunc) ftc_sbit_node_compare, (FTC_Node_DoneFunc) ftc_sbit_node_done }; /* documentation is in ftcsbits.h */ FT_EXPORT_DEF( FT_Error ) FTC_SBit_Cache_New( FTC_Manager manager, FTC_SBit_Cache *acache ) { return FTC_Manager_Register_Cache( manager, &ftc_sbit_cache_class, (FTC_Cache*) acache ); } /* documentation is in ftcsbits.h */ FT_EXPORT_DEF( FT_Error ) FTC_SBit_Cache_Lookup( FTC_SBit_Cache cache, FTC_Image_Desc* desc, FT_UInt gindex, FTC_SBit *ansbit ) { FT_Error error; FTC_ChunkCache ccache = (FTC_ChunkCache) cache; FTC_ChunkNode node; FTC_SBitQueryRec query; /* argument checks delayed to FTC_Chunk_Cache_Lookup */ if ( !ansbit ) return FTC_Err_Invalid_Argument; *ansbit = NULL; query.chunk.gindex = gindex; query.chunk.cset = NULL; query.desc = *desc; error = ftc_chunk_cache_lookup( ccache, &query.chunk, &node ); if ( !error ) { *ansbit = (FTC_SBit) node->items + (gindex - node->item_start); } return error; } /* END */