| /**************************************************************************** |
| * |
| * ttcpal.c |
| * |
| * TrueType and OpenType color palette support (body). |
| * |
| * Copyright (C) 2018-2020 by |
| * David Turner, Robert Wilhelm, and Werner Lemberg. |
| * |
| * Originally written by Shao Yu Zhang <shaozhang@fb.com>. |
| * |
| * 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. |
| * |
| */ |
| |
| |
| /************************************************************************** |
| * |
| * `CPAL' table specification: |
| * |
| * https://www.microsoft.com/typography/otspec/cpal.htm |
| * |
| */ |
| |
| |
| #include <freetype/internal/ftdebug.h> |
| #include <freetype/internal/ftstream.h> |
| #include <freetype/tttags.h> |
| #include <freetype/ftcolor.h> |
| |
| |
| #ifdef TT_CONFIG_OPTION_COLOR_LAYERS |
| |
| #include "ttcpal.h" |
| |
| |
| /* NOTE: These are the table sizes calculated through the specs. */ |
| #define CPAL_V0_HEADER_BASE_SIZE 12 |
| #define COLOR_SIZE 4 |
| |
| |
| /* all data from `CPAL' not covered in FT_Palette_Data */ |
| typedef struct Cpal_ |
| { |
| FT_UShort version; /* Table version number (0 or 1 supported). */ |
| FT_UShort num_colors; /* Total number of color records, */ |
| /* combined for all palettes. */ |
| FT_Byte* colors; /* RGBA array of colors */ |
| FT_Byte* color_indices; /* Index of each palette's first color record */ |
| /* in the combined color record array. */ |
| |
| /* The memory which backs up the `CPAL' table. */ |
| void* table; |
| FT_ULong table_size; |
| |
| } Cpal; |
| |
| |
| /************************************************************************** |
| * |
| * 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 ttcpal |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_load_cpal( TT_Face face, |
| FT_Stream stream ) |
| { |
| FT_Error error; |
| FT_Memory memory = face->root.memory; |
| |
| FT_Byte* table = NULL; |
| FT_Byte* p = NULL; |
| |
| Cpal* cpal = NULL; |
| |
| FT_ULong colors_offset; |
| FT_ULong table_size; |
| |
| |
| error = face->goto_table( face, TTAG_CPAL, stream, &table_size ); |
| if ( error ) |
| goto NoCpal; |
| |
| if ( table_size < CPAL_V0_HEADER_BASE_SIZE ) |
| goto InvalidTable; |
| |
| if ( FT_FRAME_EXTRACT( table_size, table ) ) |
| goto NoCpal; |
| |
| p = table; |
| |
| if ( FT_NEW( cpal ) ) |
| goto NoCpal; |
| |
| cpal->version = FT_NEXT_USHORT( p ); |
| if ( cpal->version > 1 ) |
| goto InvalidTable; |
| |
| face->palette_data.num_palette_entries = FT_NEXT_USHORT( p ); |
| face->palette_data.num_palettes = FT_NEXT_USHORT( p ); |
| |
| cpal->num_colors = FT_NEXT_USHORT( p ); |
| colors_offset = FT_NEXT_ULONG( p ); |
| |
| if ( CPAL_V0_HEADER_BASE_SIZE + |
| face->palette_data.num_palettes * 2U > table_size ) |
| goto InvalidTable; |
| |
| if ( colors_offset >= table_size ) |
| goto InvalidTable; |
| if ( cpal->num_colors * COLOR_SIZE > table_size - colors_offset ) |
| goto InvalidTable; |
| |
| if ( face->palette_data.num_palette_entries > cpal->num_colors ) |
| goto InvalidTable; |
| |
| cpal->color_indices = p; |
| cpal->colors = (FT_Byte*)( table + colors_offset ); |
| |
| if ( cpal->version == 1 ) |
| { |
| FT_ULong type_offset, label_offset, entry_label_offset; |
| FT_UShort* array = NULL; |
| FT_UShort* limit; |
| FT_UShort* q; |
| |
| |
| if ( CPAL_V0_HEADER_BASE_SIZE + |
| face->palette_data.num_palettes * 2U + |
| 3U * 4 > table_size ) |
| goto InvalidTable; |
| |
| p += face->palette_data.num_palettes * 2; |
| |
| type_offset = FT_NEXT_ULONG( p ); |
| label_offset = FT_NEXT_ULONG( p ); |
| entry_label_offset = FT_NEXT_ULONG( p ); |
| |
| if ( type_offset ) |
| { |
| if ( type_offset >= table_size ) |
| goto InvalidTable; |
| if ( face->palette_data.num_palettes * 2 > |
| table_size - type_offset ) |
| goto InvalidTable; |
| |
| if ( FT_QNEW_ARRAY( array, face->palette_data.num_palettes ) ) |
| goto NoCpal; |
| |
| p = table + type_offset; |
| q = array; |
| limit = q + face->palette_data.num_palettes; |
| |
| while ( q < limit ) |
| *q++ = FT_NEXT_USHORT( p ); |
| |
| face->palette_data.palette_flags = array; |
| } |
| |
| if ( label_offset ) |
| { |
| if ( label_offset >= table_size ) |
| goto InvalidTable; |
| if ( face->palette_data.num_palettes * 2 > |
| table_size - label_offset ) |
| goto InvalidTable; |
| |
| if ( FT_QNEW_ARRAY( array, face->palette_data.num_palettes ) ) |
| goto NoCpal; |
| |
| p = table + label_offset; |
| q = array; |
| limit = q + face->palette_data.num_palettes; |
| |
| while ( q < limit ) |
| *q++ = FT_NEXT_USHORT( p ); |
| |
| face->palette_data.palette_name_ids = array; |
| } |
| |
| if ( entry_label_offset ) |
| { |
| if ( entry_label_offset >= table_size ) |
| goto InvalidTable; |
| if ( face->palette_data.num_palette_entries * 2 > |
| table_size - entry_label_offset ) |
| goto InvalidTable; |
| |
| if ( FT_QNEW_ARRAY( array, face->palette_data.num_palette_entries ) ) |
| goto NoCpal; |
| |
| p = table + entry_label_offset; |
| q = array; |
| limit = q + face->palette_data.num_palette_entries; |
| |
| while ( q < limit ) |
| *q++ = FT_NEXT_USHORT( p ); |
| |
| face->palette_data.palette_entry_name_ids = array; |
| } |
| } |
| |
| cpal->table = table; |
| cpal->table_size = table_size; |
| |
| face->cpal = cpal; |
| |
| /* set up default palette */ |
| if ( FT_NEW_ARRAY( face->palette, |
| face->palette_data.num_palette_entries ) ) |
| goto NoCpal; |
| |
| if ( tt_face_palette_set( face, 0 ) ) |
| goto InvalidTable; |
| |
| return FT_Err_Ok; |
| |
| InvalidTable: |
| error = FT_THROW( Invalid_Table ); |
| |
| NoCpal: |
| FT_FRAME_RELEASE( table ); |
| FT_FREE( cpal ); |
| |
| face->cpal = NULL; |
| |
| /* arrays in `face->palette_data' and `face->palette' */ |
| /* are freed in `sfnt_done_face' */ |
| |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| tt_face_free_cpal( TT_Face face ) |
| { |
| FT_Stream stream = face->root.stream; |
| FT_Memory memory = face->root.memory; |
| |
| Cpal* cpal = (Cpal*)face->cpal; |
| |
| |
| if ( cpal ) |
| { |
| FT_FRAME_RELEASE( cpal->table ); |
| FT_FREE( cpal ); |
| } |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| tt_face_palette_set( TT_Face face, |
| FT_UInt palette_index ) |
| { |
| Cpal* cpal = (Cpal*)face->cpal; |
| |
| FT_Byte* offset; |
| FT_Byte* p; |
| |
| FT_Color* q; |
| FT_Color* limit; |
| |
| FT_UShort color_index; |
| |
| |
| if ( !cpal || palette_index >= face->palette_data.num_palettes ) |
| return FT_THROW( Invalid_Argument ); |
| |
| offset = cpal->color_indices + 2 * palette_index; |
| color_index = FT_PEEK_USHORT( offset ); |
| |
| if ( color_index + face->palette_data.num_palette_entries > |
| cpal->num_colors ) |
| return FT_THROW( Invalid_Table ); |
| |
| p = cpal->colors + COLOR_SIZE * color_index; |
| q = face->palette; |
| limit = q + face->palette_data.num_palette_entries; |
| |
| while ( q < limit ) |
| { |
| q->blue = FT_NEXT_BYTE( p ); |
| q->green = FT_NEXT_BYTE( p ); |
| q->red = FT_NEXT_BYTE( p ); |
| q->alpha = FT_NEXT_BYTE( p ); |
| |
| q++; |
| } |
| |
| return FT_Err_Ok; |
| } |
| |
| |
| #else /* !TT_CONFIG_OPTION_COLOR_LAYERS */ |
| |
| /* ANSI C doesn't like empty source files */ |
| typedef int _tt_cpal_dummy; |
| |
| #endif /* !TT_CONFIG_OPTION_COLOR_LAYERS */ |
| |
| /* EOF */ |
