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+/****************************************************************************
+ *
+ * ttcpal.c
+ *
+ * TrueType and OpenType color palette support (body).
+ *
+ * Copyright (C) 2018-2019 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 <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_COLOR_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 */