bytecode.h

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/*
 * This file is part of LibCSS.
 * Licensed under the MIT License,
 *                http://www.opensource.org/licenses/mit-license.php
 * Copyright 2008 John-Mark Bell <jmb@netsurf-browser.org>
 */
 
#ifndef css_bytecode_bytecode_h_
#define css_bytecode_bytecode_h_
 
#include <inttypes.h>
#include <stdio.h>
 
#include <libcss/types.h>
#include <libcss/properties.h>
 
typedef uint32_t css_code_t;
 
typedef enum css_properties_e opcode_t;
 
enum flag_value {
    FLAG_VALUE__NONE   = 0,
    FLAG_VALUE_INHERIT = 1,
    FLAG_VALUE_INITIAL = 2,
    FLAG_VALUE_REVERT  = 3,
    FLAG_VALUE_UNSET   = 4,
};
 
enum flag {
    FLAG_IMPORTANT = (1 << 0),
    FLAG_INHERIT   = (FLAG_VALUE_INHERIT << 1),
    FLAG_INITIAL   = (FLAG_VALUE_INITIAL << 1),
    FLAG_REVERT    = (FLAG_VALUE_REVERT  << 1),
    FLAG_UNSET     = (FLAG_VALUE_UNSET   << 1),
};
 
 
typedef enum unit {
    UNIT_LENGTH = (1u << 8),
    UNIT_PX   = (1u << 8) + 0,
    UNIT_EX   = (1u << 8) + 1,
    UNIT_EM   = (1u << 8) + 2,
    UNIT_IN   = (1u << 8) + 3,
    UNIT_CM   = (1u << 8) + 4,
    UNIT_MM   = (1u << 8) + 5,
    UNIT_PT   = (1u << 8) + 6,
    UNIT_PC   = (1u << 8) + 7,
    UNIT_CH   = (1u << 8) + 8,
    UNIT_REM  = (1u << 8) + 9,
    UNIT_LH   = (1u << 8) + 10,
    UNIT_VH   = (1u << 8) + 11,
    UNIT_VW   = (1u << 8) + 12,
    UNIT_VI   = (1u << 8) + 13,
    UNIT_VB   = (1u << 8) + 14,
    UNIT_VMIN = (1u << 8) + 15,
    UNIT_VMAX = (1u << 8) + 16,
    UNIT_Q    = (1u << 8) + 17,
 
    UNIT_PCT = (1 << 9),
 
    UNIT_ANGLE = (1 << 10),
    UNIT_DEG  = (1 << 10) + 0,
    UNIT_GRAD = (1 << 10) + 1,
    UNIT_RAD  = (1 << 10) + 2,
    UNIT_TURN = (1 << 10) + 3,
 
    UNIT_TIME = (1 << 11),
    UNIT_MS = (1 << 11) + 0,
    UNIT_S  = (1 << 11) + 1,
 
    UNIT_FREQ = (1 << 12),
    UNIT_HZ  = (1 << 12) + 0,
    UNIT_KHZ = (1 << 12) + 1,
 
    UNIT_RESOLUTION = (1 << 13),
    UNIT_DPI  = (1 << 13) + 0,
    UNIT_DPCM = (1 << 13) + 1,
    UNIT_DPPX = (1 << 13) + 2,
} unit;
 
typedef uint32_t colour;
 
typedef enum shape {
    SHAPE_RECT = 0
} shape;
 
static inline css_code_t buildOPV(opcode_t opcode, uint8_t flags, uint16_t value)
{
    return (opcode & 0x3ff) | (flags << 10) | ((value & 0x3fff) << 18);
}
 
static inline opcode_t getOpcode(css_code_t OPV)
{
    return (OPV & 0x3ff);
}
 
static inline uint8_t getFlags(css_code_t OPV)
{
    return ((OPV >> 10) & 0xff);
}
 
static inline uint16_t getValue(css_code_t OPV)
{
    return (OPV >> 18);
}
 
static inline bool isImportant(css_code_t OPV)
{
    return getFlags(OPV) & FLAG_IMPORTANT;
}
 
static inline enum flag_value getFlagValue(css_code_t OPV)
{
    return (getFlags(OPV) >> 1) & 0x7;
}
 
static inline bool hasFlagValue(css_code_t OPV)
{
    return getFlagValue(OPV) != FLAG_VALUE__NONE;
}
 
static inline bool isInherit(css_code_t OPV)
{
    return getFlagValue(OPV) == FLAG_VALUE_INHERIT;
}
 
#endif