Parse TrueType instructions
This commit is contained in:
Patrick Walton
parent
d29775c345
commit
9c07c1a4a6
438
src/hinting.rs
438
src/hinting.rs
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// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(dead_code)]
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//! The TrueType hinting VM.
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//!
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//! See: https://www.microsoft.com/typography/otspec/ttinst.htm
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use byteorder::{BigEndian, ByteOrder};
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use error::HintingError;
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use euclid::Point2D;
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use font::Font;
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/// A TrueType hinting virtual machine.
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pub struct Hinter {
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// The Control Value Table: the VM's initialized memory.
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control_value_table: Vec<i16>,
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// The Storage Area: the VM's uninitialized memory.
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storage_area: Vec<u32>,
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// The projection vector, in 2.14 fixed point.
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projection_vector: Point2D<i16>,
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// The dual projection vector, in 2.14 fixed point.
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dual_projection_vector: Point2D<i16>,
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// The freedom vector, in 2.14 fixed point.
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freedom_vector: Point2D<i16>,
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// The reference point indices.
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reference_points: [u32; 3],
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// The zone numbers.
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zone_points: [u32; 3],
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// The round state.
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round_state: RoundState,
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// The loop variable count.
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loop_count: u32,
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// The minimum distance value.
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minimum_distance: u32,
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// Instruction control flags.
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instruction_control: InstructionControl,
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// Threshold value for ppem. See `SCANCTRL` (ttinst1.doc, 244-245).
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dropout_threshold: u8,
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// Special dropout control.
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dropout_control: DropoutControl,
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// The scan type. See `SCANTYPE` (ttinst1.doc, 246-247).
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scan_type: ScanType,
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// The control value cut in. See `SCVTSI` (ttinst1.doc, 249).
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control_value_cut_in: u32,
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// The single width cut in. See `SSWCI` (ttinst1.doc, 250).
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single_width_cut_in: u32,
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// The single width value. See `SSW` (ttinst1.doc, 251).
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single_width_value: i32,
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// The angle weight. Per spec, does nothing. See `SANGW` (ttinst1.doc, 254).
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angle_weight: u32,
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// The delta base. See `SDB` (ttinst1.doc, 255).
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delta_base: u32,
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// The delta shift. See `SDS` (ttinst1.doc, 256).
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delta_shift: u32,
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// Various graphics state flags.
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graphics_state_flags: GraphicsStateFlags,
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}
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impl Hinter {
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pub fn new(font: &Font) -> Result<Hinter, HintingError> {
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let cvt = font.control_value_table().chunks(2).map(BigEndian::read_i16).collect();
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let hinter = Hinter {
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control_value_table: cvt,
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storage_area: vec![],
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projection_vector: Point2D::zero(),
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dual_projection_vector: Point2D::zero(),
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freedom_vector: Point2D::zero(),
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reference_points: [0; 3],
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zone_points: [0; 3],
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round_state: RoundState::RoundToHalfGrid,
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loop_count: 0,
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minimum_distance: 0,
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instruction_control: InstructionControl::empty(),
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dropout_threshold: 0,
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dropout_control: DropoutControl::empty(),
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scan_type: ScanType::SimpleDropoutControlIncludingStubs,
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control_value_cut_in: 0,
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single_width_cut_in: 0,
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single_width_value: 0,
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angle_weight: 0,
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delta_base: 0,
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delta_shift: 0,
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graphics_state_flags: AUTO_FLIP,
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};
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Ok(hinter)
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}
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}
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// All TrueType instructions.
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#[derive(Clone, Copy, Debug)]
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enum Instruction<'a> {
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// Push N Bytes (0x40) (ttinst1.doc, p. 189)
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Npushb(&'a [u8]),
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// Push N Words (0x41) (ttinst1.doc, p. 190)
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Npushw(&'a [u8]),
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// Push Bytes (0xb0-0xb7) (ttinst1.doc, p. 191)
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Pushb(u8, &'a [u8]),
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// Push Words (0xb8-0xbf) (ttinst1.doc, p. 192)
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Pushw(u8, &'a [u8]),
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// Read Store (0x43) (ttinst1.doc, p. 194)
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Rs,
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// Write Store (0x42) (ttinst1.doc, p. 195)
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Ws,
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// Write Control Value Table in Pixel Units (0x44) (ttinst1.doc, 197)
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Wcvtp,
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// Write Control Value Table in FUints (0x70) (ttinst1.doc, 198)
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Wcvtf,
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// Read Control Value Table (0x45) (ttinst1.doc, 199)
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Rcvt,
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// Set Freedom and Projection Vectors to Coordinate Axis (0x00-0x01) (ttinst1.doc, 202)
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Svtca(Axis),
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// Set Projection Vector to Coordinate Axis (0x02-0x03) (ttinst1.doc, 203)
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Spvtca(Axis),
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// Set Freedom Vector to Coordinate Axis (0x04-0x05) (ttinst1.doc, 204)
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Sfvtca(Axis),
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// Set Projection Vector to Line (0x06-0x07) (ttinst1.doc, 205-207)
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Spvtl(LineOrientation),
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// Set Freedom Vector to Line (0x08-0x09) (ttinst1.doc, 208-209)
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Sfvtl(LineOrientation),
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// Set Freedom Vector to Projection Vector (0x0e) (ttinst1.doc, 210)
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Sfvtpv,
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// Set Dual Projection Vector to Line (0x86-0x87) (ttinst1.doc, 211)
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Sdpvtl(LineOrientation),
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// Set Projection Vector From Stack (0x0a) (ttinst1.doc, 212-213)
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Spvfs,
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// Set Freedom Vector From Stack (0x0b) (ttinst1.doc, 214-215)
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Sfvfs,
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// Get Projection Vector (0x0c) (ttinst1.doc, 216-217)
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Gpv,
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// Get Freedom Vector (0x0d) (ttinst1.doc, 218-219)
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Gfv,
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// Set Reference Point 0 (0x10) (ttinst1.doc, 220)
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Srp0,
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// Set Reference Point 1 (0x11) (ttinst1.doc, 221)
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Srp1,
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// Set Reference Point 2 (0x12) (ttinst1.doc, 222)
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Srp2,
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// Set Zone Pointer 0 (0x13) (ttinst1.doc, 223)
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Szp0,
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// Set Zone Pointer 1 (0x14) (ttinst1.doc, 224)
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Szp1,
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// Set Zone Pointer 2 (0x15) (ttinst1.doc, 225)
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Szp2,
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// Set Zone Pointers (0x16) (ttinst1.doc, 226)
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Szps,
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// Round to Half Grid (0x19) (ttinst1.doc, 227)
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Rthg,
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// Round to Grid (0x18) (ttinst1.doc, 228)
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Rtg,
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// Round to Double Grid (0x3d) (ttinst1.doc, 229)
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Rtdg,
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// Round Down to Grid (0x7d) (ttinst1.doc, 230)
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Rdtg,
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// Round Up to Grid (0x7c) (ttinst1.doc, 231)
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Rutg,
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// Round Off (0x7a) (ttinst1.doc, 232)
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Roff,
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// Super Round (0x76) (ttinst1.doc, 233-238)
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Sround,
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// Super Round 45 Degrees (0x77) (ttinst1.doc, 239)
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S45round,
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// Set Loop Variable (0x17) (ttinst1.doc, 240)
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Sloop,
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// Set Minimum Distance (0x1a) (ttinst1.doc, 241)
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Smd,
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// Instruction Execution Control (0x8e) (ttinst1.doc, 242-243)
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Instctrl,
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// Scan Conversion Control (0x85) (ttinst1.doc, 244-245)
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Scanctrl,
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// Set Control Value Table Cut In (0x1d) (ttinst1.doc, 249)
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Scvtci,
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// Set Single Width Cut In (0x1e) (ttinst1.doc, 250)
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Sswci,
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// Set Single Width (0x1f) (ttinst1.doc, 251)
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Ssw,
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// Set Auto Flip Boolean to On (0x4d) (ttinst1.doc, 252)
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Flipon,
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// Set Auto Flip Boolean to Off (0x4e) (ttinst1.doc, 253)
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Flipoff,
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// Set Angle Weight (0x7e) (ttinst1.doc, 254)
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Sangw,
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// Set Delta Base (0x5e) (ttinst1.doc, 255)
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Sdb,
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// Set Delta Shift (0x5f) (ttinst1.doc, 256)
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Sds,
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// Get Coordinate (0x46-0x47) (ttinst1.doc, 258-259)
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Gc(WhichPosition),
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// Set Coordinate From Stack (0x48) (ttinst1.doc, 260)
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Scfs,
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// Measure Distance (0x49-0x4a) (ttinst1.doc, 261-262)
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Md(WhichPosition),
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// Measure Pixels Per Em (0x4b) (ttinst1.doc, 263)
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Mppem,
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// Measure Point Size (0x4c) (ttinst1.doc, 264)
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Mps,
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// Flip Point (0x80) (ttinst2.doc, 263)
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Flippt,
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// Flip Range On (0x81) (ttinst2.doc, 264)
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Fliprgon,
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// Flip Range Off (0x82) (ttinst2.doc, 265)
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Fliprgoff,
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// Shift Point by Last Point (0x32-0x33) (ttinst2.doc, 266)
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Shp(ZonePoint),
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// Shift Contour by Last Point (0x34-0x35) (ttinst2.doc, 267)
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Shc(ZonePoint),
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// Shift Zone by Last Point (0x36-0x37) (ttinst2.doc, 268)
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Shz(ZonePoint),
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// Shift Point by Pixel Amount (0x38) (ttinst2.doc, 269)
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Shpix,
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// Move Stack Indirect Relative Point (0x3a-0x3b) (ttinst2.doc, 270)
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Msirp(SetRP0),
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// Move Direct Absolute Point (0x2e-0x2f) (ttinst2.doc, 271)
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Mdap(ShouldRound),
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// Move Indirect Absolute Point (0x3e-0x3f) (ttinst2.doc, 272-275)
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Miap(ShouldRound),
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// Move Direct Relative Point (0xc0-0xdf) (ttinst2.doc, 276-283)
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Mdrp(SetRP0, ApplyMinimumDistance, ShouldRound, DistanceType),
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// Align Relative Point (0x3c) (ttinst2.doc, 284)
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Alignrp,
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// Move Point to Intersection of Two Lines (0x0f) (ttinst2.doc, 286-288)
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Isect,
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// Align Points (0x27) (ttinst2.doc, 289)
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Alignpts,
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// Interpolate Point by Last Relative Stretch (0x39) (ttinst2.doc, 290)
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Ip,
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// Untouch Point (0x29) (ttinst2.doc, 291)
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Utp,
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// Interpolate Untouched Points Through Outline (0x30-0x31) (ttinst2.doc, 292)
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Iup(Axis),
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// Delta Exception P1 (0x5d) (ttinst2.doc, 296)
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Deltap1,
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// Delta Exception P2 (0x71) (ttinst2.doc, 297)
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Deltap2,
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// Delta Exception P3 (0x72) (ttinst2.doc, 298)
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Deltap3,
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// Delta Exception C1 (0x73) (ttinst2.doc, 299)
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Deltac1,
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// Delta Exception C2 (0x74) (ttinst2.doc, 300)
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Deltac2,
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// Delta Exception C3 (0x75) (ttinst2.doc, 301)
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Deltac3,
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// Duplicate Top Stack Element (0x20) (ttinst2.doc, 304)
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Dup,
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// Pop Top Stack Element (0x21) (ttinst2.doc, 305)
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Pop,
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// Clear the Entire Stack (0x22) (ttinst2.doc, 306)
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Clear,
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// Swap the Top Two Elements on the Stack (0x23) (ttinst2.doc, 307)
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Swap,
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// Return the Depth of the Stack (0x24) (ttinst2.doc, 308)
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Depth,
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// Copy an Indexed Element to the Top of the Stack (0x25) (ttinst2.doc, 309)
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Cindex,
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// Move an Indexed Element to the Top of the Stack (0x26) (ttinst2.doc, 310)
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Mindex,
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// Roll the Top Three Stack Elements (0x8a) (ttinst2.doc, 311)
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Roll,
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// If Test (0x58) (ttinst2.doc, 313-314)
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If,
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// Else (0x1b) (ttinst2.doc, 315)
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Else,
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// End If (0x59) (ttinst2.doc, 316)
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EIf,
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// Jump Relative on True (0x78) (ttinst2.doc, 317-318)
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Jrot,
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// Jump (0x1c) (ttinst2.doc, 319)
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Jmpr,
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// Jump Relative on False (0x79) (ttinst2.doc, 320-321)
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Jrof,
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// Less Than (0x50) (ttinst2.doc, 323)
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Lt,
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// Less Than or Equal (0x51) (ttinst2.doc, 324)
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Lteq,
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// Greater Than (0x52) (ttinst2.doc, 325)
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Gt,
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// Greater Than or Equal (0x53) (ttinst2.doc, 326)
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Gteq,
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// Equal (0x54) (ttinst2.doc, 327)
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Eq,
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// Not Equal (0x55) (ttinst2.doc, 328)
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Neq,
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// Odd (0x56) (ttinst2.doc, 329)
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Odd,
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// Even (0x57) (ttinst2.doc, 330)
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Even,
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// Logical And (0x5a) (ttinst2.doc, 331-332)
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And,
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// Logical Or (0x5b) (ttinst2.doc, 333)
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Or,
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// Logical Not (0x5c) (ttinst2.doc, 334)
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Not,
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// Add (0x60) (ttinst2.doc, 336)
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Add,
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// Subtract (0x61) (ttinst2.doc, 337)
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Sub,
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// Divide (0x62) (ttinst2.doc, 338)
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Div,
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// Multiply (0x63) (ttinst2.doc, 339)
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Mul,
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// Absolute Value (0x64) (ttinst2.doc, 340)
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Abs,
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// Negate (0x65) (ttinst2.doc, 341)
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Neg,
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// Floor (0x66) (ttinst2.doc, 342)
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Floor,
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// Ceiling (0x67) (ttinst2.doc, 343)
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Ceiling,
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// Maximum of Top Two Stack Elements (0x8b) (ttinst2.doc, 344)
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Max,
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// Minimum of Top Two Stack Elements (0x8c) (ttinst2.doc, 345)
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Min,
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// Round Value (0x68-0x6b) (ttinst2.doc, 347)
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Round(DistanceType),
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// No Rounding of Value (0x6c-0x6f) (ttinst2.doc, 349)
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Nround(DistanceType),
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// Function Definition (0x2c) (ttinst2.doc, 351)
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Fdef,
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// End Function Definition (0x2d) (ttinst2.doc, 352)
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Endf,
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// Call Function (0x2b) (ttinst2.doc, 353)
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Call,
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// Loop and Call Function (0x2a) (ttinst2.doc, 354)
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Loopcall,
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// Instruction Definition (0x89) (ttinst2.doc, 355)
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Idef,
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// Debug Call (0x4f) (ttinst2.doc, 356)
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Debug,
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// Get Information (0x88) (ttinst2.doc, 357-360)
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Getinfo,
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// Get Variation (0x91) (ttinst2.doc, 361)
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Getvariation,
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}
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#[derive(Copy, Clone, Debug)]
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#[repr(u8)]
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enum Axis {
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Y = 0,
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X = 1,
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}
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#[derive(Copy, Clone, Debug)]
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#[repr(u8)]
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enum LineOrientation {
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Parallel = 0,
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Perpendicular = 1,
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}
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#[derive(Copy, Clone, Debug)]
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#[repr(u8)]
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enum RoundState {
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RoundToHalfGrid = 0,
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RoundToGrid = 1,
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RoundToDoubleGrid = 2,
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RoundDownToGrid = 3,
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RoundUpToGrid = 4,
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RoundOff = 5,
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}
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#[derive(Copy, Clone, Debug)]
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#[repr(u8)]
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enum WhichPosition {
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// Use the current position.
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Current = 0,
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// Use the position in the original outline.
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Original = 1,
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}
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bitflags! {
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flags InstructionControl: u8 {
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const INHIBIT_GRID_FITTING = 1 << 0,
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const IGNORE_CVT_PARAMETERS = 1 << 1,
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const NATIVE_SUBPIXEL_AA = 1 << 2,
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}
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}
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bitflags! {
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flags DropoutControl: u8 {
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const DROPOUT_IF_PPEM_LESS_THAN_THRESHOLD = 1 << 0,
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const DROPOUT_IF_ROTATED = 1 << 1,
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const DROPOUT_IF_STRETCHED = 1 << 2,
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const NO_DROPOUT_IF_PPEM_GREATER_THAN_THRESHOLD = 1 << 3,
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const NO_DROPOUT_IF_UNROTATED = 1 << 4,
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const NO_DROPOUT_IF_UNSTRETCHED = 1 << 5,
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}
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}
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#[derive(Copy, Clone, PartialEq, Debug)]
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#[repr(u8)]
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enum ScanType {
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SimpleDropoutControlIncludingStubs = 0,
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SimpleDropoutControlExcludingStubs = 1,
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NoDropoutControl = 2,
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SmartDropoutControlIncludingStubs = 3,
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SmartDropoutControlExcludingStubs = 4,
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}
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#[derive(Copy, Clone, PartialEq, Debug)]
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#[repr(u8)]
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enum ZonePoint {
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Zone1Point2 = 0,
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Zone0Point1 = 1,
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||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
struct SetRP0(pub bool);
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
struct ApplyMinimumDistance(pub bool);
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
struct ShouldRound(pub bool);
|
||||
|
||||
// See `MDRP` (ttinst2.doc, 277)
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
#[repr(u8)]
|
||||
enum DistanceType {
|
||||
Gray = 0,
|
||||
Black = 1,
|
||||
White = 2,
|
||||
}
|
||||
|
||||
bitflags! {
|
||||
flags GraphicsStateFlags: u8 {
|
||||
// See `FLIPON` (default true) (ttinst1.doc, 252).
|
||||
const AUTO_FLIP = 1 << 1,
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,508 @@
|
|||
// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
|
||||
// file at the top-level directory of this distribution and at
|
||||
// http://rust-lang.org/COPYRIGHT.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||||
// option. This file may not be copied, modified, or distributed
|
||||
// except according to those terms.
|
||||
|
||||
//! TrueType instructions.
|
||||
|
||||
/// All TrueType instructions.
|
||||
#[derive(Clone, Copy, Debug)]
|
||||
pub enum Instruction<'a> {
|
||||
/// Push N Bytes (0x40) (ttinst1.doc, p. 189)
|
||||
/// Push Bytes (0xb0-0xb7) (ttinst1.doc, p. 191)
|
||||
Pushb(&'a [u8]),
|
||||
/// Push N Words (0x41) (ttinst1.doc, p. 190)
|
||||
/// Push Words (0xb8-0xbf) (ttinst1.doc, p. 192)
|
||||
Pushw(&'a [u8]),
|
||||
/// Read Store (0x43) (ttinst1.doc, p. 194)
|
||||
Rs,
|
||||
/// Write Store (0x42) (ttinst1.doc, p. 195)
|
||||
Ws,
|
||||
/// Write Control Value Table in Pixel Units (0x44) (ttinst1.doc, 197)
|
||||
Wcvtp,
|
||||
/// Write Control Value Table in FUints (0x70) (ttinst1.doc, 198)
|
||||
Wcvtf,
|
||||
/// Read Control Value Table (0x45) (ttinst1.doc, 199)
|
||||
Rcvt,
|
||||
/// Set Freedom and Projection Vectors to Coordinate Axis (0x00-0x01) (ttinst1.doc, 202)
|
||||
Svtca(Axis),
|
||||
/// Set Projection Vector to Coordinate Axis (0x02-0x03) (ttinst1.doc, 203)
|
||||
Spvtca(Axis),
|
||||
/// Set Freedom Vector to Coordinate Axis (0x04-0x05) (ttinst1.doc, 204)
|
||||
Sfvtca(Axis),
|
||||
/// Set Projection Vector to Line (0x06-0x07) (ttinst1.doc, 205-207)
|
||||
Spvtl(LineOrientation),
|
||||
/// Set Freedom Vector to Line (0x08-0x09) (ttinst1.doc, 208-209)
|
||||
Sfvtl(LineOrientation),
|
||||
/// Set Freedom Vector to Projection Vector (0x0e) (ttinst1.doc, 210)
|
||||
Sfvtpv,
|
||||
/// Set Dual Projection Vector to Line (0x86-0x87) (ttinst1.doc, 211)
|
||||
Sdpvtl(LineOrientation),
|
||||
/// Set Projection Vector From Stack (0x0a) (ttinst1.doc, 212-213)
|
||||
Spvfs,
|
||||
/// Set Freedom Vector From Stack (0x0b) (ttinst1.doc, 214-215)
|
||||
Sfvfs,
|
||||
/// Get Projection Vector (0x0c) (ttinst1.doc, 216-217)
|
||||
Gpv,
|
||||
/// Get Freedom Vector (0x0d) (ttinst1.doc, 218-219)
|
||||
Gfv,
|
||||
/// Set Reference Point 0 (0x10) (ttinst1.doc, 220)
|
||||
Srp0,
|
||||
/// Set Reference Point 1 (0x11) (ttinst1.doc, 221)
|
||||
Srp1,
|
||||
/// Set Reference Point 2 (0x12) (ttinst1.doc, 222)
|
||||
Srp2,
|
||||
/// Set Zone Pointer 0 (0x13) (ttinst1.doc, 223)
|
||||
Szp0,
|
||||
/// Set Zone Pointer 1 (0x14) (ttinst1.doc, 224)
|
||||
Szp1,
|
||||
/// Set Zone Pointer 2 (0x15) (ttinst1.doc, 225)
|
||||
Szp2,
|
||||
/// Set Zone Pointers (0x16) (ttinst1.doc, 226)
|
||||
Szps,
|
||||
/// Round to Half Grid (0x19) (ttinst1.doc, 227)
|
||||
Rthg,
|
||||
/// Round to Grid (0x18) (ttinst1.doc, 228)
|
||||
Rtg,
|
||||
/// Round to Double Grid (0x3d) (ttinst1.doc, 229)
|
||||
Rtdg,
|
||||
/// Round Down to Grid (0x7d) (ttinst1.doc, 230)
|
||||
Rdtg,
|
||||
/// Round Up to Grid (0x7c) (ttinst1.doc, 231)
|
||||
Rutg,
|
||||
/// Round Off (0x7a) (ttinst1.doc, 232)
|
||||
Roff,
|
||||
/// Super Round (0x76) (ttinst1.doc, 233-238)
|
||||
Sround,
|
||||
/// Super Round 45 Degrees (0x77) (ttinst1.doc, 239)
|
||||
S45round,
|
||||
/// Set Loop Variable (0x17) (ttinst1.doc, 240)
|
||||
Sloop,
|
||||
/// Set Minimum Distance (0x1a) (ttinst1.doc, 241)
|
||||
Smd,
|
||||
/// Instruction Execution Control (0x8e) (ttinst1.doc, 242-243)
|
||||
Instctrl,
|
||||
/// Scan Conversion Control (0x85) (ttinst1.doc, 244-245)
|
||||
Scanctrl,
|
||||
/// Set Control Value Table Cut In (0x1d) (ttinst1.doc, 249)
|
||||
Scvtci,
|
||||
/// Set Single Width Cut In (0x1e) (ttinst1.doc, 250)
|
||||
Sswci,
|
||||
/// Set Single Width (0x1f) (ttinst1.doc, 251)
|
||||
Ssw,
|
||||
/// Set Auto Flip Boolean to On (0x4d) (ttinst1.doc, 252)
|
||||
Flipon,
|
||||
/// Set Auto Flip Boolean to Off (0x4e) (ttinst1.doc, 253)
|
||||
Flipoff,
|
||||
/// Set Angle Weight (0x7e) (ttinst1.doc, 254)
|
||||
Sangw,
|
||||
/// Set Delta Base (0x5e) (ttinst1.doc, 255)
|
||||
Sdb,
|
||||
/// Set Delta Shift (0x5f) (ttinst1.doc, 256)
|
||||
Sds,
|
||||
/// Get Coordinate (0x46-0x47) (ttinst1.doc, 258-259)
|
||||
Gc(WhichPosition),
|
||||
/// Set Coordinate From Stack (0x48) (ttinst1.doc, 260)
|
||||
Scfs,
|
||||
/// Measure Distance (0x49-0x4a) (ttinst1.doc, 261-262)
|
||||
Md(WhichPosition),
|
||||
/// Measure Pixels Per Em (0x4b) (ttinst1.doc, 263)
|
||||
Mppem,
|
||||
/// Measure Point Size (0x4c) (ttinst1.doc, 264)
|
||||
Mps,
|
||||
/// Flip Point (0x80) (ttinst2.doc, 263)
|
||||
Flippt,
|
||||
/// Flip Range On (0x81) (ttinst2.doc, 264)
|
||||
Fliprgon,
|
||||
/// Flip Range Off (0x82) (ttinst2.doc, 265)
|
||||
Fliprgoff,
|
||||
/// Shift Point by Last Point (0x32-0x33) (ttinst2.doc, 266)
|
||||
Shp(ZonePoint),
|
||||
/// Shift Contour by Last Point (0x34-0x35) (ttinst2.doc, 267)
|
||||
Shc(ZonePoint),
|
||||
/// Shift Zone by Last Point (0x36-0x37) (ttinst2.doc, 268)
|
||||
Shz(ZonePoint),
|
||||
/// Shift Point by Pixel Amount (0x38) (ttinst2.doc, 269)
|
||||
Shpix,
|
||||
/// Move Stack Indirect Relative Point (0x3a-0x3b) (ttinst2.doc, 270)
|
||||
Msirp(SetRP0),
|
||||
/// Move Direct Absolute Point (0x2e-0x2f) (ttinst2.doc, 271)
|
||||
Mdap(ShouldRound),
|
||||
/// Move Indirect Absolute Point (0x3e-0x3f) (ttinst2.doc, 272-275)
|
||||
Miap(ShouldRound),
|
||||
/// Move Direct Relative Point (0xc0-0xdf) (ttinst2.doc, 276-283)
|
||||
Mdrp(SetRP0, ApplyMinimumDistance, ShouldRound, DistanceType),
|
||||
/// Align Relative Point (0x3c) (ttinst2.doc, 284)
|
||||
Alignrp,
|
||||
/// Move Point to Intersection of Two Lines (0x0f) (ttinst2.doc, 286-288)
|
||||
Isect,
|
||||
/// Align Points (0x27) (ttinst2.doc, 289)
|
||||
Alignpts,
|
||||
/// Interpolate Point by Last Relative Stretch (0x39) (ttinst2.doc, 290)
|
||||
Ip,
|
||||
/// Untouch Point (0x29) (ttinst2.doc, 291)
|
||||
Utp,
|
||||
/// Interpolate Untouched Points Through Outline (0x30-0x31) (ttinst2.doc, 292)
|
||||
Iup(Axis),
|
||||
/// Delta Exception P1 (0x5d) (ttinst2.doc, 296)
|
||||
Deltap1,
|
||||
/// Delta Exception P2 (0x71) (ttinst2.doc, 297)
|
||||
Deltap2,
|
||||
/// Delta Exception P3 (0x72) (ttinst2.doc, 298)
|
||||
Deltap3,
|
||||
/// Delta Exception C1 (0x73) (ttinst2.doc, 299)
|
||||
Deltac1,
|
||||
/// Delta Exception C2 (0x74) (ttinst2.doc, 300)
|
||||
Deltac2,
|
||||
/// Delta Exception C3 (0x75) (ttinst2.doc, 301)
|
||||
Deltac3,
|
||||
/// Duplicate Top Stack Element (0x20) (ttinst2.doc, 304)
|
||||
Dup,
|
||||
/// Pop Top Stack Element (0x21) (ttinst2.doc, 305)
|
||||
Pop,
|
||||
/// Clear the Entire Stack (0x22) (ttinst2.doc, 306)
|
||||
Clear,
|
||||
/// Swap the Top Two Elements on the Stack (0x23) (ttinst2.doc, 307)
|
||||
Swap,
|
||||
/// Return the Depth of the Stack (0x24) (ttinst2.doc, 308)
|
||||
Depth,
|
||||
/// Copy an Indexed Element to the Top of the Stack (0x25) (ttinst2.doc, 309)
|
||||
Cindex,
|
||||
/// Move an Indexed Element to the Top of the Stack (0x26) (ttinst2.doc, 310)
|
||||
Mindex,
|
||||
/// Roll the Top Three Stack Elements (0x8a) (ttinst2.doc, 311)
|
||||
Roll,
|
||||
/// If Test (0x58) (ttinst2.doc, 313-314)
|
||||
If,
|
||||
/// Else (0x1b) (ttinst2.doc, 315)
|
||||
Else,
|
||||
/// End If (0x59) (ttinst2.doc, 316)
|
||||
EIf,
|
||||
/// Jump Relative on True (0x78) (ttinst2.doc, 317-318)
|
||||
Jrot,
|
||||
/// Jump (0x1c) (ttinst2.doc, 319)
|
||||
Jmpr,
|
||||
/// Jump Relative on False (0x79) (ttinst2.doc, 320-321)
|
||||
Jrof,
|
||||
/// Less Than (0x50) (ttinst2.doc, 323)
|
||||
Lt,
|
||||
/// Less Than or Equal (0x51) (ttinst2.doc, 324)
|
||||
Lteq,
|
||||
/// Greater Than (0x52) (ttinst2.doc, 325)
|
||||
Gt,
|
||||
/// Greater Than or Equal (0x53) (ttinst2.doc, 326)
|
||||
Gteq,
|
||||
/// Equal (0x54) (ttinst2.doc, 327)
|
||||
Eq,
|
||||
/// Not Equal (0x55) (ttinst2.doc, 328)
|
||||
Neq,
|
||||
/// Odd (0x56) (ttinst2.doc, 329)
|
||||
Odd,
|
||||
/// Even (0x57) (ttinst2.doc, 330)
|
||||
Even,
|
||||
/// Logical And (0x5a) (ttinst2.doc, 331-332)
|
||||
And,
|
||||
/// Logical Or (0x5b) (ttinst2.doc, 333)
|
||||
Or,
|
||||
/// Logical Not (0x5c) (ttinst2.doc, 334)
|
||||
Not,
|
||||
/// Add (0x60) (ttinst2.doc, 336)
|
||||
Add,
|
||||
/// Subtract (0x61) (ttinst2.doc, 337)
|
||||
Sub,
|
||||
/// Divide (0x62) (ttinst2.doc, 338)
|
||||
Div,
|
||||
/// Multiply (0x63) (ttinst2.doc, 339)
|
||||
Mul,
|
||||
/// Absolute Value (0x64) (ttinst2.doc, 340)
|
||||
Abs,
|
||||
/// Negate (0x65) (ttinst2.doc, 341)
|
||||
Neg,
|
||||
/// Floor (0x66) (ttinst2.doc, 342)
|
||||
Floor,
|
||||
/// Ceiling (0x67) (ttinst2.doc, 343)
|
||||
Ceiling,
|
||||
/// Maximum of Top Two Stack Elements (0x8b) (ttinst2.doc, 344)
|
||||
Max,
|
||||
/// Minimum of Top Two Stack Elements (0x8c) (ttinst2.doc, 345)
|
||||
Min,
|
||||
/// Round Value (0x68-0x6b) (ttinst2.doc, 347)
|
||||
Round(DistanceType),
|
||||
/// No Rounding of Value (0x6c-0x6f) (ttinst2.doc, 349)
|
||||
Nround(DistanceType),
|
||||
/// Function Definition (0x2c) (ttinst2.doc, 351)
|
||||
Fdef,
|
||||
/// End Function Definition (0x2d) (ttinst2.doc, 352)
|
||||
Endf,
|
||||
/// Call Function (0x2b) (ttinst2.doc, 353)
|
||||
Call,
|
||||
/// Loop and Call Function (0x2a) (ttinst2.doc, 354)
|
||||
Loopcall,
|
||||
/// Instruction Definition (0x89) (ttinst2.doc, 355)
|
||||
Idef,
|
||||
/// Debug Call (0x4f) (ttinst2.doc, 356)
|
||||
Debug,
|
||||
/// Get Information (0x88) (ttinst2.doc, 357-360)
|
||||
Getinfo,
|
||||
/// Get Variation (0x91) (ttinst2.doc, 361)
|
||||
Getvariation,
|
||||
}
|
||||
|
||||
impl<'a> Instruction<'a> {
|
||||
#[inline]
|
||||
pub fn parse<'b, 'c>(data: &'b [u8], pc: &'c mut usize)
|
||||
-> Result<Instruction<'b>, ParseError> {
|
||||
let op = try!(get(data, pc).ok_or(ParseError::Eof));
|
||||
match op {
|
||||
0x40 | 0xb0...0xb7 => {
|
||||
let count = if op == 0x40 {
|
||||
try!(get(data, pc).ok_or(ParseError::UnexpectedEof)) as usize
|
||||
} else {
|
||||
(op as usize & 7) + 1
|
||||
};
|
||||
if *pc + count <= data.len() {
|
||||
let insn = Instruction::Pushb(&data[*pc..(*pc + count)]);
|
||||
*pc += count;
|
||||
Ok(insn)
|
||||
} else {
|
||||
Err(ParseError::UnexpectedEof)
|
||||
}
|
||||
}
|
||||
0x41 | 0xb8...0xbf => {
|
||||
let count = if op == 0x41 {
|
||||
try!(get(data, pc).ok_or(ParseError::UnexpectedEof)) as usize * 2
|
||||
} else {
|
||||
((op as usize & 7) + 1) * 2
|
||||
};
|
||||
if *pc + count <= data.len() {
|
||||
let insn = Instruction::Pushw(&data[*pc..(*pc + count)]);
|
||||
*pc += count;
|
||||
Ok(insn)
|
||||
} else {
|
||||
Err(ParseError::UnexpectedEof)
|
||||
}
|
||||
}
|
||||
0x43 => Ok(Instruction::Rs),
|
||||
0x42 => Ok(Instruction::Ws),
|
||||
0x44 => Ok(Instruction::Wcvtp),
|
||||
0x70 => Ok(Instruction::Wcvtf),
|
||||
0x45 => Ok(Instruction::Rcvt),
|
||||
0x00 => Ok(Instruction::Svtca(Axis::Y)),
|
||||
0x01 => Ok(Instruction::Svtca(Axis::X)),
|
||||
0x02 => Ok(Instruction::Spvtca(Axis::Y)),
|
||||
0x03 => Ok(Instruction::Spvtca(Axis::X)),
|
||||
0x04 => Ok(Instruction::Sfvtca(Axis::Y)),
|
||||
0x05 => Ok(Instruction::Sfvtca(Axis::X)),
|
||||
0x06 => Ok(Instruction::Spvtl(LineOrientation::Parallel)),
|
||||
0x07 => Ok(Instruction::Spvtl(LineOrientation::Perpendicular)),
|
||||
0x08 => Ok(Instruction::Sfvtl(LineOrientation::Parallel)),
|
||||
0x09 => Ok(Instruction::Sfvtl(LineOrientation::Perpendicular)),
|
||||
0x0e => Ok(Instruction::Sfvtpv),
|
||||
0x86 => Ok(Instruction::Sdpvtl(LineOrientation::Parallel)),
|
||||
0x87 => Ok(Instruction::Sdpvtl(LineOrientation::Perpendicular)),
|
||||
0x0a => Ok(Instruction::Spvfs),
|
||||
0x0b => Ok(Instruction::Sfvfs),
|
||||
0x0c => Ok(Instruction::Gpv),
|
||||
0x0d => Ok(Instruction::Gfv),
|
||||
0x10 => Ok(Instruction::Srp0),
|
||||
0x11 => Ok(Instruction::Srp1),
|
||||
0x12 => Ok(Instruction::Srp2),
|
||||
0x13 => Ok(Instruction::Szp0),
|
||||
0x14 => Ok(Instruction::Szp1),
|
||||
0x15 => Ok(Instruction::Szp2),
|
||||
0x16 => Ok(Instruction::Szps),
|
||||
0x19 => Ok(Instruction::Rthg),
|
||||
0x18 => Ok(Instruction::Rtg),
|
||||
0x3d => Ok(Instruction::Rtdg),
|
||||
0x7d => Ok(Instruction::Rdtg),
|
||||
0x7c => Ok(Instruction::Rutg),
|
||||
0x7a => Ok(Instruction::Roff),
|
||||
0x76 => Ok(Instruction::Sround),
|
||||
0x77 => Ok(Instruction::S45round),
|
||||
0x17 => Ok(Instruction::Sloop),
|
||||
0x1a => Ok(Instruction::Smd),
|
||||
0x8e => Ok(Instruction::Instctrl),
|
||||
0x85 => Ok(Instruction::Scanctrl),
|
||||
0x1d => Ok(Instruction::Scvtci),
|
||||
0x1e => Ok(Instruction::Sswci),
|
||||
0x1f => Ok(Instruction::Ssw),
|
||||
0x4d => Ok(Instruction::Flipon),
|
||||
0x4e => Ok(Instruction::Flipoff),
|
||||
0x7e => Ok(Instruction::Sangw),
|
||||
0x5e => Ok(Instruction::Sdb),
|
||||
0x5f => Ok(Instruction::Sds),
|
||||
0x46 => Ok(Instruction::Gc(WhichPosition::Current)),
|
||||
0x47 => Ok(Instruction::Gc(WhichPosition::Original)),
|
||||
0x48 => Ok(Instruction::Scfs),
|
||||
0x49 => Ok(Instruction::Md(WhichPosition::Current)),
|
||||
0x4a => Ok(Instruction::Md(WhichPosition::Original)),
|
||||
0x4b => Ok(Instruction::Mppem),
|
||||
0x4c => Ok(Instruction::Mps),
|
||||
0x80 => Ok(Instruction::Flippt),
|
||||
0x81 => Ok(Instruction::Fliprgon),
|
||||
0x82 => Ok(Instruction::Fliprgoff),
|
||||
0x32 => Ok(Instruction::Shp(ZonePoint::Zone1Point2)),
|
||||
0x33 => Ok(Instruction::Shp(ZonePoint::Zone0Point1)),
|
||||
0x34 => Ok(Instruction::Shc(ZonePoint::Zone1Point2)),
|
||||
0x35 => Ok(Instruction::Shc(ZonePoint::Zone0Point1)),
|
||||
0x36 => Ok(Instruction::Shz(ZonePoint::Zone1Point2)),
|
||||
0x37 => Ok(Instruction::Shz(ZonePoint::Zone0Point1)),
|
||||
0x38 => Ok(Instruction::Shpix),
|
||||
0x3a | 0x3b => Ok(Instruction::Msirp(SetRP0(op == 0x3b))),
|
||||
0x2e | 0x2f => Ok(Instruction::Mdap(ShouldRound(op == 0x2f))),
|
||||
0x3e | 0x3f => Ok(Instruction::Miap(ShouldRound(op == 0x3f))),
|
||||
0xc0...0xdf => {
|
||||
Ok(Instruction::Mdrp(SetRP0((op & 0b10000) != 0),
|
||||
ApplyMinimumDistance((op & 0b01000) != 0),
|
||||
ShouldRound((op & 0b00100) != 0),
|
||||
try!(DistanceType::parse(op & 0b00011))))
|
||||
}
|
||||
0x3c => Ok(Instruction::Alignrp),
|
||||
0x0f => Ok(Instruction::Isect),
|
||||
0x27 => Ok(Instruction::Alignpts),
|
||||
0x39 => Ok(Instruction::Ip),
|
||||
0x29 => Ok(Instruction::Utp),
|
||||
0x30 => Ok(Instruction::Iup(Axis::Y)),
|
||||
0x31 => Ok(Instruction::Iup(Axis::X)),
|
||||
0x5d => Ok(Instruction::Deltap1),
|
||||
0x71 => Ok(Instruction::Deltap2),
|
||||
0x72 => Ok(Instruction::Deltap3),
|
||||
0x73 => Ok(Instruction::Deltac1),
|
||||
0x74 => Ok(Instruction::Deltac2),
|
||||
0x75 => Ok(Instruction::Deltac3),
|
||||
0x20 => Ok(Instruction::Dup),
|
||||
0x21 => Ok(Instruction::Pop),
|
||||
0x22 => Ok(Instruction::Clear),
|
||||
0x23 => Ok(Instruction::Swap),
|
||||
0x24 => Ok(Instruction::Depth),
|
||||
0x25 => Ok(Instruction::Cindex),
|
||||
0x26 => Ok(Instruction::Mindex),
|
||||
0x8a => Ok(Instruction::Roll),
|
||||
0x58 => Ok(Instruction::If),
|
||||
0x1b => Ok(Instruction::Else),
|
||||
0x59 => Ok(Instruction::EIf),
|
||||
0x78 => Ok(Instruction::Jrot),
|
||||
0x1c => Ok(Instruction::Jmpr),
|
||||
0x79 => Ok(Instruction::Jrof),
|
||||
0x50 => Ok(Instruction::Lt),
|
||||
0x51 => Ok(Instruction::Lteq),
|
||||
0x52 => Ok(Instruction::Gt),
|
||||
0x53 => Ok(Instruction::Gteq),
|
||||
0x54 => Ok(Instruction::Eq),
|
||||
0x55 => Ok(Instruction::Neq),
|
||||
0x56 => Ok(Instruction::Odd),
|
||||
0x57 => Ok(Instruction::Even),
|
||||
0x5a => Ok(Instruction::And),
|
||||
0x5b => Ok(Instruction::Or),
|
||||
0x5c => Ok(Instruction::Not),
|
||||
0x60 => Ok(Instruction::Add),
|
||||
0x61 => Ok(Instruction::Sub),
|
||||
0x62 => Ok(Instruction::Div),
|
||||
0x63 => Ok(Instruction::Mul),
|
||||
0x64 => Ok(Instruction::Abs),
|
||||
0x65 => Ok(Instruction::Neg),
|
||||
0x66 => Ok(Instruction::Floor),
|
||||
0x67 => Ok(Instruction::Ceiling),
|
||||
0x8b => Ok(Instruction::Max),
|
||||
0x8c => Ok(Instruction::Min),
|
||||
0x68...0x6b => Ok(Instruction::Round(try!(DistanceType::parse(op & 0b11)))),
|
||||
0x6c...0x6f => Ok(Instruction::Nround(try!(DistanceType::parse(op & 0b11)))),
|
||||
0x2c => Ok(Instruction::Fdef),
|
||||
0x2d => Ok(Instruction::Endf),
|
||||
0x2b => Ok(Instruction::Call),
|
||||
0x2a => Ok(Instruction::Loopcall),
|
||||
0x89 => Ok(Instruction::Idef),
|
||||
0x4f => Ok(Instruction::Debug),
|
||||
0x88 => Ok(Instruction::Getinfo),
|
||||
0x91 => Ok(Instruction::Getvariation),
|
||||
_ => Err(ParseError::UnknownOpcode),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn get(data: &[u8], pc: &mut usize) -> Option<u8> {
|
||||
match data.get(*pc) {
|
||||
Some(&byte) => {
|
||||
*pc += 1;
|
||||
Some(byte)
|
||||
}
|
||||
None => None,
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum Axis {
|
||||
Y = 0,
|
||||
X = 1,
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum LineOrientation {
|
||||
Parallel = 0,
|
||||
Perpendicular = 1,
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum WhichPosition {
|
||||
// Use the current position.
|
||||
Current = 0,
|
||||
// Use the position in the original outline.
|
||||
Original = 1,
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum ZonePoint {
|
||||
Zone1Point2 = 0,
|
||||
Zone0Point1 = 1,
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub struct SetRP0(pub bool);
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub struct ApplyMinimumDistance(pub bool);
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub struct ShouldRound(pub bool);
|
||||
|
||||
// See `MDRP` (ttinst2.doc, 277)
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum DistanceType {
|
||||
Gray = 0,
|
||||
Black = 1,
|
||||
White = 2,
|
||||
}
|
||||
|
||||
impl DistanceType {
|
||||
fn parse(value: u8) -> Result<DistanceType, ParseError> {
|
||||
match value {
|
||||
0 => Ok(DistanceType::Gray),
|
||||
1 => Ok(DistanceType::Black),
|
||||
2 => Ok(DistanceType::White),
|
||||
_ => Err(ParseError::InvalidDistanceType),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub enum ParseError {
|
||||
/// The instruction stream terminated normally.
|
||||
Eof,
|
||||
/// The instruction stream terminated abnormally.
|
||||
UnexpectedEof,
|
||||
/// An unexpected opcode was encountered.
|
||||
UnknownOpcode,
|
||||
/// An unexpected value was encountered for `DistanceType`.
|
||||
InvalidDistanceType,
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,147 @@
|
|||
// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
|
||||
// file at the top-level directory of this distribution and at
|
||||
// http://rust-lang.org/COPYRIGHT.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||||
// option. This file may not be copied, modified, or distributed
|
||||
// except according to those terms.
|
||||
|
||||
#![allow(dead_code)]
|
||||
|
||||
//! The TrueType hinting VM.
|
||||
//!
|
||||
//! See: https://www.microsoft.com/typography/otspec/ttinst.htm
|
||||
|
||||
use byteorder::{BigEndian, ByteOrder};
|
||||
use error::HintingError;
|
||||
use euclid::Point2D;
|
||||
use font::Font;
|
||||
|
||||
mod insns;
|
||||
|
||||
/// A TrueType hinting virtual machine.
|
||||
pub struct Hinter {
|
||||
// The Control Value Table: the VM's initialized memory.
|
||||
control_value_table: Vec<i16>,
|
||||
// The Storage Area: the VM's uninitialized memory.
|
||||
storage_area: Vec<u32>,
|
||||
// The projection vector, in 2.14 fixed point.
|
||||
projection_vector: Point2D<i16>,
|
||||
// The dual projection vector, in 2.14 fixed point.
|
||||
dual_projection_vector: Point2D<i16>,
|
||||
// The freedom vector, in 2.14 fixed point.
|
||||
freedom_vector: Point2D<i16>,
|
||||
// The reference point indices.
|
||||
reference_points: [u32; 3],
|
||||
// The zone numbers.
|
||||
zone_points: [u32; 3],
|
||||
// The round state.
|
||||
round_state: RoundState,
|
||||
// The loop variable count.
|
||||
loop_count: u32,
|
||||
// The minimum distance value.
|
||||
minimum_distance: u32,
|
||||
// Instruction control flags.
|
||||
instruction_control: InstructionControl,
|
||||
// Threshold value for ppem. See `SCANCTRL` (ttinst1.doc, 244-245).
|
||||
dropout_threshold: u8,
|
||||
// Special dropout control.
|
||||
dropout_control: DropoutControl,
|
||||
// The scan type. See `SCANTYPE` (ttinst1.doc, 246-247).
|
||||
scan_type: ScanType,
|
||||
// The control value cut in. See `SCVTSI` (ttinst1.doc, 249).
|
||||
control_value_cut_in: u32,
|
||||
// The single width cut in. See `SSWCI` (ttinst1.doc, 250).
|
||||
single_width_cut_in: u32,
|
||||
// The single width value. See `SSW` (ttinst1.doc, 251).
|
||||
single_width_value: i32,
|
||||
// The angle weight. Per spec, does nothing. See `SANGW` (ttinst1.doc, 254).
|
||||
angle_weight: u32,
|
||||
// The delta base. See `SDB` (ttinst1.doc, 255).
|
||||
delta_base: u32,
|
||||
// The delta shift. See `SDS` (ttinst1.doc, 256).
|
||||
delta_shift: u32,
|
||||
// Various graphics state flags.
|
||||
graphics_state_flags: GraphicsStateFlags,
|
||||
}
|
||||
|
||||
impl Hinter {
|
||||
pub fn new(font: &Font) -> Result<Hinter, HintingError> {
|
||||
let cvt = font.control_value_table().chunks(2).map(BigEndian::read_i16).collect();
|
||||
let hinter = Hinter {
|
||||
control_value_table: cvt,
|
||||
storage_area: vec![],
|
||||
projection_vector: Point2D::zero(),
|
||||
dual_projection_vector: Point2D::zero(),
|
||||
freedom_vector: Point2D::zero(),
|
||||
reference_points: [0; 3],
|
||||
zone_points: [0; 3],
|
||||
round_state: RoundState::RoundToHalfGrid,
|
||||
loop_count: 0,
|
||||
minimum_distance: 0,
|
||||
instruction_control: InstructionControl::empty(),
|
||||
dropout_threshold: 0,
|
||||
dropout_control: DropoutControl::empty(),
|
||||
scan_type: ScanType::SimpleDropoutControlIncludingStubs,
|
||||
control_value_cut_in: 0,
|
||||
single_width_cut_in: 0,
|
||||
single_width_value: 0,
|
||||
angle_weight: 0,
|
||||
delta_base: 0,
|
||||
delta_shift: 0,
|
||||
graphics_state_flags: AUTO_FLIP,
|
||||
};
|
||||
|
||||
Ok(hinter)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
#[repr(u8)]
|
||||
enum RoundState {
|
||||
RoundToHalfGrid = 0,
|
||||
RoundToGrid = 1,
|
||||
RoundToDoubleGrid = 2,
|
||||
RoundDownToGrid = 3,
|
||||
RoundUpToGrid = 4,
|
||||
RoundOff = 5,
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
#[repr(u8)]
|
||||
pub enum ScanType {
|
||||
SimpleDropoutControlIncludingStubs = 0,
|
||||
SimpleDropoutControlExcludingStubs = 1,
|
||||
NoDropoutControl = 2,
|
||||
SmartDropoutControlIncludingStubs = 3,
|
||||
SmartDropoutControlExcludingStubs = 4,
|
||||
}
|
||||
|
||||
bitflags! {
|
||||
pub flags InstructionControl: u8 {
|
||||
const INHIBIT_GRID_FITTING = 1 << 0,
|
||||
const IGNORE_CVT_PARAMETERS = 1 << 1,
|
||||
const NATIVE_SUBPIXEL_AA = 1 << 2,
|
||||
}
|
||||
}
|
||||
|
||||
bitflags! {
|
||||
pub flags DropoutControl: u8 {
|
||||
const DROPOUT_IF_PPEM_LESS_THAN_THRESHOLD = 1 << 0,
|
||||
const DROPOUT_IF_ROTATED = 1 << 1,
|
||||
const DROPOUT_IF_STRETCHED = 1 << 2,
|
||||
const NO_DROPOUT_IF_PPEM_GREATER_THAN_THRESHOLD = 1 << 3,
|
||||
const NO_DROPOUT_IF_UNROTATED = 1 << 4,
|
||||
const NO_DROPOUT_IF_UNSTRETCHED = 1 << 5,
|
||||
}
|
||||
}
|
||||
|
||||
bitflags! {
|
||||
flags GraphicsStateFlags: u8 {
|
||||
// See `FLIPON` (default true) (ttinst1.doc, 252).
|
||||
const AUTO_FLIP = 1 << 1,
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue