freetype/truetype: first cut of a bytecode interpreter.
R=gri, bsiegert CC=golang-dev http://codereview.appspot.com/6347057
This commit is contained in:
Nigel Tao
parent
6baa5f0a46
commit
8ed9e9345e
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@ -0,0 +1,210 @@
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// Copyright 2012 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
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// any later version), both of which can be found in the LICENSE file.
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package truetype
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// This file implements a Truetype bytecode interpreter.
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// The opcodes are described at https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html
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import (
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"errors"
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)
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type hinter struct {
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stack [800]int32
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// TODO: add more state, as per https://developer.apple.com/fonts/TTRefMan/RM04/Chap4.html
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}
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func (h *hinter) run(program []byte) error {
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var (
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steps, pc, top int
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opcode uint8
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)
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for int(pc) < len(program) {
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steps++
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if steps == 100000 {
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return errors.New("truetype: hinting: too many instructions")
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}
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opcode = program[pc]
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if popCount[opcode] == q {
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return errors.New("truetype: hinting: unimplemented instruction")
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}
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if top < int(popCount[opcode]) {
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return errors.New("truetype: hinting: stack underflow")
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}
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switch opcode {
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case opDUP:
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if int(top) >= len(h.stack) {
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return errors.New("truetype: hinting: stack overflow")
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}
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h.stack[top] = h.stack[top-1]
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top++
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case opPOP:
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top--
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case opCLEAR:
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top = 0
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case opSWAP:
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h.stack[top-1], h.stack[top-2] = h.stack[top-2], h.stack[top-1]
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case opDEPTH:
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if int(top) >= len(h.stack) {
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return errors.New("truetype: hinting: stack overflow")
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}
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h.stack[top] = int32(top)
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top++
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case opCINDEX, opMINDEX:
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x := int(h.stack[top-1])
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if x <= 0 || x >= top {
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return errors.New("truetype: hinting: invalid data")
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}
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h.stack[top-1] = h.stack[top-1-x]
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if opcode == opMINDEX {
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copy(h.stack[top-1-x:top-1], h.stack[top-x:top])
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top--
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}
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case opNPUSHB:
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opcode = 0
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goto push
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case opNPUSHW:
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opcode = 0x80
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goto push
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case opLT:
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h.stack[top-2] = bool2int32(h.stack[top-2] < h.stack[top-1])
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top--
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case opLTEQ:
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h.stack[top-2] = bool2int32(h.stack[top-2] <= h.stack[top-1])
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top--
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case opGT:
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h.stack[top-2] = bool2int32(h.stack[top-2] > h.stack[top-1])
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top--
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case opGTEQ:
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h.stack[top-2] = bool2int32(h.stack[top-2] >= h.stack[top-1])
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top--
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case opEQ:
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h.stack[top-2] = bool2int32(h.stack[top-2] == h.stack[top-1])
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top--
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case opNEQ:
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h.stack[top-2] = bool2int32(h.stack[top-2] != h.stack[top-1])
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top--
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case opAND:
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h.stack[top-2] = bool2int32(h.stack[top-2] != 0 && h.stack[top-1] != 0)
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top--
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case opOR:
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h.stack[top-2] = bool2int32(h.stack[top-2]|h.stack[top-1] != 0)
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top--
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case opNOT:
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h.stack[top-1] = bool2int32(h.stack[top-1] == 0)
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case opADD:
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h.stack[top-2] += h.stack[top-1]
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top--
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case opSUB:
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h.stack[top-2] -= h.stack[top-1]
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top--
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case opDIV:
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if h.stack[top-1] == 0 {
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return errors.New("truetype: hinting: division by zero")
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}
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h.stack[top-2] = int32((int64(h.stack[top-2]) << 6) / int64(h.stack[top-1]))
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top--
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case opMUL:
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h.stack[top-2] = int32((int64(h.stack[top-2]) * int64(h.stack[top-1])) >> 6)
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top--
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case opABS:
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if h.stack[top-1] < 0 {
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h.stack[top-1] = -h.stack[top-1]
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}
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case opNEG:
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h.stack[top-1] = -h.stack[top-1]
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case opFLOOR:
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h.stack[top-1] &^= 63
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case opCEILING:
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h.stack[top-1] += 63
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h.stack[top-1] &^= 63
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case opPUSHB000, opPUSHB001, opPUSHB010, opPUSHB011, opPUSHB100, opPUSHB101, opPUSHB110, opPUSHB111:
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opcode -= opPUSHB000 - 1
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goto push
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case opPUSHW000, opPUSHW001, opPUSHW010, opPUSHW011, opPUSHW100, opPUSHW101, opPUSHW110, opPUSHW111:
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opcode -= opPUSHW000 - 1
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opcode += 0x80
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goto push
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default:
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return errors.New("truetype: hinting: unrecognized instruction")
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}
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pc++
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continue
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push:
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// push n elements from the program to the stack, where n is the low 7 bits of
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// opcode. If the low 7 bits are zero, then n is the next byte from the program.
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// The high bit being 0 means that the elements are zero-extended bytes.
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// The high bit being 1 means that the elements are sign-extended words.
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{
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width := 1
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if opcode&0x80 != 0 {
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opcode &^= 0x80
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width = 2
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}
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if opcode == 0 {
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pc++
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if int(pc) >= len(program) {
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return errors.New("truetype: hinting: insufficient data")
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}
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opcode = program[pc]
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}
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pc++
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if top+int(opcode) > len(h.stack) {
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return errors.New("truetype: hinting: stack overflow")
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}
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if pc+width*int(opcode) > len(program) {
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return errors.New("truetype: hinting: insufficient data")
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}
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for ; opcode > 0; opcode-- {
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if width == 1 {
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h.stack[top] = int32(program[pc])
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} else {
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h.stack[top] = int32(int8(program[pc]))<<8 | int32(program[pc+1])
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}
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top++
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pc += width
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}
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continue
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}
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}
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return nil
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}
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func bool2int32(b bool) int32 {
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if b {
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return 1
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}
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return 0
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}
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@ -0,0 +1,181 @@
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// Copyright 2012 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
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// any later version), both of which can be found in the LICENSE file.
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package truetype
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import (
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"reflect"
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"strings"
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"testing"
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)
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func TestBytecode(t *testing.T) {
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testCases := []struct {
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desc string
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prog []byte
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want []int32
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errStr string
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}{
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{
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"underflow",
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[]byte{
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opDUP,
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},
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nil,
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"underflow",
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},
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{
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"stack ops",
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[]byte{
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opPUSHB010, // [10, 20, 30]
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10,
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20,
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30,
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opCLEAR, // []
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opPUSHB010, // [40, 50, 60]
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40,
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50,
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60,
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opSWAP, // [40, 60, 50]
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opDUP, // [40, 60, 50, 50]
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opDUP, // [40, 60, 50, 50, 50]
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opPOP, // [40, 60, 50, 50]
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opDEPTH, // [40, 60, 50, 50, 4]
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opCINDEX, // [40, 60, 50, 50, 40]
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opPUSHB000, // [40, 60, 50, 50, 40, 4]
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4,
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opMINDEX, // [40, 50, 50, 40, 60]
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},
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[]int32{40, 50, 50, 40, 60},
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"",
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},
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{
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"push ops",
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[]byte{
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opPUSHB000, // [255]
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255,
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opPUSHW001, // [255, -2, 253]
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255,
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254,
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0,
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253,
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opNPUSHB, // [1, -2, 253, 1, 2]
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2,
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1,
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2,
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opNPUSHW, // [1, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809]
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3,
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4,
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5,
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6,
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7,
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8,
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9,
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},
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[]int32{255, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809},
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"",
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},
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{
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"comparison ops",
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[]byte{
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opPUSHB001, // [10, 20]
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10,
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20,
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opLT, // [1]
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opPUSHB001, // [1, 10, 20]
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10,
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20,
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opLTEQ, // [1, 1]
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opPUSHB001, // [1, 1, 10, 20]
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10,
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20,
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opGT, // [1, 1, 0]
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opPUSHB001, // [1, 1, 0, 10, 20]
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10,
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20,
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opGTEQ, // [1, 1, 0, 0]
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opEQ, // [1, 1, 1]
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opNEQ, // [1, 0]
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},
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[]int32{1, 0},
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"",
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},
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{
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"logical ops",
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[]byte{
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opPUSHB010, // [0, 10, 20]
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0,
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10,
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20,
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opAND, // [0, 1]
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opOR, // [1]
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opNOT, // [0]
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},
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[]int32{0},
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"",
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},
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{
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"arithmetic ops",
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// Calculate abs((-(1 - (2*3)))/2 + 1/64).
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// The answer is 5/2 + 1/64 in ideal numbers, or 161 in 26.6 fixed point math.
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[]byte{
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opPUSHB010, // [64, 128, 192]
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1 << 6,
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2 << 6,
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3 << 6,
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opMUL, // [64, 384]
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opSUB, // [-320]
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opNEG, // [320]
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opPUSHB000, // [320, 128]
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2 << 6,
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opDIV, // [160]
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opPUSHB000, // [160, 1]
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1,
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opADD, // [161]
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opABS, // [161]
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},
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[]int32{161},
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"",
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},
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{
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"floor, ceiling",
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[]byte{
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opPUSHB000, // [96]
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96,
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opFLOOR, // [64]
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opPUSHB000, // [64, 96]
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96,
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opCEILING, // [64, 128]
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},
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[]int32{64, 128},
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"",
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},
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}
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for _, tc := range testCases {
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h := &hinter{}
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err, errStr := h.run(tc.prog), ""
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if err != nil {
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errStr = err.Error()
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}
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if tc.errStr != "" {
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if errStr == "" {
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t.Errorf("%s: got no error, want %q", tc.desc, tc.errStr)
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} else if !strings.Contains(errStr, tc.errStr) {
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t.Errorf("%s: got error %q, want one containing %q", tc.desc, errStr, tc.errStr)
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}
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continue
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}
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if errStr != "" {
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t.Errorf("%s: got error %q, want none", tc.desc, errStr)
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continue
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}
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got := h.stack[:len(tc.want)]
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if !reflect.DeepEqual(got, tc.want) {
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t.Errorf("got %v, want %v", got, tc.want)
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continue
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}
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}
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}
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@ -0,0 +1,293 @@
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// Copyright 2012 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
|
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// any later version), both of which can be found in the LICENSE file.
|
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package truetype
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// The Truetype opcodes are summarized at https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
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// TODO: the opXXX constants without end-of-line comments are not yet implemented.
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const (
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opSVTCA0 = 0x00
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opSVTCA1 = 0x01
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opSPVTCA0 = 0x02
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opSPVTCA1 = 0x03
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opSFVTCA0 = 0x04
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opSFVTCA1 = 0x05
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opSPVTL0 = 0x06
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opSPVTL1 = 0x07
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opSFVTL0 = 0x08
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opSFVTL1 = 0x09
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opSFVFS = 0x0b
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opSPVFS = 0x0a
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opGPV = 0x0c
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opGFV = 0x0d
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opSFVTPV = 0x0e
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opISECT = 0x0f
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opSRP0 = 0x10
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opSRP1 = 0x11
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opSRP2 = 0x12
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opSZP0 = 0x13
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opSZP1 = 0x14
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opSZP2 = 0x15
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opSZPS = 0x16
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opSLOOP = 0x17
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opRTG = 0x18
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opRTHG = 0x19
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opSMD = 0x1a
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opELSE = 0x1b
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opJMPR = 0x1c
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opSCVTCI = 0x1d
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opSSWCI = 0x1e
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opSSW = 0x1f
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opDUP = 0x20 // DUPlicate top stack element
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opPOP = 0x21 // POP top stack element
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opCLEAR = 0x22 // CLEAR the stack
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opSWAP = 0x23 // SWAP the top two elements on the stack
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opDEPTH = 0x24 // DEPTH of the stack
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opCINDEX = 0x25 // Copy the INDEXed element to the top of the stack
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opMINDEX = 0x26 // Move the INDEXed element to the top of the stack
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opALIGNPTS = 0x27
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op_0x28 = 0x28
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opUTP = 0x29
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opLOOPCALL = 0x2a
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opCALL = 0x2b
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opFDEF = 0x2c
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opENDF = 0x2d
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opMDAP0 = 0x2e
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opMDAP1 = 0x2f
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opIUP0 = 0x30
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opIUP1 = 0x31
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opSHP0 = 0x32
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opSHP1 = 0x33
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opSHC0 = 0x34
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opSHC1 = 0x35
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opSHZ0 = 0x36
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opSHZ1 = 0x37
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opSHPIX = 0x38
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opIP = 0x39
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opMSIRP0 = 0x3a
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opMSIRP1 = 0x3b
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opALIGNRP = 0x3c
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opRTGD = 0x3d
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opMIAP0 = 0x3e
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opMIAP1 = 0x3f
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opNPUSHB = 0x40 // PUSH N Bytes
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opNPUSHW = 0x41 // PUSH N Words
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opWS = 0x42
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opRS = 0x43
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opWCVTP = 0x44
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opRCVT = 0x45
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opGC0 = 0x46
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opGC1 = 0x47
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opSCFS = 0x48
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opMD0 = 0x49
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opMD1 = 0x4a
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opMPPEM = 0x4b
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opMPS = 0x4c
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opFLIPON = 0x4d
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opFLIPOFF = 0x4e
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opDEBUG = 0x4f
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opLT = 0x50 // Less Than
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opLTEQ = 0x51 // Less Than or EQual
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opGT = 0x52 // Greater Than
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opGTEQ = 0x53 // Greater Than or EQual
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opEQ = 0x54 // EQual
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opNEQ = 0x55 // Not EQual
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opODD = 0x56
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opEVEN = 0x57
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opIF = 0x58
|
||||
opEIF = 0x59
|
||||
opAND = 0x5a // logical AND
|
||||
opOR = 0x5b // logical OR
|
||||
opNOT = 0x5c // logical NOT
|
||||
opDELTAP1 = 0x5d
|
||||
opSDB = 0x5e
|
||||
opSDS = 0x5f
|
||||
opADD = 0x60 // ADD
|
||||
opSUB = 0x61 // SUBtract
|
||||
opDIV = 0x62 // DIVide
|
||||
opMUL = 0x63 // MULtiply
|
||||
opABS = 0x64 // ABSolute value
|
||||
opNEG = 0x65 // NEGate
|
||||
opFLOOR = 0x66 // FLOOR
|
||||
opCEILING = 0x67 // CEILING
|
||||
opROUND00 = 0x68
|
||||
opROUND01 = 0x69
|
||||
opROUND10 = 0x6a
|
||||
opROUND11 = 0x6b
|
||||
opNROUND00 = 0x6c
|
||||
opNROUND01 = 0x6d
|
||||
opNROUND10 = 0x6e
|
||||
opNROUND11 = 0x6f
|
||||
opWCVTF = 0x70
|
||||
opDELTAP2 = 0x71
|
||||
opDELTAP3 = 0x72
|
||||
opDELTAC1 = 0x73
|
||||
opDELTAC2 = 0x74
|
||||
opDELTAC3 = 0x75
|
||||
opSROUND = 0x76
|
||||
opS45ROUND = 0x77
|
||||
opJROT = 0x78
|
||||
opJROF = 0x79
|
||||
opROFF = 0x7a
|
||||
op_0x7b = 0x7b
|
||||
opRUTG = 0x7c
|
||||
opRDTG = 0x7d
|
||||
opSANGW = 0x7e
|
||||
opAA = 0x7f
|
||||
opFLIPPT = 0x80
|
||||
opFLIPRGON = 0x81
|
||||
opFLIPRGOFF = 0x82
|
||||
op_0x83 = 0x83
|
||||
op_0x84 = 0x84
|
||||
opSCANCTRL = 0x85
|
||||
opSDPVTL0 = 0x86
|
||||
opSDPVTL1 = 0x87
|
||||
opGETINFO = 0x88
|
||||
opIFDEF = 0x89
|
||||
opROLL = 0x8a
|
||||
opMAX = 0x8b
|
||||
opMIN = 0x8c
|
||||
opSCANTYPE = 0x8d
|
||||
opINSTCTRL = 0x8e
|
||||
op_0x8f = 0x8f
|
||||
op_0x90 = 0x90
|
||||
op_0x91 = 0x91
|
||||
op_0x92 = 0x92
|
||||
op_0x93 = 0x93
|
||||
op_0x94 = 0x94
|
||||
op_0x95 = 0x95
|
||||
op_0x96 = 0x96
|
||||
op_0x97 = 0x97
|
||||
op_0x98 = 0x98
|
||||
op_0x99 = 0x99
|
||||
op_0x9a = 0x9a
|
||||
op_0x9b = 0x9b
|
||||
op_0x9c = 0x9c
|
||||
op_0x9d = 0x9d
|
||||
op_0x9e = 0x9e
|
||||
op_0x9f = 0x9f
|
||||
op_0xa0 = 0xa0
|
||||
op_0xa1 = 0xa1
|
||||
op_0xa2 = 0xa2
|
||||
op_0xa3 = 0xa3
|
||||
op_0xa4 = 0xa4
|
||||
op_0xa5 = 0xa5
|
||||
op_0xa6 = 0xa6
|
||||
op_0xa7 = 0xa7
|
||||
op_0xa8 = 0xa8
|
||||
op_0xa9 = 0xa9
|
||||
op_0xaa = 0xaa
|
||||
op_0xab = 0xab
|
||||
op_0xac = 0xac
|
||||
op_0xad = 0xad
|
||||
op_0xae = 0xae
|
||||
op_0xaf = 0xaf
|
||||
opPUSHB000 = 0xb0 // PUSH Bytes
|
||||
opPUSHB001 = 0xb1 // .
|
||||
opPUSHB010 = 0xb2 // .
|
||||
opPUSHB011 = 0xb3 // .
|
||||
opPUSHB100 = 0xb4 // .
|
||||
opPUSHB101 = 0xb5 // .
|
||||
opPUSHB110 = 0xb6 // .
|
||||
opPUSHB111 = 0xb7 // .
|
||||
opPUSHW000 = 0xb8 // PUSH Words
|
||||
opPUSHW001 = 0xb9 // .
|
||||
opPUSHW010 = 0xba // .
|
||||
opPUSHW011 = 0xbb // .
|
||||
opPUSHW100 = 0xbc // .
|
||||
opPUSHW101 = 0xbd // .
|
||||
opPUSHW110 = 0xbe // .
|
||||
opPUSHW111 = 0xbf // .
|
||||
opMDRP00000 = 0xc0
|
||||
opMDRP00001 = 0xc1
|
||||
opMDRP00010 = 0xc2
|
||||
opMDRP00011 = 0xc3
|
||||
opMDRP00100 = 0xc4
|
||||
opMDRP00101 = 0xc5
|
||||
opMDRP00110 = 0xc6
|
||||
opMDRP00111 = 0xc7
|
||||
opMDRP01000 = 0xc8
|
||||
opMDRP01001 = 0xc9
|
||||
opMDRP01010 = 0xca
|
||||
opMDRP01011 = 0xcb
|
||||
opMDRP01100 = 0xcc
|
||||
opMDRP01101 = 0xcd
|
||||
opMDRP01110 = 0xce
|
||||
opMDRP01111 = 0xcf
|
||||
opMDRP10000 = 0xd0
|
||||
opMDRP10001 = 0xd1
|
||||
opMDRP10010 = 0xd2
|
||||
opMDRP10011 = 0xd3
|
||||
opMDRP10100 = 0xd4
|
||||
opMDRP10101 = 0xd5
|
||||
opMDRP10110 = 0xd6
|
||||
opMDRP10111 = 0xd7
|
||||
opMDRP11000 = 0xd8
|
||||
opMDRP11001 = 0xd9
|
||||
opMDRP11010 = 0xda
|
||||
opMDRP11011 = 0xdb
|
||||
opMDRP11100 = 0xdd
|
||||
opMDRP11101 = 0xdc
|
||||
opMDRP11110 = 0xde
|
||||
opMDRP11111 = 0xdf
|
||||
opMIRP00000 = 0xe0
|
||||
opMIRP00001 = 0xe1
|
||||
opMIRP00010 = 0xe2
|
||||
opMIRP00011 = 0xe3
|
||||
opMIRP00100 = 0xe4
|
||||
opMIRP00101 = 0xe5
|
||||
opMIRP00110 = 0xe6
|
||||
opMIRP00111 = 0xe7
|
||||
opMIRP01000 = 0xe8
|
||||
opMIRP01001 = 0xe9
|
||||
opMIRP01010 = 0xea
|
||||
opMIRP01011 = 0xeb
|
||||
opMIRP01100 = 0xec
|
||||
opMIRP01101 = 0xed
|
||||
opMIRP01110 = 0xee
|
||||
opMIRP01111 = 0xef
|
||||
opMIRP10000 = 0xf0
|
||||
opMIRP10001 = 0xf1
|
||||
opMIRP10010 = 0xf2
|
||||
opMIRP10011 = 0xf3
|
||||
opMIRP10100 = 0xf4
|
||||
opMIRP10101 = 0xf5
|
||||
opMIRP10110 = 0xf6
|
||||
opMIRP10111 = 0xf7
|
||||
opMIRP11000 = 0xf8
|
||||
opMIRP11001 = 0xf9
|
||||
opMIRP11010 = 0xfa
|
||||
opMIRP11011 = 0xfb
|
||||
opMIRP11100 = 0xfd
|
||||
opMIRP11101 = 0xfc
|
||||
opMIRP11110 = 0xfe
|
||||
opMIRP11111 = 0xff
|
||||
)
|
||||
|
||||
// popCount is the number of stack elements that each opcode pops.
|
||||
var popCount = [256]uint8{
|
||||
// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x00 - 0x0f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x10 - 0x1f
|
||||
1, 1, 0, 2, 0, 1, 1, q, q, q, q, q, q, q, q, q, // 0x20 - 0x2f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x30 - 0x3f
|
||||
0, 0, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x40 - 0x4f
|
||||
2, 2, 2, 2, 2, 2, q, q, q, q, 2, 2, 1, q, q, q, // 0x50 - 0x5f
|
||||
2, 2, 2, 2, 1, 1, 1, 1, q, q, q, q, q, q, q, q, // 0x60 - 0x6f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x70 - 0x7f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x80 - 0x8f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x90 - 0x9f
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xa0 - 0xaf
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xc0 - 0xcf
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xd0 - 0xdf
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xe0 - 0xef
|
||||
q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xf0 - 0xff
|
||||
}
|
||||
|
||||
// popCount[opcode] == q means that that opcode is not yet implemented.
|
||||
const q = 255
|
||||
|
|
@ -3,7 +3,7 @@
|
|||
// FreeType License or the GNU General Public License version 2 (or
|
||||
// any later version), both of which can be found in the LICENSE file.
|
||||
|
||||
// The truetype package provides a parser for the TTF and TTC file formats.
|
||||
// Package truetype provides a parser for the TTF and TTC file formats.
|
||||
// Those formats are documented at http://developer.apple.com/fonts/TTRefMan/
|
||||
// and http://www.microsoft.com/typography/otspec/
|
||||
//
|
||||
|
|
|
|||
Loading…
Reference in New Issue