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freetype/truetype: odd/even opcodes.

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Also re-arrange some of the switch cases to be in opcode order.

R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6352097
This commit is contained in:
Nigel Tao 2012-07-12 20:49:12 +10:00
parent 20ce6ab4df
commit f2517f3940
3 changed files with 37 additions and 13 deletions
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24
freetype/truetype/hint.go
View file

@ -251,16 +251,9 @@ func (h *hinter) run(program []byte) error {
top--
h.stack[top-1] = bool2int32(h.stack[top-1] != h.stack[top])
case opAND:
top--
h.stack[top-1] = bool2int32(h.stack[top-1] != 0 && h.stack[top] != 0)
case opOR:
top--
h.stack[top-1] = bool2int32(h.stack[top-1]|h.stack[top] != 0)
case opNOT:
h.stack[top-1] = bool2int32(h.stack[top-1] == 0)
case opODD, opEVEN:
i := h.round(f26dot6(h.stack[top-1])) >> 6
h.stack[top-1] = int32(i&1) ^ int32(opcode-opODD)
case opIF:
top--
@ -272,6 +265,17 @@ func (h *hinter) run(program []byte) error {
case opEIF:
// No-op.
case opAND:
top--
h.stack[top-1] = bool2int32(h.stack[top-1] != 0 && h.stack[top] != 0)
case opOR:
top--
h.stack[top-1] = bool2int32(h.stack[top-1]|h.stack[top] != 0)
case opNOT:
h.stack[top-1] = bool2int32(h.stack[top-1] == 0)
case opADD:
top--
h.stack[top-1] += h.stack[top]

20
freetype/truetype/hint_test.go
View file

@ -187,6 +187,26 @@ func TestBytecode(t *testing.T) {
[]int32{1, 0},
"",
},
{
"odd/even",
// Calculate odd(2+31/64), odd(2+32/64), even(2), even(1).
[]byte{
opPUSHB000, // [159]
159,
opODD, // [0]
opPUSHB000, // [0, 160]
160,
opODD, // [0, 1]
opPUSHB000, // [0, 1, 128]
128,
opEVEN, // [0, 1, 1]
opPUSHB000, // [0, 1, 1, 64]
64,
opEVEN, // [0, 1, 1, 0]
},
[]int32{0, 1, 1, 0},
"",
},
{
"if true",
[]byte{

6
freetype/truetype/opcodes.go
View file

@ -96,8 +96,8 @@ const (
opGTEQ = 0x53 // Greater Than or EQual
opEQ = 0x54 // EQual
opNEQ = 0x55 // Not EQual
opODD = 0x56
opEVEN = 0x57
opODD = 0x56 // ODD
opEVEN = 0x57 // EVEN
opIF = 0x58 // IF test
opEIF = 0x59 // End IF
opAND = 0x5a // logical AND
@ -276,7 +276,7 @@ var popCount = [256]uint8{
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, 0, q, q, // 0x30 - 0x3f
0, 0, 2, 1, q, q, q, q, q, q, q, q, q, q, q, 0, // 0x40 - 0x4f
2, 2, 2, 2, 2, 2, q, q, 1, 0, 2, 2, 1, q, q, q, // 0x50 - 0x5f
2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, q, q, q, // 0x50 - 0x5f
2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
q, q, q, q, q, q, 1, 1, 2, 2, 0, q, 0, 0, 1, 1, // 0x70 - 0x7f
q, q, q, q, q, q, q, q, q, 1, 3, 2, 2, q, q, q, // 0x80 - 0x8f