freetype/truetype: implement SHP and DELTAP opcodes.
R=bsiegert CC=golang-dev, remyoudompheng https://codereview.appspot.com/16500043
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Nigel Tao
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@ -480,6 +480,24 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
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prevEnd = end
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}
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case opSHP0, opSHP1:
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if top < int(h.gs.loop) {
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return errors.New("truetype: hinting: stack underflow")
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}
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_, _, d, ok := h.displacement(opcode&1 == 0)
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if !ok {
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return errors.New("truetype: hinting: point out of range")
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}
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for ; h.gs.loop != 0; h.gs.loop-- {
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top--
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p := h.point(2, current, h.stack[top])
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if p == nil {
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return errors.New("truetype: hinting: point out of range")
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}
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h.move(p, d, true)
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}
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h.gs.loop = 1
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case opSHZ0, opSHZ1:
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top--
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zonePointer, i, d, ok := h.displacement(opcode&1 == 0)
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@ -740,6 +758,9 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
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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 opDELTAP1:
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goto deltap
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case opSDB:
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top--
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h.gs.deltaBase = h.stack[top]
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@ -794,6 +815,9 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
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// This code does not implement engine compensation, as we don't expect to
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// be used to output on dot-matrix printers.
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case opDELTAP2, opDELTAP3:
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goto deltap
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case opSROUND, opS45ROUND:
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top--
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switch (h.stack[top] >> 6) & 0x03 {
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@ -1130,6 +1154,40 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
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}
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continue
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}
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deltap:
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top--
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n := f26dot6(h.stack[top])
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if top < 2*int(h.gs.loop) {
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return errors.New("truetype: hinting: stack underflow")
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}
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for ; n > 0; n-- {
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top -= 2
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p := h.point(0, current, h.stack[top+1])
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if p == nil {
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return errors.New("truetype: hinting: point out of range")
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}
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b := h.stack[top]
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c := (b & 0xf0) >> 4
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switch opcode {
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case opDELTAP2:
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c += 16
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case opDELTAP3:
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c += 32
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}
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c += h.gs.deltaBase
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if ppem := (h.scale + 1<<5) >> 6; ppem != c {
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continue
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}
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b = (b & 0x0f) - 8
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if b >= 0 {
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b++
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}
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b = b * 64 / (1 << uint32(h.gs.deltaShift))
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h.move(p, f26dot6(b), true)
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}
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pc++
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continue
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}
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return nil
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}
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@ -60,8 +60,8 @@ const (
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opMDAP1 = 0x2f // .
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opIUP0 = 0x30 // Interpolate Untouched Points through the outline
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opIUP1 = 0x31 // .
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opSHP0 = 0x32
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opSHP1 = 0x33
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opSHP0 = 0x32 // SHift Point using reference point
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opSHP1 = 0x33 // .
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opSHC0 = 0x34
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opSHC1 = 0x35
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opSHZ0 = 0x36 // SHift Zone using reference point
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@ -103,7 +103,7 @@ const (
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opAND = 0x5a // logical AND
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opOR = 0x5b // logical OR
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opNOT = 0x5c // logical NOT
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opDELTAP1 = 0x5d
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opDELTAP1 = 0x5d // DELTA exception P1
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opSDB = 0x5e // Set Delta Base in the graphics state
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opSDS = 0x5f // Set Delta Shift in the graphics state
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opADD = 0x60 // ADD
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@ -123,8 +123,8 @@ const (
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opNROUND10 = 0x6e // .
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opNROUND11 = 0x6f // .
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opWCVTF = 0x70
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opDELTAP2 = 0x71
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opDELTAP3 = 0x72
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opDELTAP2 = 0x71 // DELTA exception P2
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opDELTAP3 = 0x72 // DELTA exception P3
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opDELTAC1 = 0x73
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opDELTAC2 = 0x74
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opDELTAC3 = 0x75
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@ -274,11 +274,11 @@ var popCount = [256]uint8{
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0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, q, // 0x00 - 0x0f
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1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f
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1, 1, 0, 2, 0, 1, 1, q, q, q, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f
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0, 0, q, q, q, q, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
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0, 0, 0, 0, q, q, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
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0, 0, 2, 1, 2, 1, 1, 1, q, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f
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2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, q, 1, 1, // 0x50 - 0x5f
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2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f
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2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
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q, q, q, q, q, q, 1, 1, 2, 2, 0, q, 0, 0, 1, 1, // 0x70 - 0x7f
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q, 1, 1, q, q, q, 1, 1, 2, 2, 0, q, 0, 0, 1, 1, // 0x70 - 0x7f
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q, q, q, q, q, 1, q, q, 1, 1, 3, 2, 2, 1, q, q, // 0x80 - 0x8f
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x90 - 0x9f
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xa0 - 0xaf
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@ -253,7 +253,7 @@ var scalingTestCases = []struct {
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}{
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{"luxisr", 12, -1},
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{"x-arial-bold", 11, 0},
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{"x-deja-vu-sans-oblique", 17, 5},
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{"x-deja-vu-sans-oblique", 17, 14},
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{"x-droid-sans-japanese", 9, 0},
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{"x-times-new-roman", 13, 0},
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}
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