freetype/truetype: add explicit graphics state.
These new opcodes aren't unit-tested per se, but they will be exercised by an end-to-end hinting test of the Luxi fonts. R=bsiegert CC=golang-dev https://codereview.appspot.com/12100043
This commit is contained in:
Nigel Tao
parent
e3b4bc4c1f
commit
43c4b0b00d
3 changed files with 198 additions and 100 deletions
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@ -105,8 +105,9 @@ func (g *GlyphBuf) decodeCoords(d []byte, offset int, np0 int) int {
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}
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// Load loads a glyph's contours from a Font, overwriting any previously
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// loaded contours for this GlyphBuf. The Hinter is optional; if non-nil, then
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// the resulting glyph will be hinted by the Font's bytecode instructions.
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// loaded contours for this GlyphBuf. scale is the number of 26.6 fixed point
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// units in 1 em. The Hinter is optional; if non-nil, then the resulting glyph
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// will be hinted by the Font's bytecode instructions.
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func (g *GlyphBuf) Load(f *Font, scale int32, i Index, h *Hinter) error {
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// Reset the GlyphBuf.
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g.B = Bounds{}
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@ -34,17 +34,45 @@ type Hinter struct {
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font *Font
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scale int32
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// The fields below constitue the graphics state, which is described at
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// https://developer.apple.com/fonts/TTRefMan/RM04/Chap4.html
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// gs and defaultGS are the current and default graphics state. The
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// default graphics state is the global default graphics state after
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// the font's fpgm and prep programs have been run.
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gs, defaultGS graphicsState
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}
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// graphicsState is described at https://developer.apple.com/fonts/TTRefMan/RM04/Chap4.html
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type graphicsState struct {
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// Projection vector, freedom vector and dual projection vector.
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pv, fv, dv [2]f2dot14
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// Reference points and zone pointers.
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rp, zp [3]int32
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// Control Value / Single Width Cut-In.
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controlValueCutIn, singleWidthCutIn, singleWidth f26dot6
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// Delta base / shift.
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deltaBase, deltaShift int32
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// Minimum distance.
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minDist f26dot6
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// Loop count.
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loop int32
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// Rounding policy.
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roundPeriod, roundPhase, roundThreshold f26dot6
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// Auto-flip.
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autoFlip bool
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}
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var globalDefaultGS = graphicsState{
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pv: [2]f2dot14{0x4000, 0}, // Unit vector along the X axis.
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fv: [2]f2dot14{0x4000, 0},
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dv: [2]f2dot14{0x4000, 0},
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zp: [3]int32{1, 1, 1},
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controlValueCutIn: (17 << 6) / 16, // 17/16 as an f26dot6.
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deltaBase: 9,
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deltaShift: 3,
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minDist: 1 << 6, // 1 as an f26dot6.
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loop: 1,
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roundPeriod: 1 << 6, // 1 as an f26dot6.
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roundThreshold: 1 << 5, // 1/2 as an f26dot6.
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autoFlip: true,
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}
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func (h *Hinter) init(f *Font, scale int32) error {
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@ -78,28 +106,29 @@ func (h *Hinter) init(f *Font, scale int32) error {
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if rescale {
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h.scale = scale
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h.defaultGS = globalDefaultGS
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if len(f.prep) != 0 {
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if err := h.run(f.prep); err != nil {
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return err
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}
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h.defaultGS = h.gs
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// The MS rasterizer doesn't allow the following graphics state
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// variables to be modified by the CVT program.
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h.defaultGS.pv = globalDefaultGS.pv
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h.defaultGS.fv = globalDefaultGS.fv
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h.defaultGS.dv = globalDefaultGS.dv
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h.defaultGS.rp = globalDefaultGS.rp
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h.defaultGS.zp = globalDefaultGS.zp
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h.defaultGS.loop = globalDefaultGS.loop
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}
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}
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return nil
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}
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func (h *Hinter) run(program []byte) error {
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// The default vectors are along the X axis.
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h.pv = [2]f2dot14{0x4000, 0}
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h.fv = [2]f2dot14{0x4000, 0}
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h.dv = [2]f2dot14{0x4000, 0}
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// The default minimum distance is 1.
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h.minDist = 1 << 6
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// The default loop count is 1.
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h.loop = 1
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// The default rounding policy is round to grid.
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h.roundPeriod = 1 << 6
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h.roundPhase = 0
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h.roundThreshold = 1 << 5
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h.gs = h.defaultGS
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if len(program) > 50000 {
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return errors.New("truetype: hinting: too many instructions")
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@ -127,81 +156,95 @@ func (h *Hinter) run(program []byte) error {
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switch opcode {
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case opSVTCA0:
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h.pv = [2]f2dot14{0, 0x4000}
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h.fv = [2]f2dot14{0, 0x4000}
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// TODO: h.dv = h.pv ??
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h.gs.pv = [2]f2dot14{0, 0x4000}
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h.gs.fv = [2]f2dot14{0, 0x4000}
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// TODO: h.gs.dv = h.gs.pv ??
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case opSVTCA1:
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h.pv = [2]f2dot14{0x4000, 0}
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h.fv = [2]f2dot14{0x4000, 0}
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// TODO: h.dv = h.pv ??
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h.gs.pv = [2]f2dot14{0x4000, 0}
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h.gs.fv = [2]f2dot14{0x4000, 0}
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// TODO: h.gs.dv = h.gs.pv ??
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case opSPVTCA0:
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h.pv = [2]f2dot14{0, 0x4000}
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// TODO: h.dv = h.pv ??
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h.gs.pv = [2]f2dot14{0, 0x4000}
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// TODO: h.gs.dv = h.gs.pv ??
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case opSPVTCA1:
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h.pv = [2]f2dot14{0x4000, 0}
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// TODO: h.dv = h.pv ??
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h.gs.pv = [2]f2dot14{0x4000, 0}
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// TODO: h.gs.dv = h.gs.pv ??
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case opSFVTCA0:
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h.fv = [2]f2dot14{0, 0x4000}
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h.gs.fv = [2]f2dot14{0, 0x4000}
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case opSFVTCA1:
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h.fv = [2]f2dot14{0x4000, 0}
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h.gs.fv = [2]f2dot14{0x4000, 0}
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case opSPVFS:
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top -= 2
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h.pv[0] = f2dot14(h.stack[top+0])
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h.pv[1] = f2dot14(h.stack[top+1])
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// TODO: normalize h.pv ??
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// TODO: h.dv = h.pv ??
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h.gs.pv[0] = f2dot14(h.stack[top+0])
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h.gs.pv[1] = f2dot14(h.stack[top+1])
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// TODO: normalize h.gs.pv ??
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// TODO: h.gs.dv = h.gs.pv ??
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case opSFVFS:
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top -= 2
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h.fv[0] = f2dot14(h.stack[top+0])
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h.fv[1] = f2dot14(h.stack[top+1])
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// TODO: normalize h.fv ??
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h.gs.fv[0] = f2dot14(h.stack[top+0])
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h.gs.fv[1] = f2dot14(h.stack[top+1])
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// TODO: normalize h.gs.fv ??
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case opGPV:
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if top+1 >= 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+0] = int32(h.pv[0])
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h.stack[top+1] = int32(h.pv[1])
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h.stack[top+0] = int32(h.gs.pv[0])
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h.stack[top+1] = int32(h.gs.pv[1])
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top += 2
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case opGFV:
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if top+1 >= 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+0] = int32(h.fv[0])
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h.stack[top+1] = int32(h.fv[1])
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h.stack[top+0] = int32(h.gs.fv[0])
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h.stack[top+1] = int32(h.gs.fv[1])
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top += 2
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case opSFVTPV:
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h.fv = h.pv
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h.gs.fv = h.gs.pv
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case opSRP0, opSRP1, opSRP2:
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top--
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h.gs.rp[opcode-opSRP0] = h.stack[top]
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case opSZP0, opSZP1, opSZP2:
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top--
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h.gs.zp[opcode-opSZP0] = h.stack[top]
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case opSZPS:
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top--
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h.gs.zp[0] = h.stack[top]
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h.gs.zp[1] = h.stack[top]
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h.gs.zp[2] = h.stack[top]
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case opSLOOP:
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top--
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if h.stack[top] <= 0 {
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return errors.New("truetype: hinting: invalid data")
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}
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h.loop = h.stack[top]
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h.gs.loop = h.stack[top]
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case opRTG:
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h.roundPeriod = 1 << 6
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h.roundPhase = 0
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h.roundThreshold = 1 << 5
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h.gs.roundPeriod = 1 << 6
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h.gs.roundPhase = 0
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h.gs.roundThreshold = 1 << 5
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case opRTHG:
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h.roundPeriod = 1 << 6
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h.roundPhase = 1 << 5
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h.roundThreshold = 1 << 5
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h.gs.roundPeriod = 1 << 6
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h.gs.roundPhase = 1 << 5
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h.gs.roundThreshold = 1 << 5
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case opSMD:
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top--
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h.minDist = f26dot6(h.stack[top])
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h.gs.minDist = f26dot6(h.stack[top])
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case opELSE:
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opcode = 1
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@ -212,6 +255,18 @@ func (h *Hinter) run(program []byte) error {
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pc += int(h.stack[top])
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continue
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case opSCVTCI:
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top--
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h.gs.controlValueCutIn = f26dot6(h.stack[top])
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case opSSWCI:
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top--
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h.gs.singleWidthCutIn = f26dot6(h.stack[top])
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case opSSW:
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top--
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h.gs.singleWidth = f26dot6(h.stack[top])
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case opDUP:
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if top >= len(h.stack) {
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return errors.New("truetype: hinting: stack overflow")
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@ -306,9 +361,9 @@ func (h *Hinter) run(program []byte) error {
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program, pc = callStack[callStackTop].program, callStack[callStackTop].pc
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case opRTDG:
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h.roundPeriod = 1 << 5
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h.roundPhase = 0
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h.roundThreshold = 1 << 4
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h.gs.roundPeriod = 1 << 5
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h.gs.roundPhase = 0
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h.gs.roundThreshold = 1 << 4
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case opNPUSHB:
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opcode = 0
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@ -333,6 +388,17 @@ func (h *Hinter) run(program []byte) error {
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}
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h.stack[top-1] = h.store[i]
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case opMPPEM, opMPS:
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if top >= len(h.stack) {
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return errors.New("truetype: hinting: stack overflow")
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}
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// For MPS, point size should be irrelevant; we return the PPEM.
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h.stack[top] = h.scale >> 6
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top++
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case opFLIPON, opFLIPOFF:
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h.gs.autoFlip = opcode == opFLIPON
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case opDEBUG:
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// No-op.
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@ -385,6 +451,14 @@ func (h *Hinter) run(program []byte) error {
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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 opSDB:
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top--
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h.gs.deltaBase = h.stack[top]
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case opSDS:
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top--
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h.gs.deltaShift = h.stack[top]
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case opADD:
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top--
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h.stack[top-1] += h.stack[top]
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@ -435,23 +509,23 @@ func (h *Hinter) run(program []byte) error {
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top--
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switch (h.stack[top] >> 6) & 0x03 {
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case 0:
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h.roundPeriod = 1 << 5
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h.gs.roundPeriod = 1 << 5
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case 1, 3:
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h.roundPeriod = 1 << 6
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h.gs.roundPeriod = 1 << 6
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case 2:
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h.roundPeriod = 1 << 7
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h.gs.roundPeriod = 1 << 7
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}
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if opcode == opS45ROUND {
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// The spec says to multiply by √2, but the C Freetype code says 1/√2.
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// We go with 1/√2.
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h.roundPeriod *= 46341
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h.roundPeriod /= 65536
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h.gs.roundPeriod *= 46341
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h.gs.roundPeriod /= 65536
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}
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h.roundPhase = h.roundPeriod * f26dot6((h.stack[top]>>4)&0x03) / 4
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h.gs.roundPhase = h.gs.roundPeriod * f26dot6((h.stack[top]>>4)&0x03) / 4
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if x := h.stack[top] & 0x0f; x != 0 {
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h.roundThreshold = h.roundPeriod * f26dot6(x-4) / 8
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h.gs.roundThreshold = h.gs.roundPeriod * f26dot6(x-4) / 8
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} else {
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h.roundThreshold = h.roundPeriod - 1
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h.gs.roundThreshold = h.gs.roundPeriod - 1
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}
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case opJROT:
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@ -469,24 +543,43 @@ func (h *Hinter) run(program []byte) error {
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}
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case opROFF:
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h.roundPeriod = 0
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h.roundPhase = 0
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h.roundThreshold = 0
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h.gs.roundPeriod = 0
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h.gs.roundPhase = 0
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h.gs.roundThreshold = 0
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case opRUTG:
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h.roundPeriod = 1 << 6
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h.roundPhase = 0
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h.roundThreshold = 1<<6 - 1
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h.gs.roundPeriod = 1 << 6
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h.gs.roundPhase = 0
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h.gs.roundThreshold = 1<<6 - 1
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case opRDTG:
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h.roundPeriod = 1 << 6
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h.roundPhase = 0
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h.roundThreshold = 0
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h.gs.roundPeriod = 1 << 6
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h.gs.roundPhase = 0
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h.gs.roundThreshold = 0
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case opSANGW, opAA:
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// These ops are "anachronistic" and no longer used.
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top--
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case opSCANCTRL:
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// We do not support dropout control, as we always rasterize grayscale glyphs.
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top--
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case opGETINFO:
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res := int32(0)
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if h.stack[top-1]&(1<<0) != 0 {
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// Set the engine version. We hard-code this to 35, the same as
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// the C freetype code, which says that "Version~35 corresponds
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// to MS rasterizer v.1.7 as used e.g. in Windows~98".
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res |= 35
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}
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if h.stack[top-1]&(1<<5) != 0 {
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// Set that we support grayscale.
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res |= 1 << 12
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}
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// We set no other bits, as we do not support rotated or stretched glyphs.
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h.stack[top-1] = res
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case opIDEF:
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// IDEF is for ancient versions of the bytecode interpreter, and is no longer used.
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return errors.New("truetype: hinting: unsupported IDEF instruction")
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@ -507,6 +600,10 @@ func (h *Hinter) run(program []byte) error {
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h.stack[top-1] = h.stack[top]
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}
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case opSCANTYPE:
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// We do not support dropout control, as we always rasterize grayscale glyphs.
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top--
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case opPUSHB000, opPUSHB001, opPUSHB010, opPUSHB011,
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opPUSHB100, opPUSHB101, opPUSHB110, opPUSHB111:
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@ -646,26 +743,26 @@ func (x f26dot6) mul(y f26dot6) f26dot6 {
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// round rounds the given number. The rounding algorithm is described at
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// https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding
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func (h *Hinter) round(x f26dot6) f26dot6 {
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if h.roundPeriod == 0 {
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if h.gs.roundPeriod == 0 {
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return x
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}
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neg := x < 0
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x -= h.roundPhase
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x += h.roundThreshold
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x -= h.gs.roundPhase
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x += h.gs.roundThreshold
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if x >= 0 {
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x = (x / h.roundPeriod) * h.roundPeriod
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x = (x / h.gs.roundPeriod) * h.gs.roundPeriod
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} else {
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x -= h.roundPeriod
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x -= h.gs.roundPeriod
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x += 1
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x = (x / h.roundPeriod) * h.roundPeriod
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x = (x / h.gs.roundPeriod) * h.gs.roundPeriod
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}
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x += h.roundPhase
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x += h.gs.roundPhase
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if neg {
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if x >= 0 {
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x = h.roundPhase - h.roundPeriod
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x = h.gs.roundPhase - h.gs.roundPeriod
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}
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} else if x < 0 {
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x = h.roundPhase
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x = h.gs.roundPhase
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}
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return x
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}
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@ -26,22 +26,22 @@ const (
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opGFV = 0x0d // Get Freedom Vector
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opSFVTPV = 0x0e // Set Freedom Vector To Projection Vector
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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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||||
opSRP0 = 0x10 // Set Reference Point 0
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||||
opSRP1 = 0x11 // Set Reference Point 1
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||||
opSRP2 = 0x12 // Set Reference Point 2
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||||
opSZP0 = 0x13 // Set Zone Pointer 0
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||||
opSZP1 = 0x14 // Set Zone Pointer 1
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opSZP2 = 0x15 // Set Zone Pointer 2
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||||
opSZPS = 0x16 // Set Zone PointerS
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||||
opSLOOP = 0x17 // Set LOOP variable
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||||
opRTG = 0x18 // Round To Grid
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opRTHG = 0x19 // Round To Half Grid
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||||
opSMD = 0x1a // Set Minimum Distance
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||||
opELSE = 0x1b // ELSE clause
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||||
opJMPR = 0x1c // JuMP Relative
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||||
opSCVTCI = 0x1d
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||||
opSSWCI = 0x1e
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||||
opSSW = 0x1f
|
||||
opSCVTCI = 0x1d // Set Control Value Table Cut-In
|
||||
opSSWCI = 0x1e // Set Single Width Cut-In
|
||||
opSSW = 0x1f // Set Single Width
|
||||
opDUP = 0x20 // DUPlicate top stack element
|
||||
opPOP = 0x21 // POP top stack element
|
||||
opCLEAR = 0x22 // CLEAR the stack
|
||||
|
|
@ -85,10 +85,10 @@ const (
|
|||
opSCFS = 0x48
|
||||
opMD0 = 0x49
|
||||
opMD1 = 0x4a
|
||||
opMPPEM = 0x4b
|
||||
opMPS = 0x4c
|
||||
opFLIPON = 0x4d
|
||||
opFLIPOFF = 0x4e
|
||||
opMPPEM = 0x4b // Measure Pixels Per EM
|
||||
opMPS = 0x4c // Measure Point Size
|
||||
opFLIPON = 0x4d // set the auto FLIP Boolean to ON
|
||||
opFLIPOFF = 0x4e // set the auto FLIP Boolean to OFF
|
||||
opDEBUG = 0x4f // DEBUG call
|
||||
opLT = 0x50 // Less Than
|
||||
opLTEQ = 0x51 // Less Than or EQual
|
||||
|
|
@ -104,8 +104,8 @@ const (
|
|||
opOR = 0x5b // logical OR
|
||||
opNOT = 0x5c // logical NOT
|
||||
opDELTAP1 = 0x5d
|
||||
opSDB = 0x5e
|
||||
opSDS = 0x5f
|
||||
opSDB = 0x5e // Set Delta Base in the graphics state
|
||||
opSDS = 0x5f // Set Delta Shift in the graphics state
|
||||
opADD = 0x60 // ADD
|
||||
opSUB = 0x61 // SUBtract
|
||||
opDIV = 0x62 // DIVide
|
||||
|
|
@ -143,15 +143,15 @@ const (
|
|||
opFLIPRGOFF = 0x82
|
||||
op_0x83 = 0x83
|
||||
op_0x84 = 0x84
|
||||
opSCANCTRL = 0x85
|
||||
opSCANCTRL = 0x85 // SCAN conversion ConTRoL
|
||||
opSDPVTL0 = 0x86
|
||||
opSDPVTL1 = 0x87
|
||||
opGETINFO = 0x88
|
||||
opGETINFO = 0x88 // GET INFOrmation
|
||||
opIDEF = 0x89 // Instruction DEFinition
|
||||
opROLL = 0x8a // ROLL the top three stack elements
|
||||
opMAX = 0x8b // MAXimum of top two stack elements
|
||||
opMIN = 0x8c // MINimum of top two stack elements
|
||||
opSCANTYPE = 0x8d
|
||||
opSCANTYPE = 0x8d // SCANTYPE
|
||||
opINSTCTRL = 0x8e
|
||||
op_0x8f = 0x8f
|
||||
op_0x90 = 0x90
|
||||
|
|
@ -272,14 +272,14 @@ const (
|
|||
var popCount = [256]uint8{
|
||||
// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
|
||||
0, 0, 0, 0, 0, 0, q, q, q, q, 2, 2, 0, 0, 0, q, // 0x00 - 0x0f
|
||||
q, q, q, q, q, q, q, 1, 0, 0, 1, 0, 1, q, q, q, // 0x10 - 0x1f
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f
|
||||
1, 1, 0, 2, 0, 1, 1, q, q, q, 2, 1, 1, 0, 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, 1, 1, 1, 0, 2, 2, 1, q, q, q, // 0x50 - 0x5f
|
||||
0, 0, 2, 1, q, q, q, q, q, q, q, 0, 0, 0, 0, 0, // 0x40 - 0x4f
|
||||
2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, q, 1, 1, // 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
|
||||
q, q, q, q, q, 1, q, q, 1, 1, 3, 2, 2, 1, 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
|
||||
|
|
|
|||
Loading…
Reference in a new issue