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freetype/truetype: implement the remaining opcodes.

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R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/51760043
This commit is contained in:
Nigel Tao 2014-01-20 14:33:40 +11:00
parent 10cb3b4280
commit 39b0167875
2 changed files with 40 additions and 13 deletions
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28
freetype/truetype/hint.go
View File

@ -419,6 +419,25 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
top--
}
case opALIGNPTS:
top -= 2
p := h.point(1, current, h.stack[top])
q := h.point(0, current, h.stack[top+1])
if p == nil || q == nil {
return errors.New("truetype: hinting: point out of range")
}
d := dotProduct(f26dot6(q.X-p.X), f26dot6(q.Y-p.Y), h.gs.pv) / 2
h.move(p, +d, true)
h.move(q, -d, true)
case opUTP:
top--
p := h.point(0, current, h.stack[top])
if p == nil {
return errors.New("truetype: hinting: point out of range")
}
p.Flags &^= flagTouchedX | flagTouchedY
case opLOOPCALL, opCALL:
if callStackTop >= len(callStack) {
return errors.New("truetype: hinting: call stack overflow")
@ -1087,6 +1106,15 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
// We do not support dropout control, as we always rasterize grayscale glyphs.
top--
case opINSTCTRL:
// TODO: support instruction execution control? It seems rare, and even when
// nominally used (e.g. Source Sans Pro), it seems conditional on extreme or
// unusual rasterization conditions. For example, the code snippet at
// https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html#INSTCTRL
// uses INSTCTRL when grid-fitting a rotated or stretched glyph, but
// freetype-go does not support rotated or stretched glyphs.
top -= 2
case opPUSHB000, opPUSHB001, opPUSHB010, opPUSHB011,
opPUSHB100, opPUSHB101, opPUSHB110, opPUSHB111:

25
freetype/truetype/opcodes.go
View File

@ -5,9 +5,8 @@
package truetype
// The Truetype opcodes are summarized at https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
// TODO: the opXXX constants without end-of-line comments are not yet implemented.
// The Truetype opcodes are summarized at
// https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
const (
opSVTCA0 = 0x00 // Set freedom and projection Vectors To Coordinate Axis
@ -49,9 +48,9 @@ const (
opDEPTH = 0x24 // DEPTH of the stack
opCINDEX = 0x25 // Copy the INDEXed element to the top of the stack
opMINDEX = 0x26 // Move the INDEXed element to the top of the stack
opALIGNPTS = 0x27
op_0x28 = 0x28
opUTP = 0x29
opALIGNPTS = 0x27 // ALIGN PoinTS
op_0x28 = 0x28 // deprecated
opUTP = 0x29 // UnTouch Point
opLOOPCALL = 0x2a // LOOP and CALL function
opCALL = 0x2b // CALL function
opFDEF = 0x2c // Function DEFinition
@ -133,7 +132,7 @@ const (
opJROT = 0x78 // Jump Relative On True
opJROF = 0x79 // Jump Relative On False
opROFF = 0x7a // Round OFF
op_0x7b = 0x7b
op_0x7b = 0x7b // deprecated
opRUTG = 0x7c // Round Up To Grid
opRDTG = 0x7d // Round Down To Grid
opSANGW = 0x7e // Set ANGle Weight
@ -141,8 +140,8 @@ const (
opFLIPPT = 0x80 // FLIP PoinT
opFLIPRGON = 0x81 // FLIP RanGe ON
opFLIPRGOFF = 0x82 // FLIP RanGe OFF
op_0x83 = 0x83
op_0x84 = 0x84
op_0x83 = 0x83 // deprecated
op_0x84 = 0x84 // deprecated
opSCANCTRL = 0x85 // SCAN conversion ConTRoL
opSDPVTL0 = 0x86 // Set Dual Projection Vector To Line
opSDPVTL1 = 0x87 // .
@ -152,7 +151,7 @@ const (
opMAX = 0x8b // MAXimum of top two stack elements
opMIN = 0x8c // MINimum of top two stack elements
opSCANTYPE = 0x8d // SCANTYPE
opINSTCTRL = 0x8e
opINSTCTRL = 0x8e // INSTRuction execution ConTRoL
op_0x8f = 0x8f
op_0x90 = 0x90
op_0x91 = 0x91
@ -273,13 +272,13 @@ 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, 2, 2, 2, 2, 2, 2, 0, 0, 0, 5, // 0x00 - 0x0f
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, 1, 1, // 0x20 - 0x2f
1, 1, 0, 2, 0, 1, 1, 2, 0, 1, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f
0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
0, 0, 2, 1, 2, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f
2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f
2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, q, 0, 0, 1, 1, // 0x70 - 0x7f
0, 2, 2, q, q, 1, 2, 2, 1, 1, 3, 2, 2, 1, q, q, // 0x80 - 0x8f
2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 1, 1, // 0x70 - 0x7f
0, 2, 2, 0, 0, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 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