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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <Carbon/Carbon.h>
#include "SkFontHost.h"
#include "SkDescriptor.h"
#include "SkEndian.h"
#include "SkFloatingPoint.h"
#include "SkPaint.h"
#include "SkPoint.h"
const char* gDefaultfont = "Arial"; // hard code for now
SK_DECLARE_STATIC_MUTEX(gFTMutex);
static inline SkPoint F32PtToSkPoint(const Float32Point p) {
SkPoint sp = { SkFloatToScalar(p.x), SkFloatToScalar(p.y) };
return sp;
}
static inline uint32_t _rotl(uint32_t v, uint32_t r) {
return (v << r | v >> (32 - r));
}
class SkTypeface_Mac : public SkTypeface {
public:
SkTypeface_Mac(SkTypeface::Style style, uint32_t id)
: SkTypeface(style, id) {}
};
#pragma mark -
static uint32_t find_from_name(const char name[]) {
CFStringRef str = CFStringCreateWithCString(NULL, name,
kCFStringEncodingUTF8);
uint32_t fontID = ::ATSFontFindFromName(str, kATSOptionFlagsDefault);
CFRelease(str);
return fontID;
}
static uint32_t find_default_fontID() {
static const char* gDefaultNames[] = { "Arial", "Tahoma", "Helvetica" };
uint32_t fontID;
for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); i++) {
fontID = find_from_name(gDefaultNames[i]);
if (fontID) {
return fontID;
}
}
sk_throw();
return 0;
}
static SkTypeface* CreateTypeface_(const char name[], SkTypeface::Style style) {
uint32_t fontID = 0;
if (NULL != name) {
fontID = find_from_name(name);
}
if (0 == fontID) {
fontID = find_default_fontID();
}
// we lie (for now) and report that we found the exact style bits
return new SkTypeface_Mac(style, fontID);
}
#pragma mark -
class SkScalerContext_Mac : public SkScalerContext {
public:
SkScalerContext_Mac(const SkDescriptor* desc);
virtual ~SkScalerContext_Mac();
protected:
virtual unsigned generateGlyphCount();
virtual uint16_t generateCharToGlyph(SkUnichar uni);
virtual void generateAdvance(SkGlyph* glyph);
virtual void generateMetrics(SkGlyph* glyph);
virtual void generateImage(const SkGlyph& glyph);
virtual void generatePath(const SkGlyph& glyph, SkPath* path);
virtual void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY);
private:
ATSUTextLayout fLayout;
ATSUStyle fStyle;
CGColorSpaceRef fGrayColorSpace;
CGAffineTransform fTransform;
static OSStatus MoveTo(const Float32Point *pt, void *cb);
static OSStatus Line(const Float32Point *pt, void *cb);
static OSStatus Curve(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *cb);
static OSStatus Close(void *cb);
};
void SkFontHost::FilterRec(SkScalerContext::Rec* rec) {
// we only support 2 levels of hinting
SkPaint::Hinting h = rec->getHinting();
if (SkPaint::kSlight_Hinting == h) {
h = SkPaint::kNo_Hinting;
} else if (SkPaint::kFull_Hinting == h) {
h = SkPaint::kNormal_Hinting;
}
rec->setHinting(h);
// we don't support LCD text
if (SkMask::kLCD16_Format == rec->fMaskFormat ||
SkMask::kLCD32_Format == rec->fMaskFormat) {
rec->fMaskFormat = SkMask::kA8_Format;
}
}
SkScalerContext_Mac::SkScalerContext_Mac(const SkDescriptor* desc)
: SkScalerContext(desc), fLayout(0), fStyle(0)
{
SkAutoMutexAcquire ac(gFTMutex);
OSStatus err;
err = ::ATSUCreateStyle(&fStyle);
SkASSERT(0 == err);
SkMatrix m;
fRec.getSingleMatrix(&m);
fTransform = CGAffineTransformMake(SkScalarToFloat(m[SkMatrix::kMScaleX]),
SkScalarToFloat(m[SkMatrix::kMSkewX]),
SkScalarToFloat(m[SkMatrix::kMSkewY]),
SkScalarToFloat(m[SkMatrix::kMScaleY]),
SkScalarToFloat(m[SkMatrix::kMTransX]),
SkScalarToFloat(m[SkMatrix::kMTransY]));
ATSStyleRenderingOptions renderOpts = kATSStyleApplyAntiAliasing;
switch (fRec.getHinting()) {
case SkPaint::kNo_Hinting:
case SkPaint::kSlight_Hinting:
renderOpts |= kATSStyleNoHinting;
break;
case SkPaint::kNormal_Hinting:
case SkPaint::kFull_Hinting:
renderOpts |= kATSStyleApplyHints;
break;
}
ATSUFontID fontID = FMGetFontFromATSFontRef(fRec.fFontID);
// we put everything in the matrix, so our pt size is just 1.0
Fixed fixedSize = SK_Fixed1;
static const ATSUAttributeTag tags[] = {
kATSUFontTag, kATSUSizeTag, kATSUFontMatrixTag, kATSUStyleRenderingOptionsTag
};
static const ByteCount sizes[] = {
sizeof(fontID), sizeof(fixedSize), sizeof(fTransform), sizeof(renderOpts)
};
const ATSUAttributeValuePtr values[] = {
&fontID, &fixedSize, &fTransform, &renderOpts
};
err = ::ATSUSetAttributes(fStyle, SK_ARRAY_COUNT(tags),
tags, sizes, values);
SkASSERT(0 == err);
err = ::ATSUCreateTextLayout(&fLayout);
SkASSERT(0 == err);
fGrayColorSpace = ::CGColorSpaceCreateDeviceGray();
}
SkScalerContext_Mac::~SkScalerContext_Mac() {
::CGColorSpaceRelease(fGrayColorSpace);
::ATSUDisposeTextLayout(fLayout);
::ATSUDisposeStyle(fStyle);
}
// man, we need to consider caching this, since it is just dependent on
// fFontID, and not on any of the other settings like matrix or flags
unsigned SkScalerContext_Mac::generateGlyphCount() {
// The 'maxp' table stores the number of glyphs a offset 4, in 2 bytes
uint16_t numGlyphs;
if (SkFontHost::GetTableData(fRec.fFontID,
SkSetFourByteTag('m', 'a', 'x', 'p'),
4, 2, &numGlyphs) != 2) {
return 0xFFFF;
}
return SkEndian_SwapBE16(numGlyphs);
}
uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni)
{
SkAutoMutexAcquire ac(gFTMutex);
OSStatus err;
UniChar achar = uni;
err = ::ATSUSetTextPointerLocation(fLayout,&achar,0,1,1);
err = ::ATSUSetRunStyle(fLayout,fStyle,kATSUFromTextBeginning,kATSUToTextEnd);
ATSLayoutRecord *layoutPtr;
ItemCount count;
ATSGlyphRef glyph;
err = ::ATSUDirectGetLayoutDataArrayPtrFromTextLayout(fLayout,0,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr,&count);
glyph = layoutPtr->glyphID;
::ATSUDirectReleaseLayoutDataArrayPtr(NULL,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr);
return glyph;
}
static void set_glyph_metrics_on_error(SkGlyph* glyph) {
glyph->fRsbDelta = 0;
glyph->fLsbDelta = 0;
glyph->fWidth = 0;
glyph->fHeight = 0;
glyph->fTop = 0;
glyph->fLeft = 0;
glyph->fAdvanceX = 0;
glyph->fAdvanceY = 0;
}
void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
this->generateMetrics(glyph);
}
void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) {
GlyphID glyphID = glyph->getGlyphID(fBaseGlyphCount);
ATSGlyphScreenMetrics screenMetrics;
ATSGlyphIdealMetrics idealMetrics;
OSStatus err = ATSUGlyphGetScreenMetrics(fStyle, 1, &glyphID, 0, true, true,
&screenMetrics);
if (noErr != err) {
set_glyph_metrics_on_error(glyph);
return;
}
err = ATSUGlyphGetIdealMetrics(fStyle, 1, &glyphID, 0, &idealMetrics);
if (noErr != err) {
set_glyph_metrics_on_error(glyph);
return;
}
if ((fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) == 0) {
glyph->fAdvanceX = SkFloatToFixed(screenMetrics.deviceAdvance.x);
glyph->fAdvanceY = -SkFloatToFixed(screenMetrics.deviceAdvance.y);
} else {
glyph->fAdvanceX = SkFloatToFixed(idealMetrics.advance.x);
glyph->fAdvanceY = -SkFloatToFixed(idealMetrics.advance.y);
}
// specify an extra 1-pixel border, go tive CG room for its antialiasing
// i.e. without this, I was seeing some edges chopped off!
glyph->fWidth = screenMetrics.width + 2;
glyph->fHeight = screenMetrics.height + 2;
glyph->fLeft = sk_float_round2int(screenMetrics.topLeft.x) - 1;
glyph->fTop = -sk_float_round2int(screenMetrics.topLeft.y) - 1;
}
void SkScalerContext_Mac::generateImage(const SkGlyph& glyph)
{
SkAutoMutexAcquire ac(gFTMutex);
SkASSERT(fLayout);
sk_bzero(glyph.fImage, glyph.fHeight * glyph.rowBytes());
CGContextRef contextRef = ::CGBitmapContextCreate(glyph.fImage,
glyph.fWidth, glyph.fHeight, 8,
glyph.rowBytes(), fGrayColorSpace,
kCGImageAlphaNone);
if (!contextRef) {
SkASSERT(false);
return;
}
::CGContextSetGrayFillColor(contextRef, 1.0, 1.0);
::CGContextSetTextDrawingMode(contextRef, kCGTextFill);
CGGlyph glyphID = glyph.getGlyphID(fBaseGlyphCount);
CGFontRef fontRef = CGFontCreateWithPlatformFont(&fRec.fFontID);
CGContextSetFont(contextRef, fontRef);
CGContextSetFontSize(contextRef, 1);
CGContextSetTextMatrix(contextRef, fTransform);
CGContextShowGlyphsAtPoint(contextRef, -glyph.fLeft,
glyph.fTop + glyph.fHeight, &glyphID, 1);
::CGContextRelease(contextRef);
}
#if 0
static void convert_metrics(SkPaint::FontMetrics* dst,
const ATSFontMetrics& src) {
dst->fTop = -SkFloatToScalar(src.ascent);
dst->fAscent = -SkFloatToScalar(src.ascent);
dst->fDescent = SkFloatToScalar(src.descent);
dst->fBottom = SkFloatToScalar(src.descent);
dst->fLeading = SkFloatToScalar(src.leading);
}
#endif
static void* get_font_table(ATSFontRef fontID, uint32_t tag) {
ByteCount size;
OSStatus err = ATSFontGetTable(fontID, tag, 0, 0, NULL, &size);
if (err) {
return NULL;
}
void* data = sk_malloc_throw(size);
err = ATSFontGetTable(fontID, tag, 0, size, data, &size);
if (err) {
sk_free(data);
data = NULL;
}
return data;
}
static int get_be16(const void* data, size_t offset) {
const char* ptr = reinterpret_cast<const char*>(data);
uint16_t value = *reinterpret_cast<const uint16_t*>(ptr + offset);
int n = SkEndian_SwapBE16(value);
// now force it to be signed
return n << 16 >> 16;
}
#define SFNT_HEAD_UPEM_OFFSET 18
#define SFNT_HEAD_YMIN_OFFSET 38
#define SFNT_HEAD_YMAX_OFFSET 42
#define SFNT_HEAD_STYLE_OFFSET 44
#define SFNT_HHEA_ASCENT_OFFSET 4
#define SFNT_HHEA_DESCENT_OFFSET 6
#define SFNT_HHEA_LEADING_OFFSET 8
static bool init_vertical_metrics(ATSFontRef font, SkPoint pts[5]) {
void* head = get_font_table(font, 'head');
if (NULL == head) {
return false;
}
void* hhea = get_font_table(font, 'hhea');
if (NULL == hhea) {
sk_free(head);
return false;
}
int upem = get_be16(head, SFNT_HEAD_UPEM_OFFSET);
int ys[5];
ys[0] = -get_be16(head, SFNT_HEAD_YMAX_OFFSET);
ys[1] = -get_be16(hhea, SFNT_HHEA_ASCENT_OFFSET);
ys[2] = -get_be16(hhea, SFNT_HHEA_DESCENT_OFFSET);
ys[3] = -get_be16(head, SFNT_HEAD_YMIN_OFFSET);
ys[4] = get_be16(hhea, SFNT_HHEA_LEADING_OFFSET);
// now do some cleanup, to ensure y[max,min] are really that
if (ys[0] > ys[1]) {
ys[0] = ys[1];
}
if (ys[3] < ys[2]) {
ys[3] = ys[2];
}
for (int i = 0; i < 5; i++) {
pts[i].set(0, SkIntToScalar(ys[i]) / upem);
}
sk_free(hhea);
sk_free(head);
return true;
}
void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* mx,
SkPaint::FontMetrics* my) {
SkPoint pts[5];
if (!init_vertical_metrics(fRec.fFontID, pts)) {
// these are not as accurate as init_vertical_metrics :(
ATSFontMetrics metrics;
ATSFontGetVerticalMetrics(fRec.fFontID, kATSOptionFlagsDefault,
&metrics);
pts[0].set(0, -SkFloatToScalar(metrics.ascent));
pts[1].set(0, -SkFloatToScalar(metrics.ascent));
pts[2].set(0, -SkFloatToScalar(metrics.descent));
pts[3].set(0, -SkFloatToScalar(metrics.descent));
pts[4].set(0, SkFloatToScalar(metrics.leading)); //+ or -?
}
SkMatrix m;
fRec.getSingleMatrix(&m);
m.mapPoints(pts, 5);
if (mx) {
mx->fTop = pts[0].fX;
mx->fAscent = pts[1].fX;
mx->fDescent = pts[2].fX;
mx->fBottom = pts[3].fX;
mx->fLeading = pts[4].fX;
// FIXME:
mx->fAvgCharWidth = 0;
mx->fXMin = 0;
mx->fXMax = 0;
mx->fXHeight = 0;
}
if (my) {
my->fTop = pts[0].fY;
my->fAscent = pts[1].fY;
my->fDescent = pts[2].fY;
my->fBottom = pts[3].fY;
my->fLeading = pts[4].fY;
// FIXME:
my->fAvgCharWidth = 0;
my->fXMin = 0;
my->fXMax = 0;
my->fXHeight = 0;
}
}
void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path)
{
SkAutoMutexAcquire ac(gFTMutex);
OSStatus err,result;
err = ::ATSUGlyphGetCubicPaths(
fStyle,glyph.fID,
&SkScalerContext_Mac::MoveTo,
&SkScalerContext_Mac::Line,
&SkScalerContext_Mac::Curve,
&SkScalerContext_Mac::Close,
path,&result);
SkASSERT(err == noErr);
}
OSStatus SkScalerContext_Mac::MoveTo(const Float32Point *pt, void *cb)
{
reinterpret_cast<SkPath*>(cb)->moveTo(F32PtToSkPoint(*pt));
return noErr;
}
OSStatus SkScalerContext_Mac::Line(const Float32Point *pt, void *cb)
{
reinterpret_cast<SkPath*>(cb)->lineTo(F32PtToSkPoint(*pt));
return noErr;
}
OSStatus SkScalerContext_Mac::Curve(const Float32Point *pt1,
const Float32Point *pt2,
const Float32Point *pt3, void *cb)
{
reinterpret_cast<SkPath*>(cb)->cubicTo(F32PtToSkPoint(*pt1),
F32PtToSkPoint(*pt2),
F32PtToSkPoint(*pt3));
return noErr;
}
OSStatus SkScalerContext_Mac::Close(void *cb)
{
reinterpret_cast<SkPath*>(cb)->close();
return noErr;
}
#pragma mark -
void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
SkDEBUGFAIL("SkFontHost::Serialize unimplemented");
}
SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
SkDEBUGFAIL("SkFontHost::Deserialize unimplemented");
return NULL;
}
SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
return NULL;
}
SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
return NULL;
}
// static
SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics(
uint32_t fontID,
SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) {
SkDEBUGFAIL("SkFontHost::GetAdvancedTypefaceMetrics unimplemented");
return NULL;
}
SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
return new SkScalerContext_Mac(desc);
}
SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
uint32_t newFontID = find_default_fontID();
if (newFontID == currFontID) {
newFontID = 0;
}
return newFontID;
}
SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
const char familyName[],
const void* data, size_t bytelength,
SkTypeface::Style style) {
// todo: we don't know how to respect style bits
if (NULL == familyName && NULL != familyFace) {
familyFace->ref();
return const_cast<SkTypeface*>(familyFace);
} else {
return CreateTypeface_(familyName, style);
}
}
///////////////////////////////////////////////////////////////////////////////
struct SkSFNTHeader {
uint32_t fVersion;
uint16_t fNumTables;
uint16_t fSearchRange;
uint16_t fEntrySelector;
uint16_t fRangeShift;
};
struct SkSFNTDirEntry {
uint32_t fTag;
uint32_t fChecksum;
uint32_t fOffset;
uint32_t fLength;
};
struct SfntHeader {
SfntHeader(SkFontID fontID, bool needDir) : fCount(0), fData(NULL) {
ByteCount size;
if (ATSFontGetTableDirectory(fontID, 0, NULL, &size)) {
return;
}
SkAutoMalloc storage(size);
SkSFNTHeader* header = reinterpret_cast<SkSFNTHeader*>(storage.get());
if (ATSFontGetTableDirectory(fontID, size, header, &size)) {
return;
}
fCount = SkEndian_SwapBE16(header->fNumTables);
fData = header;
storage.detach();
}
~SfntHeader() {
sk_free(fData);
}
int count() const { return fCount; }
const SkSFNTDirEntry* entries() const {
return reinterpret_cast<const SkSFNTDirEntry*>
(reinterpret_cast<char*>(fData) + sizeof(SkSFNTHeader));
}
private:
int fCount;
void* fData;
};
int SkFontHost::CountTables(SkFontID fontID) {
SfntHeader header(fontID, false);
return header.count();
}
int SkFontHost::GetTableTags(SkFontID fontID, SkFontTableTag tags[]) {
SfntHeader header(fontID, true);
int count = header.count();
const SkSFNTDirEntry* entry = header.entries();
for (int i = 0; i < count; i++) {
tags[i] = SkEndian_SwapBE32(entry[i].fTag);
}
return count;
}
size_t SkFontHost::GetTableSize(SkFontID fontID, SkFontTableTag tag) {
ByteCount size;
if (ATSFontGetTable(fontID, tag, 0, 0, NULL, &size)) {
return 0;
}
return size;
}
size_t SkFontHost::GetTableData(SkFontID fontID, SkFontTableTag tag,
size_t offset, size_t length, void* data) {
ByteCount size;
if (ATSFontGetTable(fontID, tag, offset, length, data, &size)) {
return 0;
}
if (offset >= size) {
return 0;
}
if (offset + length > size) {
length = size - offset;
}
return length;
}