michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Mozilla Foundation
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "cairo.h"
michael@0: #include "cairo-ft.h"
michael@0: 
michael@0: #include "SkFontHost_FreeType_common.h"
michael@0: 
michael@0: #include "SkAdvancedTypefaceMetrics.h"
michael@0: #include "SkFontHost.h"
michael@0: #include "SkPath.h"
michael@0: #include "SkScalerContext.h"
michael@0: #include "SkTypefaceCache.h"
michael@0: 
michael@0: #include <ft2build.h>
michael@0: #include FT_FREETYPE_H
michael@0: 
michael@0: #ifndef SK_FONTHOST_CAIRO_STANDALONE
michael@0: #define SK_FONTHOST_CAIRO_STANDALONE 1
michael@0: #endif
michael@0: 
michael@0: static cairo_user_data_key_t kSkTypefaceKey;
michael@0: 
michael@0: class SkScalerContext_CairoFT : public SkScalerContext_FreeType_Base {
michael@0: public:
michael@0:     SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc);
michael@0:     virtual ~SkScalerContext_CairoFT();
michael@0: 
michael@0: protected:
michael@0:     virtual unsigned generateGlyphCount() SK_OVERRIDE;
michael@0:     virtual uint16_t generateCharToGlyph(SkUnichar uniChar) SK_OVERRIDE;
michael@0:     virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;
michael@0:     virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;
michael@0:     virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE;
michael@0:     virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;
michael@0:     virtual void generateFontMetrics(SkPaint::FontMetrics* mx,
michael@0:                                      SkPaint::FontMetrics* my) SK_OVERRIDE;
michael@0:     virtual SkUnichar generateGlyphToChar(uint16_t glyph) SK_OVERRIDE;
michael@0: private:
michael@0:     cairo_scaled_font_t* fScaledFont;
michael@0:     uint32_t fLoadGlyphFlags;
michael@0: };
michael@0: 
michael@0: class CairoLockedFTFace {
michael@0: public:
michael@0:     CairoLockedFTFace(cairo_scaled_font_t* scaledFont)
michael@0:         : fScaledFont(scaledFont)
michael@0:         , fFace(cairo_ft_scaled_font_lock_face(scaledFont))
michael@0:     {}
michael@0: 
michael@0:     ~CairoLockedFTFace()
michael@0:     {
michael@0:         cairo_ft_scaled_font_unlock_face(fScaledFont);
michael@0:     }
michael@0: 
michael@0:     FT_Face getFace()
michael@0:     {
michael@0:         return fFace;
michael@0:     }
michael@0: 
michael@0: private:
michael@0:     cairo_scaled_font_t* fScaledFont;
michael@0:     FT_Face fFace;
michael@0: };
michael@0: 
michael@0: class SkCairoFTTypeface : public SkTypeface {
michael@0: public:
michael@0:     static SkTypeface* CreateTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth) {
michael@0:         SkASSERT(fontFace != NULL);
michael@0:         SkASSERT(cairo_font_face_get_type(fontFace) == CAIRO_FONT_TYPE_FT);
michael@0: 
michael@0:         SkFontID newId = SkTypefaceCache::NewFontID();
michael@0: 
michael@0:         return SkNEW_ARGS(SkCairoFTTypeface, (fontFace, style, newId, isFixedWidth));
michael@0:     }
michael@0: 
michael@0:     cairo_font_face_t* getFontFace() {
michael@0:         return fFontFace;
michael@0:     }
michael@0: 
michael@0:     virtual SkStream* onOpenStream(int*) const SK_OVERRIDE { return NULL; }
michael@0: 
michael@0:     virtual SkAdvancedTypefaceMetrics*
michael@0:         onGetAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::PerGlyphInfo,
michael@0:                                      const uint32_t*, uint32_t) const SK_OVERRIDE
michael@0:     {
michael@0:         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetAdvancedTypefaceMetrics unimplemented\n"));
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     virtual SkScalerContext* onCreateScalerContext(const SkDescriptor* desc) const SK_OVERRIDE
michael@0:     {
michael@0:         return SkNEW_ARGS(SkScalerContext_CairoFT, (const_cast<SkCairoFTTypeface*>(this), desc));
michael@0:     }
michael@0: 
michael@0:     virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE
michael@0:     {
michael@0:         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onFilterRec unimplemented\n"));
michael@0:     }
michael@0: 
michael@0:     virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE
michael@0:     {
michael@0:         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetFontDescriptor unimplemented\n"));
michael@0:     }
michael@0: 
michael@0:     virtual int onCharsToGlyphs(void const*, SkTypeface::Encoding, uint16_t*, int) const SK_OVERRIDE
michael@0:     {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     virtual int onCountGlyphs() const SK_OVERRIDE
michael@0:     {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     virtual int onGetUPEM() const SK_OVERRIDE
michael@0:     {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE
michael@0:     {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     virtual int onGetTableTags(SkFontTableTag*) const SK_OVERRIDE
michael@0:     {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     virtual size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const SK_OVERRIDE
michael@0:     {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0: private:
michael@0: 
michael@0:     SkCairoFTTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, SkFontID id, bool isFixedWidth)
michael@0:         : SkTypeface(style, id, isFixedWidth)
michael@0:         , fFontFace(fontFace)
michael@0:     {
michael@0:         cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, this, NULL);
michael@0:         cairo_font_face_reference(fFontFace);
michael@0:     }
michael@0: 
michael@0:     ~SkCairoFTTypeface()
michael@0:     {
michael@0:         cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, NULL, NULL);
michael@0:         cairo_font_face_destroy(fFontFace);
michael@0:     }
michael@0: 
michael@0:     cairo_font_face_t* fFontFace;
michael@0: };
michael@0: 
michael@0: SkTypeface* SkCreateTypefaceFromCairoFont(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth)
michael@0: {
michael@0:     SkTypeface* typeface = reinterpret_cast<SkTypeface*>(cairo_font_face_get_user_data(fontFace, &kSkTypefaceKey));
michael@0: 
michael@0:     if (typeface) {
michael@0:         typeface->ref();
michael@0:     } else {
michael@0:         typeface = SkCairoFTTypeface::CreateTypeface(fontFace, style, isFixedWidth);
michael@0:         SkTypefaceCache::Add(typeface, style);
michael@0:     }
michael@0: 
michael@0:     return typeface;
michael@0: }
michael@0: 
michael@0: #if defined(SK_FONTHOST_DOES_NOT_USE_FONTMGR) && SK_FONTHOST_CAIRO_STANDALONE
michael@0: SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
michael@0:                                      const char famillyName[],
michael@0:                                      SkTypeface::Style style)
michael@0: {
michael@0:     SkDEBUGFAIL("SkFontHost::FindTypeface unimplemented");
michael@0:     return NULL;
michael@0: }
michael@0: 
michael@0: SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream*)
michael@0: {
michael@0:     SkDEBUGFAIL("SkFontHost::CreateTypeface unimplemented");
michael@0:     return NULL;
michael@0: }
michael@0: 
michael@0: SkTypeface* SkFontHost::CreateTypefaceFromFile(char const*)
michael@0: {
michael@0:     SkDEBUGFAIL("SkFontHost::CreateTypefaceFromFile unimplemented");
michael@0:     return NULL;
michael@0: }
michael@0: #endif
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: static bool isLCD(const SkScalerContext::Rec& rec) {
michael@0:     switch (rec.fMaskFormat) {
michael@0:         case SkMask::kLCD16_Format:
michael@0:         case SkMask::kLCD32_Format:
michael@0:             return true;
michael@0:         default:
michael@0:             return false;
michael@0:     }
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: SkScalerContext_CairoFT::SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc)
michael@0:     : SkScalerContext_FreeType_Base(typeface, desc)
michael@0: {
michael@0:     SkMatrix matrix;
michael@0:     fRec.getSingleMatrix(&matrix);
michael@0: 
michael@0:     cairo_font_face_t* fontFace = static_cast<SkCairoFTTypeface*>(typeface)->getFontFace();
michael@0: 
michael@0:     cairo_matrix_t fontMatrix, ctMatrix;
michael@0:     cairo_matrix_init(&fontMatrix, matrix.getScaleX(), matrix.getSkewY(), matrix.getSkewX(), matrix.getScaleY(), 0.0, 0.0);
michael@0:     cairo_matrix_init_scale(&ctMatrix, 1.0, 1.0);
michael@0: 
michael@0:     // We need to ensure that the font options match for hinting, as generateMetrics()
michael@0:     // uses the fScaledFont which uses these font options
michael@0:     cairo_font_options_t *fontOptions = cairo_font_options_create();
michael@0: 
michael@0:     FT_Int32 loadFlags = FT_LOAD_DEFAULT;
michael@0: 
michael@0:     if (SkMask::kBW_Format == fRec.fMaskFormat) {
michael@0:         // See http://code.google.com/p/chromium/issues/detail?id=43252#c24
michael@0:         loadFlags = FT_LOAD_TARGET_MONO;
michael@0:         if (fRec.getHinting() == SkPaint::kNo_Hinting) {
michael@0:             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);
michael@0:             loadFlags = FT_LOAD_NO_HINTING;
michael@0:         }
michael@0:     } else {
michael@0:         switch (fRec.getHinting()) {
michael@0:         case SkPaint::kNo_Hinting:
michael@0:             loadFlags = FT_LOAD_NO_HINTING;
michael@0:             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);
michael@0:             break;
michael@0:         case SkPaint::kSlight_Hinting:
michael@0:             loadFlags = FT_LOAD_TARGET_LIGHT;  // This implies FORCE_AUTOHINT
michael@0:             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_SLIGHT);
michael@0:             break;
michael@0:         case SkPaint::kNormal_Hinting:
michael@0:             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_MEDIUM);
michael@0:             if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) {
michael@0:                 loadFlags = FT_LOAD_FORCE_AUTOHINT;
michael@0:             }
michael@0:             break;
michael@0:         case SkPaint::kFull_Hinting:
michael@0:             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_FULL);
michael@0:             if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) {
michael@0:                 loadFlags = FT_LOAD_FORCE_AUTOHINT;
michael@0:             }
michael@0:             if (isLCD(fRec)) {
michael@0:                 if (SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag)) {
michael@0:                     loadFlags = FT_LOAD_TARGET_LCD_V;
michael@0:                 } else {
michael@0:                     loadFlags = FT_LOAD_TARGET_LCD;
michael@0:                 }
michael@0:             }
michael@0:             break;
michael@0:         default:
michael@0:             SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting());
michael@0:             break;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     fScaledFont = cairo_scaled_font_create(fontFace, &fontMatrix, &ctMatrix, fontOptions);
michael@0: 
michael@0:     if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) {
michael@0:         loadFlags |= FT_LOAD_NO_BITMAP;
michael@0:     }
michael@0: 
michael@0:     // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct
michael@0:     // advances, as fontconfig and cairo do.
michael@0:     // See http://code.google.com/p/skia/issues/detail?id=222.
michael@0:     loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
michael@0: 
michael@0:     fLoadGlyphFlags = loadFlags;
michael@0: }
michael@0: 
michael@0: SkScalerContext_CairoFT::~SkScalerContext_CairoFT()
michael@0: {
michael@0:     cairo_scaled_font_destroy(fScaledFont);
michael@0: }
michael@0: 
michael@0: unsigned SkScalerContext_CairoFT::generateGlyphCount()
michael@0: {
michael@0:     CairoLockedFTFace faceLock(fScaledFont);
michael@0:     return faceLock.getFace()->num_glyphs;
michael@0: }
michael@0: 
michael@0: uint16_t SkScalerContext_CairoFT::generateCharToGlyph(SkUnichar uniChar)
michael@0: {
michael@0:     CairoLockedFTFace faceLock(fScaledFont);
michael@0:     return SkToU16(FT_Get_Char_Index(faceLock.getFace(), uniChar));
michael@0: }
michael@0: 
michael@0: void SkScalerContext_CairoFT::generateAdvance(SkGlyph* glyph)
michael@0: {
michael@0:     generateMetrics(glyph);
michael@0: }
michael@0: 
michael@0: void SkScalerContext_CairoFT::generateMetrics(SkGlyph* glyph)
michael@0: {
michael@0:     SkASSERT(fScaledFont != NULL);
michael@0:     cairo_text_extents_t extents;
michael@0:     cairo_glyph_t cairoGlyph = { glyph->getGlyphID(fBaseGlyphCount), 0.0, 0.0 };
michael@0:     cairo_scaled_font_glyph_extents(fScaledFont, &cairoGlyph, 1, &extents);
michael@0: 
michael@0:     glyph->fAdvanceX = SkDoubleToFixed(extents.x_advance);
michael@0:     glyph->fAdvanceY = SkDoubleToFixed(extents.y_advance);
michael@0:     glyph->fWidth = SkToU16(SkScalarCeilToInt(extents.width));
michael@0:     glyph->fHeight = SkToU16(SkScalarCeilToInt(extents.height));
michael@0:     glyph->fLeft = SkToS16(SkScalarCeilToInt(extents.x_bearing));
michael@0:     glyph->fTop = SkToS16(SkScalarCeilToInt(extents.y_bearing));
michael@0:     glyph->fLsbDelta = 0;
michael@0:     glyph->fRsbDelta = 0;
michael@0: }
michael@0: 
michael@0: void SkScalerContext_CairoFT::generateImage(const SkGlyph& glyph)
michael@0: {
michael@0:     SkASSERT(fScaledFont != NULL);
michael@0:     CairoLockedFTFace faceLock(fScaledFont);
michael@0:     FT_Face face = faceLock.getFace();
michael@0: 
michael@0:     FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags);
michael@0: 
michael@0:     if (err != 0) {
michael@0:         memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     generateGlyphImage(face, glyph);
michael@0: }
michael@0: 
michael@0: void SkScalerContext_CairoFT::generatePath(const SkGlyph& glyph, SkPath* path)
michael@0: {
michael@0:     SkASSERT(fScaledFont != NULL);
michael@0:     CairoLockedFTFace faceLock(fScaledFont);
michael@0:     FT_Face face = faceLock.getFace();
michael@0: 
michael@0:     SkASSERT(&glyph && path);
michael@0: 
michael@0:     uint32_t flags = fLoadGlyphFlags;
michael@0:     flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline
michael@0:     flags &= ~FT_LOAD_RENDER;   // don't scan convert (we just want the outline)
michael@0: 
michael@0:     FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), flags);
michael@0: 
michael@0:     if (err != 0) {
michael@0:         path->reset();
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     generateGlyphPath(face, path);
michael@0: }
michael@0: 
michael@0: void SkScalerContext_CairoFT::generateFontMetrics(SkPaint::FontMetrics* mx,
michael@0:                                                   SkPaint::FontMetrics* my)
michael@0: {
michael@0:     SkDEBUGCODE(SkDebugf("SkScalerContext_CairoFT::generateFontMetrics unimplemented\n"));
michael@0: }
michael@0: 
michael@0: SkUnichar SkScalerContext_CairoFT::generateGlyphToChar(uint16_t glyph)
michael@0: {
michael@0:     SkASSERT(fScaledFont != NULL);
michael@0:     CairoLockedFTFace faceLock(fScaledFont);
michael@0:     FT_Face face = faceLock.getFace();
michael@0: 
michael@0:     FT_UInt glyphIndex;
michael@0:     SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex);
michael@0:     while (glyphIndex != 0) {
michael@0:         if (glyphIndex == glyph) {
michael@0:             return charCode;
michael@0:         }
michael@0:         charCode = FT_Get_Next_Char(face, charCode, &glyphIndex);
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: #include "SkFontMgr.h"
michael@0: 
michael@0: SkFontMgr* SkFontMgr::Factory() {
michael@0:     // todo
michael@0:     return NULL;
michael@0: }
michael@0: