1aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien/* 2aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * Copyright (c) 2012 Google Inc. All rights reserved. 3aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * 4aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * Redistribution and use in source and binary forms, with or without 5aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * modification, are permitted provided that the following conditions are 6aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * met: 7aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * 8aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * * Redistributions of source code must retain the above copyright 9aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * notice, this list of conditions and the following disclaimer. 10aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * * Redistributions in binary form must reproduce the above 11aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * copyright notice, this list of conditions and the following disclaimer 12aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * in the documentation and/or other materials provided with the 13aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * distribution. 14aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * * Neither the name of Google Inc. nor the names of its 15aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * contributors may be used to endorse or promote products derived from 16aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * this software without specific prior written permission. 17aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * 18aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien */ 30aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 31aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#define LOG_TAG "TextLayoutCache" 32aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 33aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include "HarfBuzzNGFaceSkia.h" 34aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 35aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <cutils/log.h> 36aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkFontHost.h> 37aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkPaint.h> 38aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkPath.h> 39aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkPoint.h> 40aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkRect.h> 41aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <SkUtils.h> 42aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 43aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien#include <hb.h> 44aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 45aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Leviennamespace android { 46aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 47aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien// Our implementation of the callbacks which Harfbuzz requires by using Skia 48aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien// calls. See the Harfbuzz source for references about what these callbacks do. 49aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 50aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstruct HarfBuzzFontData { 51aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HarfBuzzFontData(SkPaint* paint) : m_paint(paint) { } 52aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkPaint* m_paint; 53aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien}; 54aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 55aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic void SkiaGetGlyphWidthAndExtents(SkPaint* paint, hb_codepoint_t codepoint, hb_position_t* width, hb_glyph_extents_t* extents) 56aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 57aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien ALOG_ASSERT(codepoint <= 0xFFFF); 58aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding); 59aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 60aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkScalar skWidth; 61aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkRect skBounds; 62aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien uint16_t glyph = codepoint; 63aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 64aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien paint->getTextWidths(&glyph, sizeof(glyph), &skWidth, &skBounds); 653f32a313db6f765e743bee0693febfff6eb95c75Jeff Sharkey#if DEBUG_GLYPHS 66aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien ALOGD("returned glyph for %i: width = %f", codepoint, skWidth); 673f32a313db6f765e743bee0693febfff6eb95c75Jeff Sharkey#endif 68aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (width) 69aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien *width = SkScalarToHBFixed(skWidth); 70aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (extents) { 71aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // Invert y-axis because Skia is y-grows-down but we set up harfbuzz to be y-grows-up. 72aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien extents->x_bearing = SkScalarToHBFixed(skBounds.fLeft); 73aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien extents->y_bearing = SkScalarToHBFixed(-skBounds.fTop); 74aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien extents->width = SkScalarToHBFixed(skBounds.width()); 75aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien extents->height = SkScalarToHBFixed(-skBounds.height()); 76aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien } 77aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 78aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 79aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic hb_bool_t harfbuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData) 80aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 81aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData); 82aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 83aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (unicode > 0x10ffff) { 84aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien unicode = 0xfffd; 85aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien } 86aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkPaint* paint = hbFontData->m_paint; 87aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // It would be better to use kUTF32_TextEncoding directly 88aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien paint->setTextEncoding(SkPaint::kUTF16_TextEncoding); 89aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien uint16_t glyph16; 90aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien uint16_t unichar[2]; 91aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien size_t size = SkUTF16_FromUnichar(unicode, unichar); 92aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien paint->textToGlyphs(unichar, size * sizeof(*unichar), &glyph16); 93aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien *glyph = glyph16; 94aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return !!*glyph; 95aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 96aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 97aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData) 98aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 99aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData); 100aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_position_t advance = 0; 101aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 102aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkiaGetGlyphWidthAndExtents(hbFontData->m_paint, glyph, &advance, 0); 103aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return advance; 104aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 105aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 106aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic hb_bool_t harfbuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData) 107aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 108aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // Just return true, following the way that Harfbuzz-FreeType 109aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // implementation does. 110aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return true; 111aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 112aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 113aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic hb_bool_t harfbuzzGetGlyphExtents(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_glyph_extents_t* extents, void* userData) 114aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 115aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData); 116aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 117aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkiaGetGlyphWidthAndExtents(hbFontData->m_paint, glyph, 0, extents); 118aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return true; 119aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 120aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 121aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic hb_font_funcs_t* harfbuzzSkiaGetFontFuncs() 122aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 123aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien static hb_font_funcs_t* harfbuzzSkiaFontFuncs = 0; 124aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 125aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // We don't set callback functions which we can't support. 126aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // Harfbuzz will use the fallback implementation if they aren't set. 127aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (!harfbuzzSkiaFontFuncs) { 128aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien harfbuzzSkiaFontFuncs = hb_font_funcs_create(); 129aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_funcs_set_glyph_func(harfbuzzSkiaFontFuncs, harfbuzzGetGlyph, 0, 0); 130aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_funcs_set_glyph_h_advance_func(harfbuzzSkiaFontFuncs, harfbuzzGetGlyphHorizontalAdvance, 0, 0); 131aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_funcs_set_glyph_h_origin_func(harfbuzzSkiaFontFuncs, harfbuzzGetGlyphHorizontalOrigin, 0, 0); 132aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_funcs_set_glyph_extents_func(harfbuzzSkiaFontFuncs, harfbuzzGetGlyphExtents, 0, 0); 133aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_funcs_make_immutable(harfbuzzSkiaFontFuncs); 134aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien } 135aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return harfbuzzSkiaFontFuncs; 136aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 137aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 138aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienhb_blob_t* harfbuzzSkiaReferenceTable(hb_face_t* face, hb_tag_t tag, void* userData) 139aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien{ 140aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien SkTypeface* typeface = reinterpret_cast<SkTypeface*>(userData); 141aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 142109109cdd5004789d5caf6da743986f26cb54e7bDerek Sollenberger const size_t tableSize = typeface->getTableSize(tag); 143aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (!tableSize) 144aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return 0; 145aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 146aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien char* buffer = reinterpret_cast<char*>(malloc(tableSize)); 147aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (!buffer) 148aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return 0; 149109109cdd5004789d5caf6da743986f26cb54e7bDerek Sollenberger size_t actualSize = typeface->getTableData(tag, 0, tableSize, buffer); 150aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien if (tableSize != actualSize) { 151aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien free(buffer); 152aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return 0; 153aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien } 154aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 155aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return hb_blob_create(const_cast<char*>(buffer), tableSize, 156aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HB_MEMORY_MODE_WRITABLE, buffer, free); 157aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 158aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 159aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienstatic void destroyHarfBuzzFontData(void* data) { 160aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien delete (HarfBuzzFontData*)data; 161aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 162aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 163aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levienhb_font_t* createFont(hb_face_t* face, SkPaint* paint, float sizeX, float sizeY) { 164aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_t* font = hb_font_create(face); 165aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 166aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien // Note: this needs to be reworked when we do subpixels 167aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien int x_ppem = floor(sizeX + 0.5); 168aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien int y_ppem = floor(sizeY + 0.5); 169aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_set_ppem(font, x_ppem, y_ppem); 170aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_set_scale(font, HBFloatToFixed(sizeX), HBFloatToFixed(sizeY)); 171aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 172aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien HarfBuzzFontData* data = new HarfBuzzFontData(paint); 173aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien hb_font_set_funcs(font, harfbuzzSkiaGetFontFuncs(), data, destroyHarfBuzzFontData); 174aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 175aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien return font; 176aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} 177aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien 178aaedde51b76901ff05f2a2348eb41f0f5323d954Raph Levien} // namespace android 179