1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <SkTypeface.h>
18 #include <SkPaint.h>
19
20 #define LOG_TAG "Minikin"
21 #include <cutils/log.h>
22
23 #include "MinikinSkia.h"
24
25 namespace android {
26
MinikinFontSkia(SkTypeface * typeface)27 MinikinFontSkia::MinikinFontSkia(SkTypeface *typeface) :
28 mTypeface(typeface) {
29 }
30
~MinikinFontSkia()31 MinikinFontSkia::~MinikinFontSkia() {
32 SkSafeUnref(mTypeface);
33 }
34
GetGlyph(uint32_t codepoint,uint32_t * glyph) const35 bool MinikinFontSkia::GetGlyph(uint32_t codepoint, uint32_t *glyph) const {
36 SkPaint paint;
37 paint.setTypeface(mTypeface);
38 paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
39 uint16_t glyph16;
40 paint.textToGlyphs(&codepoint, sizeof(codepoint), &glyph16);
41 *glyph = glyph16;
42 return !!glyph16;
43 }
44
MinikinFontSkia_SetSkiaPaint(const MinikinFont * font,SkPaint * skPaint,const MinikinPaint & paint)45 static void MinikinFontSkia_SetSkiaPaint(const MinikinFont* font, SkPaint* skPaint, const MinikinPaint& paint) {
46 skPaint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
47 skPaint->setTextSize(paint.size);
48 skPaint->setTextScaleX(paint.scaleX);
49 skPaint->setTextSkewX(paint.skewX);
50 MinikinFontSkia::unpackPaintFlags(skPaint, paint.paintFlags);
51 // Apply font fakery on top of user-supplied flags.
52 MinikinFontSkia::populateSkPaint(skPaint, font, paint.fakery);
53 }
54
GetHorizontalAdvance(uint32_t glyph_id,const MinikinPaint & paint) const55 float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id,
56 const MinikinPaint &paint) const {
57 SkPaint skPaint;
58 uint16_t glyph16 = glyph_id;
59 SkScalar skWidth;
60 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
61 skPaint.getTextWidths(&glyph16, sizeof(glyph16), &skWidth, NULL);
62 #ifdef VERBOSE
63 ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth);
64 #endif
65 return skWidth;
66 }
67
GetBounds(MinikinRect * bounds,uint32_t glyph_id,const MinikinPaint & paint) const68 void MinikinFontSkia::GetBounds(MinikinRect* bounds, uint32_t glyph_id,
69 const MinikinPaint& paint) const {
70 SkPaint skPaint;
71 uint16_t glyph16 = glyph_id;
72 SkRect skBounds;
73 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
74 skPaint.getTextWidths(&glyph16, sizeof(glyph16), NULL, &skBounds);
75 bounds->mLeft = skBounds.fLeft;
76 bounds->mTop = skBounds.fTop;
77 bounds->mRight = skBounds.fRight;
78 bounds->mBottom = skBounds.fBottom;
79 }
80
GetTable(uint32_t tag,uint8_t * buf,size_t * size)81 bool MinikinFontSkia::GetTable(uint32_t tag, uint8_t *buf, size_t *size) {
82 if (buf == NULL) {
83 const size_t tableSize = mTypeface->getTableSize(tag);
84 *size = tableSize;
85 return tableSize != 0;
86 } else {
87 const size_t actualSize = mTypeface->getTableData(tag, 0, *size, buf);
88 *size = actualSize;
89 return actualSize != 0;
90 }
91 }
92
GetSkTypeface() const93 SkTypeface *MinikinFontSkia::GetSkTypeface() const {
94 return mTypeface;
95 }
96
GetUniqueId() const97 int32_t MinikinFontSkia::GetUniqueId() const {
98 return mTypeface->uniqueID();
99 }
100
packPaintFlags(const SkPaint * paint)101 uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) {
102 uint32_t flags = paint->getFlags();
103 SkPaint::Hinting hinting = paint->getHinting();
104 // select only flags that might affect text layout
105 flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag |
106 SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag |
107 SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag |
108 SkPaint::kVerticalText_Flag);
109 flags |= (hinting << 16);
110 return flags;
111 }
112
unpackPaintFlags(SkPaint * paint,uint32_t paintFlags)113 void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) {
114 paint->setFlags(paintFlags & SkPaint::kAllFlags);
115 paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16));
116 }
117
populateSkPaint(SkPaint * paint,const MinikinFont * font,FontFakery fakery)118 void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) {
119 paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->GetSkTypeface());
120 paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold());
121 if (fakery.isFakeItalic()) {
122 paint->setTextSkewX(paint->getTextSkewX() - 0.25f);
123 }
124 }
125
126 }
127