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 "MinikinSkia.h"
18
19 #include <SkPaint.h>
20 #include <SkTypeface.h>
21 #include <cutils/log.h>
22
23 namespace android {
24
MinikinFontSkia(SkTypeface * typeface,const void * fontData,size_t fontSize,int ttcIndex)25 MinikinFontSkia::MinikinFontSkia(SkTypeface* typeface, const void* fontData, size_t fontSize,
26 int ttcIndex) :
27 MinikinFont(typeface->uniqueID()), mTypeface(typeface), mFontData(fontData),
28 mFontSize(fontSize), mTtcIndex(ttcIndex) {
29 }
30
~MinikinFontSkia()31 MinikinFontSkia::~MinikinFontSkia() {
32 SkSafeUnref(mTypeface);
33 }
34
MinikinFontSkia_SetSkiaPaint(const MinikinFont * font,SkPaint * skPaint,const MinikinPaint & paint)35 static void MinikinFontSkia_SetSkiaPaint(const MinikinFont* font, SkPaint* skPaint, const MinikinPaint& paint) {
36 skPaint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
37 skPaint->setTextSize(paint.size);
38 skPaint->setTextScaleX(paint.scaleX);
39 skPaint->setTextSkewX(paint.skewX);
40 MinikinFontSkia::unpackPaintFlags(skPaint, paint.paintFlags);
41 // Apply font fakery on top of user-supplied flags.
42 MinikinFontSkia::populateSkPaint(skPaint, font, paint.fakery);
43 }
44
GetHorizontalAdvance(uint32_t glyph_id,const MinikinPaint & paint) const45 float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id,
46 const MinikinPaint &paint) const {
47 SkPaint skPaint;
48 uint16_t glyph16 = glyph_id;
49 SkScalar skWidth;
50 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
51 skPaint.getTextWidths(&glyph16, sizeof(glyph16), &skWidth, NULL);
52 #ifdef VERBOSE
53 ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth);
54 #endif
55 return skWidth;
56 }
57
GetBounds(MinikinRect * bounds,uint32_t glyph_id,const MinikinPaint & paint) const58 void MinikinFontSkia::GetBounds(MinikinRect* bounds, uint32_t glyph_id,
59 const MinikinPaint& paint) const {
60 SkPaint skPaint;
61 uint16_t glyph16 = glyph_id;
62 SkRect skBounds;
63 MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
64 skPaint.getTextWidths(&glyph16, sizeof(glyph16), NULL, &skBounds);
65 bounds->mLeft = skBounds.fLeft;
66 bounds->mTop = skBounds.fTop;
67 bounds->mRight = skBounds.fRight;
68 bounds->mBottom = skBounds.fBottom;
69 }
70
GetTable(uint32_t tag,size_t * size,MinikinDestroyFunc * destroy)71 const void* MinikinFontSkia::GetTable(uint32_t tag, size_t* size, MinikinDestroyFunc* destroy) {
72 // we don't have a buffer to the font data, copy to own buffer
73 const size_t tableSize = mTypeface->getTableSize(tag);
74 *size = tableSize;
75 if (tableSize == 0) {
76 return nullptr;
77 }
78 void* buf = malloc(tableSize);
79 if (buf == nullptr) {
80 return nullptr;
81 }
82 mTypeface->getTableData(tag, 0, tableSize, buf);
83 *destroy = free;
84 return buf;
85 }
86
GetSkTypeface() const87 SkTypeface *MinikinFontSkia::GetSkTypeface() const {
88 return mTypeface;
89 }
90
GetFontData() const91 const void* MinikinFontSkia::GetFontData() const {
92 return mFontData;
93 }
94
GetFontSize() const95 size_t MinikinFontSkia::GetFontSize() const {
96 return mFontSize;
97 }
98
GetFontIndex() const99 int MinikinFontSkia::GetFontIndex() const {
100 return mTtcIndex;
101 }
102
packPaintFlags(const SkPaint * paint)103 uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) {
104 uint32_t flags = paint->getFlags();
105 SkPaint::Hinting hinting = paint->getHinting();
106 // select only flags that might affect text layout
107 flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag |
108 SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag |
109 SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag |
110 SkPaint::kVerticalText_Flag);
111 flags |= (hinting << 16);
112 return flags;
113 }
114
unpackPaintFlags(SkPaint * paint,uint32_t paintFlags)115 void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) {
116 paint->setFlags(paintFlags & SkPaint::kAllFlags);
117 paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16));
118 }
119
populateSkPaint(SkPaint * paint,const MinikinFont * font,FontFakery fakery)120 void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) {
121 paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->GetSkTypeface());
122 paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold());
123 if (fakery.isFakeItalic()) {
124 paint->setTextSkewX(paint->getTextSkewX() - 0.25f);
125 }
126 }
127
128 }
129