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1 /*
2  * Copyright (C) 2012 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 #ifndef ANDROID_HWUI_FONT_UTIL_H
18 #define ANDROID_HWUI_FONT_UTIL_H
19 
20 #include <SkUtils.h>
21 
22 #include "Properties.h"
23 
24 ///////////////////////////////////////////////////////////////////////////////
25 // Defines
26 ///////////////////////////////////////////////////////////////////////////////
27 
28 #define DEFAULT_TEXT_SMALL_CACHE_WIDTH 1024
29 #define DEFAULT_TEXT_SMALL_CACHE_HEIGHT 512
30 #define DEFAULT_TEXT_LARGE_CACHE_WIDTH 2048
31 #define DEFAULT_TEXT_LARGE_CACHE_HEIGHT 512
32 
33 #define TEXTURE_BORDER_SIZE 1
34 #if TEXTURE_BORDER_SIZE != 1
35 # error TEXTURE_BORDER_SIZE other than 1 is not currently supported
36 #endif
37 
38 #define CACHE_BLOCK_ROUNDING_SIZE 4
39 
40 #if RENDER_TEXT_AS_GLYPHS
41     typedef uint16_t glyph_t;
42     #define TO_GLYPH(g) g
43     #define GET_METRICS(cache, glyph) cache->getGlyphIDMetrics(glyph)
44     #define GET_GLYPH(text) nextGlyph((const uint16_t**) &text)
45     #define IS_END_OF_STRING(glyph) false
46 
nextGlyph(const uint16_t ** srcPtr)47     static glyph_t nextGlyph(const uint16_t** srcPtr) {
48         const uint16_t* src = *srcPtr;
49         glyph_t g = *src++;
50         *srcPtr = src;
51         return g;
52     }
53 #else
54     typedef SkUnichar glyph_t;
55     #define TO_GLYPH(g) ((SkUnichar) g)
56     #define GET_METRICS(cache, glyph) cache->getUnicharMetrics(glyph)
57     #define GET_GLYPH(text) SkUTF16_NextUnichar((const uint16_t**) &text)
58     #define IS_END_OF_STRING(glyph) glyph < 0
59 #endif
60 
61 #define AUTO_KERN(prev, next) (((next) - (prev) + 32) >> 6 << 16)
62 
63 #endif // ANDROID_HWUI_FONT_UTIL_H
64