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 #ifdef TEXTURE_BORDER_SIZE
34   #if TEXTURE_BORDER_SIZE != 1
35     #error TEXTURE_BORDER_SIZE other than 1 is not currently supported
36   #endif
37 #else
38   #define TEXTURE_BORDER_SIZE 1
39 #endif
40 
41 #define CACHE_BLOCK_ROUNDING_SIZE 4
42 
43 #if RENDER_TEXT_AS_GLYPHS
44     typedef uint16_t glyph_t;
45     #define TO_GLYPH(g) g
46     #define GET_METRICS(cache, glyph) cache->getGlyphIDMetrics(glyph)
47     #define GET_GLYPH(text) nextGlyph((const uint16_t**) &text)
48     #define IS_END_OF_STRING(glyph) false
49 
nextGlyph(const uint16_t ** srcPtr)50     static inline glyph_t nextGlyph(const uint16_t** srcPtr) {
51         const uint16_t* src = *srcPtr;
52         glyph_t g = *src++;
53         *srcPtr = src;
54         return g;
55     }
56 #else
57     typedef SkUnichar glyph_t;
58     #define TO_GLYPH(g) ((SkUnichar) g)
59     #define GET_METRICS(cache, glyph) cache->getUnicharMetrics(glyph)
60     #define GET_GLYPH(text) SkUTF16_NextUnichar((const uint16_t**) &text)
61     #define IS_END_OF_STRING(glyph) glyph < 0
62 #endif
63 
64 #define AUTO_KERN(prev, next) (((next) - (prev) + 32) >> 6 << 16)
65 
66 #endif // ANDROID_HWUI_FONT_UTIL_H
67