reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/sgl/SkColorTable.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkBitmap.h" |
| 19 | #include "SkFlattenable.h" |
| 20 | #include "SkStream.h" |
| 21 | #include "SkTemplates.h" |
| 22 | |
| 23 | SkColorTable::SkColorTable(int count) |
| 24 | : f16BitCache(NULL), fFlags(0) |
| 25 | { |
| 26 | if (count < 0) |
| 27 | count = 0; |
| 28 | else if (count > 256) |
| 29 | count = 256; |
| 30 | |
| 31 | fCount = SkToU16(count); |
| 32 | fColors = (SkPMColor*)sk_malloc_throw(count * sizeof(SkPMColor)); |
| 33 | memset(fColors, 0, count * sizeof(SkPMColor)); |
| 34 | |
| 35 | SkDEBUGCODE(fColorLockCount = 0;) |
| 36 | SkDEBUGCODE(f16BitCacheLockCount = 0;) |
| 37 | } |
| 38 | |
| 39 | SkColorTable::SkColorTable(const SkPMColor colors[], int count) |
| 40 | : f16BitCache(NULL), fFlags(0) |
| 41 | { |
| 42 | if (count < 0) |
| 43 | count = 0; |
| 44 | else if (count > 256) |
| 45 | count = 256; |
| 46 | |
| 47 | fCount = SkToU16(count); |
| 48 | fColors = (SkPMColor*)sk_malloc_throw(count * sizeof(SkPMColor)); |
| 49 | |
| 50 | if (colors) |
| 51 | memcpy(fColors, colors, count * sizeof(SkPMColor)); |
| 52 | |
| 53 | SkDEBUGCODE(fColorLockCount = 0;) |
| 54 | SkDEBUGCODE(f16BitCacheLockCount = 0;) |
| 55 | } |
| 56 | |
| 57 | SkColorTable::~SkColorTable() |
| 58 | { |
| 59 | SkASSERT(fColorLockCount == 0); |
| 60 | SkASSERT(f16BitCacheLockCount == 0); |
| 61 | |
| 62 | sk_free(fColors); |
| 63 | sk_free(f16BitCache); |
| 64 | } |
| 65 | |
| 66 | void SkColorTable::setFlags(unsigned flags) |
| 67 | { |
| 68 | fFlags = SkToU8(flags); |
| 69 | } |
| 70 | |
| 71 | void SkColorTable::unlockColors(bool changed) |
| 72 | { |
| 73 | SkASSERT(fColorLockCount != 0); |
| 74 | SkDEBUGCODE(fColorLockCount -= 1;) |
| 75 | if (changed) |
| 76 | this->inval16BitCache(); |
| 77 | } |
| 78 | |
| 79 | void SkColorTable::inval16BitCache() |
| 80 | { |
| 81 | SkASSERT(f16BitCacheLockCount == 0); |
| 82 | if (f16BitCache) |
| 83 | { |
| 84 | sk_free(f16BitCache); |
| 85 | f16BitCache = NULL; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | #include "SkColorPriv.h" |
| 90 | |
| 91 | static inline void build_16bitcache(uint16_t dst[], const SkPMColor src[], int count) |
| 92 | { |
| 93 | while (--count >= 0) |
| 94 | *dst++ = SkPixel32ToPixel16_ToU16(*src++); |
| 95 | } |
| 96 | |
| 97 | const uint16_t* SkColorTable::lock16BitCache() |
| 98 | { |
| 99 | if (fFlags & kColorsAreOpaque_Flag) |
| 100 | { |
| 101 | if (f16BitCache == NULL) // build the cache |
| 102 | { |
| 103 | f16BitCache = (uint16_t*)sk_malloc_throw(fCount * sizeof(uint16_t)); |
| 104 | build_16bitcache(f16BitCache, fColors, fCount); |
| 105 | } |
| 106 | } |
| 107 | else // our colors have alpha, so no cache |
| 108 | { |
| 109 | this->inval16BitCache(); |
| 110 | if (f16BitCache) |
| 111 | { |
| 112 | sk_free(f16BitCache); |
| 113 | f16BitCache = NULL; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | SkDEBUGCODE(f16BitCacheLockCount += 1); |
| 118 | return f16BitCache; |
| 119 | } |
| 120 | |
| 121 | /////////////////////////////////////////////////////////////////////////////// |
| 122 | |
| 123 | SkColorTable::SkColorTable(SkFlattenableReadBuffer& buffer) { |
| 124 | f16BitCache = NULL; |
| 125 | SkDEBUGCODE(fColorLockCount = 0;) |
| 126 | SkDEBUGCODE(f16BitCacheLockCount = 0;) |
| 127 | |
| 128 | fCount = buffer.readU16(); |
| 129 | SkASSERT((unsigned)fCount <= 256); |
| 130 | |
| 131 | fFlags = buffer.readU8(); |
| 132 | |
| 133 | fColors = (SkPMColor*)sk_malloc_throw(fCount * sizeof(SkPMColor)); |
| 134 | buffer.read(fColors, fCount * sizeof(SkPMColor)); |
| 135 | } |
| 136 | |
| 137 | void SkColorTable::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 138 | int count = this->count(); |
| 139 | buffer.write16(count); |
| 140 | buffer.write8(this->getFlags()); |
| 141 | buffer.writeMul4(fColors, count * sizeof(SkPMColor)); |
| 142 | } |
| 143 | |