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      1 /*
      2  * Copyright (C) 2006-2009 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 "SkBitmap.h"
     18 #include "SkFlattenable.h"
     19 #include "SkStream.h"
     20 #include "SkTemplates.h"
     21 
     22 SkColorTable::SkColorTable(int count)
     23     : f16BitCache(NULL), fFlags(0)
     24 {
     25     if (count < 0)
     26         count = 0;
     27     else if (count > 256)
     28         count = 256;
     29 
     30     fCount = SkToU16(count);
     31     fColors = (SkPMColor*)sk_malloc_throw(count * sizeof(SkPMColor));
     32     memset(fColors, 0, count * sizeof(SkPMColor));
     33 
     34     SkDEBUGCODE(fColorLockCount = 0;)
     35     SkDEBUGCODE(f16BitCacheLockCount = 0;)
     36 }
     37 
     38 // call SkRefCnt's constructor explicitly, to avoid warning
     39 SkColorTable::SkColorTable(const SkColorTable& src) : SkRefCnt() {
     40     f16BitCache = NULL;
     41     fFlags = src.fFlags;
     42     int count = src.count();
     43     fCount = SkToU16(count);
     44     fColors = reinterpret_cast<SkPMColor*>(
     45                                     sk_malloc_throw(count * sizeof(SkPMColor)));
     46     memcpy(fColors, src.fColors, count * sizeof(SkPMColor));
     47 
     48     SkDEBUGCODE(fColorLockCount = 0;)
     49     SkDEBUGCODE(f16BitCacheLockCount = 0;)
     50 }
     51 
     52 SkColorTable::SkColorTable(const SkPMColor colors[], int count)
     53     : f16BitCache(NULL), fFlags(0)
     54 {
     55     if (count < 0)
     56         count = 0;
     57     else if (count > 256)
     58         count = 256;
     59 
     60     fCount = SkToU16(count);
     61     fColors = reinterpret_cast<SkPMColor*>(
     62                                     sk_malloc_throw(count * sizeof(SkPMColor)));
     63 
     64     if (colors)
     65         memcpy(fColors, colors, count * sizeof(SkPMColor));
     66 
     67     SkDEBUGCODE(fColorLockCount = 0;)
     68     SkDEBUGCODE(f16BitCacheLockCount = 0;)
     69 }
     70 
     71 SkColorTable::~SkColorTable()
     72 {
     73     SkASSERT(fColorLockCount == 0);
     74     SkASSERT(f16BitCacheLockCount == 0);
     75 
     76     sk_free(fColors);
     77     sk_free(f16BitCache);
     78 }
     79 
     80 void SkColorTable::setFlags(unsigned flags)
     81 {
     82     fFlags = SkToU8(flags);
     83 }
     84 
     85 void SkColorTable::unlockColors(bool changed)
     86 {
     87     SkASSERT(fColorLockCount != 0);
     88     SkDEBUGCODE(fColorLockCount -= 1;)
     89     if (changed)
     90         this->inval16BitCache();
     91 }
     92 
     93 void SkColorTable::inval16BitCache()
     94 {
     95     SkASSERT(f16BitCacheLockCount == 0);
     96     if (f16BitCache)
     97     {
     98         sk_free(f16BitCache);
     99         f16BitCache = NULL;
    100     }
    101 }
    102 
    103 #include "SkColorPriv.h"
    104 
    105 static inline void build_16bitcache(uint16_t dst[], const SkPMColor src[], int count)
    106 {
    107     while (--count >= 0)
    108         *dst++ = SkPixel32ToPixel16_ToU16(*src++);
    109 }
    110 
    111 const uint16_t* SkColorTable::lock16BitCache()
    112 {
    113     if (fFlags & kColorsAreOpaque_Flag)
    114     {
    115         if (f16BitCache == NULL) // build the cache
    116         {
    117             f16BitCache = (uint16_t*)sk_malloc_throw(fCount * sizeof(uint16_t));
    118             build_16bitcache(f16BitCache, fColors, fCount);
    119         }
    120     }
    121     else    // our colors have alpha, so no cache
    122     {
    123         this->inval16BitCache();
    124         if (f16BitCache)
    125         {
    126             sk_free(f16BitCache);
    127             f16BitCache = NULL;
    128         }
    129     }
    130 
    131     SkDEBUGCODE(f16BitCacheLockCount += 1);
    132     return f16BitCache;
    133 }
    134 
    135 void SkColorTable::setIsOpaque(bool isOpaque) {
    136     if (isOpaque) {
    137         fFlags |= kColorsAreOpaque_Flag;
    138     } else {
    139         fFlags &= ~kColorsAreOpaque_Flag;
    140     }
    141 }
    142 
    143 ///////////////////////////////////////////////////////////////////////////////
    144 
    145 SkColorTable::SkColorTable(SkFlattenableReadBuffer& buffer) {
    146     f16BitCache = NULL;
    147     SkDEBUGCODE(fColorLockCount = 0;)
    148     SkDEBUGCODE(f16BitCacheLockCount = 0;)
    149 
    150     fCount = buffer.readU16();
    151     SkASSERT((unsigned)fCount <= 256);
    152 
    153     fFlags = buffer.readU8();
    154 
    155     fColors = (SkPMColor*)sk_malloc_throw(fCount * sizeof(SkPMColor));
    156     buffer.read(fColors, fCount * sizeof(SkPMColor));
    157 }
    158 
    159 void SkColorTable::flatten(SkFlattenableWriteBuffer& buffer) const {
    160     int count = this->count();
    161     buffer.write16(count);
    162     buffer.write8(this->getFlags());
    163     buffer.writeMul4(fColors, count * sizeof(SkPMColor));
    164 }
    165 
    166