SkTableColorFilter.cpp revision fbfcd5602128ec010c82cb733c9cdc0a3254f9f3 
1
2#include "SkBitmap.h"
3#include "SkTableColorFilter.h"
4#include "SkColorPriv.h"
5#include "SkFlattenableBuffers.h"
6#include "SkUnPreMultiply.h"
7
8class SkTable_ColorFilter : public SkColorFilter {
9public:
10    SkTable_ColorFilter(const uint8_t tableA[], const uint8_t tableR[],
11                        const uint8_t tableG[], const uint8_t tableB[]) {
12        fBitmap = NULL;
13        fFlags = 0;
14
15        uint8_t* dst = fStorage;
16        if (tableA) {
17            memcpy(dst, tableA, 256);
18            dst += 256;
19            fFlags |= kA_Flag;
20        }
21        if (tableR) {
22            memcpy(dst, tableR, 256);
23            dst += 256;
24            fFlags |= kR_Flag;
25        }
26        if (tableG) {
27            memcpy(dst, tableG, 256);
28            dst += 256;
29            fFlags |= kG_Flag;
30        }
31        if (tableB) {
32            memcpy(dst, tableB, 256);
33            fFlags |= kB_Flag;
34        }
35    }
36
37    virtual ~SkTable_ColorFilter() {
38        SkDELETE(fBitmap);
39    }
40
41    virtual bool asComponentTable(SkBitmap* table) SK_OVERRIDE;
42
43    virtual void filterSpan(const SkPMColor src[], int count,
44                            SkPMColor dst[]) SK_OVERRIDE;
45
46    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTable_ColorFilter)
47
48protected:
49    SkTable_ColorFilter(SkFlattenableReadBuffer& buffer);
50    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
51
52private:
53    SkBitmap* fBitmap;
54
55    enum {
56        kA_Flag = 1 << 0,
57        kR_Flag = 1 << 1,
58        kG_Flag = 1 << 2,
59        kB_Flag = 1 << 3,
60    };
61    uint8_t fStorage[256 * 4];
62    unsigned fFlags;
63
64    typedef SkColorFilter INHERITED;
65};
66
67static const uint8_t gIdentityTable[] = {
68    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
69    0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
70    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
71    0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
72    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
73    0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
74    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
75    0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
76    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
77    0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
78    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
79    0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
80    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
81    0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
82    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
83    0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
84    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
85    0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
86    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
87    0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
88    0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
89    0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
90    0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
91    0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
92    0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
93    0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
94    0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
95    0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
96    0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
97    0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
98    0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
99    0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
100};
101
102void SkTable_ColorFilter::filterSpan(const SkPMColor src[], int count,
103                                     SkPMColor dst[]) {
104    const uint8_t* table = fStorage;
105    const uint8_t* tableA = gIdentityTable;
106    const uint8_t* tableR = gIdentityTable;
107    const uint8_t* tableG = gIdentityTable;
108    const uint8_t* tableB = gIdentityTable;
109    if (fFlags & kA_Flag) {
110        tableA = table; table += 256;
111    }
112    if (fFlags & kR_Flag) {
113        tableR = table; table += 256;
114    }
115    if (fFlags & kG_Flag) {
116        tableG = table; table += 256;
117    }
118    if (fFlags & kB_Flag) {
119        tableB = table;
120    }
121
122    const SkUnPreMultiply::Scale* scaleTable = SkUnPreMultiply::GetScaleTable();
123    for (int i = 0; i < count; ++i) {
124        SkPMColor c = src[i];
125        unsigned a, r, g, b;
126        if (0 == c) {
127            a = r = g = b = 0;
128        } else {
129            a = SkGetPackedA32(c);
130            r = SkGetPackedR32(c);
131            g = SkGetPackedG32(c);
132            b = SkGetPackedB32(c);
133
134            if (a < 255) {
135                SkUnPreMultiply::Scale scale = scaleTable[a];
136                r = SkUnPreMultiply::ApplyScale(scale, r);
137                g = SkUnPreMultiply::ApplyScale(scale, g);
138                b = SkUnPreMultiply::ApplyScale(scale, b);
139            }
140        }
141        dst[i] = SkPremultiplyARGBInline(tableA[a], tableR[r],
142                                         tableG[g], tableB[b]);
143    }
144}
145
146static const uint8_t gCountNibBits[] = {
147    0, 1, 1, 2,
148    1, 2, 2, 3,
149    1, 2, 2, 3,
150    2, 3, 3, 4
151};
152
153#include "SkPackBits.h"
154
155void SkTable_ColorFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
156    this->INHERITED::flatten(buffer);
157
158    uint8_t storage[5*256];
159    int count = gCountNibBits[fFlags & 0xF];
160    size_t size = SkPackBits::Pack8(fStorage, count * 256, storage);
161    SkASSERT(size <= sizeof(storage));
162
163//    SkDebugf("raw %d packed %d\n", count * 256, size);
164
165    buffer.writeInt(fFlags);
166    buffer.writeByteArray(storage, size);
167}
168
169SkTable_ColorFilter::SkTable_ColorFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
170    fBitmap = NULL;
171
172    uint8_t storage[5*256];
173
174    fFlags = buffer.readInt();
175
176    size_t size = buffer.getArrayCount();
177    SkASSERT(size <= sizeof(storage));
178    buffer.readByteArray(storage);
179
180    size_t raw = SkPackBits::Unpack8(storage, size, fStorage);
181
182    SkASSERT(raw <= sizeof(fStorage));
183    size_t count = gCountNibBits[fFlags & 0xF];
184    SkASSERT(raw == count * 256);
185}
186
187bool SkTable_ColorFilter::asComponentTable(SkBitmap* table) {
188    if (table) {
189        if (NULL == fBitmap) {
190            fBitmap = SkNEW(SkBitmap);
191            fBitmap->setConfig(SkBitmap::kA8_Config, 256, 4, 256);
192            fBitmap->allocPixels();
193            uint8_t* bitmapPixels = fBitmap->getAddr8(0, 0);
194            int offset = 0;
195            static const unsigned kFlags[] = { kA_Flag, kR_Flag, kG_Flag, kB_Flag };
196
197            for (int x = 0; x < 4; ++x) {
198                if (!(fFlags & kFlags[x])) {
199                    memcpy(bitmapPixels, gIdentityTable, sizeof(gIdentityTable));
200                } else {
201                    memcpy(bitmapPixels, fStorage + offset, 256);
202                    offset += 256;
203                }
204                bitmapPixels += 256;
205            }
206        }
207        *table = *fBitmap;
208    }
209    return true;
210}
211
212///////////////////////////////////////////////////////////////////////////////
213
214#ifdef SK_CPU_BENDIAN
215#else
216    #define SK_A32_INDEX    (3 - (SK_A32_SHIFT >> 3))
217    #define SK_R32_INDEX    (3 - (SK_R32_SHIFT >> 3))
218    #define SK_G32_INDEX    (3 - (SK_G32_SHIFT >> 3))
219    #define SK_B32_INDEX    (3 - (SK_B32_SHIFT >> 3))
220#endif
221
222///////////////////////////////////////////////////////////////////////////////
223
224SkColorFilter* SkTableColorFilter::Create(const uint8_t table[256]) {
225    return SkNEW_ARGS(SkTable_ColorFilter, (table, table, table, table));
226}
227
228SkColorFilter* SkTableColorFilter::CreateARGB(const uint8_t tableA[256],
229                                              const uint8_t tableR[256],
230                                              const uint8_t tableG[256],
231                                              const uint8_t tableB[256]) {
232    return SkNEW_ARGS(SkTable_ColorFilter, (tableA, tableR, tableG, tableB));
233}
234
235SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkTableColorFilter)
236    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTable_ColorFilter)
237SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
238