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| 1 /** | |
| 2 ** Copyright 2006, 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 "SkImageDecoder.h" | |
| 18 #include "SkColor.h" | |
| 19 #include "SkColorPriv.h" | |
| 20 #include "SkMath.h" | |
| 21 #include "SkStream.h" | |
| 22 #include "SkTemplates.h" | |
| 23 #include "SkUtils.h" | |
| 24 | |
| 25 class SkWBMPImageDecoder : public SkImageDecoder { | |
| 26 public: | |
| 27 virtual Format getFormat() const { | |
| 28 return kWBMP_Format; | |
| 29 } | |
| 30 | |
| 31 protected: | |
| 32 virtual bool onDecode(SkStream* stream, SkBitmap* bm, | |
| 33 SkBitmap::Config pref, Mode); | |
| 34 }; | |
| 35 | |
| 36 static bool read_byte(SkStream* stream, uint8_t* data) | |
| 37 { | |
| 38 return stream->read(data, 1) == 1; | |
| 39 } | |
| 40 | |
| 41 static bool read_mbf(SkStream* stream, int* value) | |
| 42 { | |
| 43 int n = 0; | |
| 44 uint8_t data; | |
| 45 do { | |
| 46 if (!read_byte(stream, &data)) { | |
| 47 return false; | |
| 48 } | |
| 49 n = (n << 7) | (data & 0x7F); | |
| 50 } while (data & 0x80); | |
| 51 | |
| 52 *value = n; | |
| 53 return true; | |
| 54 } | |
| 55 | |
| 56 struct wbmp_head { | |
| 57 int fWidth; | |
| 58 int fHeight; | |
| 59 | |
| 60 bool init(SkStream* stream) | |
| 61 { | |
| 62 uint8_t data; | |
| 63 | |
| 64 if (!read_byte(stream, &data) || data != 0) { // unknown type | |
| 65 return false; | |
| 66 } | |
| 67 if (!read_byte(stream, &data) || (data & 0x9F)) { // skip fixed header | |
| 68 return false; | |
| 69 } | |
| 70 if (!read_mbf(stream, &fWidth) || (unsigned)fWidth > 0xFFFF) { | |
| 71 return false; | |
| 72 } | |
| 73 if (!read_mbf(stream, &fHeight) || (unsigned)fHeight > 0xFFFF) { | |
| 74 return false; | |
| 75 } | |
| 76 return fWidth != 0 && fHeight != 0; | |
| 77 } | |
| 78 }; | |
| 79 | |
| 80 SkImageDecoder* SkImageDecoder_WBMP_Factory(SkStream* stream) | |
| 81 { | |
| 82 wbmp_head head; | |
| 83 | |
| 84 if (head.init(stream)) { | |
| 85 return SkNEW(SkWBMPImageDecoder); | |
| 86 } | |
| 87 return NULL; | |
| 88 } | |
| 89 | |
| 90 static void expand_bits_to_bytes(uint8_t dst[], const uint8_t src[], int bits) | |
| 91 { | |
| 92 int bytes = bits >> 3; | |
| 93 | |
| 94 for (int i = 0; i < bytes; i++) { | |
| 95 unsigned mask = *src++; | |
| 96 dst[0] = (mask >> 7) & 1; | |
| 97 dst[1] = (mask >> 6) & 1; | |
| 98 dst[2] = (mask >> 5) & 1; | |
| 99 dst[3] = (mask >> 4) & 1; | |
| 100 dst[4] = (mask >> 3) & 1; | |
| 101 dst[5] = (mask >> 2) & 1; | |
| 102 dst[6] = (mask >> 1) & 1; | |
| 103 dst[7] = (mask >> 0) & 1; | |
| 104 dst += 8; | |
| 105 } | |
| 106 | |
| 107 bits &= 7; | |
| 108 if (bits > 0) { | |
| 109 unsigned mask = *src; | |
| 110 do { | |
| 111 *dst++ = (mask >> 7) & 1;; | |
| 112 mask <<= 1; | |
| 113 } while (--bits != 0); | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 #define SkAlign8(x) (((x) + 7) & ~7) | |
| 118 | |
| 119 bool SkWBMPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap, | |
| 120 SkBitmap::Config prefConfig, Mode mode) | |
| 121 { | |
| 122 wbmp_head head; | |
| 123 | |
| 124 if (!head.init(stream)) { | |
| 125 return false; | |
| 126 } | |
| 127 | |
| 128 int width = head.fWidth; | |
| 129 int height = head.fHeight; | |
| 130 | |
| 131 // assign these directly, in case we return kDimensions_Result | |
| 132 decodedBitmap->setConfig(SkBitmap::kIndex8_Config, width, height); | |
| 133 decodedBitmap->setIsOpaque(true); | |
| 134 | |
| 135 if (SkImageDecoder::kDecodeBounds_Mode == mode) | |
| 136 return true; | |
| 137 | |
| 138 const SkPMColor colors[] = { SK_ColorBLACK, SK_ColorWHITE }; | |
| 139 SkColorTable* ct = SkNEW_ARGS(SkColorTable, (colors, 2)); | |
| 140 SkAutoUnref aur(ct); | |
| 141 | |
| 142 if (!this->allocPixelRef(decodedBitmap, ct)) { | |
| 143 return false; | |
| 144 } | |
| 145 | |
| 146 SkAutoLockPixels alp(*decodedBitmap); | |
| 147 | |
| 148 uint8_t* dst = decodedBitmap->getAddr8(0, 0); | |
| 149 // store the 1-bit valuess at the end of our pixels, so we won't stomp | |
| 150 // on them before we're read them. Just trying to avoid a temp allocation | |
| 151 size_t srcRB = SkAlign8(width) >> 3; | |
| 152 size_t srcSize = height * srcRB; | |
| 153 uint8_t* src = dst + decodedBitmap->getSize() - srcSize; | |
| 154 if (stream->read(src, srcSize) != srcSize) { | |
| 155 return false; | |
| 156 } | |
| 157 | |
| 158 for (int y = 0; y < height; y++) | |
| 159 { | |
| 160 expand_bits_to_bytes(dst, src, width); | |
| 161 dst += decodedBitmap->rowBytes(); | |
| 162 src += srcRB; | |
| 163 } | |
| 164 | |
| 165 return true; | |
| 166 } | |
| 167 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/