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gfx/skia/trunk/src/images/SkImageDecoder_wbmp.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/images/SkImageDecoder_wbmp.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Sat, 03 Jan 2015 20:18:00 +0100
branch
TOR_BUG_3246
changeset 7
129ffea94266
permissions
-rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

michael@0 1
michael@0 2 /*
michael@0 3 * Copyright 2006 The Android Open Source Project
michael@0 4 *
michael@0 5 * Use of this source code is governed by a BSD-style license that can be
michael@0 6 * found in the LICENSE file.
michael@0 7 */
michael@0 8
michael@0 9
michael@0 10 #include "SkImageDecoder.h"
michael@0 11 #include "SkColor.h"
michael@0 12 #include "SkColorPriv.h"
michael@0 13 #include "SkMath.h"
michael@0 14 #include "SkStream.h"
michael@0 15 #include "SkTemplates.h"
michael@0 16 #include "SkUtils.h"
michael@0 17
michael@0 18 class SkWBMPImageDecoder : public SkImageDecoder {
michael@0 19 public:
michael@0 20 virtual Format getFormat() const SK_OVERRIDE {
michael@0 21 return kWBMP_Format;
michael@0 22 }
michael@0 23
michael@0 24 protected:
michael@0 25 virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
michael@0 26
michael@0 27 private:
michael@0 28 typedef SkImageDecoder INHERITED;
michael@0 29 };
michael@0 30
michael@0 31 static bool read_byte(SkStream* stream, uint8_t* data)
michael@0 32 {
michael@0 33 return stream->read(data, 1) == 1;
michael@0 34 }
michael@0 35
michael@0 36 static bool read_mbf(SkStream* stream, int* value)
michael@0 37 {
michael@0 38 int n = 0;
michael@0 39 uint8_t data;
michael@0 40 do {
michael@0 41 if (!read_byte(stream, &data)) {
michael@0 42 return false;
michael@0 43 }
michael@0 44 n = (n << 7) | (data & 0x7F);
michael@0 45 } while (data & 0x80);
michael@0 46
michael@0 47 *value = n;
michael@0 48 return true;
michael@0 49 }
michael@0 50
michael@0 51 struct wbmp_head {
michael@0 52 int fWidth;
michael@0 53 int fHeight;
michael@0 54
michael@0 55 bool init(SkStream* stream)
michael@0 56 {
michael@0 57 uint8_t data;
michael@0 58
michael@0 59 if (!read_byte(stream, &data) || data != 0) { // unknown type
michael@0 60 return false;
michael@0 61 }
michael@0 62 if (!read_byte(stream, &data) || (data & 0x9F)) { // skip fixed header
michael@0 63 return false;
michael@0 64 }
michael@0 65 if (!read_mbf(stream, &fWidth) || (unsigned)fWidth > 0xFFFF) {
michael@0 66 return false;
michael@0 67 }
michael@0 68 if (!read_mbf(stream, &fHeight) || (unsigned)fHeight > 0xFFFF) {
michael@0 69 return false;
michael@0 70 }
michael@0 71 return fWidth != 0 && fHeight != 0;
michael@0 72 }
michael@0 73 };
michael@0 74
michael@0 75 static void expand_bits_to_bytes(uint8_t dst[], const uint8_t src[], int bits)
michael@0 76 {
michael@0 77 int bytes = bits >> 3;
michael@0 78
michael@0 79 for (int i = 0; i < bytes; i++) {
michael@0 80 unsigned mask = *src++;
michael@0 81 dst[0] = (mask >> 7) & 1;
michael@0 82 dst[1] = (mask >> 6) & 1;
michael@0 83 dst[2] = (mask >> 5) & 1;
michael@0 84 dst[3] = (mask >> 4) & 1;
michael@0 85 dst[4] = (mask >> 3) & 1;
michael@0 86 dst[5] = (mask >> 2) & 1;
michael@0 87 dst[6] = (mask >> 1) & 1;
michael@0 88 dst[7] = (mask >> 0) & 1;
michael@0 89 dst += 8;
michael@0 90 }
michael@0 91
michael@0 92 bits &= 7;
michael@0 93 if (bits > 0) {
michael@0 94 unsigned mask = *src;
michael@0 95 do {
michael@0 96 *dst++ = (mask >> 7) & 1;;
michael@0 97 mask <<= 1;
michael@0 98 } while (--bits != 0);
michael@0 99 }
michael@0 100 }
michael@0 101
michael@0 102 bool SkWBMPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap,
michael@0 103 Mode mode)
michael@0 104 {
michael@0 105 wbmp_head head;
michael@0 106
michael@0 107 if (!head.init(stream)) {
michael@0 108 return false;
michael@0 109 }
michael@0 110
michael@0 111 int width = head.fWidth;
michael@0 112 int height = head.fHeight;
michael@0 113
michael@0 114 decodedBitmap->setConfig(SkBitmap::kIndex8_Config, width, height, 0,
michael@0 115 kOpaque_SkAlphaType);
michael@0 116
michael@0 117 if (SkImageDecoder::kDecodeBounds_Mode == mode) {
michael@0 118 return true;
michael@0 119 }
michael@0 120
michael@0 121 const SkPMColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
michael@0 122 SkColorTable* ct = SkNEW_ARGS(SkColorTable, (colors, 2));
michael@0 123 SkAutoUnref aur(ct);
michael@0 124
michael@0 125 if (!this->allocPixelRef(decodedBitmap, ct)) {
michael@0 126 return false;
michael@0 127 }
michael@0 128
michael@0 129 SkAutoLockPixels alp(*decodedBitmap);
michael@0 130
michael@0 131 uint8_t* dst = decodedBitmap->getAddr8(0, 0);
michael@0 132 // store the 1-bit valuess at the end of our pixels, so we won't stomp
michael@0 133 // on them before we're read them. Just trying to avoid a temp allocation
michael@0 134 size_t srcRB = SkAlign8(width) >> 3;
michael@0 135 size_t srcSize = height * srcRB;
michael@0 136 uint8_t* src = dst + decodedBitmap->getSize() - srcSize;
michael@0 137 if (stream->read(src, srcSize) != srcSize) {
michael@0 138 return false;
michael@0 139 }
michael@0 140
michael@0 141 for (int y = 0; y < height; y++)
michael@0 142 {
michael@0 143 expand_bits_to_bytes(dst, src, width);
michael@0 144 dst += decodedBitmap->rowBytes();
michael@0 145 src += srcRB;
michael@0 146 }
michael@0 147
michael@0 148 return true;
michael@0 149 }
michael@0 150
michael@0 151 ///////////////////////////////////////////////////////////////////////////////
michael@0 152 DEFINE_DECODER_CREATOR(WBMPImageDecoder);
michael@0 153 ///////////////////////////////////////////////////////////////////////////////
michael@0 154
michael@0 155 static SkImageDecoder* sk_wbmp_dfactory(SkStreamRewindable* stream) {
michael@0 156 wbmp_head head;
michael@0 157
michael@0 158 if (head.init(stream)) {
michael@0 159 return SkNEW(SkWBMPImageDecoder);
michael@0 160 }
michael@0 161 return NULL;
michael@0 162 }
michael@0 163
michael@0 164 static SkImageDecoder::Format get_format_wbmp(SkStreamRewindable* stream) {
michael@0 165 wbmp_head head;
michael@0 166 if (head.init(stream)) {
michael@0 167 return SkImageDecoder::kWBMP_Format;
michael@0 168 }
michael@0 169 return SkImageDecoder::kUnknown_Format;
michael@0 170 }
michael@0 171
michael@0 172 static SkImageDecoder_DecodeReg gDReg(sk_wbmp_dfactory);
michael@0 173 static SkImageDecoder_FormatReg gFormatReg(get_format_wbmp);

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