The Tor Browser: gfx/skia/trunk/src/images/SkImageDecoder

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

gfx/skia/trunk/src/images/SkImageDecoder_libwebp.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.

 /*
  * Copyright 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkColorPriv.h"
 #include "SkScaledBitmapSampler.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
 #include "SkUtils.h"
 // A WebP decoder only, on top of (subset of) libwebp
 // For more information on WebP image format, and libwebp library, see:
 //   http://code.google.com/speed/webp/
 //   http://www.webmproject.org/code/#libwebp_webp_image_decoder_library
 //   http://review.webmproject.org/gitweb?p=libwebp.git
 #include <stdio.h>
 extern "C" {
 // If moving libwebp out of skia source tree, path for webp headers must be
 // updated accordingly. Here, we enforce using local copy in webp sub-directory.
 #include "webp/decode.h"
 #include "webp/encode.h"
 }
 // this enables timing code to report milliseconds for a decode
 //#define TIME_DECODE
 //////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////
 // Define VP8 I/O on top of Skia stream
 //////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////
 static const size_t WEBP_VP8_HEADER_SIZE = 64;
 static const size_t WEBP_IDECODE_BUFFER_SZ = (1 << 16);
 // Parse headers of RIFF container, and check for valid Webp (VP8) content.
 static bool webp_parse_header(SkStream* stream, int* width, int* height, int* alpha) {
     unsigned char buffer[WEBP_VP8_HEADER_SIZE];
     size_t bytesToRead = WEBP_VP8_HEADER_SIZE;
     size_t totalBytesRead = 0;
     do {
         unsigned char* dst = buffer + totalBytesRead;
         const size_t bytesRead = stream->read(dst, bytesToRead);
         if (0 == bytesRead) {
             // Could not read any bytes. Check to see if we are at the end (exit
             // condition), and continue reading if not. Important for streams
             // that do not have all the data ready.
             continue;
         }
         bytesToRead -= bytesRead;
         totalBytesRead += bytesRead;
         SkASSERT(bytesToRead + totalBytesRead == WEBP_VP8_HEADER_SIZE);
     } while (!stream->isAtEnd() && bytesToRead > 0);
     WebPBitstreamFeatures features;
     VP8StatusCode status = WebPGetFeatures(buffer, totalBytesRead, &features);
     if (VP8_STATUS_OK != status) {
         return false; // Invalid WebP file.
     }
     *width = features.width;
     *height = features.height;
     *alpha = features.has_alpha;
     // sanity check for image size that's about to be decoded.
     {
         int64_t size = sk_64_mul(*width, *height);
         if (!sk_64_isS32(size)) {
             return false;
         }
         // now check that if we are 4-bytes per pixel, we also don't overflow
         if (sk_64_asS32(size) > (0x7FFFFFFF >> 2)) {
             return false;
         }
     }
     return true;
 }
 class SkWEBPImageDecoder: public SkImageDecoder {
 public:
     SkWEBPImageDecoder() {
         fInputStream = NULL;
         fOrigWidth = 0;
         fOrigHeight = 0;
         fHasAlpha = 0;
     }
     virtual ~SkWEBPImageDecoder() {
         SkSafeUnref(fInputStream);
     }
     virtual Format getFormat() const SK_OVERRIDE {
         return kWEBP_Format;
     }
 protected:
     virtual bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) SK_OVERRIDE;
     virtual bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) SK_OVERRIDE;
     virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
 private:
     /**
      *  Called when determining the output config to request to webp.
      *  If the image does not have alpha, there is no need to premultiply.
      *  If the caller wants unpremultiplied colors, that is respected.
      */
     bool shouldPremultiply() const {
         return SkToBool(fHasAlpha) && !this->getRequireUnpremultipliedColors();
     }
     bool setDecodeConfig(SkBitmap* decodedBitmap, int width, int height);
     SkStream* fInputStream;
     int fOrigWidth;
     int fOrigHeight;
     int fHasAlpha;
     typedef SkImageDecoder INHERITED;
 };
 //////////////////////////////////////////////////////////////////////////
 #ifdef TIME_DECODE
 #include "SkTime.h"
 class AutoTimeMillis {
 public:
     AutoTimeMillis(const char label[]) :
         fLabel(label) {
         if (NULL == fLabel) {
             fLabel = "";
         }
         fNow = SkTime::GetMSecs();
     }
     ~AutoTimeMillis() {
         SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow);
     }
 private:
     const char* fLabel;
     SkMSec fNow;
 };
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 // This guy exists just to aid in debugging, as it allows debuggers to just
 // set a break-point in one place to see all error exists.
 static bool return_false(const SkBitmap& bm, const char msg[]) {
     SkDEBUGF(("libwebp error %s [%d %d]", msg, bm.width(), bm.height()));
     return false; // must always return false
 }
 static WEBP_CSP_MODE webp_decode_mode(const SkBitmap* decodedBitmap, bool premultiply) {
     WEBP_CSP_MODE mode = MODE_LAST;
     SkBitmap::Config config = decodedBitmap->config();
     if (config == SkBitmap::kARGB_8888_Config) {
         #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
             mode = premultiply ? MODE_bgrA : MODE_BGRA;
         #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
             mode = premultiply ? MODE_rgbA : MODE_RGBA;
         #else
             #error "Skia uses BGRA or RGBA byte order"
         #endif
     } else if (config == SkBitmap::kARGB_4444_Config) {
         mode = premultiply ? MODE_rgbA_4444 : MODE_RGBA_4444;
     } else if (config == SkBitmap::kRGB_565_Config) {
         mode = MODE_RGB_565;
     }
     SkASSERT(MODE_LAST != mode);
     return mode;
 }
 // Incremental WebP image decoding. Reads input buffer of 64K size iteratively
 // and decodes this block to appropriate color-space as per config object.
 static bool webp_idecode(SkStream* stream, WebPDecoderConfig* config) {
     WebPIDecoder* idec = WebPIDecode(NULL, 0, config);
     if (NULL == idec) {
         WebPFreeDecBuffer(&config->output);
         return false;
     }
     if (!stream->rewind()) {
         SkDebugf("Failed to rewind webp stream!");
         return false;
     }
     const size_t readBufferSize = stream->hasLength() ?
             SkTMin(stream->getLength(), WEBP_IDECODE_BUFFER_SZ) : WEBP_IDECODE_BUFFER_SZ;
     SkAutoMalloc srcStorage(readBufferSize);
     unsigned char* input = (uint8_t*)srcStorage.get();
     if (NULL == input) {
         WebPIDelete(idec);
         WebPFreeDecBuffer(&config->output);
         return false;
     }
     bool success = true;
     VP8StatusCode status = VP8_STATUS_SUSPENDED;
     do {
         const size_t bytesRead = stream->read(input, readBufferSize);
         if (0 == bytesRead) {
             success = false;
             break;
         }
         status = WebPIAppend(idec, input, bytesRead);
         if (VP8_STATUS_OK != status && VP8_STATUS_SUSPENDED != status) {
             success = false;
             break;
         }
     } while (VP8_STATUS_OK != status);
     srcStorage.free();
     WebPIDelete(idec);
     WebPFreeDecBuffer(&config->output);
     return success;
 }
 static bool webp_get_config_resize(WebPDecoderConfig* config,
                                    SkBitmap* decodedBitmap,
                                    int width, int height, bool premultiply) {
     WEBP_CSP_MODE mode = webp_decode_mode(decodedBitmap, premultiply);
     if (MODE_LAST == mode) {
         return false;
     }
     if (0 == WebPInitDecoderConfig(config)) {
         return false;
     }
     config->output.colorspace = mode;
     config->output.u.RGBA.rgba = (uint8_t*)decodedBitmap->getPixels();
     config->output.u.RGBA.stride = (int) decodedBitmap->rowBytes();
     config->output.u.RGBA.size = decodedBitmap->getSize();
     config->output.is_external_memory = 1;
     if (width != decodedBitmap->width() || height != decodedBitmap->height()) {
         config->options.use_scaling = 1;
         config->options.scaled_width = decodedBitmap->width();
         config->options.scaled_height = decodedBitmap->height();
     }
     return true;
 }
 static bool webp_get_config_resize_crop(WebPDecoderConfig* config,
                                         SkBitmap* decodedBitmap,
                                         const SkIRect& region, bool premultiply) {
     if (!webp_get_config_resize(config, decodedBitmap, region.width(),
                                 region.height(), premultiply)) {
       return false;
     }
     config->options.use_cropping = 1;
     config->options.crop_left = region.fLeft;
     config->options.crop_top = region.fTop;
     config->options.crop_width = region.width();
     config->options.crop_height = region.height();
     return true;
 }
 bool SkWEBPImageDecoder::setDecodeConfig(SkBitmap* decodedBitmap,
                                          int width, int height) {
     SkBitmap::Config config = this->getPrefConfig(k32Bit_SrcDepth, SkToBool(fHasAlpha));
     // YUV converter supports output in RGB565, RGBA4444 and RGBA8888 formats.
     if (fHasAlpha) {
         if (config != SkBitmap::kARGB_4444_Config) {
             config = SkBitmap::kARGB_8888_Config;
         }
     } else {
         if (config != SkBitmap::kRGB_565_Config &&
             config != SkBitmap::kARGB_4444_Config) {
             config = SkBitmap::kARGB_8888_Config;
         }
     }
     if (!this->chooseFromOneChoice(config, width, height)) {
         return false;
     }
     return decodedBitmap->setConfig(config, width, height, 0,
                                     fHasAlpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType);
 }
 bool SkWEBPImageDecoder::onBuildTileIndex(SkStreamRewindable* stream,
                                           int *width, int *height) {
     int origWidth, origHeight, hasAlpha;
     if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) {
         return false;
     }
     if (!stream->rewind()) {
         SkDebugf("Failed to rewind webp stream!");
         return false;
     }
     *width = origWidth;
     *height = origHeight;
     SkRefCnt_SafeAssign(this->fInputStream, stream);
     this->fOrigWidth = origWidth;
     this->fOrigHeight = origHeight;
     this->fHasAlpha = hasAlpha;
     return true;
 }
 static bool is_config_compatible(const SkBitmap& bitmap) {
     SkBitmap::Config config = bitmap.config();
     return config == SkBitmap::kARGB_4444_Config ||
            config == SkBitmap::kRGB_565_Config ||
            config == SkBitmap::kARGB_8888_Config;
 }
 bool SkWEBPImageDecoder::onDecodeSubset(SkBitmap* decodedBitmap,
                                         const SkIRect& region) {
     SkIRect rect = SkIRect::MakeWH(fOrigWidth, fOrigHeight);
     if (!rect.intersect(region)) {
         // If the requested region is entirely outsides the image, return false
         return false;
     }
     const int sampleSize = this->getSampleSize();
     SkScaledBitmapSampler sampler(rect.width(), rect.height(), sampleSize);
     const int width = sampler.scaledWidth();
     const int height = sampler.scaledHeight();
     // The image can be decoded directly to decodedBitmap if
     //   1. the region is within the image range
     //   2. bitmap's config is compatible
     //   3. bitmap's size is same as the required region (after sampled)
     bool directDecode = (rect == region) &&
                         (decodedBitmap->isNull() ||
                          (is_config_compatible(*decodedBitmap) &&
                          (decodedBitmap->width() == width) &&
                          (decodedBitmap->height() == height)));
     SkBitmap tmpBitmap;
     SkBitmap *bitmap = decodedBitmap;
     if (!directDecode) {
         bitmap = &tmpBitmap;
     }
     if (bitmap->isNull()) {
         if (!setDecodeConfig(bitmap, width, height)) {
             return false;
         }
         // alloc from native heap if it is a temp bitmap. (prevent GC)
         bool allocResult = (bitmap == decodedBitmap)
                                ? allocPixelRef(bitmap, NULL)
                                : bitmap->allocPixels();
         if (!allocResult) {
             return return_false(*decodedBitmap, "allocPixelRef");
         }
     } else {
         // This is also called in setDecodeConfig in above block.
         // i.e., when bitmap->isNull() is true.
         if (!chooseFromOneChoice(bitmap->config(), width, height)) {
             return false;
         }
     }
     SkAutoLockPixels alp(*bitmap);
     WebPDecoderConfig config;
     if (!webp_get_config_resize_crop(&config, bitmap, rect,
                                      this->shouldPremultiply())) {
         return false;
     }
     // Decode the WebP image data stream using WebP incremental decoding for
     // the specified cropped image-region.
     if (!webp_idecode(this->fInputStream, &config)) {
         return false;
     }
     if (!directDecode) {
         cropBitmap(decodedBitmap, bitmap, sampleSize, region.x(), region.y(),
                    region.width(), region.height(), rect.x(), rect.y());
     }
     return true;
 }
 bool SkWEBPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap,
                                   Mode mode) {
 #ifdef TIME_DECODE
     AutoTimeMillis atm("WEBP Decode");
 #endif
     int origWidth, origHeight, hasAlpha;
     if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) {
         return false;
     }
     this->fHasAlpha = hasAlpha;
     const int sampleSize = this->getSampleSize();
     SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize);
     if (!setDecodeConfig(decodedBitmap, sampler.scaledWidth(),
                          sampler.scaledHeight())) {
         return false;
     }
     // If only bounds are requested, done
     if (SkImageDecoder::kDecodeBounds_Mode == mode) {
         return true;
     }
     if (!this->allocPixelRef(decodedBitmap, NULL)) {
         return return_false(*decodedBitmap, "allocPixelRef");
     }
     SkAutoLockPixels alp(*decodedBitmap);
     WebPDecoderConfig config;
     if (!webp_get_config_resize(&config, decodedBitmap, origWidth, origHeight,
                                 this->shouldPremultiply())) {
         return false;
     }
     // Decode the WebP image data stream using WebP incremental decoding.
     return webp_idecode(stream, &config);
 }
 ///////////////////////////////////////////////////////////////////////////////
 #include "SkUnPreMultiply.h"
 typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* out, int width,
                                  const SkPMColor* SK_RESTRICT ctable);
 static void ARGB_8888_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
                              const SkPMColor*) {
   const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
   for (int i = 0; i < width; ++i) {
       const uint32_t c = *src++;
       rgb[0] = SkGetPackedR32(c);
       rgb[1] = SkGetPackedG32(c);
       rgb[2] = SkGetPackedB32(c);
       rgb += 3;
   }
 }
 static void ARGB_8888_To_RGBA(const uint8_t* in, uint8_t* rgb, int width,
                               const SkPMColor*) {
   const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
   const SkUnPreMultiply::Scale* SK_RESTRICT table =
       SkUnPreMultiply::GetScaleTable();
   for (int i = 0; i < width; ++i) {
       const uint32_t c = *src++;
       uint8_t a = SkGetPackedA32(c);
       uint8_t r = SkGetPackedR32(c);
       uint8_t g = SkGetPackedG32(c);
       uint8_t b = SkGetPackedB32(c);
       if (0 != a && 255 != a) {
         SkUnPreMultiply::Scale scale = table[a];
         r = SkUnPreMultiply::ApplyScale(scale, r);
         g = SkUnPreMultiply::ApplyScale(scale, g);
         b = SkUnPreMultiply::ApplyScale(scale, b);
       }
       rgb[0] = r;
       rgb[1] = g;
       rgb[2] = b;
       rgb[3] = a;
       rgb += 4;
   }
 }
 static void RGB_565_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
                            const SkPMColor*) {
   const uint16_t* SK_RESTRICT src = (const uint16_t*)in;
   for (int i = 0; i < width; ++i) {
       const uint16_t c = *src++;
       rgb[0] = SkPacked16ToR32(c);
       rgb[1] = SkPacked16ToG32(c);
       rgb[2] = SkPacked16ToB32(c);
       rgb += 3;
   }
 }
 static void ARGB_4444_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
                              const SkPMColor*) {
   const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
   for (int i = 0; i < width; ++i) {
       const SkPMColor16 c = *src++;
       rgb[0] = SkPacked4444ToR32(c);
       rgb[1] = SkPacked4444ToG32(c);
       rgb[2] = SkPacked4444ToB32(c);
       rgb += 3;
   }
 }
 static void ARGB_4444_To_RGBA(const uint8_t* in, uint8_t* rgb, int width,
                               const SkPMColor*) {
   const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
   const SkUnPreMultiply::Scale* SK_RESTRICT table =
       SkUnPreMultiply::GetScaleTable();
   for (int i = 0; i < width; ++i) {
       const SkPMColor16 c = *src++;
       uint8_t a = SkPacked4444ToA32(c);
       uint8_t r = SkPacked4444ToR32(c);
       uint8_t g = SkPacked4444ToG32(c);
       uint8_t b = SkPacked4444ToB32(c);
       if (0 != a && 255 != a) {
         SkUnPreMultiply::Scale scale = table[a];
         r = SkUnPreMultiply::ApplyScale(scale, r);
         g = SkUnPreMultiply::ApplyScale(scale, g);
         b = SkUnPreMultiply::ApplyScale(scale, b);
       }
       rgb[0] = r;
       rgb[1] = g;
       rgb[2] = b;
       rgb[3] = a;
       rgb += 4;
   }
 }
 static void Index8_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
                           const SkPMColor* SK_RESTRICT ctable) {
   const uint8_t* SK_RESTRICT src = (const uint8_t*)in;
   for (int i = 0; i < width; ++i) {
       const uint32_t c = ctable[*src++];
       rgb[0] = SkGetPackedR32(c);
       rgb[1] = SkGetPackedG32(c);
       rgb[2] = SkGetPackedB32(c);
       rgb += 3;
   }
 }
 static ScanlineImporter ChooseImporter(const SkBitmap::Config& config,
                                        bool  hasAlpha,
                                        int*  bpp) {
     switch (config) {
         case SkBitmap::kARGB_8888_Config:
             if (hasAlpha) {
                 *bpp = 4;
                 return ARGB_8888_To_RGBA;
             } else {
                 *bpp = 3;
                 return ARGB_8888_To_RGB;
             }
         case SkBitmap::kARGB_4444_Config:
             if (hasAlpha) {
                 *bpp = 4;
                 return ARGB_4444_To_RGBA;
             } else {
                 *bpp = 3;
                 return ARGB_4444_To_RGB;
             }
         case SkBitmap::kRGB_565_Config:
             *bpp = 3;
             return RGB_565_To_RGB;
         case SkBitmap::kIndex8_Config:
             *bpp = 3;
             return Index8_To_RGB;
         default:
             return NULL;
     }
 }
 static int stream_writer(const uint8_t* data, size_t data_size,
                          const WebPPicture* const picture) {
   SkWStream* const stream = (SkWStream*)picture->custom_ptr;
   return stream->write(data, data_size) ? 1 : 0;
 }
 class SkWEBPImageEncoder : public SkImageEncoder {
 protected:
     virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) SK_OVERRIDE;
 private:
     typedef SkImageEncoder INHERITED;
 };
 bool SkWEBPImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bm,
                                   int quality) {
     const SkBitmap::Config config = bm.config();
     const bool hasAlpha = !bm.isOpaque();
     int bpp = -1;
     const ScanlineImporter scanline_import = ChooseImporter(config, hasAlpha,
                                                             &bpp);
     if (NULL == scanline_import) {
         return false;
     }
     if (-1 == bpp) {
         return false;
     }
     SkAutoLockPixels alp(bm);
     SkAutoLockColors ctLocker;
     if (NULL == bm.getPixels()) {
         return false;
     }
     WebPConfig webp_config;
     if (!WebPConfigPreset(&webp_config, WEBP_PRESET_DEFAULT, (float) quality)) {
         return false;
     }
     WebPPicture pic;
     WebPPictureInit(&pic);
     pic.width = bm.width();
     pic.height = bm.height();
     pic.writer = stream_writer;
     pic.custom_ptr = (void*)stream;
     const SkPMColor* colors = ctLocker.lockColors(bm);
     const uint8_t* src = (uint8_t*)bm.getPixels();
     const int rgbStride = pic.width * bpp;
     // Import (for each scanline) the bit-map image (in appropriate color-space)
     // to RGB color space.
     uint8_t* rgb = new uint8_t[rgbStride * pic.height];
     for (int y = 0; y < pic.height; ++y) {
         scanline_import(src + y * bm.rowBytes(), rgb + y * rgbStride,
                         pic.width, colors);
     }
     bool ok;
     if (bpp == 3) {
         ok = SkToBool(WebPPictureImportRGB(&pic, rgb, rgbStride));
     } else {
         ok = SkToBool(WebPPictureImportRGBA(&pic, rgb, rgbStride));
     }
     delete[] rgb;
     ok = ok && WebPEncode(&webp_config, &pic);
     WebPPictureFree(&pic);
     return ok;
 }
 ///////////////////////////////////////////////////////////////////////////////
 DEFINE_DECODER_CREATOR(WEBPImageDecoder);
 DEFINE_ENCODER_CREATOR(WEBPImageEncoder);
 ///////////////////////////////////////////////////////////////////////////////
 static SkImageDecoder* sk_libwebp_dfactory(SkStreamRewindable* stream) {
     int width, height, hasAlpha;
     if (!webp_parse_header(stream, &width, &height, &hasAlpha)) {
         return NULL;
     }
     // Magic matches, call decoder
     return SkNEW(SkWEBPImageDecoder);
 }
 static SkImageDecoder::Format get_format_webp(SkStreamRewindable* stream) {
     int width, height, hasAlpha;
     if (webp_parse_header(stream, &width, &height, &hasAlpha)) {
         return SkImageDecoder::kWEBP_Format;
     }
     return SkImageDecoder::kUnknown_Format;
 }
 static SkImageEncoder* sk_libwebp_efactory(SkImageEncoder::Type t) {
       return (SkImageEncoder::kWEBP_Type == t) ? SkNEW(SkWEBPImageEncoder) : NULL;
 }
 static SkImageDecoder_DecodeReg gDReg(sk_libwebp_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_webp);
 static SkImageEncoder_EncodeReg gEReg(sk_libwebp_efactory);

The Tor Browser / annotate

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

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