Remove the remainder of the skia source code from the Chromium repo....

skia/images/SkMovie_gif.cpp

-/* libs/graphics/images/SkImageDecoder_libgif.cpp
-**
-** Copyright 2006, 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 "SkMovie.h"
-#include "SkColor.h"
-#include "SkColorPriv.h"
-#include "SkStream.h"
-#include "SkTemplates.h"
-
-#include "gif_lib.h"
-
-class SkGIFMovie : public SkMovie {
-public:
-    // we do NOT hold onto the stream, so it is OK if it is on the
-    // stack of the caller
-    SkGIFMovie(SkStream* stream);
-    virtual ~SkGIFMovie();
-
-protected:
-    virtual bool onGetInfo(Info*);
-    virtual bool onSetTime(SkMSec);
-    virtual bool onGetBitmap(SkBitmap*);
-    
-private:
-    GifFileType* fGIF;
-    SavedImage* fCurrSavedImage;
-};
-
-SkMovie* SkMovie_GIF_StreamFactory(SkStream* stream) {
-    char buf[GIF_STAMP_LEN];
-    if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) {
-        if (memcmp(GIF_STAMP,   buf, GIF_STAMP_LEN) == 0 ||
-                memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 ||
-                memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) {
-            stream->rewind();
-            return SkNEW_ARGS(SkGIFMovie, (stream));
-        }
-    }
-    return NULL;
-}
-
-SkMovie* SkMovie_GIF_MemoryFactory(const void* data, size_t length) {
-    if (length > GIF_STAMP_LEN && !memcmp(GIF_STAMP, data, GIF_STAMP_LEN)) {
-        SkMemoryStream  stream(data, length);
-        return SkNEW_ARGS(SkGIFMovie, (&stream));
-    }
-    return NULL;
-}
-
-static int Decode(GifFileType* fileType, GifByteType* out, int size) {
-    SkStream* stream = (SkStream*) fileType->UserData;
-    return (int) stream->read(out, size);
-}
-
-SkGIFMovie::SkGIFMovie(SkStream* stream)
-{
-    fGIF = DGifOpen( stream, Decode );
-    if (NULL == fGIF)
-        return;
-
-    if (DGifSlurp(fGIF) != GIF_OK)
-    {
-        DGifCloseFile(fGIF);
-        fGIF = NULL;
-    }
-    fCurrSavedImage = NULL;
-}
-
-SkGIFMovie::~SkGIFMovie()
-{
-    if (fGIF)
-        DGifCloseFile(fGIF);
-}
-
-static SkMSec savedimage_duration(const SavedImage* image)
-{
-    for (int j = 0; j < image->ExtensionBlockCount; j++)
-    {
-        if (image->ExtensionBlocks[j].Function == GRAPHICS_EXT_FUNC_CODE)
-        {
-            int size = image->ExtensionBlocks[j].ByteCount;
-            SkASSERT(size >= 4);
-            const uint8_t* b = (const uint8_t*)image->ExtensionBlocks[j].Bytes;
-            return ((b[2] << 8) | b[1]) * 10;
-        }
-    }
-    return 0;
-}
-
-bool SkGIFMovie::onGetInfo(Info* info)
-{
-    if (NULL == fGIF)
-        return false;
-
-    SkMSec dur = 0;
-    for (int i = 0; i < fGIF->ImageCount; i++)
-        dur += savedimage_duration(&fGIF->SavedImages[i]);
-
-    info->fDuration = dur;
-    info->fWidth = fGIF->SWidth;
-    info->fHeight = fGIF->SHeight;
-    info->fIsOpaque = false;    // how to compute?
-    return true;
-}
-
-bool SkGIFMovie::onSetTime(SkMSec time)
-{
-    if (NULL == fGIF)
-        return false;
-
-    SkMSec dur = 0;
-    for (int i = 0; i < fGIF->ImageCount; i++)
-    {
-        dur += savedimage_duration(&fGIF->SavedImages[i]);
-        if (dur >= time)
-        {
-            SavedImage* prev = fCurrSavedImage;
-            fCurrSavedImage = &fGIF->SavedImages[i];
-            return prev != fCurrSavedImage;
-        }
-    }
-    fCurrSavedImage = &fGIF->SavedImages[fGIF->ImageCount - 1];
-    return true;
-}
-
-bool SkGIFMovie::onGetBitmap(SkBitmap* bm)
-{
-    GifFileType* gif = fGIF;
-    if (NULL == gif)
-        return false;
-
-    // should we check for the Image cmap or the global (SColorMap) first? 
-    ColorMapObject* cmap = gif->SColorMap;
-    if (cmap == NULL)
-        cmap = gif->Image.ColorMap;
-
-    if (cmap == NULL || gif->ImageCount < 1 || cmap->ColorCount != (1 << cmap->BitsPerPixel))
-    {
-        SkASSERT(!"bad colortable setup");
-        return false;
-    }
-
-    const int width = gif->SWidth;
-    const int height = gif->SHeight;
-    if (width <= 0 || height <= 0) {
-        return false;
-    }
-
-    SavedImage*      gif_image = fCurrSavedImage;
-    SkBitmap::Config config = SkBitmap::kIndex8_Config;
-
-    SkColorTable* colorTable = SkNEW_ARGS(SkColorTable, (cmap->ColorCount));
-    SkAutoUnref aur(colorTable);
-
-    bm->setConfig(config, width, height, 0);
-    if (!bm->allocPixels(colorTable)) {
-        return false;
-    }
-
-    int transparent = -1;
-    for (int i = 0; i < gif_image->ExtensionBlockCount; ++i) {
-      ExtensionBlock* eb = gif_image->ExtensionBlocks + i;
-      if (eb->Function == 0xF9 && 
-          eb->ByteCount == 4) {
-        bool has_transparency = ((eb->Bytes[0] & 1) == 1);
-        if (has_transparency) {
-          transparent = (unsigned char)eb->Bytes[3];
-        }
-      }
-    }
-
-    SkPMColor* colorPtr = colorTable->lockColors();
-
-    if (transparent >= 0)
-        memset(colorPtr, 0, cmap->ColorCount * 4);
-    else
-        colorTable->setFlags(colorTable->getFlags() | SkColorTable::kColorsAreOpaque_Flag);
-
-    for (int index = 0; index < cmap->ColorCount; index++)
-    {
-        if (transparent != index)
-            colorPtr[index] = SkPackARGB32(0xFF, cmap->Colors[index].Red, 
-                cmap->Colors[index].Green, cmap->Colors[index].Blue);
-    }
-    colorTable->unlockColors(true);
-
-    unsigned char* in = (unsigned char*)gif_image->RasterBits;
-    unsigned char* out = bm->getAddr8(0, 0);
-    if (gif->Image.Interlace) {
-
-      // deinterlace
-        int row;
-      // group 1 - every 8th row, starting with row 0
-      for (row = 0; row < height; row += 8) {
-        memcpy(out + width * row, in, width);
-        in += width;
-      }
-
-      // group 2 - every 8th row, starting with row 4
-      for (row = 4; row < height; row += 8) {
-        memcpy(out + width * row, in, width);
-        in += width;
-      }
-
-      // group 3 - every 4th row, starting with row 2
-      for (row = 2; row < height; row += 4) {
-        memcpy(out + width * row, in, width);
-        in += width;
-      }
-
-      for (row = 1; row < height; row += 2) {
-        memcpy(out + width * row, in, width);
-        in += width;
-      }
-
-    } else {
-      memcpy(out, in, width * height);
-    }
-    return true;
-}