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DavidWyand-GG 2012-09-19 11:15:01 -04:00
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Engine/source/gfx/bitmap/loaders/bitmapGif.cpp Normal file
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//-----------------------------------------------------------------------------
// Copyright (c) 2012 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------
#include "platform/platform.h"
#include "core/stream/fileStream.h"
#include "core/util/path.h"
#include "gfx/bitmap/gBitmap.h"
// This must come after our headers due to a conflicting definition of VoidPtr
#include "lungif/gif_lib.h"
using namespace Torque;
static bool sReadGIF(Stream &stream, GBitmap *bitmap);
static bool sWriteGIF(GBitmap *bitmap, Stream &stream, U32 compressionLevel);
static struct _privateRegisterGIF
{
_privateRegisterGIF()
{
GBitmap::Registration reg;
reg.extensions.push_back( "gif" );
reg.readFunc = sReadGIF;
reg.writeFunc = sWriteGIF;
GBitmap::sRegisterFormat( reg );
}
} sStaticRegisterGIF;
//-------------------------------------- Replacement I/O for standard LIBjpeg
// functions. we don't wanna use
// FILE*'s...
static int gifReadDataFn(GifFileType *gifinfo, GifByteType *data, int length)
{
Stream *stream = (Stream*)gifinfo->UserData;
AssertFatal(stream != NULL, "gifReadDataFn::No stream.");
int pos = stream->getPosition();
if (stream->read(length, data))
return length;
if (stream->getStatus() == Stream::EOS)
return (stream->getPosition()-pos);
else
return 0;
}
//--------------------------------------
#if 0
// CodeReview - until we can write these, get rid of warning by disabling method.
static int gifWriteDataFn(GifFileType *gifinfo, GifByteType *data, int length)
{
Stream *stream = (Stream*)gifinfo->UserData;
AssertFatal(stream != NULL, "gifWriteDataFn::No stream.");
if (stream->write(length, data))
return length;
else
return 0;
}
#endif
//--------------------------------------
static bool sReadGIF( Stream &stream, GBitmap *bitmap )
{
GifFileType *gifinfo = DGifOpen( (void*)&stream, gifReadDataFn);
if (!gifinfo)
return false;
GifRecordType recordType;
do
{
if (DGifGetRecordType(gifinfo, &recordType) == GIF_ERROR)
break;
if (recordType == IMAGE_DESC_RECORD_TYPE)
{
if (DGifGetImageDesc(gifinfo) == GIF_ERROR)
break;
GFXFormat format = (gifinfo->SBackGroundColor == 0 ) ? GFXFormatR8G8B8 : GFXFormatR8G8B8A8;
bitmap->allocateBitmap(gifinfo->SWidth, gifinfo->SHeight, false, format);
// Assume no transparency until proven otherwise
bitmap->setHasTransparency(false);
U32 gwidth = gifinfo->Image.Width ? gifinfo->Image.Width : bitmap->getWidth();
U32 gheight= gifinfo->Image.Height ? gifinfo->Image.Height : bitmap->getHeight();
U32 gifSize = gwidth * gheight;
U8 *data = new U8[gifSize];
if (DGifGetLine(gifinfo, data, gifSize) != GIF_ERROR)
{
// use the global or local color table ?
GifColorType *color = NULL;
if (gifinfo->Image.ColorMap)
color = gifinfo->Image.ColorMap->Colors;
else if (gifinfo->SColorMap)
color = gifinfo->SColorMap->Colors;
if (color)
{
U8 *dst = bitmap->getAddress(gifinfo->Image.Left, gifinfo->Image.Top);
U8 *src = data;
U32 right = gifinfo->Image.Left + gwidth;
U32 bottom = gifinfo->Image.Top + gheight;
U32 next = (bitmap->getWidth() - gwidth) * bitmap->getBytesPerPixel();
if (format == GFXFormatR8G8B8A8)
{
for (U32 y=gifinfo->Image.Top; y<bottom; y++)
{
for (U32 x=gifinfo->Image.Left; x<right; x++, src++)
{
if (*src == gifinfo->SBackGroundColor)
{
// this is a transparent pixel
dst[0] = 0; // red
dst[1] = 0; // green
dst[2] = 0; // blue
dst[3] = 0; // alpha
bitmap->setHasTransparency(true);
}
else
{
dst[0] = color[*src].Red;
dst[1] = color[*src].Green;
dst[2] = color[*src].Blue;
dst[3] = 0; // alpha
}
dst += bitmap->getBytesPerPixel();
}
dst += next;
}
}
else
{
for (U32 y=gifinfo->Image.Top; y<bottom; y++)
{
for (U32 x=gifinfo->Image.Left; x<right; x++, src++)
{
dst[0] = color[*src].Red;
dst[1] = color[*src].Green;
dst[2] = color[*src].Blue;
dst += bitmap->getBytesPerPixel();
}
dst += next;
}
}
delete [] data;
DGifCloseFile(gifinfo);
return true;
}
}
// failure
delete [] data;
break;
}
else if (recordType == EXTENSION_RECORD_TYPE)
{
GifByteType *extension;
S32 extCode;
// Skip any extension blocks in file
if (DGifGetExtension(gifinfo, &extCode, &extension) != GIF_ERROR)
{
while (extension != NULL)
{
if (DGifGetExtensionNext(gifinfo, &extension) == GIF_ERROR)
{
return false;
}
}
}
else
{
return false;
}
}
// There used to be a break right here. This caused the while condition to
// never get processed, and so it never looped through all the records in
// the GIF. I took a quick peek back at TGB and TGE histories and I am not
// sure where this change got made, but I can't figure out why the loading
// worked at all, ever, with that break in there. The only case I can think
// of is if the first record in the GIF was the bitmap data.
// [6/6/2007 Pat]
}while (recordType != TERMINATE_RECORD_TYPE);
DGifCloseFile(gifinfo);
return true;
}
//--------------------------------------------------------------------------
static bool sWriteGIF(GBitmap *bitmap, Stream &stream, U32 compressionLevel)
{
TORQUE_UNUSED( bitmap );
TORQUE_UNUSED( stream );
TORQUE_UNUSED( compressionLevel );
return false;
}