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// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "stdmisc.h"
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#include "nel/misc/bitmap.h"
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#ifdef USE_GIF
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#include <gif_lib.h>
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#endif
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using namespace std;
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namespace NLMISC
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{
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#ifdef USE_GIF
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// GIFLIB_MAJOR is defined from version 5
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#ifndef GIFLIB_MAJOR
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#define GIFLIB_MAJOR 4
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#endif
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static uint8 GIF_TRANSPARENT_MASK = 0x01;
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static uint8 GIF_DISPOSE_MASK = 0x07;
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static sint8 GIF_NOT_TRANSPARENT = -1;
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static uint8 GIF_DISPOSE_NONE = 0;
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static uint8 GIF_DISPOSE_LEAVE = 1;
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static uint8 GIF_DISPOSE_BACKGROUND = 2;
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static uint8 GIF_DISPOSE_RESTORE = 3;
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static NLMISC::IStream *GIFStream = NULL;
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#if GIFLIB_MAJOR < 5
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static uint8 INTERLACED_OFFSET[] = { 0, 4, 2, 1 };
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static uint8 INTERLACED_JUMP[] = { 8, 8, 4, 2 };
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#endif
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static int readGIFData(GifFileType *gif, GifByteType *data, int length){
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NLMISC::IStream *f = static_cast<NLMISC::IStream *>(gif->UserData);
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if(!f->isReading()) return 0;
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try
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{
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f->serialBuffer((uint8*) data, length);
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}
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catch(...)
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{
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nlwarning("error while reading JPEG image");
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return 0;
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}
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return length;
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}
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/*-------------------------------------------------------------------*\
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readGIF
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\*-------------------------------------------------------------------*/
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uint8 CBitmap::readGIF( NLMISC::IStream &f )
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{
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if(!f.isReading()) return false;
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{
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// check gif canvas dimension
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uint16 ver;
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uint16 width;
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uint16 height;
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f.serial(ver);
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f.serial(width);
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f.serial(height);
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// limit image size as we are using 32bit pixels
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// 4000x4000x4 ~ 61MiB
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if (width*height > 4000*4000)
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{
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nlwarning("GIF image size is too big (width=%d, height=%d)", width, height);
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return 0;
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}
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// rewind for gif decoder
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f.seek(-10, IStream::current);
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}
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#if GIFLIB_MAJOR >= 5
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sint32 errorCode;
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GifFileType *gif = DGifOpen(&f, readGIFData, &errorCode);
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if (gif == NULL)
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{
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nlwarning("failed to open gif, error=%d", errorCode);
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return 0;
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}
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#else
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GifFileType *gif = DGifOpen(&f, readGIFData);
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if (gif == NULL)
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{
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nlwarning("failed to open gif, error=%d", GifLastError());
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return 0;
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}
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#endif
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// this will read and decode all frames
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sint32 ret = DGifSlurp(gif);
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if (ret != GIF_OK)
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{
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nlwarning("failed to read gif, error=%d", ret);
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#if GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
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DGifCloseFile(gif, &errorCode);
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#else
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DGifCloseFile(gif);
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#endif
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return 0;
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}
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// resize target buffer
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uint32 dstChannels = 4; // RGBA
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resize (gif->SWidth, gif->SHeight, RGBA);
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// make transparent
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_Data[0].fill(0);
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// make sure background color index exists in global colormap
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if (gif->SColorMap && gif->SColorMap->ColorCount < gif->SBackGroundColor)
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{
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gif->SBackGroundColor = 0;
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}
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// merge all frames one by one into single target
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ColorMapObject *ColorMap;
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sint32 transparency = GIF_NOT_TRANSPARENT;
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uint8 r, g, b, a;
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uint32 offset_x, offset_y, width, height;
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// disable loop as we only interested in first frame
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// for (uint32 frame = 0; frame < gif->ImageCount; frame++)
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{
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uint32 frame = 0;
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SavedImage *curFrame = &gif->SavedImages[frame];
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if (curFrame->ExtensionBlockCount > 0)
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{
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for(uint e=0; e<curFrame->ExtensionBlockCount; e++){
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ExtensionBlock *ext = &curFrame->ExtensionBlocks[e];
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if (ext->Function == GRAPHICS_EXT_FUNC_CODE) {
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uint8 flag = ext->Bytes[0];
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//delay = (ext.Bytes[1] << 8) | ext.Bytes[2];
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transparency = (flag & GIF_TRANSPARENT_MASK) ? ext->Bytes[3] : GIF_NOT_TRANSPARENT;
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//dispose = ((flag >> 2) & GIF_DISPOSE_MASK);
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}
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}
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}
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// select color map for frame
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if (curFrame->ImageDesc.ColorMap)
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{
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ColorMap = curFrame->ImageDesc.ColorMap;
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}
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else
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if (gif->SColorMap)
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{
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ColorMap = gif->SColorMap;
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}
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else
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{
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nlwarning("GIF has no global or local color map");
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ColorMap = NULL;
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}
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// copy frame to canvas
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offset_x = curFrame->ImageDesc.Left;
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offset_y = curFrame->ImageDesc.Top;
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width = curFrame->ImageDesc.Width;
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height = curFrame->ImageDesc.Height;
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#if GIFLIB_MAJOR < 5
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// giflib 4 does not handle interlaced images, so we must do it
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if (curFrame->ImageDesc.Interlace)
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{
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uint32 srcOffset = 0;
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for (uint8 pass = 0; pass < 4; pass++)
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{
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uint32 nextLine = INTERLACED_OFFSET[pass];
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// y is destination row
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for (uint32 y = 0; y < height; y++)
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{
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if (y != nextLine)
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continue;
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uint32 dstOffset = (y + offset_y)*gif->SWidth*dstChannels + offset_x*dstChannels;
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nextLine += INTERLACED_JUMP[pass];
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for (uint32 x = 0; x < width; x++)
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{
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srcOffset++;
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dstOffset+= dstChannels;
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uint32 index = curFrame->RasterBits[srcOffset];
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if (index != transparency)
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{
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// make sure color index is not outside colormap
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if (ColorMap)
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{
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if (index > ColorMap->ColorCount)
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{
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index = 0;
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}
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r = ColorMap->Colors[index].Red;
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g = ColorMap->Colors[index].Green;
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b = ColorMap->Colors[index].Blue;
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}
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else
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{
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// broken gif, no colormap
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r = g = b = 0;
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}
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a = 255;
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}
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else
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{
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// transparent
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r = g = b = a = 0;
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}
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_Data[0][dstOffset] = r;
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_Data[0][dstOffset+1] = g;
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_Data[0][dstOffset+2] = b;
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_Data[0][dstOffset+3] = a;
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} // x loop
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} // y loop
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} // pass loop
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}
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else
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#endif
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for (uint32 y = 0; y < height; y++)
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{
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uint32 srcOffset = y*width;
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uint32 dstOffset = (y + offset_y)*gif->SWidth*dstChannels + offset_x*dstChannels;
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for (uint32 x = 0; x < width; x++)
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{
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srcOffset++;
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dstOffset+= dstChannels;
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uint32 index = curFrame->RasterBits[srcOffset];
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if (index != transparency)
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{
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// make sure color index is not outside colormap
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if (ColorMap)
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{
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if (index > ColorMap->ColorCount)
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{
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index = 0;
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}
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r = ColorMap->Colors[index].Red;
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g = ColorMap->Colors[index].Green;
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b = ColorMap->Colors[index].Blue;
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}
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else
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{
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// broken gif, no colormap
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r = g = b = 0;
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}
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a = 255;
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}
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else
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{
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// transparent
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r = g = b = a = 0;
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}
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_Data[0][dstOffset] = r;
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_Data[0][dstOffset+1] = g;
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_Data[0][dstOffset+2] = b;
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_Data[0][dstOffset+3] = a;
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} // x loop
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} // y loop
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}
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// clean up after the read, and free any memory allocated
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#if GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
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DGifCloseFile(gif, &errorCode);
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#else
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DGifCloseFile(gif);
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#endif
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//return the size of a pixel as 32bits
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return 32;
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}
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#else
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uint8 CBitmap::readGIF( NLMISC::IStream &/* f */)
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{
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nlwarning ("You must compile NLMISC with USE_GIF if you want gif support");
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return 0;
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}
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#endif
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}//namespace
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