Alien-FreeImage
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src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
// ==========================================================
// GIF Loader and Writer
//
// Design and implementation by
// - Ryan Rubley <ryan@lostreality.org>
// - Raphaël Gaquer <raphael.gaquer@alcer.com>
// - Aaron Shumate <aaron@shumate.us>
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================
#ifdef _MSC_VER
#pragma warning (disable : 4786) // identifier was truncated to 'number' characters
#endif
#include "FreeImage.h"
#include "Utilities.h"
#include "../Metadata/FreeImageTag.h"
// ==========================================================
// Metadata declarations
// ==========================================================
#define GIF_DISPOSAL_UNSPECIFIED 0
#define GIF_DISPOSAL_LEAVE 1
#define GIF_DISPOSAL_BACKGROUND 2
#define GIF_DISPOSAL_PREVIOUS 3
// ==========================================================
// Constant/Typedef declarations
// ==========================================================
struct GIFinfo {
BOOL read;
//only really used when reading
size_t global_color_table_offset;
int global_color_table_size;
BYTE background_color;
std::vector<size_t> application_extension_offsets;
std::vector<size_t> comment_extension_offsets;
std::vector<size_t> graphic_control_extension_offsets;
std::vector<size_t> image_descriptor_offsets;
GIFinfo() : read(0), global_color_table_offset(0), global_color_table_size(0), background_color(0)
{
}
};
struct PageInfo {
PageInfo(int d, int l, int t, int w, int h) {
disposal_method = d; left = (WORD)l; top = (WORD)t; width = (WORD)w; height = (WORD)h;
}
int disposal_method;
WORD left, top, width, height;
};
//GIF defines a max of 12 bits per code
#define MAX_LZW_CODE 4096
class StringTable
{
public:
StringTable();
~StringTable();
void Initialize(int minCodeSize);
BYTE *FillInputBuffer(int len);
void CompressStart(int bpp, int width);
int CompressEnd(BYTE *buf); //0-4 bytes
bool Compress(BYTE *buf, int *len);
bool Decompress(BYTE *buf, int *len);
void Done(void);
protected:
bool m_done;
int m_minCodeSize, m_clearCode, m_endCode, m_nextCode;
int m_bpp, m_slack; //Compressor information
int m_prefix; //Compressor state variable
int m_codeSize, m_codeMask; //Compressor/Decompressor state variables
int m_oldCode; //Decompressor state variable
int m_partial, m_partialSize; //Compressor/Decompressor bit buffer
int firstPixelPassed; // A specific flag that indicates if the first pixel
// of the whole image had already been read
std::string m_strings[MAX_LZW_CODE]; //This is what is really the "string table" data for the Decompressor
int* m_strmap;
//input buffer
BYTE *m_buffer;
int m_bufferSize, m_bufferRealSize, m_bufferPos, m_bufferShift;
void ClearCompressorTable(void);
void ClearDecompressorTable(void);
};
#define GIF_PACKED_LSD_HAVEGCT 0x80
#define GIF_PACKED_LSD_COLORRES 0x70
#define GIF_PACKED_LSD_GCTSORTED 0x08
#define GIF_PACKED_LSD_GCTSIZE 0x07
#define GIF_PACKED_ID_HAVELCT 0x80
#define GIF_PACKED_ID_INTERLACED 0x40
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
BOOL bResult = FALSE;
if( !strncmp(buf, "GIF", 3) ) {
if( buf[3] >= '0' && buf[3] <= '9' && buf[4] >= '0' && buf[4] <= '9' && buf[5] >= 'a' && buf[5] <= 'z' ) {
bResult = TRUE;
}
}
io->seek_proc(handle, -6, SEEK_CUR);
return bResult;
}
static BOOL DLL_CALLCONV
SupportsExportDepth(int depth) {
return (depth == 1) ||
(depth == 4) ||
(depth == 8);
}
static BOOL DLL_CALLCONV
SupportsExportType(FREE_IMAGE_TYPE type) {
return (type == FIT_BITMAP) ? TRUE : FALSE;
}
// ----------------------------------------------------------
static void *DLL_CALLCONV
Open(FreeImageIO *io, fi_handle handle, BOOL read) {
GIFinfo *info = new(std::nothrow) GIFinfo;
if( info == NULL ) {
return NULL;
}
// 25/02/2008 MDA: Not safe to memset GIFinfo structure with VS 2008 (safe iterators),
// perform initialization in constructor instead.
// memset(info, 0, sizeof(GIFinfo));
info->read = read;
if( read ) {
try {
//Header
if( !Validate(io, handle) ) {
throw FI_MSG_ERROR_MAGIC_NUMBER;
}
io->seek_proc(handle, 6, SEEK_CUR);
//Logical Screen Descriptor
io->seek_proc(handle, 4, SEEK_CUR);
BYTE packed;
if( io->read_proc(&packed, 1, 1, handle) < 1 ) {
throw "EOF reading Logical Screen Descriptor";
}
if( io->read_proc(&info->background_color, 1, 1, handle) < 1 ) {
throw "EOF reading Logical Screen Descriptor";
}
io->seek_proc(handle, 1, SEEK_CUR);
//Global Color Table
if( packed & GIF_PACKED_LSD_HAVEGCT ) {
info->global_color_table_offset = io->tell_proc(handle);
info->global_color_table_size = 2 << (packed & GIF_PACKED_LSD_GCTSIZE);
io->seek_proc(handle, 3 * info->global_color_table_size, SEEK_CUR);
}
//Scan through all the rest of the blocks, saving offsets
size_t gce_offset = 0;
BYTE block = 0;
while( block != GIF_BLOCK_TRAILER ) {
if( io->read_proc(&block, 1, 1, handle) < 1 ) {
throw "EOF reading blocks";
}
if( block == GIF_BLOCK_IMAGE_DESCRIPTOR ) {
info->image_descriptor_offsets.push_back(io->tell_proc(handle));
//GCE may be 0, meaning no GCE preceded this ID
info->graphic_control_extension_offsets.push_back(gce_offset);
gce_offset = 0;
io->seek_proc(handle, 8, SEEK_CUR);
if( io->read_proc(&packed, 1, 1, handle) < 1 ) {
throw "EOF reading Image Descriptor";
}
//Local Color Table
if( packed & GIF_PACKED_ID_HAVELCT ) {
io->seek_proc(handle, 3 * (2 << (packed & GIF_PACKED_ID_LCTSIZE)), SEEK_CUR);
}
//LZW Minimum Code Size
io->seek_proc(handle, 1, SEEK_CUR);
} else if( block == GIF_BLOCK_EXTENSION ) {
BYTE ext;
if( io->read_proc(&ext, 1, 1, handle) < 1 ) {
throw "EOF reading extension";
}
if( ext == GIF_EXT_GRAPHIC_CONTROL ) {
//overwrite previous offset if more than one GCE found before an ID
gce_offset = io->tell_proc(handle);
} else if( ext == GIF_EXT_COMMENT ) {
info->comment_extension_offsets.push_back(io->tell_proc(handle));
} else if( ext == GIF_EXT_APPLICATION ) {
info->application_extension_offsets.push_back(io->tell_proc(handle));
}
} else if( block == GIF_BLOCK_TRAILER ) {
continue;
} else {
throw "Invalid GIF block found";
}
//Data Sub-blocks
BYTE len;
if( io->read_proc(&len, 1, 1, handle) < 1 ) {
throw "EOF reading sub-block";
}
while( len != 0 ) {
io->seek_proc(handle, len, SEEK_CUR);
if( io->read_proc(&len, 1, 1, handle) < 1 ) {
throw "EOF reading sub-block";
}
}
}
} catch (const char *msg) {
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
Close(FreeImageIO *io, fi_handle handle, void *data) {
if( data == NULL ) {
return;
}
GIFinfo *info = (GIFinfo *)data;
if( !info->read ) {
//Trailer
BYTE b = GIF_BLOCK_TRAILER;
io->write_proc(&b, 1, 1, handle);
}
delete info;
}
static int DLL_CALLCONV
PageCount(FreeImageIO *io, fi_handle handle, void *data) {
if( data == NULL ) {
return 0;
}
GIFinfo *info = (GIFinfo *)data;
return (int) info->image_descriptor_offsets.size();
}
static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
if( data == NULL ) {
return NULL;
}
GIFinfo *info = (GIFinfo *)data;
if( page == -1 ) {
page = 0;
}
if( page < 0 || page >= (int)info->image_descriptor_offsets.size() ) {
return NULL;
}
FIBITMAP *dib = NULL;
try {
bool have_transparent = false, no_local_palette = false, interlaced = false;
int disposal_method = GIF_DISPOSAL_LEAVE, delay_time = 0, transparent_color = 0;
WORD left, top, width, height;
BYTE packed, b;
WORD w;
//playback pages to generate what the user would see for this frame
if( (flags & GIF_PLAYBACK) == GIF_PLAYBACK ) {
//Logical Screen Descriptor
io->seek_proc(handle, 6, SEEK_SET);
WORD logicalwidth, logicalheight;
io->read_proc(&logicalwidth, 2, 1, handle);
io->read_proc(&logicalheight, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&logicalwidth);
SwapShort(&logicalheight);
#endif
//set the background color with 0 alpha
RGBQUAD background;
if( info->global_color_table_offset != 0 && info->background_color < info->global_color_table_size ) {
io->seek_proc(handle, (long)(info->global_color_table_offset + (info->background_color * 3)), SEEK_SET);
io->read_proc(&background.rgbRed, 1, 1, handle);
io->read_proc(&background.rgbGreen, 1, 1, handle);
io->read_proc(&background.rgbBlue, 1, 1, handle);
} else {
background.rgbRed = 0;
background.rgbGreen = 0;
background.rgbBlue = 0;
}
background.rgbReserved = 0;
//allocate entire logical area
dib = FreeImage_Allocate(logicalwidth, logicalheight, 32);
if( dib == NULL ) {
throw FI_MSG_ERROR_DIB_MEMORY;
}
//fill with background color to start
int x, y;
RGBQUAD *scanline;
for( y = 0; y < logicalheight; y++ ) {
scanline = (RGBQUAD *)FreeImage_GetScanLine(dib, y);
for( x = 0; x < logicalwidth; x++ ) {
*scanline++ = background;
}
}
//cache some info about each of the pages so we can avoid decoding as many of them as possible
std::vector<PageInfo> pageinfo;
int start = page, end = page;
while( start >= 0 ) {
//Graphic Control Extension
io->seek_proc(handle, (long)(info->graphic_control_extension_offsets[start] + 1), SEEK_SET);
io->read_proc(&packed, 1, 1, handle);
have_transparent = (packed & GIF_PACKED_GCE_HAVETRANS) ? true : false;
disposal_method = (packed & GIF_PACKED_GCE_DISPOSAL) >> 2;
//Image Descriptor
io->seek_proc(handle, (long)(info->image_descriptor_offsets[start]), SEEK_SET);
io->read_proc(&left, 2, 1, handle);
io->read_proc(&top, 2, 1, handle);
io->read_proc(&width, 2, 1, handle);
io->read_proc(&height, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&left);
SwapShort(&top);
SwapShort(&width);
SwapShort(&height);
#endif
pageinfo.push_back(PageInfo(disposal_method, left, top, width, height));
if( start != end ) {
if( left == 0 && top == 0 && width == logicalwidth && height == logicalheight ) {
if( disposal_method == GIF_DISPOSAL_BACKGROUND ) {
pageinfo.pop_back();
start++;
break;
} else if( disposal_method != GIF_DISPOSAL_PREVIOUS ) {
if( !have_transparent ) {
break;
}
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
}
}
}
//copy page data into logical buffer, with full alpha opaqueness
for( y = 0; y < info.height; y++ ) {
const int scanidx = logicalheight - (y + info.top) - 1;
if ( scanidx < 0 ) {
break; // If data is corrupt, don't calculate in invalid scanline
}
scanline = (RGBQUAD *)FreeImage_GetScanLine(dib, scanidx) + info.left;
BYTE *pageline = FreeImage_GetScanLine(pagedib, info.height - y - 1);
for( x = 0; x < info.width; x++ ) {
if( !have_transparent || *pageline != transparent_color ) {
*scanline = pal[*pageline];
scanline->rgbReserved = 255;
}
scanline++;
pageline++;
}
}
//copy frame time
if( page == end ) {
FITAG *tag;
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, pagedib, "FrameTime", FIDT_LONG, &tag) ) {
delay_time = *(LONG *)FreeImage_GetTagValue(tag);
}
}
FreeImage_Unload(pagedib);
}
}
//setup frame time
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "FrameTime", ANIMTAG_FRAMETIME, FIDT_LONG, 1, 4, &delay_time);
return dib;
}
//get the actual frame image data for a single frame
//Image Descriptor
io->seek_proc(handle, (long)info->image_descriptor_offsets[page], SEEK_SET);
io->read_proc(&left, 2, 1, handle);
io->read_proc(&top, 2, 1, handle);
io->read_proc(&width, 2, 1, handle);
io->read_proc(&height, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&left);
SwapShort(&top);
SwapShort(&width);
SwapShort(&height);
#endif
io->read_proc(&packed, 1, 1, handle);
interlaced = (packed & GIF_PACKED_ID_INTERLACED) ? true : false;
no_local_palette = (packed & GIF_PACKED_ID_HAVELCT) ? false : true;
int bpp = 8;
if( (flags & GIF_LOAD256) == 0 ) {
if( !no_local_palette ) {
int size = 2 << (packed & GIF_PACKED_ID_LCTSIZE);
if( size <= 2 ) bpp = 1;
else if( size <= 16 ) bpp = 4;
} else if( info->global_color_table_offset != 0 ) {
if( info->global_color_table_size <= 2 ) bpp = 1;
else if( info->global_color_table_size <= 16 ) bpp = 4;
}
}
dib = FreeImage_Allocate(width, height, bpp);
if( dib == NULL ) {
throw FI_MSG_ERROR_DIB_MEMORY;
}
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "FrameLeft", ANIMTAG_FRAMELEFT, FIDT_SHORT, 1, 2, &left);
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "FrameTop", ANIMTAG_FRAMETOP, FIDT_SHORT, 1, 2, &top);
b = no_local_palette ? 1 : 0;
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "NoLocalPalette", ANIMTAG_NOLOCALPALETTE, FIDT_BYTE, 1, 1, &b);
b = interlaced ? 1 : 0;
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "Interlaced", ANIMTAG_INTERLACED, FIDT_BYTE, 1, 1, &b);
//Palette
RGBQUAD *pal = FreeImage_GetPalette(dib);
if( !no_local_palette ) {
int size = 2 << (packed & GIF_PACKED_ID_LCTSIZE);
int i = 0;
while( i < size ) {
io->read_proc(&pal[i].rgbRed, 1, 1, handle);
io->read_proc(&pal[i].rgbGreen, 1, 1, handle);
io->read_proc(&pal[i].rgbBlue, 1, 1, handle);
i++;
}
} else if( info->global_color_table_offset != 0 ) {
long pos = io->tell_proc(handle);
io->seek_proc(handle, (long)info->global_color_table_offset, SEEK_SET);
int i = 0;
while( i < info->global_color_table_size ) {
io->read_proc(&pal[i].rgbRed, 1, 1, handle);
io->read_proc(&pal[i].rgbGreen, 1, 1, handle);
io->read_proc(&pal[i].rgbBlue, 1, 1, handle);
i++;
}
io->seek_proc(handle, pos, SEEK_SET);
} else {
//its legal to have no palette, but we're going to generate *something*
for( int i = 0; i < 256; i++ ) {
pal[i].rgbRed = (BYTE)i;
pal[i].rgbGreen = (BYTE)i;
pal[i].rgbBlue = (BYTE)i;
}
}
//LZW Minimum Code Size
io->read_proc(&b, 1, 1, handle);
StringTable *stringtable = new(std::nothrow) StringTable;
stringtable->Initialize(b);
//Image Data Sub-blocks
int x = 0, xpos = 0, y = 0, shift = 8 - bpp, mask = (1 << bpp) - 1, interlacepass = 0;
BYTE *scanline = FreeImage_GetScanLine(dib, height - 1);
BYTE buf[4096];
io->read_proc(&b, 1, 1, handle);
while( b ) {
io->read_proc(stringtable->FillInputBuffer(b), b, 1, handle);
int size = sizeof(buf);
while( stringtable->Decompress(buf, &size) ) {
for( int i = 0; i < size; i++ ) {
scanline[xpos] |= (buf[i] & mask) << shift;
if( shift > 0 ) {
shift -= bpp;
} else {
xpos++;
shift = 8 - bpp;
}
if( ++x >= width ) {
if( interlaced ) {
y += g_GifInterlaceIncrement[interlacepass];
if( y >= height && ++interlacepass < GIF_INTERLACE_PASSES ) {
y = g_GifInterlaceOffset[interlacepass];
}
} else {
y++;
}
if( y >= height ) {
stringtable->Done();
break;
}
x = xpos = 0;
shift = 8 - bpp;
scanline = FreeImage_GetScanLine(dib, height - y - 1);
}
}
size = sizeof(buf);
}
io->read_proc(&b, 1, 1, handle);
}
if( page == 0 ) {
size_t idx;
//Logical Screen Descriptor
io->seek_proc(handle, 6, SEEK_SET);
WORD logicalwidth, logicalheight;
io->read_proc(&logicalwidth, 2, 1, handle);
io->read_proc(&logicalheight, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&logicalwidth);
SwapShort(&logicalheight);
#endif
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "LogicalWidth", ANIMTAG_LOGICALWIDTH, FIDT_SHORT, 1, 2, &logicalwidth);
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "LogicalHeight", ANIMTAG_LOGICALHEIGHT, FIDT_SHORT, 1, 2, &logicalheight);
//Global Color Table
if( info->global_color_table_offset != 0 ) {
RGBQUAD globalpalette[256];
io->seek_proc(handle, (long)info->global_color_table_offset, SEEK_SET);
int i = 0;
while( i < info->global_color_table_size ) {
io->read_proc(&globalpalette[i].rgbRed, 1, 1, handle);
io->read_proc(&globalpalette[i].rgbGreen, 1, 1, handle);
io->read_proc(&globalpalette[i].rgbBlue, 1, 1, handle);
globalpalette[i].rgbReserved = 0;
i++;
}
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "GlobalPalette", ANIMTAG_GLOBALPALETTE, FIDT_PALETTE, info->global_color_table_size, info->global_color_table_size * 4, globalpalette);
//background color
if( info->background_color < info->global_color_table_size ) {
FreeImage_SetBackgroundColor(dib, &globalpalette[info->background_color]);
}
}
//Application Extension
LONG loop = 1; //If no AE with a loop count is found, the default must be 1
for( idx = 0; idx < info->application_extension_offsets.size(); idx++ ) {
io->seek_proc(handle, (long)info->application_extension_offsets[idx], SEEK_SET);
io->read_proc(&b, 1, 1, handle);
if( b == 11 ) { //All AEs start with an 11 byte sub-block to determine what type of AE it is
char buf[11];
io->read_proc(buf, 11, 1, handle);
if( !memcmp(buf, "NETSCAPE2.0", 11) || !memcmp(buf, "ANIMEXTS1.0", 11) ) { //Not everybody recognizes ANIMEXTS1.0 but it is valid
io->read_proc(&b, 1, 1, handle);
if( b == 3 ) { //we're supposed to have a 3 byte sub-block now
io->read_proc(&b, 1, 1, handle); //this should be 0x01 but isn't really important
io->read_proc(&w, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&w);
#endif
loop = w;
if( loop > 0 ) loop++;
break;
}
}
}
}
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "Loop", ANIMTAG_LOOP, FIDT_LONG, 1, 4, &loop);
//Comment Extension
for( idx = 0; idx < info->comment_extension_offsets.size(); idx++ ) {
io->seek_proc(handle, (long)info->comment_extension_offsets[idx], SEEK_SET);
std::string comment;
char buf[255];
io->read_proc(&b, 1, 1, handle);
while( b ) {
io->read_proc(buf, b, 1, handle);
comment.append(buf, b);
io->read_proc(&b, 1, 1, handle);
}
comment.append(1, '\0');
sprintf(buf, "Comment%d", idx);
DWORD comment_size = (DWORD)comment.size();
FreeImage_SetMetadataEx(FIMD_COMMENTS, dib, buf, 1, FIDT_ASCII, comment_size, comment_size, comment.c_str());
}
}
//Graphic Control Extension
if( info->graphic_control_extension_offsets[page] != 0 ) {
io->seek_proc(handle, (long)(info->graphic_control_extension_offsets[page] + 1), SEEK_SET);
io->read_proc(&packed, 1, 1, handle);
io->read_proc(&w, 2, 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&w);
#endif
io->read_proc(&b, 1, 1, handle);
have_transparent = (packed & GIF_PACKED_GCE_HAVETRANS) ? true : false;
disposal_method = (packed & GIF_PACKED_GCE_DISPOSAL) >> 2;
delay_time = w * 10; //convert cs to ms
transparent_color = b;
if( have_transparent ) {
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
page = 0;
}
try {
BYTE packed, b;
WORD w;
FITAG *tag;
int bpp = FreeImage_GetBPP(dib);
if( bpp != 1 && bpp != 4 && bpp != 8 ) {
throw "Only 1, 4, or 8 bpp images supported";
}
bool have_transparent = false, no_local_palette = false, interlaced = false;
int disposal_method = GIF_DISPOSAL_BACKGROUND, delay_time = 100, transparent_color = 0;
WORD left = 0, top = 0, width = (WORD)FreeImage_GetWidth(dib), height = (WORD)FreeImage_GetHeight(dib);
WORD output_height = height;
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "FrameLeft", FIDT_SHORT, &tag) ) {
left = *(WORD *)FreeImage_GetTagValue(tag);
}
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "FrameTop", FIDT_SHORT, &tag) ) {
top = *(WORD *)FreeImage_GetTagValue(tag);
}
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "NoLocalPalette", FIDT_BYTE, &tag) ) {
no_local_palette = *(BYTE *)FreeImage_GetTagValue(tag) ? true : false;
}
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "Interlaced", FIDT_BYTE, &tag) ) {
interlaced = *(BYTE *)FreeImage_GetTagValue(tag) ? true : false;
}
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "FrameTime", FIDT_LONG, &tag) ) {
delay_time = *(LONG *)FreeImage_GetTagValue(tag);
}
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "DisposalMethod", FIDT_BYTE, &tag) ) {
disposal_method = *(BYTE *)FreeImage_GetTagValue(tag);
}
RGBQUAD *pal = FreeImage_GetPalette(dib);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&left);
SwapShort(&top);
SwapShort(&width);
SwapShort(&height);
#endif
if( page == 0 ) {
//gather some info
WORD logicalwidth = width; // width has already been swapped...
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "LogicalWidth", FIDT_SHORT, &tag) ) {
logicalwidth = *(WORD *)FreeImage_GetTagValue(tag);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&logicalwidth);
#endif
}
WORD logicalheight = height; // height has already been swapped...
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "LogicalHeight", FIDT_SHORT, &tag) ) {
logicalheight = *(WORD *)FreeImage_GetTagValue(tag);
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&logicalheight);
#endif
}
RGBQUAD *globalpalette = NULL;
int globalpalette_size = 0;
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "GlobalPalette", FIDT_PALETTE, &tag) ) {
globalpalette_size = FreeImage_GetTagCount(tag);
if( globalpalette_size >= 2 ) {
globalpalette = (RGBQUAD *)FreeImage_GetTagValue(tag);
}
}
//Logical Screen Descriptor
io->write_proc(&logicalwidth, 2, 1, handle);
io->write_proc(&logicalheight, 2, 1, handle);
packed = GIF_PACKED_LSD_COLORRES;
b = 0;
RGBQUAD background_color;
if( globalpalette != NULL ) {
packed |= GIF_PACKED_LSD_HAVEGCT;
if( globalpalette_size < 4 ) {
globalpalette_size = 2;
packed |= 0 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 8 ) {
globalpalette_size = 4;
packed |= 1 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 16 ) {
globalpalette_size = 8;
packed |= 2 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 32 ) {
globalpalette_size = 16;
packed |= 3 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 64 ) {
globalpalette_size = 32;
packed |= 4 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 128 ) {
globalpalette_size = 64;
packed |= 5 & GIF_PACKED_LSD_GCTSIZE;
} else if( globalpalette_size < 256 ) {
globalpalette_size = 128;
packed |= 6 & GIF_PACKED_LSD_GCTSIZE;
} else {
globalpalette_size = 256;
packed |= 7 & GIF_PACKED_LSD_GCTSIZE;
}
if( FreeImage_GetBackgroundColor(dib, &background_color) ) {
for( int i = 0; i < globalpalette_size; i++ ) {
if( background_color.rgbRed == globalpalette[i].rgbRed &&
background_color.rgbGreen == globalpalette[i].rgbGreen &&
background_color.rgbBlue == globalpalette[i].rgbBlue ) {
b = (BYTE)i;
break;
}
}
}
} else {
packed |= (bpp - 1) & GIF_PACKED_LSD_GCTSIZE;
}
io->write_proc(&packed, 1, 1, handle);
io->write_proc(&b, 1, 1, handle);
b = 0;
io->write_proc(&b, 1, 1, handle);
//Global Color Table
if( globalpalette != NULL ) {
int i = 0;
while( i < globalpalette_size ) {
io->write_proc(&globalpalette[i].rgbRed, 1, 1, handle);
io->write_proc(&globalpalette[i].rgbGreen, 1, 1, handle);
io->write_proc(&globalpalette[i].rgbBlue, 1, 1, handle);
i++;
}
}
//Application Extension
LONG loop = 0;
if( FreeImage_GetMetadataEx(FIMD_ANIMATION, dib, "Loop", FIDT_LONG, &tag) ) {
loop = *(LONG *)FreeImage_GetTagValue(tag);
}
if( loop != 1 ) {
//the Netscape extension is really "repeats" not "loops"
if( loop > 1 ) loop--;
if( loop > 0xFFFF ) loop = 0xFFFF;
w = (WORD)loop;
#ifdef FREEIMAGE_BIGENDIAN
SwapShort(&w);
#endif
io->write_proc((void *)"\x21\xFF\x0BNETSCAPE2.0\x03\x01", 16, 1, handle);
io->write_proc(&w, 2, 1, handle);
b = 0;
io->write_proc(&b, 1, 1, handle);
}
//Comment Extension
FIMETADATA *mdhandle = NULL;
FITAG *tag = NULL;
mdhandle = FreeImage_FindFirstMetadata(FIMD_COMMENTS, dib, &tag);
if( mdhandle ) {
do {
if( FreeImage_GetTagType(tag) == FIDT_ASCII ) {
int length = FreeImage_GetTagLength(tag) - 1;
char *value = (char *)FreeImage_GetTagValue(tag);
io->write_proc((void *)"\x21\xFE", 2, 1, handle);
while( length > 0 ) {
b = (BYTE)(length >= 255 ? 255 : length);
io->write_proc(&b, 1, 1, handle);
io->write_proc(value, b, 1, handle);
value += b;
length -= b;
}
b = 0;
io->write_proc(&b, 1, 1, handle);
}
} while(FreeImage_FindNextMetadata(mdhandle, &tag));
FreeImage_FindCloseMetadata(mdhandle);
}
}
//Graphic Control Extension
if( FreeImage_IsTransparent(dib) ) {
int count = FreeImage_GetTransparencyCount(dib);
BYTE *table = FreeImage_GetTransparencyTable(dib);
for( int i = 0; i < count; i++ ) {
if( table[i] == 0 ) {
have_transparent = true;
transparent_color = i;
break;
}
}
( run in 0.497 second using v1.01-cache-2.11-cpan-0bd6704ced7 )