Alien-FreeImage
view release on metacpan or search on metacpan
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
#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
#define GIF_PACKED_ID_LCTSORTED 0x20
#define GIF_PACKED_ID_RESERVED 0x18
#define GIF_PACKED_ID_LCTSIZE 0x07
#define GIF_PACKED_GCE_RESERVED 0xE0
#define GIF_PACKED_GCE_DISPOSAL 0x1C
#define GIF_PACKED_GCE_WAITINPUT 0x02
#define GIF_PACKED_GCE_HAVETRANS 0x01
#define GIF_BLOCK_IMAGE_DESCRIPTOR 0x2C
#define GIF_BLOCK_EXTENSION 0x21
#define GIF_BLOCK_TRAILER 0x3B
#define GIF_EXT_PLAINTEXT 0x01
#define GIF_EXT_GRAPHIC_CONTROL 0xF9
#define GIF_EXT_COMMENT 0xFE
#define GIF_EXT_APPLICATION 0xFF
#define GIF_INTERLACE_PASSES 4
static int g_GifInterlaceOffset[GIF_INTERLACE_PASSES] = {0, 4, 2, 1};
static int g_GifInterlaceIncrement[GIF_INTERLACE_PASSES] = {8, 8, 4, 2};
// ==========================================================
// Helpers Functions
// ==========================================================
static BOOL
FreeImage_SetMetadataEx(FREE_IMAGE_MDMODEL model, FIBITMAP *dib, const char *key, WORD id, FREE_IMAGE_MDTYPE type, DWORD count, DWORD length, const void *value)
{
BOOL bResult = FALSE;
FITAG *tag = FreeImage_CreateTag();
if(tag) {
FreeImage_SetTagKey(tag, key);
FreeImage_SetTagID(tag, id);
FreeImage_SetTagType(tag, type);
FreeImage_SetTagCount(tag, count);
FreeImage_SetTagLength(tag, length);
FreeImage_SetTagValue(tag, value);
if(model == FIMD_ANIMATION) {
TagLib& s = TagLib::instance();
// get the tag description
const char *description = s.getTagDescription(TagLib::ANIMATION, id);
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
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) {
FreeImage_OutputMessageProc(s_format_id, msg);
delete info;
return NULL;
}
} else {
//Header
io->write_proc((void *)"GIF89a", 6, 1, handle);
}
return info;
}
static void DLL_CALLCONV
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
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
for( int i = 0; i < count; i++ ) {
if( table[i] == 0 ) {
have_transparent = true;
transparent_color = i;
break;
}
}
}
//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);
src/Source/FreeImage/PluginGIF.cpp view on Meta::CPAN
//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 ) {
int size = 1 << bpp;
if( transparent_color <= size ) {
BYTE table[256];
memset(table, 0xFF, size);
table[transparent_color] = 0;
FreeImage_SetTransparencyTable(dib, table, size);
}
}
}
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "FrameTime", ANIMTAG_FRAMETIME, FIDT_LONG, 1, 4, &delay_time);
b = (BYTE)disposal_method;
FreeImage_SetMetadataEx(FIMD_ANIMATION, dib, "DisposalMethod", ANIMTAG_DISPOSALMETHOD, FIDT_BYTE, 1, 1, &b);
delete stringtable;
} catch (const char *msg) {
if( dib != NULL ) {
FreeImage_Unload(dib);
}
FreeImage_OutputMessageProc(s_format_id, msg);
return NULL;
}
return dib;
}
static BOOL DLL_CALLCONV
Save(FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int page, int flags, void *data) {
if( data == NULL ) {
return FALSE;
}
//GIFinfo *info = (GIFinfo *)data;
if( page == -1 ) {
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...
( run in 1.266 second using v1.01-cache-2.11-cpan-63c85eba8c4 )