/* vim:expandtab:ts=2 sw=2:
*/
/* Grafx2 - The Ultimate 256-color bitmap paint program
Copyright 2011 Pawel Góralski
Copyright 2009 Petter Lindquist
Copyright 2008 Yves Rizoud
Copyright 2008 Franck Charlet
Copyright 2007 Adrien Destugues
Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)
Grafx2 is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2
of the License.
Grafx2 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grafx2; if not, see
*/
///@file fileformats.c
/// Saving and loading different picture formats.
#ifndef __no_pnglib__
#include
#if !defined(PNG_HAVE_PLTE)
#define PNG_HAVE_PLTE 0x02
#endif
#if (PNG_LIBPNG_VER_MAJOR <= 1) && (PNG_LIBPNG_VER_MINOR < 4)
// Compatibility layer to allow us to use libng 1.4 or any older one.
// This function is renamed in 1.4
#define png_set_expand_gray_1_2_4_to_8(x) png_set_gray_1_2_4_to_8(x)
// Wrappers that are mandatory in 1.4. Older version allowed direct access.
#define png_get_rowbytes(png_ptr,info_ptr) ((info_ptr)->rowbytes)
#define png_get_image_width(png_ptr,info_ptr) ((info_ptr)->width)
#define png_get_image_height(png_ptr,info_ptr) ((info_ptr)->height)
#define png_get_bit_depth(png_ptr,info_ptr) ((info_ptr)->bit_depth)
#define png_get_color_type(png_ptr,info_ptr) ((info_ptr)->color_type)
#endif
#endif
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
#include
#include "errors.h"
#include "global.h"
#include "loadsave.h"
#include "misc.h"
#include "struct.h"
#include "io.h"
#include "pages.h"
#include "windows.h" // Best_color()
//////////////////////////////////// IMG ////////////////////////////////////
// -- Tester si un fichier est au format IMG --------------------------------
void Test_IMG(T_IO_Context * context)
{
FILE *file; // Fichier du fichier
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
T_IMG_Header IMG_header;
byte signature[6]={0x01,0x00,0x47,0x12,0x6D,0xB0};
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=1;
// Ouverture du fichier
if ((file=fopen(filename, "rb")))
{
// Lecture et vérification de la signature
if (Read_bytes(file,IMG_header.Filler1,6)
&& Read_word_le(file,&(IMG_header.Width))
&& Read_word_le(file,&(IMG_header.Height))
&& Read_bytes(file,IMG_header.Filler2,118)
&& Read_bytes(file,IMG_header.Palette,sizeof(T_Palette))
)
{
if ( (!memcmp(IMG_header.Filler1,signature,6))
&& IMG_header.Width && IMG_header.Height)
File_error=0;
}
// Fermeture du fichier
fclose(file);
}
}
// -- Lire un fichier au format IMG -----------------------------------------
void Load_IMG(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
byte * buffer;
FILE *file;
word x_pos,y_pos;
long width_read;
long file_size;
T_IMG_Header IMG_header;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename, "rb")))
{
file_size=File_length_file(file);
if (Read_bytes(file,IMG_header.Filler1,6)
&& Read_word_le(file,&(IMG_header.Width))
&& Read_word_le(file,&(IMG_header.Height))
&& Read_bytes(file,IMG_header.Filler2,118)
&& Read_bytes(file,IMG_header.Palette,sizeof(T_Palette))
)
{
buffer=(byte *)malloc(IMG_header.Width);
Pre_load(context, IMG_header.Width,IMG_header.Height,file_size,FORMAT_IMG,PIXEL_SIMPLE,0);
if (File_error==0)
{
memcpy(context->Palette,IMG_header.Palette,sizeof(T_Palette));
context->Width=IMG_header.Width;
context->Height=IMG_header.Height;
width_read=IMG_header.Width;
for (y_pos=0;(y_posHeight) && (!File_error);y_pos++)
{
if (Read_bytes(file,buffer,context->Width))
{
for (x_pos=0; x_posWidth;x_pos++)
Set_pixel(context, x_pos,y_pos,buffer[x_pos]);
}
else
File_error=2;
}
}
free(buffer);
buffer = NULL;
}
else
File_error=1;
fclose(file);
}
else
File_error=1;
}
// -- Sauver un fichier au format IMG ---------------------------------------
void Save_IMG(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
FILE *file;
short x_pos,y_pos;
T_IMG_Header IMG_header;
byte signature[6]={0x01,0x00,0x47,0x12,0x6D,0xB0};
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
// Ouverture du fichier
if ((file=fopen(filename,"wb")))
{
setvbuf(file, NULL, _IOFBF, 64*1024);
memcpy(IMG_header.Filler1,signature,6);
IMG_header.Width=context->Width;
IMG_header.Height=context->Height;
memset(IMG_header.Filler2,0,118);
IMG_header.Filler2[4]=0xFF;
IMG_header.Filler2[22]=64; // Lo(Longueur de la signature)
IMG_header.Filler2[23]=0; // Hi(Longueur de la signature)
memcpy(IMG_header.Filler2+23,"GRAFX2 by SunsetDesign (IMG format taken from PV (c)W.Wiedmann)",64);
memcpy(IMG_header.Palette,context->Palette,sizeof(T_Palette));
if (Write_bytes(file,IMG_header.Filler1,6)
&& Write_word_le(file,IMG_header.Width)
&& Write_word_le(file,IMG_header.Height)
&& Write_bytes(file,IMG_header.Filler2,118)
&& Write_bytes(file,IMG_header.Palette,sizeof(T_Palette))
)
{
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
for (x_pos=0; x_posWidth; x_pos++)
Write_one_byte(file,Get_pixel(context, x_pos,y_pos));
fclose(file);
if (File_error)
remove(filename);
}
else // Error d'écriture (disque plein ou protégé)
{
fclose(file);
remove(filename);
File_error=1;
}
}
else
{
fclose(file);
remove(filename);
File_error=1;
}
}
//////////////////////////////////// IFF ////////////////////////////////////
typedef struct
{
word Width;
word Height;
word X_org; // Inutile
word Y_org; // Inutile
byte BitPlanes;
byte Mask;
byte Compression;
byte Pad1; // Inutile
word Transp_col;
byte X_aspect; // Inutile
byte Y_aspect; // Inutile
word X_screen;
word Y_screen;
} T_IFF_Header;
byte * IFF_buffer;
FILE *IFF_file;
// -- Tester si un fichier est au format IFF --------------------------------
void Test_IFF(T_IO_Context * context, const char *sub_type)
{
char filename[MAX_PATH_CHARACTERS];
char format[4];
char section[4];
dword dummy;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=1;
if ((IFF_file=fopen(filename, "rb")))
{
do // Dummy loop, so that all breaks jump to end.
{
if (! Read_bytes(IFF_file,section,4))
break;
if (memcmp(section,"FORM",4))
break;
if (! Read_dword_be(IFF_file, &dummy))
break;
// On aurait pu vérifier que ce long est égal à la taille
// du fichier - 8, mais ça aurait interdit de charger des
// fichiers tronqués (et déjà que c'est chiant de perdre
// une partie du fichier il faut quand même pouvoir en
// garder un peu... Sinon, moi je pleure :'( !!! )
if (! Read_bytes(IFF_file,format,4))
break;
if (!memcmp(format,"ANIM",4))
{
// An ANIM header: need to check that it encloses an image
if (! Read_bytes(IFF_file,section,4))
break;
if (memcmp(section,"FORM",4))
break;
if (! Read_dword_be(IFF_file, &dummy))
break;
if (! Read_bytes(IFF_file,format,4))
break;
}
if ( memcmp(format,sub_type,4))
break;
// If we reach this part, file is indeed ILBM/PBM or ANIM
File_error=0;
} while (0);
fclose(IFF_file);
}
}
void Test_PBM(T_IO_Context * context)
{
Test_IFF(context, "PBM ");
}
void Test_LBM(T_IO_Context * context)
{
Test_IFF(context, "ILBM");
}
// -- Lire un fichier au format IFF -----------------------------------------
byte Image_HAM;
// ---------------- Adapter la palette pour les images HAM ----------------
void Adapt_palette_HAM(T_IO_Context * context)
{
short i,j,temp;
byte color;
if (Image_HAM==6)
{
for (i=1; i<=14; i++)
{
// On recopie a palette de base
memcpy(context->Palette+(i<<4),context->Palette,48);
// On modifie les teintes de cette palette
for (j=0; j<16; j++)
{
color=(i<<4)+j;
if (i<=7)
{
if (i&1)
{
temp=context->Palette[j].R+16;
context->Palette[color].R=(temp<63)?temp:63;
}
if (i&2)
{
temp=context->Palette[j].G+16;
context->Palette[color].G=(temp<63)?temp:63;
}
if (i&4)
{
temp=context->Palette[j].B+16;
context->Palette[color].B=(temp<63)?temp:63;
}
}
else
{
if ((i-7)&1)
{
temp=context->Palette[j].R-16;
context->Palette[color].R=(temp>=0)?temp:0;
}
if ((i-7)&2)
{
temp=context->Palette[j].G-16;
context->Palette[color].G=(temp>=0)?temp:0;
}
if ((i-7)&4)
{
temp=context->Palette[j].B-16;
context->Palette[color].B=(temp>=0)?temp:0;
}
}
}
}
// Ici, il reste les 16 dernières couleurs à modifier
for (i=240,j=0; j<16; i++,j++)
{
temp=context->Palette[j].R+8;
context->Palette[i].R=(temp<63)?temp:63;
temp=context->Palette[j].G+8;
context->Palette[i].G=(temp<63)?temp:63;
temp=context->Palette[j].B+8;
context->Palette[i].B=(temp<63)?temp:63;
}
}
else if (Image_HAM==8)
{
for (i=1; i<=3; i++)
{
// On recopie la palette de base
memcpy(context->Palette+(i<<6),context->Palette,192);
// On modifie les teintes de cette palette
for (j=0; j<64; j++)
{
color=(i<<6)+j;
switch (i)
{
case 1 :
temp=context->Palette[j].R+16;
context->Palette[color].R=(temp<63)?temp:63;
break;
case 2 :
temp=context->Palette[j].G+16;
context->Palette[color].G=(temp<63)?temp:63;
break;
default:
temp=context->Palette[j].B+16;
context->Palette[color].B=(temp<63)?temp:63;
}
}
}
}
else // Image 64 couleurs sauvée en 32.
{
for (i=0; i<32; i++)
{
j=i+32;
context->Palette[j].R=context->Palette[i].R>>1;
context->Palette[j].G=context->Palette[i].G>>1;
context->Palette[j].B=context->Palette[i].B>>1;
}
}
}
// Inspired by Allegro: storing a 4-character identifier as a 32bit litteral
#define ID4(a,b,c,d) ((((a)&255)<<24) | (((b)&255)<<16) | (((c)&255)<<8) | (((d)&255)))
/// Skips the current section in an IFF file.
/// This function should be called while the file pointer is right
/// after the 4-character code that identifies the section.
int IFF_Skip_section(void)
{
dword size;
if (!Read_dword_be(IFF_file,&size))
return 0;
if (size&1)
size++;
if (fseek(IFF_file,size,SEEK_CUR))
return 0;
return 1;
}
// ------------------------- Attendre une section -------------------------
byte IFF_Wait_for(byte * expected_section)
{
// Valeur retournée: 1=Section trouvée, 0=Section non trouvée (erreur)
byte section_read[4];
if (! Read_bytes(IFF_file,section_read,4))
return 0;
while (memcmp(section_read,expected_section,4)) // Sect. pas encore trouvée
{
if (!IFF_Skip_section())
return 0;
if (! Read_bytes(IFF_file,section_read,4))
return 0;
}
return 1;
}
// Les images ILBM sont stockés en bitplanes donc on doit trifouiller les bits pour
// en faire du chunky
///
/// Decodes the color of one pixel from the ILBM line buffer.
/// @param x_pos Position of the pixel in graphic line
/// @param real_line_size Width of one bitplane in memory, in bytes
/// @param bitplanes Number of bitplanes
byte Get_IFF_color(word x_pos, word real_line_size, byte bitplanes)
{
byte shift = 7 - (x_pos & 7);
int address,masked_bit,plane;
byte color=0;
for(plane=bitplanes-1;plane>=0;plane--)
{
address = (real_line_size * plane + x_pos) >> 3;
masked_bit = (IFF_buffer[address] >> shift) & 1;
color = (color << 1) + masked_bit;
}
return color;
}
void Set_IFF_color(word x_pos, byte color, word real_line_size, byte bitplanes)
{
byte shift = 7 - (x_pos & 7);
int address, plane;
for(plane=0;plane> 3;
IFF_buffer[address] |= (color&1) << shift;
color = color >> 1;
}
}
// ----------------------- Afficher une ligne ILBM ------------------------
void Draw_IFF_line(T_IO_Context *context, short y_pos, short real_line_size, byte bitplanes)
{
byte color;
byte red,green,blue;
byte temp;
short x_pos;
if (Image_HAM<=1) // ILBM
{
for (x_pos=0; x_posWidth; x_pos++)
{
Set_pixel(context, x_pos,y_pos,Get_IFF_color(x_pos,real_line_size, bitplanes));
}
}
else
{
color=0;
red=context->Palette[0].R;
green =context->Palette[0].G;
blue =context->Palette[0].B;
if (Image_HAM==6)
for (x_pos=0; x_posWidth; x_pos++) // HAM6
{
temp=Get_IFF_color(x_pos,real_line_size, bitplanes);
switch (temp & 0xF0)
{
case 0x10: // blue
blue=(temp&0x0F)<<2;
color=Best_color(red,green,blue);
break;
case 0x20: // red
red=(temp&0x0F)<<2;
color=Best_color(red,green,blue);
break;
case 0x30: // green
green=(temp&0x0F)<<2;
color=Best_color(red,green,blue);
break;
default: // Nouvelle couleur
color=temp;
red=context->Palette[color].R;
green =context->Palette[color].G;
blue =context->Palette[color].B;
}
Set_pixel(context, x_pos,y_pos,color);
}
else
for (x_pos=0; x_posWidth; x_pos++) // HAM8
{
temp=Get_IFF_color(x_pos,real_line_size, bitplanes);
switch (temp & 0x03)
{
case 0x01: // blue
blue=temp>>2;
color=Best_color(red,green,blue);
break;
case 0x02: // red
red=temp>>2;
color=Best_color(red,green,blue);
break;
case 0x03: // green
green=temp>>2;
color=Best_color(red,green,blue);
break;
default: // Nouvelle couleur
color=temp;
red=context->Palette[color].R;
green =context->Palette[color].G;
blue =context->Palette[color].B;
}
Set_pixel(context, x_pos,y_pos,color);
}
}
}
void Load_IFF(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
T_IFF_Header header;
char format[4];
char section[4];
byte temp_byte;
short b256;
dword nb_colors;
dword section_size;
short x_pos;
short y_pos;
short counter;
short line_size; // Taille d'une ligne en octets
short real_line_size; // Taille d'une ligne en pixels
byte color;
long file_size;
dword dummy;
byte is_anim=0;
int iff_format;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((IFF_file=fopen(filename, "rb")))
{
file_size=File_length_file(IFF_file);
// FORM + size(4)
Read_bytes(IFF_file,section,4);
Read_dword_be(IFF_file,&dummy);
Read_bytes(IFF_file,format,4);
if (!memcmp(format,"ANIM",4))
{
is_anim=1;
// Skip a bit, brother
Read_bytes(IFF_file,section,4);
Read_dword_be(IFF_file,&dummy);
Read_bytes(IFF_file,format,4);
}
if (!memcmp(format,"ILBM",4))
iff_format = FORMAT_LBM;
else
iff_format = FORMAT_PBM;
if (!IFF_Wait_for((byte *)"BMHD"))
File_error=1;
Read_dword_be(IFF_file,&dummy);
// Maintenant on lit le header pour pouvoir commencer le chargement de l'image
if ( (Read_word_be(IFF_file,&header.Width))
&& (Read_word_be(IFF_file,&header.Height))
&& (Read_word_be(IFF_file,&header.X_org))
&& (Read_word_be(IFF_file,&header.Y_org))
&& (Read_byte(IFF_file,&header.BitPlanes))
&& (Read_byte(IFF_file,&header.Mask))
&& (Read_byte(IFF_file,&header.Compression))
&& (Read_byte(IFF_file,&header.Pad1))
&& (Read_word_be(IFF_file,&header.Transp_col))
&& (Read_byte(IFF_file,&header.X_aspect))
&& (Read_byte(IFF_file,&header.Y_aspect))
&& (Read_word_be(IFF_file,&header.X_screen))
&& (Read_word_be(IFF_file,&header.Y_screen))
&& header.Width && header.Height)
{
if ( (header.BitPlanes) && (IFF_Wait_for((byte *)"CMAP")) )
{
Read_dword_be(IFF_file,&nb_colors);
nb_colors/=3;
if (((dword)1< il faut copier les 32 coul.
} // sur les 32 suivantes et assombrir ces dernières.
else
{
if ((header.BitPlanes==6) || (header.BitPlanes==8))
Image_HAM=header.BitPlanes;
else
/* File_error=1;*/ /* C'est censé être incorrect mais j'ai */
Image_HAM=0; /* trouvé un fichier comme ça, alors... */
}
}
else
Image_HAM=0;
if ( (!File_error) && (nb_colors>=2) && (nb_colors<=256) )
{
if (header.Mask==1)
header.BitPlanes++;
// Deluxe paint le fait... alors on le fait...
Back_color=header.Transp_col;
if (Config.Clear_palette)
memset(context->Palette,0,sizeof(T_Palette));
// On peut maintenant charger la nouvelle palette
if (Read_bytes(IFF_file,context->Palette,3*nb_colors))
{
if (Image_HAM)
{
Palette_256_to_64(context->Palette);
Adapt_palette_HAM(context);
Palette_64_to_256(context->Palette);
}
// On lit l'octet de padding du CMAP si la taille est impaire
if (nb_colors&1)
if (Read_byte(IFF_file,&temp_byte))
File_error=20;
// Keep reading sections until we find the body
while (1)
{
if (! Read_bytes(IFF_file,section,4))
{
File_error=46;
break;
}
// Found body : stop searching
if (!memcmp(section,"BODY",4))
break;
else if (!memcmp(section,"CRNG",4))
{
// Handle CRNG
// The content of a CRNG is as follows:
word padding;
word rate;
word flags;
byte min_col;
byte max_col;
//
if ( (Read_dword_be(IFF_file,§ion_size))
&& (Read_word_be(IFF_file,&padding))
&& (Read_word_be(IFF_file,&rate))
&& (Read_word_be(IFF_file,&flags))
&& (Read_byte(IFF_file,&min_col))
&& (Read_byte(IFF_file,&max_col)))
{
if (section_size == 8 && min_col != max_col)
{
// Valid cycling range
if (max_colCycle_range[context->Color_cycles].Start=min_col;
context->Cycle_range[context->Color_cycles].End=max_col;
context->Cycle_range[context->Color_cycles].Inverse=(flags&2)?1:0;
context->Cycle_range[context->Color_cycles].Speed=(flags&1) ? rate/78 : 0;
context->Color_cycles++;
}
}
else
{
File_error=47;
break;
}
}
else
{
// ignore any number of unknown sections
if (!IFF_Skip_section())
{
File_error=48;
break;
}
}
}
if ( !File_error )
{
Read_dword_be(IFF_file,§ion_size);
context->Width = header.Width;
context->Height = header.Height;
Original_screen_X = header.X_screen;
Original_screen_Y = header.Y_screen;
Pre_load(context, context->Width,context->Height,file_size,iff_format,PIXEL_SIMPLE,0);
context->Background_transparent = header.Mask == 2;
context->Transparent_color = context->Background_transparent ? header.Transp_col : 0;
if (context->Type == CONTEXT_MAIN_IMAGE)
{
Main_backups->Pages->Image_mode = IMAGE_MODE_ANIMATION;
Update_screen_targets();
}
if (File_error==0)
{
if (!memcmp(format,"ILBM",4)) // "ILBM": InterLeaved BitMap
{
// Calcul de la taille d'une ligne ILBM (pour les images ayant des dimensions exotiques)
if (context->Width & 15)
{
real_line_size=( (context->Width+16) >> 4 ) << 4;
line_size=( (context->Width+16) >> 4 )*(header.BitPlanes<<1);
}
else
{
real_line_size=context->Width;
line_size=(context->Width>>3)*header.BitPlanes;
}
if (!header.Compression)
{ // non compressé
IFF_buffer=(byte *)malloc(line_size);
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
if (Read_bytes(IFF_file,IFF_buffer,line_size))
Draw_IFF_line(context, y_pos,real_line_size, header.BitPlanes);
else
File_error=21;
}
free(IFF_buffer);
IFF_buffer = NULL;
}
else
{ // compressé
/*Init_lecture();*/
IFF_buffer=(byte *)malloc(line_size);
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
for (x_pos=0; ((x_pos 127 alors il faut répéter 256-'temp_byte' fois la couleur de l'octet suivant
// Si temp_byte <= 127 alors il faut afficher directement les 'temp_byte' octets suivants
if (temp_byte>127)
{
if(Read_byte(IFF_file, &color)!=1)
{
File_error=23;
break;
}
b256=(short)(256-temp_byte);
for (counter=0; counter<=b256; counter++)
if (x_pos=line_size || Read_byte(IFF_file, &(IFF_buffer[x_pos++]))!=1)
File_error=25;
}
if (!File_error)
Draw_IFF_line(context, y_pos,real_line_size,header.BitPlanes);
}
free(IFF_buffer);
IFF_buffer = NULL;
/*Close_lecture();*/
}
}
else // "PBM ": Planar(?) BitMap
{
real_line_size=context->Width+(context->Width&1);
if (!header.Compression)
{ // non compressé
IFF_buffer=(byte *)malloc(real_line_size);
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
if (Read_bytes(IFF_file,IFF_buffer,real_line_size))
for (x_pos=0; x_posWidth; x_pos++)
Set_pixel(context, x_pos,y_pos,IFF_buffer[x_pos]);
else
File_error=26;
}
free(IFF_buffer);
IFF_buffer = NULL;
}
else
{ // compressé
/*Init_lecture();*/
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
for (x_pos=0; ((x_pos127)
{
if(Read_byte(IFF_file, &color)!=1)
{
File_error=28;
break;
}
b256=256-temp_byte;
for (counter=0; counter<=b256; counter++)
Set_pixel(context, x_pos++,y_pos,color);
}
else
for (counter=0; counter<=temp_byte; counter++)
{
byte byte_read=0;
if(Read_byte(IFF_file, &byte_read)!=1)
{
File_error=29;
break;
}
Set_pixel(context, x_pos++,y_pos,byte_read);
}
}
}
/*Close_lecture();*/
}
}
/*
while (!File_error && is_anim)
{
dword delta_size;
// Just loaded the first image successfully : now keep reading
// FORM + size(4)
if (!Read_bytes(IFF_file,section,4))
break;
Read_dword_be(IFF_file,&dummy);
// ILBM, hopefully
Read_bytes(IFF_file,format,4);
if (!IFF_Wait_for((byte *)"DLTA"))
{
File_error=1;
break;
}
Set_loading_layer(context, context->Current_layer+1);
Read_dword_be(IFF_file,&delta_size);
fseek(IFF_file, delta_size + (delta_size & 1), SEEK_CUR);
}
*/
}
}
else
Set_file_error(2);
}
else
{
File_error=1;
}
}
else
Set_file_error(1);
}
else
File_error=1;
}
else
File_error=1;
fclose(IFF_file);
}
else
File_error=1;
}
// -- Sauver un fichier au format IFF ---------------------------------------
byte IFF_color_list[129];
word IFF_list_size;
byte IFF_repetition_mode;
// ------------- Ecrire les couleurs que l'on vient de traiter ------------
void Transfer_colors(void)
{
byte index;
if (IFF_list_size>0)
{
if (IFF_repetition_mode)
{
Write_one_byte(IFF_file,257-IFF_list_size);
Write_one_byte(IFF_file,IFF_color_list[0]);
}
else
{
Write_one_byte(IFF_file,IFF_list_size-1);
for (index=0; index et on a 3 couleurs qui se suivent
{
IFF_list_size-=2;
Transfer_colors();
IFF_color_list[0]=color;
IFF_color_list[1]=color;
IFF_color_list[2]=color;
IFF_list_size=3;
IFF_repetition_mode=1;
}
}
else // La couleur n'est pas la même que la précédente
{
if (!IFF_repetition_mode) // On conserve le mode...
{
IFF_color_list[IFF_list_size++]=color;
if (IFF_list_size==128)
Transfer_colors();
}
else // On change de mode...
{
Transfer_colors();
IFF_color_list[IFF_list_size]=color;
IFF_list_size++;
}
}
}
}
void Save_IFF(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
T_IFF_Header header;
word x_pos;
word y_pos;
byte temp_byte;
int file_size;
int i;
int palette_entries;
byte bit_depth;
if (context->Format == FORMAT_LBM)
{
// Check how many bits are used by pixel colors
for (y_pos=0; y_posHeight; y_pos++)
for (x_pos=0; x_posWidth; x_pos++)
temp_byte |= Get_pixel(context, x_pos,y_pos);
bit_depth=0;
do
{
bit_depth++;
temp_byte>>=1;
} while (temp_byte);
}
else // FORMAT_PBM
{
bit_depth=8;
}
palette_entries = 1<File_name, context->File_directory);
// Ouverture du fichier
if ((IFF_file=fopen(filename,"wb")))
{
setvbuf(IFF_file, NULL, _IOFBF, 64*1024);
Write_bytes(IFF_file,"FORM",4);
Write_dword_be(IFF_file,0); // On mettra la taille à jour à la fin
if (context->Format == FORMAT_LBM)
Write_bytes(IFF_file,"ILBM",4);
else
Write_bytes(IFF_file,"PBM ",4);
Write_bytes(IFF_file,"BMHD",4);
Write_dword_be(IFF_file,20);
header.Width=context->Width;
header.Height=context->Height;
header.X_org=0;
header.Y_org=0;
header.BitPlanes=bit_depth;
header.Mask=context->Background_transparent ? 2 : 0;
header.Compression=1;
header.Pad1=0;
header.Transp_col=context->Background_transparent ? context->Transparent_color : 0;
header.X_aspect=context->Ratio == PIXEL_WIDE ? 2 : 1;
header.Y_aspect=context->Ratio == PIXEL_TALL ? 2 : 1;
header.X_screen = context->Width;// Screen_width?;
header.Y_screen = context->Height;// Screen_height?;
Write_word_be(IFF_file,header.Width);
Write_word_be(IFF_file,header.Height);
Write_word_be(IFF_file,header.X_org);
Write_word_be(IFF_file,header.Y_org);
Write_bytes(IFF_file,&header.BitPlanes,1);
Write_bytes(IFF_file,&header.Mask,1);
Write_bytes(IFF_file,&header.Compression,1);
Write_bytes(IFF_file,&header.Pad1,1);
Write_word_be(IFF_file,header.Transp_col);
Write_bytes(IFF_file,&header.X_aspect,1);
Write_bytes(IFF_file,&header.Y_aspect,1);
Write_word_be(IFF_file,header.X_screen);
Write_word_be(IFF_file,header.Y_screen);
Write_bytes(IFF_file,"CMAP",4);
Write_dword_be(IFF_file,palette_entries*3);
Write_bytes(IFF_file,context->Palette,palette_entries*3);
for (i=0; iColor_cycles; i++)
{
word flags=0;
flags|= context->Cycle_range[i].Speed?1:0; // Cycling or not
flags|= context->Cycle_range[i].Inverse?2:0; // Inverted
Write_bytes(IFF_file,"CRNG",4);
Write_dword_be(IFF_file,8); // Section size
Write_word_be(IFF_file,0); // Padding
Write_word_be(IFF_file,context->Cycle_range[i].Speed*78); // Rate
Write_word_be(IFF_file,flags); // Flags
Write_byte(IFF_file,context->Cycle_range[i].Start); // Min color
Write_byte(IFF_file,context->Cycle_range[i].End); // Max color
// No padding, size is multiple of 2
}
Write_bytes(IFF_file,"BODY",4);
Write_dword_be(IFF_file,0); // On mettra la taille à jour à la fin
if (context->Format == FORMAT_LBM)
{
short line_size; // Size of line in bytes
short real_line_size; // Size of line in pixels
// Calcul de la taille d'une ligne ILBM (pour les images ayant des dimensions exotiques)
if (context->Width & 15)
{
real_line_size=( (context->Width+16) >> 4 ) << 4;
line_size=( (context->Width+16) >> 4 )*(header.BitPlanes<<1);
}
else
{
real_line_size=context->Width;
line_size=(context->Width>>3)*header.BitPlanes;
}
IFF_buffer=(byte *)malloc(line_size);
// Start encoding
IFF_list_size=0;
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
// Dispatch the pixel into planes
memset(IFF_buffer,0,line_size);
for (x_pos=0; x_posWidth; x_pos++)
Set_IFF_color(x_pos, Get_pixel(context, x_pos,y_pos), real_line_size, header.BitPlanes);
if (context->Width&1) // odd width fix
Set_IFF_color(x_pos, 0, real_line_size, header.BitPlanes);
// encode the resulting sequence of bytes
if (header.Compression)
{
int plane_width=line_size/header.BitPlanes;
int plane;
for (plane=0; planeHeight) && (!File_error)); y_pos++)
{
for (x_pos=0; ((x_posWidth) && (!File_error)); x_pos++)
New_color(Get_pixel(context, x_pos,y_pos));
if (context->Width&1) // odd width fix
New_color(0);
if (!File_error)
Transfer_colors();
}
}
fclose(IFF_file);
if (!File_error)
{
file_size=File_length(filename);
IFF_file=fopen(filename,"rb+");
fseek(IFF_file,52+palette_entries*3+context->Color_cycles*16,SEEK_SET);
Write_dword_be(IFF_file,file_size-56-palette_entries*3-context->Color_cycles*16);
if (!File_error)
{
fseek(IFF_file,4,SEEK_SET);
// Si la taille de la section de l'image (taille fichier-8) est
// impaire, on rajoute un 0 (Padding) à la fin.
if ((file_size) & 1)
{
Write_dword_be(IFF_file,file_size-7);
fseek(IFF_file,0,SEEK_END);
temp_byte=0;
if (! Write_bytes(IFF_file,&temp_byte,1))
File_error=1;
}
else
Write_dword_be(IFF_file,file_size-8);
fclose(IFF_file);
if (File_error)
remove(filename);
}
else
{
File_error=1;
fclose(IFF_file);
remove(filename);
}
}
else // Il y a eu une erreur lors du compactage => on efface le fichier
remove(filename);
}
else
File_error=1;
}
//////////////////////////////////// BMP ////////////////////////////////////
typedef struct
{
byte Signature[2]; // ='BM' = 0x4D42
dword Size_1; // file size
word Reserved_1; // 0
word Reserved_2; // 0
dword Offset; // Offset of bitmap data start
dword Size_2; // 40
dword Width;
int32_t Height; // signed: negative means a top-down bitmap (rare)
word Planes; // 1
word Nb_bits; // 1,4,8 ou 24
dword Compression;
dword Size_3;
dword XPM;
dword YPM;
dword Nb_Clr;
dword Clr_Imprt;
} T_BMP_Header;
// -- Tester si un fichier est au format BMP --------------------------------
void Test_BMP(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
T_BMP_Header header;
File_error=1;
Get_full_filename(filename, context->File_name, context->File_directory);
if ((file=fopen(filename, "rb")))
{
if (Read_bytes(file,&(header.Signature),2) // "BM"
&& Read_dword_le(file,&(header.Size_1))
&& Read_word_le(file,&(header.Reserved_1))
&& Read_word_le(file,&(header.Reserved_2))
&& Read_dword_le(file,&(header.Offset))
&& Read_dword_le(file,&(header.Size_2))
&& Read_dword_le(file,&(header.Width))
&& Read_dword_le(file,(dword *)&(header.Height))
&& Read_word_le(file,&(header.Planes))
&& Read_word_le(file,&(header.Nb_bits))
&& Read_dword_le(file,&(header.Compression))
&& Read_dword_le(file,&(header.Size_3))
&& Read_dword_le(file,&(header.XPM))
&& Read_dword_le(file,&(header.YPM))
&& Read_dword_le(file,&(header.Nb_Clr))
&& Read_dword_le(file,&(header.Clr_Imprt))
)
{
if ( header.Signature[0]=='B' && header.Signature[1]=='M'
&& header.Size_2==40
&& header.Width && header.Height )
File_error=0;
}
fclose(file);
}
}
// Find the 8 important bits in a dword
byte Bitmap_mask(dword pixel, dword mask)
{
byte result;
int i;
int bits_found;
switch(mask)
{
// Shortcuts to quickly handle the common 24/32bit cases
case 0x000000FF:
return (pixel & 0x000000FF);
case 0x0000FF00:
return (pixel & 0x0000FF00)>>8;
case 0x00FF0000:
return (pixel & 0x00FF0000)>>16;
case 0xFF000000:
return (pixel & 0xFF000000)>>24;
}
// Uncommon : do it bit by bit.
bits_found=0;
result=0;
// Process the mask from low to high bit
for (i=0;i<32;i++)
{
// Found a bit in the mask
if (mask & (1<=8)
return result;
}
}
// Less than 8 bits in the mask: scale the result to 8 bits
return result << (8-bits_found);
}
// -- Charger un fichier au format BMP --------------------------------------
void Load_BMP(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
T_BMP_Header header;
byte * buffer;
word index;
byte local_palette[256][4]; // R,G,B,0
word nb_colors = 0;
short x_pos;
short y_pos;
word line_size;
byte a,b,c=0;
long file_size;
byte negative_height;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename, "rb")))
{
file_size=File_length_file(file);
if (Read_bytes(file,header.Signature,2)
&& Read_dword_le(file,&(header.Size_1))
&& Read_word_le(file,&(header.Reserved_1))
&& Read_word_le(file,&(header.Reserved_2))
&& Read_dword_le(file,&(header.Offset))
&& Read_dword_le(file,&(header.Size_2))
&& Read_dword_le(file,&(header.Width))
&& Read_dword_le(file,(dword *)&(header.Height))
&& Read_word_le(file,&(header.Planes))
&& Read_word_le(file,&(header.Nb_bits))
&& Read_dword_le(file,&(header.Compression))
&& Read_dword_le(file,&(header.Size_3))
&& Read_dword_le(file,&(header.XPM))
&& Read_dword_le(file,&(header.YPM))
&& Read_dword_le(file,&(header.Nb_Clr))
&& Read_dword_le(file,&(header.Clr_Imprt))
)
{
switch (header.Nb_bits)
{
case 1 :
case 4 :
case 8 :
if (header.Nb_Clr)
nb_colors=header.Nb_Clr;
else
nb_colors=1<Palette,0,sizeof(T_Palette));
// On peut maintenant transférer la nouvelle palette
for (index=0; indexPalette[index].R=local_palette[index][2];
context->Palette[index].G=local_palette[index][1];
context->Palette[index].B=local_palette[index][0];
}
context->Width=header.Width;
context->Height=header.Height;
if (fseek(file, header.Offset, SEEK_SET))
File_error=2;
switch (header.Compression)
{
case 0 : // Pas de compression
line_size=context->Width;
x_pos=(32/header.Nb_bits); // x_pos sert de variable temporaire
// On arrondit line_size au premier multiple de x_pos supérieur
if (line_size % x_pos)
line_size=((line_size/x_pos)*x_pos)+x_pos;
// On convertit cette taille en octets
line_size=(line_size*header.Nb_bits)>>3;
buffer=(byte *)malloc(line_size);
for (y_pos=0; (y_pos < context->Height && !File_error); y_pos++)
{
short target_y;
target_y = negative_height ? y_pos : context->Height-1-y_pos;
if (Read_bytes(file,buffer,line_size))
for (x_pos=0; x_posWidth; x_pos++)
switch (header.Nb_bits)
{
case 8 :
Set_pixel(context, x_pos,target_y,buffer[x_pos]);
break;
case 4 :
if (x_pos & 1)
Set_pixel(context, x_pos,target_y,buffer[x_pos>>1] & 0xF);
else
Set_pixel(context, x_pos,target_y,buffer[x_pos>>1] >> 4 );
break;
case 1 :
if ( buffer[x_pos>>3] & (0x80>>(x_pos&7)) )
Set_pixel(context, x_pos,target_y,1);
else
Set_pixel(context, x_pos,target_y,0);
}
else
File_error=2;
}
free(buffer);
buffer = NULL;
break;
case 1 : // Compression RLE 8 bits
x_pos=0;
y_pos=context->Height-1;
/*Init_lecture();*/
if(Read_byte(file, &a)!=1 || Read_byte(file, &b)!=1)
File_error=2;
while (!File_error)
{
if (a) // Encoded mode
for (index=1; index<=a; index++)
Set_pixel(context, x_pos++,y_pos,b);
else // Absolute mode
switch (b)
{
case 0 : // End of line
x_pos=0;
y_pos--;
break;
case 1 : // End of bitmap
break;
case 2 : // Delta
if(Read_byte(file, &a)!=1 || Read_byte(file, &b)!=1)
File_error=2;
x_pos+=a;
y_pos-=b;
break;
default: // Nouvelle série
while (b)
{
if(Read_byte(file, &a)!=1)
File_error=2;
//Read_one_byte(file, &c);
Set_pixel(context, x_pos++,y_pos,a);
//if (--c)
//{
// Set_pixel(context, x_pos++,y_pos,c);
// b--;
//}
b--;
}
if (ftell(file) & 1) fseek(file, 1, SEEK_CUR);
}
if (a==0 && b==1)
break;
if(Read_byte(file, &a) !=1 || Read_byte(file, &b)!=1)
{
File_error=2;
}
}
/*Close_lecture();*/
break;
case 2 : // Compression RLE 4 bits
x_pos=0;
y_pos=context->Height-1;
/*Init_lecture();*/
if(Read_byte(file, &a)!=1 || Read_byte(file, &b) != 1)
File_error =2;
while ( (!File_error) && ((a)||(b!=1)) )
{
if (a) // Encoded mode (A fois les 1/2 pixels de B)
for (index=1; index<=a; index++)
{
if (index & 1)
Set_pixel(context, x_pos,y_pos,b>>4);
else
Set_pixel(context, x_pos,y_pos,b&0xF);
x_pos++;
}
else // Absolute mode
switch (b)
{
case 0 : //End of line
x_pos=0;
y_pos--;
break;
case 1 : // End of bitmap
break;
case 2 : // Delta
if(Read_byte(file, &a)!=1 || Read_byte(file, &b)!=1)
File_error=2;
x_pos+=a;
y_pos-=b;
break;
default: // Nouvelle série (B 1/2 pixels bruts)
for (index=1; ((index<=b) && (!File_error)); index++,x_pos++)
{
if (index&1)
{
if(Read_byte(file, &c)!=1) File_error=2;
Set_pixel(context, x_pos,y_pos,c>>4);
}
else
Set_pixel(context, x_pos,y_pos,c&0xF);
}
// On lit l'octet rendant le nombre d'octets pair, si
// nécessaire. Encore un truc de crétin "made in MS".
if ( ((b&3)==1) || ((b&3)==2) )
{
byte dummy;
if(Read_byte(file, &dummy)!=1) File_error=2;
}
}
if(Read_byte(file, &a)!=1 || Read_byte(file, &b)!=1) File_error=2;
}
/*Close_lecture();*/
}
fclose(file);
}
else
{
fclose(file);
File_error=1;
}
}
}
else
{
// Image 16/24/32 bits
dword red_mask;
dword green_mask;
dword blue_mask;
if (header.Nb_bits == 16)
{
red_mask = 0x00007C00;
green_mask = 0x000003E0;
blue_mask = 0x0000001F;
}
else
{
red_mask = 0x00FF0000;
green_mask = 0x0000FF00;
blue_mask = 0x000000FF;
}
File_error=0;
context->Width=header.Width;
context->Height=header.Height;
Pre_load(context,header.Width,header.Height,file_size,FORMAT_BMP,PIXEL_SIMPLE,1);
if (File_error==0)
{
switch (header.Compression)
{
case 3: // BI_BITFIELDS
if (!Read_dword_le(file,&red_mask) ||
!Read_dword_le(file,&green_mask) ||
!Read_dword_le(file,&blue_mask))
File_error=2;
break;
default:
break;
}
if (fseek(file, header.Offset, SEEK_SET))
File_error=2;
}
if (File_error==0)
{
switch (header.Nb_bits)
{
// 24bit bitmap
default:
case 24:
line_size=context->Width*3;
x_pos=(line_size % 4); // x_pos sert de variable temporaire
if (x_pos>0)
line_size+=(4-x_pos);
buffer=(byte *)malloc(line_size);
for (y_pos=0; (y_pos < context->Height && !File_error); y_pos++)
{
short target_y;
target_y = negative_height ? y_pos : context->Height-1-y_pos;
if (Read_bytes(file,buffer,line_size))
for (x_pos=0,index=0; x_posWidth; x_pos++,index+=3)
Set_pixel_24b(context, x_pos,target_y,buffer[index+2],buffer[index+1],buffer[index+0]);
else
File_error=2;
}
break;
// 32bit bitmap
case 32:
line_size=context->Width*4;
buffer=(byte *)malloc(line_size);
for (y_pos=0; (y_pos < context->Height && !File_error); y_pos++)
{
short target_y;
target_y = negative_height ? y_pos : context->Height-1-y_pos;
if (Read_bytes(file,buffer,line_size))
for (x_pos=0; x_posWidth; x_pos++)
{
dword pixel=*(((dword *)buffer)+x_pos);
Set_pixel_24b(context, x_pos,target_y,Bitmap_mask(pixel,red_mask),Bitmap_mask(pixel,green_mask),Bitmap_mask(pixel,blue_mask));
}
else
File_error=2;
}
break;
// 16bit bitmap
case 16:
line_size=(context->Width*2) + (context->Width&1)*2;
buffer=(byte *)malloc(line_size);
for (y_pos=0; (y_pos < context->Height && !File_error); y_pos++)
{
short target_y;
target_y = negative_height ? y_pos : context->Height-1-y_pos;
if (Read_bytes(file,buffer,line_size))
for (x_pos=0; x_posWidth; x_pos++)
{
word pixel=*(((word *)buffer)+x_pos);
Set_pixel_24b(context, x_pos,target_y,Bitmap_mask(pixel,red_mask),Bitmap_mask(pixel,green_mask),Bitmap_mask(pixel,blue_mask));
}
else
File_error=2;
}
break;
}
free(buffer);
buffer = NULL;
fclose(file);
}
}
}
else
{
fclose(file);
File_error=1;
}
}
else
File_error=1;
}
// -- Sauvegarder un fichier au format BMP ----------------------------------
void Save_BMP(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
T_BMP_Header header;
short x_pos;
short y_pos;
long line_size;
word index;
byte local_palette[256][4]; // R,G,B,0
File_error=0;
Get_full_filename(filename, context->File_name, context->File_directory);
// Ouverture du fichier
if ((file=fopen(filename,"wb")))
{
setvbuf(file, NULL, _IOFBF, 64*1024);
// Image width must be a multiple of 4 bytes
line_size = context->Width;
if (line_size & 3)
line_size += (4 - (line_size & 3));
header.Signature[0] = 'B';
header.Signature[1] = 'M';
header.Size_1 =(line_size*context->Height)+1078;
header.Reserved_1 =0;
header.Reserved_2 =0;
header.Offset =1078; // Size of header data (including palette)
header.Size_2 =40; // Size of header
header.Width =context->Width;
header.Height =context->Height;
header.Planes =1;
header.Nb_bits =8;
header.Compression=0;
header.Size_3 =0;
header.XPM =0;
header.YPM =0;
header.Nb_Clr =0;
header.Clr_Imprt =0;
if (Write_bytes(file,header.Signature,2)
&& Write_dword_le(file,header.Size_1)
&& Write_word_le(file,header.Reserved_1)
&& Write_word_le(file,header.Reserved_2)
&& Write_dword_le(file,header.Offset)
&& Write_dword_le(file,header.Size_2)
&& Write_dword_le(file,header.Width)
&& Write_dword_le(file,header.Height)
&& Write_word_le(file,header.Planes)
&& Write_word_le(file,header.Nb_bits)
&& Write_dword_le(file,header.Compression)
&& Write_dword_le(file,header.Size_3)
&& Write_dword_le(file,header.XPM)
&& Write_dword_le(file,header.YPM)
&& Write_dword_le(file,header.Nb_Clr)
&& Write_dword_le(file,header.Clr_Imprt))
{
// Chez Bill, ils ont dit: "On va mettre les couleur dans l'ordre
// inverse, et pour faire chier, on va les mettre sur une échelle de
// 0 à 255 parce que le standard VGA c'est de 0 à 63 (logique!). Et
// puis comme c'est pas assez débile, on va aussi y rajouter un octet
// toujours à 0 pour forcer les gens à s'acheter des gros disques
// durs... Comme ça, ça fera passer la pillule lorsqu'on sortira
// Windows 95." ...
for (index=0; index<256; index++)
{
local_palette[index][0]=context->Palette[index].B;
local_palette[index][1]=context->Palette[index].G;
local_palette[index][2]=context->Palette[index].R;
local_palette[index][3]=0;
}
if (Write_bytes(file,local_palette,1024))
{
// ... Et Bill, il a dit: "OK les gars! Mais seulement si vous rangez
// les pixels dans l'ordre inverse, mais que sur les Y quand-même
// parce que faut pas pousser."
for (y_pos=context->Height-1; ((y_pos>=0) && (!File_error)); y_pos--)
for (x_pos=0; x_posFile_name, context->File_directory);
if ((file=fopen(filename, "rb")))
{
if (
(Read_bytes(file,signature,6)) &&
((!memcmp(signature,"GIF87a",6))||(!memcmp(signature,"GIF89a",6)))
)
File_error=0;
fclose(file);
}
}
// -- Lire un fichier au format GIF -----------------------------------------
// -- Lire un fichier au format GIF -----------------------------------------
// Définition de quelques variables globales au chargement du GIF87a
word GIF_nb_bits; // Nb de bits composants un code complet
word GIF_remainder_bits; // Nb de bits encore dispos dans GIF_last_byte
byte GIF_remainder_byte; // Nb d'octets avant le prochain bloc de Raster Data
word GIF_current_code; // Code traité (qui vient d'être lu en général)
byte GIF_last_byte; // Octet de lecture des bits
word GIF_pos_X; // Coordonnées d'affichage de l'image
word GIF_pos_Y;
word GIF_interlaced; // L'image est entrelacée
word GIF_finished_interlaced_image; // L'image entrelacée est finie de charger
word GIF_pass; // index de passe de l'image entrelacée
FILE *GIF_file; // L'handle du fichier
// -- Lit le code à GIF_nb_bits suivant --
word GIF_get_next_code(void)
{
word nb_bits_to_process=GIF_nb_bits;
word nb_bits_processed =0;
word current_nb_bits;
GIF_current_code=0;
while (nb_bits_to_process)
{
if (GIF_remainder_bits==0) // Il ne reste plus de bits...
{
// Lire l'octet suivant:
// Si on a atteint la fin du bloc de Raster Data
if (GIF_remainder_byte==0)
// Lire l'octet nous donnant la taille du bloc de Raster Data suivant
if(Read_byte(GIF_file, &GIF_remainder_byte)!=1)
File_error=2;
if(Read_byte(GIF_file,&GIF_last_byte)!=1)
File_error = 2;
GIF_remainder_byte--;
GIF_remainder_bits=8;
}
current_nb_bits=(nb_bits_to_process<=GIF_remainder_bits)?nb_bits_to_process:GIF_remainder_bits;
GIF_current_code|=(GIF_last_byte & ((1<>=current_nb_bits;
nb_bits_processed +=current_nb_bits;
nb_bits_to_process-=current_nb_bits;
GIF_remainder_bits -=current_nb_bits;
}
return GIF_current_code;
}
// -- Affiche un nouveau pixel --
void GIF_new_pixel(T_IO_Context * context, T_GIF_IDB *idb, int is_transparent, byte color)
{
if (!is_transparent || color!=context->Transparent_color)
Set_pixel(context, idb->Pos_X+GIF_pos_X, idb->Pos_Y+GIF_pos_Y,color);
GIF_pos_X++;
if (GIF_pos_X>=idb->Image_width)
{
GIF_pos_X=0;
if (!GIF_interlaced)
GIF_pos_Y++;
else
{
switch (GIF_pass)
{
case 0 : GIF_pos_Y+=8;
break;
case 1 : GIF_pos_Y+=8;
break;
case 2 : GIF_pos_Y+=4;
break;
default: GIF_pos_Y+=2;
}
if (GIF_pos_Y>=idb->Image_height)
{
switch(++GIF_pass)
{
case 1 : GIF_pos_Y=4;
break;
case 2 : GIF_pos_Y=2;
break;
case 3 : GIF_pos_Y=1;
break;
case 4 : GIF_finished_interlaced_image=1;
}
}
}
}
}
void Load_GIF(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
char signature[6];
word * alphabet_stack; // Pile de décodage d'une chaîne
word * alphabet_prefix; // Table des préfixes des codes
word * alphabet_suffix; // Table des suffixes des codes
word alphabet_free; // Position libre dans l'alphabet
word alphabet_max; // Nombre d'entrées possibles dans l'alphabet
word alphabet_stack_pos; // Position dans la pile de décodage d'un chaîne
T_GIF_LSDB LSDB;
T_GIF_IDB IDB;
T_GIF_GCE GCE;
word nb_colors; // Nombre de couleurs dans l'image
word color_index; // index de traitement d'une couleur
byte size_to_read; // Nombre de données à lire (divers)
byte block_identifier; // Code indicateur du type de bloc en cours
byte initial_nb_bits; // Nb de bits au début du traitement LZW
word special_case=0; // Mémoire pour le cas spécial
word old_code=0; // Code précédent
word byte_read; // Sauvegarde du code en cours de lecture
word value_clr; // Valeur <=> Clear tables
word value_eof; // Valeur <=> End d'image
long file_size;
int number_LID; // Nombre d'images trouvées dans le fichier
int current_layer = 0;
int last_delay = 0;
byte is_transparent = 0;
byte is_looping=0;
enum PIXEL_RATIO ratio;
byte disposal_method = DISPOSAL_METHOD_RESTORE_BGCOLOR;
byte previous_disposal_method = DISPOSAL_METHOD_RESTORE_BGCOLOR;
word previous_width=0;
word previous_height=0;
word previous_pos_x=0;
word previous_pos_y=0;
/////////////////////////////////////////////////// FIN DES DECLARATIONS //
number_LID=0;
Get_full_filename(filename, context->File_name, context->File_directory);
if ((GIF_file=fopen(filename, "rb")))
{
file_size=File_length_file(GIF_file);
if ( (Read_bytes(GIF_file,signature,6)) &&
( (memcmp(signature,"GIF87a",6)==0) ||
(memcmp(signature,"GIF89a",6)==0) ) )
{
// Allocation de mémoire pour les tables & piles de traitement:
alphabet_stack =(word *)malloc(4096*sizeof(word));
alphabet_prefix=(word *)malloc(4096*sizeof(word));
alphabet_suffix=(word *)malloc(4096*sizeof(word));
if (Read_word_le(GIF_file,&(LSDB.Width))
&& Read_word_le(GIF_file,&(LSDB.Height))
&& Read_byte(GIF_file,&(LSDB.Resol))
&& Read_byte(GIF_file,&(LSDB.Backcol))
&& Read_byte(GIF_file,&(LSDB.Aspect))
)
{
// Lecture du Logical Screen Descriptor Block réussie:
Original_screen_X=LSDB.Width;
Original_screen_Y=LSDB.Height;
if (LSDB.Aspect==17)
ratio=PIXEL_TALL;
else if (LSDB.Aspect==113)
ratio=PIXEL_WIDE;
else
ratio=PIXEL_SIMPLE;
Pre_load(context, LSDB.Width,LSDB.Height,file_size,FORMAT_GIF,ratio,0);
context->Width=LSDB.Width;
context->Height=LSDB.Height;
// Palette globale dispo = (LSDB.Resol and $80)
// Profondeur de couleur =((LSDB.Resol and $70) shr 4)+1
// Nombre de bits/pixel = (LSDB.Resol and $07)+1
// Ordre de Classement = (LSDB.Aspect and $80)
nb_colors=(1 << ((LSDB.Resol & 0x07)+1));
if (LSDB.Resol & 0x80)
{
// Palette globale dispo:
if (Config.Clear_palette)
memset(context->Palette,0,sizeof(T_Palette));
// Load the palette
for(color_index=0;color_indexPalette[color_index].R));
Read_byte(GIF_file,&(context->Palette[color_index].G));
Read_byte(GIF_file,&(context->Palette[color_index].B));
}
}
// On lit un indicateur de block
Read_byte(GIF_file,&block_identifier);
while (block_identifier!=0x3B && !File_error)
{
switch (block_identifier)
{
case 0x21: // Bloc d'extension
{
byte function_code;
// Lecture du code de fonction:
Read_byte(GIF_file,&function_code);
// Lecture de la taille du bloc:
Read_byte(GIF_file,&size_to_read);
while (size_to_read!=0 && !File_error)
{
switch(function_code)
{
case 0xFE: // Comment Block Extension
// On récupère le premier commentaire non-vide,
// on jette les autres.
if (context->Comment[0]=='\0')
{
int nb_char_to_keep=Min(size_to_read,COMMENT_SIZE);
Read_bytes(GIF_file,context->Comment,nb_char_to_keep);
context->Comment[nb_char_to_keep+1]='\0';
// Si le commentaire etait trop long, on fait avance-rapide
// sur la suite.
if (size_to_read>nb_char_to_keep)
fseek(GIF_file,size_to_read-nb_char_to_keep,SEEK_CUR);
}
// Lecture de la taille du bloc suivant:
Read_byte(GIF_file,&size_to_read);
break;
case 0xF9: // Graphics Control Extension
// Prévu pour la transparence
if ( Read_byte(GIF_file,&(GCE.Packed_fields))
&& Read_word_le(GIF_file,&(GCE.Delay_time))
&& Read_byte(GIF_file,&(GCE.Transparent_color)))
{
previous_disposal_method = disposal_method;
disposal_method = (GCE.Packed_fields >> 2) & 7;
last_delay = GCE.Delay_time;
context->Transparent_color= GCE.Transparent_color;
is_transparent = GCE.Packed_fields & 1;
if (number_LID == 0)
context->Background_transparent = is_transparent;
is_transparent &= is_looping;
}
else
File_error=2;
// Lecture de la taille du bloc suivant:
Read_byte(GIF_file,&size_to_read);
break;
case 0xFF: // Application Extension
// Normally, always a 11-byte block
if (size_to_read == 0x0B)
{
char aeb[0x0B];
Read_bytes(GIF_file,aeb, 0x0B);
if (File_error)
;
else if (!memcmp(aeb,"NETSCAPE2.0",0x0B))
{
is_looping=1;
// The well-known Netscape extension.
// Load as an animation
if (context->Type == CONTEXT_MAIN_IMAGE)
{
Main_backups->Pages->Image_mode = IMAGE_MODE_ANIMATION;
Update_screen_targets();
}
// Skip sub-block
do
{
if (! Read_byte(GIF_file,&size_to_read))
File_error=1;
fseek(GIF_file,size_to_read,SEEK_CUR);
} while (!File_error && size_to_read!=0);
}
else if (!memcmp(aeb,"GFX2PATH\x00\x00\x00",0x0B))
{
// Original file path
if (context->Original_file_name && context->Original_file_directory)
{
Read_byte(GIF_file,&size_to_read);
if (!File_error && size_to_read)
{
Read_bytes(GIF_file,context->Original_file_directory, size_to_read);
Read_byte(GIF_file,&size_to_read);
if (!File_error && size_to_read)
{
Read_bytes(GIF_file,context->Original_file_name, size_to_read);
Read_byte(GIF_file,&size_to_read); // Normally 0
}
}
}
else
{
// Nothing to do, just skip sub-block
Read_byte(GIF_file,&size_to_read);
while (size_to_read!=0 && !File_error)
{
fseek(GIF_file,size_to_read,SEEK_CUR);
Read_byte(GIF_file,&size_to_read);
}
}
}
else if (!memcmp(aeb,"CRNG\0\0\0\0" "1.0",0x0B))
{
// Color animation. Similar to a CRNG chunk in IFF file format.
word rate;
word flags;
byte min_col;
byte max_col;
//
Read_byte(GIF_file,&size_to_read);
for(;size_to_read>0 && !File_error;size_to_read-=6)
{
if ( (Read_word_be(GIF_file,&rate))
&& (Read_word_be(GIF_file,&flags))
&& (Read_byte(GIF_file,&min_col))
&& (Read_byte(GIF_file,&max_col)))
{
if (min_col != max_col)
{
// Valid cycling range
if (max_colCycle_range[context->Color_cycles].Start=min_col;
context->Cycle_range[context->Color_cycles].End=max_col;
context->Cycle_range[context->Color_cycles].Inverse=(flags&2)?1:0;
context->Cycle_range[context->Color_cycles].Speed=(flags&1)?rate/78:0;
context->Color_cycles++;
}
}
else
{
File_error=1;
}
}
// Read end-of-block delimiter
if (!File_error)
Read_byte(GIF_file,&size_to_read);
if (size_to_read!=0)
File_error=1;
}
else
{
// Unknown extension, skip.
Read_byte(GIF_file,&size_to_read);
while (size_to_read!=0 && !File_error)
{
fseek(GIF_file,size_to_read,SEEK_CUR);
Read_byte(GIF_file,&size_to_read);
}
}
}
else
{
fseek(GIF_file,size_to_read,SEEK_CUR);
// Lecture de la taille du bloc suivant:
Read_byte(GIF_file,&size_to_read);
}
break;
default:
// On saute le bloc:
fseek(GIF_file,size_to_read,SEEK_CUR);
// Lecture de la taille du bloc suivant:
Read_byte(GIF_file,&size_to_read);
break;
}
}
}
break;
case 0x2C: // Local Image Descriptor
{
if (number_LID!=0)
{
// This a second layer/frame, or more.
// Attempt to add a layer to current image
current_layer++;
Set_loading_layer(context, current_layer);
if (context->Type == CONTEXT_MAIN_IMAGE && Main_backups->Pages->Image_mode == IMAGE_MODE_ANIMATION)
{
// Copy the content of previous layer.
memcpy(
Main_backups->Pages->Image[Main_current_layer].Pixels,
Main_backups->Pages->Image[Main_current_layer-1].Pixels,
Main_backups->Pages->Width*Main_backups->Pages->Height);
}
else
{
Fill_canvas(context, is_transparent ? context->Transparent_color : LSDB.Backcol);
}
}
else
{
// First frame/layer, fill canvas with backcolor
Fill_canvas(context, is_transparent ? context->Transparent_color : LSDB.Backcol);
}
// Duration was set in the previously loaded GCE
Set_frame_duration(context, last_delay*10);
number_LID++;
// lecture de 10 derniers octets
if ( Read_word_le(GIF_file,&(IDB.Pos_X))
&& Read_word_le(GIF_file,&(IDB.Pos_Y))
&& Read_word_le(GIF_file,&(IDB.Image_width))
&& Read_word_le(GIF_file,&(IDB.Image_height))
&& Read_byte(GIF_file,&(IDB.Indicator))
&& IDB.Image_width && IDB.Image_height)
{
// Palette locale dispo = (IDB.Indicator and $80)
// Image entrelacée = (IDB.Indicator and $40)
// Ordre de classement = (IDB.Indicator and $20)
// Nombre de bits/pixel = (IDB.Indicator and $07)+1 (si palette locale dispo)
if (IDB.Indicator & 0x80)
{
// Palette locale dispo
if (Config.Clear_palette)
memset(context->Palette,0,sizeof(T_Palette));
nb_colors=(1 << ((IDB.Indicator & 0x07)+1));
// Load the palette
for(color_index=0;color_indexPalette[color_index].R));
Read_byte(GIF_file,&(context->Palette[color_index].G));
Read_byte(GIF_file,&(context->Palette[color_index].B));
}
}
if (number_LID!=1)
{
// This a second layer/frame, or more.
if (context->Type == CONTEXT_MAIN_IMAGE && Main_backups->Pages->Image_mode == IMAGE_MODE_ANIMATION)
{
// Need to clear previous image to back-color.
if (previous_disposal_method==DISPOSAL_METHOD_RESTORE_BGCOLOR)
{
int y;
for (y=0; yPages->Image[Main_current_layer].Pixels
+ (previous_pos_y+y)* Main_backups->Pages->Width+previous_pos_x,
is_transparent ? context->Transparent_color : LSDB.Backcol,
previous_width);
}
}
}
previous_height=IDB.Image_height;
previous_width=IDB.Image_width;
previous_pos_x=IDB.Pos_X;
previous_pos_y=IDB.Pos_Y;
File_error=0;
if (!Read_byte(GIF_file,&(initial_nb_bits)))
File_error=1;
value_clr =(1<value_clr)
{
alphabet_stack[alphabet_stack_pos++]=alphabet_suffix[GIF_current_code];
GIF_current_code=alphabet_prefix[GIF_current_code];
}
special_case=alphabet_stack[alphabet_stack_pos++]=GIF_current_code;
do
GIF_new_pixel(context, &IDB, is_transparent, alphabet_stack[--alphabet_stack_pos]);
while (alphabet_stack_pos!=0);
alphabet_prefix[alphabet_free ]=old_code;
alphabet_suffix[alphabet_free++]=GIF_current_code;
old_code=byte_read;
if (alphabet_free>alphabet_max)
{
if (GIF_nb_bits<12)
alphabet_max =((1 << (++GIF_nb_bits))-1);
}
}
else // Code Clear rencontré
{
GIF_nb_bits =initial_nb_bits + 1;
alphabet_max =((1 << GIF_nb_bits)-1);
alphabet_free =(1<=0)
if ( /* (GIF_pos_X!=0) || */
( ( (!GIF_interlaced) && (GIF_pos_Y!=IDB.Image_height) && (GIF_pos_X!=0)) ||
( (GIF_interlaced) && (!GIF_finished_interlaced_image) )
) )
File_error=2;
// No need to read more than one frame in animation preview mode
if (context->Type == CONTEXT_PREVIEW && is_looping)
{
goto early_exit;
}
// Same with brush
if (context->Type == CONTEXT_BRUSH && is_looping)
{
goto early_exit;
}
} // Le fichier contenait un IDB
else
File_error=2;
}
default:
break;
}
// Lecture du code de fonction suivant:
if (!Read_byte(GIF_file,&block_identifier))
File_error=2;
}
} // Le fichier contenait un LSDB
else
File_error=1;
early_exit:
// Libération de la mémoire utilisée par les tables & piles de traitement:
free(alphabet_suffix);
free(alphabet_prefix);
free(alphabet_stack);
alphabet_suffix = alphabet_prefix = alphabet_stack = NULL;
} // Le fichier contenait au moins la signature GIF87a ou GIF89a
else
File_error=1;
fclose(GIF_file);
} // Le fichier était ouvrable
else
File_error=1;
}
// -- Sauver un fichier au format GIF ---------------------------------------
int GIF_stop; // "On peut arrêter la sauvegarde du fichier"
byte GIF_buffer[256]; // buffer d'écriture de bloc de données compilées
// -- Vider le buffer GIF dans le buffer KM --
void GIF_empty_buffer(void)
{
word index;
if (GIF_remainder_byte)
{
GIF_buffer[0]=GIF_remainder_byte;
for (index=0;index<=GIF_remainder_byte;index++)
Write_one_byte(GIF_file,GIF_buffer[index]);
GIF_remainder_byte=0;
}
}
// -- Ecrit un code à GIF_nb_bits --
void GIF_set_code(word Code)
{
word nb_bits_to_process=GIF_nb_bits;
word nb_bits_processed =0;
word current_nb_bits;
while (nb_bits_to_process)
{
current_nb_bits=(nb_bits_to_process<=(8-GIF_remainder_bits))?nb_bits_to_process:(8-GIF_remainder_bits);
GIF_last_byte|=(Code & ((1<>=current_nb_bits;
GIF_remainder_bits +=current_nb_bits;
nb_bits_processed +=current_nb_bits;
nb_bits_to_process-=current_nb_bits;
if (GIF_remainder_bits==8) // Il ne reste plus de bits à coder sur l'octet courant
{
// Ecrire l'octet à balancer:
GIF_buffer[++GIF_remainder_byte]=GIF_last_byte;
// Si on a atteint la fin du bloc de Raster Data
if (GIF_remainder_byte==255)
// On doit vider le buffer qui est maintenant plein
GIF_empty_buffer();
GIF_last_byte=0;
GIF_remainder_bits=0;
}
}
}
// -- Lire le pixel suivant --
byte GIF_next_pixel(T_IO_Context *context, T_GIF_IDB *idb)
{
byte temp;
temp=Get_pixel(context, GIF_pos_X,GIF_pos_Y);
if (++GIF_pos_X>=idb->Image_width)
{
GIF_pos_X=0;
if (++GIF_pos_Y>=idb->Image_height)
GIF_stop=1;
}
return temp;
}
void Save_GIF(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
word * alphabet_prefix; // Table des préfixes des codes
word * alphabet_suffix; // Table des suffixes des codes
word * alphabet_daughter; // Table des chaînes filles (plus longues)
word * alphabet_sister; // Table des chaînes soeurs (même longueur)
word alphabet_free; // Position libre dans l'alphabet
word alphabet_max; // Nombre d'entrées possibles dans l'alphabet
word start; // Code précédent (sert au linkage des chaînes)
int descend; // Booléen "On vient de descendre"
T_GIF_LSDB LSDB;
T_GIF_IDB IDB;
byte block_identifier; // Code indicateur du type de bloc en cours
word current_string; // Code de la chaîne en cours de traitement
byte current_char; // Caractère à coder
word index; // index de recherche de chaîne
int current_layer;
/////////////////////////////////////////////////// FIN DES DECLARATIONS //
File_error=0;
Get_full_filename(filename, context->File_name, context->File_directory);
if ((GIF_file=fopen(filename,"wb")))
{
setvbuf(GIF_file, NULL, _IOFBF, 64*1024);
// On écrit la signature du fichier
if (Write_bytes(GIF_file,"GIF89a",6))
{
// La signature du fichier a été correctement écrite.
// Allocation de mémoire pour les tables
alphabet_prefix=(word *)malloc(4096*sizeof(word));
alphabet_suffix=(word *)malloc(4096*sizeof(word));
alphabet_daughter =(word *)malloc(4096*sizeof(word));
alphabet_sister =(word *)malloc(4096*sizeof(word));
// On initialise le LSDB du fichier
if (Config.Screen_size_in_GIF)
{
LSDB.Width=Screen_width;
LSDB.Height=Screen_height;
}
else
{
LSDB.Width=context->Width;
LSDB.Height=context->Height;
}
LSDB.Resol =0x97; // Image en 256 couleurs, avec une palette
LSDB.Backcol=context->Transparent_color;
switch(context->Ratio)
{
case PIXEL_TALL:
LSDB.Aspect = 17; // 1:2
break;
case PIXEL_WIDE:
LSDB.Aspect = 113; // 2:1
break;
default:
LSDB.Aspect = 0; // undefined, which is most frequent.
// 49 would be 1:1 ratio
}
// On sauve le LSDB dans le fichier
if (Write_word_le(GIF_file,LSDB.Width) &&
Write_word_le(GIF_file,LSDB.Height) &&
Write_byte(GIF_file,LSDB.Resol) &&
Write_byte(GIF_file,LSDB.Backcol) &&
Write_byte(GIF_file,LSDB.Aspect) )
{
// Le LSDB a été correctement écrit.
int i;
// On sauve la palette
for(i=0;i<256 && !File_error;i++)
{
if (!Write_byte(GIF_file,context->Palette[i].R)
||!Write_byte(GIF_file,context->Palette[i].G)
||!Write_byte(GIF_file,context->Palette[i].B))
File_error=1;
}
if (!File_error)
{
// La palette a été correctement écrite.
// Ecriture de la transparence
//Write_bytes(GIF_file,"\x21\xF9\x04\x01\x00\x00\xNN\x00",8);
// "Netscape" animation extension
// Write_bytes(GIF_file,"\x21\xFF\x0BNETSCAPE2.0\x03\xLL\xSS\xSS\x00",19);
// LL : 01 to loop
// SSSS : number of loops
if (context->Type == CONTEXT_MAIN_IMAGE && Main_backups->Pages->Image_mode == IMAGE_MODE_ANIMATION)
if (context->Nb_layers>1)
Write_bytes(GIF_file,"\x21\xFF\x0BNETSCAPE2.0\x03\x01\x00\x00\x00",19);
// Ecriture du commentaire
if (context->Comment[0])
{
Write_bytes(GIF_file,"\x21\xFE",2);
Write_byte(GIF_file,strlen(context->Comment));
Write_bytes(GIF_file,context->Comment,strlen(context->Comment)+1);
}
// Write cycling colors
if (context->Color_cycles)
{
int i;
Write_bytes(GIF_file,"\x21\xff\x0B" "CRNG\0\0\0\0" "1.0",14);
Write_byte(GIF_file,context->Color_cycles*6);
for (i=0; iColor_cycles; i++)
{
word flags=0;
flags|= context->Cycle_range[i].Speed?1:0; // Cycling or not
flags|= context->Cycle_range[i].Inverse?2:0; // Inverted
Write_word_be(GIF_file,context->Cycle_range[i].Speed*78); // Rate
Write_word_be(GIF_file,flags); // Flags
Write_byte(GIF_file,context->Cycle_range[i].Start); // Min color
Write_byte(GIF_file,context->Cycle_range[i].End); // Max color
}
Write_byte(GIF_file,0);
}
// Loop on all layers
for (current_layer=0;
current_layer < context->Nb_layers && !File_error;
current_layer++)
{
// Write a Graphic Control Extension
T_GIF_GCE GCE;
Set_saving_layer(context, current_layer);
GCE.Block_identifier = 0x21;
GCE.Function = 0xF9;
GCE.Block_size=4;
if (context->Type == CONTEXT_MAIN_IMAGE && Main_backups->Pages->Image_mode == IMAGE_MODE_ANIMATION)
{
// Animation frame
int duration;
GCE.Packed_fields=(2<<2)|(context->Background_transparent);
duration=Get_frame_duration(context)/10;
GCE.Delay_time=duration<0xFFFF?duration:0xFFFF;
}
else
{
// Layered image
if (current_layer==0)
GCE.Packed_fields=(1<<2)|(context->Background_transparent);
else
GCE.Packed_fields=(1<<2)|(1);
GCE.Delay_time=5; // Duration 5/100s (minimum viable value for current web browsers)
if (current_layer == context->Nb_layers -1)
GCE.Delay_time=0xFFFF; // Infinity (10 minutes)
}
GCE.Transparent_color=context->Transparent_color;
GCE.Block_terminator=0x00;
if (Write_byte(GIF_file,GCE.Block_identifier)
&& Write_byte(GIF_file,GCE.Function)
&& Write_byte(GIF_file,GCE.Block_size)
&& Write_byte(GIF_file,GCE.Packed_fields)
&& Write_word_le(GIF_file,GCE.Delay_time)
&& Write_byte(GIF_file,GCE.Transparent_color)
&& Write_byte(GIF_file,GCE.Block_terminator)
)
{
// On va écrire un block indicateur d'IDB et l'IDB du fichier
block_identifier=0x2C;
IDB.Pos_X=0;
IDB.Pos_Y=0;
IDB.Image_width=context->Width;
IDB.Image_height=context->Height;
IDB.Indicator=0x07; // Image non entrelacée, pas de palette locale.
IDB.Nb_bits_pixel=8; // Image 256 couleurs;
if ( Write_byte(GIF_file,block_identifier) &&
Write_word_le(GIF_file,IDB.Pos_X) &&
Write_word_le(GIF_file,IDB.Pos_Y) &&
Write_word_le(GIF_file,IDB.Image_width) &&
Write_word_le(GIF_file,IDB.Image_height) &&
Write_byte(GIF_file,IDB.Indicator) &&
Write_byte(GIF_file,IDB.Nb_bits_pixel))
{
// Le block indicateur d'IDB et l'IDB ont étés correctements
// écrits.
GIF_pos_X=0;
GIF_pos_Y=0;
GIF_last_byte=0;
GIF_remainder_bits=0;
GIF_remainder_byte=0;
index=4096;
File_error=0;
GIF_stop=0;
// Réintialisation de la table:
alphabet_free=258;
GIF_nb_bits =9;
alphabet_max =511;
GIF_set_code(256);
for (start=0;start<4096;start++)
{
alphabet_daughter[start]=4096;
alphabet_sister[start]=4096;
}
////////////////////////////////////////////// COMPRESSION LZW //
start=current_string=GIF_next_pixel(context, &IDB);
descend=1;
do
{
current_char=GIF_next_pixel(context, &IDB);
// On regarde si dans la table on aurait pas une chaîne
// équivalente à current_string+Caractere
while ( (index0xFFF)
{
// Réintialisation de la table:
GIF_set_code(256);
alphabet_free=258;
GIF_nb_bits =9;
alphabet_max =511;
for (start=0;start<4096;start++)
{
alphabet_daughter[start]=4096;
alphabet_sister[start]=4096;
}
}
else if (alphabet_free>alphabet_max+1)
{
// On augmente le nb de bits
GIF_nb_bits++;
alphabet_max=(1<
//
// 00
if (context->Original_file_name != NULL
&& context->Original_file_directory != NULL)
{
long name_size = 1+strlen(context->Original_file_name);
long dir_size = 1+strlen(context->Original_file_directory);
if (name_size<256 && dir_size<256)
{
if (! Write_bytes(GIF_file,"\x21\xFF\x0BGFX2PATH\x00\x00\x00", 14)
|| ! Write_byte(GIF_file,dir_size)
|| ! Write_bytes(GIF_file, context->Original_file_directory, dir_size)
|| ! Write_byte(GIF_file,name_size)
|| ! Write_bytes(GIF_file, context->Original_file_name, name_size)
|| ! Write_byte(GIF_file,0))
File_error=1;
}
}
// On écrit un GIF TERMINATOR, exigé par SVGA et SEA.
if (! Write_byte(GIF_file,'\x3B'))
File_error=1;
}
} // On a pu écrire la palette
else
File_error=1;
} // On a pu écrire le LSDB
else
File_error=1;
// Libération de la mémoire utilisée par les tables
free(alphabet_sister);
free(alphabet_daughter);
free(alphabet_suffix);
free(alphabet_prefix);
} // On a pu écrire la signature du fichier
else
File_error=1;
fclose(GIF_file);
if (File_error)
remove(filename);
} // On a pu ouvrir le fichier en écriture
else
File_error=1;
}
//////////////////////////////////// PCX ////////////////////////////////////
typedef struct
{
byte Manufacturer; // |_ Il font chier ces cons! Ils auraient pu
byte Version; // | mettre une vraie signature!
byte Compression; // L'image est-elle compressée?
byte Depth; // Nombre de bits pour coder un pixel (inutile puisqu'on se sert de Plane)
word X_min; // |_ Coin haut-gauche |
word Y_min; // | de l'image |_ (Crétin!)
word X_max; // |_ Coin bas-droit |
word Y_max; // | de l'image |
word X_dpi; // |_ Densité de |_ (Presque inutile parce que
word Y_dpi; // | l'image | aucun moniteur n'est pareil!)
byte Palette_16c[48]; // Palette 16 coul (inutile pour 256c) (débile!)
byte Reserved; // Ca me plait ça aussi!
byte Plane; // 4 => 16c , 1 => 256c , ...
word Bytes_per_plane_line;// Doit toujours être pair
word Palette_info; // 1 => color , 2 => Gris (ignoré à partir de la version 4)
word Screen_X; // |_ Dimensions de
word Screen_Y; // | l'écran d'origine
byte Filler[54]; // Ca... J'adore!
} T_PCX_Header;
T_PCX_Header PCX_header;
// -- Tester si un fichier est au format PCX --------------------------------
void Test_PCX(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
File_error=0;
Get_full_filename(filename, context->File_name, context->File_directory);
if ((file=fopen(filename, "rb")))
{
if (Read_byte(file,&(PCX_header.Manufacturer)) &&
Read_byte(file,&(PCX_header.Version)) &&
Read_byte(file,&(PCX_header.Compression)) &&
Read_byte(file,&(PCX_header.Depth)) &&
Read_word_le(file,&(PCX_header.X_min)) &&
Read_word_le(file,&(PCX_header.Y_min)) &&
Read_word_le(file,&(PCX_header.X_max)) &&
Read_word_le(file,&(PCX_header.Y_max)) &&
Read_word_le(file,&(PCX_header.X_dpi)) &&
Read_word_le(file,&(PCX_header.Y_dpi)) &&
Read_bytes(file,&(PCX_header.Palette_16c),48) &&
Read_byte(file,&(PCX_header.Reserved)) &&
Read_byte(file,&(PCX_header.Plane)) &&
Read_word_le(file,&(PCX_header.Bytes_per_plane_line)) &&
Read_word_le(file,&(PCX_header.Palette_info)) &&
Read_word_le(file,&(PCX_header.Screen_X)) &&
Read_word_le(file,&(PCX_header.Screen_Y)) &&
Read_bytes(file,&(PCX_header.Filler),54) )
{
// Vu que ce header a une signature de merde et peu significative, il
// va falloir que je teste différentes petites valeurs dont je connais
// l'intervalle. Grrr!
if ( (PCX_header.Manufacturer!=10)
|| (PCX_header.Compression>1)
|| ( (PCX_header.Depth!=1) && (PCX_header.Depth!=2) && (PCX_header.Depth!=4) && (PCX_header.Depth!=8) )
|| ( (PCX_header.Plane!=1) && (PCX_header.Plane!=2) && (PCX_header.Plane!=4) && (PCX_header.Plane!=8) && (PCX_header.Plane!=3) )
|| (PCX_header.X_maxWidth; x_pos++)
{
color=(IFF_buffer[x_pos/reduction]>>((reduction_minus_one-(x_pos%reduction))*depth)) & byte_mask;
Set_pixel(context, x_pos,y_pos,color);
}
}
void Load_PCX(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
short line_size;
short real_line_size; // width de l'image corrigée
short width_read;
short x_pos;
short y_pos;
byte byte1;
byte byte2;
byte index;
dword nb_colors;
long file_size;
byte palette_CGA[9]={ 84,252,252, 252, 84,252, 252,252,252};
long position;
long image_size;
byte * buffer;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename, "rb")))
{
file_size=File_length_file(file);
if (Read_byte(file,&(PCX_header.Manufacturer)) &&
Read_byte(file,&(PCX_header.Version)) &&
Read_byte(file,&(PCX_header.Compression)) &&
Read_byte(file,&(PCX_header.Depth)) &&
Read_word_le(file,&(PCX_header.X_min)) &&
Read_word_le(file,&(PCX_header.Y_min)) &&
Read_word_le(file,&(PCX_header.X_max)) &&
Read_word_le(file,&(PCX_header.Y_max)) &&
Read_word_le(file,&(PCX_header.X_dpi)) &&
Read_word_le(file,&(PCX_header.Y_dpi)) &&
Read_bytes(file,&(PCX_header.Palette_16c),48) &&
Read_byte(file,&(PCX_header.Reserved)) &&
Read_byte(file,&(PCX_header.Plane)) &&
Read_word_le(file,&(PCX_header.Bytes_per_plane_line)) &&
Read_word_le(file,&(PCX_header.Palette_info)) &&
Read_word_le(file,&(PCX_header.Screen_X)) &&
Read_word_le(file,&(PCX_header.Screen_Y)) &&
Read_bytes(file,&(PCX_header.Filler),54) )
{
context->Width=PCX_header.X_max-PCX_header.X_min+1;
context->Height=PCX_header.Y_max-PCX_header.Y_min+1;
Original_screen_X=PCX_header.Screen_X;
Original_screen_Y=PCX_header.Screen_Y;
if (PCX_header.Plane!=3)
{
Pre_load(context, context->Width,context->Height,file_size,FORMAT_PCX,PIXEL_SIMPLE,0);
if (File_error==0)
{
// On prépare la palette à accueillir les valeurs du fichier PCX
if (Config.Clear_palette)
memset(context->Palette,0,sizeof(T_Palette));
nb_colors=(dword)(1<4)
memcpy(context->Palette,PCX_header.Palette_16c,48);
else
{
context->Palette[1].R=0;
context->Palette[1].G=0;
context->Palette[1].B=0;
byte1=PCX_header.Palette_16c[3]>>5;
if (nb_colors==4)
{ // Pal. CGA "alakon" (du Turc Allahkoum qui signifie "à la con" :))
memcpy(context->Palette+1,palette_CGA,9);
if (!(byte1&2))
{
context->Palette[1].B=84;
context->Palette[2].B=84;
context->Palette[3].B=84;
}
} // Palette monochrome (on va dire que c'est du N&B)
else
{
context->Palette[1].R=252;
context->Palette[1].G=252;
context->Palette[1].B=252;
}
}
// On se positionne à la fin du fichier - 769 octets pour voir s'il y
// a une palette.
if ( (PCX_header.Depth==8) && (PCX_header.Version>=5) && (file_size>(256*3)) )
{
fseek(file,file_size-((256*3)+1),SEEK_SET);
// On regarde s'il y a une palette après les données de l'image
if (Read_byte(file,&byte1))
if (byte1==12) // Lire la palette si c'est une image en 256 couleurs
{
int index;
// On lit la palette 256c que ces crétins ont foutue à la fin du fichier
for(index=0;index<256;index++)
if ( ! Read_byte(file,&(context->Palette[index].R))
|| ! Read_byte(file,&(context->Palette[index].G))
|| ! Read_byte(file,&(context->Palette[index].B)) )
{
File_error=2;
DEBUG("ERROR READING PCX PALETTE !",index);
break;
}
}
}
// Maintenant qu'on a lu la palette que ces crétins sont allés foutre
// à la fin, on retourne juste après le header pour lire l'image.
fseek(file,128,SEEK_SET);
if (!File_error)
{
line_size=PCX_header.Bytes_per_plane_line*PCX_header.Plane;
real_line_size=(short)PCX_header.Bytes_per_plane_line<<3;
// On se sert de données ILBM car le dessin de ligne en moins de 256
// couleurs se fait comme avec la structure ILBM.
Image_HAM=0;
IFF_buffer=(byte *)malloc(line_size);
// Chargement de l'image
if (PCX_header.Compression) // Image compressée
{
/*Init_lecture();*/
image_size=(long)PCX_header.Bytes_per_plane_line*context->Height;
if (PCX_header.Depth==8) // 256 couleurs (1 plan)
{
for (position=0; ((positionHeight) && (!File_error)); y_pos++)
{
for (x_pos=0; ((x_posHeight) && (!File_error);y_pos++)
{
if ((width_read=Read_bytes(file,IFF_buffer,line_size)))
{
if (PCX_header.Plane==1)
for (x_pos=0; x_posWidth;x_pos++)
Set_pixel(context, x_pos,y_pos,IFF_buffer[x_pos]);
else
{
if (PCX_header.Depth==1)
Draw_IFF_line(context, y_pos,real_line_size,PCX_header.Plane);
else
Draw_PCX_line(context, y_pos,PCX_header.Depth);
}
}
else
File_error=2;
}
}
free(IFF_buffer);
IFF_buffer = NULL;
}
}
}
else
{
// Image 24 bits!!!
Pre_load(context,context->Width,context->Height,file_size,FORMAT_PCX,PIXEL_SIMPLE,1);
if (File_error==0)
{
line_size=PCX_header.Bytes_per_plane_line*3;
buffer=(byte *)malloc(line_size);
if (!PCX_header.Compression)
{
for (y_pos=0;(y_posHeight) && (!File_error);y_pos++)
{
if (Read_bytes(file,buffer,line_size))
{
for (x_pos=0; x_posWidth; x_pos++)
Set_pixel_24b(context, x_pos,y_pos,buffer[x_pos+(PCX_header.Bytes_per_plane_line*0)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*1)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*2)]);
}
else
File_error=2;
}
}
else
{
/*Init_lecture();*/
for (y_pos=0,position=0;(y_posHeight) && (!File_error);)
{
// Lecture et décompression de la ligne
if(Read_byte(file,&byte1)!=1) File_error=2;
if (!File_error)
{
if ((byte1 & 0xC0)==0xC0)
{
byte1-=0xC0; // facteur de répétition
if(Read_byte(file,&byte2)!=1) File_error=2; // octet à répéter
if (!File_error)
{
for (index=0; (index=line_size)
{
for (x_pos=0; x_posWidth; x_pos++)
Set_pixel_24b(context, x_pos,y_pos,buffer[x_pos+(PCX_header.Bytes_per_plane_line*0)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*1)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*2)]);
y_pos++;
position=0;
}
}
}
}
else
{
buffer[position++]=byte1;
if (position>=line_size)
{
for (x_pos=0; x_posWidth; x_pos++)
Set_pixel_24b(context, x_pos,y_pos,buffer[x_pos+(PCX_header.Bytes_per_plane_line*0)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*1)],buffer[x_pos+(PCX_header.Bytes_per_plane_line*2)]);
y_pos++;
position=0;
}
}
}
}
if (position!=0)
File_error=2;
/*Close_lecture();*/
}
free(buffer);
buffer = NULL;
}
}
}
else
{
File_error=1;
}
fclose(file);
}
else
File_error=1;
}
// -- Ecrire un fichier au format PCX ---------------------------------------
void Save_PCX(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
short line_size;
short x_pos;
short y_pos;
byte counter;
byte last_pixel;
byte pixel_read;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename,"wb")))
{
setvbuf(file, NULL, _IOFBF, 64*1024);
PCX_header.Manufacturer=10;
PCX_header.Version=5;
PCX_header.Compression=1;
PCX_header.Depth=8;
PCX_header.X_min=0;
PCX_header.Y_min=0;
PCX_header.X_max=context->Width-1;
PCX_header.Y_max=context->Height-1;
PCX_header.X_dpi=0;
PCX_header.Y_dpi=0;
memcpy(PCX_header.Palette_16c,context->Palette,48);
PCX_header.Reserved=0;
PCX_header.Plane=1;
PCX_header.Bytes_per_plane_line=(context->Width&1)?context->Width+1:context->Width;
PCX_header.Palette_info=1;
PCX_header.Screen_X=Screen_width;
PCX_header.Screen_Y=Screen_height;
memset(PCX_header.Filler,0,54);
if (Write_bytes(file,&(PCX_header.Manufacturer),1) &&
Write_bytes(file,&(PCX_header.Version),1) &&
Write_bytes(file,&(PCX_header.Compression),1) &&
Write_bytes(file,&(PCX_header.Depth),1) &&
Write_word_le(file,PCX_header.X_min) &&
Write_word_le(file,PCX_header.Y_min) &&
Write_word_le(file,PCX_header.X_max) &&
Write_word_le(file,PCX_header.Y_max) &&
Write_word_le(file,PCX_header.X_dpi) &&
Write_word_le(file,PCX_header.Y_dpi) &&
Write_bytes(file,&(PCX_header.Palette_16c),48) &&
Write_bytes(file,&(PCX_header.Reserved),1) &&
Write_bytes(file,&(PCX_header.Plane),1) &&
Write_word_le(file,PCX_header.Bytes_per_plane_line) &&
Write_word_le(file,PCX_header.Palette_info) &&
Write_word_le(file,PCX_header.Screen_X) &&
Write_word_le(file,PCX_header.Screen_Y) &&
Write_bytes(file,&(PCX_header.Filler),54) )
{
line_size=PCX_header.Bytes_per_plane_line*PCX_header.Plane;
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
{
pixel_read=Get_pixel(context, 0,y_pos);
// Compression et écriture de la ligne
for (x_pos=0; ((x_pos1) || (last_pixel>=0xC0) )
Write_one_byte(file,counter|0xC0);
Write_one_byte(file,last_pixel);
}
}
// Ecriture de l'octet (12) indiquant que la palette arrive
if (!File_error)
Write_one_byte(file,12);
// Ecriture de la palette
if (!File_error)
{
if (! Write_bytes(file,context->Palette,sizeof(T_Palette)))
File_error=1;
}
}
else
File_error=1;
fclose(file);
if (File_error)
remove(filename);
}
else
File_error=1;
}
//////////////////////////////////// SCx ////////////////////////////////////
typedef struct
{
byte Filler1[4];
word Width;
word Height;
byte Filler2;
byte Planes;
} T_SCx_Header;
// -- Tester si un fichier est au format SCx --------------------------------
void Test_SCx(T_IO_Context * context)
{
FILE *file; // Fichier du fichier
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
//byte Signature[3];
T_SCx_Header SCx_header;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=1;
// Ouverture du fichier
if ((file=fopen(filename, "rb")))
{
// Lecture et vérification de la signature
if (Read_bytes(file,SCx_header.Filler1,4)
&& Read_word_le(file, &(SCx_header.Width))
&& Read_word_le(file, &(SCx_header.Height))
&& Read_byte(file, &(SCx_header.Filler2))
&& Read_byte(file, &(SCx_header.Planes))
)
{
if ( (!memcmp(SCx_header.Filler1,"RIX",3))
&& SCx_header.Width && SCx_header.Height)
File_error=0;
}
// Fermeture du fichier
fclose(file);
}
}
// -- Lire un fichier au format SCx -----------------------------------------
void Load_SCx(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
FILE *file;
word x_pos,y_pos;
long size,real_size;
long file_size;
T_SCx_Header SCx_header;
T_Palette SCx_Palette;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename, "rb")))
{
file_size=File_length_file(file);
if (Read_bytes(file,SCx_header.Filler1,4)
&& Read_word_le(file, &(SCx_header.Width))
&& Read_word_le(file, &(SCx_header.Height))
&& Read_byte(file, &(SCx_header.Filler2))
&& Read_byte(file, &(SCx_header.Planes))
)
{
Pre_load(context, SCx_header.Width,SCx_header.Height,file_size,FORMAT_SCx,PIXEL_SIMPLE,0);
if (File_error==0)
{
if (!SCx_header.Planes)
size=sizeof(T_Palette);
else
size=sizeof(T_Components)*(1<Palette,0,sizeof(T_Palette));
Palette_64_to_256(SCx_Palette);
memcpy(context->Palette,SCx_Palette,size);
context->Width=SCx_header.Width;
context->Height=SCx_header.Height;
if (!SCx_header.Planes)
{ // 256 couleurs (raw)
IFF_buffer=(byte *)malloc(context->Width);
for (y_pos=0;(y_posHeight) && (!File_error);y_pos++)
{
if (Read_bytes(file,IFF_buffer,context->Width))
for (x_pos=0; x_posWidth;x_pos++)
Set_pixel(context, x_pos,y_pos,IFF_buffer[x_pos]);
else
File_error=2;
}
}
else
{ // moins de 256 couleurs (planar)
size=((context->Width+7)>>3)*SCx_header.Planes;
real_size=(size/SCx_header.Planes)<<3;
IFF_buffer=(byte *)malloc(size);
Image_HAM=0;
for (y_pos=0;(y_posHeight) && (!File_error);y_pos++)
{
if (Read_bytes(file,IFF_buffer,size))
Draw_IFF_line(context, y_pos,real_size,SCx_header.Planes);
else
File_error=2;
}
}
free(IFF_buffer);
IFF_buffer = NULL;
}
else
File_error=1;
}
}
else
File_error=1;
fclose(file);
}
else
File_error=1;
}
// -- Sauver un fichier au format SCx ---------------------------------------
void Save_SCx(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
FILE *file;
short x_pos,y_pos;
T_SCx_Header SCx_header;
byte last_char;
last_char=strlen(context->File_name)-1;
if (context->File_name[last_char]=='?')
{
if (context->Width<=320)
context->File_name[last_char]='I';
else
{
if (context->Width<=360)
context->File_name[last_char]='Q';
else
{
if (context->Width<=640)
context->File_name[last_char]='F';
else
{
if (context->Width<=800)
context->File_name[last_char]='N';
else
context->File_name[last_char]='O';
}
}
}
}
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
// Ouverture du fichier
if ((file=fopen(filename,"wb")))
{
T_Palette palette_64;
setvbuf(file, NULL, _IOFBF, 64*1024);
memcpy(palette_64,context->Palette,sizeof(T_Palette));
Palette_256_to_64(palette_64);
memcpy(SCx_header.Filler1,"RIX3",4);
SCx_header.Width=context->Width;
SCx_header.Height=context->Height;
SCx_header.Filler2=0xAF;
SCx_header.Planes=0x00;
if (Write_bytes(file,SCx_header.Filler1,4)
&& Write_word_le(file, SCx_header.Width)
&& Write_word_le(file, SCx_header.Height)
&& Write_byte(file, SCx_header.Filler2)
&& Write_byte(file, SCx_header.Planes)
&& Write_bytes(file,&palette_64,sizeof(T_Palette))
)
{
for (y_pos=0; ((y_posHeight) && (!File_error)); y_pos++)
for (x_pos=0; x_posWidth; x_pos++)
Write_one_byte(file,Get_pixel(context, x_pos,y_pos));
fclose(file);
if (File_error)
remove(filename);
}
else // Error d'écriture (disque plein ou protégé)
{
fclose(file);
remove(filename);
File_error=1;
}
}
else
{
fclose(file);
remove(filename);
File_error=1;
}
}
//////////////////////////////////// XPM ////////////////////////////////////
void Save_XPM(T_IO_Context* context)
{
FILE* file;
char filename[MAX_PATH_CHARACTERS];
int i,j;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error = 0;
file = fopen(filename, "w");
if (file == NULL)
{
File_error = 1;
return;
}
setvbuf(file, NULL, _IOFBF, 64*1024);
fprintf(file, "/* XPM */\nstatic char* pixmap[] = {\n");
fprintf(file, "\"%d %d 256 2\",\n", context->Width, context->Height);
for (i = 0; i < 256; i++)
{
fprintf(file,"\"%2.2X c #%2.2x%2.2x%2.2x\",\n", i, context->Palette[i].R, context->Palette[i].G,
context->Palette[i].B);
}
for (j = 0; j < context->Height; j++)
{
fprintf(file, "\"");
for (i = 0; i < context->Width; i++)
{
fprintf(file, "%2.2X", Get_pixel(context, i, j));
}
fprintf(file,"\"\n");
}
fclose(file);
}
//////////////////////////////////// PNG ////////////////////////////////////
#ifndef __no_pnglib__
// -- Tester si un fichier est au format PNG --------------------------------
void Test_PNG(T_IO_Context * context)
{
FILE *file; // Fichier du fichier
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
byte png_header[8];
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=1;
// Ouverture du fichier
if ((file=fopen(filename, "rb")))
{
// Lecture du header du fichier
if (Read_bytes(file,png_header,8))
{
if ( !png_sig_cmp(png_header, 0, 8))
File_error=0;
}
fclose(file);
}
}
/// Used by a callback in Load_PNG
T_IO_Context * PNG_current_context;
int PNG_read_unknown_chunk(png_structp ptr, png_unknown_chunkp chunk)
{
(void)ptr; // unused
// png_unknown_chunkp members:
// png_byte name[5];
// png_byte *data;
// png_size_t size;
if (!strcmp((const char *)chunk->name, "crNg"))
{
// Color animation. Similar to a CRNG chunk in an IFF file.
unsigned int i;
byte *chunk_ptr = chunk->data;
// Should be a multiple of 6
if (chunk->size % 6)
return (-1);
for(i=0;isize/6 && i<16; i++)
{
word rate;
word flags;
byte min_col;
byte max_col;
// Rate (big-endian word)
rate = *(chunk_ptr++) << 8;
rate |= *(chunk_ptr++);
// Flags (big-endian)
flags = *(chunk_ptr++) << 8;
flags |= *(chunk_ptr++);
// Min color
min_col = *(chunk_ptr++);
// Max color
max_col = *(chunk_ptr++);
// Check validity
if (min_col != max_col)
{
// Valid cycling range
if (max_colCycle_range[i].Start=min_col;
PNG_current_context->Cycle_range[i].End=max_col;
PNG_current_context->Cycle_range[i].Inverse=(flags&2)?1:0;
PNG_current_context->Cycle_range[i].Speed=(flags&1) ? rate/78 : 0;
PNG_current_context->Color_cycles=i+1;
}
}
return (1); // >0 = success
}
return (0); /* did not recognize */
}
png_bytep * Row_pointers;
// -- Lire un fichier au format PNG -----------------------------------------
void Load_PNG(T_IO_Context * context)
{
FILE *file; // Fichier du fichier
char filename[MAX_PATH_CHARACTERS]; // Nom complet du fichier
byte png_header[8];
byte row_pointers_allocated;
png_bytep trans;
int num_trans;
png_color_16p trans_values;
png_structp png_ptr;
png_infop info_ptr;
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
if ((file=fopen(filename, "rb")))
{
// Load header (8 first bytes)
if (Read_bytes(file,png_header,8))
{
// Do we recognize a png file signature ?
if ( !png_sig_cmp(png_header, 0, 8))
{
// Prepare internal PNG loader
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr)
{
// Prepare internal PNG loader
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr)
{
png_byte color_type;
png_byte bit_depth;
png_voidp user_chunk_ptr;
// Setup a return point. If a pnglib loading error occurs
// in this if(), the else will be executed.
if (!setjmp(png_jmpbuf(png_ptr)))
{
png_init_io(png_ptr, file);
// Inform pnglib we already loaded the header.
png_set_sig_bytes(png_ptr, 8);
// Hook the handler for unknown chunks
user_chunk_ptr = png_get_user_chunk_ptr(png_ptr);
png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr, &PNG_read_unknown_chunk);
// This is a horrid way to pass parameters, but we don't get
// much choice. PNG loader can't be reintrant.
PNG_current_context=context;
// Load file information
png_read_info(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr,info_ptr);
bit_depth = png_get_bit_depth(png_ptr,info_ptr);
// If it's any supported file
// (Note: As of writing this, this test covers every possible
// image format of libpng)
if (color_type == PNG_COLOR_TYPE_PALETTE
|| color_type == PNG_COLOR_TYPE_GRAY
|| color_type == PNG_COLOR_TYPE_GRAY_ALPHA
|| color_type == PNG_COLOR_TYPE_RGB
|| color_type == PNG_COLOR_TYPE_RGB_ALPHA
)
{
int num_text;
png_text *text_ptr;
int unit_type;
png_uint_32 res_x;
png_uint_32 res_y;
// Comment (tEXt)
context->Comment[0]='\0'; // Clear the previous comment
if ((num_text=png_get_text(png_ptr, info_ptr, &text_ptr, NULL)))
{
while (num_text--)
{
if (!strcmp(text_ptr[num_text].key,"Title"))
{
int size;
size = Min(text_ptr[num_text].text_length, COMMENT_SIZE);
strncpy(context->Comment, text_ptr[num_text].text, size);
context->Comment[size]='\0';
break; // Skip all others tEXt chunks
}
}
}
// Pixel Ratio (pHYs)
if (png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y, &unit_type))
{
// Ignore unit, and use the X/Y ratio as a hint for
// WIDE or TALL pixels
if (res_x>0 && res_y>0)
{
if (res_y/res_x>1)
{
context->Ratio=PIXEL_WIDE;
}
else if (res_x/res_y>1)
{
context->Ratio=PIXEL_TALL;
}
}
}
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA)
Pre_load(context,png_get_image_width(png_ptr,info_ptr),png_get_image_height(png_ptr,info_ptr),File_length_file(file),FORMAT_PNG,PIXEL_SIMPLE,1);
else
Pre_load(context,png_get_image_width(png_ptr,info_ptr),png_get_image_height(png_ptr,info_ptr),File_length_file(file),FORMAT_PNG,context->Ratio,0);
if (File_error==0)
{
int x,y;
png_colorp palette;
int num_palette;
// 16-bit images
if (bit_depth == 16)
{
// Reduce to 8-bit
png_set_strip_16(png_ptr);
}
else if (bit_depth < 8)
{
// Inform libpng we want one byte per pixel,
// even though the file was less than 8bpp
png_set_packing(png_ptr);
}
// Images with alpha channel
if (color_type & PNG_COLOR_MASK_ALPHA)
{
// Tell libpng to ignore it
png_set_strip_alpha(png_ptr);
}
// Greyscale images :
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
// Map low bpp greyscales to full 8bit (0-255 range)
if (bit_depth < 8)
{
#if (PNG_LIBPNG_VER_MAJOR <= 1) && (PNG_LIBPNG_VER_MINOR < 4)
// Works well with png 1.2.8, but deprecated in 1.4 ...
png_set_gray_1_2_4_to_8(png_ptr);
#else
// ...where this seems to replace it:
png_set_expand_gray_1_2_4_to_8(png_ptr);
#endif
}
// Create greyscale palette
for (x=0;x<256;x++)
{
context->Palette[x].R=x;
context->Palette[x].G=x;
context->Palette[x].B=x;
}
}
else if (color_type == PNG_COLOR_TYPE_PALETTE) // Palette images
{
if (bit_depth < 8)
{
// Clear unused colors
if (Config.Clear_palette)
memset(context->Palette,0,sizeof(T_Palette));
}
// Get a pointer to the PNG palette
png_get_PLTE(png_ptr, info_ptr, &palette,
&num_palette);
// Copy all colors to the context
for (x=0;xPalette[x].R=palette[x].red;
context->Palette[x].G=palette[x].green;
context->Palette[x].B=palette[x].blue;
}
// The palette must not be freed: it is owned by libpng.
palette = NULL;
}
// Transparency (tRNS)
if (png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &trans_values))
{
if (color_type == PNG_COLOR_TYPE_PALETTE && trans!=NULL)
{
int i;
for (i=0; iTransparent_color = i;
context->Background_transparent = 1;
break;
}
}
}
else if ((color_type == PNG_COLOR_TYPE_GRAY
|| color_type == PNG_COLOR_TYPE_RGB) && trans_values!=NULL)
{
// In this case, num_trans is supposed to be "1",
// and trans_values[0] contains the reference color
// (RGB triplet) that counts as transparent.
// Ideally, we should reserve this color in the palette,
// (so it's not merged and averaged with a neighbor one)
// and after creating the optimized palette, find its
// index and mark it transparent.
// Current implementation: ignore.
}
}
context->Width=png_get_image_width(png_ptr,info_ptr);
context->Height=png_get_image_height(png_ptr,info_ptr);
png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
// Allocate row pointers
Row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * context->Height);
row_pointers_allocated = 0;
/* read file */
if (!setjmp(png_jmpbuf(png_ptr)))
{
if (color_type == PNG_COLOR_TYPE_GRAY
|| color_type == PNG_COLOR_TYPE_GRAY_ALPHA
|| color_type == PNG_COLOR_TYPE_PALETTE
)
{
// 8bpp
for (y=0; yHeight; y++)
Row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
row_pointers_allocated = 1;
png_read_image(png_ptr, Row_pointers);
for (y=0; yHeight; y++)
for (x=0; xWidth; x++)
Set_pixel(context, x, y, Row_pointers[y][x]);
}
else
{
switch (context->Type)
{
case CONTEXT_PREVIEW:
// 24bpp
// It's a preview
// Unfortunately we need to allocate loads of memory
for (y=0; yHeight; y++)
Row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
row_pointers_allocated = 1;
png_read_image(png_ptr, Row_pointers);
for (y=0; yHeight; y++)
for (x=0; xWidth; x++)
Set_pixel_24b(context, x, y, Row_pointers[y][x*3],Row_pointers[y][x*3+1],Row_pointers[y][x*3+2]);
break;
case CONTEXT_MAIN_IMAGE:
case CONTEXT_BRUSH:
case CONTEXT_SURFACE:
// It's loading an actual image
// We'll save memory and time by writing directly into
// our pre-allocated 24bit buffer
for (y=0; yHeight; y++)
Row_pointers[y] = (png_byte*) (&(context->Buffer_image_24b[y * context->Width]));
png_read_image(png_ptr, Row_pointers);
break;
}
}
}
else
File_error=2;
/* cleanup heap allocation */
if (row_pointers_allocated)
{
for (y=0; yHeight; y++) {
free(Row_pointers[y]);
Row_pointers[y] = NULL;
}
}
free(Row_pointers);
Row_pointers = NULL;
}
else
File_error=2;
}
else
// Unsupported image type
File_error=1;
}
else
File_error=1;
}
else
File_error=1;
}
}
/*Close_lecture();*/
}
else // Lecture header impossible: Error ne modifiant pas l'image
File_error=1;
fclose(file);
}
else // Ouv. fichier impossible: Error ne modifiant pas l'image
File_error=1;
}
void Save_PNG(T_IO_Context * context)
{
char filename[MAX_PATH_CHARACTERS];
FILE *file;
int y;
byte * pixel_ptr;
png_structp png_ptr;
png_infop info_ptr;
png_unknown_chunk crng_chunk;
byte cycle_data[16*6]; // Storage for color-cycling data, referenced by crng_chunk
Get_full_filename(filename, context->File_name, context->File_directory);
File_error=0;
Row_pointers = NULL;
// Ouverture du fichier
if ((file=fopen(filename,"wb")))
{
setvbuf(file, NULL, _IOFBF, 64*1024);
/* initialisation */
if ((png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL))
&& (info_ptr = png_create_info_struct(png_ptr)))
{
if (!setjmp(png_jmpbuf(png_ptr)))
{
png_init_io(png_ptr, file);
/* en-tete */
if (!setjmp(png_jmpbuf(png_ptr)))
{
png_set_IHDR(png_ptr, info_ptr, context->Width, context->Height,
8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, (png_colorp)context->Palette, 256);
{
// Commentaires texte PNG
// Cette partie est optionnelle
#ifdef PNG_iTXt_SUPPORTED
png_text text_ptr[2] = {
{-1, "Software", "Grafx2", 6, 0, NULL, NULL},
{-1, "Title", NULL, 0, 0, NULL, NULL}
#else
png_text text_ptr[2] = {
{-1, "Software", "Grafx2", 6},
{-1, "Title", NULL, 0}
#endif
};
int nb_text_chunks=1;
if (context->Comment[0])
{
text_ptr[1].text=context->Comment;
text_ptr[1].text_length=strlen(context->Comment);
nb_text_chunks=2;
}
png_set_text(png_ptr, info_ptr, text_ptr, nb_text_chunks);
}
if (context->Background_transparent)
{
// Transparency
byte opacity[256];
// Need to fill a segment with '255', up to the transparent color
// which will have a 0. This piece of data (1 to 256 bytes)
// will be stored in the file.
memset(opacity, 255,context->Transparent_color);
opacity[context->Transparent_color]=0;
png_set_tRNS(png_ptr, info_ptr, opacity, (int)1 + context->Transparent_color,0);
}
switch(Pixel_ratio)
{
case PIXEL_WIDE:
case PIXEL_WIDE2:
png_set_pHYs(png_ptr, info_ptr, 3000, 6000, PNG_RESOLUTION_METER);
break;
case PIXEL_TALL:
case PIXEL_TALL2:
png_set_pHYs(png_ptr, info_ptr, 6000, 3000, PNG_RESOLUTION_METER);
break;
default:
break;
}
// Write cycling colors
if (context->Color_cycles)
{
// Save a chunk called 'crNg'
// The case is selected by the following rules from PNG standard:
// char 1: non-mandatory = lowercase
// char 2: private (not standard) = lowercase
// char 3: reserved = always uppercase
// char 4: can be copied by editors = lowercase
// First, turn our nice structure into byte array
// (just to avoid padding in structures)
byte *chunk_ptr = cycle_data;
int i;
for (i=0; iColor_cycles; i++)
{
word flags=0;
flags|= context->Cycle_range[i].Speed?1:0; // Cycling or not
flags|= context->Cycle_range[i].Inverse?2:0; // Inverted
// Big end of Rate
*(chunk_ptr++) = (context->Cycle_range[i].Speed*78) >> 8;
// Low end of Rate
*(chunk_ptr++) = (context->Cycle_range[i].Speed*78) & 0xFF;
// Big end of Flags
*(chunk_ptr++) = (flags) >> 8;
// Low end of Flags
*(chunk_ptr++) = (flags) & 0xFF;
// Min color
*(chunk_ptr++) = context->Cycle_range[i].Start;
// Max color
*(chunk_ptr++) = context->Cycle_range[i].End;
}
// Build one unknown_chuck structure
memcpy(crng_chunk.name, "crNg",5);
crng_chunk.data=cycle_data;
crng_chunk.size=context->Color_cycles*6;
crng_chunk.location=PNG_HAVE_PLTE;
// Give it to libpng
png_set_unknown_chunks(png_ptr, info_ptr, &crng_chunk, 1);
// libpng seems to ignore the location I provided earlier.
png_set_unknown_chunk_location(png_ptr, info_ptr, 0, PNG_HAVE_PLTE);
}
png_write_info(png_ptr, info_ptr);
/* ecriture des pixels de l'image */
Row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * context->Height);
pixel_ptr = context->Target_address;
for (y=0; yHeight; y++)
Row_pointers[y] = (png_byte*)(pixel_ptr+y*context->Pitch);
if (!setjmp(png_jmpbuf(png_ptr)))
{
png_write_image(png_ptr, Row_pointers);
/* cloture png */
if (!setjmp(png_jmpbuf(png_ptr)))
{
png_write_end(png_ptr, NULL);
}
else
File_error=1;
}
else
File_error=1;
}
else
File_error=1;
}
else
{
File_error=1;
}
png_destroy_write_struct(&png_ptr, &info_ptr);
}
else
File_error=1;
// fermeture du fichier
fclose(file);
}
// S'il y a eu une erreur de sauvegarde, on ne va tout de même pas laisser
// ce fichier pourri trainait... Ca fait pas propre.
if (File_error)
remove(filename);
if (Row_pointers)
{
free(Row_pointers);
Row_pointers=NULL;
}
}
#endif // __no_pnglib__