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minigimp.c
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minigimp.c
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/* minigimp -- extremely basic image manipulation routines
* by pts@fazekas.hu at Sun Sep 29 22:13:46 CEST 2002
* Tue Oct 1 00:59:37 CEST 2002
* gimpts_drawable_convert() at Thu Oct 3 02:19:52 CEST 2002
* multi-drawable gimpts_drawable_convert() at Sat Oct 5 13:58:54 CEST 2002
* WORKS at Sat Oct 5 16:24:52 CEST 2002
* *_get_rect_bpc at Sun Oct 6 15:32:44 CEST 2002
*
* bad: dhead->next. good: dhead->u.drawable.dnext
* bad: dhead->prev. good: dhead->u.drawable.dprev
*/
#if defined(__GNUC__) && defined(__cplusplus)
#pragma implementation
#endif
#include "minigimp.h"
#include <string.h> /* strlen() */
#include <stdio.h> /* magic... */
#include <stdlib.h> /* exit() */
/* --- Generic resource handling (images and drawables) */
/** GimpImageType: */
#define T_FREE 0
#define T_HEAD 1
#define T_NONE 2
#define T_DRAWABLE_HEAD 3
#define T_PARASITE_HEAD 4
#define T_NORMAL_MIN 5
typedef struct MyRes {
gint32 handle;
/* 0 for free, 1 for head, 2..9 for images, 10..99 for layers */
GimpImageType type;
struct MyRes *prev, *next;
union {
struct {
gdimen_t wd, ht;
GimpParasite *parasite_head;
/** May be NULL, memory-managed by MyRes */
gchar *filename;
gdouble xres, yres;
GimpUnit unit;
/** -2 for GIMP_RGB, -1 for GIMP_GRAY, 0..256 for indexed */
gint ncolors;
/** NULL for non-indexed, malloc(<=3*256) for indexed */
guchar *cmap;
struct MyRes *dhead;
slen_t indexedc;
/** Is the last color in cmap transparent? */
gbool lasttransp;
} image;
struct {
/** u.drawable.gd.type==type */
GimpDrawable gd;
struct MyRes *image;
guchar *data;
/** 0.0 .. 100.0 */
gdouble opacity;
/** Linked list of the drawables belonging to `image' */
struct MyRes *dprev, *dnext;
} drawable;
struct {
/** List of persistent parasites */
GimpParasite *pers;
} head;
} u;
} MyRes;
/** vvv 6..8 */
#define IS_IMAGE(resp) ((resp)!=NULLP && (resp)->type-6U<=2U)
#define IS_LAYER(resp) ((resp)!=NULLP && (resp)->type-11U<=88U)
#define IS_CHANNEL(resp) ((resp)!=NULLP && (resp)->type==GIMP_CHANNEL)
/** A layer or a channel */
#define IS_DRAWABLE(resp) ((resp)!=NULLP && (resp)->type-10U<=89U)
#define MYRES_CACHE_SIZE 16
/** Thread-unsafe! */
static MyRes myres_cache[MYRES_CACHE_SIZE];
static void resInit(void) {
unsigned i=MYRES_CACHE_SIZE;
while (i--!=0) myres_cache[i].type=T_FREE;
myres_cache[0].handle=T_HEAD;
myres_cache[0].type=0; /* head */
myres_cache[0].next=myres_cache[0].prev=myres_cache+0;
myres_cache[0].u.head.pers=gimp_parasite_new("/hd",0/*GIMP_PARASITE_PERSISTENT*/,0,"");
}
/** @return NULL or... */
static MyRes* resFind(gint32 handle) {
static int dummy=0; /* initializer element must be a constant */
MyRes *p;
if (dummy==0) { resInit(); dummy=1; } /* call once in a program */
if (handle<=0) {
return NULL;
} else if (handle<MYRES_CACHE_SIZE) {
return myres_cache[handle].type<T_NORMAL_MIN ? NULL : myres_cache+handle;
} else { /* do linear search */
for (p=myres_cache->next; p!=myres_cache; p=p->next)
if (p->handle==handle) return p;
return NULL;
}
}
static MyRes* resNew(void) {
MyRes *p;
gint32 handle=1;
resFind(0); /* call resInit() */
for (p=myres_cache+1;p!=myres_cache+MYRES_CACHE_SIZE;p++)
if (p->type==T_FREE) { handle=p-myres_cache; goto found; }
/* For simplictity, we allocate a handle larger than any previous one */
for (p=myres_cache->next; p!=myres_cache; p=p->next)
if (p->type!=T_FREE && handle<=p->handle) handle=p->handle+1;
p=g_new(MyRes,1);
found:
p->handle=handle;
p->type=T_NONE; /* just a placeholder */
return p->prev=p->next=p;
}
static void resDelete(MyRes *p) {
resFind(0); /* call resInit() */
assert(p!=NULLP);
assert(p->handle>0); /* must not delete T_HEAD */
p->prev->next=p->next; p->next->prev=p->prev;
if (p->handle<MYRES_CACHE_SIZE) {
assert(p->handle==p-myres_cache);
p->type=T_FREE; /* back to the cache */
} else g_free(p);
}
/* --- Hash46: helper for converting images to indexed */
/** Maximum size. Should be >=2*256 */
#define HASH46_M 1409U
/** Number of _value_ data bytes (they are not hashed) */
#define HASH46_D 1
/** Size of each tuple in the array `t' */
#define HASH46_HD (4+HASH46_D)
/** A tuple is considered free iff its first byte equals HASH46_FREE */
#define HASH46_FREE 255
typedef slen_t hash46_u32_t;
/**
* M=1409
* h(K)=K%1409
* h(i,K)=-i*(1+(K%1408)) (i in 0..1408)
* K=[a,r,g,b]=(a<<24)+(r<<16)+(g<<8)+b (4 bytes)
* h(K)=(253*a+722*r+(g<<8)+b)%1409
* h(i,K)=-i*(1+(896*a+768*r+(g<<8)+b)%1408)
*
* -- No dynamic growing or re-hashing. Useful for hashing colormap palettes
* with a maximum size of 256.
* -- Deleting not supported.
*
* Implementation: Use 32 bit integers for calculation.
* Derived from class Hash46 in sam2p 0.39.
*/
typedef struct Hash46 {
/** Number of occupied elements. */
/* unsigned size; */
/** Number of non-free tuples in the hash. */
unsigned char t[HASH46_M*HASH46_HD];
} Hash46;
static void hash46_init(Hash46 *self) {
/* self->size=0; */
memset(self->t, HASH46_FREE, sizeof(self->t));
}
#if 0 /* not needed, left from sam2p:image.cpp */
inline unsigned char* hash46_lookup(unsigned char k[4]) {
unsigned char *ret=walk(k);
return ret==NULLP || *ret==HASH46_FREE ? (unsigned char*)NULLP : ret;
}
#endif
/** Can be called only if size!=HASH46_M
* @return NULL if isFull() and not found; otherwise: pointer to the tuple
* found or the place to which the insert can take place.
*/
static unsigned char *hash46_walk(Hash46 *self, unsigned char k[4]) {
unsigned i=HASH46_M;
register unsigned char *p;
hash46_u32_t hk, hik;
hk=HASH46_HD*(((((hash46_u32_t)1<<24)%HASH46_M)*k[0]+(((hash46_u32_t)1<<16)%HASH46_M)*k[1]+
(((hash46_u32_t)1<< 8)%HASH46_M)*k[2]+k[3])%HASH46_M);
hik=HASH46_HD*(1+((((hash46_u32_t)1<<24)%(HASH46_M-1))*k[0]+(((hash46_u32_t)1<<16)%(HASH46_M-1))*k[1]+
(((hash46_u32_t)1<< 8)%(HASH46_M-1))*k[2]+k[3])%(HASH46_M-1));
p=self->t+hk;
do {
if (*p==HASH46_FREE || (k[0]==p[0] && k[1]==p[1] && k[2]==p[2] && k[3]==p[3])) return p;
if (hk>=hik) { hk-=hik; p-=hik; }
else { hk+=HASH46_M*HASH46_HD-hik; p+=HASH46_M*HASH46_HD-hik; }
} while (--i!=0);
return (unsigned char*)NULLP;
}
/* --- functions of minigimp.h */
void gimp_pixel_rgn_init (GimpPixelRgn *r, GimpDrawable *drawable,
guint32 x, guint32 y, guint32 width, guint32 height,
gbool writeAllowed /* ?? */, gbool alwaysFALSE) {
MyRes *dra=resFind(drawable->handle);
(void)writeAllowed;
(void)alwaysFALSE;
param_assert(IS_DRAWABLE(dra));
assert(drawable==&dra->u.drawable.gd);
/* g_message("pri %u %u %u %u\n", x, y, width, height); */
if (x>drawable->width) x=width=0;
else if (x+width>drawable->width) width=drawable->width-x;
if (y>drawable->height) y=height=0;
else if (y+height>drawable->height) height=drawable->height-y;
r->width=(r->minx=x)+width;
r->height=(r->miny=y)+height;
r->bpp=drawable->bpp;
r->bpl=drawable->bpp*drawable->width;
r->topleft=dra->u.drawable.data;
r->type=drawable->type;
}
void gimp_pixel_rgn_init_rel (GimpPixelRgn *r, GimpDrawable *drawable,
guint32 x, guint32 y, guint32 width, guint32 height,
gbool writeAllowed /* ?? */, gbool alwaysFALSE) {
MyRes *dra=resFind(drawable->handle);
(void)writeAllowed;
(void)alwaysFALSE;
param_assert(IS_DRAWABLE(dra));
assert(drawable==&dra->u.drawable.gd);
/* g_message("pri %u %u %u %u\n", x, y, width, height); */
if (x>drawable->width) x=width=0;
else if (x+width>drawable->width) width=drawable->width-x;
if (y>drawable->height) y=height=0;
else if (y+height>drawable->height) height=drawable->height-y;
r->minx=r->miny=0;
r->width=width;
r->height=height;
r->bpp=drawable->bpp;
r->bpl=drawable->bpp*drawable->width;
r->topleft=dra->u.drawable.data+r->bpl*y+r->bpp*x;
}
void gimp_pixel_rgn_set_rect(GimpPixelRgn *r, guchar const*src,
guint32 x, guint32 y, guint32 width, guint32 height) {
guchar *p;
gsize_t wskip, bpl;
/* g_message("SET %u %u %u %u rh=%u\n", x, y, width, height, r->height); */
/* g_message("set w=%u h=%u\n", width, height); */
wskip=r->bpp*width;
if (y<r->miny) { src+=wskip *(r->miny-y); y=r->miny; }
if (x<r->minx) { src+=r->bpp*(r->minx-x); x=r->minx; }
if (x>=r->width || y>=r->height) return;
width=r->bpp*((x+width>r->width)?r->width-x:width);
/* ^^^ Imp: is sizeof(width) enough? */
if (y+height>r->height) height=r->height-y;
p=r->topleft+(bpl=r->bpl)*y+r->bpp*x;
while (height--!=0) {
memcpy(p, src, width);
p+=bpl;
src+=wskip;
}
}
void gimp_pixel_rgn_get_rect(GimpPixelRgn *r, guchar *dst,
guint32 x, guint32 y, guint32 width, guint32 height) {
/* Sat Oct 5 14:13:51 CEST 2002 */
guchar *p;
gsize_t wskip, bpl;
wskip=r->bpp*width;
if (y<r->miny) { dst+=wskip *(r->miny-y); y=r->miny; }
if (x<r->minx) { dst+=r->bpp*(r->minx-x); x=r->minx; }
if (x>=r->width || y>=r->height) return;
width=r->bpp*((x+width>r->width)?r->width-x:width);
/* ^^^ Imp: is sizeof(width) enough? */
if (y+height>r->height) height=r->height-y;
p=r->topleft+(bpl=r->bpl)*y+r->bpp*x;
while (height--!=0) {
memcpy(dst, p, width);
p+=bpl;
dst+=wskip;
}
}
/** Select the low bits of each sample */
#define BITS_LOW 0
/** Select the high bits of each sample */
#define BITS_HIGH 16
/** Select the low bits of even samples, high bits of odd samples */
#define BITS_MIX 32
void gimp_pixel_rgn_get_rect_bpc(GimpPixelRgn *r, guchar *dst,
guint32 x, guint32 y, guint32 width, guint32 height, guchar dstbpc,
gbool yflip) {
/* Sun Oct 6 15:31:35 CEST 2002 */
slendiff_t wskip;
gsize_t bpl, wcopy;
register guchar c, *p;
register gsize_t wleft;
unsigned wcopylow;
/* register unsigned biteq; */
param_assert(dstbpc==1 || dstbpc==2 || dstbpc==4 || dstbpc==8);
wskip=(dstbpc==8) ? r->bpp*width : (r->bpp*dstbpc*width+7)>>3;
if (y<r->miny) { dst+=wskip *(r->miny-y); y=r->miny; }
if (x<r->minx) { dst+=r->bpp*(r->minx-x); x=r->minx; }
if (x>=r->width || y>=r->height || width==0 || height==0) return;
wcopy=r->bpp*((x+width>r->width)?r->width-x:width);
assert(wcopy>0);
if (y+height>r->height) height=r->height-y;
p=r->topleft+(bpl=r->bpl)*y+r->bpp*x;
if (yflip) { dst+=(height-1)*wskip; wskip=-wskip; }
if (dstbpc==8) {
while (height--!=0) {
memcpy(dst, p, wcopy);
p+=bpl;
dst+=wskip;
}
return;
}
bpl-=wcopy;
switch (dstbpc+(r->type==GIMP_INDEXEDA_IMAGE ? BITS_MIX :
r->type==GIMP_INDEXED_IMAGE ? BITS_LOW : BITS_HIGH) ) {
case 1+BITS_LOW:
#if 0
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 */
/* q . . . . . . . */
biteq=wcopy&7;
while (height--!=0) {
wleft=wcopy; q=dst; c=0;
do {
c=(c<<1)|(*p++&1);
if ((--wleft&7)==biteq) { *q++=c; c=0; }
} while (wleft!=0);
if (biteq!=0) *q++=c<<(8-biteq);
memcpy(dst, p, wcopy);
p+=bpl;
dst+=wskip;
}
#else
wcopylow=wcopy&7; wskip-=wcopy>>=3;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[0]&1)<<7)|((p[1]&1)<<6)|((p[2]&1)<<5)|((p[3]&1)<<4)
|((p[4]&1)<<3)|((p[5]&1)<<2)|((p[6]&1)<<1)| (p[7]&1);
p+=8;
}
if (0!=wcopylow) {
wleft=wcopylow; c=0;
while (wleft--!=0) c=(c<<1)|(*p++&1);
*dst=c<<1*(8-wcopylow);
}
p+=bpl; dst+=wskip;
}
#endif
break;
case 2+BITS_LOW:
wcopylow=wcopy&3; wskip-=wcopy>>=2;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[0]&3)<<6)|((p[1]&3)<<4)|((p[2]&3)<<2)|(p[3]&3);
p+=4;
}
if (0!=wcopylow) {
wleft=wcopylow; c=0;
while (wleft--!=0) c=(c<<2)|(*p++&3);
*dst=c<<2*(4-wcopylow);
}
p+=bpl; dst+=wskip;
}
break;
case 4+BITS_LOW:
wcopylow=wcopy&1; wskip-=wcopy>>=1;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[1]&15)<<4)|(p[2]&15);
p+=2;
}
if (0!=wcopylow) *dst=(*p++&15)<<4;
p+=bpl; dst+=wskip;
}
break;
case 1+BITS_HIGH:
wcopylow=wcopy&7; wskip-=wcopy>>=3;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++= (p[0]&128) |((p[1]&128)>>1)|((p[2]&128)>>2)|((p[3]&128)>>3)
|((p[4]&128)>>4)|((p[5]&128)>>5)|((p[6]&128)>>6)|((p[7]&128)>>7);
p+=8;
}
if (0!=wcopylow) {
wleft=wcopylow; c=0;
while (wleft--!=0) c=(c<<1)|((*p++&128)>>7);
*dst=c<<1*(8-wcopylow);
}
p+=bpl; dst+=wskip;
}
break;
case 2+BITS_HIGH:
wcopylow=wcopy&3; wskip-=wcopy>>=2;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=(p[0]&192)|((p[1]&192)>>2)|((p[2]&192)>>4)|((p[3]&192)>>6);
p+=4;
}
if (0!=wcopylow) {
wleft=wcopylow; c=0;
while (wleft--!=0) c=(c<<1)|((*p++&192)>>6);
*dst=c<<2*(4-wcopylow);
}
p+=bpl; dst+=wskip;
}
break;
case 4+BITS_HIGH:
wcopylow=wcopy&1; wskip-=wcopy>>=1;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=(p[0]&240)|((p[1]&240)>>4);
p+=2;
}
if (0!=wcopylow) *dst=(*p++&240);
p+=bpl; dst+=wskip;
}
break;
case 1+BITS_MIX:
wcopylow=wcopy&7; wskip-=wcopy>>=3;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[0]& 1)<<7)|((p[1]&128)>>1)|((p[2]& 1)<<5)|((p[3]&128)>>3)
|((p[4]& 1)<<3)|((p[5]&128)>>5)|((p[6]& 1)<<1)|((p[7]&128)>>7);
p+=8;
}
if (0!=wcopylow) {
c=0;
for (wleft=0; wleft<wcopylow; wleft++)
c|=((wleft&1)==0) ? (*p++&1)<<(7-wleft) : (*p++&128)>>wleft;
*dst=c<<1*(8-wcopylow);
}
p+=bpl; dst+=wskip;
}
break;
case 2+BITS_MIX:
wcopylow=wcopy&3; wskip-=wcopy>>=2;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[0]&3)<<6)|((p[1]&192)>>2)|((p[2]&3)<<2)|((p[3]&192)>>6);
p+=4;
}
if (0!=wcopylow) {
*dst=(*p++&3)<<6;
if (wcopylow>=2) {
*dst|=(*p++&192)>>2;
if (wcopylow>=3) *dst|=(*p++&3)<<2;
}
}
p+=bpl; dst+=wskip;
}
break;
case 4+BITS_MIX:
wcopylow=wcopy&1; wskip-=wcopy>>=1;
while (height--!=0) {
wleft=wcopy;
while (wleft--!=0) {
*dst++=((p[0]&15)<<4)|((p[1]&240)>>4);
p+=2;
}
if (0!=wcopylow) *dst=(p[0]&15)<<4;
p+=bpl; dst+=wskip;
}
break;
default: assert(0);
} /* SWITCH */
}
void gimp_image_add_layer(gint32 image, gint32 hlayer, unsigned dummy){
MyRes *img=resFind(image);
MyRes *dra=resFind(hlayer);
(void)dummy;
assert(IS_IMAGE(img));
assert(IS_LAYER(dra));
assert(dra->type==dra->u.drawable.gd.type);
if (dra->u.drawable.image!=NULLP) gimpts_drawable_unlink(dra->handle);
dra->u.drawable.image=img;
dra->u.drawable.dprev=img->u.image.dhead->u.drawable.dprev;
dra->u.drawable.dnext=img->u.image.dhead;
img->u.image.dhead->u.drawable.dprev->u.drawable.dnext=dra;
img->u.image.dhead->u.drawable.dprev=dra;
if ((dra->type|1)==GIMP_INDEXEDA_IMAGE) img->u.image.indexedc++;
}
void gimp_image_add_channel(gint32 image, gint32 hchannel, unsigned dummy){
MyRes *img=resFind(image);
MyRes *dra=resFind(hchannel);
(void)dummy;
assert(IS_IMAGE(img));
assert(IS_CHANNEL(dra));
assert(dra->type==dra->u.drawable.gd.type);
if (dra->u.drawable.image!=NULLP) gimpts_drawable_unlink(dra->handle);
dra->u.drawable.image=img;
dra->u.drawable.dprev=img->u.image.dhead->u.drawable.dprev;
dra->u.drawable.dnext=img->u.image.dhead;
img->u.image.dhead->u.drawable.dprev->u.drawable.dnext=dra;
img->u.image.dhead->u.drawable.dprev=dra;
}
void gimpts_drawable_unlink(gint32 hdrawable) {
MyRes *dra=resFind(hdrawable);
MyRes *img;
assert(IS_DRAWABLE(dra));
if ((img=dra->u.drawable.image)!=NULLP) {
if ((dra->type|1)==GIMP_INDEXEDA_IMAGE && (0==--img->u.image.indexedc)) {
g_free(img->u.image.cmap);
img->u.image.cmap=(guchar*)NULLP;
}
}
dra->u.drawable.dnext->u.drawable.dprev=dra->u.drawable.dprev;
dra->u.drawable.dprev->u.drawable.dnext=dra->u.drawable.dnext;
dra->u.drawable.image=(MyRes*)NULLP;
}
void gimp_drawable_flush (GimpDrawable* drawable){
/* A simple no-op here */
(void)drawable;
}
void gimp_drawable_detach(GimpDrawable* drawable){
/* A simple no-op again :-) */
(void)drawable;
}
gint32 gimp_layer_new (gint32 image, char const*name /*_("Background")*/,
guint32 cols, guint32 rows, gint layer_type, gdouble opacity /*100.0*/, unsigned mode) {
MyRes *lay;
lay=resNew();
(void)image;
param_assert(layer_type==GIMP_RGB_IMAGE || layer_type==GIMP_GRAY_IMAGE || layer_type==GIMP_INDEXED_IMAGE
|| layer_type==GIMP_RGBA_IMAGE || layer_type==GIMP_GRAYA_IMAGE || layer_type==GIMP_INDEXEDA_IMAGE);
param_assert(cols>=1);
param_assert(rows>=1);
param_assert(0.0<=opacity && opacity<=100.0);
param_assert(mode==GIMP_NORMAL_MODE);
lay->type=layer_type;
lay->u.drawable.gd.name=g_strdup(name);
lay->u.drawable.gd.handle=lay->handle;
lay->u.drawable.gd.width =cols;
lay->u.drawable.gd.height=rows;
lay->u.drawable.opacity=opacity;
lay->u.drawable.gd.bpp=
layer_type==GIMP_RGB_IMAGE ? 3 : layer_type==GIMP_GRAY_IMAGE ? 1 : layer_type==GIMP_INDEXED_IMAGE ? 1 :
layer_type==GIMP_RGBA_IMAGE ? 4 : layer_type==GIMP_GRAYA_IMAGE ? 2 : layer_type==GIMP_INDEXEDA_IMAGE ? 2 : 0;
lay->u.drawable.gd.type=layer_type;
lay->u.drawable.gd.bpc=8;
lay->u.drawable.gd.mode=mode;
lay->u.drawable.dprev=lay->u.drawable.dnext=lay;
lay->u.drawable.image=(MyRes*)NULLP;
lay->u.drawable.data=g_new(guchar, (gsize_t)lay->u.drawable.gd.bpp*cols*rows);
return lay->handle;
}
gint32 gimp_channel_new(gint32 image, char const*name /*_("TIFF Channel")*/,
guint32 cols, guint32 rows, gdouble opacity, GimpRGB *color){
MyRes *cha;
(void)color;
(void)image;
cha=resNew();
param_assert(cols>=1);
param_assert(rows>=1);
param_assert(0.0<=opacity && opacity<=100.0);
cha->u.drawable.gd.name=g_strdup(name);
cha->u.drawable.gd.handle=cha->handle;
cha->u.drawable.gd.width =cols;
cha->u.drawable.gd.height=rows;
cha->u.drawable.opacity=opacity;
cha->u.drawable.gd.bpp=1;
cha->u.drawable.gd.type=cha->type=GIMP_CHANNEL;
cha->u.drawable.gd.bpc=8;
cha->u.drawable.gd.mode=GIMP_NORMAL_MODE;
cha->u.drawable.dprev=cha->u.drawable.dnext=cha;
cha->u.drawable.image=(MyRes*)NULLP;
cha->u.drawable.data=g_new(guchar, cols*rows);
return cha->handle;
}
#if 0 /* implemented in minigimp.h */
guint32 gimp_tile_height(void){ return (guint32)(-1U>>1); }
#endif
gdouble gimp_unit_get_factor (GimpUnit unit){
return unit==GIMP_UNIT_INCH ? 1.0
: unit==GIMP_UNIT_MM ? 25.4
: unit==GIMP_UNIT_PIXEL ? 72.0
: 0.0;
}
#if PTS_USE_GIMPRGB
void gimp_rgb_set(GimpRGB *color, gfloat r, gfloat g, gfloat b){
assert(0);
}
#endif
char *gimp_get_default_comment(void){
return "MiniGIMP by pts@fazekas.hu";
}
void gimp_quit (void){
exit(2);
}
void gimp_parasite_free(GimpParasite*parasite){
if (parasite!=NULLP) {
assert(parasite->refc>0);
if (0==--parasite->refc) {
/* Imp: save persistents to T_HEAD */
#if 0 /* by now next and prev are assumed to be invalid */
parasite->next->prev=parasite->prev;
parasite->prev->next=parasite->next;
#endif
g_free(parasite); /* also frees the two strings */
}
}
}
GimpParasite *gimp_parasite_new(char const*name, unsigned opts, gsize_t size, void *data){
gsize_t namesize=strlen(name)+1;
GimpParasite *parasite=(GimpParasite*)g_malloc(sizeof(GimpParasite)+namesize+size);
(void)opts;
parasite->name=gimp_parasite_name(parasite);
memcpy(parasite->name, name, namesize);
parasite->data=(guchar*)(parasite->name+namesize);
memcpy(parasite->data, data, size);
parasite->data_size=size;
parasite->refc=1;
return parasite->prev=parasite->next=parasite; /* no neighbours */
}
gint32 gimp_image_new(gint cols, gint rows, gint image_type){
MyRes *img, *dhead;
GimpParasite *phead;
param_assert(image_type==GIMP_RGB || image_type==GIMP_GRAY || image_type==GIMP_INDEXED);
param_assert(cols>=1);
param_assert(rows>=1);
img=resNew();
img->type=image_type;
img->u.image.wd=cols;
img->u.image.ht=rows;
phead=img->u.image.parasite_head=g_new(GimpParasite, 1);
/* ^^^ old: =gimp_parasite_new("/hd",0/:GIMP_PARASITE_PERSISTENT:/,0,""); */
phead->next=phead->prev=phead;
phead->name=0;
phead->data=0;
phead->data_size=0;
phead->refc=0;
dhead=img->u.image.dhead=g_new(MyRes, 1);
dhead->prev=dhead->next=dhead;
dhead->u.drawable.dnext=dhead->u.drawable.dprev=dhead;
dhead->handle=0;
dhead->type=T_DRAWABLE_HEAD;
img->u.image.filename=(gchar*)NULLP;
img->u.image.xres=1.0;
img->u.image.yres=1.0;
img->u.image.unit=GIMP_UNIT_PIXEL;
img->u.image.ncolors=image_type==GIMP_INDEXED?0:image_type==GIMP_RGB?-2:-1;
img->u.image.cmap=(guchar*)NULLP;
img->u.image.indexedc=0;
img->u.image.lasttransp=FALSE;
return img->handle;
}
GimpDrawable* gimp_drawable_get(gint32 hdrawable){
MyRes *dra=resFind(hdrawable);
assert(IS_DRAWABLE(dra));
return &dra->u.drawable.gd;
}
GimpImageType gimp_drawable_type(gint32 hdrawable){
MyRes *dra=resFind(hdrawable);
assert(IS_DRAWABLE(dra));
return dra->type;
}
void gimp_image_set_filename(gint32 image, char const* filename){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
if (img->u.image.filename!=NULLP) g_free(img->u.image.filename);
img->u.image.filename=g_strdup(filename); /* works for NULLP */
}
GimpParasite* gimp_image_parasite_find (gint32 image, char const*parasite_name) {
/* Imp: also search for parasites of T_HEAD */
/* Imp: disallow "/hd" */
MyRes *img=resFind(image);
GimpParasite *p, *head;
param_assert(IS_IMAGE(img));
for (p=(head=img->u.image.parasite_head)->next; p!=head; p=p->next) /* linear search */
if (0==strcmp(parasite_name, gimp_parasite_name(p))) { p->refc++; return p; }
/* resFind() has been already called */
for (p=(head=myres_cache[0].u.head.pers)->next; p!=head; p=p->next) /* linear search */
if (0==strcmp(parasite_name, gimp_parasite_name(p))) { p->refc++; return p; }
return (GimpParasite*)NULLP;
}
void gimp_image_parasite_attach(gint32 image, GimpParasite *parasite){
/* Imp: disallow "/hd" */
MyRes *img=resFind(image);
GimpParasite *p, *head;
char *parasite_name;
param_assert(IS_IMAGE(img));
parasite_name=gimp_parasite_name(parasite);
for (p=(head=img->u.image.parasite_head)->next; p!=head; p=p->next) { /* linear search */
if (0==strcmp(parasite_name, gimp_parasite_name(p))) { /* remove old */
p->prev->next=p->next; p->next->prev=p->prev;
gimp_parasite_free(p);
break;
}
}
parasite->refc++;
parasite->prev=head->prev;
parasite->next=head;
head->prev->next=parasite;
head->prev=parasite;
}
static void gimp_drawable_free0(MyRes *dra) {
assert(IS_DRAWABLE(dra)); /* not param_assert */
#if 0
g_free(*(char**)&dra->u.drawable.gd.name); /* pacify gcc warning */
#else
g_free(dra->u.drawable.gd.name);
#endif
g_free(dra->u.drawable.data);
dra->u.drawable.data=(guchar*)NULLP; /* failsafe */
dra->u.drawable.image=(MyRes*)NULLP; /* failsafe */
resDelete(dra);
}
void gimp_drawable_free(gint32 hdrawable) {
MyRes *dra=resFind(hdrawable);
assert(IS_DRAWABLE(dra));
dra->u.drawable.dnext->u.drawable.dprev=dra->u.drawable.dprev;
dra->u.drawable.dprev->u.drawable.dnext=dra->u.drawable.dnext;
gimp_drawable_free0(dra);
}
void gimp_image_delete (gint32 image){
MyRes *img=resFind(image), *rp, *dhead;
GimpParasite *p, *phead;
param_assert(IS_IMAGE(img));
g_free(img->u.image.cmap); /* may be NULLP */
g_free(img->u.image.filename); /* may be NULLP */
for (p=(phead=img->u.image.parasite_head)->next; p!=phead; ) { /* iteration */
p=p->next; gimp_parasite_free(p->prev); /* trick not to use p->next after free() */
}
g_free(phead);
for (rp=(dhead=img->u.image.dhead)->u.drawable.dnext; rp!=dhead; ) { /* iteration */
rp=rp->u.drawable.dnext;
gimp_drawable_free0(rp->u.drawable.dprev); /* trick not to use p->...dnext after free() */
}
g_free(dhead);
resDelete(img);
}
void gimp_image_set_resolution (gint32 image, gdouble xres, gdouble yres){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
img->u.image.xres=xres;
img->u.image.yres=yres;
}
void gimp_image_set_unit (gint32 image, GimpUnit unit){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
param_assert(0<unit && unit<=GIMP_UNIT__MAX);
img->u.image.unit=unit;
}
void gimp_image_set_cmap(gint32 image, guchar *cmap, guint ncolors){
MyRes *img=resFind(image);
param_assert(img->type==GIMP_INDEXED); /* implied: param_assert(IS_IMAGE(img)); */
param_assert(0<=(int)ncolors && ncolors<=256);
if (img->u.image.ncolors+0U<ncolors) { /* true for the first call to thisfn */
g_free(img->u.image.cmap);
img->u.image.cmap=g_new(guchar, ncolors*3);
} /* Dat: waste some memory until image is deleted */
img->u.image.ncolors=ncolors;
ncolors*=3; /* guint is wide enough */
memcpy(img->u.image.cmap, cmap, ncolors);
}
guchar* gimp_image_get_cmap(gint32 image, gint *ncolors){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
if (ncolors!=NULLP) *ncolors=img->u.image.ncolors;
return img->u.image.cmap;
}
void gimp_image_get_resolution (gint32 image, gdouble *xres, gdouble *yres){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
*xres=img->u.image.xres;
*yres=img->u.image.yres;
}
GimpUnit gimp_image_get_unit (gint32 image){
MyRes *img=resFind(image);
param_assert(IS_IMAGE(img));
return img->u.image.unit;
}
void gimpts_rgb2indexed(void *img0, guchar *dst, gsize_t srclen, guint *ncolors_ret, guchar cmap_ret[768], guchar *src, unsigned adst, unsigned asrc) {
/* Thu Oct 3 00:00:20 CEST 2002 */
/* derived from sam2p: Image::Sampled* Image::Sampled::toIndexed0() */
MyRes *img=(MyRes*)img0;
unsigned ncols=0;
Hash46 h;
unsigned char k[4], *w, *c, *cend, *srcend=src+srclen;
k[0]=0;
hash46_init(&h);
if (img!=NULLP && img->u.image.cmap!=NULLP) { /* keep cmap we already have */
cend=(c=img->u.image.cmap)+3*(0U+img->u.image.ncolors);
while (c!=cend) {
k[1]=c[0]; k[2]=c[1]; k[3]=c[2]; c+=3;
w=hash46_walk(&h, k);
assert_slow(w!=NULL); /* Hash cannot be full since h.M>=256. */
if (*w==HASH46_FREE) {
assert(ncols<256);
w[0]=0;
*cmap_ret++=w[1]=k[1];
*cmap_ret++=w[2]=k[2];
*cmap_ret++=w[3]=k[3];
w[4]=ncols++;
}
} /* WHILE */
} /* IF */
while (src!=srcend) {
/* Dat: asrc<=2: GIMP_GRAYA_IMAGE | GIMP_GRAY_IMAGE | GIMP_CHANNEL */
if (asrc<=2) { k[1]=k[2]=k[3]=src[0]; }
else { k[1]=src[0]; k[2]=src[1]; k[3]=src[2]; }
w=hash46_walk(&h, k);
/* Dat: fast, collision-free walk is guaranteed if asrc<=2 && only_1_drawable */
assert_slow(w!=NULL); /* Hash cannot be full since h.M>=256. */
if (*w==HASH46_FREE) {
if (ncols==256) { *ncolors_ret=0; return; }
/* ^^^ too many colors; cannot convert image to indexed */
w[0]=0;
*cmap_ret++=w[1]=k[1];
*cmap_ret++=w[2]=k[2];
*cmap_ret++=w[3]=k[3];
*dst=w[4]=ncols++;
} else { /* a color that we have already seen */
*dst=w[4];
}
src+=asrc; dst+=adst;
}
*ncolors_ret=ncols;
}
void gimpts_indexed_packpal(guchar *dst, guchar *dstend, guint *ncolors_inout, guchar cmap_inout[768], gbool alpha) {
/* Thu Oct 3 00:22:37 CEST 2002 */
/* derived from sam2p: packPal(), but handles transparency differently */
unsigned ncols=0;
Hash46 h;
unsigned char k[4], *w, used[256], old2new[256], *src, *srcend, *cmap_ret, *o, *u;
k[0]=0;
hash46_init(&h);
/* Find which colors are really used in the image */
memset(used,'\0',256);
w=dst;
if (alpha) { while (w!=dstend) used[*w++]=1; }
else { while (w!=dstend) { used[*w]=1; w+=2; } }
/* Eliminate unused and duplicate entries from the palette */
cmap_ret=src=cmap_inout; srcend=src+3*ncolors_inout[0]; u=used; o=old2new;
while (src!=srcend) {
if (*u++!=0) { /* color is used */
k[1]=src[0]; k[2]=src[1]; k[3]=src[2];
w=hash46_walk(&h, k);
assert_slow(w!=NULL); /* Hash cannot be full since h.M>=256. */
if (*w==HASH46_FREE) {
assert_slow(ncols!=256); /* cannot have that many colors in cmap */
w[0]=0;
*cmap_ret++=w[1]=k[1];
*cmap_ret++=w[2]=k[2];
*cmap_ret++=w[3]=k[3];
*o=w[4]=ncols++;
} else { /* a color that we have already seen */
*o=w[4];
}
}
o++; src+=3;
}
ncolors_inout[0]=ncols;
/* Update the image to reflect the new palette */
while (dst!=dstend) { *dst=old2new[*dst]; dst++; }
}
#if 0
static void gimpts_colors_used(MyRes *rp, guchar used[256]) {
guchar *w, guchar *dstend;
switch (rp->type) {
case GIMP_INDEXEDA_IMAGE:
dstend=(w=rp->u.drawable.data)+(gsize_t)dra->u.drawable.gd.height*dra->u.drawable.gd.width;
while (w!=dstend) { used[*w]=1; w+=2; }
case GIMP_INDEXED_IMAGE:
dstend=(w=rp->u.drawable.data)+(gsize_t)dra->u.drawable.gd.height*dra->u.drawable.gd.width;
while (w!=dstend) used[*w++]=1;
}
}
#endif
void gimpts_drawable_packpal(gint32 hdrawable, gint32 himage) {
MyRes *dra, *img, *rp=0 /*pacify g++-2.91*/, *dhead;
/* Thu Oct 3 00:22:37 CEST 2002 -- Sat Oct 5 11:31:39 CEST 2002 */
/* derived from gimpts_indexed_packpal() */
gbool onep;
unsigned ncols=0;
Hash46 h;
unsigned char *dstend, k[4], *w, used[256], old2new[256], *src, *srcend, *cmap_ret, *o, *u;
memset(used,'\0',256);
if (hdrawable==0) {
dra=(MyRes*)NULLP;
param_assert(himage!=0);
img=resFind(himage);
param_assert(IS_IMAGE(img));
dhead=img->u.image.dhead;
if (img->u.image.indexedc<1) return;
onep=(img->u.image.indexedc==1);
rp=dhead->u.drawable.dnext; /* BUGFIX at Sun Oct 13 20:36:10 CEST 2002 */
} else {
dra=resFind(hdrawable);
param_assert(IS_DRAWABLE(dra));
if ((dra->type|1)!=GIMP_INDEXEDA_IMAGE) return;
if ((img=dra->u.drawable.image)==NULLP) return;
dhead=img->u.image.dhead;
param_assert(himage==0 || img->handle==himage);
rp=dra;
onep=TRUE;
}
for (; rp!=dhead; rp=rp->u.drawable.dnext) if ((rp->type|1)==GIMP_INDEXEDA_IMAGE) { /* iteration */
switch (rp->type) { /* gimpts_colors_used(rp, used); */
case GIMP_INDEXEDA_IMAGE:
dstend=(w=rp->u.drawable.data)+(gsize_t)rp->u.drawable.gd.height*rp->u.drawable.gd.width;
while (w!=dstend) { used[*w]=1; w+=2; }
case GIMP_INDEXED_IMAGE:
dstend=(w=rp->u.drawable.data)+(gsize_t)rp->u.drawable.gd.height*rp->u.drawable.gd.width;
while (w!=dstend) used[*w++]=1;
}
if (onep) { hdrawable=(dra=rp)->handle; break; }
}
assert(img->u.image.ncolors>=0);
assert(img->u.image.cmap!=NULLP);
k[0]=0;
hash46_init(&h);
/* Eliminate unused and duplicate entries from the palette */
cmap_ret=src=img->u.image.cmap;
srcend=src+3*img->u.image.ncolors; u=used; o=old2new;
while (src!=srcend) {
if (*u++!=0) { /* color is used */
k[1]=src[0]; k[2]=src[1]; k[3]=src[2];
w=hash46_walk(&h, k);
assert_slow(w!=NULL); /* Hash cannot be full since h.M>=256. */
if (*w==HASH46_FREE) {
assert_slow(ncols!=256); /* cannot have that many colors in cmap */
w[0]=0;
*cmap_ret++=w[1]=k[1];
*cmap_ret++=w[2]=k[2];
*cmap_ret++=w[3]=k[3];
*o=w[4]=ncols++;
} else { /* a color that we have already seen */
*o=w[4];
}
}
o++; src+=3;
}
/* Update the image to reflect the new palette */
if (ncols!=0U+img->u.image.ncolors) {
assert(ncols<0U+img->u.image.ncolors);
rp=(dra==NULLP)?dhead->u.drawable.dnext:dra; /* BUGFIX at Sun Oct 13 20:36:19 CEST 2002 */
do {
if ((rp->type|1)==GIMP_INDEXEDA_IMAGE) { /* iteration */
dstend=(w=rp->u.drawable.data)+(gsize_t)rp->u.drawable.gd.height*rp->u.drawable.gd.width;
while (w!=dstend) { *w=old2new[*w]; w++; }
if (dra!=NULLP) break;
}
} while ((rp=rp->u.drawable.dnext)!=dhead);
}
}
static void drawable_convert_low(MyRes *dra, GimpImageType dt, gbool force_dup) {
/* Thu Oct 3 01:00:25 CEST 2002 -- Sat Oct 5 13:56:03 CEST 2002 */
/* unsigned u; */
gsize_t wdht;
guchar *p, *pend, *q, *data, *newdata;
/* guchar newcmap[768]; */
guchar *newcmap,
*cp=(guchar*)NULLP, *cpend=(guchar*)NULLP, *cq=(guchar*)NULLP;
unsigned char newbpp;
MyRes *img;
/* assert(IS_DRAWABLE(dra)); */
if (dt==dra->type) return;
wdht=(gsize_t)dra->u.drawable.gd.height*dra->u.drawable.gd.width;
pend=(data=p=dra->u.drawable.data)+wdht*dra->u.drawable.gd.bpp;
newbpp=1;
switch (dt) {
case GIMP_GRAYA_IMAGE: case GIMP_INDEXEDA_IMAGE: (newbpp=2); break;
case GIMP_RGB_IMAGE: (newbpp=3); break;
case GIMP_RGBA_IMAGE: (newbpp=4); break;
/* case GIMP_CHANNEL: case GIMP_GRAY_IMAGE: case GIMP_INDEXED_IMAGE: break; */
}
/* (wdhtbpp!=wdht*dra->u.drawable.gd.bpp) */
q=newdata=(force_dup || newbpp!=dra->u.drawable.gd.bpp)?g_new(guchar, wdht*newbpp):p;
if (dra->u.drawable.image!=NULLP) {
cq=cp=dra->u.drawable.image->u.image.cmap;
cpend=cp+dra->u.drawable.image->u.image.ncolors*3;
}