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xvimage.c
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/*
* xvimage.c - image manipulation functions (crop,resize,rotate...) for XV
*
* Contains:
* void Resize(int, int)
* void GenerateCpic()
* void GenerateEpic(w,h)
* void Crop()
* void UnCrop()
* void AutoCrop()
* void DoCrop(x,y,w,h)
* void Rotate(int)
* void RotatePic();
* void InstallNewPic(void);
* void DrawEpic(void);
* byte *FSDither()
* void CreateXImage()
* void Set824Menus( pictype );
* void Change824Mode( pictype );
* int DoPad(mode, str, wide, high, opaque, omode);
* int LoadPad(pinfo, fname);
*/
#include "copyright.h"
#include "xv.h"
static void flipSel PARM((int));
static void do_zoom PARM((int, int));
static void compute_zoom_rect PARM((int, int, int*, int*, int*, int*));
static void do_unzoom PARM((void));
static void do_pan PARM((int, int));
static void do_pan_calc PARM((int, int, int *, int *));
static void crop1 PARM((int, int, int, int, int));
static int doAutoCrop24 PARM((void));
static void floydDitherize1 PARM((XImage *, byte *, int, int, int,
byte *, byte *,byte *));
static int highbit PARM((unsigned long));
static int doPadSolid PARM((char *, int, int, int, int));
static int doPadBggen PARM((char *, int, int, int, int));
static int doPadLoad PARM((char *, int, int, int, int));
static int doPadPaste PARM((byte *, int, int, int, int));
static int ReadImageFile1 PARM((char *, PICINFO *));
/* The following array represents the pixel values for each shade
* of the primary color components.
* If 'p' is a pointer to a source image rgb-byte-triplet, we can
* construct the output pixel value simply by 'oring' together
* the corresponding components:
*
* unsigned char *p;
* unsigned long pixval;
*
* pixval = screen_rgb[0][*p++];
* pixval |= screen_rgb[1][*p++];
* pixval |= screen_rgb[2][*p++];
*
* This is both efficient and generic, since the only assumption
* is that the primary color components have separate bits.
* The order and distribution of bits does not matter, and we
* don't need additional variables and shifting/masking code.
* The array size is 3 KBytes total and thus very reasonable.
*/
static unsigned long screen_rgb[3][256];
/* The following array holds the exact color representations
* reported by the system.
* This is useful for less than 24 bit deep displays as a base
* for additional dithering to get smoother output.
*/
static byte screen_set[3][256];
/* The following routine initializes the screen_rgb and screen_set
* arrays.
* Since it is executed only once per program run, it does not need
* to be super-efficient.
*
* The method is to draw points in a pixmap with the specified shades
* of primary colors and then get the corresponding XImage pixel
* representation.
* Thus we can get away with any Bit-order/Byte-order dependencies.
*
* The routine uses some global X variables:
* theDisp, theScreen, dispDEEP, and theCmap.
* Adapt these to your application as necessary.
* I've not passed them in as parameters, since for other platforms
* than X these may be different (see vfixpix.c), and so the
* screen_init() interface is unique.
*/
static void screen_init()
{
static int init_flag; /* assume auto-init as 0 */
Pixmap check_map;
GC check_gc;
XColor check_col;
XImage *check_image;
int ci, i;
if (init_flag) return;
init_flag = 1;
check_map = XCreatePixmap(theDisp, RootWindow(theDisp,theScreen),
1, 1, dispDEEP);
check_gc = XCreateGC(theDisp, check_map, 0, NULL);
for (ci = 0; ci < 3; ci++) {
for (i = 0; i < 256; i++) {
check_col.red = 0;
check_col.green = 0;
check_col.blue = 0;
/* Do proper upscaling from unsigned 8 bit (image data values)
to unsigned 16 bit (X color representation). */
((unsigned short *)&check_col.red)[ci] = (unsigned short)((i << 8) | i);
if (theVisual->class == TrueColor)
XAllocColor(theDisp, theCmap, &check_col);
else
xvAllocColor(theDisp, theCmap, &check_col);
screen_set[ci][i] =
(((unsigned short *)&check_col.red)[ci] >> 8) & 0xff;
XSetForeground(theDisp, check_gc, check_col.pixel);
XDrawPoint(theDisp, check_map, check_gc, 0, 0);
check_image = XGetImage(theDisp, check_map, 0, 0, 1, 1,
AllPlanes, ZPixmap);
if (check_image) {
switch (check_image->bits_per_pixel) {
case 8:
screen_rgb[ci][i] = *(CARD8 *)check_image->data;
break;
case 16:
screen_rgb[ci][i] = *(CARD16 *)check_image->data;
break;
case 24:
screen_rgb[ci][i] =
((unsigned long)*(CARD8 *)check_image->data << 16) |
((unsigned long)*(CARD8 *)(check_image->data + 1) << 8) |
(unsigned long)*(CARD8 *)(check_image->data + 2);
break;
case 32:
screen_rgb[ci][i] = *(CARD32 *)check_image->data;
break;
}
XDestroyImage(check_image);
}
}
}
XFreeGC(theDisp, check_gc);
XFreePixmap(theDisp, check_map);
}
/* The following switch should better be provided at runtime for
* comparison purposes.
* At the moment it's only compile time, unfortunately.
* Who can make adaptions for use as a runtime switch by a menu option?
*/
#define DO_FIXPIX_SMOOTH
#ifdef DO_FIXPIX_SMOOTH
/* The following code is based in part on:
*
* jquant1.c
*
* Copyright (C) 1991-1996, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains 1-pass color quantization (color mapping) routines.
* These routines provide mapping to a fixed color map using equally spaced
* color values. Optional Floyd-Steinberg or ordered dithering is available.
*/
/* Declarations for Floyd-Steinberg dithering.
*
* Errors are accumulated into the array fserrors[], at a resolution of
* 1/16th of a pixel count. The error at a given pixel is propagated
* to its not-yet-processed neighbors using the standard F-S fractions,
* ... (here) 7/16
* 3/16 5/16 1/16
* We work left-to-right on even rows, right-to-left on odd rows.
*
* We can get away with a single array (holding one row's worth of errors)
* by using it to store the current row's errors at pixel columns not yet
* processed, but the next row's errors at columns already processed. We
* need only a few extra variables to hold the errors immediately around the
* current column. (If we are lucky, those variables are in registers, but
* even if not, they're probably cheaper to access than array elements are.)
*
* We provide (#columns + 2) entries per component; the extra entry at each
* end saves us from special-casing the first and last pixels.
*/
typedef INT16 FSERROR; /* 16 bits should be enough */
typedef int LOCFSERROR; /* use 'int' for calculation temps */
typedef struct { byte *colorset;
FSERROR *fserrors;
} FSBUF;
/* Floyd-Steinberg initialization function.
*
* It is called 'fs2_init' since it's specialized for our purpose and
* could be embedded in a more general FS-package.
*
* Returns a malloced FSBUF pointer which has to be passed as first
* parameter to subsequent 'fs2_dither' calls.
* The FSBUF structure does not need to be referenced by the calling
* application, it can be treated from the app like a void pointer.
*
* The current implementation does only require to free() this returned
* pointer after processing.
*
* Returns NULL if malloc fails.
*
* NOTE: The FSBUF structure is designed to allow the 'fs2_dither'
* function to work with an *arbitrary* number of color components
* at runtime! This is an enhancement over the IJG code base :-).
* Only fs2_init() specifies the (maximum) number of components.
*/
static FSBUF *fs2_init(width)
int width;
{
FSBUF *fs;
FSERROR *p;
fs = (FSBUF *)
malloc(sizeof(FSBUF) * 3 + ((size_t)width + 2) * sizeof(FSERROR) * 3);
if (fs == 0) return fs;
fs[0].colorset = screen_set[0];
fs[1].colorset = screen_set[1];
fs[2].colorset = screen_set[2];
p = (FSERROR *)(fs + 3);
memset(p, 0, ((size_t)width + 2) * sizeof(FSERROR) * 3);
fs[0].fserrors = p;
fs[1].fserrors = p + 1;
fs[2].fserrors = p + 2;
return fs;
}
/* Floyd-Steinberg dithering function.
*
* NOTE:
* (1) The image data referenced by 'ptr' is *overwritten* (input *and*
* output) to allow more efficient implementation.
* (2) Alternate FS dithering is provided by the sign of 'nc'. Pass in
* a negative value for right-to-left processing. The return value
* provides the right-signed value for subsequent calls!
* (3) This particular implementation assumes *no* padding between lines!
* Adapt this if necessary.
*/
static int fs2_dither(fs, ptr, nc, num_rows, num_cols)
FSBUF *fs;
byte *ptr;
int nc, num_rows, num_cols;
{
int abs_nc, ci, row, col;
LOCFSERROR delta, cur, belowerr, bpreverr;
byte *dataptr, *colsetptr;
FSERROR *errorptr;
if ((abs_nc = nc) < 0) abs_nc = -abs_nc;
for (row = 0; row < num_rows; row++) {
for (ci = 0; ci < abs_nc; ci++, ptr++) {
dataptr = ptr;
colsetptr = fs[ci].colorset;
errorptr = fs[ci].fserrors;
if (nc < 0) {
dataptr += (num_cols - 1) * abs_nc;
errorptr += (num_cols + 1) * abs_nc;
}
cur = belowerr = bpreverr = 0;
for (col = 0; col < num_cols; col++) {
cur += errorptr[nc];
cur += 8; cur >>= 4;
if ((cur += *dataptr) < 0) cur = 0;
else if (cur > 255) cur = 255;
*dataptr = cur & 0xff;
cur -= colsetptr[cur];
delta = cur << 1; cur += delta;
bpreverr += cur; cur += delta;
belowerr += cur; cur += delta;
errorptr[0] = (FSERROR)bpreverr;
bpreverr = belowerr;
belowerr = delta >> 1;
dataptr += nc;
errorptr += nc;
}
errorptr[0] = (FSERROR)bpreverr;
}
ptr += (num_cols - 1) * abs_nc;
nc = -nc;
}
return nc;
}
#endif /* DO_FIXPIX_SMOOTH */
#define DO_CROP 0
#define DO_ZOOM 1
/***********************************/
void Resize(w,h)
int w,h;
{
RANGE(w,1,maxWIDE); RANGE(h,1,maxHIGH);
if (HaveSelection()) DrawSelection(0); /* turn off old rect */
if (psUp) PSResize(); /* if PSDialog is open, mention size change */
/* if same size, and Ximage created, do nothing */
if (w==eWIDE && h==eHIGH && theImage!=NULL) return;
if (DEBUG) fprintf(stderr,"Resize(%d,%d) eSIZE=%d,%d cSIZE=%d,%d\n",
w,h,eWIDE,eHIGH,cWIDE,cHIGH);
if (epicMode == EM_SMOOTH) { /* turn off smoothing */
epicMode = EM_RAW; SetEpicMode();
}
GenerateEpic(w,h);
CreateXImage();
}
/********************************************/
void GenerateCpic()
{
/* called when 'pic' has been modified (different contents, *not* different
size, orientation, etc. Rebuilds cpic. */
int i, j, bperpix;
byte *pp, *cp;
if (cpic == pic) return; /* no cropping, nothing to do */
cp = cpic;
bperpix = (picType == PIC8) ? 1 : 3;
for (i=0; i<cHIGH; i++) {
if ((i&63)==0) WaitCursor();
pp = pic + (i+cYOFF) * (pWIDE*bperpix) + (cXOFF * bperpix);
for (j=0; j<cWIDE*bperpix; j++)
*cp++ = *pp++;
}
}
/***********************************/
void GenerateEpic(w,h)
int w,h;
{
int cy,ex,ey,*cxarr, *cxarrp;
byte *clptr,*elptr,*epptr;
WaitCursor();
clptr = NULL; cxarrp = NULL; cy = 0; /* shut up compiler */
SetISTR(ISTR_EXPAND, "%.5g%% x %.5g%% (%d x %d)",
100.0 * ((float) w) / cWIDE,
100.0 * ((float) h) / cHIGH, w, h);
if (DEBUG)
fprintf(stderr,"GenerateEpic(%d,%d) eSIZE=%d,%d cSIZE=%d,%d epicode=%d\n",
w,h,eWIDE,eHIGH,cWIDE,cHIGH, epicMode);
FreeEpic(); /* get rid of the old one */
eWIDE = w; eHIGH = h;
if (epicMode == EM_SMOOTH) {
if (picType == PIC8) {
epic = SmoothResize(cpic, cWIDE, cHIGH, eWIDE, eHIGH,
rMap,gMap,bMap, rdisp,gdisp,bdisp, numcols);
}
else { /* PIC24 */
epic = Smooth24(cpic, 1, cWIDE, cHIGH, eWIDE, eHIGH, NULL, NULL, NULL);
}
if (epic) return; /* success */
else {
/* failed. Try to generate a *raw* image, at least... */
epicMode = EM_RAW; SetEpicMode();
/* fall through to rest of code */
}
}
/* generate a 'raw' epic, as we'll need it for ColorDither if EM_DITH */
if (eWIDE==cWIDE && eHIGH==cHIGH) { /* 1:1 expansion. point epic at cpic */
epic = cpic;
}
else {
/* run the rescaling algorithm */
int bperpix;
bperpix = (picType == PIC8) ? 1 : 3;
WaitCursor();
/* create a new epic of the appropriate size */
epic = (byte *) malloc((size_t) (eWIDE * eHIGH * bperpix));
if (!epic) FatalError("GenerateEpic(): unable to malloc 'epic'");
/* the scaling routine. not really all that scary after all... */
/* OPTIMIZATON: Malloc an eWIDE array of ints which will hold the
values of the equation px = (pWIDE * ex) / eWIDE. Faster than doing
a mul and a div for every point in picture */
cxarr = (int *) malloc(eWIDE * sizeof(int));
if (!cxarr) FatalError("unable to allocate cxarr");
for (ex=0; ex<eWIDE; ex++)
cxarr[ex] = bperpix * ((cWIDE * ex) / eWIDE);
elptr = epptr = epic;
for (ey=0; ey<eHIGH; ey++, elptr+=(eWIDE*bperpix)) {
ProgressMeter(0, (eHIGH)-1, ey, "Resize");
if ((ey&63) == 0) WaitCursor();
cy = (cHIGH * ey) / eHIGH;
epptr = elptr;
clptr = cpic + (cy * cWIDE * bperpix);
if (bperpix == 1) {
for (ex=0, cxarrp = cxarr; ex<eWIDE; ex++, epptr++)
*epptr = clptr[*cxarrp++];
}
else {
int j; byte *cp;
for (ex=0, cxarrp = cxarr; ex<eWIDE; ex++,cxarrp++) {
cp = clptr + *cxarrp;
for (j=0; j<bperpix; j++)
*epptr++ = *cp++;
}
}
}
free(cxarr);
}
/* at this point, we have a raw epic. Potentially dither it */
if (picType == PIC8 && epicMode == EM_DITH) {
byte *tmp;
tmp = DoColorDither(NULL, epic, eWIDE, eHIGH, rMap,gMap,bMap,
rdisp,gdisp,bdisp, numcols);
if (tmp) { /* success */
FreeEpic();
epic = tmp;
}
else { /* well... just use the raw image. */
epicMode = EM_RAW; SetEpicMode();
}
}
}
/***********************************/
void DoZoom(x,y,button)
int x, y;
unsigned int button;
{
if (button == Button1) do_zoom(x,y);
else if (button == Button2) do_pan(x,y);
else if (button == Button3) do_unzoom();
else XBell(theDisp,0);
}
/***********************************/
static void do_zoom(mx,my)
int mx,my;
{
int i;
int rx,ry,rx2,ry2, orx, ory, orw, orh;
int px,py,pw,ph,opx,opy,opw,oph,m;
Window rW, cW; unsigned int mask; int rtx, rty;
m = 0;
XSetFunction(theDisp, theGC, GXinvert);
XSetPlaneMask(theDisp, theGC, xorMasks[m]);
compute_zoom_rect(mx, my, &px, &py, &pw, &ph);
CoordP2E(px, py, &rx, &ry);
CoordP2E(px+pw, py+ph, &rx2,&ry2);
opx=px; opy=py; opw=pw; oph=ph;
orx = rx; ory = ry; orw = (rx2-rx); orh = (ry2-ry);
XDrawRectangle(theDisp,mainW,theGC,orx,ory, (u_int)orw, (u_int)orh);
/* track until Button1 is released. If ctrl is released, cancel */
while (1) {
if (!XQueryPointer(theDisp,mainW,&rW,&cW,&rtx,&rty,
&mx,&my,&mask)) continue;
if (!(mask & ControlMask)) break;
if (!(mask & Button1Mask)) break; /* button released */
compute_zoom_rect(mx, my, &px, &py, &pw, &ph);
if (px!=opx || py!=opy) {
XDrawRectangle(theDisp,mainW,theGC, orx,ory, (u_int)orw, (u_int)orh);
opx = px; opy = py; opw = pw; opy = py;
CoordP2E(opx, opy, &rx, &ry);
CoordP2E(opx+opw, opy+oph, &rx2,&ry2);
orx = rx; ory = ry; orw = (rx2-rx); orh = (ry2-ry);
XDrawRectangle(theDisp,mainW,theGC, orx,ory, (u_int)orw, (u_int)orh);
}
else {
XDrawRectangle(theDisp,mainW,theGC, orx,ory, (u_int)orw, (u_int)orh);
m = (m+1)&7;
XSetPlaneMask(theDisp, theGC, xorMasks[m]);
XDrawRectangle(theDisp,mainW,theGC, orx,ory, (u_int)orw, (u_int)orh);
XFlush(theDisp);
Timer(100);
}
}
if (!(mask & ControlMask)) { /* cancelled */
XDrawRectangle(theDisp, mainW, theGC, orx, ory, (u_int) orw, (u_int) orh);
XSetFunction(theDisp, theGC, GXcopy);
XSetPlaneMask(theDisp, theGC, AllPlanes);
return;
}
for (i=0; i<4; i++) {
XDrawRectangle(theDisp, mainW, theGC, orx, ory, (u_int) orw, (u_int) orh);
XFlush(theDisp);
Timer(100);
}
XSetFunction(theDisp, theGC, GXcopy);
XSetPlaneMask(theDisp, theGC, AllPlanes);
/* if rectangle is *completely* outside epic, don't zoom */
if (orx+orw<0 || ory+orh<0 || orx>=eWIDE || ory>=eHIGH) return;
crop1(opx, opy, opw, oph, DO_ZOOM);
}
/***********************************/
static void compute_zoom_rect(x, y, px, py, pw, ph)
int x, y, *px, *py, *pw, *ph;
{
/* given a mouse pos (in epic coords), return x,y,w,h PIC coords for
a 'zoom in by 2x' rectangle to be tracked. The rectangle stays
completely within 'pic' boundaries, and moves in 'pic' increments */
CoordE2P(x, y, px, py);
*pw = (cWIDE+1)/2;
*ph = (cHIGH+1)/2;
*px = *px - (*pw)/2;
*py = *py - (*ph)/2;
RANGE(*px, 0, pWIDE - *pw);
RANGE(*py, 0, pHIGH - *ph);
}
/***********************************/
static void do_unzoom()
{
int x,y,w,h, x2,y2, ex,ey,ew,eh;
/* compute a cropping rectangle (in pic coordinates) that's twice
the size of eWIDE,eHIGH, centered around eWIDE/2, eHIGH/2, but no
larger than pWIDE,PHIGH */
if (!but[BUNCROP].active) { /* not cropped, can't zoom out */
XBell(theDisp, 0);
return;
}
ex = -eWIDE/2; ey = -eHIGH/2;
ew = eWIDE*2; eh = eHIGH*2;
CoordE2P(ex, ey, &x, &y);
CoordE2P(ex+ew, ey+eh, &x2, &y2);
w = x2 - x; h = y2 - y;
RANGE(w, 1, pWIDE);
RANGE(h, 1, pHIGH);
if (x<0) x = 0;
if (y<0) y = 0;
if (x+w > pWIDE) x = pWIDE - w;
if (y+h > pHIGH) y = pHIGH - h;
crop1(x,y,w,h, DO_ZOOM);
}
/***********************************/
static void do_pan(mx,my)
int mx,my;
{
int i, ox,oy,offx,offy, rw,rh, px, py, dx, dy,m;
Window rW, cW; unsigned int mask; int rx, ry;
offx = ox = mx;
offy = oy = my;
rw = eWIDE-1; rh = eHIGH-1;
m = 0;
XSetFunction(theDisp, theGC, GXinvert);
XSetPlaneMask(theDisp, theGC, xorMasks[m]);
XDrawRectangle(theDisp,mainW,theGC, mx-offx, my-offy, (u_int)rw, (u_int)rh);
/* track until Button2 is released */
while (1) {
if (!XQueryPointer(theDisp, mainW, &rW, &cW, &rx, &ry,
&mx, &my, &mask)) continue;
if (!(mask & ControlMask)) break; /* cancelled */
if (!(mask & Button2Mask)) break; /* button released */
if (mask & ShiftMask) { /* constrain mx,my to horiz or vertical */
if (abs(mx-offx) > abs(my-offy)) my = offy;
else mx = offx;
}
do_pan_calc(offx, offy, &mx, &my);
if (mx!=ox || my!=oy) {
XDrawRectangle(theDisp, mainW, theGC, ox-offx, oy-offy,
(u_int) rw, (u_int) rh);
XDrawRectangle(theDisp, mainW, theGC, mx-offx, my-offy,
(u_int) rw, (u_int) rh);
ox = mx; oy = my;
}
else {
XDrawRectangle(theDisp, mainW, theGC, ox-offx, oy-offy,
(u_int) rw, (u_int) rh);
m = (m+1)&7;
XSetPlaneMask(theDisp, theGC, xorMasks[m]);
XDrawRectangle(theDisp, mainW, theGC, ox-offx, oy-offy,
(u_int) rw, (u_int) rh);
XFlush(theDisp);
Timer(100);
}
}
mx = ox; my = oy; /* in case mx,my changed on button release */
if (!(mask & ControlMask)) { /* cancelled */
XDrawRectangle(theDisp, mainW, theGC, mx-offx, my-offy,
(u_int) rw, (u_int) rh);
XSetFunction(theDisp, theGC, GXcopy);
XSetPlaneMask(theDisp, theGC, AllPlanes);
return;
}
for (i=0; i<4; i++) {
XDrawRectangle(theDisp, mainW, theGC, mx-offx, my-offy,
(u_int) rw, (u_int) rh);
XFlush(theDisp);
Timer(100);
}
/* mx-offx, my-offy is top-left corner of pan rect, in epic coords */
CoordE2P(mx-offx, my-offy, &px, &py);
dx = px - cXOFF; dy = py - cYOFF;
if (dx==0 && dy==0) { /* didn't pan anywhere */
XDrawRectangle(theDisp, mainW, theGC, mx-offx, my-offy,
(u_int) rw, (u_int) rh);
XSetFunction(theDisp, theGC, GXcopy);
XSetPlaneMask(theDisp, theGC, AllPlanes);
return;
}
XSetFunction(theDisp, theGC, GXcopy);
XSetPlaneMask(theDisp, theGC, AllPlanes);
crop1(cXOFF-dx, cYOFF-dy, cWIDE, cHIGH, DO_ZOOM);
}
/***********************************/
static void do_pan_calc(offx, offy, xp,yp)
int offx, offy, *xp, *yp;
{
/* given mouse coords (in xp,yp) and original offset, compute 'clipped'
coords (returned in xp,yp) such that the 'pan window' remains entirely
within the image boundaries */
int mx, my, eprx, epry, eprw, eprh, pprx, ppry, pprw, pprh;
mx = *xp; my = *yp;
/* compute corners of pan rect in eWIDE,eHIGH coords */
eprx = offx - mx;
epry = offy - my;
eprw = eWIDE;
eprh = eHIGH;
/* compute corners of pan rect in pWIDE,pHIGH coords */
CoordE2P(eprx, epry, &pprx, &ppry);
pprw = cWIDE;
pprh = cHIGH;
/* if pan rect (in p* coords) is outside bounds of pic, move it inside */
if (pprx<0) pprx = 0;
if (ppry<0) ppry = 0;
if (pprx + pprw > pWIDE) pprx = pWIDE-pprw;
if (ppry + pprh > pHIGH) ppry = pHIGH-pprh;
/* convert clipped pan rect back into eWIDE,eHIGH coords */
CoordP2E(pprx, ppry, &eprx, &epry);
*xp = offx - eprx;
*yp = offy - epry;
}
/***********************************/
void Crop()
{
int x, y, w, h;
if (!HaveSelection()) return;
GetSelRCoords(&x,&y,&w,&h);
EnableSelection(0);
crop1(x,y,w,h,DO_CROP);
}
/**********************************/
static void crop1(x,y,w,h,zm)
int x,y,w,h,zm;
{
int oldew,oldeh,oldcx,oldcy;
oldcx = cXOFF; oldcy = cYOFF;
oldew = eWIDE; oldeh = eHIGH;
DoCrop(x,y,w,h);
if (zm == DO_ZOOM) { eWIDE = oldew; eHIGH = oldeh; }
GenerateEpic(eWIDE, eHIGH);
if (useroot) DrawEpic();
else {
if (zm == DO_CROP) {
WCrop(eWIDE, eHIGH, cXOFF-oldcx, cYOFF-oldcy); /* shrink window */
CreateXImage();
}
else DrawEpic();
}
SetCursors(-1);
}
/***********************************/
void UnCrop()
{
int w,h;
if (cpic == pic) return; /* not cropped */
BTSetActive(&but[BUNCROP],0);
if (epicMode == EM_SMOOTH) { /* turn off smoothing */
epicMode = EM_RAW; SetEpicMode();
}
/* dispose of old cpic and epic */
FreeEpic();
if (cpic && cpic != pic) free(cpic);
cpic = NULL;
w = (pWIDE * eWIDE) / cWIDE; h = (pHIGH * eHIGH) / cHIGH;
if (w>maxWIDE || h>maxHIGH) {
/* return to 'normal' size */
if (pWIDE>maxWIDE || pHIGH>maxHIGH) {
double r,wr,hr;
wr = ((double) pWIDE) / maxWIDE;
hr = ((double) pHIGH) / maxHIGH;
r = (wr>hr) ? wr : hr; /* r is the max(wr,hr) */
w = (int) ((pWIDE / r) + 0.5);
h = (int) ((pHIGH / r) + 0.5);
}
else { w = pWIDE; h = pHIGH; }
}
cpic = pic; cXOFF = cYOFF = 0; cWIDE = pWIDE; cHIGH = pHIGH;
/* generate an appropriate 'epic' */
GenerateEpic(w,h);
CreateXImage();
WUnCrop();
SetCropString();
}
/***********************************/
void AutoCrop()
{
/* called when AutoCrop button is pressed */
int oldcx, oldcy;
oldcx = cXOFF; oldcy = cYOFF;
if (DoAutoCrop()) {
if (useroot) DrawEpic();
else {
CreateXImage();
WCrop(eWIDE, eHIGH, cXOFF-oldcx, cYOFF-oldcy);
}
}
SetCursors(-1);
}
/***********************************/
int DoAutoCrop()
{
/* returns '1' if any cropping was actually done. */
byte *cp, *cp1;
int i, ctop, cbot, cleft, cright;
byte bgcol;
ctop = cbot = cleft = cright = 0;
if (picType == PIC24) return( doAutoCrop24() );
/* crop the top */
cp = cpic;
bgcol = cp[0];
while (ctop+1 < cHIGH) {
/* see if we can delete this line */
for (i=0, cp1=cp; i<cWIDE && *cp1==bgcol; i++, cp1++);
if (i==cWIDE) { cp += cWIDE; ctop++; }
else break;
}
/* crop the bottom */
cp = cpic + (cHIGH-1) * cWIDE;
bgcol = cp[0];
while (ctop + cbot + 1 < cHIGH) {
/* see if we can delete this line */
for (i=0, cp1=cp; i<cWIDE && *cp1==bgcol; i++,cp1++);
if (i==cWIDE) { cp -= cWIDE; cbot++; }
else break;
}
/* crop the left side */
cp = cpic;
bgcol = cp[0];
while (cleft + 1 < cWIDE) {
/* see if we can delete this line */
for (i=0, cp1=cp; i<cHIGH && *cp1==bgcol; i++, cp1 += cWIDE);
if (i==cHIGH) { cp++; cleft++; }
else break;
}
/* crop the right side */
cp = cpic + cWIDE-1;
bgcol = cp[0];
while (cleft + cright + 1 < cWIDE) {
/* see if we can delete this line */
for (i=0, cp1=cp; i<cHIGH && *cp1==bgcol; i++, cp1 += cWIDE);
if (i==cHIGH) { cp--; cright++; }
else break;
}
/* do the actual cropping */
if (cleft || ctop || cbot || cright) {
DoCrop(cXOFF+cleft, cYOFF+ctop,
cWIDE-(cleft+cright), cHIGH-(ctop+cbot));
return 1;
}
return 0;
}
/***********************************/
static int doAutoCrop24()
{
/* returns '1' if any cropping was actually done */
byte *cp, *cp1;
int i, ctop, cbot, cleft, cright;
byte bgR, bgG, bgB;
int maxmiss, misses, half;
int r, g, b, R, G, B, oldr, oldg, oldb;
# define EPSILON 39 /* up to 15% (39/256ths) variance okay */
# define NEIGHBOR 16 /* within 6% of neighboring pixels */
# define MISSPCT 6 /* and up to 6% that don't match */
# define inabsrange(a,n) ( (a) < n && (a) > -n )
if (cHIGH<3 || cWIDE<3) return 0;
ctop = cbot = cleft = cright = 0;
if (picType != PIC24) FatalError("doAutoCrop24 called when pic!=PIC24");
/* crop the top */
cp = cpic;
half = cWIDE/2 * 3;
maxmiss = cWIDE * MISSPCT / 100;
bgR = cp[half+0]; bgG = cp[half+1]; bgB = cp[half+2];
while (ctop+1 < cHIGH) { /* see if we can delete this line */
oldr = bgR; oldg = bgG; oldb = bgB;
for (i=0, misses=0, cp1=cp; i<cWIDE && misses<maxmiss; i++, cp1+=3) {
r=cp1[0]-bgR; g=cp1[1]-bgG; b=cp1[2]-bgB;
R=cp1[0]-oldr; G=cp1[1]-oldg; B=cp1[2]-oldb;
if (!inabsrange(r-g, EPSILON) ||
!inabsrange(r-b, EPSILON) ||
!inabsrange(b-g, EPSILON) ||
!inabsrange(R-G, NEIGHBOR) ||
!inabsrange(R-B, NEIGHBOR) ||
!inabsrange(B-G, NEIGHBOR)) misses++;
oldr=r; oldg=g; oldb=b;
}
if (i==cWIDE) { cp += cWIDE*3; ctop++; } /* OK, we can crop this line */
else break;
}
/* crop the bottom */
cp = cpic + (cHIGH-1) * cWIDE*3;
bgR = cp[half+0]; bgG = cp[half+1]; bgB = cp[half+2];
while (ctop + cbot + 1 < cHIGH) { /* see if we can delete this line */
oldr = bgR; oldg = bgG; oldb = bgB;
for (i=0, misses=0, cp1=cp; i<cWIDE && misses<maxmiss; i++, cp1+=3) {
r=cp1[0]-bgR; g=cp1[1]-bgG; b=cp1[2]-bgB;
R=cp1[0]-oldr; G=cp1[1]-oldg; B=cp1[2]-oldb;
if (!inabsrange(r-g, EPSILON) ||
!inabsrange(r-b, EPSILON) ||
!inabsrange(b-g, EPSILON) ||
!inabsrange(R-G, NEIGHBOR) ||
!inabsrange(R-B, NEIGHBOR) ||
!inabsrange(B-G, NEIGHBOR)) misses++;
}
if (i==cWIDE) { cp -= cWIDE*3; cbot++; }
else break;
}
/* crop the left side */
cp = cpic;
half = (cHIGH/2) * cWIDE * 3;
maxmiss = cHIGH * MISSPCT / 100;
bgR = cp[half+0]; bgG = cp[half+1]; bgB = cp[half+2];
while (cleft + 1 < cWIDE) { /* see if we can delete this line */