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xvgrab.c
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xvgrab.c
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/*
* xvgrab.c - image grabbing (from the display) functions for XV
*
* Author: John Bradley, University of Pennsylvania
*
* Contains:
* int Grab() - handles the GRAB command
* int LoadGrab(); - 'loads' the pic from the last succesful Grab
*
*/
#include "copyright.h"
#define NEEDSTIME
#include "xv.h"
union swapun {
CARD32 l;
CARD16 s;
CARD8 b[sizeof(CARD32)];
};
struct rectlist {
int x,y,w,h;
struct rectlist *next;
};
static byte *grabPic = (byte *) NULL;
static int gptype;
static byte grabmapR[256], grabmapG[256], grabmapB[256];
static int gXOFF, gYOFF, gWIDE,gHIGH;
static int grabInProgress=0;
static int hidewins = 0;
static GC rootGC;
static struct rectlist *regrabList;
static void flashrect PARM((int, int, int, int, int));
static void startflash PARM((void));
static void endflash PARM((void));
static void ungrabX PARM((void));
static int lowbitnum PARM((unsigned long));
static int getxcolors PARM((XWindowAttributes *, XColor **));
static void printWinTree PARM((Window, int));
static void errSpace PARM((int));
static int grabRootRegion PARM((int, int, int, int));
static int grabWinImage PARM((Window, VisualID, Colormap, int));
static int convertImageAndStuff PARM((XImage *, XColor *, int,
XWindowAttributes *,
int,int,int,int));
static int RectIntersect PARM((int,int,int,int, int,int,int,int));
static int CountColors24 PARM((byte *, int, int,
int, int, int, int));
static int Trivial24to8 PARM((byte *, int, int, byte *,
byte *, byte *, byte *, int));
/***********************************/
int Grab()
{
/* does UI part of Grab command. returns '1' if a new image was grabbed,
0 if cancelled */
int i, x, y, x1, y1, x2, y2, ix, iy, iw, ih, rv;
int rx, ry, pretendGotB1, autograb;
Window rW, cW, clickWin;
unsigned int mask;
XColor fc, bc;
pretendGotB1 = 0;
if (grabInProgress) return 0; /* avoid recursive grabs during delay */
/* do the dialog box thing */
i = GrabPopUp(&hidewins, &grabDelay);
if (i==2) return 0; /* cancelled */
autograb = (i==1);
if (hidewins) { /* unmap all XV windows */
autoclose += 2; /* force it on once */
if (mainW && dispMode==RMB_WINDOW) XUnmapWindow(theDisp, mainW);
else if (ctrlW) CtrlBox(0);
}
XSync(theDisp, False);
if (grabDelay>0) { /* instead of sleep(), handle events while waiting */
time_t startT, t;
int done;
grabInProgress = 1; /* guard against recursive grabs during delay */
time(&startT);
while (1) {
time(&t);
if (t >= startT + grabDelay) break;
if (XPending(theDisp)>0) {
XEvent evt;
XNextEvent(theDisp, &evt);
i = HandleEvent(&evt, &done);
if (done) { /* only 'new image' cmd accepted=quit */
if (i==QUIT) Quit(0);
else XBell(theDisp, 0);
}
}
Timer(100);
}
grabInProgress = 0;
}
rootGC = DefaultGC(theDisp, theScreen);
if (grabPic) { /* throw away previous 'grabbed' pic, if there is one */
free(grabPic); grabPic = (byte *) NULL;
}
fc.flags = bc.flags = DoRed | DoGreen | DoBlue;
fc.red = fc.green = fc.blue = 0xffff;
bc.red = bc.green = bc.blue = 0x0000;
XRecolorCursor(theDisp, tcross, &fc, &bc);
XBell(theDisp, 0); /* beep once at start of grab */
if (!autograb) XGrabButton(theDisp, (u_int) AnyButton, 0, rootW, False, 0,
GrabModeAsync, GrabModeSync, None, tcross);
if (autograb) {
XGrabServer(theDisp); /* until we've done the grabImage */
if (!XQueryPointer(theDisp,rootW,&rW,&cW,&rx,&ry,&x1,&y1,&mask)) {
fprintf(stderr, "xv: XQueryPointer failed!\n");
XUngrabServer(theDisp);
rv = 0;
goto exit;
}
else { pretendGotB1 = 1; mask = Button1Mask; }
}
else { /* !autograb */
/* wait for a button press */
while (1) {
XEvent evt; int done;
/* recolor cursor to indicate that grabbing is active? */
if (XQueryPointer(theDisp,rootW,&rW,&cW,&rx,&ry,&x1,&y1,&mask)) {
if (mask & (Button1Mask | Button2Mask | Button3Mask)) break;
}
/* continue to handle events while waiting... */
XNextEvent(theDisp, &evt);
i = HandleEvent(&evt, &done);
if (done) { /* only 'new image' cmd accepted=quit */
if (i==QUIT) {
XUngrabButton(theDisp, (u_int) AnyButton, 0, rootW);
Quit(0);
}
else XBell(theDisp, 0);
}
}
}
/***
*** got button click (or pretending we did, if autograb)
***/
if (mask & Button3Mask || rW!=rootW) { /* Button3: CANCEL GRAB */
while (1) { /* wait for button to be released */
if (XQueryPointer(theDisp,rootW,&rW,&cW,&rx,&ry,&x1,&y1,&mask)) {
if (!(mask & Button3Mask)) break;
}
}
XUngrabButton(theDisp, (u_int) AnyButton, 0, rootW);
XBell(theDisp, 0);
XBell(theDisp, 0);
rv = 0;
goto exit;
}
if (mask & Button1Mask) { /* Button1: GRAB WINDOW (& FRAME, maybe) */
while (!pretendGotB1) { /* wait for button to be released, if clicked */
int rx,ry,x1,y1; Window rW, cW;
if (XQueryPointer(theDisp,rootW,&rW,&cW,&rx,&ry,&x1,&y1,&mask)) {
if (!(mask & Button1Mask)) break;
}
}
clickWin = (cW) ? cW : rootW;
if (clickWin == rootW) { /* grab entire screen */
if (DEBUG) fprintf(stderr,"Grab: clicked on root window.\n");
ix = iy = 0; iw = dispWIDE; ih = dispHIGH;
}
else {
int x,y; Window win; unsigned int rw,rh,rb,rd;
if (XGetGeometry(theDisp,clickWin,&rW, &x, &y, &rw, &rh, &rb, &rd)) {
iw = (int) rw; ih = (int) rh;
XTranslateCoordinates(theDisp, clickWin, rootW, 0, 0, &ix,&iy, &win);
if (DEBUG) fprintf(stderr,"clickWin=0x%x: %d,%d %dx%d depth=%ud\n",
(u_int) clickWin, ix, iy, iw, ih, rd);
}
else {
ix = iy = 0; iw = dispWIDE; ih = dispHIGH; clickWin = rootW;
if (DEBUG) fprintf(stderr,"XGetGeometry failed? (using root win)\n");
}
}
/* range checking: keep rectangle fully on-screen */
if (ix<0) { iw += ix; ix = 0; }
if (iy<0) { ih += iy; iy = 0; }
if (ix+iw>dispWIDE) iw = dispWIDE-ix;
if (iy+ih>dispHIGH) ih = dispHIGH-iy;
if (DEBUG) fprintf(stderr,"using %d,%d (%dx%d)\n", ix, iy, iw, ih);
/* flash the rectangle a bit... */
startflash();
for (i=0; i<5; i++) {
flashrect(ix, iy, iw, ih, 1);
XFlush(theDisp); Timer(100);
flashrect(ix, iy, iw, ih, 0);
XFlush(theDisp); Timer(100);
}
endflash();
}
else { /* Button2: TRACK A RECTANGLE */
int origrx, origry;
Window origcW;
clickWin = rootW;
origrx = ix = x2 = rx;
origry = iy = y2 = ry;
iw = ih = 0;
XGrabServer(theDisp);
startflash();
/* Wait for button release while tracking rectangle on screen */
while (1) {
if (XQueryPointer(theDisp,rootW,&rW,&cW,&rx,&ry,&x,&y,&mask)) {
if (!(mask & Button2Mask)) break;
}
flashrect(ix, iy, iw, ih, 0); /* turn off rect */
if (rx!=x2 || ry!=y2) { /* resize rectangle */
ix = (x1<rx) ? x1 : rx;
iy = (y1<ry) ? y1 : ry;
iw = abs(rx - x1); ih = abs(ry - y1);
x2 = rx; y2 = ry;
}
if (iw>1 && ih>1) flashrect(ix,iy,iw,ih,1); /* turn on rect */
}
flashrect(ix, iy, iw, ih, 0); /* turn off rect */
/* flash the rectangle a bit... */
for (i=0; i<5; i++) {
flashrect(ix, iy, iw, ih, 1);
XFlush(theDisp); Timer(100);
flashrect(ix, iy, iw, ih, 0);
XFlush(theDisp); Timer(100);
}
endflash();
XUngrabServer(theDisp);
}
/***
*** grab screen area (ix,iy,iw,ih)
***/
if (DEBUG>1) printWinTree(clickWin, 0);
WaitCursor();
if (!autograb) XGrabServer(theDisp); /* until we've done the grabImage */
rv = grabRootRegion(ix, iy, iw, ih); /* ungrabs the server & button */
SetCursors(-1);
exit:
if (hidewins) { /* remap XV windows */
autoclose += 2; /* force it on once */
if (mainW && dispMode == RMB_WINDOW) {
int state;
XMapRaised(theDisp, mainW);
XSync(theDisp, False); /* get that damned window on screen */
if (DEBUG) fprintf(stderr,"==remapped mainW. waiting for Config.\n");
/* sit here until we see a MapNotify on mainW followed by a
ConfigureNotify on mainW */
state = 0;
while (state != 3) {
XEvent event;
XNextEvent(theDisp, &event);
HandleEvent(&event, &i);
if (!(state&1) && event.type == MapNotify &&
event.xmap.window == mainW) state |= 1;
if (!(state&2) && event.type == ConfigureNotify &&
event.xconfigure.window == mainW) state |= 2;
}
if (DEBUG) fprintf(stderr,"==after remapping mainW, GOT Config.\n");
}
else if (ctrlW) CtrlBox(1);
}
return rv;
}
/***********************************/
int LoadGrab(pinfo)
PICINFO *pinfo;
{
/* loads up (into XV structures) last image successfully grabbed.
returns '0' on failure, '1' on success */
int i;
if (!grabPic) return 0; /* no image to use */
pinfo->type = gptype;
if (pinfo->type == PIC8) {
for (i=0; i<256; i++) {
pinfo->r[i] = grabmapR[i];
pinfo->g[i] = grabmapG[i];
pinfo->b[i] = grabmapB[i];
}
}
pinfo->pic = grabPic;
pinfo->normw = pinfo->w = gWIDE;
pinfo->normh = pinfo->h = gHIGH;
pinfo->frmType = -1;
pinfo->colType = -1;
sprintf(pinfo->fullInfo,"<%s internal>",
(pinfo->type == PIC8) ? "8-bit" : "24-bit");
sprintf(pinfo->shrtInfo,"%dx%d image.",gWIDE, gHIGH);
pinfo->comment = (char *) NULL;
grabPic = (byte *) NULL;
return 1;
}
/***********************************/
static void flashrect(x,y,w,h,show)
int x,y,w,h,show;
{
static int isvis = 0;
static int maskno = 0;
XSetPlaneMask(theDisp, rootGC, xorMasks[maskno]);
if (!show) { /* turn off rectangle */
if (isvis)
XDrawRectangle(theDisp, rootW, rootGC, x, y, (u_int) w-1, (u_int) h-1);
isvis = 0;
}
else { /* show rectangle */
if (!isvis && w>1 && h>1) {
maskno = (maskno + 1) & 7;
XSetPlaneMask(theDisp, rootGC, xorMasks[maskno]);
XDrawRectangle(theDisp, rootW, rootGC, x, y, (u_int) w-1, (u_int) h-1);
isvis = 1;
}
}
}
/***********************************/
static void startflash()
{
/* set up for drawing a flashing rectangle */
XSetFunction(theDisp, rootGC, GXinvert);
XSetSubwindowMode(theDisp, rootGC, IncludeInferiors);
}
/***********************************/
static void endflash()
{
XSetFunction(theDisp, rootGC, GXcopy);
XSetSubwindowMode(theDisp, rootGC, ClipByChildren);
XSetPlaneMask(theDisp, rootGC, AllPlanes);
XSync(theDisp, False);
}
/***********************************/
static void ungrabX()
{
XUngrabServer(theDisp);
XUngrabButton(theDisp, (u_int) AnyButton, 0, rootW);
}
/**************************************/
static int lowbitnum(ul)
unsigned long ul;
{
/* returns position of lowest set bit in 'ul' as an integer (0-31),
or -1 if none */
int i;
for (i=0; ((ul&1) == 0) && i<32; i++, ul>>=1);
if (i==32) i = -1;
return i;
}
/**********************************************/
/* getxcolors() function snarfed from 'xwd.c' */
/**********************************************/
#define lowbit(x) ((x) & (~(x) + 1))
static int getxcolors(win_info, colors)
XWindowAttributes *win_info;
XColor **colors;
{
int i, ncolors;
Colormap cmap;
*colors = (XColor *) NULL;
if (win_info->visual->class == TrueColor) {
if (DEBUG>1) fprintf(stderr,"TrueColor visual: no colormap needed\n");
return 0;
}
else if (!win_info->colormap) {
if (DEBUG>1) fprintf(stderr,"no colormap associated with window\n");
return 0;
}
ncolors = win_info->visual->map_entries;
if (DEBUG>1) fprintf(stderr,"%d entries in colormap\n", ncolors);
if (!(*colors = (XColor *) malloc (sizeof(XColor) * ncolors)))
FatalError("malloc failed in getxcolors()");
if (win_info->visual->class == DirectColor) {
Pixel red, green, blue, red1, green1, blue1;
if (DEBUG>1) fprintf(stderr,"DirectColor visual\n");
red = green = blue = 0;
red1 = lowbit(win_info->visual->red_mask);
green1 = lowbit(win_info->visual->green_mask);
blue1 = lowbit(win_info->visual->blue_mask);
for (i=0; i<ncolors; i++) {
(*colors)[i].pixel = red|green|blue;
(*colors)[i].pad = 0;
red += red1;
if (red > win_info->visual->red_mask) red = 0;
green += green1;
if (green > win_info->visual->green_mask) green = 0;
blue += blue1;
if (blue > win_info->visual->blue_mask) blue = 0;
}
}
else {
for (i=0; i<ncolors; i++) {
(*colors)[i].pixel = i;
(*colors)[i].pad = 0;
}
}
XQueryColors(theDisp, win_info->colormap, *colors, ncolors);
return(ncolors);
}
/*******************************************/
static void printWinTree(win,tab)
Window win;
int tab;
{
u_int i, nchildren;
Window root, parent, *children, chwin;
XWindowAttributes xwa;
int xr, yr;
if (!XGetWindowAttributes(theDisp, win, &xwa)) {
errSpace(tab);
fprintf(stderr,"pWT: can't XGetWindowAttributes(%08x)\n", (u_int) win);
return;
}
XTranslateCoordinates(theDisp, win, rootW, 0,0, &xr,&yr, &chwin);
if (xwa.map_state==IsViewable) {
errSpace(tab);
fprintf(stderr,"%08x: %4d,%4d %4dx%4d vis: %02x cm=%x %s\n",
(u_int) win, xr,yr, xwa.width, xwa.height,
(u_int) XVisualIDFromVisual(xwa.visual),
(u_int) xwa.colormap,
((xwa.map_state==IsUnmapped) ? "unmapped " :
(xwa.map_state==IsUnviewable) ? "unviewable" :
(xwa.map_state==IsViewable) ? "viewable " :
"<unknown> ") );
if (!XQueryTree(theDisp, win, &root, &parent, &children, &nchildren)) {
errSpace(tab);
fprintf(stderr,"pWT: XQueryTree(%08x) failed\n", (u_int) win);
if (children) XFree((char *)children);
return;
}
for (i=0; i<nchildren; i++) printWinTree(children[i], tab+1);
if (children) XFree((char *)children);
}
return;
}
/***********************************/
static void errSpace(n)
int n;
{
for ( ; n>0; n--) putc(' ', stderr);
}
/***********************************/
static int grabRootRegion(x, y, w, h)
int x, y, w, h;
{
/* attempts to grab the specified rectangle of the root window
returns '1' on success */
XImage *image;
XWindowAttributes xwa;
XColor *colors;
int ncolors, i, ix, iy;
char str[256];
Window win;
regrabList = (struct rectlist *) NULL;
/* range checking */
if (x<0) { w += x; x = 0; }
if (y<0) { h += y; y = 0; }
if (x+w>dispWIDE) w = dispWIDE-x;
if (y+h>dispHIGH) h = dispHIGH-y;
if (w<=0 || h<=0) { /* selected nothing */
ungrabX();
return 0;
}
/* grab this region, using the default (root's) visual */
/* now for all top-level windows (children of root), in bottom->top order
if they intersect the grabregion
are they drawn entirely (including children) using default visual+cmap?
yes: if they intersect 'regrab' list, grab'em - else skip'em
no: grab them, add their rectangle to 'regrab' list
*/
/* make a 24bit grabPic */
gptype = PIC24;
gXOFF = x; gYOFF = y; gWIDE = w; gHIGH = h;
grabPic = (byte *) malloc((size_t) gWIDE * gHIGH * 3);
if (!grabPic) {
ungrabX();
ErrPopUp("Unable to malloc() space for grabbed image!", "\nBite Me!");
return 0;
}
if (!XGetWindowAttributes(theDisp, rootW, &xwa)) {
ungrabX();
ErrPopUp("Can't get window attributes for root window!", "\nBite Me!");
return 0;
}
i = grabWinImage(rootW, XVisualIDFromVisual(xwa.visual), xwa.colormap,0);
ungrabX();
XBell(theDisp, 0); /* beep twice at end of grab */
XBell(theDisp, 0);
{ /* free regrabList */
struct rectlist *rr, *tmprr;
rr = regrabList;
while (rr) {
tmprr = rr->next;
free((char *) rr);
rr = tmprr;
}
regrabList = (struct rectlist *) NULL;
}
if (i) {
ErrPopUp("Warning: Problems occurred during grab.","\nWYSInWYG!");
return 0;
}
/* if 256 or fewer colors in grabPic, make it a PIC8 */
i = CountColors24(grabPic, gWIDE, gHIGH, 0,0,gWIDE,gHIGH);
if (i<=256) {
byte *pic8;
pic8 = (byte *) malloc((size_t) (gWIDE * gHIGH));
if (pic8) {
if (Trivial24to8(grabPic, gWIDE,gHIGH, pic8,
grabmapR,grabmapG,grabmapB,256)) {
free((char *) grabPic);
grabPic = pic8;
gptype = PIC8;
}
}
}
return 1; /* full success */
}
/***********************************/
static int grabWinImage(win, parentVid, parentCmap, toplevel)
Window win;
VisualID parentVid;
Colormap parentCmap;
int toplevel;
{
/* grabs area of window (and its children) that intersects
* grab region (root coords: gXOFF,gYOFF,gWIDE,gHIGH), and stuffs
* relevant bits into the grabPic (a gWIDE*gHIGH PIC24)
*
* Note: special kludge for toplevel windows (children of root):
* since that's the only case where a window can be obscuring something
* that isn't its parent
*
* returns 0 if okay, 1 if problems occurred
*/
int i, rv, dograb;
int wx, wy, ww, wh; /* root coords of window */
int gx, gy, gw, gh; /* root coords of grab region of win*/
Window chwin; /* unused */
u_int nchildren;
Window root, parent, *children;
XWindowAttributes xwa;
int xr, yr;
/* first, quick checks to avoid recursing down useless branches */
if (!XGetWindowAttributes(theDisp, win, &xwa)) {
if (DEBUG) fprintf(stderr,"gWI: can't get win attr (%08x)\n", (u_int) win);
return 1;
}
if (xwa.class == InputOnly || xwa.map_state != IsViewable) return 0;
rv = 0;
dograb = 1;
wx = 0; wy = 0; ww = (int) xwa.width; wh = (int) xwa.height;
/* if this window doesn't intersect, none of its children will, either */
XTranslateCoordinates(theDisp, win, rootW, 0,0, &wx, &wy, &chwin);
if (!RectIntersect(wx,wy,ww,wh, gXOFF,gYOFF,gWIDE,gHIGH)) return 0;
gx = wx; gy = wy; gw = ww; gh = wh;
CropRect2Rect(&gx,&gy,&gw,&gh, gXOFF,gYOFF,gWIDE,gHIGH);
if (win==rootW) {
/* always grab */
}
else if (XVisualIDFromVisual(xwa.visual) == parentVid &&
((xwa.visual->class==TrueColor) || xwa.colormap == parentCmap)) {
/* note: if both visuals are TrueColor, don't compare cmaps */
/* normally, if the vis/cmap info of a window is the same as its parent,
no need to regrab window. special case if this is a toplevel
window, as it can be obscuring windows that *aren't* its parent */
if (toplevel) {
/* we probably already have this region. Check it against regrabList
If it intersects none, no need to grab.
If it intersects one, crop to that rectangle and grab
if it intersects >1, don't crop, just grab gx,gy,gw,gh */
struct rectlist *rr, *cr;
i=0; cr=rr=regrabList;
while (rr) {
if (RectIntersect(gx,gy,gw,gh, rr->x,rr->y,rr->w,rr->h)) {
i++; cr = rr;
}
rr = rr->next;
}
if (i==0) dograb=0; /* no need to grab */
if (i==1) CropRect2Rect(&gx,&gy,&gw,&gh, cr->x,cr->y,cr->w,cr->h);
}
else dograb = 0;
}
else {
/* different vis/cmap from parent:
add to regrab list, if not already fully contained in list */
struct rectlist *rr;
/* check to see if fully contained... */
rr=regrabList;
while (rr && RectIntersect(gx,gy,gw,gh, rr->x,rr->y,rr->w,rr->h)!=2)
rr = rr->next;
if (!rr) { /* add to list */
if (DEBUG)
fprintf(stderr,"added to regrabList: %d,%d %dx%d\n",gx,gy,gw,gh);
rr = (struct rectlist *) malloc(sizeof(struct rectlist));
if (!rr) return 1;
else {
rr->x = gx; rr->y = gy; rr->w = gw; rr->h = gh;
rr->next = regrabList;
regrabList = rr;
}
}
}
/* at this point, we have to grab gx,gy,gw,gh from 'win' */
if (dograb) {
int ix, iy, ncolors;
XColor *colors;
XImage *image;
XTranslateCoordinates(theDisp, rootW, win, gx, gy, &ix, &iy, &chwin);
if (DEBUG)
fprintf(stderr,"Grabbing win (%08x) %d,%d %dx%d\n",
(u_int) win, gx,gy,gw,gh);
WaitCursor();
xerrcode = 0;
image = XGetImage(theDisp, win, ix, iy, (u_int) gw, (u_int) gh,
AllPlanes, ZPixmap);
if (xerrcode || !image || !image->data) return 1;
ncolors = getxcolors(&xwa, &colors);
rv = convertImageAndStuff(image, colors, ncolors, &xwa,
gx - gXOFF, gy - gYOFF, gw, gh);
XDestroyImage(image); /* can't use xvDestroyImage: alloc'd by X! */
if (colors) free((char *) colors);
}
/* recurse into children to see if any of them are 'different'... */
if (!XQueryTree(theDisp, win, &root, &parent, &children, &nchildren)) {
if (DEBUG) fprintf(stderr,"XQueryTree(%08x) failed\n", (u_int) win);
if (children) XFree((char *)children);
return rv+1;
}
for (i=0; i<nchildren; i++) {
rv += grabWinImage(children[i], XVisualIDFromVisual(xwa.visual),
xwa.colormap, (win==rootW));
}
if (children) XFree((char *)children);
return rv;
}
/**************************************/
static int convertImageAndStuff(image, colors, ncolors, xwap, gx,gy,gw,gh)
XImage *image;
XColor *colors;
int ncolors;
XWindowAttributes *xwap;
int gx,gy,gw,gh; /* position within grabPic (guaranteed OK) */
{
/* attempts to convert the image from whatever weird-ass format it might
be in into a 24-bit RGB image, and stuff it into grabPic
Returns 0 on success, 1 on failure */
/* this code owes a lot to 'xwdtopnm.c', part of the pbmplus package,
written by Jef Poskanzer */
int i, j;
CARD8 *bptr, tmpbyte;
CARD16 *sptr, sval;
CARD32 *lptr, lval;
CARD8 *pptr, *lineptr;
int bits_used, bits_per_item, bit_shift, bit_order;
int bits_per_pixel, byte_order;
CARD32 pixvalue, pixmask, rmask, gmask, bmask;
int rshift, gshift, bshift, r8shift, g8shift, b8shift;
CARD32 rval, gval, bval;
union swapun sw;
int isLsbMachine, flipBytes;
Visual *visual;
char errstr[256];
/* quiet compiler warnings */
sval = 0;
lval = 0;
bit_shift = 0;
pixvalue = 0;
rmask = gmask = bmask = 0;
rshift = gshift = bshift = 0;
r8shift = g8shift = b8shift = 0;
/* determine byte order of the machine we're running on */
sw.l = 1;
isLsbMachine = (sw.b[0]) ? 1 : 0;
visual = xwap->visual;
if (DEBUG>1) {
fprintf(stderr,"convertImage:\n");
fprintf(stderr," %dx%d (offset %d), %s\n",
image->width, image->height, image->xoffset,
(image->format == XYBitmap || image->format == XYPixmap)
? "XYPixmap" : "ZPixmap");
fprintf(stderr,"byte_order = %s, bitmap_bit_order = %s, unit=%d, pad=%d\n",
(image->byte_order == LSBFirst) ? "LSBFirst" : "MSBFirst",
(image->bitmap_bit_order == LSBFirst) ? "LSBFirst" : "MSBFirst",
image->bitmap_unit, image->bitmap_pad);
fprintf(stderr,"depth = %d, bperline = %d, bits_per_pixel = %d\n",
image->depth, image->bytes_per_line, image->bits_per_pixel);
fprintf(stderr,"masks: red %lx green %lx blue %lx\n",
image->red_mask, image->green_mask, image->blue_mask);
if (isLsbMachine) fprintf(stderr,"This looks like an lsbfirst machine\n");
else fprintf(stderr,"This looks like an msbfirst machine\n");
}
if (image->bitmap_unit != 8 && image->bitmap_unit != 16 &&
image->bitmap_unit != 32) {
sprintf(errstr, "%s\nReturned image bitmap_unit (%d) non-standard.",
"Can't deal with this display.", image->bitmap_unit);
ErrPopUp(errstr, "\nThat Sucks!");
return 1;
}
if (!ncolors && visual->class != TrueColor) {
sprintf(errstr, "%s\nOnly TrueColor displays can have no colormap.",
"Can't deal with this display.");
ErrPopUp(errstr, "\nThat Sucks!");
return 1;
}
if (visual->class == TrueColor || visual->class == DirectColor) {
unsigned int tmp;
/* compute various shifty constants we'll need */
rmask = image->red_mask;
gmask = image->green_mask;
bmask = image->blue_mask;
rshift = lowbitnum((unsigned long) rmask);
gshift = lowbitnum((unsigned long) gmask);
bshift = lowbitnum((unsigned long) bmask);
r8shift = 0; tmp = rmask >> rshift;
while (tmp >= 256) { tmp >>= 1; r8shift -= 1; }
while (tmp < 128) { tmp <<= 1; r8shift += 1; }
g8shift = 0; tmp = gmask >> gshift;
while (tmp >= 256) { tmp >>= 1; g8shift -= 1; }
while (tmp < 128) { tmp <<= 1; g8shift += 1; }
b8shift = 0; tmp = bmask >> bshift;
while (tmp >= 256) { tmp >>= 1; b8shift -= 1; }
while (tmp < 128) { tmp <<= 1; b8shift += 1; }
if (DEBUG>1)
fprintf(stderr,"True/DirectColor: shifts=%d,%d,%d 8shifts=%d,%d,%d\n",
rshift, gshift, bshift, r8shift, g8shift, b8shift);
}
bits_per_item = image->bitmap_unit;
bits_used = bits_per_item;
bits_per_pixel = image->bits_per_pixel;
/* add code for freako 'exceed' server, where bitmapunit = 8
and bitsperpix = 32 (and depth=24)... */
if (bits_per_item < bits_per_pixel) {
bits_per_item = bits_per_pixel;
/* round bits_per_item up to next legal value, if necc */
if (bits_per_item < 8) bits_per_item = 8;
else if (bits_per_item < 16) bits_per_item = 16;
else bits_per_item = 32;
}
/* which raises the question: how (can?) you ever have a 24 bits per pix,
(ie, 3 bytes, no alpha/padding) */
bits_used = bits_per_item; /* so it will get a new item first time */
if (bits_per_pixel == 32) pixmask = 0xffffffff;
else pixmask = (((CARD32) 1) << bits_per_pixel) - 1;
bit_order = image->bitmap_bit_order;
byte_order = image->byte_order;
/* if we're on an lsbfirst machine, or the image came from an lsbfirst
machine, we should flip the bytes around. NOTE: if we're on an
lsbfirst machine *and* the image came from an lsbfirst machine,
*don't* flip bytes, as it should work out */
flipBytes = ( isLsbMachine && byte_order != LSBFirst) ||
(!isLsbMachine && byte_order == LSBFirst);
for (i=0; i<image->height; i++) {
pptr = grabPic + ((i+gy) * gWIDE + gx) * 3;
lineptr = (byte *) image->data + (i * image->bytes_per_line);
bptr = ((CARD8 *) lineptr) - 1;
sptr = ((CARD16 *) lineptr) - 1;
lptr = ((CARD32 *) lineptr) - 1;
bits_used = bits_per_item;
for (j=0; j<image->width; j++) {
/* get the next pixel value from the image data */
if (bits_used == bits_per_item) { /* time to move on to next b/s/l */
switch (bits_per_item) {
case 8: bptr++; break;
case 16: sptr++; sval = *sptr;
if (flipBytes) { /* swap CARD16 */
sw.s = sval;
tmpbyte = sw.b[0];
sw.b[0] = sw.b[1];
sw.b[1] = tmpbyte;
sval = sw.s;
}
break;