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ede/ede-desktop/Wallpaper.cpp

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/*
* $Id$
*
* Copyright (C) 2006-2013 Sanel Zukan
*
* This program 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; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <string.h>
#include <stdlib.h>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_RGB_Image.H>
#include <FL/fl_draw.H>
#include <edelib/Debug.h>
#include "Wallpaper.h"
#define CALC_PIXEL(tmp, rshift, rmask, gshift, gmask, bshift, bmask) \
tmp = 0; \
if(rshift >= 0) \
tmp |= (((int)r << rshift) & rmask); \
else \
tmp |= (((int)r >> (-rshift)) & rmask); \
\
if(gshift >= 0) \
tmp |= (((int)g << gshift) & gmask); \
else \
tmp |= (((int)g >> (-gshift)) & gmask); \
\
if(bshift >= 0) \
tmp |= (((int)b << bshift) & bmask); \
else \
tmp |= (((int)b >> (-bshift)) & bmask)
static Pixmap create_xpixmap(Fl_Image* img, XImage** xim, Pixmap pix, int wp_w, int wp_h) {
if(!img) return 0;
if(pix) XFreePixmap(fl_display, pix);
unsigned long rmask = fl_visual->visual->red_mask;
unsigned long gmask = fl_visual->visual->green_mask;
unsigned long bmask = fl_visual->visual->blue_mask;
unsigned long start_mask;
int start_shift;
int rshift = 0;
int gshift = 0;
int bshift = 0;
if(fl_visual->depth == 24 || fl_visual->depth == 16) {
unsigned long n;
if(fl_visual->depth == 24) {
start_shift = 24;
start_mask = 0x80000000;
} else {
start_shift = 8;
start_mask = 0x8000;
}
rshift = start_shift;
n = start_mask;
while(!(n & rmask)) {
n >>= 1;
rshift--;
}
gshift = start_shift;
n = start_mask;
while(!(n & gmask)) {
n >>= 1;
gshift--;
}
bshift = start_shift;
n = start_mask;
while(!(n & bmask)) {
n >>= 1;
bshift--;
}
}
/*
* Figure out bitmap_pad and create image coresponding to the current
* display depth except for 8 bpp display
*/
int bitmap_pad = 0;
if(fl_visual->depth > 16)
bitmap_pad = 32;
else if(fl_visual->depth > 8)
bitmap_pad = 16;
else {
E_WARNING(E_STRLOC ": Visual %i not supported\n", fl_visual->depth);
return 0;
}
*xim = XCreateImage(fl_display, fl_visual->visual, fl_visual->depth, ZPixmap, 0, 0, img->w(), img->h(), bitmap_pad, 0);
int iw = img->w();
int ih = img->h();
int id = img->d();
bool msb = (ImageByteOrder(fl_display) == MSBFirst) ? true : false;
unsigned int r, g, b, tmp;
unsigned char* dest = (unsigned char*)malloc(ih * (*xim)->bytes_per_line);
unsigned char* destptr = dest;
unsigned char* src = (unsigned char*)img->data()[0];
if((*xim)->bits_per_pixel == 32) {
if(id == 3 || id == 4) {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src++;
g = *src++;
b = *src++;
if(id == 4)
src++;
CALC_PIXEL(tmp, rshift, rmask, gshift, gmask, bshift, bmask);
if(msb) {
*destptr++ = (tmp & 0xff000000) >> 24;
*destptr++ = (tmp & 0xff0000) >> 16;
*destptr++ = (tmp & 0xff00) >> 8;
*destptr++ = (tmp & 0xff);
} else {
*destptr++ = (tmp & 0xff);
*destptr++ = (tmp & 0xff00) >> 8;
*destptr++ = (tmp & 0xff0000) >> 16;
*destptr++ = (tmp & 0xff000000) >> 24;
}
}
}
} else {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src++;
g = *src++;
b = *src++;
if(msb) {
*destptr++ = 0;
*destptr++ = b;
*destptr++ = g;
*destptr++ = r;
} else {
*destptr++ = r;
*destptr++ = g;
*destptr++ = b;
*destptr++ = 0;
}
}
}
}
} else if((*xim)->bits_per_pixel == 24) {
if(id == 3 || id == 4) {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src++;
g = *src++;
b = *src++;
if(id == 4)
src++;
CALC_PIXEL(tmp, rshift, rmask, gshift, gmask, bshift, bmask);
if(msb) {
*destptr++ = (tmp & 0xff0000) >> 16;
*destptr++ = (tmp & 0xff00) >> 8;
*destptr++ = (tmp & 0xff);
} else {
*destptr++ = (tmp & 0xff);
*destptr++ = (tmp & 0xff00) >> 8;
*destptr++ = (tmp & 0xff0000) >> 16;
}
}
}
} else {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src++;
g = *src++;
b = *src++;
if(msb) {
*destptr++ = b;
*destptr++ = g;
*destptr++ = r;
} else {
*destptr++ = r;
*destptr++ = g;
*destptr++ = b;
}
}
}
}
} else if((*xim)->bits_per_pixel == 16) {
if(id == 3 || id == 4) {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src++;
g = *src++;
b = *src++;
if(id == 4)
src++;
CALC_PIXEL(tmp, rshift, rmask, gshift, gmask, bshift, bmask);
if(msb) {
*destptr++ = (tmp >> 8) & 0xff;
*destptr++ = (tmp & 0xff);
} else {
*destptr++ = (tmp & 0xff);
*destptr++ = (tmp >> 8) & 0xff;
}
}
}
} else {
for(int j = 0; j < ih; j++) {
for(int i = 0; i < iw; i++) {
r = *src >> 3; src++;
g = *src >> 2; src++;
b = *src >> 3; src++;
*destptr++ = r << 11 | g << 5 | b;
}
}
}
}
(*xim)->data = (char*)dest;
/*
* Creating another window as drawable is needed since fl_window (as drawable) can't be
* used here (valid only in draw()). Drawable must be size as wallpaper area or clients who
* query _XA_XROOTPMAP_ID will get BadWindow when goes out of drawable area (but not out of
* wallpaper area).
*
* FIXME: drawable background should be the same color as wallpaper background
*/
Window drawable = XCreateSimpleWindow(fl_display, RootWindow(fl_display, fl_screen), 0, 0, wp_w, wp_h,
0, 0, BlackPixel(fl_display, fl_screen));
pix = XCreatePixmap(fl_display, drawable, wp_w, wp_h, fl_visual->depth);
/* The same applies as above; fl_gc can't be used here */
XGCValues gcv;
gcv.graphics_exposures = False;
GC dgc = XCreateGC(fl_display, pix, GCGraphicsExposures, &gcv);
XPutImage(fl_display, pix, dgc, *xim, 0, 0, 0, 0, iw, ih);
XDestroyWindow(fl_display, drawable);
XFreeGC(fl_display, dgc);
return pix;
}
#define PIXEL_POS(x, y, w, d) ((((y) * (w)) + (x)) * (d))
static void create_tile(Fl_Image* orig, Fl_RGB_Image** copied, int X, int Y, int W, int H) {
/* don't tile large image */
if(orig->w() >= W && orig->h() >= H) {
*copied = (Fl_RGB_Image*) orig;
return;
}
int iw = orig->w();
int ih = orig->h();
int idepth = orig->d();
int tx = X - (X % iw);
int ty = Y - (Y % ih);
int tw = W + tx;
int th = H + ty;
unsigned char* dest = new unsigned char[tw * th * orig->d()];
unsigned char* destptr = dest;
unsigned char* src = (unsigned char*)orig->data()[0];
int ppos = 0;
/* for bounds checks */
int imax = iw * ih * idepth;
if(idepth == 3 || idepth == 4) {
for(int j = 0, cj = 0; j < th; j++, cj++) {
if(cj > ih) cj = 0;
for(int i = 0, ci = 0; i < tw; i++, ci++) {
if(ci > iw) ci = 0;
ppos = PIXEL_POS(ci, cj, iw, idepth);
if(ppos > imax) ppos = imax;
*destptr++ = src[ppos];
*destptr++ = src[ppos + 1];
*destptr++ = src[ppos + 2];
if(idepth == 4)
*destptr++ = src[ppos + 3];
}
}
} else if(idepth == 2) {
for(int j = 0, cj = 0; j < th; j++, cj++) {
if(cj > ih) cj = 0;
for(int i = 0, ci = 0; i < tw; i++, ci++) {
if(ci > iw) ci = 0;
ppos = PIXEL_POS(ci, cj, iw, idepth);
if(ppos > imax) ppos = imax;
*destptr++ = src[ppos];
*destptr++ = src[ppos + 1];
}
}
} else {
for(int j = 0, cj = 0; j < th; j++, cj++) {
if(cj > ih) cj = 0;
for(int i = 0, ci = 0; i < tw; i++, ci++) {
if(ci > iw) ci = 0;
ppos = PIXEL_POS(ci, cj, iw, idepth);
if(ppos > imax) ppos = imax;
*destptr++ = src[ppos];
}
}
}
Fl_RGB_Image* c = new Fl_RGB_Image(dest, tw, th, idepth, orig->ld());
c->alloc_array = 1;
*copied = c;
}
Wallpaper::~Wallpaper() {
if(rootpmap_pixmap) XFreePixmap(fl_display, rootpmap_pixmap);
delete stretched_alloc;
}
void Wallpaper::set_rootpmap(void) {
E_RETURN_IF_FAIL(image() != NULL);
XImage *rootpmap_image = 0;
Atom _XA_XROOTPMAP_ID;
rootpmap_pixmap = create_xpixmap(image(), &rootpmap_image, rootpmap_pixmap, w(), h());
E_RETURN_IF_FAIL(rootpmap_pixmap != 0);
/* XDestroyImage function calls frees both the image structure and the data pointed to by the image structure */
if(rootpmap_image)
XDestroyImage(rootpmap_image);
_XA_XROOTPMAP_ID = XInternAtom(fl_display, "_XROOTPMAP_ID", False);
XChangeProperty(fl_display, RootWindow(fl_display, fl_screen),
_XA_XROOTPMAP_ID, XA_PIXMAP, 32, PropModeReplace, (unsigned char *)&rootpmap_pixmap, 1);
}
bool Wallpaper::load(const char *path, int s, bool rootpmap) {
E_ASSERT(path != NULL);
Fl_Shared_Image *img = Fl_Shared_Image::get(path);
E_RETURN_VAL_IF_FAIL(img != NULL, false);
if(s != WALLPAPER_CENTER && s != WALLPAPER_TILE && s != WALLPAPER_STRETCH)
s = WALLPAPER_CENTER;
if(s == WALLPAPER_TILE) {
Fl_RGB_Image *tiled;
create_tile((Fl_Image*)img, &tiled, x(), y(), w(), h());
image(tiled);
} else if(s == WALLPAPER_STRETCH) {
Fl_Image *stretched = NULL;
if(img->w() == w() && img->h() == h())
stretched = img;
else {
/* valgrind reports it as possible lost, but FLTK should free it */
delete stretched_alloc;
stretched = img->copy(w(), h());
img->release();
stretched_alloc = stretched;
}
image(stretched);
} else {
image(img);
}
/* set root pixmap for pseudo transparency */
if(rootpmap) set_rootpmap();
state = s;
use_rootpmap = rootpmap;
/* prevent self assignment or bad things will happen */
if(wpath != path) wpath = path;
return true;
}
void Wallpaper::draw(void) {
E_RETURN_IF_FAIL(image() != NULL);
int ix, iy, iw, ih;
Fl_Image* im = image();
iw = im->w();
ih = im->h();
E_RETURN_IF_FAIL(iw > 0 && ih > 0);
if(state == WALLPAPER_CENTER) {
ix = (w()/2) - (iw/2);
iy = (h()/2) - (ih/2);
ix += x();
iy += y();
} else {
ix = x();
iy = y();
}
im->draw(ix, iy);
#if 0
/*
* For debugging purposes :)
* Uncommenting this (and removing GC/Window creation in create_xpixmap will draw _XA_XROOTPMAP_ID
* Pixmap directly in Wallpaper widget. Used to check Fl_Image->Image conversion.
*/
if(global_xim) {
Pixmap pix = fl_create_offscreen(image()->w(), image()->h());
fl_begin_offscreen(pix);
XPutImage(fl_display, pix, fl_gc, global_xim, 0, 0, 0, 0, image()->w(), image()->h());
fl_end_offscreen();
fl_copy_offscreen(ix, iy, image()->w(), image()->h(), pix, 0, 0);
XChangeProperty(fl_display, RootWindow(fl_display, fl_screen),
_XA_XROOTPMAP_ID, XA_PIXMAP, 32, PropModeReplace, (unsigned char *)&pix, 1);
}
#endif
}
int Wallpaper::handle(int event) {
switch(event) {
/* Route all DND events to parent (desktop), otherwise desktop will not get them if Wallpaper is visible */
case FL_DND_ENTER:
case FL_DND_DRAG:
case FL_DND_LEAVE:
case FL_DND_RELEASE:
case FL_PASTE:
return parent()->handle(event);
}
return 0;
}
void Wallpaper::resize(int X, int Y, int W, int H) {
if(X == x() && Y == y() && W == w() && H == h())
return;
Fl_Box::resize(X, Y, W, H);
if(image()) {
/*
* It is safe to call 'load()' again, as Fl_Shared_Image::get() will cache successfully loaded image.
* Also benefit is that image transormations (scaling, tiling) will be done again on original image, so
* there will be no lost data.
*
* TODO: Fl_Shared_Image will eat a memory; this needs some investigation.
*/
load(wpath.c_str(), state, use_rootpmap);
}
}
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