fltk/src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx

//
// "$Id$"
//
// Definition of Apple Cocoa window driver.
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//


#include "../../config_lib.h"
#include <FL/fl_draw.H>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Image.H>
#include <FL/Fl_Bitmap.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Overlay_Window.H>
#include <FL/x.H>
#include "Fl_WinAPI_Window_Driver.H"
#include <windows.h>

#if USE_COLORMAP
extern HPALETTE fl_select_palette(void); // in fl_color_win32.cxx
#endif


Fl_Window_Driver *Fl_Window_Driver::newWindowDriver(Fl_Window *w)
{
  return new Fl_WinAPI_Window_Driver(w);
}


Fl_WinAPI_Window_Driver::Fl_WinAPI_Window_Driver(Fl_Window *win)
: Fl_Window_Driver(win)
{
  icon_ = new icon_data;
  memset(icon_, 0, sizeof(icon_data));
}


Fl_WinAPI_Window_Driver::~Fl_WinAPI_Window_Driver()
{
  if (shape_data_) {
    delete shape_data_->todelete_;
    delete shape_data_;
  }
  delete icon_;
}


// --- private

RECT Fl_WinAPI_Window_Driver::border_width_title_bar_height(int &bx, int &by, int &bt)
{
  Fl_Window *win = pWindow;
  RECT r = {0,0,0,0};
  bx = by = bt = 0;
  if (win->shown() && !win->parent() && win->border() && win->visible()) {
    static HMODULE dwmapi_dll = LoadLibrary("dwmapi.dll");
    typedef HRESULT (WINAPI* DwmGetWindowAttribute_type)(HWND hwnd, DWORD dwAttribute, PVOID pvAttribute, DWORD cbAttribute);
    static DwmGetWindowAttribute_type DwmGetWindowAttribute = dwmapi_dll ?
    (DwmGetWindowAttribute_type)GetProcAddress(dwmapi_dll, "DwmGetWindowAttribute") : NULL;
    int need_r = 1;
    if (DwmGetWindowAttribute) {
      const DWORD DWMWA_EXTENDED_FRAME_BOUNDS = 9;
      if ( DwmGetWindowAttribute(fl_xid(win), DWMWA_EXTENDED_FRAME_BOUNDS, &r, sizeof(RECT)) == S_OK ) {
        need_r = 0;
      }
    }
    if (need_r) {
      GetWindowRect(fl_xid(win), &r);
    }
    bx = (r.right - r.left - win->w())/2;
    by = bx;
    bt = r.bottom - r.top - win->h() - 2*by;
  }
  return RECT(r);
}


// --- window data

int Fl_WinAPI_Window_Driver::decorated_w()
{
  int bt, bx, by;
  border_width_title_bar_height(bx, by, bt);
  return pWindow->w() + 2 * bx;
}

int Fl_WinAPI_Window_Driver::decorated_h()
{
  int bt, bx, by;
  border_width_title_bar_height(bx, by, bt);
  return pWindow->h() + bt + 2 * by;
}


// --- window management



void Fl_WinAPI_Window_Driver::shape_bitmap_(Fl_Image* b) {
  shape_data_->shape_ = b;
}

void Fl_WinAPI_Window_Driver::shape_alpha_(Fl_Image* img, int offset) {
  int i, j, d = img->d(), w = img->w(), h = img->h(), bytesperrow = (w+7)/8;
  unsigned u;
  uchar byte, onebit;
  // build an Fl_Bitmap covering the non-fully transparent/black part of the image
  const uchar* bits = new uchar[h*bytesperrow]; // to store the bitmap
  const uchar* alpha = (const uchar*)*img->data() + offset; // points to alpha value of rgba pixels
  for (i = 0; i < h; i++) {
    uchar *p = (uchar*)bits + i * bytesperrow;
    byte = 0;
    onebit = 1;
    for (j = 0; j < w; j++) {
      if (d == 3) {
        u = *alpha;
        u += *(alpha+1);
        u += *(alpha+2);
      }
      else u = *alpha;
      if (u > 0) { // if the pixel is not fully transparent/black
        byte |= onebit; // turn on the corresponding bit of the bitmap
      }
      onebit = onebit << 1; // move the single set bit one position to the left
      if (onebit == 0 || j == w-1) {
        onebit = 1;
        *p++ = byte; // store in bitmap one pack of bits
        byte = 0;
      }
      alpha += d; // point to alpha value of next pixel
    }
  }
  Fl_Bitmap* bitmap = new Fl_Bitmap(bits, w, h);
  bitmap->alloc_array = 1;
  shape_bitmap_(bitmap);
  shape_data_->todelete_ = bitmap;
}

void Fl_WinAPI_Window_Driver::shape(const Fl_Image* img) {
  if (shape_data_) {
    if (shape_data_->todelete_) { delete shape_data_->todelete_; }
  }
  else {
    shape_data_ = new shape_data_type;
  }
  memset(shape_data_, 0, sizeof(shape_data_type));
  pWindow->border(false);
  int d = img->d();
  if (d && img->count() >= 2) shape_pixmap_((Fl_Image*)img);
  else if (d == 0) shape_bitmap_((Fl_Image*)img);
  else if (d == 2 || d == 4) shape_alpha_((Fl_Image*)img, d - 1);
  else if ((d == 1 || d == 3) && img->count() == 1) shape_alpha_((Fl_Image*)img, 0);
}


static inline BYTE bit(int x) { return (BYTE)(1 << (x%8)); }

static HRGN bitmap2region(Fl_Image* image) {
  HRGN hRgn = 0;
  /* Does this need to be dynamically determined, perhaps? */
  const int ALLOC_UNIT = 100;
  DWORD maxRects = ALLOC_UNIT;
  
  RGNDATA* pData = (RGNDATA*)malloc(sizeof(RGNDATAHEADER)+(sizeof(RECT)*maxRects));
  pData->rdh.dwSize = sizeof(RGNDATAHEADER);
  pData->rdh.iType = RDH_RECTANGLES;
  pData->rdh.nCount = pData->rdh.nRgnSize = 0;
  SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
  
  const int bytesPerLine = (image->w() + 7)/8;
  BYTE* p, *data = (BYTE*)*image->data();
  for (int y = 0; y < image->h(); y++) {
    // each row, left to right
    for (int x = 0; x < image->w(); x++) {
      int x0 = x;
      while (x < image->w()) {
        p = data + x / 8;
        if (!((*p) & bit(x))) break; // transparent pixel
        x++;
      }
      if (x > x0) {
        RECT *pr;
        /* Add the pixels (x0, y) to (x, y+1) as a new rectangle
         * in the region
         */
        if (pData->rdh.nCount >= maxRects) {
          maxRects += ALLOC_UNIT;
          pData = (RGNDATA*)realloc(pData, sizeof(RGNDATAHEADER)
                                    + (sizeof(RECT)*maxRects));
        }
        pr = (RECT*)&pData->Buffer;
        SetRect(&pr[pData->rdh.nCount], x0, y, x, y+1);
        if (x0 < pData->rdh.rcBound.left)
          pData->rdh.rcBound.left = x0;
        if (y < pData->rdh.rcBound.top)
          pData->rdh.rcBound.top = y;
        if (x > pData->rdh.rcBound.right)
          pData->rdh.rcBound.right = x;
        if (y+1 > pData->rdh.rcBound.bottom)
          pData->rdh.rcBound.bottom = y+1;
        pData->rdh.nCount++;
        /* On Windows98, ExtCreateRegion() may fail if the
         * number of rectangles is too large (ie: >
         * 4000). Therefore, we have to create the region by
         * multiple steps.
         */
        if (pData->rdh.nCount == 2000) {
          HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER)
                                   + (sizeof(RECT)*maxRects), pData);
          if (hRgn) {
            CombineRgn(hRgn, hRgn, h, RGN_OR);
            DeleteObject(h);
          } else
            hRgn = h;
          pData->rdh.nCount = 0;
          SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
        }
      }
    }
    /* Go to next row */
    data += bytesPerLine;
  }
  /* Create or extend the region with the remaining rectangles*/
  HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER)
                           + (sizeof(RECT)*maxRects), pData);
  if (hRgn) {
    CombineRgn(hRgn, hRgn, h, RGN_OR);
    DeleteObject(h);
  } else hRgn = h;
  free(pData); // I've created the region so I can free this now, right?
  return hRgn;
}


void Fl_WinAPI_Window_Driver::draw_begin()
{
  if (shape_data_) {
    if ((shape_data_->lw_ != pWindow->w() || shape_data_->lh_ != pWindow->h()) && shape_data_->shape_) {
      // size of window has changed since last time
      shape_data_->lw_ = pWindow->w();
      shape_data_->lh_ = pWindow->h();
      Fl_Image* temp = shape_data_->shape_->copy(shape_data_->lw_, shape_data_->lh_);
      HRGN region = bitmap2region(temp);
      SetWindowRgn(fl_xid(pWindow), region, TRUE); // the system deletes the region when it's no longer needed
      delete temp;
    }
  }
}


void Fl_WinAPI_Window_Driver::flush_double()
{
  if (!pWindow->shown()) return;
  pWindow->make_current(); // make sure fl_gc is non-zero
  Fl_X *i = Fl_X::i(pWindow);
  if (!i) return; // window not yet created

  if (!i->other_xid) {
    i->other_xid = fl_create_offscreen(pWindow->w(), pWindow->h());
    pWindow->clear_damage(FL_DAMAGE_ALL);
  }
  if (pWindow->damage() & ~FL_DAMAGE_EXPOSE) {
    fl_clip_region(i->region); i->region = 0;
    fl_begin_offscreen(i->other_xid);
    fl_graphics_driver->clip_region( 0 );
    draw();
    fl_end_offscreen();
  }

  int X,Y,W,H; fl_clip_box(0,0,pWindow->w(),pWindow->h(),X,Y,W,H);
  if (i->other_xid) fl_copy_offscreen(X, Y, W, H, i->other_xid, X, Y);
}


void Fl_WinAPI_Window_Driver::flush_overlay()
{
  Fl_Overlay_Window *oWindow = pWindow->as_overlay_window();

  if (!pWindow->shown()) return;
  pWindow->make_current(); // make sure fl_gc is non-zero
  Fl_X *i = Fl_X::i(pWindow);
  if (!i) return; // window not yet created

  int eraseoverlay = (pWindow->damage()&FL_DAMAGE_OVERLAY);
  pWindow->clear_damage((uchar)(pWindow->damage()&~FL_DAMAGE_OVERLAY));

  if (!i->other_xid) {
    i->other_xid = fl_create_offscreen(pWindow->w(), pWindow->h());
    pWindow->clear_damage(FL_DAMAGE_ALL);
  }
  if (pWindow->damage() & ~FL_DAMAGE_EXPOSE) {
    fl_clip_region(i->region); i->region = 0;
    fl_begin_offscreen(i->other_xid);
    fl_graphics_driver->clip_region(0);
    draw();
    fl_end_offscreen();
  }

  if (eraseoverlay) fl_clip_region(0);
  int X, Y, W, H; fl_clip_box(0, 0, pWindow->w(), pWindow->h(), X, Y, W, H);
  if (i->other_xid) fl_copy_offscreen(X, Y, W, H, i->other_xid, X, Y);

  if (oWindow->overlay_ == oWindow) oWindow->draw_overlay();
}


void Fl_WinAPI_Window_Driver::icons(const Fl_RGB_Image *icons[], int count) {
  free_icons();
  
  if (count > 0) {
    icon_->icons = new Fl_RGB_Image*[count];
    icon_->count = count;
    // FIXME: Fl_RGB_Image lacks const modifiers on methods
    for (int i = 0;i < count;i++)
      icon_->icons[i] = (Fl_RGB_Image*)((Fl_RGB_Image*)icons[i])->copy();
  }
  
  if (Fl_X::i(pWindow))
    Fl_X::i(pWindow)->set_icons();
}

const void *Fl_WinAPI_Window_Driver::icon() const {
  return icon_->legacy_icon;
}

void Fl_WinAPI_Window_Driver::icon(const void * ic) {
  free_icons();
  icon_->legacy_icon = ic;
}

void Fl_WinAPI_Window_Driver::free_icons() {
  int i;
  icon_->legacy_icon = 0L;
  if (icon_->icons) {
    for (i = 0;i < icon_->count;i++)
      delete icon_->icons[i];
    delete [] icon_->icons;
    icon_->icons = 0L;
  }
  icon_->count = 0;
  if (icon_->big_icon)
    DestroyIcon(icon_->big_icon);
  if (icon_->small_icon)
    DestroyIcon(icon_->small_icon);
  icon_->big_icon = NULL;
  icon_->small_icon = NULL;
}


/** Sets the window icons using Windows' native HICON icon handles.
 
 The given icons are copied. You can free the icons immediately after
 this call.
 
 \param[in] big_icon large window icon
 \param[in] small_icon  small window icon
 */
void Fl_Window::icons(HICON big_icon, HICON small_icon)
{
  free_icons();
  
  if (big_icon != NULL)
    ((Fl_WinAPI_Window_Driver*)pWindowDriver)->icon_->big_icon = CopyIcon(big_icon);
  if (small_icon != NULL)
    ((Fl_WinAPI_Window_Driver*)pWindowDriver)->icon_->small_icon = CopyIcon(small_icon);
  
  if (Fl_X::i(this))
    Fl_X::i(this)->set_icons();
}


/** Sets the default window icons.
 
 Convenience function to set the default icons using Windows'
 native HICON icon handles.
 
 The given icons are copied. You can free the icons immediately after
 this call.
 
 \param[in] big_icon default large icon for all windows
 subsequently created
 \param[in] small_icon default small icon for all windows
 subsequently created
 
 \see Fl_Window::default_icon(const Fl_RGB_Image *)
 \see Fl_Window::default_icons(const Fl_RGB_Image *[], int)
 \see Fl_Window::icon(const Fl_RGB_Image *)
 \see Fl_Window::icons(const Fl_RGB_Image *[], int)
 \see Fl_Window::icons(HICON, HICON)
 */
void Fl_Window::default_icons(HICON big_icon, HICON small_icon) {
  Fl_X::set_default_icons(big_icon, small_icon);
}


void Fl_WinAPI_Window_Driver::wait_for_expose() {
  if (!pWindow->shown()) return;
  Fl_X *i = Fl_X::i(pWindow);
  while (!i || i->wait_for_expose) {
    Fl::wait();
  }
}


void Fl_WinAPI_Window_Driver::make_current() {
  fl_GetDC(fl_xid(pWindow));
  
#if USE_COLORMAP
  // Windows maintains a hardware and software color palette; the
  // SelectPalette() call updates the current soft->hard mapping
  // for all drawing calls, so we must select it here before any
  // code does any drawing...
  fl_select_palette();
#endif // USE_COLORMAP
  
  fl_graphics_driver->clip_region(0);
}

void Fl_WinAPI_Window_Driver::label(const char *name,const char *iname) {
  if (pWindow->shown() && !pWindow->parent()) {
    if (!name) name = "";
    size_t l = strlen(name);
    //  WCHAR *lab = (WCHAR*) malloc((l + 1) * sizeof(short));
    //  l = fl_utf2unicode((unsigned char*)name, l, (xchar*)lab);
    unsigned wlen = fl_utf8toUtf16(name, (unsigned) l, NULL, 0); // Pass NULL to query length
    wlen++;
    unsigned short * lab = (unsigned short*)malloc(sizeof(unsigned short)*wlen);
    wlen = fl_utf8toUtf16(name, (unsigned) l, lab, wlen);
    lab[wlen] = 0;
    SetWindowTextW(fl_xid(pWindow), (WCHAR *)lab);
    free(lab);
  }
}

//
// End of "$Id$".
//