Fl_Pixmap.cxx

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//
// "$Id: Fl_Pixmap.cxx 8190 2011-01-05 10:21:45Z manolo $"
//
// Pixmap drawing code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

// Draws X pixmap data, keeping it stashed in a server pixmap so it
// redraws fast.

// See fl_draw_pixmap.cxx for code used to get the actual data into pixmap.
// Implemented without using the xpm library (which I can't use because
// it interferes with the color cube used by fl_draw_image).

#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/x.H>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Menu_Item.H>
#include <FL/Fl_Pixmap.H>
#include <FL/Fl_Printer.H>

#include <stdio.h>
#include "flstring.h"
#include <ctype.h>

#ifdef WIN32
extern void fl_release_dc(HWND, HDC);      // located in Fl_win32.cxx
#endif

#ifdef __APPLE_QUARTZ__
extern Fl_Offscreen fl_create_offscreen_with_alpha(int w, int h);
#endif

extern uchar **fl_mask_bitmap; // used by fl_draw_pixmap.cxx to store mask
void fl_restore_clip(); // in fl_rect.cxx

void Fl_Pixmap::measure() {
  int W, H;

  // ignore empty or bad pixmap data:
  if (w()<0 && data()) {
    fl_measure_pixmap(data(), W, H);
    w(W); h(H);
  }
}

void Fl_Pixmap::draw(int XP, int YP, int WP, int HP, int cx, int cy) {
  fl_graphics_driver->draw(this, XP, YP, WP, HP, cx, cy);
}

static int start(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int w, int h, int &cx, int &cy, 
                 int &X, int &Y, int &W, int &H)
{
  // ignore empty or bad pixmap data:
  if (!pxm->data()) {
    return 2;
  }
  if (WP == -1) {
    WP = w;
    HP = h;
  }
  if (!w) {
    return 2;
  }
  // account for current clip region (faster on Irix):
  fl_clip_box(XP,YP,WP,HP,X,Y,W,H);
  cx += X-XP; cy += Y-YP;
  // clip the box down to the size of image, quit if empty:
  if (cx < 0) {W += cx; X -= cx; cx = 0;}
  if (cx+W > w) W = w-cx;
  if (W <= 0) return 1;
  if (cy < 0) {H += cy; Y -= cy; cy = 0;}
  if (cy+H > h) H = h-cy;
  if (H <= 0) return 1;
  return 0;
}

#ifdef __APPLE__
void Fl_Quartz_Graphics_Driver::draw(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy) {
  int X, Y, W, H;
  if (pxm->w() < 0) pxm->measure();
  int code = start(pxm, XP, YP, WP, HP, pxm->w(), pxm->h(), cx, cy, X, Y, W, H);
  if (code) {
    if (code == 2) pxm->draw_empty(XP, YP);
    return;
    }
  if (!pxm->id_) {
    pxm->id_ = fl_create_offscreen_with_alpha(pxm->w(), pxm->h());
    fl_begin_offscreen((Fl_Offscreen)pxm->id_);
    fl_draw_pixmap(pxm->data(), 0, 0, FL_GREEN);
    fl_end_offscreen();
    }
  fl_copy_offscreen(X, Y, W, H, (Fl_Offscreen)pxm->id_, cx, cy);
}

#elif defined(WIN32)
void Fl_GDI_Graphics_Driver::draw(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy) {
  int X, Y, W, H;
  if (pxm->w() < 0) pxm->measure();
  int code = start(pxm, XP, YP, WP, HP, pxm->w(), pxm->h(), cx, cy, X, Y, W, H);
  if (code) {
    if (code == 2) pxm->draw_empty(XP, YP);
    return;
  }
  if (!pxm->id_) {
    pxm->id_ = fl_create_offscreen(pxm->w(), pxm->h());
    fl_begin_offscreen((Fl_Offscreen)pxm->id_);
    uchar *bitmap = 0;
    fl_mask_bitmap = &bitmap;
    fl_draw_pixmap(pxm->data(), 0, 0, FL_BLACK);
    fl_mask_bitmap = 0;
    if (bitmap) {
      pxm->mask_ = fl_create_bitmask(pxm->w(), pxm->h(), bitmap);
      delete[] bitmap;
    }
    fl_end_offscreen();
  }
  if (fl_surface->class_name() == Fl_Printer::class_id) {
    typedef BOOL (WINAPI* fl_transp_func)  (HDC,int,int,int,int,HDC,int,int,int,int,UINT);
    static HMODULE hMod = NULL;
    static fl_transp_func fl_TransparentBlt = NULL;
    if (!hMod) {
      hMod = LoadLibrary("MSIMG32.DLL");
      if(hMod) fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod, "TransparentBlt");
    }
    if (fl_TransparentBlt) {
      Fl_Offscreen tmp_id = fl_create_offscreen(pxm->w(), pxm->h());
      fl_begin_offscreen(tmp_id);
      uchar *bitmap = 0;
      fl_mask_bitmap = &bitmap;
      // draw pixmap to offscreen
      fl_draw_pixmap(pxm->data(), 0, 0); 
      fl_end_offscreen();
      HDC new_gc = CreateCompatibleDC(fl_gc);
      int save = SaveDC(new_gc);
      SelectObject(new_gc, (void*)tmp_id);
      // print all of offscreen but its parts in background color
      extern UINT win_pixmap_bg_color; // computed by fl_draw_pixmap()
      fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, pxm->w(), pxm->h(), win_pixmap_bg_color );
      RestoreDC(new_gc,save);
      DeleteDC(new_gc);
      fl_delete_offscreen(tmp_id);
    }
    else {
      fl_copy_offscreen(X, Y, W, H, (Fl_Offscreen)pxm->id_, cx, cy);
    }
  }
  else if (pxm->mask_) {
    HDC new_gc = CreateCompatibleDC(fl_gc);
    int save = SaveDC(new_gc);
    SelectObject(new_gc, (void*)pxm->mask_);
    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
    SelectObject(new_gc, (void*)pxm->id_);
    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
    RestoreDC(new_gc,save);
    DeleteDC(new_gc);
  } else {
    fl_copy_offscreen(X, Y, W, H, (Fl_Offscreen)pxm->id_, cx, cy);
  }
}

#else // Xlib
void Fl_Xlib_Graphics_Driver::draw(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy) {
  int X, Y, W, H;
  if (pxm->w() < 0) pxm->measure();
  int code = start(pxm, XP, YP, WP, HP, pxm->w(), pxm->h(), cx, cy, X, Y, W, H);
  if (code) {
    if (code == 2) pxm->draw_empty(XP, YP);
    return;
  }
  if (!pxm->id_) {
    pxm->id_ = fl_create_offscreen(pxm->w(), pxm->h());
    fl_begin_offscreen((Fl_Offscreen)pxm->id_);
    uchar *bitmap = 0;
    fl_mask_bitmap = &bitmap;
    fl_draw_pixmap(pxm->data(), 0, 0, FL_BLACK);
    fl_mask_bitmap = 0;
    if (bitmap) {
      pxm->mask_ = fl_create_bitmask(pxm->w(), pxm->h(), bitmap);
      delete[] bitmap;
    }
    fl_end_offscreen();
  }
  if (pxm->mask_) {
    // I can't figure out how to combine a mask with existing region,
    // so cut the image down to a clipped rectangle:
    int nx, ny; fl_clip_box(X,Y,W,H,nx,ny,W,H);
    cx += nx-X; X = nx;
    cy += ny-Y; Y = ny;
    // make X use the bitmap as a mask:
    XSetClipMask(fl_display, fl_gc, pxm->mask_);
    int ox = X-cx; if (ox < 0) ox += pxm->w();
    int oy = Y-cy; if (oy < 0) oy += pxm->h();
    XSetClipOrigin(fl_display, fl_gc, X-cx, Y-cy);
  }
  fl_copy_offscreen(X, Y, W, H, pxm->id_, cx, cy);
  if (pxm->mask_) {
    // put the old clip region back
    XSetClipOrigin(fl_display, fl_gc, 0, 0);
    fl_restore_clip();
  }
}

#endif

Fl_Pixmap::~Fl_Pixmap() {
  uncache();
  delete_data();
}

void Fl_Pixmap::uncache() {
  if (id_) {
    fl_delete_offscreen((Fl_Offscreen)id_);
    id_ = 0;
  }

  if (mask_) {
    fl_delete_bitmask((Fl_Bitmask)mask_);
    mask_ = 0;
  }
}

void Fl_Pixmap::label(Fl_Widget* widget) {
  widget->image(this);
}

void Fl_Pixmap::label(Fl_Menu_Item* m) {
  Fl::set_labeltype(_FL_IMAGE_LABEL, labeltype, Fl_Image::measure);
  m->label(_FL_IMAGE_LABEL, (const char*)this);
}

void Fl_Pixmap::copy_data() {
  if (alloc_data) return;

  char          **new_data,     // New data array
                **new_row;      // Current row in image
  int           i,              // Looping var
                ncolors,        // Number of colors in image
                chars_per_pixel,// Characters per color
                chars_per_line; // Characters per line 

  // Figure out how many colors there are, and how big they are...
  sscanf(data()[0],"%*d%*d%d%d", &ncolors, &chars_per_pixel);
  chars_per_line = chars_per_pixel * w() + 1;

  // Allocate memory for the new array...
  if (ncolors < 0) new_data = new char *[h() + 2];
  else new_data = new char *[h() + ncolors + 1];

  new_data[0] = new char[strlen(data()[0]) + 1];
  strcpy(new_data[0], data()[0]);

  // Copy colors...
  if (ncolors < 0) {
    // Copy FLTK colormap values...
    ncolors = -ncolors;
    new_row = new_data + 1;
    *new_row = new char[ncolors * 4];
    memcpy(*new_row, data()[1], ncolors * 4);
    ncolors = 1;
    new_row ++;
  } else {
    // Copy standard XPM colormap values...
    for (i = 0, new_row = new_data + 1; i < ncolors; i ++, new_row ++) {
      *new_row = new char[strlen(data()[i + 1]) + 1];
      strcpy(*new_row, data()[i + 1]);
    }
  }

  // Copy image data...
  for (i = 0; i < h(); i ++, new_row ++) {
    *new_row = new char[chars_per_line];
    memcpy(*new_row, data()[i + ncolors + 1], chars_per_line);
  }

  // Update pointers...
  data((const char **)new_data, h() + ncolors + 1);
  alloc_data = 1;  
}

Fl_Image *Fl_Pixmap::copy(int W, int H) {
  Fl_Pixmap     *new_image;     // New pixmap

  // Optimize the simple copy where the width and height are the same...
  if (W == w() && H == h()) {
    // Make an exact copy of the image and return it...
    new_image = new Fl_Pixmap(data());
    new_image->copy_data();
    return new_image;
  }
  if (W <= 0 || H <= 0) return 0;

  // OK, need to resize the image data; allocate memory and 
  char          **new_data,     // New array for image data
                **new_row,      // Pointer to row in image data
                *new_ptr,       // Pointer into new array
                new_info[255];  // New information line
  const char    *old_ptr;       // Pointer into old array
  int           i,              // Looping var
                c,              // Channel number
                sy,             // Source coordinate
                dx, dy,         // Destination coordinates
                xerr, yerr,     // X & Y errors
                xmod, ymod,     // X & Y moduli
                xstep, ystep;   // X & Y step increments
  int           ncolors,        // Number of colors in image
                chars_per_pixel,// Characters per color
                chars_per_line; // Characters per line 

  // Figure out how many colors there are, and how big they are...
  sscanf(data()[0],"%*d%*d%d%d", &ncolors, &chars_per_pixel);
  chars_per_line = chars_per_pixel * W + 1;

  sprintf(new_info, "%d %d %d %d", W, H, ncolors, chars_per_pixel);

  // Figure out Bresenheim step/modulus values...
  xmod   = w() % W;
  xstep  = (w() / W) * chars_per_pixel;
  ymod   = h() % H;
  ystep  = h() / H;

  // Allocate memory for the new array...
  if (ncolors < 0) new_data = new char *[H + 2];
  else new_data = new char *[H + ncolors + 1];
  new_data[0] = new char[strlen(new_info) + 1];
  strcpy(new_data[0], new_info);

  // Copy colors...
  if (ncolors < 0) {
    // Copy FLTK colormap values...
    ncolors = -ncolors;
    new_row = new_data + 1;
    *new_row = new char[ncolors * 4];
    memcpy(*new_row, data()[1], ncolors * 4);
    ncolors = 1;
    new_row ++;
  } else {
    // Copy standard XPM colormap values...
    for (i = 0, new_row = new_data + 1; i < ncolors; i ++, new_row ++) {
      *new_row = new char[strlen(data()[i + 1]) + 1];
      strcpy(*new_row, data()[i + 1]);
    }
  }

  // Scale the image using a nearest-neighbor algorithm...
  for (dy = H, sy = 0, yerr = H; dy > 0; dy --, new_row ++) {
    *new_row = new char[chars_per_line];
    new_ptr  = *new_row;

    for (dx = W, xerr = W, old_ptr = data()[sy + ncolors + 1];
         dx > 0;
         dx --) {
      for (c = 0; c < chars_per_pixel; c ++) *new_ptr++ = old_ptr[c];

      old_ptr += xstep;
      xerr    -= xmod;

      if (xerr <= 0) {
        xerr    += W;
        old_ptr += chars_per_pixel;
      }
    }

    *new_ptr = '\0';
    sy       += ystep;
    yerr     -= ymod;
    if (yerr <= 0) {
      yerr += H;
      sy ++;
    }
  }

  new_image = new Fl_Pixmap((char*const*)new_data);
  new_image->alloc_data = 1;

  return new_image;
}

void Fl_Pixmap::color_average(Fl_Color c, float i) {
  // Delete any existing pixmap/mask objects...
  uncache();

  // Allocate memory as needed...
  copy_data();

  // Get the color to blend with...
  uchar         r, g, b;
  unsigned      ia, ir, ig, ib;

  Fl::get_color(c, r, g, b);
  if (i < 0.0f) i = 0.0f;
  else if (i > 1.0f) i = 1.0f;

  ia = (unsigned)(256 * i);
  ir = r * (256 - ia);
  ig = g * (256 - ia);
  ib = b * (256 - ia);

  // Update the colormap to do the blend...
  char          line[255];      // New colormap line
  int           color,          // Looping var
                ncolors,        // Number of colors in image
                chars_per_pixel;// Characters per color


  sscanf(data()[0],"%*d%*d%d%d", &ncolors, &chars_per_pixel);

  if (ncolors < 0) {
    // Update FLTK colormap...
    ncolors = -ncolors;
    uchar *cmap = (uchar *)(data()[1]);
    for (color = 0; color < ncolors; color ++, cmap += 4) {
      cmap[1] = (ia * cmap[1] + ir) >> 8;
      cmap[2] = (ia * cmap[2] + ig) >> 8;
      cmap[3] = (ia * cmap[3] + ib) >> 8;
    }
  } else {
    // Update standard XPM colormap...
    for (color = 0; color < ncolors; color ++) {
      // look for "c word", or last word if none:
      const char *p = data()[color + 1] + chars_per_pixel + 1;
      const char *previous_word = p;
      for (;;) {
        while (*p && isspace(*p)) p++;
        char what = *p++;
        while (*p && !isspace(*p)) p++;
        while (*p && isspace(*p)) p++;
        if (!*p) {p = previous_word; break;}
        if (what == 'c') break;
        previous_word = p;
        while (*p && !isspace(*p)) p++;
      }

      if (fl_parse_color(p, r, g, b)) {
        r = (ia * r + ir) >> 8;
        g = (ia * g + ig) >> 8;
        b = (ia * b + ib) >> 8;

        if (chars_per_pixel > 1) sprintf(line, "%c%c c #%02X%02X%02X",
                                         data()[color + 1][0],
                                         data()[color + 1][1], r, g, b);
        else sprintf(line, "%c c #%02X%02X%02X", data()[color + 1][0], r, g, b);

        delete[] (char *)data()[color + 1];
        ((char **)data())[color + 1] = new char[strlen(line) + 1];
        strcpy((char *)data()[color + 1], line);
      }
    }
  }
}

void Fl_Pixmap::delete_data() {
  if (alloc_data) {
    for (int i = 0; i < count(); i ++) delete[] (char *)data()[i];
    delete[] (char **)data();
  }
}

void Fl_Pixmap::set_data(const char * const * p) {
  int   height,         // Number of lines in image
        ncolors;        // Number of colors in image

  if (p) {
    sscanf(p[0],"%*d%d%d", &height, &ncolors);
    if (ncolors < 0) data(p, height + 2);
    else data(p, height + ncolors + 1);
  }
}


void Fl_Pixmap::desaturate() {
  // Delete any existing pixmap/mask objects...
  uncache();

  // Allocate memory as needed...
  copy_data();

  // Update the colormap to grayscale...
  char          line[255];      // New colormap line
  int           i,              // Looping var
                ncolors,        // Number of colors in image
                chars_per_pixel;// Characters per color
  uchar         r, g, b;

  sscanf(data()[0],"%*d%*d%d%d", &ncolors, &chars_per_pixel);

  if (ncolors < 0) {
    // Update FLTK colormap...
    ncolors = -ncolors;
    uchar *cmap = (uchar *)(data()[1]);
    for (i = 0; i < ncolors; i ++, cmap += 4) {
      g = (uchar)((cmap[1] * 31 + cmap[2] * 61 + cmap[3] * 8) / 100);
      cmap[1] = cmap[2] = cmap[3] = g;
    }
  } else {
    // Update standard XPM colormap...
    for (i = 0; i < ncolors; i ++) {
      // look for "c word", or last word if none:
      const char *p = data()[i + 1] + chars_per_pixel + 1;
      const char *previous_word = p;
      for (;;) {
        while (*p && isspace(*p)) p++;
        char what = *p++;
        while (*p && !isspace(*p)) p++;
        while (*p && isspace(*p)) p++;
        if (!*p) {p = previous_word; break;}
        if (what == 'c') break;
        previous_word = p;
        while (*p && !isspace(*p)) p++;
      }

      if (fl_parse_color(p, r, g, b)) {
        g = (uchar)((r * 31 + g * 61 + b * 8) / 100);

        if (chars_per_pixel > 1) sprintf(line, "%c%c c #%02X%02X%02X", data()[i + 1][0],
                                         data()[i + 1][1], g, g, g);
        else sprintf(line, "%c c #%02X%02X%02X", data()[i + 1][0], g, g, g);

        delete[] (char *)data()[i + 1];
        ((char **)data())[i + 1] = new char[strlen(line) + 1];
        strcpy((char *)data()[i + 1], line);
      }
    }
  }
}

//
// End of "$Id: Fl_Pixmap.cxx 8190 2011-01-05 10:21:45Z manolo $".
//