path: root/src/Fl_Pixmap.cxx

//
// Pixmap drawing code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2022 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:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.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/platform.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Menu_Item.H>
#include <FL/Fl_Pixmap.H>

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

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);
    cache_w_ = cache_h_ = 0;
  }
}

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

/**
  The destructor frees all memory and server resources that are used by
  the pixmap.
*/
Fl_Pixmap::~Fl_Pixmap() {
  uncache();
  delete_data();
}

void Fl_Pixmap::uncache() {
  if (id_) {
    Fl_Graphics_Driver::default_driver().uncache_pixmap(id_);
    id_ = 0;
  }

  if (mask_) {
    Fl_Graphics_Driver::default_driver().delete_bitmask(mask_);
    mask_ = 0;
  }
}

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

void Fl_Pixmap::label(Fl_Menu_Item* m) {
  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 * data_w() + 1;

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

Fl_Image *Fl_Pixmap::copy(int W, int H) {
  Fl_Pixmap     *new_image;     // New pixmap
  if (!data()) { // happens with bad pixmap data
    return new Fl_Pixmap((char *const*)0);
  }
  // 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();
    new_image->scale(W, H, 0, 1);
    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 Bresenham step/modulus values...
  xmod   = data_w() % W;
  xstep  = (data_w() / W) * chars_per_pixel;
  ymod   = data_h() % H;
  ystep  = data_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);
      }
    }
  }
}