samples/paper_bounds/PaperBounds.cpp

#include <cups/cups.h>
#include <cups/ppd.h>
#include <string>
#include <stdio.h>
#include <map>
#include <cairo/cairo.h>
#include <exception>
#include <math.h>
#include "CairoUtils.h"

using namespace std;


class Error: public exception
{
public:
  Error(const string& Message): exception(), Message_(Message) {}
  virtual ~Error() throw() {}
  virtual const char* what() const throw() { return Message_.c_str(); }
private:
  string Message_;
};

map <string, string> gPaperNames;
typedef pair<string, string> str_pair;

static int
GetPrinterResolution(ppd_group_t* group, int num_groups)
{
  for (int i = 0; i < num_groups; ++i)
  {
    ppd_group_t g = group[i];
    for (int j = 0; j < g.num_options; ++j)
    {
      ppd_option_t o = g.options[j];

      if (!strcmp(o.keyword, "Resolution"))
      {
        ppd_choice_t c = o.choices[0];

        return atoi(c.choice);
      }
    }
  }

  return 0;
}

static void
FindPapersOptions(ppd_option_t& o)
{
  if (!strcmp(o.keyword, "PageSize"))
  {
    for (int i = 0; i < o.num_choices; ++i)
    {
      ppd_choice_t& c = o.choices[i];

      gPaperNames.insert(str_pair(c.choice, c.text));
    }
  }
}

static void
FindPapersGroup(ppd_group_t& g)
{
  for (int i = 0; i < g.num_options; ++i)
    FindPapersOptions(g.options[i]);
}

static void
FindPapers(ppd_group_t* group, int num_groups)
{
  for (int i = 0; i < num_groups; ++i)
    FindPapersGroup(group[i]);
}


void
CreateBoundsImage(int Width, int Height, const string& Text, string& FileName, bool Landscape)
{
  FileName = "test.png";

  CairoSurfacePtr Surface(cairo_image_surface_create(CAIRO_FORMAT_RGB24, Width, Height));
  if (!*Surface)
    throw Error("Unable to create cairo surface");


  CairoPtr c(cairo_create(Surface));
  if (!*c)
    throw Error("Unable to create cairo_t");

  //setup Cairo
  cairo_set_antialias(c, CAIRO_ANTIALIAS_NONE);


  // clear image
  cairo_set_source_rgb(c, 1, 1, 1);
  cairo_paint(c);

  // draw rect
  cairo_set_source_rgb(c, 0, 0, 0);
  cairo_set_line_width(c, 3);
  cairo_rectangle(c, 3, 3, Width - 6, Height - 6);
  cairo_move_to(c, 3, 3);
  cairo_line_to(c, Width - 3, Height - 3);
  cairo_move_to(c, 3, Height - 3);
  cairo_line_to(c, Width - 3, 3);
  cairo_stroke(c);


  // draw text
  cairo_select_font_face(c, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
  cairo_set_source_rgb(c, 0, 0, 0);
  cairo_set_line_width(c, 1);

  cairo_text_extents_t te;
  for(int FontSize = 100; ;FontSize -= 10)
  {
    cairo_set_font_size(c, FontSize);

    cairo_text_extents(c, Text.c_str(), &te);

    if (Width > te.width)
      break;
  }

  //cairo_move_to(c, 10, 10);
  //cairo_show_text(c, "Hello");
  cairo_move_to(c, (Width - te.width) / 2, (Height + te.height) / 2);
  cairo_text_path(c, Text.c_str());

  cairo_stroke(c);

  // rotate if in Landscape to output always in portrait mode
  if (Landscape)
  {
      int w = Height;
      int h = Width;
      CairoSurfacePtr Surface2(cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h));
      if (!*Surface2)
          throw Error("Unable to create cairo surface");


      CairoPtr c2(cairo_create(Surface2));
      if (!*c2)
          throw Error("Unable to create cairo_t");

      cairo_translate(c2, w * 0.5, h * 0.5);
      cairo_rotate(c2, M_PI / 2.0);
      cairo_translate(c2, -h * 0.5, -w * 0.5);
      cairo_set_source_surface(c2, Surface, 0, 0);
      cairo_set_operator(c2, CAIRO_OPERATOR_SOURCE);
      cairo_paint(c2);

      if (cairo_surface_write_to_png(Surface2, FileName.c_str()) != CAIRO_STATUS_SUCCESS)
          throw Error("Unable to write to PNG file");
  }
  else
      // save to file
      if (cairo_surface_write_to_png(Surface, FileName.c_str()) != CAIRO_STATUS_SUCCESS)
          throw Error("Unable to write to PNG file");
}

int main(int argc, char** argv)
{
  try
  {
    if (argc < 2)
      throw Error("Usage: paperlist <PrinterName> [LabelType]");


  const char* ppdFileName = cupsGetPPD(argv[1]);
  if (!ppdFileName)
    throw Error(string("Unknown printer '") + argv[1] + "'");

  ppd_file_t* ppd = ppdOpenFile(ppdFileName);
  if (!ppd)
    throw Error(string("Unable to open ppd file '") + ppdFileName + "'");

  FindPapers(ppd->groups, ppd->num_groups);
  int Resolution = GetPrinterResolution(ppd->groups, ppd->num_groups);


  for (int i = 0; i < ppd->num_sizes; ++i)
  {
    int ch;
    ppd_size_t size = ppd->sizes[i];
    if (argc>=3)
    //printf("%s\n", gPaperNames[size.name].substr(0,5).c_str());
    if (argv[2]!=gPaperNames[size.name].substr(0,5))
        continue;

    printf("Please Insert '%s' paper. Press 'c' to continue, 's' to skip: ", gPaperNames[size.name].c_str());
    while((ch = getchar()) == '\n') {}
    //printf("\n");

    if (ch == 's')
      continue;
    if (ch == 'a')
      break;


    int Width = int((size.right - size.left) * Resolution / 72);
    int Height = int((size.top - size.bottom) * Resolution / 72);
    bool Landscape = false;

    string FileName;
    if (Height > Width)
    {
      Landscape = true;
      int t = Width;
      Width = Height;
      Height = t;
    }
    CreateBoundsImage(Width, Height, gPaperNames[size.name], FileName, Landscape);

    int             num_options = 0;
    cups_option_t*  options = NULL;

    num_options = cupsAddOption("PageSize", size.name, num_options, &options);
    num_options = cupsAddOption("scaling", "100", num_options, &options);
    if (Landscape)
      num_options = cupsAddOption("landscape", "no", num_options, &options);
      //num_options = cupsAddOption("orientation-requested", "4", num_options, &options);


    cupsPrintFile(argv[1], FileName.c_str(), "Test print with Cairo", num_options, options);

    cupsFreeOptions(num_options, options);
  }


  ppdClose(ppd);

  return 0;
  }
  catch(std::exception& e)
  {
    fprintf(stderr, e.what());
    fprintf(stderr, "\n");
    return 1;
  }
}