/*
 * WinClipboard Win32 Windoze Copy&Paste Plug-in
 * Copyright (C) 1999 Hans Breuer
 * Hans Breuer, Hans@Breuer.org
 * 08/07/99
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Based on (at least) the following plug-ins:
 *  Header
 *  WinSnap
 *
 * Any suggestions, bug-reports or patches are welcome.
 */

#include "config.h"

#include <windows.h>
#include <stdlib.h>

#include <libgimp/gimp.h>

#include "libgimp/stdplugins-intl.h"


/* History:
 *
 *   08/07/99 Implementation and release.
 *	 08/10/99 Big speed increase by using gimp_tile_cache_size()
 *			  Thanks to Kevin Turner's documentation at:
 *			  http://www.poboxes.com/kevint/gimp/doc/plugin-doc-2.1.html
 *
 * TODO (maybe):
 *
 *   - Support for 4,2,1 bit bitmaps
 *   - Unsupported formats could be delegated to GIMP Loader (e.g. wmf)
 *   - ...
 */

/* How many steps the progress control should do
 */
#define PROGRESS_STEPS 25
#define StepProgress(one,all) \
	(0 == (one % ((all / PROGRESS_STEPS)+1)))

/* FIXME: I'll use -1 as IMAGE_NONE. Is it correct ???
 */
#define IMAGE_NONE -1

/* Declare some local functions.
 */
static void   query      (void);
static void   run        (const gchar      *name,
                          gint              nparams,
                          const GimpParam  *param,
                          gint             *nreturn_vals,
                          GimpParam       **return_vals);

/* Plugin function prototypes
 */
static int CB_CopyImage (gboolean    interactive,
			 gint32      image_ID,
			 gint32      drawable_ID);

static int CB_PasteImage (gboolean   interactive,
			  gint32     image_ID,
			  gint32     drawable_ID);


GimpPlugInInfo PLUG_IN_INFO =
{
  NULL,  /* init_proc  */
  NULL,  /* quit_proc  */
  query, /* query_proc */
  run,   /* run_proc   */
};


MAIN ()

static void
query ()
{
  static GimpParamDef copy_args[] =
  {
    { GIMP_PDB_INT32,    "run_mode", "Interactive, non-interactive" },
    { GIMP_PDB_IMAGE,    "image",    "Input image"                  },
    { GIMP_PDB_DRAWABLE, "drawable", "Drawable to save"             }
  };

  gimp_install_procedure ("plug_in_clipboard_copy",
                          "copy image to clipboard",
                          "Copies the active drawable to the clipboard.",
                          "Hans Breuer",
                          "Hans Breuer",
                          "1999",
                          N_("Copy to Clipboard"),
                          "INDEXED*, RGB*, GRAY*",
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (copy_args), 0,
                          copy_args, NULL);

  gimp_install_procedure ("plug_in_clipboard_paste",
                          "paste image from clipboard",
                          "Paste image from clipboard into active image.",
                          "Hans Breuer",
                          "Hans Breuer",
                          "1999",
                          N_("Paste from Clipboard"),
                          "INDEXED*, RGB*, GRAY*",
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (copy_args), 0,
                          copy_args, NULL);

  gimp_install_procedure ("plug_in_clipboard_paste_as_new",
                          "Get image from clipboard",
                          "Get an image from the Windows clipboard, creating a new image",
                          "Hans Breuer",
                          "Hans Breuer",
                          "1999",
                          N_("From Clipboard"),
                          "",
                          GIMP_PLUGIN,
                          1, 0,
                          copy_args, NULL);

  gimp_plugin_menu_register ("plug_in_clipboard_copy",
                             "<Image>/Edit");
  gimp_plugin_menu_register ("plug_in_clipboard_paste",
                             "<Image>/Edit");
  gimp_plugin_menu_register ("plug_in_clipboard_paste_as_new",
                             "<Toolbox>/File/Acquire");
}

static void
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
{
  static GimpParam values[2];
  GimpRunMode run_mode;

  run_mode = param[0].data.d_int32;

  *nreturn_vals = 1;
  *return_vals = values;
  values[0].type = GIMP_PDB_STATUS;
  values[0].data.d_status = GIMP_PDB_CALLING_ERROR;

  INIT_I18N();

  if (strcmp (name, "plug_in_clipboard_copy") == 0)
    {
      *nreturn_vals = 1;
      if (CB_CopyImage (GIMP_RUN_INTERACTIVE==run_mode,
			param[1].data.d_int32,
			param[2].data.d_int32))
	values[0].data.d_status = GIMP_PDB_SUCCESS;
      else
	values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
    }
  else if (strcmp (name, "plug_in_clipboard_paste") == 0)
    {
      *nreturn_vals = 1;
      if (CB_PasteImage (GIMP_RUN_INTERACTIVE==run_mode,
			 param[1].data.d_int32,
			 param[2].data.d_int32))
	values[0].data.d_status = GIMP_PDB_SUCCESS;
      else
	values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
    }
  else if (strcmp (name, "plug_in_clipboard_paste_as_new") == 0)
    {
      *nreturn_vals = 1;
      if (CB_PasteImage (GIMP_RUN_INTERACTIVE==run_mode,
			 IMAGE_NONE,
			 IMAGE_NONE))
	values[0].data.d_status = GIMP_PDB_SUCCESS;
      else
	values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
    }
}

/* Plugin Function implementation
 */
static int
CB_CopyImage (gboolean interactive,
	      gint32   image_ID,
	      gint32   drawable_ID)
{
  GimpDrawable *drawable;
  GimpImageType drawable_type;
  GimpPixelRgn pixel_rgn;
  gchar *sStatus = NULL;

  int nSizeDIB=0;
  int nSizePal=0;
  int nSizeLine=0; /* DIB lines are 32 bit aligned */

  HANDLE hDIB;
  BOOL bRet;

  drawable = gimp_drawable_get (drawable_ID);
  drawable_type = gimp_drawable_type (drawable_ID);
  gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width, drawable->height, FALSE, FALSE);

  /* allocate room for DIB */
  if (GIMP_INDEXED_IMAGE == drawable_type || GIMP_GRAY_IMAGE == drawable_type)
    {
      nSizeLine = ((drawable->width-1)/4+1)*4;
      nSizeDIB = sizeof(RGBQUAD) * 256 /* always full color map size */
	+ nSizeLine * drawable->height
	+ sizeof (BITMAPINFOHEADER);
    }
  else
    {
      nSizeLine = ((drawable->width*3-1)/4+1)*4;
      nSizeDIB = nSizeLine * drawable->height
	+ sizeof (BITMAPINFOHEADER);
    }

  hDIB = GlobalAlloc (GMEM_MOVEABLE | GMEM_DDESHARE, nSizeDIB);
  if (NULL == hDIB)
    {
      g_message ("Failed to allocate DIB");
      bRet = FALSE;
    }

  /* fill header info */
  if (bRet)
    {
      BITMAPINFOHEADER *pInfo;

      bRet = FALSE;
      pInfo = GlobalLock (hDIB);
      if (pInfo)
	{
	  pInfo->biSize   = sizeof(BITMAPINFOHEADER);
	  pInfo->biWidth  = drawable->width;
	  pInfo->biHeight = drawable->height;
	  pInfo->biPlanes = 1;
	  pInfo->biBitCount = 
	    (GIMP_INDEXED_IMAGE == drawable_type || GIMP_GRAY_IMAGE == drawable_type ? 8 : 24);
	  pInfo->biCompression = BI_RGB; /* none */
	  pInfo->biSizeImage = 0; /* not calculated/needed */
	  pInfo->biXPelsPerMeter =
	    pInfo->biYPelsPerMeter = 0;
	  /* color map size */
	  pInfo->biClrUsed = 
	    (GIMP_INDEXED_IMAGE == drawable_type || GIMP_GRAY_IMAGE == drawable_type ? 256 : 0);
	  pInfo->biClrImportant = 0; /* all */

	  GlobalUnlock (hDIB);
	  bRet = TRUE;
	} /* (pInfo) */
      else
	g_message("Failed to lock DIB Header");
    }

  /* fill color map */
  if (bRet && (GIMP_INDEXED_IMAGE == drawable_type  || GIMP_GRAY_IMAGE == drawable_type))
    {
      char *pBmp;

      bRet = FALSE;
      pBmp = GlobalLock (hDIB);
      if (pBmp)
	{
	  RGBQUAD *pPal;
	  int nColors;
	  unsigned char *cmap = NULL;
	  pPal = (RGBQUAD*)(pBmp + sizeof(BITMAPINFOHEADER));
	  nSizePal = sizeof(RGBQUAD) * 256;

	  /* get the gimp colormap */
	  if (GIMP_GRAY_IMAGE != drawable_type)
	    cmap = gimp_image_get_colormap (image_ID, &nColors);

	  if (cmap)
	    {
	      int i;
	      for (i = 0; (i < 256) && (i < nColors); i++)
		{
		  pPal[i].rgbReserved = 0; /* is this alpha? */
		  pPal[i].rgbRed      = cmap[3*i];
		  pPal[i].rgbGreen    = cmap[3*i+1];
		  pPal[i].rgbBlue     = cmap[3*i+2];
		}

	      g_free(cmap);
	      bRet = TRUE;
	    } /* (cmap) */
	  else if (GIMP_GRAY_IMAGE == drawable_type)
	    {
	      /* fill with identity palette */
	      int i;
	      for (i = 0; (i < 256) && (i < nColors); i++)
		{
		  pPal[i].rgbReserved = 0; /* is this alpha? */
		  pPal[i].rgbRed      = i;
		  pPal[i].rgbGreen    = i;
		  pPal[i].rgbBlue     = i;
		}

	      bRet = TRUE;
	    }
	  else
	    g_message ("Can't get color map");
	  GlobalUnlock (hDIB);
	} /* (pBmp) */
      else
	g_message ("Failed to lock DIB Palette");
    } /* indexed or grayscale */

  /* following the slow part ... */
  if (interactive)
    gimp_progress_init (_("Copying..."));

  /* speed it up with: */
  gimp_tile_cache_size (drawable->width * gimp_tile_height () * drawable->bpp);

  /* copy data to DIB */
  if (bRet)
    {
      unsigned char *pData;

      bRet = FALSE;
      pData = GlobalLock (hDIB);

      if (pData)
	{
	  unsigned char *pLine;

	  /* calculate real offset */
	  pData += (sizeof(BITMAPINFOHEADER) + nSizePal);

	  pLine = g_new (guchar, drawable->width * drawable->bpp);

	  if (GIMP_INDEXED_IMAGE == drawable_type || GIMP_GRAY_IMAGE == drawable_type)
	    {
	      int x, y;
	      for (y = 0; y < drawable->height; y++)
		{
		  if ((interactive) && (StepProgress(y,drawable->height)))
		    gimp_progress_update ((double)y / drawable->height);

		  gimp_pixel_rgn_get_row (&pixel_rgn, pLine, 0,
					  drawable->height-y-1, /* invert it */
					  drawable->width);
		  for (x = 0; x < drawable->width; x++)
		    pData[x+y*nSizeLine] = pLine[x*drawable->bpp];
		}
	    }
	  else
	    {
	      int x, y;
	      for (y = 0; y < drawable->height; y++)
		{
		  if ((interactive) && (StepProgress(y,drawable->height)))
		    gimp_progress_update ((double)y / drawable->height);

		  gimp_pixel_rgn_get_row (&pixel_rgn, pLine, 0,
					  drawable->height-y-1, /* invert it */
					  drawable->width);
		  for (x = 0; x < drawable->width; x++)
		    {
		      /* RGBQUAD: blue, green, red, reserved */
		      pData[x*3+y*nSizeLine]   = pLine[x*drawable->bpp+2]; /* blue */
		      pData[x*3+y*nSizeLine+1] = pLine[x*drawable->bpp+1]; /* green */
		      pData[x*3+y*nSizeLine+2] = pLine[x*drawable->bpp];   /* red */
		      /*pData[x+y*drawable->width*3+3] = 0;*/          /* reserved */
		    }
		}
	    }

	  g_free (pLine);
	  bRet = TRUE;

	  GlobalUnlock (hDIB);
	} /* (pData) */
      else
	g_message("Failed to lock DIB Data");
    } /* copy data to DIB */

  /* copy DIB to ClipBoard */
  if (bRet)
    {
      if (!OpenClipboard (NULL))
	{
	  g_message ("Cannot open the Clipboard!");
	  bRet = FALSE;
	}
      else
	{
	  if (bRet && !EmptyClipboard ())
	    {
	      g_message ("Cannot empty the Clipboard");
	      bRet = FALSE;
	    }
	  if (bRet)
	    {
	      if (NULL != SetClipboardData (CF_DIB, hDIB))
		hDIB = NULL; /* data now owned by clipboard */
	      else
		g_message ("Failed to set clipboard data ");
	    }

	  if (!CloseClipboard ())
	    g_message ("Failed to close Clipboard");
	}
    }
  /* done */
  if (hDIB)
    GlobalFree(hDIB);

  gimp_drawable_detach (drawable);

  return bRet;
} /* CB_CopyImage */

static void
decompose_mask (guint32  mask,
		gint    *shift,
		gint    *prec)
{
  *shift = 0;
  *prec = 0;

  while (!(mask & 0x1))
    {
      (*shift)++;
      mask >>= 1;
    }

  while (mask & 0x1)
    {
      (*prec)++;
      mask >>= 1;
    }
}

static int
CB_PasteImage (gboolean interactive,
			   gint32   image_ID,
			   gint32   drawable_ID)
{
  UINT fmt;
  BOOL bRet=TRUE;
  HANDLE hDIB;
  BITMAPINFO *pInfo;
  gint32 nWidth  = 0;
  gint32 nHeight = 0;
  gint32 nBitsPS = 0;
  gint32 nColors = 0;
  guint32 maskR;
  guint32 maskG;
  guint32 maskB;
  gint shiftR;
  gint shiftG;
  gint shiftB;
  gint precR;
  gint precG;
  gint precB;
  gint maxR;
  gint maxG;
  gint maxB;

  if (!OpenClipboard (NULL))
    {
      g_message("Failed to open clipboard");
      return FALSE;
    }

  fmt = EnumClipboardFormats (0);
  while ((CF_BITMAP != fmt) && (CF_DIB != fmt) && (0 != fmt))
    fmt = EnumClipboardFormats (fmt);

  if (0 == fmt)
    {
      g_message (_("Unsupported format or Clipboard empty!"));
      bRet = FALSE;
    }

  /* there is something supported */
  if (bRet)
    {
      hDIB = GetClipboardData (CF_DIB);

      if (NULL == hDIB)
	{
	  g_message (_("Can't get Clipboard data."));
	  bRet = FALSE;
	}
    }

  /* read header */
  if (bRet && hDIB)
    {
      pInfo = GlobalLock (hDIB);
      if (NULL == pInfo)
	{
	  g_message ("Can't lock Clipboard data!");
	  bRet = FALSE;
	}

      if (bRet && pInfo->bmiHeader.biCompression == BI_BITFIELDS)
	{
	  maskR = ((DWORD *)pInfo->bmiColors)[0];
	  maskG = ((DWORD *)pInfo->bmiColors)[1];
	  maskB = ((DWORD *)pInfo->bmiColors)[2];
	  decompose_mask (maskR, &shiftR, &precR);
	  maxR = (1 << precR) - 1;
	  decompose_mask (maskG, &shiftG, &precG);
	  maxG = (1 << precG) - 1;
	  decompose_mask (maskB, &shiftB, &precB);
	  maxB = (1 << precB) - 1;
	}

      if ((bRet) &&
	  ((pInfo->bmiHeader.biSize != sizeof(BITMAPINFOHEADER)
	    || (pInfo->bmiHeader.biCompression != BI_RGB
		&& pInfo->bmiHeader.biCompression != BI_BITFIELDS))))
	{
	  g_message ("Unsupported bitmap format (%d)!",
		     pInfo->bmiHeader.biCompression);
	  bRet = FALSE;
	}

      if (bRet && pInfo)
	{
	  nWidth  = pInfo->bmiHeader.biWidth;
	  nHeight = pInfo->bmiHeader.biHeight;
	  nBitsPS = pInfo->bmiHeader.biBitCount;
	  nColors = pInfo->bmiHeader.biClrUsed;
	}
    }

  if ((0 != nWidth) && (0 != nHeight))
    {
      GimpDrawable *drawable;
      GimpPixelRgn pixel_rgn;
      guchar *pData;
      GimpParam *params;
      gint retval;
      gboolean bIsNewImage = TRUE;
      gint oldBPP = 0;
      guchar *pLine;
      RGBQUAD *pPal;
      const int nSizeLine = ((nWidth*(nBitsPS/8)-1)/4+1)*4;

      /* Check if clipboard data and existing image are compatible */
      if (IMAGE_NONE != drawable_ID)
	{
	  drawable = gimp_drawable_get (drawable_ID);
	  oldBPP = drawable->bpp;
	  gimp_drawable_detach (drawable);
	}

      if ((IMAGE_NONE == image_ID)
	  || (3 != oldBPP) || (24 != nBitsPS))
	{
	  /* create new image */
	  image_ID = gimp_image_new (nWidth, nHeight, nBitsPS <= 8 ? GIMP_INDEXED : GIMP_RGB);
	  gimp_image_undo_disable(image_ID);
	  drawable_ID = gimp_layer_new (image_ID, _("Background"), nWidth, nHeight,
					nBitsPS <= 8 ? GIMP_INDEXED_IMAGE : GIMP_RGB_IMAGE,
					100, GIMP_NORMAL_MODE);
	}
      else
	{
	  /* ??? gimp_image_convert_rgb (image_ID);
	   */
	  drawable_ID = gimp_layer_new (image_ID, _("Pasted"), nWidth, nHeight,
					nBitsPS <= 8 ? GIMP_INDEXEDA_IMAGE : GIMP_RGBA_IMAGE,
					100, GIMP_NORMAL_MODE);
	  bIsNewImage = FALSE;
	}

      gimp_image_add_layer (image_ID, drawable_ID, -1);
      drawable = gimp_drawable_get (drawable_ID);

      gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width, drawable->height, FALSE, FALSE);

      /* following the slow part ... */
      if (interactive)
	gimp_progress_init (_("Pasting..."));

      /* adjust pointer */
      pPal  = pInfo->bmiColors;
      if (pInfo->bmiHeader.biCompression == BI_BITFIELDS)
        pData = (guchar*)pPal + sizeof(DWORD) * 3;
      else
        pData = (guchar*)pPal + sizeof(RGBQUAD) * nColors;

      /* create palette */
      if (0 != nColors)
	{
	  int c;
	  guchar *cmap;

	  cmap = g_new (guchar, nColors*3);
	  for (c = 0; c < nColors; c++)
	    {
	      cmap[c*3]   = pPal[c].rgbRed;
	      cmap[c*3+1] = pPal[c].rgbGreen;
	      cmap[c*3+2] = pPal[c].rgbBlue;
	    }
	  gimp_image_set_colormap (image_ID, cmap, nColors);
	  g_free (cmap);
	}

      /* speed it up with: */
      gimp_tile_cache_size (drawable->width * gimp_tile_height () * drawable->bpp );

      /* change data format and copy data */
      if ((24 == nBitsPS && pInfo->bmiHeader.biCompression == BI_RGB)
	  || (pInfo->bmiHeader.biCompression == BI_BITFIELDS))
	{
	  int y;
	  const int bps = nBitsPS / 8;
	  pLine = g_new (guchar, drawable->width*drawable->bpp);

	  for (y = 0; y < drawable->height; y++)
	    {
	      int x;

	      if ((interactive) && (StepProgress (y, drawable->height)))
		gimp_progress_update ((double)y / drawable->height);

	      if (pInfo->bmiHeader.biCompression == BI_RGB)
		for (x = 0; x < drawable->width; x++)
		  {
		    pLine[x*drawable->bpp]   = pData[y*nSizeLine+x*bps+2];
		    pLine[x*drawable->bpp+1] = pData[y*nSizeLine+x*bps+1];
		    pLine[x*drawable->bpp+2] = pData[y*nSizeLine+x*bps];
		    if (drawable->bpp == 4)
		      pLine[x*drawable->bpp+3] = 255;
		  }
	      else
		for (x = 0; x < drawable->width; x++)
		  {
		    guint dw;

		    if (nBitsPS == 32)
		      dw = *((DWORD *)(pData + y*nSizeLine + x*4));
		    else
		      dw = *((WORD *)(pData + y*nSizeLine + x*2));
		    pLine[x*drawable->bpp]   = (255 * ((dw & maskR) >> shiftR)) / maxR;
		    pLine[x*drawable->bpp+1] = (255 * ((dw & maskG) >> shiftG)) / maxG;
		    pLine[x*drawable->bpp+2] = (255 * ((dw & maskB) >> shiftB)) / maxB;
		    if (drawable->bpp == 4)
		      pLine[x*drawable->bpp+3] = 255;
		  }

	      /* copy data to GIMP */
	      gimp_pixel_rgn_set_rect (&pixel_rgn, pLine, 0, drawable->height-1-y, drawable->width, 1);
	    }
	  g_free (pLine);
	}
      else if (8 == nBitsPS)
	{
	  int y;
	  /* copy line by line */
	  /* This will only be reached for new images, so no need for alpha */
	  for (y = 0; y < drawable->height; y++)
	    {
	      if ((interactive) && (StepProgress (y, drawable->height)))
		gimp_progress_update ((double)y / drawable->height);

	      pLine = pData + y*nSizeLine; /* adjust pointer */
	      gimp_pixel_rgn_set_row (&pixel_rgn, pLine, 0, drawable->height-1-y, drawable->width);
	    }
	}
      else
	{
	  /* copy and shift bits */
	  g_message ("%d bits per sample not yet supported!", nBitsPS);
	}

      gimp_drawable_flush (drawable);
      gimp_drawable_detach (drawable);

      /* Don't forget to display the new image! */
      if (bIsNewImage)
	gimp_display_new (image_ID);
      else
	{
	  gimp_drawable_set_visible (drawable_ID, TRUE);
	  gimp_displays_flush ();
	}
    }

  /* done */
  /* clear clipboard? */
  if (NULL != hDIB)
    {
      GlobalUnlock (pInfo);
      GlobalFree (hDIB);
    }

  CloseClipboard ();

  /* shouldn't this be done by caller?? */
  if (!gimp_image_undo_is_enabled (image_ID))
    gimp_image_undo_enable (image_ID);

  return bRet;
} /* CB_PasteImage */