//========================================================================
//
// SplashFontEngine.cpp
//
//========================================================================

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <stdlib.h>
#include <stdio.h>
#ifndef WIN32
#  include <unistd.h>
#endif
#include "gmem.h"
#include "GString.h"
#include "SplashMath.h"
#include "SplashFTFontEngine.h"
#include "SplashFontFile.h"
#include "SplashFontFileID.h"
#include "SplashFont.h"
#include "SplashFontEngine.h"

#ifdef VMS
#if (__VMS_VER < 70000000)
extern "C" int unlink(char *filename);
#endif
#endif

//------------------------------------------------------------------------
// SplashFontEngine
//------------------------------------------------------------------------

SplashFontEngine::SplashFontEngine(
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
				   GBool enableFreeType,
#endif
				   GBool aa) {
  int i;

  for (i = 0; i < splashFontCacheSize; ++i) {
    fontCache[i] = NULL;
  }

#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (enableFreeType) {
    ftEngine = SplashFTFontEngine::init(aa);
  } else {
    ftEngine = NULL;
  }
#endif
}

SplashFontEngine::~SplashFontEngine() {
  int i;

  for (i = 0; i < splashFontCacheSize; ++i) {
    if (fontCache[i]) {
      delete fontCache[i];
    }
  }

#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (ftEngine) {
    delete ftEngine;
  }
#endif
}

SplashFontFile *SplashFontEngine::getFontFile(SplashFontFileID *id) {
  SplashFontFile *fontFile;
  int i;

  for (i = 0; i < splashFontCacheSize; ++i) {
    if (fontCache[i]) {
      fontFile = fontCache[i]->getFontFile();
      if (fontFile && fontFile->getID()->matches(id)) {
	return fontFile;
      }
    }
  }
  return NULL;
}

SplashFontFile *SplashFontEngine::loadType1Font(SplashFontFileID *idA,
						SplashFontSrc *src,
						char **enc) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadType1Font(idA, src, enc);
  }
#endif

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFontFile *SplashFontEngine::loadType1CFont(SplashFontFileID *idA,
						 SplashFontSrc *src,
						 char **enc) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadType1CFont(idA, src, enc);
  }
#endif

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFontFile *SplashFontEngine::loadOpenTypeT1CFont(SplashFontFileID *idA,
						      SplashFontSrc *src,
						      char **enc) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadOpenTypeT1CFont(idA, src, enc);
  }
#endif

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFontFile *SplashFontEngine::loadCIDFont(SplashFontFileID *idA,
					      SplashFontSrc *src) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadCIDFont(idA, src);
  }
#endif

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFontFile *SplashFontEngine::loadOpenTypeCFFFont(SplashFontFileID *idA,
						      SplashFontSrc *src) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadOpenTypeCFFFont(idA, src);
  }
#endif

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFontFile *SplashFontEngine::loadTrueTypeFont(SplashFontFileID *idA,
						   SplashFontSrc *src,
						   Gushort *codeToGID,
						   int codeToGIDLen,
						   int faceIndex) {
  SplashFontFile *fontFile;

  fontFile = NULL;
#if HAVE_FREETYPE_FREETYPE_H || HAVE_FREETYPE_H
  if (!fontFile && ftEngine) {
    fontFile = ftEngine->loadTrueTypeFont(idA, src,
					  codeToGID, codeToGIDLen, faceIndex);
  }
#endif

  if (!fontFile) {
    gfree(codeToGID);
  }

  // delete the (temporary) font file -- with Unix hard link
  // semantics, this will remove the last link; otherwise it will
  // return an error, leaving the file to be deleted later (if
  // loadXYZFont failed, the file will always be deleted)
  if (src->isFile)
    src->unref();

  return fontFile;
}

SplashFont *SplashFontEngine::getFont(SplashFontFile *fontFile,
				      SplashCoord *textMat,
				      SplashCoord *ctm) {
  SplashCoord mat[4];
  SplashFont *font;
  int i, j;

  mat[0] = textMat[0] * ctm[0] + textMat[1] * ctm[2];
  mat[1] = -(textMat[0] * ctm[1] + textMat[1] * ctm[3]);
  mat[2] = textMat[2] * ctm[0] + textMat[3] * ctm[2];
  mat[3] = -(textMat[2] * ctm[1] + textMat[3] * ctm[3]);
  if (splashAbs(mat[0] * mat[3] - mat[1] * mat[2]) < 0.01) {
    // avoid a singular (or close-to-singular) matrix
    mat[0] = 0.01;  mat[1] = 0;
    mat[2] = 0;     mat[3] = 0.01;
  }

  font = fontCache[0];
  if (font && font->matches(fontFile, mat, textMat)) {
    return font;
  }
  for (i = 1; i < splashFontCacheSize; ++i) {
    font = fontCache[i];
    if (font && font->matches(fontFile, mat, textMat)) {
      for (j = i; j > 0; --j) {
	fontCache[j] = fontCache[j-1];
      }
      fontCache[0] = font;
      return font;
    }
  }
  font = fontFile->makeFont(mat, textMat);
  if (fontCache[splashFontCacheSize - 1]) {
    delete fontCache[splashFontCacheSize - 1];
  }
  for (j = splashFontCacheSize - 1; j > 0; --j) {
    fontCache[j] = fontCache[j-1];
  }
  fontCache[0] = font;
  return font;
}