/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

/*

 * (C) Copyright IBM Corp. 1998-2001 - All Rights Reserved

 *

 * The original version of this source code and documentation is

 * copyrighted and owned by IBM. These materials are provided

 * under terms of a License Agreement between IBM and Sun.

 * This technology is protected by multiple US and International

 * patents. This notice and attribution to IBM may not be removed.

 */

#include "FontInstanceAdapter.h"

FontInstanceAdapter::FontInstanceAdapter(JNIEnv *theEnv,

                                         jobject theFont2D,

                                         jobject theFontStrike,

                                         float *matrix,

                                         le_int32 xRes, le_int32 yRes,

                                         le_int32 theUPEM,

                                         TTLayoutTableCache *ltables)

    : env(theEnv), font2D(theFont2D), fontStrike(theFontStrike),

      xppem(0), yppem(0),

      xScaleUnitsToPoints(0), yScaleUnitsToPoints(0),

      xScalePixelsToUnits(0), yScalePixelsToUnits(0),

      upem(theUPEM), layoutTables(ltables)

{

    xPointSize = euclidianDistance(matrix[0], matrix[1]);

    yPointSize = euclidianDistance(matrix[2], matrix[3]);

    txMat[0] = matrix[0]/xPointSize;

    txMat[1] = matrix[1]/xPointSize;

    txMat[2] = matrix[2]/yPointSize;

    txMat[3] = matrix[3]/yPointSize;

    xppem = ((float) xRes / 72) * xPointSize;

    yppem = ((float) yRes / 72) * yPointSize;

    xScaleUnitsToPoints = xPointSize / upem;

    yScaleUnitsToPoints = yPointSize / upem;

    xScalePixelsToUnits = upem / xppem;

    yScalePixelsToUnits = upem / yppem;

};

const void *FontInstanceAdapter::getFontTable(LETag tableTag) const

{

  if (!layoutTables) { // t1 font

    return 0;

  }

  // cache in font's pscaler object

  // font disposer will handle for us

  switch(tableTag) {

  case GSUB_TAG: if (layoutTables->gsub_len != -1) return (void*)layoutTables->gsub; break;

  case GPOS_TAG: if (layoutTables->gpos_len != -1) return (void*)layoutTables->gpos; break;

  case GDEF_TAG: if (layoutTables->gdef_len != -1) return (void*)layoutTables->gdef; break;

  case MORT_TAG: if (layoutTables->mort_len != -1) return (void*)layoutTables->mort; break;

  case KERN_TAG: if (layoutTables->kern_len != -1) return (void*)layoutTables->kern; break;

  default:

   //fprintf(stderr, "unexpected table request from font instance adapter: %x\n", tableTag);

    return 0;

  }

  jbyte* result = 0;

  jsize  len = 0;

  jbyteArray tableBytes = (jbyteArray)

    env->CallObjectMethod(font2D, sunFontIDs.getTableBytesMID, tableTag);

  if (!IS_NULL(tableBytes)) {

    len = env->GetArrayLength(tableBytes);

    result = new jbyte[len];

    env->GetByteArrayRegion(tableBytes, 0, len, result);

  }

  switch(tableTag) {

  case GSUB_TAG: layoutTables->gsub = (void*)result; layoutTables->gsub_len = len; break;

  case GPOS_TAG: layoutTables->gpos = (void*)result; layoutTables->gpos_len = len; break;

  case GDEF_TAG: layoutTables->gdef = (void*)result; layoutTables->gdef_len = len; break;

  case MORT_TAG: layoutTables->mort = (void*)result; layoutTables->mort_len = len; break;

  case KERN_TAG: layoutTables->kern = (void*)result; layoutTables->kern_len = len; break;

  default: break;

  }

  return (void*)result;

};

LEGlyphID FontInstanceAdapter::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const

{

    LEUnicode32 mappedChar = mapper->mapChar(ch);

    if (mappedChar == 0xFFFF || mappedChar == 0xFFFE) {

        return 0xFFFF;

    }

    if (mappedChar == 0x200C || mappedChar == 0x200D) {

        return 1;

    }

    LEGlyphID id = (LEGlyphID)env->CallIntMethod(font2D, sunFontIDs.f2dCharToGlyphMID, (jint)mappedChar);

    return id;

}

LEGlyphID FontInstanceAdapter::mapCharToGlyph(LEUnicode32 ch) const

{

    LEGlyphID id = (LEGlyphID)env->CallIntMethod(font2D, sunFontIDs.f2dCharToGlyphMID, ch);

    return id;

}

void FontInstanceAdapter::mapCharsToWideGlyphs(const LEUnicode chars[],

    le_int32 offset, le_int32 count, le_bool reverse,

    const LECharMapper *mapper, le_uint32 glyphs[]) const

{

    le_int32 i, out = 0, dir = 1;

    if (reverse) {

        out = count - 1;

        dir = -1;

    }

    for (i = offset; i < offset + count; i += 1, out += dir) {

                LEUnicode16 high = chars[i];

                LEUnicode32 code = high;

                if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {

                        LEUnicode16 low = chars[i + 1];

                        if (low >= 0xDC00 && low <= 0xDFFF) {

                                code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;

                        }

                }

        glyphs[out] = mapCharToWideGlyph(code, mapper);

                if (code >= 0x10000) {

                        i += 1;

                        glyphs[out += dir] = 0xFFFF;

                }

    }

}

le_uint32 FontInstanceAdapter::mapCharToWideGlyph(LEUnicode32 ch, const LECharMapper *mapper) const

{

    LEUnicode32 mappedChar = mapper->mapChar(ch);

    if (mappedChar == 0xFFFF) {

        return 0xFFFF;

    }

    if (mappedChar == 0x200C || mappedChar == 0x200D) {

        return 1;

    }

    return (LEGlyphID)env->CallIntMethod(font2D, sunFontIDs.charToGlyphMID,

                                         mappedChar);

}

void FontInstanceAdapter::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const

{

    getWideGlyphAdvance((le_uint32)glyph, advance);

}

void FontInstanceAdapter::getKerningAdjustment(LEPoint &adjustment) const

{

    float xx, xy, yx, yy;

    le_bool isIdentityMatrix;

    isIdentityMatrix = (txMat[0] == 1 && txMat[1] == 0 &&

                        txMat[2] == 0 && txMat[3] == 1);

    if (!isIdentityMatrix) {

      xx = adjustment.fX;

      xy = xx * txMat[1];

      xx = xx * txMat[0];

      yy = adjustment.fY;

      yx = yy * txMat[2];

      yy = yy * txMat[3];

      adjustment.fX = xx + yx;

      adjustment.fY = xy + yy;

    }

    jobject pt = env->NewObject(sunFontIDs.pt2DFloatClass,

                                sunFontIDs.pt2DFloatCtr,

                                adjustment.fX, adjustment.fY);

    env->CallObjectMethod(fontStrike, sunFontIDs.adjustPointMID, pt);

    adjustment.fX = env->GetFloatField(pt, sunFontIDs.xFID);

    adjustment.fY = env->GetFloatField(pt, sunFontIDs.yFID);

}

void FontInstanceAdapter::getWideGlyphAdvance(le_uint32 glyph, LEPoint &advance) const

{

    if ((glyph & 0xfffe) == 0xfffe) {

        advance.fX = 0;

        advance.fY = 0;

        return;

    }

    jobject pt = env->CallObjectMethod(fontStrike,

                                       sunFontIDs.getGlyphMetricsMID, glyph);

    if (pt != NULL) {

        advance.fX = env->GetFloatField(pt, sunFontIDs.xFID);

        advance.fY = env->GetFloatField(pt, sunFontIDs.yFID);

    }

}

le_bool FontInstanceAdapter::getGlyphPoint(LEGlyphID glyph,

                                           le_int32 pointNumber,

                                           LEPoint &point) const

{

  /* This upcall is not ideal, since it will make another down call.

   * The intention is to move up some of this code into Java. But

   * a HashMap has been added to the Java PhysicalStrike object to cache

   * these points so that they don't need to be repeatedly recalculated

   * which is expensive as it needs the font scaler to re-generate the

   * hinted glyph outline. This turns out to be a huge win over 1.4.x

   */

     jobject pt = env->CallObjectMethod(fontStrike,

                                        sunFontIDs.getGlyphPointMID,

                                        glyph, pointNumber);

     if (pt != NULL) {

       /* point is a java.awt.geom.Point2D.Float */

        point.fX = env->GetFloatField(pt, sunFontIDs.xFID);

        /* convert from java coordinate system to internal '+y up' coordinate system */

        point.fY = -env->GetFloatField(pt, sunFontIDs.yFID);

        return true;

     } else {

        return false;

     }

}

void FontInstanceAdapter::transformFunits(float xFunits, float yFunits, LEPoint &pixels) const

{

    float xx, xy, yx, yy;

    le_bool isIdentityMatrix;

    isIdentityMatrix = (txMat[0] == 1 && txMat[1] == 0 &&

                        txMat[2] == 0 && txMat[3] == 1);

    xx = xFunits * xScaleUnitsToPoints;

    xy = 0;

    if (!isIdentityMatrix) {

        xy = xx * txMat[1];

        xx = xx * txMat[0];

    };

    yx = 0;

    yy = yFunits * yScaleUnitsToPoints;

    if (!isIdentityMatrix) {

        yx = yy * txMat[2];

        yy = yy * txMat[3];

    };

    pixels.fX = xx + yx;

    pixels.fY = xy + yy;

}

float FontInstanceAdapter::euclidianDistance(float a, float b)

{

    if (a < 0) {

        a = -a;

    }

    if (b < 0) {

        b = -b;

    }

    if (a == 0) {

        return b;

    }

    if (b == 0) {

        return a;

    }

    float root = a > b ? a + (b / 2) : b + (a / 2); /* Do an initial approximation, in root */

        /* An unrolled Newton-Raphson iteration sequence */

    root = (root + (a * (a / root)) + (b * (b / root)) + 1) / 2;

    root = (root + (a * (a / root)) + (b * (b / root)) + 1) / 2;

    root = (root + (a * (a / root)) + (b * (b / root)) + 1) / 2;

    return root;

}