/*

 * 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

 * published by the Free Software Foundation.  Oracle designates this

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

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 *  DESCRIPTION

 *    Calculates cliping boundary for Affine functions.

 *

 */

#include "mlib_image.h"

#include "mlib_SysMath.h"

#include "mlib_ImageAffine.h"

/***************************************************************/

mlib_status mlib_AffineEdges(mlib_affine_param *param,

                             const mlib_image  *dst,

                             const mlib_image  *src,

                             void              *buff_lcl,

                             mlib_s32          buff_size,

                             mlib_s32          kw,

                             mlib_s32          kh,

                             mlib_s32          kw1,

                             mlib_s32          kh1,

                             mlib_edge         edge,

                             const mlib_d64    *mtx,

                             mlib_s32          shiftx,

                             mlib_s32          shifty)

{

  mlib_u8 *buff = buff_lcl;

  mlib_u8 **lineAddr = param->lineAddr;

  mlib_s32 srcWidth, dstWidth, srcHeight, dstHeight, srcYStride, dstYStride;

  mlib_s32 *leftEdges, *rightEdges, *xStarts, *yStarts, bsize0, bsize1 = 0;

  mlib_u8 *srcData, *dstData;

  mlib_u8 *paddings;

  void *warp_tbl = NULL;

  mlib_s32 yStart = 0, yFinish = -1, dX, dY;

  mlib_d64 xClip, yClip, wClip, hClip;

  mlib_d64 delta = 0.;

  mlib_d64 minX, minY, maxX, maxY;

  mlib_d64 coords[4][2];

  mlib_d64 a = mtx[0], b = mtx[1], tx = mtx[2], c = mtx[3], d = mtx[4], ty = mtx[5];

  mlib_d64 a2, b2, tx2, c2, d2, ty2;

  mlib_d64 dx, dy, div;

  mlib_s32 sdx, sdy;

  mlib_d64 dTop;

  mlib_d64 val0;

  mlib_s32 top, bot;

  mlib_s32 topIdx, max_xsize = 0;

  mlib_s32 i, j, t;

  srcData = mlib_ImageGetData(src);

  dstData = mlib_ImageGetData(dst);

  srcWidth = mlib_ImageGetWidth(src);

  srcHeight = mlib_ImageGetHeight(src);

  dstWidth = mlib_ImageGetWidth(dst);

  dstHeight = mlib_ImageGetHeight(dst);

  srcYStride = mlib_ImageGetStride(src);

  dstYStride = mlib_ImageGetStride(dst);

  paddings = mlib_ImageGetPaddings(src);

  if (srcWidth >= (1 << 15) || srcHeight >= (1 << 15)) {

    return MLIB_FAILURE;

  }

  div = a * d - b * c;

  if (div == 0.0) {

    return MLIB_FAILURE;

  }

  bsize0 = (dstHeight * sizeof(mlib_s32) + 7) & ~7;

  if (lineAddr == NULL) {

    bsize1 = ((srcHeight + 4 * kh) * sizeof(mlib_u8 *) + 7) & ~7;

  }

  param->buff_malloc = NULL;

  if ((4 * bsize0 + bsize1) > buff_size) {

    buff = param->buff_malloc = mlib_malloc(4 * bsize0 + bsize1);

    if (buff == NULL)

      return MLIB_FAILURE;

  }

  leftEdges = (mlib_s32 *) (buff);

  rightEdges = (mlib_s32 *) (buff += bsize0);

  xStarts = (mlib_s32 *) (buff += bsize0);

  yStarts = (mlib_s32 *) (buff += bsize0);

  if (lineAddr == NULL) {

    mlib_u8 *srcLinePtr = srcData;

    lineAddr = (mlib_u8 **) (buff += bsize0);

    for (i = 0; i < 2 * kh; i++)

      lineAddr[i] = srcLinePtr;

    lineAddr += 2 * kh;

    for (i = 0; i < srcHeight - 1; i++) {

      lineAddr[i] = srcLinePtr;

      srcLinePtr += srcYStride;

    }

    for (i = srcHeight - 1; i < srcHeight + 2 * kh; i++)

      lineAddr[i] = srcLinePtr;

  }

  if ((mlib_s32) edge < 0) {                               /* process edges */

    minX = 0;

    minY = 0;

    maxX = srcWidth;

    maxY = srcHeight;

  }

  else {

    if (kw > 1)

      delta = -0.5;                                        /* for MLIB_NEAREST filter delta = 0. */

    minX = (kw1 - delta);

    minY = (kh1 - delta);

    maxX = srcWidth - ((kw - 1) - (kw1 - delta));

    maxY = srcHeight - ((kh - 1) - (kh1 - delta));

    if (edge == MLIB_EDGE_SRC_PADDED) {

      if (minX < paddings[0])

        minX = paddings[0];

      if (minY < paddings[1])

        minY = paddings[1];

      if (maxX > (srcWidth - paddings[2]))

        maxX = srcWidth - paddings[2];

      if (maxY > (srcHeight - paddings[3]))

        maxY = srcHeight - paddings[3];

    }

  }

  xClip = minX;

  yClip = minY;

  wClip = maxX;

  hClip = maxY;

/*

 *   STORE_PARAM(param, src);

 *   STORE_PARAM(param, dst);

 */

  param->src = (void *)src;

  param->dst = (void *)dst;

  STORE_PARAM(param, lineAddr);

  STORE_PARAM(param, dstData);

  STORE_PARAM(param, srcYStride);

  STORE_PARAM(param, dstYStride);

  STORE_PARAM(param, leftEdges);

  STORE_PARAM(param, rightEdges);

  STORE_PARAM(param, xStarts);

  STORE_PARAM(param, yStarts);

  STORE_PARAM(param, max_xsize);

  STORE_PARAM(param, yStart);

  STORE_PARAM(param, yFinish);

  STORE_PARAM(param, warp_tbl);

  if ((xClip >= wClip) || (yClip >= hClip)) {

    return MLIB_SUCCESS;

  }

  a2 = d;

  b2 = -b;

  tx2 = (-d * tx + b * ty);

  c2 = -c;

  d2 = a;

  ty2 = (c * tx - a * ty);

  dx = a2;

  dy = c2;

  tx -= 0.5;

  ty -= 0.5;

  coords[0][0] = xClip * a + yClip * b + tx;

  coords[0][1] = xClip * c + yClip * d + ty;

  coords[2][0] = wClip * a + hClip * b + tx;

  coords[2][1] = wClip * c + hClip * d + ty;

  if (div > 0) {

    coords[1][0] = wClip * a + yClip * b + tx;

    coords[1][1] = wClip * c + yClip * d + ty;

    coords[3][0] = xClip * a + hClip * b + tx;

    coords[3][1] = xClip * c + hClip * d + ty;

  }

  else {

    coords[3][0] = wClip * a + yClip * b + tx;

    coords[3][1] = wClip * c + yClip * d + ty;

    coords[1][0] = xClip * a + hClip * b + tx;

    coords[1][1] = xClip * c + hClip * d + ty;

  }

  topIdx = 0;

  for (i = 1; i < 4; i++) {

    if (coords[i][1] < coords[topIdx][1])

      topIdx = i;

  }

  dTop = coords[topIdx][1];

  val0 = dTop;

  SAT32(top);

  bot = -1;

  if (top >= dstHeight) {

    return MLIB_SUCCESS;

  }

  if (dTop >= 0.0) {

    mlib_d64 xLeft, xRight, x;

    mlib_s32 nextIdx;

    if (dTop == top) {

      xLeft = coords[topIdx][0];

      xRight = coords[topIdx][0];

      nextIdx = (topIdx + 1) & 0x3;

      if (dTop == coords[nextIdx][1]) {

        x = coords[nextIdx][0];

        xLeft = (xLeft <= x) ? xLeft : x;

        xRight = (xRight >= x) ? xRight : x;

      }

      nextIdx = (topIdx - 1) & 0x3;

      if (dTop == coords[nextIdx][1]) {

        x = coords[nextIdx][0];

        xLeft = (xLeft <= x) ? xLeft : x;

        xRight = (xRight >= x) ? xRight : x;

      }

      val0 = xLeft;

      SAT32(t);

      leftEdges[top] = (t >= xLeft) ? t : ++t;

      if (xLeft >= MLIB_S32_MAX)

        leftEdges[top] = MLIB_S32_MAX;

      val0 = xRight;

      SAT32(rightEdges[top]);

    }

    else

      top++;

  }

  else

    top = 0;

  for (i = 0; i < 2; i++) {

    mlib_d64 dY1 = coords[(topIdx - i) & 0x3][1];

    mlib_d64 dX1 = coords[(topIdx - i) & 0x3][0];

    mlib_d64 dY2 = coords[(topIdx - i - 1) & 0x3][1];

    mlib_d64 dX2 = coords[(topIdx - i - 1) & 0x3][0];

    mlib_d64 x = dX1, slope = (dX2 - dX1) / (dY2 - dY1);

    mlib_s32 y1;

    mlib_s32 y2;

    if (dY1 == dY2)

      continue;

    if (dY1 < 0.0)

      y1 = 0;

    else {

      val0 = dY1 + 1;

      SAT32(y1);

    }

    val0 = dY2;

    SAT32(y2);

    if (y2 >= dstHeight)

      y2 = (mlib_s32) (dstHeight - 1);

    x += slope * (y1 - dY1);

#ifdef __SUNPRO_C

#pragma pipeloop(0)

#endif /* __SUNPRO_C */

    for (j = y1; j <= y2; j++) {

      val0 = x;

      SAT32(t);

      leftEdges[j] = (t >= x) ? t : ++t;

      if (x >= MLIB_S32_MAX)

        leftEdges[j] = MLIB_S32_MAX;

      x += slope;

    }

  }

  for (i = 0; i < 2; i++) {

    mlib_d64 dY1 = coords[(topIdx + i) & 0x3][1];

    mlib_d64 dX1 = coords[(topIdx + i) & 0x3][0];

    mlib_d64 dY2 = coords[(topIdx + i + 1) & 0x3][1];

    mlib_d64 dX2 = coords[(topIdx + i + 1) & 0x3][0];

    mlib_d64 x = dX1, slope = (dX2 - dX1) / (dY2 - dY1);

    mlib_s32 y1;

    mlib_s32 y2;

    if (dY1 == dY2)

      continue;

    if (dY1 < 0.0)

      y1 = 0;

    else {

      val0 = dY1 + 1;

      SAT32(y1);

    }

    val0 = dY2;

    SAT32(y2);

    if (y2 >= dstHeight)

      y2 = (mlib_s32) (dstHeight - 1);

    x += slope * (y1 - dY1);

#ifdef __SUNPRO_C

#pragma pipeloop(0)

#endif /* __SUNPRO_C */

    for (j = y1; j <= y2; j++) {

      val0 = x;

      SAT32(rightEdges[j]);

      x += slope;

    }

    bot = y2;

  }

  {

    mlib_d64 dxCl = xClip * div;

    mlib_d64 dyCl = yClip * div;

    mlib_d64 dwCl = wClip * div;

    mlib_d64 dhCl = hClip * div;

    mlib_s32 xCl = (mlib_s32) (xClip + delta);

    mlib_s32 yCl = (mlib_s32) (yClip + delta);

    mlib_s32 wCl = (mlib_s32) (wClip + delta);

    mlib_s32 hCl = (mlib_s32) (hClip + delta);

    /*

     * mlib_s32 xCl = (mlib_s32)(xClip + delta);

     * mlib_s32 yCl = (mlib_s32)(yClip + delta);

     * mlib_s32 wCl = (mlib_s32)(wClip);

     * mlib_s32 hCl = (mlib_s32)(hClip);

     */

    if (edge == MLIB_EDGE_SRC_PADDED) {

      xCl = kw1;

      yCl = kh1;

      wCl = (mlib_s32) (srcWidth - ((kw - 1) - kw1));

      hCl = (mlib_s32) (srcHeight - ((kh - 1) - kh1));

    }

    div = 1.0 / div;

    sdx = (mlib_s32) (a2 * div * (1 << shiftx));

    sdy = (mlib_s32) (c2 * div * (1 << shifty));

    if (div > 0) {

#ifdef __SUNPRO_C

#pragma pipeloop(0)

#endif /* __SUNPRO_C */

      for (i = top; i <= bot; i++) {

        mlib_s32 xLeft = leftEdges[i];

        mlib_s32 xRight = rightEdges[i];

        mlib_s32 xs, ys, x_e, y_e, x_s, y_s;

        mlib_d64 dxs, dys, dxe, dye;

        mlib_d64 xl, ii, xr;

        xLeft = (xLeft < 0) ? 0 : xLeft;

        xRight = (xRight >= dstWidth) ? (mlib_s32) (dstWidth - 1) : xRight;

        xl = xLeft + 0.5;

        ii = i + 0.5;

        xr = xRight + 0.5;

        dxs = xl * a2 + ii * b2 + tx2;

        dys = xl * c2 + ii * d2 + ty2;

        if ((dxs < dxCl) || (dxs >= dwCl) || (dys < dyCl) || (dys >= dhCl)) {

          dxs += dx;

          dys += dy;

          xLeft++;

          if ((dxs < dxCl) || (dxs >= dwCl) || (dys < dyCl) || (dys >= dhCl))

            xRight = -1;

        }

        dxe = xr * a2 + ii * b2 + tx2;

        dye = xr * c2 + ii * d2 + ty2;

        if ((dxe < dxCl) || (dxe >= dwCl) || (dye < dyCl) || (dye >= dhCl)) {

          dxe -= dx;

          dye -= dy;

          xRight--;

          if ((dxe < dxCl) || (dxe >= dwCl) || (dye < dyCl) || (dye >= dhCl))

            xRight = -1;

        }

        xs = (mlib_s32) ((dxs * div + delta) * (1 << shiftx));

        x_s = xs >> shiftx;

        ys = (mlib_s32) ((dys * div + delta) * (1 << shifty));

        y_s = ys >> shifty;

        if (x_s < xCl)

          xs = (xCl << shiftx);

        else if (x_s >= wCl)

          xs = ((wCl << shiftx) - 1);

        if (y_s < yCl)

          ys = (yCl << shifty);

        else if (y_s >= hCl)

          ys = ((hCl << shifty) - 1);

        if (xRight >= xLeft) {

          x_e = ((xRight - xLeft) * sdx + xs) >> shiftx;

          y_e = ((xRight - xLeft) * sdy + ys) >> shifty;

          if ((x_e < xCl) || (x_e >= wCl)) {

            if (sdx > 0)

              sdx -= 1;

            else

              sdx += 1;

          }

          if ((y_e < yCl) || (y_e >= hCl)) {

            if (sdy > 0)

              sdy -= 1;

            else

              sdy += 1;

          }

        }

        leftEdges[i] = xLeft;

        rightEdges[i] = xRight;

        xStarts[i] = xs;

        yStarts[i] = ys;

        if ((xRight - xLeft + 1) > max_xsize)

          max_xsize = (xRight - xLeft + 1);

      }

    }

    else {

#ifdef __SUNPRO_C

#pragma pipeloop(0)

#endif /* __SUNPRO_C */

      for (i = top; i <= bot; i++) {

        mlib_s32 xLeft = leftEdges[i];

        mlib_s32 xRight = rightEdges[i];

        mlib_s32 xs, ys, x_e, y_e, x_s, y_s;

        mlib_d64 dxs, dys, dxe, dye;

        mlib_d64 xl, ii, xr;

        xLeft = (xLeft < 0) ? 0 : xLeft;

        xRight = (xRight >= dstWidth) ? (mlib_s32) (dstWidth - 1) : xRight;

        xl = xLeft + 0.5;

        ii = i + 0.5;

        xr = xRight + 0.5;

        dxs = xl * a2 + ii * b2 + tx2;

        dys = xl * c2 + ii * d2 + ty2;

        if ((dxs > dxCl) || (dxs <= dwCl) || (dys > dyCl) || (dys <= dhCl)) {

          dxs += dx;

          dys += dy;

          xLeft++;

          if ((dxs > dxCl) || (dxs <= dwCl) || (dys > dyCl) || (dys <= dhCl))

            xRight = -1;

        }

        dxe = xr * a2 + ii * b2 + tx2;

        dye = xr * c2 + ii * d2 + ty2;

        if ((dxe > dxCl) || (dxe <= dwCl) || (dye > dyCl) || (dye <= dhCl)) {

          dxe -= dx;

          dye -= dy;

          xRight--;