/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * GDI Bitmap Functions

 *

 * Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 * Copyright 2016 Armin Novak <armin.novak@thincast.com>

 * Copyright 2016 Thincast Technologies GmbH

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <freerdp/config.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <freerdp/api.h>

#include <freerdp/freerdp.h>

#include <freerdp/gdi/gdi.h>

#include <freerdp/codec/color.h>

#include <freerdp/gdi/region.h>

#include <freerdp/gdi/bitmap.h>

#include <freerdp/log.h>

#include <freerdp/gdi/shape.h>

#include "brush.h"

#include "clipping.h"

#include "../gdi/gdi.h"

#define TAG FREERDP_TAG("gdi.bitmap")

/**

 * Get pixel at the given coordinates. msdn{dd144909}

 * @param hdc device context

 * @param nXPos pixel x position

 * @param nYPos pixel y position

 * @return pixel color

 */

UINT32 gdi_GetPixel(HGDI_DC hdc, UINT32 nXPos, UINT32 nYPos)

{

  HGDI_BITMAP hBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdc->selectedObject);

  BYTE* data =

      &(hBmp->data[(nYPos * hBmp->scanline) + nXPos * FreeRDPGetBytesPerPixel(hBmp->format)]);

  return FreeRDPReadColor(data, hBmp->format);

}

BYTE* gdi_GetPointer(HGDI_BITMAP hBmp, UINT32 X, UINT32 Y)

{

  UINT32 bpp = FreeRDPGetBytesPerPixel(hBmp->format);

  return &hBmp->data[(Y * WINPR_ASSERTING_INT_CAST(uint32_t, hBmp->width) * bpp) + X * bpp];

}

/**

 * Set pixel at the given coordinates. msdn{dd145078}

 *

 * @param hBmp device context

 * @param X pixel x position

 * @param Y pixel y position

 * @param crColor new pixel color

 * @return the color written

 */

static inline UINT32 gdi_SetPixelBmp(HGDI_BITMAP hBmp, UINT32 X, UINT32 Y, UINT32 crColor)

{

  BYTE* p = &hBmp->data[(Y * hBmp->scanline) + X * FreeRDPGetBytesPerPixel(hBmp->format)];

  FreeRDPWriteColor(p, hBmp->format, crColor);

  return crColor;

}

UINT32 gdi_SetPixel(HGDI_DC hdc, UINT32 X, UINT32 Y, UINT32 crColor)

{

  HGDI_BITMAP hBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdc->selectedObject);

  return gdi_SetPixelBmp(hBmp, X, Y, crColor);

}

/**

 * Create a new bitmap with the given width, height, color format and pixel buffer. msdn{dd183485}

 *

 * @param nWidth width

 * @param nHeight height

 * @param format the color format used

 * @param data pixel buffer

 * @return new bitmap

 */

HGDI_BITMAP gdi_CreateBitmap(UINT32 nWidth, UINT32 nHeight, UINT32 format, BYTE* data)

{

  return gdi_CreateBitmapEx(nWidth, nHeight, format, 0, data, winpr_aligned_free);

}

/**

 * Create a new bitmap with the given width, height, color format and pixel buffer. msdn{dd183485}

 *

 * @param nWidth width

 * @param nHeight height

 * @param format the color format used

 * @param data pixel buffer

 * @param fkt_free The function used for deallocation of the buffer, nullptr for none.

 * @return new bitmap

 */

HGDI_BITMAP gdi_CreateBitmapEx(UINT32 nWidth, UINT32 nHeight, UINT32 format, UINT32 stride,

                               BYTE* data, void (*fkt_free)(void*))

{

  HGDI_BITMAP hBitmap = (HGDI_BITMAP)calloc(1, sizeof(GDI_BITMAP));

  if (!hBitmap)

    return nullptr;

  hBitmap->objectType = GDIOBJECT_BITMAP;

  hBitmap->format = format;

  if (stride > 0)

    hBitmap->scanline = stride;

  else

    hBitmap->scanline = nWidth * FreeRDPGetBytesPerPixel(hBitmap->format);

  hBitmap->width = WINPR_ASSERTING_INT_CAST(int, nWidth);

  hBitmap->height = WINPR_ASSERTING_INT_CAST(int, nHeight);

  hBitmap->data = data;

  hBitmap->free = fkt_free;

  return hBitmap;

}

/**

 * Create a new bitmap of the given width and height compatible with the current device context.

 * msdn{dd183488}

 *

 * @param hdc device context

 * @param nWidth width

 * @param nHeight height

 *

 * @return new bitmap

 */

HGDI_BITMAP gdi_CreateCompatibleBitmap(HGDI_DC hdc, UINT32 nWidth, UINT32 nHeight)

{

  HGDI_BITMAP hBitmap = (HGDI_BITMAP)calloc(1, sizeof(GDI_BITMAP));

  if (!hBitmap)

    return nullptr;

  hBitmap->objectType = GDIOBJECT_BITMAP;

  hBitmap->format = hdc->format;

  WINPR_ASSERT(nWidth <= INT32_MAX);

  hBitmap->width = (INT32)nWidth;

  WINPR_ASSERT(nHeight <= INT32_MAX);

  hBitmap->height = (INT32)nHeight;

  size_t size = 1ull * nWidth * nHeight * FreeRDPGetBytesPerPixel(hBitmap->format);

  hBitmap->data =

      winpr_aligned_calloc(1ull * nWidth * FreeRDPGetBytesPerPixel(hBitmap->format), nHeight, 16);

  hBitmap->free = winpr_aligned_free;

  if (!hBitmap->data)

  {

    free(hBitmap);

    return nullptr;

  }

  /* Initialize with 0xff */

  memset(hBitmap->data, 0xff, size);

  hBitmap->scanline = nWidth * FreeRDPGetBytesPerPixel(hBitmap->format);

  return hBitmap;

}

static BOOL op_not(UINT32* stack, const UINT32* stackp)

{

  if (!stack || !stackp)

    return FALSE;

  if (*stackp < 1)

    return FALSE;

  stack[(*stackp) - 1] = ~stack[(*stackp) - 1];

  return TRUE;

}

static BOOL op_and(UINT32* stack, UINT32* stackp)

{

  if (!stack || !stackp)

    return FALSE;

  if (*stackp < 2)

    return FALSE;

  (*stackp)--;

  stack[(*stackp) - 1] &= stack[(*stackp)];

  return TRUE;

}

static BOOL op_or(UINT32* stack, UINT32* stackp)

{

  if (!stack || !stackp)

    return FALSE;

  if (*stackp < 2)

    return FALSE;

  (*stackp)--;

  stack[(*stackp) - 1] |= stack[(*stackp)];

  return TRUE;

}

static BOOL op_xor(UINT32* stack, UINT32* stackp)

{

  if (!stack || !stackp)

    return FALSE;

  if (*stackp < 2)

    return FALSE;

  (*stackp)--;

  stack[(*stackp) - 1] ^= stack[(*stackp)];

  return TRUE;

}

static UINT32 process_rop(UINT32 src, UINT32 dst, UINT32 pat, const char* rop, UINT32 format)

{

  UINT32 stack[10] = WINPR_C_ARRAY_INIT;

  UINT32 stackp = 0;

  while (*rop != '\0')

  {

    char op = *rop++;

    switch (op)

    {

      case '0':

        stack[stackp++] = FreeRDPGetColor(format, 0, 0, 0, 0xFF);

        break;

      case '1':

        stack[stackp++] = FreeRDPGetColor(format, 0xFF, 0xFF, 0xFF, 0xFF);

        break;

      case 'D':

        stack[stackp++] = dst;

        break;

      case 'S':

        stack[stackp++] = src;

        break;

      case 'P':

        stack[stackp++] = pat;

        break;

      case 'x':

        op_xor(stack, &stackp);

        break;

      case 'a':

        op_and(stack, &stackp);

        break;

      case 'o':

        op_or(stack, &stackp);

        break;

      case 'n':

        op_not(stack, &stackp);

        break;

      default:

        break;

    }

  }

  return stack[0];

}

static inline BOOL BitBlt_write(HGDI_DC hdcDest, HGDI_DC hdcSrc, INT32 nXDest, INT32 nYDest,

                                INT32 nXSrc, INT32 nYSrc, INT32 x, INT32 y, BOOL useSrc,

                                BOOL usePat, UINT32 style, const char* rop,

                                const gdiPalette* palette)

{

  UINT32 dstColor = 0;

  UINT32 colorA = 0;

  UINT32 colorB = 0;

  UINT32 colorC = 0;

  const INT32 dstX = nXDest + x;

  const INT32 dstY = nYDest + y;

  BYTE* dstp = gdi_get_bitmap_pointer(hdcDest, dstX, dstY);

  if (!dstp)

  {

    WLog_ERR(TAG, "dstp=%p", (const void*)dstp);

    return FALSE;

  }

  colorA = FreeRDPReadColor(dstp, hdcDest->format);

  if (useSrc)

  {

    const BYTE* srcp = gdi_get_bitmap_pointer(hdcSrc, nXSrc + x, nYSrc + y);

    if (!srcp)

    {

      WLog_ERR(TAG, "srcp=%p", (const void*)srcp);

      return FALSE;

    }

    colorC = FreeRDPReadColor(srcp, hdcSrc->format);

    colorC = FreeRDPConvertColor(colorC, hdcSrc->format, hdcDest->format, palette);

  }

  if (usePat)

  {

    switch (style)

    {

      case GDI_BS_SOLID:

        colorB = hdcDest->brush->color;

        break;

      case GDI_BS_HATCHED:

      case GDI_BS_PATTERN:

      {

        const BYTE* patp =

            gdi_get_brush_pointer(hdcDest, WINPR_ASSERTING_INT_CAST(uint32_t, nXDest + x),

                                  WINPR_ASSERTING_INT_CAST(uint32_t, nYDest + y));

        if (!patp)

        {

          WLog_ERR(TAG, "patp=%p", (const void*)patp);

          return FALSE;

        }

        colorB = FreeRDPReadColor(patp, hdcDest->format);

      }

      break;

      default:

        break;

    }

  }

  dstColor = process_rop(colorC, colorA, colorB, rop, hdcDest->format);

  return FreeRDPWriteColor(dstp, hdcDest->format, dstColor);

}

static BOOL adjust_src_coordinates(HGDI_DC hdcSrc, INT32 nWidth, INT32 nHeight, INT32* px,

                                   INT32* py)

{

  HGDI_BITMAP hSrcBmp = nullptr;

  INT32 nXSrc = 0;

  INT32 nYSrc = 0;

  if (!hdcSrc || (nWidth < 0) || (nHeight < 0) || !px || !py)

    return FALSE;

  hSrcBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcSrc->selectedObject);

  nXSrc = *px;

  nYSrc = *py;

  if (!hSrcBmp)

    return FALSE;

  if (nYSrc < 0)

  {

    nYSrc = 0;

    nHeight = nHeight + nYSrc;

  }

  if ((nXSrc) < 0)

  {

    nXSrc = 0;

    nWidth = nWidth + nXSrc;

  }

  if (hSrcBmp->width < (nXSrc + nWidth))

    nXSrc = hSrcBmp->width - nWidth;

  if (hSrcBmp->height < (nYSrc + nHeight))

    nYSrc = hSrcBmp->height - nHeight;

  if ((nXSrc < 0) || (nYSrc < 0))

    return FALSE;

  *px = nXSrc;

  *py = nYSrc;

  return TRUE;

}

static BOOL adjust_src_dst_coordinates(HGDI_DC hdcDest, INT32* pnXSrc, INT32* pnYSrc, INT32* pnXDst,

                                       INT32* pnYDst, INT32* pnWidth, INT32* pnHeight)

{

  HGDI_BITMAP hDstBmp = nullptr;

  volatile INT32 diffX = 0;

  volatile INT32 diffY = 0;

  volatile INT32 nXSrc = 0;

  volatile INT32 nYSrc = 0;

  volatile INT32 nXDst = 0;

  volatile INT32 nYDst = 0;

  volatile INT32 nWidth = 0;

  volatile INT32 nHeight = 0;

  if (!hdcDest || !pnXSrc || !pnYSrc || !pnXDst || !pnYDst || !pnWidth || !pnHeight)

    return FALSE;

  hDstBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcDest->selectedObject);

  nXSrc = *pnXSrc;

  nYSrc = *pnYSrc;

  nXDst = *pnXDst;

  nYDst = *pnYDst;

  nWidth = *pnWidth;

  nHeight = *pnHeight;

  if (!hDstBmp)

    return FALSE;

  if (nXDst < 0)

  {

    nXSrc -= nXDst;

    nWidth += nXDst;

    nXDst = 0;

  }

  if (nYDst < 0)

  {

    nYSrc -= nYDst;

    nHeight += nYDst;

    nYDst = 0;

  }

  diffX = hDstBmp->width - nXDst - nWidth;

  if (diffX < 0)

    nWidth += diffX;

  diffY = hDstBmp->height - nYDst - nHeight;

  if (diffY < 0)

    nHeight += diffY;

  if ((nXDst < 0) || (nYDst < 0) || (nWidth < 0) || (nHeight < 0))

  {

    nXDst = 0;

    nYDst = 0;

    nWidth = 0;

    nHeight = 0;

  }

  *pnXSrc = nXSrc;

  *pnYSrc = nYSrc;

  *pnXDst = nXDst;

  *pnYDst = nYDst;

  *pnWidth = nWidth;

  *pnHeight = nHeight;

  return TRUE;

}

static BOOL BitBlt_process(HGDI_DC hdcDest, INT32 nXDest, INT32 nYDest, INT32 nWidth, INT32 nHeight,

                           HGDI_DC hdcSrc, INT32 nXSrc, INT32 nYSrc, const char* rop,

                           const gdiPalette* palette)

{

  UINT32 style = 0;

  BOOL useSrc = FALSE;

  BOOL usePat = FALSE;

  const char* iter = rop;

  while (*iter != '\0')

  {

    switch (*iter++)

    {

      case 'P':

        usePat = TRUE;

        break;

      case 'S':

        useSrc = TRUE;

        break;

      default:

        break;

    }

  }

  if (!hdcDest)

    return FALSE;

  if (!adjust_src_dst_coordinates(hdcDest, &nXSrc, &nYSrc, &nXDest, &nYDest, &nWidth, &nHeight))

    return FALSE;

  if (useSrc && !hdcSrc)

    return FALSE;

  if (useSrc)

  {

    if (!adjust_src_coordinates(hdcSrc, nWidth, nHeight, &nXSrc, &nYSrc))

      return FALSE;

  }

  if (usePat)

  {

    style = gdi_GetBrushStyle(hdcDest);

    switch (style)

    {

      case GDI_BS_SOLID:

      case GDI_BS_HATCHED:

      case GDI_BS_PATTERN:

        break;

      default:

        WLog_ERR(TAG, "Invalid brush!!");

        return FALSE;

    }

  }

  if ((nXDest > nXSrc) && (nYDest > nYSrc))

  {

    for (INT32 y = nHeight - 1; y >= 0; y--)

    {

      for (INT32 x = nWidth - 1; x >= 0; x--)

      {

        if (!BitBlt_write(hdcDest, hdcSrc, nXDest, nYDest, nXSrc, nYSrc, x, y, useSrc,

                          usePat, style, rop, palette))

          return FALSE;

      }

    }

  }

  else if (nXDest > nXSrc)

  {

    for (INT32 y = 0; y < nHeight; y++)

    {

      for (INT32 x = nWidth - 1; x >= 0; x--)

      {

        if (!BitBlt_write(hdcDest, hdcSrc, nXDest, nYDest, nXSrc, nYSrc, x, y, useSrc,

                          usePat, style, rop, palette))

          return FALSE;

      }

    }

  }

  else if (nYDest > nYSrc)

  {

    for (INT32 y = nHeight - 1; y >= 0; y--)

    {

      for (INT32 x = 0; x < nWidth; x++)

      {

        if (!BitBlt_write(hdcDest, hdcSrc, nXDest, nYDest, nXSrc, nYSrc, x, y, useSrc,

                          usePat, style, rop, palette))

          return FALSE;

      }

    }

  }

  else

  {

    for (INT32 y = 0; y < nHeight; y++)

    {

      for (INT32 x = 0; x < nWidth; x++)

      {

        if (!BitBlt_write(hdcDest, hdcSrc, nXDest, nYDest, nXSrc, nYSrc, x, y, useSrc,

                          usePat, style, rop, palette))

          return FALSE;

      }

    }

  }

  return TRUE;

}

/**

 * Perform a bit blit operation on the given pixel buffers.

 * msdn{dd183370}

 *

 * @param hdcDest destination device context

 * @param nXDest destination x1

 * @param nYDest destination y1

 * @param nWidth width

 * @param nHeight height

 * @param hdcSrc source device context

 * @param nXSrc source x1

 * @param nYSrc source y1

 * @param rop raster operation code

 * @return 0 on failure, non-zero otherwise

 */

BOOL gdi_BitBlt(HGDI_DC hdcDest, INT32 nXDest, INT32 nYDest, INT32 nWidth, INT32 nHeight,

                HGDI_DC hdcSrc, INT32 nXSrc, INT32 nYSrc, DWORD rop, const gdiPalette* palette)

{

  HGDI_BITMAP hSrcBmp = nullptr;

  HGDI_BITMAP hDstBmp = nullptr;

  if (!hdcDest)

    return FALSE;

  if (!gdi_ClipCoords(hdcDest, &nXDest, &nYDest, &nWidth, &nHeight, &nXSrc, &nYSrc))

    return TRUE;

  /* Check which ROP should be performed.

   * Some specific ROP are used heavily and are resource intensive,

   * add optimized versions for these here.

   *

   * For all others fall back to the generic implementation.

   */

  switch (rop)

  {

    case GDI_SRCCOPY:

      if (!hdcSrc)

        return FALSE;

      if (!adjust_src_dst_coordinates(hdcDest, &nXSrc, &nYSrc, &nXDest, &nYDest, &nWidth,

                                      &nHeight))

        return FALSE;

      if (!adjust_src_coordinates(hdcSrc, nWidth, nHeight, &nXSrc, &nYSrc))

        return FALSE;

      hSrcBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcSrc->selectedObject);

      hDstBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcDest->selectedObject);

      if (!hSrcBmp || !hDstBmp)

        return FALSE;

      if (!freerdp_image_copy(

              hDstBmp->data, hDstBmp->format, hDstBmp->scanline,

              WINPR_ASSERTING_INT_CAST(UINT32, nXDest),

              WINPR_ASSERTING_INT_CAST(UINT32, nYDest),

              WINPR_ASSERTING_INT_CAST(UINT32, nWidth),

              WINPR_ASSERTING_INT_CAST(UINT32, nHeight), hSrcBmp->data, hSrcBmp->format,

              hSrcBmp->scanline, WINPR_ASSERTING_INT_CAST(UINT32, nXSrc),

              WINPR_ASSERTING_INT_CAST(UINT32, nYSrc), palette, FREERDP_FLIP_NONE))

        return FALSE;

      break;

    case GDI_DSTCOPY:

      hSrcBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcDest->selectedObject);

      hDstBmp = WINPR_PACKED_ALIGN_CAST(HGDI_BITMAP, hdcDest->selectedObject);

      if (!adjust_src_dst_coordinates(hdcDest, &nXSrc, &nYSrc, &nXDest, &nYDest, &nWidth,

                                      &nHeight))

        return FALSE;

      if (!adjust_src_coordinates(hdcDest, nWidth, nHeight, &nXSrc, &nYSrc))

        return FALSE;

      if (!hSrcBmp || !hDstBmp)

        return FALSE;

      if (!freerdp_image_copy(

              hDstBmp->data, hDstBmp->format, hDstBmp->scanline,

              WINPR_ASSERTING_INT_CAST(UINT32, nXDest),

              WINPR_ASSERTING_INT_CAST(UINT32, nYDest),

              WINPR_ASSERTING_INT_CAST(UINT32, nWidth),

              WINPR_ASSERTING_INT_CAST(UINT32, nHeight), hSrcBmp->data, hSrcBmp->format,

              hSrcBmp->scanline, WINPR_ASSERTING_INT_CAST(UINT32, nXSrc),

              WINPR_ASSERTING_INT_CAST(UINT32, nYSrc), palette, FREERDP_FLIP_NONE))

        return FALSE;

      break;

    default:

      if (!BitBlt_process(hdcDest, nXDest, nYDest, nWidth, nHeight, hdcSrc, nXSrc, nYSrc,

                          gdi_rop_to_string(rop), palette))

        return FALSE;

      break;

  }

  return gdi_InvalidateRegion(hdcDest, nXDest, nYDest, nWidth, nHeight);

}