isle-portable/LEGO1/mxvideopresenter.cpp

#include "mxvideopresenter.h"
#include "mxvideomanager.h"

DECOMP_SIZE_ASSERT(MxVideoPresenter, 0x64);
DECOMP_SIZE_ASSERT(MxVideoPresenter::AlphaMask, 0xc);

// OFFSET: LEGO1 0x1000c700
void MxVideoPresenter::VTable0x5c(undefined4 p_unknown1)
{
  // Empty
}

// OFFSET: LEGO1 0x1000c710
void MxVideoPresenter::VTable0x60()
{
  // Empty
}

// OFFSET: LEGO1 0x1000c720
void MxVideoPresenter::VTable0x68(undefined4 p_unknown1)
{
  // Empty
}

// OFFSET: LEGO1 0x1000c730
void MxVideoPresenter::VTable0x70()
{
  // Empty
}

// OFFSET: LEGO1 0x1000c740
MxVideoPresenter::~MxVideoPresenter()
{
  Destroy(TRUE);
}

// OFFSET: LEGO1 0x1000c7a0
void MxVideoPresenter::Destroy()
{
  Destroy(FALSE);
}

// OFFSET: LEGO1 0x1000c7b0
LPDIRECTDRAWSURFACE MxVideoPresenter::VTable0x78()
{
  return m_unk58;
}

// OFFSET: LEGO1 0x1000c7c0
MxBool MxVideoPresenter::VTable0x7c()
{
  return (m_bitmap != NULL) || (m_alpha != NULL);
}

// OFFSET: LEGO1 0x1000c7e0
MxS32 MxVideoPresenter::GetWidth()
{
  return m_alpha ? m_alpha->m_width
                 : m_bitmap->GetBmiHeader()->biWidth;
}

// OFFSET: LEGO1 0x1000c800
MxS32 MxVideoPresenter::GetHeight()
{
  return m_alpha ? m_alpha->m_height
                 : m_bitmap->GetBmiHeader()->biHeight;
}

// OFFSET: LEGO1 0x100b24f0
MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap &p_bitmap)
{
  m_width  = p_bitmap.GetBmiWidth();
  // DECOMP: ECX becomes word-sized if these are not two separate actions.
  MxLong _height = p_bitmap.GetBmiHeightAbs();
  m_height = _height;

  MxS32 size = ((m_width * m_height) / 8) + 1;
  m_bitmask = new MxU8[size];
  memset(m_bitmask, 0, size);

  MxU32 biCompression = p_bitmap.GetBmiHeader()->biCompression;
  MxU32 rows_before_top;
  MxU8 *bitmap_src_ptr;

  // The goal here is to enable us to walk through the bitmap's rows
  // in order, regardless of the orientation. We want to end up at the
  // start of the first row, which is either at position 0, or at
  // (image_stride * biHeight) - 1.

  // Reminder: Negative biHeight means this is a top-down DIB.
  // Otherwise it is bottom-up.

  if (biCompression == BI_RGB) {
    // DECOMP: I think this must be an OR. If not, the check for
    // biCompression == 16 gets optimized away.
    if (biCompression == BI_RGB_TOPDOWN || p_bitmap.GetBmiHeight() < 0) {
      rows_before_top = 0;
    } else {
      rows_before_top = p_bitmap.GetBmiHeightAbs();
      rows_before_top--;
    }

    goto seek_to_last_row;
  } else if (biCompression == BI_RGB_TOPDOWN) {
    // DECOMP: This is the only condition where we skip the
    // calculation below.
    bitmap_src_ptr = p_bitmap.GetBitmapData();
  } else {
    if (p_bitmap.GetBmiHeight() < 0) {
      rows_before_top = 0;
    } else {
      rows_before_top = p_bitmap.GetBmiHeightAbs();
      rows_before_top--;
    }

// TODO: would prefer not to use goto if we can figure this structure out
seek_to_last_row:
    bitmap_src_ptr = ((p_bitmap.GetBmiWidth()+3)&-4) * rows_before_top + p_bitmap.GetBitmapData();
  }

  // How many bytes are there for each row of the bitmap?
  // (i.e. the image stride)
  // If this is a bottom-up DIB, we will walk it in reverse.
  // TODO: Same rounding trick as in MxBitmap
  MxS32 row_seek = ((m_height+3)&-4);
  if (p_bitmap.GetBmiHeight() < 0)
    row_seek = -row_seek;

  // The actual offset into the m_bitmask array. The two for-loops
  // are just for counting the pixels.
  MxS32 offset = 0;

  MxU8 *t_ptr = bitmap_src_ptr;
  for (MxS32 j = 0; j < m_height; j++) {
    for (MxS32 i = 0; i < m_width; i++) {
      if (*t_ptr) {
        // TODO: Second CDQ instruction for abs() should not be there.
        MxU32 shift = abs(offset) & 7;
        m_bitmask[offset / 8] |= (1 << abs((MxS32)shift));
      }
      t_ptr++;
      offset++;
    }
    // Seek to the start of the next row
    bitmap_src_ptr += row_seek;
    t_ptr = bitmap_src_ptr;
  }
}

// OFFSET: LEGO1 0x100b2670
MxVideoPresenter::AlphaMask::AlphaMask(const MxVideoPresenter::AlphaMask &p_alpha)
{
  m_width  = p_alpha.m_width;
  m_height = p_alpha.m_height;

  MxS32 size = ((m_width * m_height) / 8) + 1;
  m_bitmask = new MxU8[size];
  memcpy(m_bitmask, p_alpha.m_bitmask, size);
}


// OFFSET: LEGO1 0x100b26d0
MxVideoPresenter::AlphaMask::~AlphaMask()
{
  if (m_bitmask)
    delete[] m_bitmask;
}

// OFFSET: LEGO1 0x100b2760
void MxVideoPresenter::Init()
{
  m_bitmap = NULL;
  m_alpha = NULL;
  m_unk5c = 1;
  m_unk58 = NULL;
  m_unk60 = -1;
  m_flags = m_flags & 0xfe;

  if (MVideoManager() != NULL) {
    MVideoManager();
    m_flags = m_flags | 2;
    m_flags = m_flags & 0xfb;
  }

  m_flags = m_flags & 0xf7;
  m_flags = m_flags & 0xef;
}

// OFFSET: LEGO1 0x100b27b0
void MxVideoPresenter::Destroy(MxBool p_fromDestructor)
{
  if (MVideoManager() != NULL)
    MVideoManager()->RemovePresenter(*this);

  if (m_unk58) {
    m_unk58->Release();
    m_unk58 = NULL;
    m_flags = m_flags & 0xfd;
    m_flags = m_flags & 0xfb;
  }

  if (MVideoManager() && (m_alpha || m_bitmap)) {
    MxS32 height = GetHeight();
    MxS32 width = GetWidth();

    MxS32 x = GetLocationX();
    MxS32 y = GetLocationY();
    MxRect32 rect(x, y, x + width, y + height);

    MVideoManager()->InvalidateRect(rect);
    MVideoManager()->vtable0x34(rect.m_left, rect.m_top, rect.GetWidth(), rect.GetHeight());
  }

  delete m_bitmap;
  delete m_alpha;

  Init();

  if (!p_fromDestructor)
    MxMediaPresenter::Destroy(FALSE);
}

// OFFSET: LEGO1 0x100b28b0 STUB
void MxVideoPresenter::VTable0x64()
{
  // TODO
}

// OFFSET: LEGO1 0x100b2a70 STUB
void MxVideoPresenter::VTable0x6c()
{
  // TODO
}

// OFFSET: LEGO1 0x100b3300
undefined MxVideoPresenter::VTable0x74()
{
  return 0;
}