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Fix AlphaMask functions (#1425)

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MS 2025-04-03 20:18:00 -04:00 committed by GitHub
parent 3b63506648
commit 93d6c18c9a
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2 changed files with 8 additions and 39 deletions
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4
LEGO1/omni/include/mxbitmap.h
View File

@ -115,7 +115,7 @@ public:
MxLong GetDataSize() const { return AlignToFourByte(m_bmiHeader->biWidth) * GetBmiHeightAbs(); }
// FUNCTION: BETA10 0x1002c4b0
MxBool IsTopDown()
MxBool IsTopDown() const
{
if (m_bmiHeader->biCompression == BI_RGB_TOPDOWN) {
return TRUE;
@ -130,7 +130,7 @@ public:
: -p_bitmap->AlignToFourByte(p_bitmap->GetBmiWidth()))
// FUNCTION: BETA10 0x1002c320
MxU8* GetStart(MxS32 p_left, MxS32 p_top)
MxU8* GetStart(MxS32 p_left, MxS32 p_top) const
{
if (m_bmiHeader->biCompression == BI_RGB) {
return m_data + p_left +

43
LEGO1/omni/src/video/mxvideopresenter.cpp
View File

@ -15,17 +15,12 @@ DECOMP_SIZE_ASSERT(MxVideoPresenter::AlphaMask, 0x0c);
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;
m_height = p_bitmap.GetBmiHeightAbs();
MxS32 size = ((m_width * m_height) / 8) + 1;
m_bitmask = new MxU8[size];
memset(m_bitmask, 0, size);
MxU32 rowsBeforeTop;
MxU8* bitmapSrcPtr;
// 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
@ -34,37 +29,13 @@ MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap& p_bitmap)
// Reminder: Negative biHeight means this is a top-down DIB.
// Otherwise it is bottom-up.
switch (p_bitmap.GetBmiHeader()->biCompression) {
case BI_RGB: {
if (p_bitmap.GetBmiHeight() < 0) {
rowsBeforeTop = 0;
}
else {
rowsBeforeTop = p_bitmap.GetBmiHeightAbs() - 1;
}
bitmapSrcPtr = p_bitmap.GetImage() + (p_bitmap.GetBmiStride() * rowsBeforeTop);
break;
}
case BI_RGB_TOPDOWN:
bitmapSrcPtr = p_bitmap.GetImage();
break;
default: {
if (p_bitmap.GetBmiHeight() < 0) {
rowsBeforeTop = 0;
}
else {
rowsBeforeTop = p_bitmap.GetBmiHeightAbs() - 1;
}
bitmapSrcPtr = p_bitmap.GetImage() + (p_bitmap.GetBmiStride() * rowsBeforeTop);
}
}
MxU8* bitmapSrcPtr = p_bitmap.GetStart(0, 0);
// 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 rowSeek = ((m_width + 3) & -4);
if (p_bitmap.GetBmiHeader()->biCompression != BI_RGB_TOPDOWN && p_bitmap.GetBmiHeight() > 0) {
MxS32 rowSeek = p_bitmap.AlignToFourByte(m_width);
if (p_bitmap.GetBmiHeader()->biCompression != BI_RGB_TOPDOWN && p_bitmap.GetBmiHeight() >= 0) {
rowSeek = -rowSeek;
}
@ -76,9 +47,7 @@ MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap& p_bitmap)
MxU8* tPtr = bitmapSrcPtr;
for (MxS32 i = 0; i < m_width; i++) {
if (*tPtr) {
// TODO: Second CDQ instruction for abs() should not be there.
MxU32 shift = abs(offset) & 7;
m_bitmask[offset / 8] |= (1 << abs((MxS32) shift));
m_bitmask[offset / 8] |= (1 << (offset % 8));
}
tPtr++;
offset++;
@ -116,7 +85,7 @@ MxS32 MxVideoPresenter::AlphaMask::IsHit(MxU32 p_x, MxU32 p_y)
}
MxS32 pos = p_y * m_width + p_x;
return m_bitmask[pos / 8] & (1 << abs(abs(pos) & 7)) ? 1 : 0;
return m_bitmask[pos / 8] & (1 << (pos % 8)) ? 1 : 0;
}
// FUNCTION: LEGO1 0x100b2760