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Update mxvideopresenter.cpp (#429)

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Misha
2024-01-13 09:32:45 -05:00
committed by GitHub
parent d24f5db42f
commit d5d4a8b0ff
1 changed files with 17 additions and 29 deletions
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44
LEGO1/omni/src/video/mxvideopresenter.cpp
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@@ -20,7 +20,6 @@ MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap& p_bitmap)
m_bitmask = new MxU8[size];
memset(m_bitmask, 0, size);
MxU32 biCompression = p_bitmap.GetBmiHeader()->biCompression;
MxU32 rowsBeforeTop;
MxU8* bitmapSrcPtr;
@@ -32,36 +31,25 @@ MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap& p_bitmap)
// 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) {
switch (p_bitmap.GetBmiHeader()->biCompression) {
case BI_RGB: {
if (p_bitmap.GetBmiHeight() < 0)
rowsBeforeTop = 0;
else
rowsBeforeTop = p_bitmap.GetBmiHeightAbs() - 1;
bitmapSrcPtr = p_bitmap.GetBitmapData() + (p_bitmap.GetBmiStride() * rowsBeforeTop);
break;
}
else {
rowsBeforeTop = p_bitmap.GetBmiHeightAbs();
rowsBeforeTop--;
}
goto seek_to_last_row;
}
else if (biCompression == BI_RGB_TOPDOWN) {
// DECOMP: This is the only condition where we skip the
// calculation below.
case BI_RGB_TOPDOWN:
bitmapSrcPtr = p_bitmap.GetBitmapData();
}
else {
if (p_bitmap.GetBmiHeight() < 0) {
break;
default: {
if (p_bitmap.GetBmiHeight() < 0)
rowsBeforeTop = 0;
else
rowsBeforeTop = p_bitmap.GetBmiHeightAbs() - 1;
bitmapSrcPtr = p_bitmap.GetBitmapData() + (p_bitmap.GetBmiStride() * rowsBeforeTop);
}
else {
rowsBeforeTop = p_bitmap.GetBmiHeightAbs();
rowsBeforeTop--;
}
// TODO: would prefer not to use goto if we can figure this structure out
seek_to_last_row:
bitmapSrcPtr = p_bitmap.GetBmiStride() * rowsBeforeTop + p_bitmap.GetBitmapData();
}
// How many bytes are there for each row of the bitmap?
@@ -69,15 +57,15 @@ MxVideoPresenter::AlphaMask::AlphaMask(const MxBitmap& p_bitmap)
// 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.GetBmiHeight() < 0)
if (p_bitmap.GetBmiHeader()->biCompression != 16 && p_bitmap.GetBmiHeight() > 0)
rowSeek = -rowSeek;
// The actual offset into the m_bitmask array. The two for-loops
// are just for counting the pixels.
MxS32 offset = 0;
MxU8* tPtr = bitmapSrcPtr;
for (MxS32 j = 0; j < m_height; j++) {
MxU8* tPtr = bitmapSrcPtr;
for (MxS32 i = 0; i < m_width; i++) {
if (*tPtr) {
// TODO: Second CDQ instruction for abs() should not be there.