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Implement srcCopy|transparent transfer mode in CopyBits

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This commit is contained in:
Iliyas Jorio 2020-11-21 21:26:14 +01:00
parent b579625619
commit 16b087f329
1 changed files with 44 additions and 7 deletions
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37
src/Graphics/Graphics.cpp
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@ -77,8 +77,11 @@ struct GrafPortImpl
static std::unique_ptr<GrafPortImpl> screenPort = nullptr; static std::unique_ptr<GrafPortImpl> screenPort = nullptr;
static GrafPortImpl* curPort = nullptr; static GrafPortImpl* curPort = nullptr;
// Pen colors are stored as ARGB in the host's native endianness
static UInt32 penFG = 0xFF'FF'00'FF; static UInt32 penFG = 0xFF'FF'00'FF;
static UInt32 penBG = 0xFF'00'00'FF; static UInt32 penBG = 0xFF'00'00'FF;
static int penX = 0; static int penX = 0;
static int penY = 0; static int penY = 0;
@ -554,6 +557,9 @@ void CopyBits(
if (srcRectWidth != dstRectWidth || srcRectHeight != dstRectHeight) if (srcRectWidth != dstRectWidth || srcRectHeight != dstRectHeight)
TODOFATAL2("can only copy between rects of same dimensions"); TODOFATAL2("can only copy between rects of same dimensions");
switch (mode)
{
case srcCopy:
for (int y = 0; y < srcRectHeight; y++) for (int y = 0; y < srcRectHeight; y++)
{ {
memcpy( memcpy(
@ -562,6 +568,37 @@ void CopyBits(
4 * srcRectWidth 4 * srcRectWidth
); );
} }
break;
case srcCopy|transparent:
{
// Replaces the destination pixel with the source pixel
// if the source pixel is not equal to the background color.
UInt32 transparentColor = penBG;
ByteswapInts(sizeof(transparentColor), 1, &transparentColor); // need to byteswap because ARGBPixmap.GetPtr returns a pointer to raw (big-endian) ARGB ints
for (int y = 0; y < srcRectHeight; y++)
{
UInt32* dstPix = dstPM.GetPtr(dstRect->left - dstBounds.left, dstRect->top - dstBounds.top + y);
UInt32* srcPix = srcPM.GetPtr(srcRect->left - srcBounds.left, srcRect->top - srcBounds.top + y);
for (int x = 0; x < srcRectWidth; x++)
{
if (*srcPix != transparentColor)
{
*dstPix = *srcPix;
}
dstPix++;
srcPix++;
}
}
break;
}
default:
TODOFATAL2("unsupported CopyBits mode " << mode);
break;
}
curPort->DamageRegion(*dstRect); curPort->DamageRegion(*dstRect);
} }