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- Add a proper Alpha blending implementation for 16bpp surfaces
CORE-8695

svn path=/trunk/; revision=64953
This commit is contained in:
Jérôme Gardou 2014-10-24 11:34:45 +00:00
parent 2b44442ffa
commit 7540c2ea36
3 changed files with 133 additions and 1 deletions
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2
reactos/win32ss/gdi/dib/dib.c
View file

@ -47,7 +47,7 @@ DIB_FUNCTIONS DibFunctionsForBitmapFormat[] =
{
DIB_16BPP_PutPixel, DIB_16BPP_GetPixel, DIB_16BPP_HLine, DIB_16BPP_VLine,
DIB_16BPP_BitBlt, DIB_16BPP_BitBltSrcCopy, DIB_XXBPP_StretchBlt,
DIB_16BPP_TransparentBlt, DIB_16BPP_ColorFill, DIB_XXBPP_AlphaBlend
DIB_16BPP_TransparentBlt, DIB_16BPP_ColorFill, DIB_16BPP_AlphaBlend
},
/* BMF_24BPP */
{

1
reactos/win32ss/gdi/dib/dib.h
View file

@ -101,6 +101,7 @@ BOOLEAN DIB_16BPP_BitBlt(PBLTINFO);
BOOLEAN DIB_16BPP_BitBltSrcCopy(PBLTINFO);
BOOLEAN DIB_16BPP_TransparentBlt(SURFOBJ*,SURFOBJ*,RECTL*,RECTL*,XLATEOBJ*,ULONG);
BOOLEAN DIB_16BPP_ColorFill(SURFOBJ*, RECTL*, ULONG);
BOOLEAN DIB_16BPP_AlphaBlend(SURFOBJ*, SURFOBJ*, RECTL*, RECTL*, CLIPOBJ*, XLATEOBJ*, BLENDOBJ*);
VOID DIB_24BPP_PutPixel(SURFOBJ*,LONG,LONG,ULONG);
ULONG DIB_24BPP_GetPixel(SURFOBJ*,LONG,LONG);

131
reactos/win32ss/gdi/dib/dib16bpp.c
View file

@ -525,4 +525,135 @@ DIB_16BPP_TransparentBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
return TRUE;
}
typedef union
{
ULONG ul;
struct
{
UCHAR red;
UCHAR green;
UCHAR blue;
UCHAR alpha;
} col;
} NICEPIXEL32;
typedef union
{
USHORT us;
struct
{
USHORT red :5;
USHORT green :6;
USHORT blue :5;
} col;
} NICEPIXEL16;
static __inline UCHAR
Clamp6(ULONG val)
{
return (val > 63) ? 63 : (UCHAR)val;
}
static __inline UCHAR
Clamp5(ULONG val)
{
return (val > 31) ? 31 : (UCHAR)val;
}
BOOLEAN
DIB_16BPP_AlphaBlend(SURFOBJ* Dest, SURFOBJ* Source, RECTL* DestRect,
RECTL* SourceRect, CLIPOBJ* ClipRegion,
XLATEOBJ* ColorTranslation, BLENDOBJ* BlendObj)
{
INT DstX, DstY, SrcX, SrcY;
BLENDFUNCTION BlendFunc;
NICEPIXEL32 SrcPixel32;
NICEPIXEL16 DstPixel16;
UCHAR Alpha, Alpha6, Alpha5;
EXLATEOBJ* pexlo;
EXLATEOBJ exloSrcRGB;
DPRINT("DIB_16BPP_AlphaBlend: srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom,
DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
BlendFunc = BlendObj->BlendFunction;
if (BlendFunc.BlendOp != AC_SRC_OVER)
{
DPRINT1("BlendOp != AC_SRC_OVER\n");
return FALSE;
}
if (BlendFunc.BlendFlags != 0)
{
DPRINT1("BlendFlags != 0\n");
return FALSE;
}
if ((BlendFunc.AlphaFormat & ~AC_SRC_ALPHA) != 0)
{
DPRINT1("Unsupported AlphaFormat (0x%x)\n", BlendFunc.AlphaFormat);
return FALSE;
}
if ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0 &&
(BitsPerFormat(Source->iBitmapFormat) != 32))
{
DPRINT1("Source bitmap must be 32bpp when AC_SRC_ALPHA is set\n");
return FALSE;
}
if (!ColorTranslation)
{
DPRINT1("ColorTranslation must not be NULL!\n");
return FALSE;
}
pexlo = CONTAINING_RECORD(ColorTranslation, EXLATEOBJ, xlo);
EXLATEOBJ_vInitialize(&exloSrcRGB, pexlo->ppalSrc, &gpalRGB, 0, 0, 0);
SrcY = SourceRect->top;
DstY = DestRect->top;
while ( DstY < DestRect->bottom )
{
SrcX = SourceRect->left;
DstX = DestRect->left;
while(DstX < DestRect->right)
{
SrcPixel32.ul = DIB_GetSource(Source, SrcX, SrcY, &exloSrcRGB.xlo);
SrcPixel32.col.red = (SrcPixel32.col.red * BlendFunc.SourceConstantAlpha) / 255;
SrcPixel32.col.green = (SrcPixel32.col.green * BlendFunc.SourceConstantAlpha) / 255;
SrcPixel32.col.blue = (SrcPixel32.col.blue * BlendFunc.SourceConstantAlpha) / 255;
Alpha = ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0) ?
(SrcPixel32.col.alpha * BlendFunc.SourceConstantAlpha) / 255 :
BlendFunc.SourceConstantAlpha;
Alpha6 = Alpha >> 2;
Alpha5 = Alpha >> 3;
DstPixel16.us = DIB_16BPP_GetPixel(Dest, DstX, DstY) & 0xFFFF;
/* Perform bit loss */
SrcPixel32.col.red >>= 3;
SrcPixel32.col.green >>= 2;
SrcPixel32.col.blue >>= 3;
/* Do the blend in the right bit depth */
DstPixel16.col.red = Clamp5((DstPixel16.col.red * (31 - Alpha5)) / 31 + SrcPixel32.col.red);
DstPixel16.col.green = Clamp6((DstPixel16.col.green * (63 - Alpha6)) / 63 + SrcPixel32.col.green);
DstPixel16.col.blue = Clamp5((DstPixel16.col.blue * (31 - Alpha5)) / 31 + SrcPixel32.col.blue);
DIB_16BPP_PutPixel(Dest, DstX, DstY, DstPixel16.us);
DstX++;
SrcX = SourceRect->left + ((DstX-DestRect->left)*(SourceRect->right - SourceRect->left))
/(DestRect->right-DestRect->left);
}
DstY++;
SrcY = SourceRect->top + ((DstY-DestRect->top)*(SourceRect->bottom - SourceRect->top))
/(DestRect->bottom-DestRect->top);
}
EXLATEOBJ_vCleanup(&exloSrcRGB);
return TRUE;
}
/* EOF */