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124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/*
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* PROJECT: Win32 subsystem
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* LICENSE: See COPYING in the top level directory
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* FILE: win32ss/gdi/dib/alphablend.c
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* PURPOSE: AlphaBlend implementation suitable for all bit depths
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* PROGRAMMERS: Jérôme Gardou
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*/
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#include <win32k.h>
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#define NDEBUG
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#include <debug.h>
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typedef union
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{
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ULONG ul;
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struct
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{
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UCHAR red;
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UCHAR green;
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UCHAR blue;
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UCHAR alpha;
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} col;
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} NICEPIXEL32;
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static __inline UCHAR
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Clamp8(ULONG val)
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{
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return (val > 255) ? 255 : (UCHAR)val;
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}
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BOOLEAN
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DIB_XXBPP_AlphaBlend(SURFOBJ* Dest, SURFOBJ* Source, RECTL* DestRect,
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RECTL* SourceRect, CLIPOBJ* ClipRegion,
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XLATEOBJ* ColorTranslation, BLENDOBJ* BlendObj)
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{
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INT DstX, DstY, SrcX, SrcY;
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BLENDFUNCTION BlendFunc;
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register NICEPIXEL32 DstPixel32;
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register NICEPIXEL32 SrcPixel32;
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UCHAR Alpha, SrcBpp = BitsPerFormat(Source->iBitmapFormat);
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EXLATEOBJ* pexlo;
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EXLATEOBJ exloSrcRGB, exloDstRGB, exloRGBSrc;
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PFN_DIB_PutPixel pfnDibPutPixel = DibFunctionsForBitmapFormat[Dest->iBitmapFormat].DIB_PutPixel;
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DPRINT("DIB_16BPP_AlphaBlend: srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
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SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom,
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DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
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BlendFunc = BlendObj->BlendFunction;
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if (BlendFunc.BlendOp != AC_SRC_OVER)
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{
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DPRINT1("BlendOp != AC_SRC_OVER\n");
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return FALSE;
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}
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if (BlendFunc.BlendFlags != 0)
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{
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DPRINT1("BlendFlags != 0\n");
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return FALSE;
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}
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if ((BlendFunc.AlphaFormat & ~AC_SRC_ALPHA) != 0)
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{
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DPRINT1("Unsupported AlphaFormat (0x%x)\n", BlendFunc.AlphaFormat);
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return FALSE;
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}
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if ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0 &&
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SrcBpp != 32)
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{
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DPRINT1("Source bitmap must be 32bpp when AC_SRC_ALPHA is set\n");
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return FALSE;
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}
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if (!ColorTranslation)
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{
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DPRINT1("ColorTranslation must not be NULL!\n");
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return FALSE;
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}
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pexlo = CONTAINING_RECORD(ColorTranslation, EXLATEOBJ, xlo);
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EXLATEOBJ_vInitialize(&exloSrcRGB, pexlo->ppalSrc, &gpalRGB, 0, 0, 0);
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EXLATEOBJ_vInitialize(&exloDstRGB, pexlo->ppalDst, &gpalRGB, 0, 0, 0);
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EXLATEOBJ_vInitialize(&exloRGBSrc, &gpalRGB, pexlo->ppalSrc, 0, 0, 0);
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SrcY = SourceRect->top;
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DstY = DestRect->top;
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while ( DstY < DestRect->bottom )
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{
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SrcX = SourceRect->left;
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DstX = DestRect->left;
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while(DstX < DestRect->right)
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{
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SrcPixel32.ul = DIB_GetSource(Source, SrcX, SrcY, &exloSrcRGB.xlo);
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SrcPixel32.col.red = (SrcPixel32.col.red * BlendFunc.SourceConstantAlpha) / 255;
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SrcPixel32.col.green = (SrcPixel32.col.green * BlendFunc.SourceConstantAlpha) / 255;
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SrcPixel32.col.blue = (SrcPixel32.col.blue * BlendFunc.SourceConstantAlpha) / 255;
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Alpha = ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0) ?
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(SrcPixel32.col.alpha * BlendFunc.SourceConstantAlpha) / 255 :
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BlendFunc.SourceConstantAlpha ;
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DstPixel32.ul = DIB_GetSource(Dest, DstX, DstY, &exloDstRGB.xlo);
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DstPixel32.col.red = Clamp8((DstPixel32.col.red * (255 - Alpha)) / 255 + SrcPixel32.col.red) ;
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DstPixel32.col.green = Clamp8((DstPixel32.col.green * (255 - Alpha)) / 255 + SrcPixel32.col.green) ;
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DstPixel32.col.blue = Clamp8((DstPixel32.col.blue * (255 - Alpha)) / 255 + SrcPixel32.col.blue) ;
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DstPixel32.ul = XLATEOBJ_iXlate(&exloRGBSrc.xlo, DstPixel32.ul);
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pfnDibPutPixel(Dest, DstX, DstY, XLATEOBJ_iXlate(ColorTranslation, DstPixel32.ul));
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DstX++;
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SrcX = SourceRect->left + ((DstX-DestRect->left)*(SourceRect->right - SourceRect->left))
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/(DestRect->right-DestRect->left);
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}
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DstY++;
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SrcY = SourceRect->top + ((DstY-DestRect->top)*(SourceRect->bottom - SourceRect->top))
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/(DestRect->bottom-DestRect->top);
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}
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EXLATEOBJ_vCleanup(&exloDstRGB);
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EXLATEOBJ_vCleanup(&exloRGBSrc);
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EXLATEOBJ_vCleanup(&exloSrcRGB);
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return TRUE;
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}
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