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80 lines
1.9 KiB
C
80 lines
1.9 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: subsystems/win32/win32k/dib/dib24bppc.c
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* PURPOSE: C language equivalents of asm optimised 24bpp functions
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* PROGRAMMERS: Jason Filby
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* Magnus Olsen
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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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VOID
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DIB_24BPP_HLine(SURFOBJ *SurfObj, LONG x1, LONG x2, LONG y, ULONG c)
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{
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PBYTE addr = (PBYTE)SurfObj->pvScan0 + y * SurfObj->lDelta + (x1 << 1) + x1;
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ULONG Count = x2 - x1;
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if (Count < 8)
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{
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/* For small fills, don't bother doing anything fancy */
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while (Count--)
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{
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*(PUSHORT)(addr) = c;
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addr += 2;
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*(addr) = c >> 16;
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addr += 1;
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}
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}
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else
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{
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ULONG Fill[3];
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ULONG MultiCount;
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/* Align to 4-byte address */
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while (0 != ((ULONG_PTR) addr & 0x3))
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{
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*(PUSHORT)(addr) = c;
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addr += 2;
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*(addr) = c >> 16;
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addr += 1;
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Count--;
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}
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/* If the color we need to fill with is 0ABC, then the final mem pattern
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* (note little-endianness) would be:
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*
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* |C.B.A|C.B.A|C.B.A|C.B.A| <- pixel borders
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* |C.B.A.C|B.A.C.B|A.C.B.A| <- ULONG borders
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*
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* So, taking endianness into account again, we need to fill with these
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* ULONGs: CABC BCAB ABCA */
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c = c & 0xffffff; /* 0ABC */
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Fill[0] = c | (c << 24); /* CABC */
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Fill[1] = (c >> 8) | (c << 16); /* BCAB */
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Fill[2] = (c << 8) | (c >> 16); /* ABCA */
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MultiCount = Count / 4;
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do
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{
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*(PULONG)addr = Fill[0];
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addr += 4;
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*(PULONG)addr = Fill[1];
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addr += 4;
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*(PULONG)addr = Fill[2];
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addr += 4;
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}
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while (0 != --MultiCount);
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Count = Count & 0x03;
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while (0 != Count--)
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{
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*(PUSHORT)(addr) = c;
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addr += 2;
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*(addr) = c >> 16;
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addr += 1;
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}
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}
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}
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