149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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foncache.c
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Abstract:
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This is the console fullscreen driver for the VGA card.
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Environment:
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kernel mode only
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Notes:
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Revision History:
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--*/
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#include "fsvga.h"
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#define ADD_IMAGE 1
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#define REPLACE_IMAGE 2
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#define CALC_BITMAP_BITS_FOR_X( FontSizeX, dwAlign ) \
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( ( ( FontSizeX * BITMAP_BITS_PIXEL + (dwAlign-1) ) & ~(dwAlign-1)) >> BITMAP_ARRAY_BYTE )
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ULONG
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CalcBitmapBufferSize(
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IN COORD FontSize,
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IN ULONG dwAlign
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)
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{
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ULONG uiCount;
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uiCount = CALC_BITMAP_BITS_FOR_X(FontSize.X,
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(dwAlign==BYTE_ALIGN ? BITMAP_BITS_BYTE_ALIGN : BITMAP_BITS_WORD_ALIGN));
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uiCount = uiCount * BITMAP_PLANES * FontSize.Y;
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return uiCount;
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}
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VOID
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AlignCopyMemory(
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OUT PUCHAR pDestBits,
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IN ULONG dwDestAlign,
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IN PUCHAR pSrcBits,
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IN ULONG dwSrcAlign,
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IN COORD FontSize
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)
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{
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ULONG dwDestBufferSize;
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COORD coord;
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try
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{
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if (dwDestAlign == dwSrcAlign) {
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dwDestBufferSize = CalcBitmapBufferSize(FontSize, dwDestAlign);
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RtlCopyMemory(pDestBits, pSrcBits, dwDestBufferSize);
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return;
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}
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switch (dwDestAlign) {
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default:
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case WORD_ALIGN:
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switch (dwSrcAlign) {
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default:
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//
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// pDest = WORD, pSrc = WORD
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//
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case WORD_ALIGN:
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dwDestBufferSize = CalcBitmapBufferSize(FontSize, dwDestAlign);
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RtlCopyMemory(pDestBits, pSrcBits, dwDestBufferSize);
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break;
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//
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// pDest = WORD, pSrc = BYTE
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//
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case BYTE_ALIGN:
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dwDestBufferSize = CalcBitmapBufferSize(FontSize, dwDestAlign);
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if (((FontSize.X % BITMAP_BITS_BYTE_ALIGN) == 0) &&
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((FontSize.X % BITMAP_BITS_WORD_ALIGN) == 0) ) {
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RtlCopyMemory(pDestBits, pSrcBits, dwDestBufferSize);
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}
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else {
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RtlZeroMemory(pDestBits, dwDestBufferSize);
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for (coord.Y=0; coord.Y < FontSize.Y; coord.Y++) {
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for (coord.X=0;
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coord.X < CALC_BITMAP_BITS_FOR_X(FontSize.X, BITMAP_BITS_BYTE_ALIGN);
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coord.X++) {
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*pDestBits++ = *pSrcBits++;
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}
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if (CALC_BITMAP_BITS_FOR_X(FontSize.X, BITMAP_BITS_BYTE_ALIGN) & 1)
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pDestBits++;
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}
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}
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break;
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}
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break;
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case BYTE_ALIGN:
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switch (dwSrcAlign) {
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//
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// pDest = BYTE, pSrc = BYTE
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//
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case BYTE_ALIGN:
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dwDestBufferSize = CalcBitmapBufferSize(FontSize, dwDestAlign);
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RtlCopyMemory(pDestBits, pSrcBits, dwDestBufferSize);
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break;
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default:
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//
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// pDest = BYTE, pSrc = WORD
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//
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case WORD_ALIGN:
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dwDestBufferSize = CalcBitmapBufferSize(FontSize, dwDestAlign);
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if (((FontSize.X % BITMAP_BITS_BYTE_ALIGN) == 0) &&
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((FontSize.X % BITMAP_BITS_WORD_ALIGN) == 0) ) {
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RtlCopyMemory(pDestBits, pSrcBits, dwDestBufferSize);
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}
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else {
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RtlZeroMemory(pDestBits, dwDestBufferSize);
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for (coord.Y=0; coord.Y < FontSize.Y; coord.Y++) {
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for (coord.X=0;
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coord.X < CALC_BITMAP_BITS_FOR_X(FontSize.X, BITMAP_BITS_BYTE_ALIGN);
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coord.X++) {
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*pDestBits++ = *pSrcBits++;
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}
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if (CALC_BITMAP_BITS_FOR_X(FontSize.X, BITMAP_BITS_BYTE_ALIGN) & 1)
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pSrcBits++;
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}
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}
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break;
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}
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break;
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}
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}
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except (EXCEPTION_EXECUTE_HANDLER)
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{
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}
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}
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