mirror of
https://github.com/reactos/reactos.git
synced 2024-07-03 03:04:22 +00:00
414 lines
9.9 KiB
C
414 lines
9.9 KiB
C
#include "precomp.h"
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/* GLOBALS ********************************************************************/
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UCHAR VidpTextColor = 0x0F;
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ULONG VidpCurrentX = 0;
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ULONG VidpCurrentY = 0;
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ULONG VidpScrollRegion[4] =
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{
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0,
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0,
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SCREEN_WIDTH - 1,
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SCREEN_HEIGHT - 1
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};
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/* PRIVATE FUNCTIONS **********************************************************/
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static VOID
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NTAPI
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BitBlt(
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_In_ ULONG Left,
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_In_ ULONG Top,
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_In_ ULONG Width,
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_In_ ULONG Height,
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_In_ PUCHAR Buffer,
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_In_ ULONG BitsPerPixel,
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_In_ ULONG Delta)
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{
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ULONG sx, dx, dy;
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UCHAR color;
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ULONG offset = 0;
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const ULONG Bottom = Top + Height;
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const ULONG Right = Left + Width;
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/* Check if the buffer isn't 4bpp */
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if (BitsPerPixel != 4)
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{
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/* FIXME: TODO */
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DbgPrint("Unhandled BitBlt\n"
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"%lux%lu @ (%lu|%lu)\n"
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"Bits Per Pixel %lu\n"
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"Buffer: %p. Delta: %lu\n",
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Width,
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Height,
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Left,
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Top,
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BitsPerPixel,
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Buffer,
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Delta);
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return;
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}
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PrepareForSetPixel();
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/* 4bpp blitting */
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for (dy = Top; dy < Bottom; ++dy)
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{
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sx = 0;
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do
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{
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/* Extract color */
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color = Buffer[offset + sx];
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/* Calc destination x */
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dx = Left + (sx << 1);
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/* Set two pixels */
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SetPixel(dx, dy, color >> 4);
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SetPixel(dx + 1, dy, color & 0x0F);
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sx++;
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} while (dx < Right);
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offset += Delta;
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}
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}
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static VOID
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NTAPI
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RleBitBlt(
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_In_ ULONG Left,
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_In_ ULONG Top,
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_In_ ULONG Width,
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_In_ ULONG Height,
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_In_ PUCHAR Buffer)
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{
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ULONG YDelta;
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ULONG x;
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ULONG RleValue, NewRleValue;
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ULONG Color, Color2;
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ULONG i, j;
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ULONG Code;
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PrepareForSetPixel();
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/* Set Y height and current X value and start loop */
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YDelta = Top + Height - 1;
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x = Left;
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for (;;)
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{
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/* Get the current value and advance in the buffer */
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RleValue = *Buffer;
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Buffer++;
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if (RleValue)
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{
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/* Check if we've gone past the edge */
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if ((x + RleValue) > (Width + Left))
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{
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/* Fixup the pixel value */
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RleValue = Left - x + Width;
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}
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/* Get the new value */
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NewRleValue = *Buffer;
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/* Get the two colors */
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Color = NewRleValue >> 4;
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Color2 = NewRleValue & 0xF;
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/* Increase buffer position */
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Buffer++;
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/* Check if we need to do a fill */
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if (Color == Color2)
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{
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/* Do a fill and continue the loop */
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RleValue += x;
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VidSolidColorFill(x, YDelta, RleValue - 1, YDelta, (UCHAR)Color);
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x = RleValue;
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continue;
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}
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/* Check if the pixel value is 1 or below */
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if (RleValue > 1)
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{
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/* Set loop variables */
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for (i = (RleValue - 2) / 2 + 1; i > 0; --i)
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{
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/* Set the pixels */
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SetPixel(x, YDelta, (UCHAR)Color);
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x++;
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SetPixel(x, YDelta, (UCHAR)Color2);
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x++;
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/* Decrease pixel value */
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RleValue -= 2;
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}
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}
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/* Check if there is any value at all */
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if (RleValue)
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{
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/* Set the pixel and increase position */
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SetPixel(x, YDelta, (UCHAR)Color);
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x++;
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}
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/* Start over */
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continue;
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}
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/* Get the current pixel value */
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RleValue = *Buffer;
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Code = RleValue;
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switch (Code)
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{
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/* Case 0 */
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case 0:
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{
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/* Set new x value, decrease distance and restart */
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x = Left;
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YDelta--;
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Buffer++;
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continue;
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}
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/* Case 1 */
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case 1:
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{
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/* Done */
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return;
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}
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/* Case 2 */
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case 2:
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{
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/* Set new x value, decrease distance and restart */
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Buffer++;
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x += *Buffer;
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Buffer++;
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YDelta -= *Buffer;
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Buffer++;
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continue;
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}
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/* Other values */
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default:
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{
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Buffer++;
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break;
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}
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}
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/* Check if we've gone past the edge */
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if ((x + RleValue) > (Width + Left))
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{
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/* Set fixed up loop count */
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i = RleValue - Left - Width + x;
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/* Fixup pixel value */
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RleValue -= i;
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}
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else
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{
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/* Clear loop count */
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i = 0;
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}
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/* Check the value now */
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if (RleValue > 1)
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{
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/* Set loop variables */
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for (j = (RleValue - 2) / 2 + 1; j > 0; --j)
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{
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/* Get the new value */
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NewRleValue = *Buffer;
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/* Get the two colors */
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Color = NewRleValue >> 4;
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Color2 = NewRleValue & 0xF;
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/* Increase buffer position */
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Buffer++;
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/* Set the pixels */
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SetPixel(x, YDelta, (UCHAR)Color);
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x++;
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SetPixel(x, YDelta, (UCHAR)Color2);
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x++;
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/* Decrease pixel value */
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RleValue -= 2;
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}
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}
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/* Check if there is any value at all */
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if (RleValue)
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{
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/* Set the pixel and increase position */
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Color = *Buffer >> 4;
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Buffer++;
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SetPixel(x, YDelta, (UCHAR)Color);
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x++;
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i--;
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}
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/* Check loop count now */
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if ((LONG)i > 0)
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{
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/* Decrease it */
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i--;
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/* Set new position */
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Buffer = Buffer + (i / 2) + 1;
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}
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/* Check if we need to increase the buffer */
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if ((ULONG_PTR)Buffer & 1) Buffer++;
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}
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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VOID
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NTAPI
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VidDisplayStringXY(
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_In_ PUCHAR String,
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_In_ ULONG Left,
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_In_ ULONG Top,
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_In_ BOOLEAN Transparent)
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{
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ULONG BackColor;
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/*
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* If the caller wanted transparent, then send the special value (16),
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* else use our default and call the helper routine.
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*/
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BackColor = Transparent ? 16 : 14;
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/* Loop every character and adjust the position */
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for (; *String; ++String, Left += 8)
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{
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/* Display a character */
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DisplayCharacter(*String, Left, Top, 12, BackColor);
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}
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}
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VOID
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NTAPI
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VidSetScrollRegion(
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_In_ ULONG Left,
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_In_ ULONG Top,
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_In_ ULONG Right,
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_In_ ULONG Bottom)
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{
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/* Assert alignment */
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ASSERT((Left & 0x7) == 0);
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ASSERT((Right & 0x7) == 7);
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/* Set Scroll Region */
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VidpScrollRegion[0] = Left;
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VidpScrollRegion[1] = Top;
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VidpScrollRegion[2] = Right;
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VidpScrollRegion[3] = Bottom;
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/* Set current X and Y */
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VidpCurrentX = Left;
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VidpCurrentY = Top;
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}
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VOID
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NTAPI
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VidBufferToScreenBlt(
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_In_ PUCHAR Buffer,
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_In_ ULONG Left,
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_In_ ULONG Top,
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_In_ ULONG Width,
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_In_ ULONG Height,
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_In_ ULONG Delta)
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{
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/* Make sure we have a width and height */
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if (!Width || !Height)
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return;
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/* Call the helper function */
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BitBlt(Left, Top, Width, Height, Buffer, 4, Delta);
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}
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VOID
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NTAPI
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VidBitBlt(
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_In_ PUCHAR Buffer,
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_In_ ULONG Left,
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_In_ ULONG Top)
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{
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PBITMAPINFOHEADER BitmapInfoHeader;
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LONG Delta;
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PUCHAR BitmapOffset;
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/* Get the Bitmap Header */
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BitmapInfoHeader = (PBITMAPINFOHEADER)Buffer;
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/* Initialize the palette */
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InitPaletteWithTable((PULONG)(Buffer + BitmapInfoHeader->biSize),
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(BitmapInfoHeader->biClrUsed) ?
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BitmapInfoHeader->biClrUsed : 16);
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/* Make sure we can support this bitmap */
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ASSERT((BitmapInfoHeader->biBitCount * BitmapInfoHeader->biPlanes) <= 4);
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/*
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* Calculate the delta and align it on 32-bytes, then calculate
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* the actual start of the bitmap data.
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*/
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Delta = (BitmapInfoHeader->biBitCount * BitmapInfoHeader->biWidth) + 31;
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Delta >>= 3;
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Delta &= ~3;
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BitmapOffset = Buffer + sizeof(BITMAPINFOHEADER) + 16 * sizeof(ULONG);
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/* Check the compression of the bitmap */
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if (BitmapInfoHeader->biCompression == BI_RLE4)
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{
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/* Make sure we have a width and a height */
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if ((BitmapInfoHeader->biWidth) && (BitmapInfoHeader->biHeight))
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{
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/* We can use RLE Bit Blt */
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RleBitBlt(Left,
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Top,
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BitmapInfoHeader->biWidth,
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BitmapInfoHeader->biHeight,
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BitmapOffset);
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}
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}
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else
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{
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/* Check if the height is negative */
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if (BitmapInfoHeader->biHeight < 0)
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{
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/* Make it positive in the header */
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BitmapInfoHeader->biHeight *= -1;
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}
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else
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{
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/* Update buffer offset */
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BitmapOffset += ((BitmapInfoHeader->biHeight - 1) * Delta);
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Delta *= -1;
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}
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/* Make sure we have a width and a height */
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if ((BitmapInfoHeader->biWidth) && (BitmapInfoHeader->biHeight))
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{
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/* Do the BitBlt */
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BitBlt(Left,
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Top,
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BitmapInfoHeader->biWidth,
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BitmapInfoHeader->biHeight,
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BitmapOffset,
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BitmapInfoHeader->biBitCount,
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Delta);
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}
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}
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}
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