forked from xt-sys/exectos
126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/hl/efifb.c
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* DESCRIPTION: EFI framebuffer support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Clears the screen by drawing a filled black box.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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HlClearScreen(VOID)
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{
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SIZE_T Line, PositionX, PositionY;
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PULONG FrameBuf;
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/* Get pointer to frame buffer */
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FrameBuf = HlpFrameBufferData.Address;
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/* Fill the screen with a black box */
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for(PositionY = 0; PositionY < HlpFrameBufferData.Height; PositionY++)
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{
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Line = PositionY * HlpFrameBufferData.PixelsPerScanLine;
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for(PositionX = 0; PositionX < HlpFrameBufferData.Width; PositionX++)
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{
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FrameBuf[Line + PositionX] = 0x00000000;
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}
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}
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}
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/**
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* Draw a pixel on the screen at the given position and color.
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*
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* @param PositionX
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* Supplies the X coordinate of the pixel.
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*
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* @param PositionY
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* Supplies the Y coordinate of the pixel.
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*
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* @param Color
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* Specifies the color of the pixel.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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HlDrawPixel(IN ULONG PositionX,
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IN ULONG PositionY,
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IN ULONG Color)
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{
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SIZE_T FrameBufferIndex;
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/* Make sure frame buffer is already initialized */
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if(HlpFrameBufferData.Initialized == FALSE)
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{
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/* Unable to operate on non-initialized frame buffer */
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return;
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}
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/* Make sure point is not offscreen */
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if(PositionX >= HlpFrameBufferData.Width || PositionY >= HlpFrameBufferData.Height || Color > 0xFFFFFFFF)
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{
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/* Invalid pixel position or color given */
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return;
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}
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/* Calculate the index of the pixel in the frame buffer memory using the provided x and y coordinates */
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FrameBufferIndex = 4 * HlpFrameBufferData.PixelsPerScanLine * PositionY + 4 * PositionX;
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/* Set the color of the pixel by writing to the corresponding memory location */
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*((PULONG)(HlpFrameBufferData.Address + FrameBufferIndex)) = Color;
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}
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/**
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* Initializes frame buffer display.
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*
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* @return This routine returns a status code.
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*
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* @since XT 1.0
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*/
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XTAPI
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XTSTATUS
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HlInitializeFrameBuffer(VOID)
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{
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/* Check if display already initialized */
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if(HlpFrameBufferData.Initialized)
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{
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/* Nothing to do */
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return STATUS_SUCCESS;
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}
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/* Check if framebuffer initialized by bootloader */
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if(!KeInitializationBlock->LoaderInformation.FrameBuffer.Initialized ||
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!KeInitializationBlock->LoaderInformation.FrameBuffer.Address)
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{
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/* Display not initialized */
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return STATUS_DEVICE_NOT_READY;
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}
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/* Save framebuffer information and mark display as initialized */
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HlpFrameBufferData.Address = KeInitializationBlock->LoaderInformation.FrameBuffer.Address;
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HlpFrameBufferData.Width = KeInitializationBlock->LoaderInformation.FrameBuffer.Width;
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HlpFrameBufferData.Height = KeInitializationBlock->LoaderInformation.FrameBuffer.Height;
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HlpFrameBufferData.BitsPerPixel = KeInitializationBlock->LoaderInformation.FrameBuffer.BitsPerPixel;
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HlpFrameBufferData.PixelsPerScanLine = KeInitializationBlock->LoaderInformation.FrameBuffer.PixelsPerScanLine;
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HlpFrameBufferData.Pitch = KeInitializationBlock->LoaderInformation.FrameBuffer.Pitch;
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HlpFrameBufferData.Initialized = TRUE;
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/* Clear screen */
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HlClearScreen();
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/* Return success */
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return STATUS_SUCCESS;
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}
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